Haydn: Part 1 (#2007)

* Haydn: Part 1

Based on my reverse of audio 11.0.0.

As always, core implementation under LGPLv3 for the same reasons as for Amadeus.

This place the bases of a more flexible audio system while making audout & audin accurate.

This have the following improvements:
- Complete reimplementation of audout and audin.
- Audin currently only have a dummy backend.
- Dramatically reduce CPU usage by up to 50% in common cases (SoundIO and OpenAL).
- Audio Renderer now can output to 5.1 devices when supported.
- Audio Renderer init its backend on demand instead of keeping two up all the time.
- All backends implementation are now in their own project.
- Ryujinx.Audio.Renderer was renamed Ryujinx.Audio and was refactored because of this.

As a note, games having issues with OpenAL haven't improved and will not
because of OpenAL design (stopping when buffers finish playing causing
possible audio "pops" when buffers are very small).

* Update for latest hexkyz's edits on Switchbrew

* audren: Rollback channel configuration changes

* Address gdkchan's comments

* Fix typo in OpenAL backend driver

* Address last comments

* Fix a nit

* Address gdkchan's comments

Ryujinx.Audio/AudioManager.cs

@@ -0,0 +1,137 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+using System.Threading;
+
+namespace Ryujinx.Audio
+{
+    /// <summary>
+    /// Manage audio input and output system.
+    /// </summary>
+    public class AudioManager : IDisposable
+    {
+        /// <summary>
+        /// Lock used to control the waiters registration.
+        /// </summary>
+        private object _lock = new object();
+
+        /// <summary>
+        /// Events signaled when the driver played audio buffers.
+        /// </summary>
+        private ManualResetEvent[] _updateRequiredEvents;
+
+        /// <summary>
+        /// Action to execute when the driver played audio buffers.
+        /// </summary>
+        private Action[] _actions;
+
+        /// <summary>
+        /// The worker thread in charge of handling sessions update.
+        /// </summary>
+        private Thread _workerThread;
+
+        /// <summary>
+        /// Create a new <see cref="AudioManager"/>.
+        /// </summary>
+        public AudioManager()
+        {
+            _updateRequiredEvents = new ManualResetEvent[2];
+            _actions = new Action[2];
+
+            // Termination event.
+            _updateRequiredEvents[1] = new ManualResetEvent(false);
+
+            _workerThread = new Thread(Update)
+            {
+                Name = "AudioManager.Worker"
+            };
+        }
+
+        /// <summary>
+        /// Start the <see cref="AudioManager"/>.
+        /// </summary>
+        public void Start()
+        {
+            if (_workerThread.IsAlive)
+            {
+                throw new InvalidOperationException();
+            }
+
+            _workerThread.Start();
+        }
+
+        /// <summary>
+        /// Initialize update handlers.
+        /// </summary>
+        /// <param name="updatedRequiredEvent ">The driver event that will get signaled by the device driver when an audio buffer finished playing/being captured</param>
+        /// <param name="outputCallback">The callback to call when an audio buffer finished playing</param>
+        /// <param name="inputCallback">The callback to call when an audio buffer was captured</param>
+        public void Initialize(ManualResetEvent updatedRequiredEvent, Action outputCallback, Action inputCallback)
+        {
+            lock (_lock)
+            {
+                _updateRequiredEvents[0] = updatedRequiredEvent;
+                _actions[0] = outputCallback;
+                _actions[1] = inputCallback;
+            }
+        }
+
+        /// <summary>
+        /// Entrypoint of the <see cref="_workerThread"/> in charge of updating the <see cref="AudioManager"/>.
+        /// </summary>
+        private void Update()
+        {
+            while (true)
+            {
+                int index = WaitHandle.WaitAny(_updateRequiredEvents);
+
+                // Last index is here to indicate thread termination.
+                if (index + 1 == _updateRequiredEvents.Length)
+                {
+                    break;
+                }
+
+                lock (_lock)
+                {
+                    foreach (Action action in _actions)
+                    {
+                        action?.Invoke();
+                    }
+
+                    _updateRequiredEvents[0].Reset();
+                }
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _updateRequiredEvents[1].Set();
+                _workerThread.Join();
+
+                _updateRequiredEvents[1].Dispose();
+            }
+        }
+    }
+}

Ryujinx.Audio/Backends/Common/BackendHelper.cs

@@ -0,0 +1,43 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using System;
+
+namespace Ryujinx.Audio.Backends.Common
+{
+    public static class BackendHelper
+    {
+        public static int GetSampleSize(SampleFormat format)
+        {
+            return format switch
+            {
+                SampleFormat.PcmInt8 => sizeof(byte),
+                SampleFormat.PcmInt16 => sizeof(ushort),
+                SampleFormat.PcmInt24 => 3,
+                SampleFormat.PcmInt32 => sizeof(int),
+                SampleFormat.PcmFloat => sizeof(float),
+                _ => throw new ArgumentException($"{format}"),
+            };
+        }
+
+        public static int GetSampleCount(SampleFormat format, int channelCount, int bufferSize)
+        {
+            return bufferSize / GetSampleSize(format) / channelCount;
+        }
+    }
+}

Ryujinx.Audio/Backends/Common/DynamicRingBuffer.cs

@@ -0,0 +1,183 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Common;
+using System;
+
+namespace Ryujinx.Audio.Backends.Common
+{
+    /// <summary>
+    /// A ring buffer that grow if data written to it is too big to fit.
+    /// </summary>
+    public class DynamicRingBuffer
+    {
+        private const int RingBufferAlignment = 2048;
+
+        private object _lock = new object();
+
+        private byte[] _buffer;
+        private int _size;
+        private int _headOffset;
+        private int _tailOffset;
+
+        public int Length => _size;
+
+        public DynamicRingBuffer(int initialCapacity = RingBufferAlignment)
+        {
+            _buffer = new byte[initialCapacity];
+        }
+
+        public void Clear()
+        {
+            _size = 0;
+            _headOffset = 0;
+            _tailOffset = 0;
+        }
+
+        public void Clear(int size)
+        {
+            lock (_lock)
+            {
+                if (size > _size)
+                {
+                    size = _size;
+                }
+
+                if (size == 0)
+                {
+                    return;
+                }
+
+                _headOffset = (_headOffset + size) % _buffer.Length;
+                _size -= size;
+
+                if (_size == 0)
+                {
+                    _headOffset = 0;
+                    _tailOffset = 0;
+                }
+            }
+        }
+
+        private void SetCapacityLocked(int capacity)
+        {
+            byte[] buffer = new byte[capacity];
+
+            if (_size > 0)
+            {
+                if (_headOffset < _tailOffset)
+                {
+                    Buffer.BlockCopy(_buffer, _headOffset, buffer, 0, _size);
+                }
+                else
+                {
+                    Buffer.BlockCopy(_buffer, _headOffset, buffer, 0, _buffer.Length - _headOffset);
+                    Buffer.BlockCopy(_buffer, 0, buffer, _buffer.Length - _headOffset, _tailOffset);
+                }
+            }
+
+            _buffer = buffer;
+            _headOffset = 0;
+            _tailOffset = _size;
+        }
+
+
+        public void Write<T>(T[] buffer, int index, int count)
+        {
+            if (count == 0)
+            {
+                return;
+            }
+
+            lock (_lock)
+            {
+                if ((_size + count) > _buffer.Length)
+                {
+                    SetCapacityLocked(BitUtils.AlignUp(_size + count, RingBufferAlignment));
+                }
+
+                if (_headOffset < _tailOffset)
+                {
+                    int tailLength = _buffer.Length - _tailOffset;
+
+                    if (tailLength >= count)
+                    {
+                        Buffer.BlockCopy(buffer, index, _buffer, _tailOffset, count);
+                    }
+                    else
+                    {
+                        Buffer.BlockCopy(buffer, index, _buffer, _tailOffset, tailLength);
+                        Buffer.BlockCopy(buffer, index + tailLength, _buffer, 0, count - tailLength);
+                    }
+                }
+                else
+                {
+                    Buffer.BlockCopy(buffer, index, _buffer, _tailOffset, count);
+                }
+
+                _size += count;
+                _tailOffset = (_tailOffset + count) % _buffer.Length;
+            }
+        }
+
+        public int Read<T>(T[] buffer, int index, int count)
+        {
+            lock (_lock)
+            {
+                if (count > _size)
+                {
+                    count = _size;
+                }
+
+                if (count == 0)
+                {
+                    return 0;
+                }
+
+                if (_headOffset < _tailOffset)
+                {
+                    Buffer.BlockCopy(_buffer, _headOffset, buffer, index, count);
+                }
+                else
+                {
+                    int tailLength = _buffer.Length - _headOffset;
+
+                    if (tailLength >= count)
+                    {
+                        Buffer.BlockCopy(_buffer, _headOffset, buffer, index, count);
+                    }
+                    else
+                    {
+                        Buffer.BlockCopy(_buffer, _headOffset, buffer, index, tailLength);
+                        Buffer.BlockCopy(_buffer, 0, buffer, index + tailLength, count - tailLength);
+                    }
+                }
+
+                _size -= count;
+                _headOffset = (_headOffset + count) % _buffer.Length;
+
+                if (_size == 0)
+                {
+                    _headOffset = 0;
+                    _tailOffset = 0;
+                }
+
+                return count;
+            }
+        }
+    }
+}

Ryujinx.Audio/Backends/Common/HardwareDeviceSessionOutputBase.cs

@@ -0,0 +1,89 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Memory;
+
+namespace Ryujinx.Audio.Backends.Common
+{
+    public abstract class HardwareDeviceSessionOutputBase : IHardwareDeviceSession
+    {
+        public IVirtualMemoryManager MemoryManager { get; }
+        public SampleFormat RequestedSampleFormat { get; }
+        public uint RequestedSampleRate { get; }
+        public uint RequestedChannelCount { get; }
+
+        public HardwareDeviceSessionOutputBase(IVirtualMemoryManager memoryManager, SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount)
+        {
+            MemoryManager = memoryManager;
+            RequestedSampleFormat = requestedSampleFormat;
+            RequestedSampleRate = requestedSampleRate;
+            RequestedChannelCount = requestedChannelCount;
+        }
+
+        private byte[] GetBufferSamples(AudioBuffer buffer)
+        {
+            if (buffer.DataPointer == 0)
+            {
+                return null;
+            }
+
+            byte[] data = new byte[buffer.DataSize];
+
+            MemoryManager.Read(buffer.DataPointer, data);
+
+            return data;
+        }
+
+        protected ulong GetSampleCount(AudioBuffer buffer)
+        {
+            return (ulong)BackendHelper.GetSampleCount(RequestedSampleFormat, (int)RequestedChannelCount, (int)buffer.DataSize);
+        }
+
+        public abstract void Dispose();
+        public abstract void PrepareToClose();
+        public abstract void QueueBuffer(AudioBuffer buffer);
+        public abstract void SetVolume(float volume);
+        public abstract float GetVolume();
+        public abstract void Start();
+        public abstract void Stop();
+        public abstract ulong GetPlayedSampleCount();
+        public abstract bool WasBufferFullyConsumed(AudioBuffer buffer);
+        public virtual bool RegisterBuffer(AudioBuffer buffer)
+        {
+            return RegisterBuffer(buffer, GetBufferSamples(buffer));
+        }
+
+        public virtual bool RegisterBuffer(AudioBuffer buffer, byte[] samples)
+        {
+            if (samples == null)
+            {
+                return false;
+            }
+
+            if (buffer.Data == null)
+            {
+                buffer.Data = samples;
+            }
+
+            return true;
+        }
+
+        public virtual void UnregisterBuffer(AudioBuffer buffer) { }
+    }
+}

Ryujinx.Audio/Backends/CompatLayer/CompatLayerHardwareDeviceDriver.cs

@@ -0,0 +1,146 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Backends.Common;
+using Ryujinx.Audio.Backends.Dummy;
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Common.Logging;
+using Ryujinx.Memory;
+using System;
+using System.Threading;
+
+using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
+
+namespace Ryujinx.Audio.Backends.CompatLayer
+{
+    public class CompatLayerHardwareDeviceDriver : IHardwareDeviceDriver
+    {
+        private IHardwareDeviceDriver _realDriver;
+
+        public CompatLayerHardwareDeviceDriver(IHardwareDeviceDriver realDevice)
+        {
+            _realDriver = realDevice;
+        }
+
+        public void Dispose()
+        {
+            _realDriver.Dispose();
+        }
+
+        public ManualResetEvent GetUpdateRequiredEvent()
+        {
+            return _realDriver.GetUpdateRequiredEvent();
+        }
+
+        private uint SelectHardwareChannelCount(uint targetChannelCount)
+        {
+            if (_realDriver.SupportsChannelCount(targetChannelCount))
+            {
+                return targetChannelCount;
+            }
+
+            return targetChannelCount switch
+            {
+                6 => SelectHardwareChannelCount(2),
+                2 => SelectHardwareChannelCount(1),
+                1 => throw new ArgumentException("No valid channel configuration found!"),
+                _ => throw new ArgumentException($"Invalid targetChannelCount {targetChannelCount}")
+            };
+        }
+
+        public IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount)
+        {
+            if (channelCount == 0)
+            {
+                channelCount = 2;
+            }
+
+            if (sampleRate == 0)
+            {
+                sampleRate = Constants.TargetSampleRate;
+            }
+
+            if (!_realDriver.SupportsDirection(direction))
+            {
+                if (direction == Direction.Input)
+                {
+                    Logger.Warning?.Print(LogClass.Audio, "The selected audio backend doesn't support audio input, fallback to dummy...");
+
+                    return new DummyHardwareDeviceSessionInput(this, memoryManager, sampleFormat, sampleRate, channelCount);
+                }
+
+                throw new NotImplementedException();
+            }
+
+            uint hardwareChannelCount = SelectHardwareChannelCount(channelCount);
+
+            IHardwareDeviceSession realSession = _realDriver.OpenDeviceSession(direction, memoryManager, sampleFormat, sampleRate, hardwareChannelCount);
+
+            if (hardwareChannelCount == channelCount)
+            {
+                return realSession;
+            }
+
+            if (direction == Direction.Input)
+            {
+                Logger.Warning?.Print(LogClass.Audio, $"The selected audio backend doesn't support the requested audio input configuration, fallback to dummy...");
+
+                // TODO: We currently don't support audio input upsampling/downsampling, implement this.
+                realSession.Dispose();
+
+                return new DummyHardwareDeviceSessionInput(this, memoryManager, sampleFormat, sampleRate, channelCount);
+            }
+
+            // It must be a HardwareDeviceSessionOutputBase.
+            if (realSession is not HardwareDeviceSessionOutputBase realSessionOutputBase)
+            {
+                throw new InvalidOperationException($"Real driver session class type isn't based on {typeof(HardwareDeviceSessionOutputBase).Name}.");
+            }
+
+            // If we need to do post processing before sending to the hardware device, wrap around it.
+            return new CompatLayerHardwareDeviceSession(realSessionOutputBase, channelCount);
+        }
+
+        public bool SupportsChannelCount(uint channelCount)
+        {
+            return channelCount == 1 || channelCount == 2 || channelCount == 6;
+        }
+
+        public bool SupportsSampleFormat(SampleFormat sampleFormat)
+        {
+            // TODO: More formats.
+            return sampleFormat == SampleFormat.PcmInt16;
+        }
+
+        public bool SupportsSampleRate(uint sampleRate)
+        {
+            // TODO: More sample rates.
+            return sampleRate == Constants.TargetSampleRate;
+        }
+
+        public IHardwareDeviceDriver GetRealDeviceDriver()
+        {
+            return _realDriver;
+        }
+
+        public bool SupportsDirection(Direction direction)
+        {
+            return direction == Direction.Input || direction == Direction.Output;
+        }
+    }
+}

Ryujinx.Audio/Backends/CompatLayer/CompatLayerHardwareDeviceSession.cs

@@ -0,0 +1,140 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Backends.Common;
+using Ryujinx.Audio.Common;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Backends.CompatLayer
+{
+    class CompatLayerHardwareDeviceSession : HardwareDeviceSessionOutputBase
+    {
+        private HardwareDeviceSessionOutputBase _realSession;
+        private uint _userChannelCount;
+
+        public CompatLayerHardwareDeviceSession(HardwareDeviceSessionOutputBase realSession, uint userChannelCount) : base(realSession.MemoryManager, realSession.RequestedSampleFormat, realSession.RequestedSampleRate, userChannelCount)
+        {
+            _realSession = realSession;
+            _userChannelCount = userChannelCount;
+        }
+
+        public override void Dispose()
+        {
+            _realSession.Dispose();
+        }
+
+        public override ulong GetPlayedSampleCount()
+        {
+            return _realSession.GetPlayedSampleCount();
+        }
+
+        public override float GetVolume()
+        {
+            return _realSession.GetVolume();
+        }
+
+        public override void PrepareToClose()
+        {
+            _realSession.PrepareToClose();
+        }
+
+        public override void QueueBuffer(AudioBuffer buffer)
+        {
+            _realSession.QueueBuffer(buffer);
+        }
+
+        public override bool RegisterBuffer(AudioBuffer buffer, byte[] samples)
+        {
+            if (RequestedSampleFormat != SampleFormat.PcmInt16)
+            {
+                throw new NotImplementedException("Downmixing formats other than PCM16 is not supported.");
+            }
+
+            if (samples == null)
+            {
+                return false;
+            }
+
+            short[] downmixedBufferPCM16;
+
+            ReadOnlySpan<short> samplesPCM16 = MemoryMarshal.Cast<byte, short>(samples);
+
+            if (_userChannelCount == 6)
+            {
+                downmixedBufferPCM16 = Downmixing.DownMixSurroundToStereo(samplesPCM16);
+
+                if (_realSession.RequestedChannelCount == 1)
+                {
+                    downmixedBufferPCM16 = Downmixing.DownMixStereoToMono(downmixedBufferPCM16);
+                }
+            }
+            else if (_userChannelCount == 2 && _realSession.RequestedChannelCount == 1)
+            {
+                downmixedBufferPCM16 = Downmixing.DownMixStereoToMono(samplesPCM16);
+            }
+            else
+            {
+                throw new NotImplementedException($"Downmixing from {_userChannelCount} to {_realSession.RequestedChannelCount} not implemented.");
+            }
+
+            byte[] downmixedBuffer = MemoryMarshal.Cast<short, byte>(downmixedBufferPCM16).ToArray();
+
+            AudioBuffer fakeBuffer = new AudioBuffer
+            {
+                BufferTag = buffer.BufferTag,
+                DataPointer = buffer.DataPointer,
+                DataSize  = (ulong)downmixedBuffer.Length
+            };
+
+            bool result = _realSession.RegisterBuffer(fakeBuffer, downmixedBuffer);
+
+            if (result)
+            {
+                buffer.Data = fakeBuffer.Data;
+                buffer.DataSize = fakeBuffer.DataSize;
+            }
+
+            return result;
+        }
+
+        public override void SetVolume(float volume)
+        {
+            _realSession.SetVolume(volume);
+        }
+
+        public override void Start()
+        {
+            _realSession.Start();
+        }
+
+        public override void Stop()
+        {
+            _realSession.Stop();
+        }
+
+        public override void UnregisterBuffer(AudioBuffer buffer)
+        {
+            _realSession.UnregisterBuffer(buffer);
+        }
+
+        public override bool WasBufferFullyConsumed(AudioBuffer buffer)
+        {
+            return _realSession.WasBufferFullyConsumed(buffer);
+        }
+    }
+}

Ryujinx.Audio/Backends/CompatLayer/Downmixing.cs

@@ -1,8 +1,25 @@
-using System;
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
-namespace Ryujinx.Audio
+namespace Ryujinx.Audio.Backends.CompatLayer
 {
     public static class Downmixing
     {

Ryujinx.Audio/Backends/Dummy/DummyHardwareDeviceDriver.cs

@@ -0,0 +1,96 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Memory;
+using System.Threading;
+
+using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
+
+namespace Ryujinx.Audio.Backends.Dummy
+{
+    public class DummyHardwareDeviceDriver : IHardwareDeviceDriver
+    {
+        private ManualResetEvent _updateRequiredEvent;
+
+        public DummyHardwareDeviceDriver()
+        {
+            _updateRequiredEvent = new ManualResetEvent(false);
+        }
+
+        public IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount)
+        {
+            if (sampleRate == 0)
+            {
+                sampleRate = Constants.TargetSampleRate;
+            }
+
+            if (channelCount == 0)
+            {
+                channelCount = 2;
+            }
+
+            if (direction == Direction.Output)
+            {
+                return new DummyHardwareDeviceSessionOutput(this, memoryManager, sampleFormat, sampleRate, channelCount);
+            }
+            else
+            {
+                return new DummyHardwareDeviceSessionInput(this, memoryManager, sampleFormat, sampleRate, channelCount);
+            }
+        }
+
+        public ManualResetEvent GetUpdateRequiredEvent()
+        {
+            return _updateRequiredEvent;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                // NOTE: The _updateRequiredEvent will be disposed somewhere else.
+            }
+        }
+
+        public bool SupportsSampleRate(uint sampleRate)
+        {
+            return true;
+        }
+
+        public bool SupportsSampleFormat(SampleFormat sampleFormat)
+        {
+            return true;
+        }
+
+        public bool SupportsDirection(Direction direction)
+        {
+            return direction == Direction.Output || direction == Direction.Input;
+        }
+
+        public bool SupportsChannelCount(uint channelCount)
+        {
+            return channelCount == 1 || channelCount == 2 || channelCount == 6;
+        }
+    }
+}

Ryujinx.Audio/Backends/Dummy/DummyHardwareDeviceSessionInput.cs

@@ -0,0 +1,84 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Memory;
+using System;
+
+namespace Ryujinx.Audio.Backends.Dummy
+{
+    class DummyHardwareDeviceSessionInput : IHardwareDeviceSession
+    {
+        private float _volume;
+        private IHardwareDeviceDriver _manager;
+        private IVirtualMemoryManager _memoryManager;
+
+        public DummyHardwareDeviceSessionInput(IHardwareDeviceDriver manager, IVirtualMemoryManager memoryManager, SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount)
+        {
+            _volume = 1.0f;
+            _manager = manager;
+            _memoryManager = memoryManager;
+        }
+
+        public void Dispose()
+        {
+            // Nothing to do.
+        }
+
+        public ulong GetPlayedSampleCount()
+        {
+            // Not implemented for input.
+            throw new NotSupportedException();
+        }
+
+        public float GetVolume()
+        {
+            return _volume;
+        }
+
+        public void PrepareToClose() { }
+
+        public void QueueBuffer(AudioBuffer buffer)
+        {
+            _memoryManager.Fill(buffer.DataPointer, buffer.DataSize, 0);
+
+            _manager.GetUpdateRequiredEvent().Set();
+        }
+
+        public bool RegisterBuffer(AudioBuffer buffer)
+        {
+            return buffer.DataPointer != 0;
+        }
+
+        public void SetVolume(float volume)
+        {
+            _volume = volume;
+        }
+
+        public void Start() { }
+
+        public void Stop() { }
+
+        public void UnregisterBuffer(AudioBuffer buffer) { }
+
+        public bool WasBufferFullyConsumed(AudioBuffer buffer)
+        {
+            return true;
+        }
+    }
+}

Ryujinx.Audio/Backends/Dummy/DummyHardwareDeviceSessionOutput.cs

@@ -0,0 +1,79 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Backends.Common;
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Memory;
+using System.Threading;
+
+namespace Ryujinx.Audio.Backends.Dummy
+{
+    internal class DummyHardwareDeviceSessionOutput : HardwareDeviceSessionOutputBase
+    {
+        private float _volume;
+        private IHardwareDeviceDriver _manager;
+
+        private ulong _playedSampleCount;
+
+        public DummyHardwareDeviceSessionOutput(IHardwareDeviceDriver manager, IVirtualMemoryManager memoryManager, SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount) : base(memoryManager, requestedSampleFormat, requestedSampleRate, requestedChannelCount)
+        {
+            _volume = 1.0f;
+            _manager = manager;
+        }
+
+        public override void Dispose()
+        {
+            // Nothing to do.
+        }
+
+        public override ulong GetPlayedSampleCount()
+        {
+            return Interlocked.Read(ref _playedSampleCount);
+        }
+
+        public override float GetVolume()
+        {
+            return _volume;
+        }
+
+        public override void PrepareToClose() { }
+
+        public override void QueueBuffer(AudioBuffer buffer)
+        {
+            Interlocked.Add(ref _playedSampleCount, GetSampleCount(buffer));
+
+            _manager.GetUpdateRequiredEvent().Set();
+        }
+
+        public override void SetVolume(float volume)
+        {
+            _volume = volume;
+        }
+
+        public override void Start() { }
+
+        public override void Stop() { }
+
+        public override void UnregisterBuffer(AudioBuffer buffer) { }
+
+        public override bool WasBufferFullyConsumed(AudioBuffer buffer)
+        {
+            return true;
+        }
+    }
+}

Ryujinx.Audio/Common/AudioBuffer.cs

@@ -0,0 +1,53 @@
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Integration;
+
+namespace Ryujinx.Audio.Common
+{
+    /// <summary>
+    /// Represent an audio buffer that will be used by an <see cref="IHardwareDeviceSession"/>.
+    /// </summary>
+    public class AudioBuffer
+    {
+        /// <summary>
+        /// Unique tag of this buffer.
+        /// </summary>
+        /// <remarks>Unique per session</remarks>
+        public ulong BufferTag;
+
+        /// <summary>
+        /// Pointer to the user samples.
+        /// </summary>
+        public ulong DataPointer;
+
+        /// <summary>
+        /// Size of the user samples region.
+        /// </summary>
+        public ulong DataSize;
+
+        /// <summary>
+        ///  The timestamp at which the buffer was played.
+        /// </summary>
+        /// <remarks>Not used but useful for debugging</remarks>
+        public ulong PlayedTimestamp;
+
+        /// <summary>
+        /// The user samples.
+        /// </summary>
+        public byte[] Data;
+    }
+}

Ryujinx.Audio/Common/AudioDeviceSession.cs

@@ -0,0 +1,532 @@
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Integration;
+using Ryujinx.Common;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Common
+{
+    /// <summary>
+    /// An audio device session.
+    /// </summary>
+    class AudioDeviceSession : IDisposable
+    {
+        /// <summary>
+        /// The volume of the <see cref="AudioDeviceSession"/>.
+        /// </summary>
+        private float _volume;
+
+        /// <summary>
+        /// The state of the <see cref="AudioDeviceSession"/>.
+        /// </summary>
+        private AudioDeviceState _state;
+
+        /// <summary>
+        /// Array of all buffers currently used or released.
+        /// </summary>
+        private AudioBuffer[] _buffers;
+
+        /// <summary>
+        /// The server index inside <see cref="_buffers"/> (appended but not queued to device driver).
+        /// </summary>
+        private uint _serverBufferIndex;
+
+        /// <summary>
+        /// The hardware index inside <see cref="_buffers"/> (queued to device driver).
+        /// </summary>
+        private uint _hardwareBufferIndex;
+
+        /// <summary>
+        /// The released index inside <see cref="_buffers"/> (released by the device driver).
+        /// </summary>
+        private uint _releasedBufferIndex;
+
+        /// <summary>
+        /// The count of buffer appended (server side).
+        /// </summary>
+        private uint _bufferAppendedCount;
+
+        /// <summary>
+        /// The count of buffer registered (driver side).
+        /// </summary>
+        private uint _bufferRegisteredCount;
+
+        /// <summary>
+        /// The count of buffer released (released by the driver side).
+        /// </summary>
+        private uint _bufferReleasedCount;
+
+        /// <summary>
+        /// The released buffer event.
+        /// </summary>
+        private IWritableEvent _bufferEvent;
+
+        /// <summary>
+        /// The session on the device driver.
+        /// </summary>
+        private IHardwareDeviceSession _hardwareDeviceSession;
+
+        /// <summary>
+        /// Max number of buffers that can be registered to the device driver at a time.
+        /// </summary>
+        private uint _bufferRegisteredLimit;
+
+        /// <summary>
+        /// Create a new <see cref="AudioDeviceSession"/>.
+        /// </summary>
+        /// <param name="deviceSession">The device driver session associated</param>
+        /// <param name="bufferEvent">The release buffer event</param>
+        /// <param name="bufferRegisteredLimit">The max number of buffers that can be registered to the device driver at a time</param>
+        public AudioDeviceSession(IHardwareDeviceSession deviceSession, IWritableEvent bufferEvent, uint bufferRegisteredLimit = 4)
+        {
+            _bufferEvent = bufferEvent;
+            _hardwareDeviceSession = deviceSession;
+            _bufferRegisteredLimit = bufferRegisteredLimit;
+
+            _buffers = new AudioBuffer[Constants.AudioDeviceBufferCountMax];
+            _serverBufferIndex = 0;
+            _hardwareBufferIndex = 0;
+            _releasedBufferIndex = 0;
+
+            _bufferAppendedCount = 0;
+            _bufferRegisteredCount = 0;
+            _bufferReleasedCount = 0;
+            _volume = 1.0f;
+            _state = AudioDeviceState.Stopped;
+        }
+
+        /// <summary>
+        /// Get the released buffer event.
+        /// </summary>
+        /// <returns>The released buffer event</returns>
+        public IWritableEvent GetBufferEvent()
+        {
+            return _bufferEvent;
+        }
+
+        /// <summary>
+        /// Get the state of the session.
+        /// </summary>
+        /// <returns>The state of the session</returns>
+        public AudioDeviceState GetState()
+        {
+            Debug.Assert(_state == AudioDeviceState.Started || _state == AudioDeviceState.Stopped);
+
+            return _state;
+        }
+
+        /// <summary>
+        /// Get the total buffer count (server + driver + released).
+        /// </summary>
+        /// <returns>Return the total buffer count</returns>
+        private uint GetTotalBufferCount()
+        {
+            uint bufferCount = _bufferAppendedCount + _bufferRegisteredCount + _bufferReleasedCount;
+
+            Debug.Assert(bufferCount <= Constants.AudioDeviceBufferCountMax);
+
+            return bufferCount;
+        }
+
+        /// <summary>
+        /// Register a new <see cref="AudioBuffer"/> on the server side.
+        /// </summary>
+        /// <param name="buffer">The <see cref="AudioBuffer"/> to register</param>
+        /// <returns>True if the operation succeeded</returns>
+        private bool RegisterBuffer(AudioBuffer buffer)
+        {
+            if (GetTotalBufferCount() == Constants.AudioDeviceBufferCountMax)
+            {
+                return false;
+            }
+
+            _buffers[_serverBufferIndex] = buffer;
+            _serverBufferIndex = (_serverBufferIndex + 1) % Constants.AudioDeviceBufferCountMax;
+            _bufferAppendedCount++;
+
+            return true;
+        }
+
+        /// <summary>
+        /// Flush server buffers to hardware.
+        /// </summary>
+        private void FlushToHardware()
+        {
+            uint bufferToFlushCount = Math.Min(Math.Min(_bufferAppendedCount, 4), _bufferRegisteredLimit - _bufferRegisteredCount);
+
+            AudioBuffer[] buffersToFlush = new AudioBuffer[bufferToFlushCount];
+
+            uint hardwareBufferIndex = _hardwareBufferIndex;
+
+            for (int i = 0; i < buffersToFlush.Length; i++)
+            {
+                buffersToFlush[i] = _buffers[_hardwareBufferIndex];
+
+                _bufferAppendedCount--;
+                _bufferRegisteredCount++;
+
+                hardwareBufferIndex = (hardwareBufferIndex + 1) % Constants.AudioDeviceBufferCountMax;
+            }
+
+            _hardwareBufferIndex = hardwareBufferIndex;
+
+            for (int i = 0; i < buffersToFlush.Length; i++)
+            {
+                _hardwareDeviceSession.QueueBuffer(buffersToFlush[i]);
+            }
+        }
+
+        /// <summary>
+        /// Get the current index of the <see cref="AudioBuffer"/> playing on the driver side.
+        /// </summary>
+        /// <param name="playingIndex">The output index of the <see cref="AudioBuffer"/> playing on the driver side</param>
+        /// <returns>True if any buffer is playing</returns>
+        private bool TryGetPlayingBufferIndex(out uint playingIndex)
+        {
+            if (_bufferRegisteredCount > 0)
+            {
+                playingIndex = (_hardwareBufferIndex - _bufferRegisteredCount) % Constants.AudioDeviceBufferCountMax;
+
+                return true;
+            }
+
+            playingIndex = 0;
+
+            return false;
+        }
+
+        /// <summary>
+        /// Try to pop the <see cref="AudioBuffer"/> playing on the driver side.
+        /// </summary>
+        /// <param name="buffer">The output <see cref="AudioBuffer"/> playing on the driver side</param>
+        /// <returns>True if any buffer is playing</returns>
+        private bool TryPopPlayingBuffer(out AudioBuffer buffer)
+        {
+            if (_bufferRegisteredCount > 0)
+            {
+                uint bufferIndex = (_hardwareBufferIndex - _bufferRegisteredCount) % Constants.AudioDeviceBufferCountMax;
+
+                buffer = _buffers[bufferIndex];
+
+                _buffers[bufferIndex] = null;
+
+                _bufferRegisteredCount--;
+
+                return true;
+            }
+
+            buffer = null;
+
+            return false;
+        }
+
+        /// <summary>
+        /// Try to pop a <see cref="AudioBuffer"/> released by the driver side.
+        /// </summary>
+        /// <param name="buffer">The output <see cref="AudioBuffer"/> released by the driver side</param>
+        /// <returns>True if any buffer has been released</returns>
+        public bool TryPopReleasedBuffer(out AudioBuffer buffer)
+        {
+            if (_bufferReleasedCount > 0)
+            {
+                uint bufferIndex = (_releasedBufferIndex - _bufferReleasedCount) % Constants.AudioDeviceBufferCountMax;
+
+                buffer = _buffers[bufferIndex];
+
+                _buffers[bufferIndex] = null;
+
+                _bufferReleasedCount--;
+
+                return true;
+            }
+
+            buffer = null;
+
+            return false;
+        }
+
+        /// <summary>
+        /// Release a <see cref="AudioBuffer"/>.
+        /// </summary>
+        /// <param name="buffer">The <see cref="AudioBuffer"/> to release</param>
+        private void ReleaseBuffer(AudioBuffer buffer)
+        {
+            buffer.PlayedTimestamp = (ulong)PerformanceCounter.ElapsedNanoseconds;
+
+            _bufferRegisteredCount--;
+            _bufferReleasedCount++;
+
+            _releasedBufferIndex = (_releasedBufferIndex + 1) % Constants.AudioDeviceBufferCountMax;
+        }
+
+        /// <summary>
+        /// Update the released buffers.
+        /// </summary>
+        /// <param name="updateForStop">True if the session is currently stopping</param>
+        private void UpdateReleaseBuffers(bool updateForStop = false)
+        {
+            bool wasAnyBuffersReleased = false;
+
+            while (TryGetPlayingBufferIndex(out uint playingIndex))
+            {
+                if (!updateForStop && !_hardwareDeviceSession.WasBufferFullyConsumed(_buffers[playingIndex]))
+                {
+                    break;
+                }
+
+                if (updateForStop)
+                {
+                    _hardwareDeviceSession.UnregisterBuffer(_buffers[playingIndex]);
+                }
+
+                ReleaseBuffer(_buffers[playingIndex]);
+
+                wasAnyBuffersReleased = true;
+            }
+
+            if (wasAnyBuffersReleased)
+            {
+                _bufferEvent.Signal();
+            }
+        }
+
+        /// <summary>
+        /// Append a new <see cref="AudioBuffer"/>.
+        /// </summary>
+        /// <param name="buffer">The <see cref="AudioBuffer"/> to append</param>
+        /// <returns>True if the buffer was appended</returns>
+        public bool AppendBuffer(AudioBuffer buffer)
+        {
+            if (_hardwareDeviceSession.RegisterBuffer(buffer))
+            {
+                if (RegisterBuffer(buffer))
+                {
+                    FlushToHardware();
+
+                    return true;
+                }
+
+                _hardwareDeviceSession.UnregisterBuffer(buffer);
+            }
+
+            return false;
+        }
+
+        public bool AppendUacBuffer(AudioBuffer buffer, uint handle)
+        {
+            // NOTE: On hardware, there is another RegisterBuffer method taking an handle.
+            // This variant of the call always return false (stubbed?) as a result this logic will never succeed.
+
+            return false;
+        }
+
+        /// <summary>
+        /// Start the audio session.
+        /// </summary>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode Start()
+        {
+            if (_state == AudioDeviceState.Started)
+            {
+                return ResultCode.OperationFailed;
+            }
+
+            _hardwareDeviceSession.Start();
+
+            _state = AudioDeviceState.Started;
+
+            FlushToHardware();
+
+            _hardwareDeviceSession.SetVolume(_volume);
+
+            return ResultCode.Success;
+        }
+
+        /// <summary>
+        /// Stop the audio session.
+        /// </summary>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode Stop()
+        {
+            if (_state == AudioDeviceState.Started)
+            {
+                _hardwareDeviceSession.Stop();
+
+                UpdateReleaseBuffers(true);
+
+                _state = AudioDeviceState.Stopped;
+            }
+
+            return ResultCode.Success;
+        }
+
+        /// <summary>
+        /// Get the volume of the session.
+        /// </summary>
+        /// <returns>The volume of the session</returns>
+        public float GetVolume()
+        {
+            return _hardwareDeviceSession.GetVolume();
+        }
+
+        /// <summary>
+        /// Set the volume of the session.
+        /// </summary>
+        /// <param name="volume">The new volume to set</param>
+        public void SetVolume(float volume)
+        {
+            _volume = volume;
+
+            if (_state == AudioDeviceState.Started)
+            {
+                _hardwareDeviceSession.SetVolume(volume);
+            }
+        }
+
+        /// <summary>
+        /// Get the count of buffer currently in use (server + driver side).
+        /// </summary>
+        /// <returns>The count of buffer currently in use</returns>
+        public uint GetBufferCount()
+        {
+            return _bufferAppendedCount + _bufferRegisteredCount;
+        }
+
+        /// <summary>
+        /// Check if a buffer is present.
+        /// </summary>
+        /// <param name="bufferTag">The unique tag of the buffer</param>
+        /// <returns>Return true if a buffer is present</returns>
+        public bool ContainsBuffer(ulong bufferTag)
+        {
+            uint bufferIndex = (_releasedBufferIndex - _bufferReleasedCount) % Constants.AudioDeviceBufferCountMax;
+
+            for (int i = 0; i < GetTotalBufferCount(); i++)
+            {
+                if (_buffers[bufferIndex].BufferTag == bufferTag)
+                {
+                    return true;
+                }
+
+                bufferIndex = (bufferIndex + 1) % Constants.AudioDeviceBufferCountMax;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Get the count of sample played in this session.
+        /// </summary>
+        /// <returns>The count of sample played in this session</returns>
+        public ulong GetPlayedSampleCount()
+        {
+            if (_state == AudioDeviceState.Stopped)
+            {
+                return 0;
+            }
+            else
+            {
+                return _hardwareDeviceSession.GetPlayedSampleCount();
+            }
+        }
+
+        /// <summary>
+        /// Flush all buffers to the initial state.
+        /// </summary>
+        /// <returns>True if any buffer was flushed</returns>
+        public bool FlushBuffers()
+        {
+            if (_state == AudioDeviceState.Stopped)
+            {
+                return false;
+            }
+
+            uint bufferCount = GetBufferCount();
+
+            while (TryPopReleasedBuffer(out AudioBuffer buffer))
+            {
+                _hardwareDeviceSession.UnregisterBuffer(buffer);
+            }
+
+            while (TryPopPlayingBuffer(out AudioBuffer buffer))
+            {
+                _hardwareDeviceSession.UnregisterBuffer(buffer);
+            }
+
+            if (_bufferRegisteredCount == 0 || (_bufferReleasedCount + _bufferAppendedCount) > Constants.AudioDeviceBufferCountMax)
+            {
+                return false;
+            }
+
+            _bufferReleasedCount += _bufferAppendedCount;
+            _releasedBufferIndex = (_releasedBufferIndex + _bufferAppendedCount) % Constants.AudioDeviceBufferCountMax;
+            _bufferAppendedCount = 0;
+            _hardwareBufferIndex = _serverBufferIndex;
+
+            if (bufferCount > 0)
+            {
+                _bufferEvent.Signal();
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// Update the session.
+        /// </summary>
+        public void Update()
+        {
+            if (_state == AudioDeviceState.Started)
+            {
+                UpdateReleaseBuffers();
+                FlushToHardware();
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                // Tell the hardware session that we are ending.
+                _hardwareDeviceSession.PrepareToClose();
+
+                // Unregister all buffers
+
+                while (TryPopReleasedBuffer(out AudioBuffer buffer))
+                {
+                    _hardwareDeviceSession.UnregisterBuffer(buffer);
+                }
+
+                while (TryPopPlayingBuffer(out AudioBuffer buffer))
+                {
+                    _hardwareDeviceSession.UnregisterBuffer(buffer);
+                }
+
+                // Finally dispose hardware session.
+                _hardwareDeviceSession.Dispose();
+
+                _bufferEvent.Signal();
+            }
+        }
+    }
+}

Ryujinx.Audio/Common/AudioDeviceState.cs

@@ -0,0 +1,35 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Common
+{
+    /// <summary>
+    /// Audio device state.
+    /// </summary>
+    public enum AudioDeviceState : uint
+    {
+        /// <summary>
+        /// The audio device is started.
+        /// </summary>
+        Started,
+
+        /// <summary>
+        /// The audio device is stopped.
+        /// </summary>
+        Stopped
+    }
+}

Ryujinx.Audio/Common/AudioInputConfiguration.cs

@@ -0,0 +1,46 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Common
+{
+    /// <summary>
+    /// Audio user input configuration.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct AudioInputConfiguration
+    {
+        /// <summary>
+        /// The target sample rate of the user.
+        /// </summary>
+        /// <remarks>Only 48000Hz is considered valid, other sample rates will be refused.</remarks>
+        public uint SampleRate;
+
+        /// <summary>
+        /// The target channel count of the user.
+        /// </summary>
+        /// <remarks>Only Stereo and Surround are considered valid, other configurations will be refused.</remarks>
+        /// <remarks>Not used in audin.</remarks>
+        public ushort ChannelCount;
+
+        /// <summary>
+        /// Reserved/unused.
+        /// </summary>
+        private ushort _reserved;
+    }
+}

Ryujinx.Audio/Common/AudioOutputConfiguration.cs

@@ -0,0 +1,54 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Common.Memory;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Common
+{
+    /// <summary>
+    /// Audio system output configuration.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct AudioOutputConfiguration
+    {
+        /// <summary>
+        /// The target sample rate of the system.
+        /// </summary>
+        public uint SampleRate;
+
+        /// <summary>
+        /// The target channel count of the system.
+        /// </summary>
+        public uint ChannelCount;
+
+        /// <summary>
+        /// Reserved/unused
+        /// </summary>
+        public SampleFormat SampleFormat;
+
+        /// <summary>
+        /// Reserved/unused.
+        /// </summary>
+        private Array3<byte> _padding;
+
+        /// <summary>
+        /// The initial audio system state.
+        /// </summary>
+        public AudioDeviceState AudioOutState;
+    }
+}

Ryujinx.Audio/Common/AudioUserBuffer.cs

@@ -0,0 +1,53 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Common
+{
+    /// <summary>
+    /// Audio user buffer.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct AudioUserBuffer
+    {
+        /// <summary>
+        /// Pointer to the next buffer (ignored).
+        /// </summary>
+        public ulong NextBuffer;
+
+        /// <summary>
+        /// Pointer to the user samples.
+        /// </summary>
+        public ulong Data;
+
+        /// <summary>
+        /// Capacity of the buffer (unused).
+        /// </summary>
+        public ulong Capacity;
+
+        /// <summary>
+        /// Size of the user samples region.
+        /// </summary>
+        public ulong DataSize;
+
+        /// <summary>
+        /// Offset in the user samples region (unused).
+        /// </summary>
+        public ulong DataOffset;
+    }
+}

Ryujinx.Audio/Common/SampleFormat.cs

@@ -0,0 +1,60 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Common
+{
+    /// <summary>
+    /// Sample format definition.
+    /// </summary>
+    public enum SampleFormat : byte
+    {
+        /// <summary>
+        /// Invalid sample format.
+        /// </summary>
+        Invalid = 0,
+
+        /// <summary>
+        /// PCM8 sample format. (unsupported)
+        /// </summary>
+        PcmInt8 = 1,
+
+        /// <summary>
+        /// PCM16 sample format.
+        /// </summary>
+        PcmInt16 = 2,
+
+        /// <summary>
+        /// PCM24 sample format. (unsupported)
+        /// </summary>
+        PcmInt24 = 3,
+
+        /// <summary>
+        /// PCM32 sample format.
+        /// </summary>
+        PcmInt32 = 4,
+
+        /// <summary>
+        /// PCM Float sample format.
+        /// </summary>
+        PcmFloat = 5,
+
+        /// <summary>
+        /// ADPCM sample format. (Also known as GC-ADPCM)
+        /// </summary>
+        Adpcm = 6
+    }
+}

Ryujinx.Audio/Constants.cs

@@ -0,0 +1,192 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio
+{
+    /// <summary>
+    /// Define constants used by the audio system.
+    /// </summary>
+    public static class Constants
+    {
+        /// <summary>
+        /// The default device output name.
+        /// </summary>
+        public const string DefaultDeviceOutputName = "DeviceOut";
+
+        /// <summary>
+        /// The default device input name.
+        /// </summary>
+        public const string DefaultDeviceInputName = "BuiltInHeadset";
+
+        /// <summary>
+        /// The maximum number of channels supported. (6 channels for 5.1 surround)
+        /// </summary>
+        public const int ChannelCountMax = 6;
+
+        /// <summary>
+        /// The maximum number of channels supported per voice.
+        /// </summary>
+        public const int VoiceChannelCountMax = ChannelCountMax;
+
+        /// <summary>
+        /// The maximum count of mix buffer supported per operations (volumes, mix effect, ...)
+        /// </summary>
+        public const int MixBufferCountMax = 24;
+
+        /// <summary>
+        /// The maximum count of wavebuffer per voice.
+        /// </summary>
+        public const int VoiceWaveBufferCount = 4;
+
+        /// <summary>
+        /// The maximum count of biquad filter per voice.
+        /// </summary>
+        public const int VoiceBiquadFilterCount = 2;
+
+        /// <summary>
+        /// The lowest priority that a voice can have.
+        /// </summary>
+        public const int VoiceLowestPriority = 0xFF;
+
+        /// <summary>
+        /// The highest priority that a voice can have.
+        /// </summary>
+        /// <remarks>Voices with the highest priority will not be dropped if a voice drop needs to occur.</remarks>
+        public const int VoiceHighestPriority = 0;
+
+        /// <summary>
+        /// Maximum <see cref="Common.BehaviourParameter.ErrorInfo"/> that can be returned by <see cref="Parameter.BehaviourErrorInfoOutStatus"/>.
+        /// </summary>
+        public const int MaxErrorInfos = 10;
+
+        /// <summary>
+        /// Default alignment for buffers.
+        /// </summary>
+        public const int BufferAlignment = 0x40;
+
+        /// <summary>
+        /// Alignment required for the work buffer.
+        /// </summary>
+        public const int WorkBufferAlignment = 0x1000;
+
+        /// <summary>
+        /// Alignment required for every performance metrics frame.
+        /// </summary>
+        public const int PerformanceMetricsPerFramesSizeAlignment = 0x100;
+
+        /// <summary>
+        /// The id of the final mix.
+        /// </summary>
+        public const int FinalMixId = 0;
+
+        /// <summary>
+        /// The id defining an unused mix id.
+        /// </summary>
+        public const int UnusedMixId = int.MaxValue;
+
+        /// <summary>
+        /// The id defining an unused splitter id as a signed integer.
+        /// </summary>
+        public const int UnusedSplitterIdInt = -1;
+
+        /// <summary>
+        /// The id defining an unused splitter id.
+        /// </summary>
+        public const uint UnusedSplitterId = uint.MaxValue;
+
+        /// <summary>
+        /// The id of invalid/unused node id.
+        /// </summary>
+        public const int InvalidNodeId = -268435456;
+
+        /// <summary>
+        /// The indice considered invalid for processing order.
+        /// </summary>
+        public const int InvalidProcessingOrder = -1;
+
+        /// <summary>
+        /// The maximum number of audio renderer sessions allowed to be created system wide.
+        /// </summary>
+        public const int AudioRendererSessionCountMax = 2;
+
+        /// <summary>
+        /// The maximum number of audio output sessions allowed to be created system wide.
+        /// </summary>
+        public const int AudioOutSessionCountMax = 12;
+
+        /// <summary>
+        /// The maximum number of audio input sessions allowed to be created system wide.
+        /// </summary>
+        public const int AudioInSessionCountMax = 4;
+
+        /// <summary>
+        /// Maximum buffers supported by one audio device session.
+        /// </summary>
+        public const int AudioDeviceBufferCountMax = 32;
+
+        /// <summary>
+        /// The target sample rate of the audio renderer. (48kHz)
+        /// </summary>
+        public const uint TargetSampleRate = 48000;
+
+        /// <summary>
+        /// The target sample size of the audio renderer. (PCM16)
+        /// </summary>
+        public const int TargetSampleSize = sizeof(ushort);
+
+        /// <summary>
+        /// The target sample count per audio renderer update.
+        /// </summary>
+        public const int TargetSampleCount = 240;
+
+        /// <summary>
+        /// The size of an upsampler entry to process upsampling to <see cref="TargetSampleRate"/>.
+        /// </summary>
+        public const int UpSampleEntrySize = TargetSampleCount * VoiceChannelCountMax;
+
+        /// <summary>
+        /// The target audio latency computed from <see cref="TargetSampleRate"/> and <see cref="TargetSampleCount"/>.
+        /// </summary>
+        public const int AudioProcessorMaxUpdateTimeTarget = 1000000000 / ((int)TargetSampleRate / TargetSampleCount); // 5.00 ms
+
+        /// <summary>
+        /// The maximum update time of the DSP on original hardware.
+        /// </summary>
+        public const int AudioProcessorMaxUpdateTime = 5760000; // 5.76 ms
+
+        /// <summary>
+        /// The maximum update time per audio renderer session.
+        /// </summary>
+        public const int AudioProcessorMaxUpdateTimePerSessions = AudioProcessorMaxUpdateTime / AudioRendererSessionCountMax;
+
+        /// <summary>
+        /// Guest timer frequency used for system ticks.
+        /// </summary>
+        public const int TargetTimerFrequency = 19200000;
+
+        /// <summary>
+        /// The default coefficients used for standard 5.1 surround to stereo downmixing.
+        /// </summary>
+        public static float[] DefaultSurroundToStereoCoefficients = new float[4]
+        {
+            1.0f,
+            0.707f,
+            0.251f,
+            0.707f,
+        };
+    }
+}

Ryujinx.Audio/IAalOutput.cs

@@ -1,56 +0,0 @@
-using System;
-
-namespace Ryujinx.Audio
-{
-    public interface IAalOutput : IDisposable
-    {
-        bool SupportsChannelCount(int channels);
-
-        private int SelectHardwareChannelCount(int targetChannelCount)
-        {
-            if (SupportsChannelCount(targetChannelCount))
-            {
-                return targetChannelCount;
-            }
-
-            return targetChannelCount switch
-            {
-                6 => SelectHardwareChannelCount(2),
-                2 => SelectHardwareChannelCount(1),
-                1 => throw new ArgumentException("No valid channel configuration found!"),
-                _ => throw new ArgumentException($"Invalid targetChannelCount {targetChannelCount}"),
-            };
-        }
-
-        int OpenTrack(int sampleRate, int channels, ReleaseCallback callback)
-        {
-            return OpenHardwareTrack(sampleRate, SelectHardwareChannelCount(channels), channels, callback);
-        }
-
-        int OpenHardwareTrack(int sampleRate, int hardwareChannels, int virtualChannels, ReleaseCallback callback);
-
-        void CloseTrack(int trackId);
-
-        bool ContainsBuffer(int trackId, long bufferTag);
-
-        long[] GetReleasedBuffers(int trackId, int maxCount);
-
-        void AppendBuffer<T>(int trackId, long bufferTag, T[] buffer) where T : struct;
-
-        void Start(int trackId);
-
-        void Stop(int trackId);
-
-        uint GetBufferCount(int trackId);
-
-        ulong GetPlayedSampleCount(int trackId);
-
-        bool FlushBuffers(int trackId);
-
-        float GetVolume(int trackId);
-
-        void SetVolume(int trackId, float volume);
-
-        PlaybackState GetState(int trackId);
-    }
-}

Ryujinx.Audio/Input/AudioInputManager.cs

@@ -0,0 +1,262 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Common.Logging;
+using Ryujinx.Memory;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Input
+{
+    /// <summary>
+    /// The audio input manager.
+    /// </summary>
+    public class AudioInputManager : IDisposable
+    {
+        private object _lock = new object();
+
+        /// <summary>
+        /// Lock used for session allocation.
+        /// </summary>
+        private object _sessionLock = new object();
+
+        /// <summary>
+        /// The session ids allocation table.
+        /// </summary>
+        private int[] _sessionIds;
+
+        /// <summary>
+        /// The device driver.
+        /// </summary>
+        private IHardwareDeviceDriver _deviceDriver;
+
+        /// <summary>
+        /// The events linked to each session.
+        /// </summary>
+        private IWritableEvent[] _sessionsBufferEvents;
+
+        /// <summary>
+        /// The <see cref="AudioInputSystem"/> session instances.
+        /// </summary>
+        private AudioInputSystem[] _sessions;
+
+        /// <summary>
+        /// The count of active sessions.
+        /// </summary>
+        private int _activeSessionCount;
+
+        /// <summary>
+        /// Create a new <see cref="AudioInputManager"/>.
+        /// </summary>
+        public AudioInputManager()
+        {
+            _sessionIds = new int[Constants.AudioInSessionCountMax];
+            _sessions = new AudioInputSystem[Constants.AudioInSessionCountMax];
+            _activeSessionCount = 0;
+
+            for (int i = 0; i < _sessionIds.Length; i++)
+            {
+                _sessionIds[i] = i;
+            }
+        }
+
+        /// <summary>
+        /// Initialize the <see cref="AudioInputManager"/>.
+        /// </summary>
+        /// <param name="deviceDriver">The device driver.</param>
+        /// <param name="sessionRegisterEvents">The events associated to each session.</param>
+        public void Initialize(IHardwareDeviceDriver deviceDriver, IWritableEvent[] sessionRegisterEvents)
+        {
+            _deviceDriver = deviceDriver;
+            _sessionsBufferEvents = sessionRegisterEvents;
+        }
+
+        /// <summary>
+        /// Acquire a new session id.
+        /// </summary>
+        /// <returns>A new session id.</returns>
+        private int AcquireSessionId()
+        {
+            lock (_sessionLock)
+            {
+                int index = _activeSessionCount;
+
+                Debug.Assert(index < _sessionIds.Length);
+
+                int sessionId = _sessionIds[index];
+
+                _sessionIds[index] = -1;
+
+                _activeSessionCount++;
+
+                Logger.Info?.Print(LogClass.AudioRenderer, $"Registered new input ({sessionId})");
+
+                return sessionId;
+            }
+        }
+
+        /// <summary>
+        /// Release a given <paramref name="sessionId"/>.
+        /// </summary>
+        /// <param name="sessionId">The session id to release.</param>
+        private void ReleaseSessionId(int sessionId)
+        {
+            lock (_sessionLock)
+            {
+                Debug.Assert(_activeSessionCount > 0);
+
+                int newIndex = --_activeSessionCount;
+
+                _sessionIds[newIndex] = sessionId;
+            }
+
+            Logger.Info?.Print(LogClass.AudioRenderer, $"Unregistered input ({sessionId})");
+        }
+
+        /// <summary>
+        /// Used to update audio input system.
+        /// </summary>
+        public void Update()
+        {
+            lock (_sessionLock)
+            {
+                foreach (AudioInputSystem input in _sessions)
+                {
+                    input?.Update();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Register a new <see cref="AudioInputSystem"/>.
+        /// </summary>
+        /// <param name="input">The <see cref="AudioInputSystem"/> to register.</param>
+        private void Register(AudioInputSystem input)
+        {
+            lock (_sessionLock)
+            {
+                _sessions[input.GetSessionId()] = input;
+            }
+        }
+
+        /// <summary>
+        /// Unregister a new <see cref="AudioInputSystem"/>.
+        /// </summary>
+        /// <param name="input">The <see cref="AudioInputSystem"/> to unregister.</param>
+        internal void Unregister(AudioInputSystem input)
+        {
+            lock (_sessionLock)
+            {
+                int sessionId = input.GetSessionId();
+
+                _sessions[input.GetSessionId()] = null;
+
+                ReleaseSessionId(sessionId);
+            }
+        }
+
+        /// <summary>
+        /// Get the list of all audio inputs names.
+        /// </summary>
+        /// <param name="filtered">If true, filter disconnected devices</param>
+        /// <returns>The list of all audio inputs name</returns>
+        public string[] ListAudioIns(bool filtered)
+        {
+            if (filtered)
+            {
+                // TODO: Detect if the driver supports audio input
+            }
+
+            return new string[] { Constants.DefaultDeviceInputName };
+        }
+
+        /// <summary>
+        /// Open a new <see cref="AudioInputSystem"/>.
+        /// </summary>
+        /// <param name="outputDeviceName">The output device name selected by the <see cref="AudioInputSystem"/></param>
+        /// <param name="outputConfiguration">The output audio configuration selected by the <see cref="AudioInputSystem"/></param>
+        /// <param name="obj">The new <see cref="AudioInputSystem"/></param>
+        /// <param name="memoryManager">The memory manager that will be used for all guest memory operations</param>
+        /// <param name="inputDeviceName">The input device name wanted by the user</param>
+        /// <param name="sampleFormat">The sample format to use</param>
+        /// <param name="parameter">The user configuration</param>
+        /// <param name="appletResourceUserId">The applet resource user id of the application</param>
+        /// <param name="processHandle">The process handle of the application</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode OpenAudioIn(out string outputDeviceName,
+                                      out AudioOutputConfiguration outputConfiguration,
+                                      out AudioInputSystem obj,
+                                      IVirtualMemoryManager memoryManager,
+                                      string inputDeviceName,
+                                      SampleFormat sampleFormat,
+                                      ref AudioInputConfiguration parameter,
+                                      ulong appletResourceUserId,
+                                      uint processHandle)
+        {
+            int sessionId = AcquireSessionId();
+
+            _sessionsBufferEvents[sessionId].Clear();
+
+            IHardwareDeviceSession deviceSession = _deviceDriver.OpenDeviceSession(IHardwareDeviceDriver.Direction.Input, memoryManager, sampleFormat, parameter.SampleRate, parameter.ChannelCount);
+
+            AudioInputSystem audioIn = new AudioInputSystem(this, _lock, deviceSession, _sessionsBufferEvents[sessionId]);
+
+            ResultCode result = audioIn.Initialize(inputDeviceName, sampleFormat, ref parameter, sessionId);
+
+            if (result == ResultCode.Success)
+            {
+                outputDeviceName = audioIn.DeviceName;
+                outputConfiguration = new AudioOutputConfiguration
+                {
+                    ChannelCount  = audioIn.ChannelCount,
+                    SampleFormat  = audioIn.SampleFormat,
+                    SampleRate    = audioIn.SampleRate,
+                    AudioOutState = audioIn.GetState(),
+                };
+
+                obj = audioIn;
+
+                Register(audioIn);
+            }
+            else
+            {
+                ReleaseSessionId(sessionId);
+
+                obj = null;
+                outputDeviceName = null;
+                outputConfiguration = default;
+            }
+
+            return result;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                // Nothing to do here.
+            }
+        }
+    }
+}

Ryujinx.Audio/Input/AudioInputSystem.cs

@@ -0,0 +1,400 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using System;
+
+namespace Ryujinx.Audio.Input
+{
+    /// <summary>
+    /// Audio input system.
+    /// </summary>
+    public class AudioInputSystem : IDisposable
+    {
+        /// <summary>
+        /// The session id associated to the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        private int _sessionId;
+
+        /// <summary>
+        /// The session the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        private AudioDeviceSession _session;
+
+        /// <summary>
+        /// The target device name of the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        public string DeviceName { get; private set; }
+
+        /// <summary>
+        /// The target sample rate of the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        public uint SampleRate { get; private set; }
+
+        /// <summary>
+        /// The target channel count of the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        public uint ChannelCount { get; private set; }
+
+        /// <summary>
+        /// The target sample format of the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        public SampleFormat SampleFormat { get; private set; }
+
+        /// <summary>
+        /// The <see cref="AudioInputManager"/> owning this.
+        /// </summary>
+        private AudioInputManager _manager;
+
+        /// <summary>
+        /// THe lock of the parent.
+        /// </summary>
+        private object _parentLock;
+
+        /// <summary>
+        /// Create a new <see cref="AudioInputSystem"/>.
+        /// </summary>
+        /// <param name="manager">The manager instance</param>
+        /// <param name="parentLock">The lock of the manager</param>
+        /// <param name="deviceSession">The hardware device session</param>
+        /// <param name="bufferEvent">The buffer release event of the audio input</param>
+        public AudioInputSystem(AudioInputManager manager, object parentLock, IHardwareDeviceSession deviceSession, IWritableEvent bufferEvent)
+        {
+            _manager = manager;
+            _parentLock = parentLock;
+            _session = new AudioDeviceSession(deviceSession, bufferEvent);
+        }
+
+        /// <summary>
+        /// Get the default device name on the system.
+        /// </summary>
+        /// <returns>The default device name on the system.</returns>
+        private static string GetDeviceDefaultName()
+        {
+            return Constants.DefaultDeviceInputName;
+        }
+
+        /// <summary>
+        /// Check if a given configuration and device name is valid on the system.
+        /// </summary>
+        /// <param name="configuration">The configuration to check.</param>
+        /// <param name="deviceName">The device name to check.</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        private static ResultCode IsConfigurationValid(ref AudioInputConfiguration configuration, string deviceName)
+        {
+            if (deviceName.Length != 0 && !deviceName.Equals(GetDeviceDefaultName()))
+            {
+                return ResultCode.DeviceNotFound;
+            }
+            else if (configuration.SampleRate != 0 && configuration.SampleRate != Constants.TargetSampleRate)
+            {
+                return ResultCode.UnsupportedSampleRate;
+            }
+            else if (configuration.ChannelCount != 0 && configuration.ChannelCount != 1 && configuration.ChannelCount != 2 && configuration.ChannelCount != 6)
+            {
+                return ResultCode.UnsupportedChannelConfiguration;
+            }
+
+            return ResultCode.Success;
+        }
+
+        /// <summary>
+        /// Get the released buffer event.
+        /// </summary>
+        /// <returns>The released buffer event</returns>
+        public IWritableEvent RegisterBufferEvent()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetBufferEvent();
+            }
+        }
+
+        /// <summary>
+        /// Update the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        public void Update()
+        {
+            lock (_parentLock)
+            {
+                _session.Update();
+            }
+        }
+
+        /// <summary>
+        /// Get the id of this session.
+        /// </summary>
+        /// <returns>The id of this session</returns>
+        public int GetSessionId()
+        {
+            return _sessionId;
+        }
+
+        /// <summary>
+        /// Initialize the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        /// <param name="inputDeviceName">The input device name wanted by the user</param>
+        /// <param name="sampleFormat">The sample format to use</param>
+        /// <param name="parameter">The user configuration</param>
+        /// <param name="sessionId">The session id associated to this <see cref="AudioInputSystem"/></param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        public ResultCode Initialize(string inputDeviceName, SampleFormat sampleFormat, ref AudioInputConfiguration parameter, int sessionId)
+        {
+            _sessionId = sessionId;
+
+            ResultCode result = IsConfigurationValid(ref parameter, inputDeviceName);
+
+            if (result == ResultCode.Success)
+            {
+                if (inputDeviceName.Length == 0)
+                {
+                    DeviceName = GetDeviceDefaultName();
+                }
+                else
+                {
+                    DeviceName = inputDeviceName;
+                }
+
+                if (parameter.ChannelCount == 6)
+                {
+                    ChannelCount = 6;
+                }
+                else
+                {
+                    ChannelCount = 2;
+                }
+
+                SampleFormat = sampleFormat;
+                SampleRate = Constants.TargetSampleRate;
+            }
+
+            return result;
+        }
+
+        /// <summary>
+        /// Append a new audio buffer to the audio input.
+        /// </summary>
+        /// <param name="bufferTag">The unique tag of this buffer.</param>
+        /// <param name="userBuffer">The buffer informations.</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        public ResultCode AppendBuffer(ulong bufferTag, ref AudioUserBuffer userBuffer)
+        {
+            lock (_parentLock)
+            {
+                AudioBuffer buffer = new AudioBuffer
+                {
+                    BufferTag = bufferTag,
+                    DataPointer = userBuffer.Data,
+                    DataSize = userBuffer.DataSize
+                };
+
+                if (_session.AppendBuffer(buffer))
+                {
+                    return ResultCode.Success;
+                }
+
+                return ResultCode.BufferRingFull;
+            }
+        }
+
+        /// <summary>
+        /// Append a new audio buffer to the audio input.
+        /// </summary>
+        /// <remarks>This is broken by design, only added for completness.</remarks>
+        /// <param name="bufferTag">The unique tag of this buffer.</param>
+        /// <param name="userBuffer">The buffer informations.</param>
+        /// <param name="handle">Some unknown handle.</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        public ResultCode AppendUacBuffer(ulong bufferTag, ref AudioUserBuffer userBuffer, uint handle)
+        {
+            lock (_parentLock)
+            {
+                AudioBuffer buffer = new AudioBuffer
+                {
+                    BufferTag = bufferTag,
+                    DataPointer = userBuffer.Data,
+                    DataSize = userBuffer.DataSize
+                };
+
+                if (_session.AppendUacBuffer(buffer, handle))
+                {
+                    return ResultCode.Success;
+                }
+
+                return ResultCode.BufferRingFull;
+            }
+        }
+
+        /// <summary>
+        /// Get the release buffers.
+        /// </summary>
+        /// <param name="releasedBuffers">The buffer to write the release buffers</param>
+        /// <param name="releasedCount">The count of released buffers</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        public ResultCode GetReleasedBuffers(Span<ulong> releasedBuffers, out uint releasedCount)
+        {
+            releasedCount = 0;
+
+            // Ensure that the first entry is set to zero if no entries are returned.
+            if (releasedBuffers.Length > 0)
+            {
+                releasedBuffers[0] = 0;
+            }
+
+            lock (_parentLock)
+            {
+                for (int i = 0; i < releasedBuffers.Length; i++)
+                {
+                    if (!_session.TryPopReleasedBuffer(out AudioBuffer buffer))
+                    {
+                        break;
+                    }
+
+                    releasedBuffers[i] = buffer.BufferTag;
+                    releasedCount++;
+                }
+            }
+
+            return ResultCode.Success;
+        }
+
+        /// <summary>
+        /// Get the current state of the <see cref="AudioInputSystem"/>.
+        /// </summary>
+        /// <returns>Return the curent sta\te of the <see cref="AudioInputSystem"/></returns>
+        public AudioDeviceState GetState()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetState();
+            }
+        }
+
+        /// <summary>
+        /// Start the audio session.
+        /// </summary>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode Start()
+        {
+            lock (_parentLock)
+            {
+                return _session.Start();
+            }
+        }
+
+        /// <summary>
+        /// Stop the audio session.
+        /// </summary>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode Stop()
+        {
+            lock (_parentLock)
+            {
+                return _session.Stop();
+            }
+        }
+
+        /// <summary>
+        /// Get the volume of the session.
+        /// </summary>
+        /// <returns>The volume of the session</returns>
+        public float GetVolume()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetVolume();
+            }
+        }
+
+        /// <summary>
+        /// Set the volume of the session.
+        /// </summary>
+        /// <param name="volume">The new volume to set</param>
+        public void SetVolume(float volume)
+        {
+            lock (_parentLock)
+            {
+                _session.SetVolume(volume);
+            }
+        }
+
+        /// <summary>
+        /// Get the count of buffer currently in use (server + driver side).
+        /// </summary>
+        /// <returns>The count of buffer currently in use</returns>
+        public uint GetBufferCount()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetBufferCount();
+            }
+        }
+
+        /// <summary>
+        /// Check if a buffer is present.
+        /// </summary>
+        /// <param name="bufferTag">The unique tag of the buffer</param>
+        /// <returns>Return true if a buffer is present</returns>
+        public bool ContainsBuffer(ulong bufferTag)
+        {
+            lock (_parentLock)
+            {
+                return _session.ContainsBuffer(bufferTag);
+            }
+        }
+
+        /// <summary>
+        /// Get the count of sample played in this session.
+        /// </summary>
+        /// <returns>The count of sample played in this session</returns>
+        public ulong GetPlayedSampleCount()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetPlayedSampleCount();
+            }
+        }
+
+        /// <summary>
+        /// Flush all buffers to the initial state.
+        /// </summary>
+        /// <returns>True if any buffers was flushed</returns>
+        public bool FlushBuffers()
+        {
+            lock (_parentLock)
+            {
+                return _session.FlushBuffers();
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _session.Dispose();
+
+                _manager.Unregister(this);
+            }
+        }
+    }
+}

Ryujinx.Audio/Integration/HardwareDeviceImpl.cs

@@ -0,0 +1,82 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Integration
+{
+    public class HardwareDeviceImpl : IHardwareDevice
+    {
+        private IHardwareDeviceSession _session;
+        private uint _channelCount;
+        private uint _sampleRate;
+        private uint _currentBufferTag;
+
+        private byte[] _buffer;
+
+        public HardwareDeviceImpl(IHardwareDeviceDriver deviceDriver, uint channelCount, uint sampleRate)
+        {
+            _session = deviceDriver.OpenDeviceSession(IHardwareDeviceDriver.Direction.Output, null, SampleFormat.PcmInt16, sampleRate, channelCount);
+            _channelCount = channelCount;
+            _sampleRate = sampleRate;
+            _currentBufferTag = 0;
+
+            _buffer = new byte[Constants.TargetSampleCount * channelCount * sizeof(ushort)];
+
+            _session.Start();
+        }
+
+        public void AppendBuffer(ReadOnlySpan<short> data, uint channelCount)
+        {
+            data.CopyTo(MemoryMarshal.Cast<byte, short>(_buffer));
+
+            _session.QueueBuffer(new AudioBuffer
+            {
+                DataPointer = _currentBufferTag++,
+                Data        = _buffer,
+                DataSize    = (ulong)_buffer.Length,
+            });
+
+            _currentBufferTag = _currentBufferTag % 4;
+        }
+
+        public uint GetChannelCount()
+        {
+            return _channelCount;
+        }
+
+        public uint GetSampleRate()
+        {
+            return _sampleRate;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _session.Dispose();
+            }
+        }
+    }
+}

Ryujinx.Audio/Integration/IHardwareDevice.cs

@@ -0,0 +1,60 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Integration
+{
+    /// <summary>
+    /// Represent an hardware device used in <see cref="Renderer.Dsp.Command.DeviceSinkCommand"/>
+    /// </summary>
+    public interface IHardwareDevice : IDisposable
+    {
+        /// <summary>
+        /// Get the supported sample rate of this device.
+        /// </summary>
+        /// <returns>The supported sample rate of this device.</returns>
+        uint GetSampleRate();
+
+        /// <summary>
+        /// Get the channel count supported by this device.
+        /// </summary>
+        /// <returns>The channel count supported by this device.</returns>
+        uint GetChannelCount();
+
+        /// <summary>
+        /// Appends new PCM16 samples to the device.
+        /// </summary>
+        /// <param name="data">The new PCM16 samples.</param>
+        /// <param name="channelCount">The number of channels.</param>
+        void AppendBuffer(ReadOnlySpan<short> data, uint channelCount);
+
+        /// <summary>
+        /// Check if the audio renderer needs to perform downmixing.
+        /// </summary>
+        /// <returns>True if downmixing is needed.</returns>
+        public bool NeedDownmixing()
+        {
+            uint channelCount = GetChannelCount();
+
+            Debug.Assert(channelCount > 0 && channelCount <= Constants.ChannelCountMax);
+
+            return channelCount != Constants.ChannelCountMax;
+        }
+    }
+}

Ryujinx.Audio/Integration/IHardwareDeviceDriver.cs

@@ -0,0 +1,50 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Memory;
+using System;
+using System.Threading;
+
+namespace Ryujinx.Audio.Integration
+{
+    /// <summary>
+    /// Represent an hardware device driver used in <see cref="Output.AudioOutputSystem"/>.
+    /// </summary>
+    public interface IHardwareDeviceDriver : IDisposable
+    {
+        public enum Direction
+        {
+            Input,
+            Output
+        }
+
+        IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount);
+
+        ManualResetEvent GetUpdateRequiredEvent();
+
+        bool SupportsDirection(Direction direction);
+        bool SupportsSampleRate(uint sampleRate);
+        bool SupportsSampleFormat(SampleFormat sampleFormat);
+        bool SupportsChannelCount(uint channelCount);
+
+        IHardwareDeviceDriver GetRealDeviceDriver()
+        {
+            return this;
+        }
+    }
+}

Ryujinx.Audio/Integration/IHardwareDeviceSession.cs

@@ -0,0 +1,45 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using System;
+
+namespace Ryujinx.Audio.Integration
+{
+    public interface IHardwareDeviceSession : IDisposable
+    {
+        bool RegisterBuffer(AudioBuffer buffer);
+
+        void UnregisterBuffer(AudioBuffer buffer);
+
+        void QueueBuffer(AudioBuffer buffer);
+
+        bool WasBufferFullyConsumed(AudioBuffer buffer);
+
+        void SetVolume(float volume);
+
+        float GetVolume();
+
+        ulong GetPlayedSampleCount();
+
+        void Start();
+
+        void Stop();
+
+        void PrepareToClose();
+    }
+}

Ryujinx.Audio/Integration/IWritableEvent.cs

@@ -0,0 +1,35 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Integration
+{
+    /// <summary>
+    /// Represent a writable event with manual clear.
+    /// </summary>
+    public interface IWritableEvent
+    {
+        /// <summary>
+        /// Signal the event.
+        /// </summary>
+        void Signal();
+
+        /// <summary>
+        /// Clear the signaled state of the event.
+        /// </summary>
+        void Clear();
+    }
+}

Ryujinx.Audio/LICENSE.txt

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

Ryujinx.Audio/Native/libsoundio/MarshalExtensions.cs

@@ -1,38 +0,0 @@
-using System;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public static class MarshalEx
-    {
-        public static double ReadDouble(IntPtr handle, int offset = 0)
-        {
-            return BitConverter.Int64BitsToDouble(Marshal.ReadInt64(handle, offset));
-        }
-
-        public static void WriteDouble(IntPtr handle, double value)
-        {
-            WriteDouble(handle, 0, value);
-        }
-
-        public static void WriteDouble(IntPtr handle, int offset, double value)
-        {
-            Marshal.WriteInt64(handle, offset, BitConverter.DoubleToInt64Bits(value));
-        }
-
-        public static float ReadFloat(IntPtr handle, int offset = 0)
-        {
-            return BitConverter.Int32BitsToSingle(Marshal.ReadInt32(handle, offset));
-        }
-
-        public static void WriteFloat(IntPtr handle, float value)
-        {
-            WriteFloat(handle, 0, value);
-        }
-
-        public static void WriteFloat(IntPtr handle, int offset, float value)
-        {
-            Marshal.WriteInt32(handle, offset, BitConverter.SingleToInt32Bits(value));
-        }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIO.cs

@@ -1,386 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public class SoundIO : IDisposable
-    {
-        Pointer<SoundIo> handle;
-
-        public SoundIO()
-        {
-            handle = Natives.soundio_create();
-        }
-
-        internal SoundIO(Pointer<SoundIo> handle)
-        {
-            this.handle = handle;
-        }
-
-        public void Dispose ()
-        {
-            foreach (var h in allocated_hglobals)
-            {
-                Marshal.FreeHGlobal(h);
-            }
-
-            Natives.soundio_destroy(handle);
-        }
-
-        // Equality (based on handle)
-
-        public override bool Equals(object other)
-        {
-            var d = other as SoundIO;
-
-            return d != null && this.handle == d.handle;
-        }
-
-        public override int GetHashCode()
-        {
-            return (int)(IntPtr)handle;
-        }
-
-        public static bool operator == (SoundIO obj1, SoundIO obj2)
-        {
-            return obj1 is null ? obj2 is null : obj1.Equals(obj2);
-        }
-
-        public static bool operator != (SoundIO obj1, SoundIO obj2)
-        {
-            return obj1 is null ? obj2 is object : !obj1.Equals(obj2);
-        }
-
-        // fields
-
-        // FIXME: this should be taken care in more centralized/decent manner... we don't want to write
-        // this kind of code anywhere we need string marshaling.
-        List<IntPtr> allocated_hglobals = new List<IntPtr>();
-
-        public string ApplicationName {
-            get { return Marshal.PtrToStringAnsi(Marshal.ReadIntPtr(handle, app_name_offset)); }
-            set
-            {
-                unsafe
-                {
-                    var existing = Marshal.ReadIntPtr(handle, app_name_offset);
-                    if (allocated_hglobals.Contains (existing))
-                    {
-                        allocated_hglobals.Remove(existing);
-                        Marshal.FreeHGlobal(existing);
-                    }
-
-                    var ptr = Marshal.StringToHGlobalAnsi(value);
-                    Marshal.WriteIntPtr(handle, app_name_offset, ptr);
-                    allocated_hglobals.Add(ptr);
-                }
-            }
-        }
-
-        static readonly int app_name_offset = (int)Marshal.OffsetOf<SoundIo>("app_name");
-
-        public SoundIOBackend CurrentBackend
-        {
-            get { return (SoundIOBackend)Marshal.ReadInt32(handle, current_backend_offset); }
-        }
-
-        static readonly int current_backend_offset = (int)Marshal.OffsetOf<SoundIo>("current_backend");
-
-        // emit_rtprio_warning
-        public Action EmitRealtimePriorityWarning
-        {
-            get { return emit_rtprio_warning; }
-            set
-            {
-                emit_rtprio_warning = value;
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(on_devices_change);
-
-                Marshal.WriteIntPtr(handle, emit_rtprio_warning_offset, ptr);
-            }
-        }
-
-        static readonly int emit_rtprio_warning_offset = (int)Marshal.OffsetOf<SoundIo>("emit_rtprio_warning");
-
-        Action emit_rtprio_warning;
-
-        // jack_error_callback
-        public Action<string> JackErrorCallback
-        {
-            get { return jack_error_callback; }
-            set
-            {
-                jack_error_callback = value;
-                if (value == null)
-                {
-                    jack_error_callback = null;
-                }
-                else
-                {
-                    jack_error_callback_native = msg => jack_error_callback(msg);
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(jack_error_callback_native);
-                Marshal.WriteIntPtr(handle, jack_error_callback_offset, ptr);
-            }
-        }
-
-        static readonly int jack_error_callback_offset = (int)Marshal.OffsetOf<SoundIo>("jack_error_callback");
-
-        Action<string> jack_error_callback;
-        delegate void jack_error_delegate(string message);
-        jack_error_delegate jack_error_callback_native;
-
-        // jack_info_callback
-        public Action<string> JackInfoCallback
-        {
-            get { return jack_info_callback; }
-            set
-            {
-                jack_info_callback = value;
-                if (value == null)
-                {
-                    jack_info_callback = null;
-                }
-                else
-                {
-                    jack_info_callback_native = msg => jack_info_callback(msg);
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(jack_info_callback_native);
-                Marshal.WriteIntPtr(handle, jack_info_callback_offset, ptr);
-            }
-        }
-
-        static readonly int jack_info_callback_offset = (int)Marshal.OffsetOf<SoundIo>("jack_info_callback");
-
-        Action<string> jack_info_callback;
-        delegate void jack_info_delegate(string message);
-        jack_info_delegate jack_info_callback_native;
-
-        // on_backend_disconnect
-        public Action<int> OnBackendDisconnect
-        {
-            get { return on_backend_disconnect; }
-            set
-            {
-                on_backend_disconnect = value;
-                if (value == null)
-                {
-                    on_backend_disconnect_native = null;
-                }
-                else
-                {
-                    on_backend_disconnect_native = (sio, err) => on_backend_disconnect(err);
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(on_backend_disconnect_native);
-                Marshal.WriteIntPtr(handle, on_backend_disconnect_offset, ptr);
-            }
-        }
-
-        static readonly int on_backend_disconnect_offset = (int)Marshal.OffsetOf<SoundIo>("on_backend_disconnect");
-
-        Action<int> on_backend_disconnect;
-        delegate void on_backend_disconnect_delegate(IntPtr handle, int errorCode);
-        on_backend_disconnect_delegate on_backend_disconnect_native;
-
-        // on_devices_change
-        public Action OnDevicesChange
-        {
-            get { return on_devices_change; }
-            set
-            {
-                on_devices_change = value;
-                if (value == null)
-                {
-                    on_devices_change_native = null;
-                }
-                else
-                {
-                    on_devices_change_native = sio => on_devices_change();
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(on_devices_change_native);
-                Marshal.WriteIntPtr(handle, on_devices_change_offset, ptr);
-            }
-        }
-
-        static readonly int on_devices_change_offset = (int)Marshal.OffsetOf<SoundIo>("on_devices_change");
-
-        Action on_devices_change;
-        delegate void on_devices_change_delegate(IntPtr handle);
-        on_devices_change_delegate on_devices_change_native;
-
-        // on_events_signal
-        public Action OnEventsSignal
-        {
-            get { return on_events_signal; }
-            set
-            {
-                on_events_signal = value;
-                if (value == null)
-                {
-                    on_events_signal_native = null;
-                }
-                else
-                {
-                    on_events_signal_native = sio => on_events_signal();
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(on_events_signal_native);
-                Marshal.WriteIntPtr(handle, on_events_signal_offset, ptr);
-            }
-        }
-
-        static readonly int on_events_signal_offset = (int)Marshal.OffsetOf<SoundIo>("on_events_signal");
-
-        Action on_events_signal;
-        delegate void on_events_signal_delegate(IntPtr handle);
-        on_events_signal_delegate on_events_signal_native;
-
-
-        // functions
-
-        public int BackendCount
-        {
-            get { return Natives.soundio_backend_count(handle); }
-        }
-
-        public int InputDeviceCount
-        {
-            get { return Natives.soundio_input_device_count(handle); }
-        }
-
-        public int OutputDeviceCount
-        {
-            get { return Natives.soundio_output_device_count(handle); }
-        }
-
-        public int DefaultInputDeviceIndex
-        {
-            get { return Natives.soundio_default_input_device_index(handle); }
-        }
-
-        public int DefaultOutputDeviceIndex
-        {
-            get { return Natives.soundio_default_output_device_index(handle); }
-        }
-
-        public SoundIOBackend GetBackend(int index)
-        {
-            return (SoundIOBackend)Natives.soundio_get_backend(handle, index);
-        }
-
-        public SoundIODevice GetInputDevice(int index)
-        {
-            return new SoundIODevice(Natives.soundio_get_input_device(handle, index));
-        }
-
-        public SoundIODevice GetOutputDevice(int index)
-        {
-            return new SoundIODevice(Natives.soundio_get_output_device(handle, index));
-        }
-
-        public void Connect()
-        {
-            var ret = (SoundIoError)Natives.soundio_connect(handle);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public void ConnectBackend(SoundIOBackend backend)
-        {
-            var ret = (SoundIoError)Natives.soundio_connect_backend(handle, (SoundIoBackend)backend);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public void Disconnect()
-        {
-            Natives.soundio_disconnect(handle);
-        }
-
-        public void FlushEvents()
-        {
-            Natives.soundio_flush_events(handle);
-        }
-
-        public void WaitEvents()
-        {
-            Natives.soundio_wait_events(handle);
-        }
-
-        public void Wakeup()
-        {
-            Natives.soundio_wakeup(handle);
-        }
-
-        public void ForceDeviceScan()
-        {
-            Natives.soundio_force_device_scan(handle);
-        }
-
-        public SoundIORingBuffer CreateRingBuffer(int capacity)
-        {
-            return new SoundIORingBuffer(Natives.soundio_ring_buffer_create(handle, capacity));
-        }
-
-        // static methods
-
-        public static string VersionString
-        {
-            get { return Marshal.PtrToStringAnsi(Natives.soundio_version_string()); }
-        }
-
-        public static int VersionMajor
-        {
-            get { return Natives.soundio_version_major(); }
-        }
-
-        public static int VersionMinor
-        {
-            get { return Natives.soundio_version_minor(); }
-        }
-
-        public static int VersionPatch
-        {
-            get { return Natives.soundio_version_patch(); }
-        }
-
-        public static string GetBackendName(SoundIOBackend backend)
-        {
-            return Marshal.PtrToStringAnsi(Natives.soundio_backend_name((SoundIoBackend)backend));
-        }
-
-        public static bool HaveBackend(SoundIOBackend backend)
-        {
-            return Natives.soundio_have_backend((SoundIoBackend)backend);
-        }
-
-        public static int GetBytesPerSample(SoundIOFormat format)
-        {
-            return Natives.soundio_get_bytes_per_sample((SoundIoFormat)format);
-        }
-
-        public static int GetBytesPerFrame(SoundIOFormat format, int channelCount)
-        {
-            return Natives.soundio_get_bytes_per_frame((SoundIoFormat)format, channelCount);
-        }
-
-        public static int GetBytesPerSecond(SoundIOFormat format, int channelCount, int sampleRate)
-        {
-            return Natives.soundio_get_bytes_per_second((SoundIoFormat)format, channelCount, sampleRate);
-        }
-
-        public static string GetSoundFormatName(SoundIOFormat format)
-        {
-            return Marshal.PtrToStringAnsi(Natives.soundio_format_string((SoundIoFormat)format));
-        }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOBackend.cs

@@ -1,13 +0,0 @@
-namespace SoundIOSharp
-{
-    public enum SoundIOBackend
-    {
-        None,
-        Jack,
-        PulseAudio,
-        Alsa,
-        CoreAudio,
-        Wasapi,
-        Dummy
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOChannelArea.cs

@@ -1,30 +0,0 @@
-using System;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public struct SoundIOChannelArea
-    {
-        internal SoundIOChannelArea(Pointer<SoundIoChannelArea> handle)
-        {
-            this.handle = handle;
-        }
-
-        Pointer<SoundIoChannelArea> handle;
-
-        public IntPtr Pointer
-        {
-            get { return Marshal.ReadIntPtr(handle, ptr_offset); }
-            set { Marshal.WriteIntPtr(handle, ptr_offset, value); }
-        }
-
-        static readonly int ptr_offset = (int)Marshal.OffsetOf<SoundIoChannelArea>("ptr");
-
-        public int Step
-        {
-            get { return Marshal.ReadInt32(handle, step_offset); }
-        }
-
-        static readonly int step_offset = (int)Marshal.OffsetOf<SoundIoChannelArea>("step");
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOChannelAreas.cs

@@ -1,34 +0,0 @@
-using System;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public struct SoundIOChannelAreas
-    {
-        static readonly int native_size = Marshal.SizeOf<SoundIoChannelArea>();
-
-        internal SoundIOChannelAreas(IntPtr head, int channelCount, int frameCount)
-        {
-            this.head          = head;
-            this.channel_count = channelCount;
-            this.frame_count   = frameCount;
-        }
-
-        IntPtr head;
-        int    channel_count;
-        int    frame_count;
-
-        public bool IsEmpty
-        {
-            get { return head == IntPtr.Zero; }
-        }
-
-        public SoundIOChannelArea GetArea(int channel)
-        {
-            return new SoundIOChannelArea(head + native_size * channel);
-        }
-
-        public int ChannelCount => channel_count;
-        public int FrameCount => frame_count;
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOChannelId.cs

@@ -1,75 +0,0 @@
-namespace SoundIOSharp
-{
-    public enum SoundIOChannelId
-    {
-        Invalid,
-        FrontLeft,
-        FrontRight,
-        FrontCenter,
-        Lfe,
-        BackLeft,
-        BackRight,
-        FrontLeftCenter,
-        FrontRightCenter,
-        BackCenter,
-        SideLeft,
-        SideRight,
-        TopCenter,
-        TopFrontLeft,
-        TopFrontCenter,
-        TopFrontRight,
-        TopBackLeft,
-        TopBackCenter,
-        TopBackRight,
-        BackLeftCenter,
-        BackRightCenter,
-        FrontLeftWide,
-        FrontRightWide,
-        FrontLeftHigh,
-        FrontCenterHigh,
-        FrontRightHigh,
-        TopFrontLeftCenter,
-        TopFrontRightCenter,
-        TopSideLeft,
-        TopSideRight,
-        LeftLfe,
-        RightLfe,
-        Lfe2,
-        BottomCenter,
-        BottomLeftCenter,
-        BottomRightCenter,
-        MsMid,
-        MsSide,
-        AmbisonicW,
-        AmbisonicX,
-        AmbisonicY,
-        AmbisonicZ,
-        XyX,
-        XyY,
-        HeadphonesLeft,
-        HeadphonesRight,
-        ClickTrack,
-        ForeignLanguage,
-        HearingImpaired,
-        Narration,
-        Haptic,
-        DialogCentricMix,
-        Aux,
-        Aux0,
-        Aux1,
-        Aux2,
-        Aux3,
-        Aux4,
-        Aux5,
-        Aux6,
-        Aux7,
-        Aux8,
-        Aux9,
-        Aux10,
-        Aux11,
-        Aux12,
-        Aux13,
-        Aux14,
-        Aux15
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOChannelLayout.cs

@@ -1,116 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public struct SoundIOChannelLayout
-    {
-        public static int BuiltInCount
-        {
-            get { return Natives.soundio_channel_layout_builtin_count(); }
-        }
-
-        public static SoundIOChannelLayout GetBuiltIn(int index)
-        {
-            return new SoundIOChannelLayout(Natives.soundio_channel_layout_get_builtin(index));
-        }
-
-        public static SoundIOChannelLayout GetDefault(int channelCount)
-        {
-            var handle = Natives.soundio_channel_layout_get_default(channelCount);
-
-            return new SoundIOChannelLayout (handle);
-        }
-
-        public static SoundIOChannelId ParseChannelId(string name)
-        {
-            var ptr = Marshal.StringToHGlobalAnsi(name);
-
-            try 
-            {
-                return (SoundIOChannelId)Natives.soundio_parse_channel_id(ptr, name.Length);
-            }
-            finally
-            {
-                Marshal.FreeHGlobal(ptr);
-            }
-        }
-
-        // instance members
-
-        internal SoundIOChannelLayout(Pointer<SoundIoChannelLayout> handle)
-        {
-            this.handle = handle;
-        }
-
-        readonly Pointer<SoundIoChannelLayout> handle;
-
-        public bool IsNull
-        {
-            get { return handle.Handle == IntPtr.Zero; }
-        }
-
-        internal IntPtr Handle
-        {
-            get { return handle; }
-        }
-
-        public int ChannelCount
-        {
-            get { return IsNull ? 0 : Marshal.ReadInt32((IntPtr)handle + channel_count_offset); }
-        }
-
-        static readonly int channel_count_offset = (int)Marshal.OffsetOf<SoundIoChannelLayout>("channel_count");
-
-        public string Name
-        {
-            get { return IsNull ? null : Marshal.PtrToStringAnsi(Marshal.ReadIntPtr((IntPtr)handle + name_offset)); }
-        }
-
-        static readonly int name_offset = (int)Marshal.OffsetOf<SoundIoChannelLayout>("name");
-
-        public IEnumerable<SoundIOChannelId> Channels
-        {
-            get
-            {
-                if (IsNull) yield break;
-
-                for (int i = 0; i < 24; i++)
-                {
-                    yield return (SoundIOChannelId)Marshal.ReadInt32((IntPtr)handle + channels_offset + sizeof(SoundIoChannelId) * i);
-                }
-            }
-        }
-
-        static readonly int channels_offset = (int)Marshal.OffsetOf<SoundIoChannelLayout>("channels");
-
-        public override bool Equals(object other)
-        {
-            if (!(other is SoundIOChannelLayout)) return false;
-
-            var s = (SoundIOChannelLayout) other;
-
-            return handle == s.handle || Natives.soundio_channel_layout_equal(handle, s.handle);
-        }
-
-        public override int GetHashCode()
-        {
-            return handle.GetHashCode();
-        }
-
-        public string DetectBuiltInName()
-        {
-            if (IsNull) throw new InvalidOperationException();
-
-            return Natives.soundio_channel_layout_detect_builtin(handle) ? Name : null;
-        }
-
-        public int FindChannel(SoundIOChannelId channel)
-        {
-            if (IsNull) throw new InvalidOperationException();
-
-            return Natives.soundio_channel_layout_find_channel(handle, (SoundIoChannelId)channel);
-        }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIODevice.cs

@@ -1,267 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public class SoundIODevice
-    {
-        public static SoundIOChannelLayout BestMatchingChannelLayout(SoundIODevice device1, SoundIODevice device2)
-        {
-            var ptr1 = Marshal.ReadIntPtr(device1.handle, layouts_offset);
-            var ptr2 = Marshal.ReadIntPtr(device2.handle, layouts_offset);
-
-            return new SoundIOChannelLayout(Natives.soundio_best_matching_channel_layout(ptr1, device1.LayoutCount, ptr2, device2.LayoutCount));
-        }
-
-        internal SoundIODevice(Pointer<SoundIoDevice> handle)
-        {
-            this.handle = handle;
-        }
-
-        readonly Pointer<SoundIoDevice> handle;
-
-        // Equality (based on handle and native func)
-
-        public override bool Equals(object other)
-        {
-            var d = other as SoundIODevice;
-
-            return d != null && (this.handle == d.handle || Natives.soundio_device_equal (this.handle, d.handle));
-        }
-
-        public override int GetHashCode()
-        {
-            return (int)(IntPtr)handle;
-        }
-
-        public static bool operator == (SoundIODevice obj1, SoundIODevice obj2)
-        {
-            return obj1 is null ? obj2 is null : obj1.Equals(obj2);
-        }
-
-        public static bool operator != (SoundIODevice obj1, SoundIODevice obj2)
-        {
-            return obj1 is null ? obj2 is object : !obj1.Equals(obj2);
-        }
-
-        // fields
-
-        public SoundIODeviceAim Aim
-        {
-            get { return (SoundIODeviceAim)Marshal.ReadInt32(handle, aim_offset); }
-        }
-
-        static readonly int aim_offset = (int)Marshal.OffsetOf<SoundIoDevice>("aim");
-
-        public SoundIOFormat CurrentFormat
-        {
-            get { return (SoundIOFormat)Marshal.ReadInt32(handle, current_format_offset); }
-        }
-
-        static readonly int current_format_offset = (int)Marshal.OffsetOf<SoundIoDevice>("current_format");
-
-        public SoundIOChannelLayout CurrentLayout
-        {
-            get { return new SoundIOChannelLayout((IntPtr)handle + current_layout_offset); }
-        }
-
-        static readonly int current_layout_offset = (int)Marshal.OffsetOf<SoundIoDevice>("current_layout");
-
-        public int FormatCount
-        {
-            get { return Marshal.ReadInt32(handle, format_count_offset); }
-        }
-
-        static readonly int format_count_offset = (int)Marshal.OffsetOf<SoundIoDevice>("format_count");
-
-        public IEnumerable<SoundIOFormat> Formats
-        {
-            get
-            {
-                var ptr = Marshal.ReadIntPtr(handle, formats_offset);
-
-                for (int i = 0; i < FormatCount; i++)
-                {
-                    yield return (SoundIOFormat)Marshal.ReadInt32(ptr, i);
-                }
-            }
-        }
-
-        static readonly int formats_offset = (int)Marshal.OffsetOf<SoundIoDevice>("formats");
-
-        public string Id
-        {
-            get { return Marshal.PtrToStringAnsi(Marshal.ReadIntPtr(handle, id_offset)); }
-        }
-
-        static readonly int id_offset = (int)Marshal.OffsetOf<SoundIoDevice>("id");
-
-        public bool IsRaw
-        {
-            get { return Marshal.ReadInt32(handle, is_raw_offset) != 0; }
-        }
-
-        static readonly int is_raw_offset = (int)Marshal.OffsetOf<SoundIoDevice>("is_raw");
-
-        public int LayoutCount
-        {
-            get { return Marshal.ReadInt32(handle, layout_count_offset); }
-        }
-
-        static readonly int layout_count_offset = (int)Marshal.OffsetOf<SoundIoDevice>("layout_count");
-
-        public IEnumerable<SoundIOChannelLayout> Layouts
-        {
-            get
-            {
-                var ptr = Marshal.ReadIntPtr (handle, layouts_offset);
-
-                for (int i = 0; i < LayoutCount; i++)
-                {
-                    yield return new SoundIOChannelLayout(ptr + i * Marshal.SizeOf<SoundIoChannelLayout>());
-                }
-            }
-        }
-
-        static readonly int layouts_offset = (int)Marshal.OffsetOf<SoundIoDevice>("layouts");
-
-        public string Name
-        {
-            get { return Marshal.PtrToStringAnsi(Marshal.ReadIntPtr(handle, name_offset)); }
-        }
-
-        static readonly int name_offset = (int)Marshal.OffsetOf<SoundIoDevice>("name");
-
-        public int ProbeError
-        {
-            get { return Marshal.ReadInt32(handle, probe_error_offset); }
-        }
-
-        static readonly int probe_error_offset = (int)Marshal.OffsetOf<SoundIoDevice>("probe_error");
-
-        public int ReferenceCount
-        {
-            get { return Marshal.ReadInt32(handle, ref_count_offset); }
-        }
-
-        static readonly int ref_count_offset = (int)Marshal.OffsetOf<SoundIoDevice>("ref_count");
-
-        public int SampleRateCount
-        {
-            get { return Marshal.ReadInt32(handle, sample_rate_count_offset); }
-        }
-
-        static readonly int sample_rate_count_offset = (int)Marshal.OffsetOf<SoundIoDevice>("sample_rate_count");
-
-        public IEnumerable<SoundIOSampleRateRange> SampleRates
-        {
-            get
-            {
-                var ptr = Marshal.ReadIntPtr(handle, sample_rates_offset);
-
-                for (int i = 0; i < SampleRateCount; i++)
-                {
-                    yield return new SoundIOSampleRateRange(Marshal.ReadInt32(ptr, i * 2), Marshal.ReadInt32(ptr, i * 2 + 1));
-                }
-            }
-        }
-
-        static readonly int sample_rates_offset = (int)Marshal.OffsetOf<SoundIoDevice>("sample_rates");
-
-        public double SoftwareLatencyCurrent
-        {
-            get { return MarshalEx.ReadDouble(handle, software_latency_current_offset); }
-            set { MarshalEx.WriteDouble(handle, software_latency_current_offset, value); }
-        }
-
-        static readonly int software_latency_current_offset = (int)Marshal.OffsetOf<SoundIoDevice>("software_latency_current");
-
-        public double SoftwareLatencyMin
-        {
-            get { return MarshalEx.ReadDouble(handle, software_latency_min_offset); }
-            set { MarshalEx.WriteDouble(handle, software_latency_min_offset, value); }
-        }
-
-        static readonly int software_latency_min_offset = (int)Marshal.OffsetOf<SoundIoDevice>("software_latency_min");
-
-        public double SoftwareLatencyMax
-        {
-            get { return MarshalEx.ReadDouble(handle, software_latency_max_offset); }
-            set { MarshalEx.WriteDouble(handle, software_latency_max_offset, value); }
-        }
-
-        static readonly int software_latency_max_offset = (int)Marshal.OffsetOf<SoundIoDevice>("software_latency_max");
-
-        public SoundIO SoundIO
-        {
-            get { return new SoundIO(Marshal.ReadIntPtr(handle, soundio_offset)); }
-        }
-
-        static readonly int soundio_offset = (int)Marshal.OffsetOf<SoundIoDevice>("soundio");
-
-        // functions
-
-        public void AddReference()
-        {
-            Natives.soundio_device_ref(handle);
-        }
-
-        public void RemoveReference()
-        {
-            Natives.soundio_device_unref(handle);
-        }
-
-        public void SortDeviceChannelLayouts()
-        {
-            Natives.soundio_device_sort_channel_layouts(handle);
-        }
-
-        public static readonly SoundIOFormat S16NE     =  BitConverter.IsLittleEndian ? SoundIOFormat.S16LE     : SoundIOFormat.S16BE;
-        public static readonly SoundIOFormat U16NE     =  BitConverter.IsLittleEndian ? SoundIOFormat.U16LE     : SoundIOFormat.U16BE;
-        public static readonly SoundIOFormat S24NE     =  BitConverter.IsLittleEndian ? SoundIOFormat.S24LE     : SoundIOFormat.S24BE;
-        public static readonly SoundIOFormat U24NE     =  BitConverter.IsLittleEndian ? SoundIOFormat.U24LE     : SoundIOFormat.U24BE;
-        public static readonly SoundIOFormat S32NE     =  BitConverter.IsLittleEndian ? SoundIOFormat.S32LE     : SoundIOFormat.S32BE;
-        public static readonly SoundIOFormat U32NE     =  BitConverter.IsLittleEndian ? SoundIOFormat.U32LE     : SoundIOFormat.U32BE;
-        public static readonly SoundIOFormat Float32NE =  BitConverter.IsLittleEndian ? SoundIOFormat.Float32LE : SoundIOFormat.Float32BE;
-        public static readonly SoundIOFormat Float64NE =  BitConverter.IsLittleEndian ? SoundIOFormat.Float64LE : SoundIOFormat.Float64BE;
-        public static readonly SoundIOFormat S16FE     = !BitConverter.IsLittleEndian ? SoundIOFormat.S16LE     : SoundIOFormat.S16BE;
-        public static readonly SoundIOFormat U16FE     = !BitConverter.IsLittleEndian ? SoundIOFormat.U16LE     : SoundIOFormat.U16BE;
-        public static readonly SoundIOFormat S24FE     = !BitConverter.IsLittleEndian ? SoundIOFormat.S24LE     : SoundIOFormat.S24BE;
-        public static readonly SoundIOFormat U24FE     = !BitConverter.IsLittleEndian ? SoundIOFormat.U24LE     : SoundIOFormat.U24BE;
-        public static readonly SoundIOFormat S32FE     = !BitConverter.IsLittleEndian ? SoundIOFormat.S32LE     : SoundIOFormat.S32BE;
-        public static readonly SoundIOFormat U32FE     = !BitConverter.IsLittleEndian ? SoundIOFormat.U32LE     : SoundIOFormat.U32BE;
-        public static readonly SoundIOFormat Float32FE = !BitConverter.IsLittleEndian ? SoundIOFormat.Float32LE : SoundIOFormat.Float32BE;
-        public static readonly SoundIOFormat Float64FE = !BitConverter.IsLittleEndian ? SoundIOFormat.Float64LE : SoundIOFormat.Float64BE;
-
-        public bool SupportsFormat(SoundIOFormat format)
-        {
-            return Natives.soundio_device_supports_format(handle, (SoundIoFormat)format);
-        }
-
-        public bool SupportsSampleRate(int sampleRate)
-        {
-            return Natives.soundio_device_supports_sample_rate(handle, sampleRate);
-        }
-
-        public bool SupportsChannelCount(int channelCount)
-        {
-            return Natives.soundio_device_supports_layout(handle, SoundIOChannelLayout.GetDefault(channelCount).Handle);
-        }
-
-        public int GetNearestSampleRate(int sampleRate)
-        {
-            return Natives.soundio_device_nearest_sample_rate(handle, sampleRate);
-        }
-
-        public SoundIOInStream CreateInStream()
-        {
-            return new SoundIOInStream(Natives.soundio_instream_create(handle));
-        }
-
-        public SoundIOOutStream CreateOutStream()
-        {
-            return new SoundIOOutStream(Natives.soundio_outstream_create(handle));
-        }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIODeviceAim.cs

@@ -1,8 +0,0 @@
-namespace SoundIOSharp
-{
-    public enum SoundIODeviceAim // soundio.h (228, 6)
-    {
-        Input,
-        Output
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOException.cs

@@ -1,10 +0,0 @@
-using System;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public class SoundIOException : Exception
-    {
-        internal SoundIOException(SoundIoError errorCode) : base (Marshal.PtrToStringAnsi(Natives.soundio_strerror((int) errorCode))) { }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOFormat.cs

@@ -1,25 +0,0 @@
-namespace SoundIOSharp
-{
-    public enum SoundIOFormat
-	{
-		Invalid,
-		S8,
-		U8,
-		S16LE,
-		S16BE,
-		U16LE,
-		U16BE,
-		S24LE,
-		S24BE,
-		U24LE,
-		U24BE,
-		S32LE,
-		S32BE,
-		U32LE,
-		U32BE,
-		Float32LE,
-		Float32BE,
-		Float64LE,
-		Float64BE
-	}
-}

Ryujinx.Audio/Native/libsoundio/SoundIOInStream.cs

@@ -1,293 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public class SoundIOInStream : IDisposable
-    {
-        internal SoundIOInStream(Pointer<SoundIoInStream> handle)
-        {
-            this.handle = handle;
-        }
-
-        Pointer<SoundIoInStream> handle;
-
-        public void Dispose()
-        {
-            Natives.soundio_instream_destroy(handle);
-        }
-
-        // Equality (based on handle)
-
-        public override bool Equals(object other)
-        {
-            var d = other as SoundIOInStream;
-
-            return d != null && (this.handle == d.handle);
-        }
-
-        public override int GetHashCode()
-        {
-            return (int)(IntPtr)handle;
-        }
-
-        public static bool operator == (SoundIOInStream obj1, SoundIOInStream obj2)
-        {
-            return obj1 is null ? obj2 is null : obj1.Equals(obj2);
-        }
-
-        public static bool operator != (SoundIOInStream obj1, SoundIOInStream obj2)
-        {
-            return obj1 is null ? obj2 is object : !obj1.Equals(obj2);
-        }
-
-        // fields
-
-        public SoundIODevice Device
-        {
-            get { return new SoundIODevice(Marshal.ReadIntPtr(handle, device_offset)); }
-        }
-
-        static readonly int device_offset = (int)Marshal.OffsetOf<SoundIoInStream>("device");
-
-        public SoundIOFormat Format
-        {
-            get { return (SoundIOFormat)Marshal.ReadInt32(handle, format_offset); }
-            set { Marshal.WriteInt32(handle, format_offset, (int) value); }
-        }
-
-        static readonly int format_offset = (int)Marshal.OffsetOf<SoundIoInStream>("format");
-
-        public int SampleRate
-        {
-            get { return Marshal.ReadInt32(handle, sample_rate_offset); }
-            set { Marshal.WriteInt32(handle, sample_rate_offset, value); }
-        }
-
-        static readonly int sample_rate_offset = (int)Marshal.OffsetOf<SoundIoInStream>("sample_rate");
-
-        public SoundIOChannelLayout Layout
-        {
-            get { return new SoundIOChannelLayout ((IntPtr) handle + layout_offset); }
-            set 
-            {
-                unsafe
-                {
-                    Buffer.MemoryCopy((void*)((IntPtr)handle + layout_offset), (void*)value.Handle, Marshal.SizeOf<SoundIoChannelLayout>(), Marshal.SizeOf<SoundIoChannelLayout>());
-                }
-            }
-        }
-
-        static readonly int layout_offset = (int)Marshal.OffsetOf<SoundIoInStream>("layout");
-
-        public double SoftwareLatency
-        {
-            get { return MarshalEx.ReadDouble(handle, software_latency_offset); }
-            set { MarshalEx.WriteDouble(handle, software_latency_offset, value); }
-        }
-
-        static readonly int software_latency_offset = (int)Marshal.OffsetOf<SoundIoInStream>("software_latency");
-
-        // error_callback
-        public Action ErrorCallback
-        {
-            get { return error_callback; }
-            set
-            {
-                error_callback = value;
-                error_callback_native = _ => error_callback();
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(error_callback_native);
-
-                Marshal.WriteIntPtr(handle, error_callback_offset, ptr);
-            }
-        }
-
-        static readonly int error_callback_offset = (int)Marshal.OffsetOf<SoundIoInStream>("error_callback");
-
-        Action error_callback;
-        delegate void error_callback_delegate(IntPtr handle);
-        error_callback_delegate error_callback_native;
-
-        // read_callback
-        public Action<int,int> ReadCallback
-        {
-            get { return read_callback; }
-            set
-            {
-                read_callback = value;
-                read_callback_native = (_, minFrameCount, maxFrameCount) => read_callback(minFrameCount, maxFrameCount);
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(read_callback_native);
-
-                Marshal.WriteIntPtr(handle, read_callback_offset, ptr);
-            }
-        }
-
-        static readonly int read_callback_offset = (int)Marshal.OffsetOf<SoundIoInStream>("read_callback");
-
-        Action<int, int> read_callback;
-        delegate void read_callback_delegate(IntPtr handle, int min, int max);
-        read_callback_delegate read_callback_native;
-
-        // overflow_callback
-        public Action OverflowCallback
-        {
-            get { return overflow_callback; }
-            set
-            {
-                overflow_callback = value;
-                overflow_callback_native = _ => overflow_callback();
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(overflow_callback_native);
-
-                Marshal.WriteIntPtr(handle, overflow_callback_offset, ptr);
-            }
-        }
-        static readonly int overflow_callback_offset = (int)Marshal.OffsetOf<SoundIoInStream>("overflow_callback");
-
-        Action overflow_callback;
-        delegate void overflow_callback_delegate(IntPtr handle);
-        overflow_callback_delegate overflow_callback_native;
-
-        // FIXME: this should be taken care in more centralized/decent manner... we don't want to write
-        // this kind of code anywhere we need string marshaling.
-        List<IntPtr> allocated_hglobals = new List<IntPtr>();
-
-        public string Name
-        {
-            get { return Marshal.PtrToStringAnsi(Marshal.ReadIntPtr(handle, name_offset)); }
-            set
-            {
-                unsafe
-                {
-                    var existing = Marshal.ReadIntPtr(handle, name_offset);
-                    if (allocated_hglobals.Contains(existing))
-                    {
-                        allocated_hglobals.Remove(existing);
-                        Marshal.FreeHGlobal(existing);
-                    }
-
-                    var ptr = Marshal.StringToHGlobalAnsi(value);
-                    Marshal.WriteIntPtr(handle, name_offset, ptr);
-                    allocated_hglobals.Add(ptr);
-                }
-            }
-        }
-
-        static readonly int name_offset = (int)Marshal.OffsetOf<SoundIoInStream>("name");
-
-        public bool NonTerminalHint
-        {
-            get { return Marshal.ReadInt32(handle, non_terminal_hint_offset) != 0; }
-        }
-
-        static readonly int non_terminal_hint_offset = (int)Marshal.OffsetOf<SoundIoInStream>("non_terminal_hint");
-
-        public int BytesPerFrame
-        {
-            get { return Marshal.ReadInt32(handle, bytes_per_frame_offset); }
-        }
-
-        static readonly int bytes_per_frame_offset = (int)Marshal.OffsetOf<SoundIoInStream>("bytes_per_frame");
-
-        public int BytesPerSample
-        {
-            get { return Marshal.ReadInt32(handle, bytes_per_sample_offset); }
-        }
-
-        static readonly int bytes_per_sample_offset = (int)Marshal.OffsetOf<SoundIoInStream>("bytes_per_sample");
-
-        public string LayoutErrorMessage
-        {
-            get 
-            {
-                var code = (SoundIoError)Marshal.ReadInt32(handle, layout_error_offset);
-
-                return code == SoundIoError.SoundIoErrorNone ? null : Marshal.PtrToStringAnsi(Natives.soundio_strerror((int)code));
-            }
-        }
-
-        static readonly int layout_error_offset = (int)Marshal.OffsetOf<SoundIoInStream>("layout_error");
-
-        // functions
-
-        public void Open()
-        {
-            var ret = (SoundIoError)Natives.soundio_instream_open(handle);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public void Start()
-        {
-            var ret = (SoundIoError)Natives.soundio_instream_start(handle);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public SoundIOChannelAreas BeginRead(ref int frameCount)
-        {
-            IntPtr ptrs             = default;
-            int    nativeFrameCount = frameCount;
-
-            unsafe
-            {
-                var frameCountPtr = &nativeFrameCount;
-                var ptrptr        = &ptrs;
-                var ret           = (SoundIoError)Natives.soundio_instream_begin_read(handle, (IntPtr)ptrptr, (IntPtr)frameCountPtr);
-
-                frameCount = *frameCountPtr;
-
-                if (ret != SoundIoError.SoundIoErrorNone)
-                {
-                    throw new SoundIOException(ret);
-                }
-
-                return new SoundIOChannelAreas(ptrs, Layout.ChannelCount, frameCount);
-            }
-        }
-
-        public void EndRead()
-        {
-            var ret = (SoundIoError)Natives.soundio_instream_end_read(handle);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public void Pause(bool pause)
-        {
-            var ret = (SoundIoError)Natives.soundio_instream_pause(handle, pause);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public double GetLatency()
-        {
-            unsafe
-            {
-                double* dptr = null;
-                IntPtr  p    = new IntPtr(dptr);
-
-                var ret = (SoundIoError)Natives.soundio_instream_get_latency(handle, p);
-                if (ret != SoundIoError.SoundIoErrorNone)
-                {
-                    throw new SoundIOException(ret);
-                }
-
-                dptr = (double*)p;
-
-                return *dptr;
-            }
-        }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOOutStream.cs

@@ -1,331 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Runtime.InteropServices;
-
-namespace SoundIOSharp
-{
-    public class SoundIOOutStream : IDisposable
-    {
-        internal SoundIOOutStream (Pointer<SoundIoOutStream> handle)
-        {
-            this.handle = handle;
-        }
-
-        Pointer<SoundIoOutStream> handle;
-
-        public void Dispose ()
-        {
-            Natives.soundio_outstream_destroy (handle);
-        }
-        // Equality (based on handle)
-
-        public override bool Equals (object other)
-        {
-            var d = other as SoundIOOutStream;
-
-            return d != null && (this.handle == d.handle);
-        }
-
-        public override int GetHashCode ()
-        {
-            return (int)(IntPtr)handle;
-        }
-
-        public static bool operator == (SoundIOOutStream obj1, SoundIOOutStream obj2)
-        {
-            return obj1 is null ? obj2 is null : obj1.Equals(obj2);
-        }
-
-        public static bool operator != (SoundIOOutStream obj1, SoundIOOutStream obj2)
-        {
-            return obj1 is null ? obj2 is object : !obj1.Equals(obj2);
-        }
-
-        // fields
-
-        public SoundIODevice Device
-        {
-            get { return new SoundIODevice(Marshal.ReadIntPtr(handle, device_offset)); }
-        }
-
-        static readonly int device_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("device");
-
-        public SoundIOFormat Format
-        {
-            get { return (SoundIOFormat) Marshal.ReadInt32(handle, format_offset); }
-            set { Marshal.WriteInt32(handle, format_offset, (int) value); }
-        }
-
-        static readonly int format_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("format");
-
-        public int SampleRate
-        {
-            get { return Marshal.ReadInt32(handle, sample_rate_offset); }
-            set { Marshal.WriteInt32(handle, sample_rate_offset, value); }
-        }
-
-        static readonly int sample_rate_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("sample_rate");
-
-        public SoundIOChannelLayout Layout
-        {
-            get { unsafe { return new SoundIOChannelLayout((IntPtr) (void*)((IntPtr)handle + layout_offset)); } }
-            set
-            {
-                unsafe
-                {
-                    Buffer.MemoryCopy((void*)value.Handle, (void*)((IntPtr)handle + layout_offset), Marshal.SizeOf<SoundIoChannelLayout>(), Marshal.SizeOf<SoundIoChannelLayout>());
-                }
-            }
-        }
-        static readonly int layout_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("layout");
-
-        public double SoftwareLatency
-        {
-            get { return MarshalEx.ReadDouble (handle, software_latency_offset); }
-            set { MarshalEx.WriteDouble (handle, software_latency_offset, value); }
-        }
-
-        static readonly int software_latency_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("software_latency");
-
-        public float Volume
-        {
-            get { return MarshalEx.ReadFloat(handle, volume_offset); }
-            set { MarshalEx.WriteFloat(handle, volume_offset, value); }
-        }
-
-        static readonly int volume_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("volume");
-
-        // error_callback
-        public Action ErrorCallback
-        {
-            get { return error_callback; }
-            set
-            {
-                error_callback = value;
-                if (value == null)
-                {
-                    error_callback_native = null;
-                }
-                else
-                {
-                    error_callback_native = stream => error_callback();
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate(error_callback_native);
-                Marshal.WriteIntPtr(handle, error_callback_offset, ptr);
-            }
-        }
-
-        static readonly int error_callback_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("error_callback");
-
-        Action error_callback;
-        delegate void error_callback_delegate (IntPtr handle);
-        error_callback_delegate error_callback_native;
-
-        // write_callback
-        public Action<int, int> WriteCallback
-        {
-            get { return write_callback; }
-            set
-            {
-                write_callback = value;
-                if (value == null)
-                {
-                    write_callback_native = null;
-                }
-                else
-                {
-                    write_callback_native = (h, frame_count_min, frame_count_max) => write_callback(frame_count_min, frame_count_max);
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate (write_callback_native);
-                Marshal.WriteIntPtr (handle, write_callback_offset, ptr);
-            }
-        }
-
-        static readonly int write_callback_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("write_callback");
-
-        Action<int, int> write_callback;
-        delegate void write_callback_delegate(IntPtr handle, int min, int max);
-        write_callback_delegate write_callback_native;
-
-        // underflow_callback
-        public Action UnderflowCallback
-        {
-            get { return underflow_callback; }
-            set
-            {
-                underflow_callback = value;
-                if (value == null)
-                {
-                    underflow_callback_native = null;
-                }
-                else
-                {
-                    underflow_callback_native = h => underflow_callback();
-                }
-
-                var ptr = Marshal.GetFunctionPointerForDelegate (underflow_callback_native);
-                Marshal.WriteIntPtr (handle, underflow_callback_offset, ptr);
-            }
-        }
-
-        static readonly int underflow_callback_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("underflow_callback");
-        
-        Action underflow_callback;
-        delegate void underflow_callback_delegate(IntPtr handle);
-        underflow_callback_delegate underflow_callback_native;
-
-        // FIXME: this should be taken care in more centralized/decent manner... we don't want to write
-        // this kind of code anywhere we need string marshaling.
-        List<IntPtr> allocated_hglobals = new List<IntPtr>();
-
-        public string Name {
-            get { return Marshal.PtrToStringAnsi(Marshal.ReadIntPtr(handle, name_offset)); }
-            set
-            {
-                unsafe
-                {
-                    var existing = Marshal.ReadIntPtr(handle, name_offset);
-                    if (allocated_hglobals.Contains(existing))
-                    {
-                        allocated_hglobals.Remove(existing);
-                        Marshal.FreeHGlobal(existing);
-                    }
-
-                    var ptr = Marshal.StringToHGlobalAnsi(value);
-                    Marshal.WriteIntPtr(handle, name_offset, ptr);
-                    allocated_hglobals.Add(ptr);
-                }
-            }
-        }
-
-        static readonly int name_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("name");
-
-        public bool NonTerminalHint
-        {
-            get { return Marshal.ReadInt32(handle, non_terminal_hint_offset) != 0; }
-        }
-
-        static readonly int non_terminal_hint_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("non_terminal_hint");
-
-        public int BytesPerFrame
-        {
-            get { return Marshal.ReadInt32(handle, bytes_per_frame_offset); }
-        }
-
-        static readonly int bytes_per_frame_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("bytes_per_frame");
-
-        public int BytesPerSample
-        {
-            get { return Marshal.ReadInt32(handle, bytes_per_sample_offset); }
-        }
-
-        static readonly int bytes_per_sample_offset = (int)Marshal.OffsetOf<SoundIoOutStream>("bytes_per_sample");
-
-        public string LayoutErrorMessage
-        {
-            get
-            {
-                var code = (SoundIoError)Marshal.ReadInt32(handle, layout_error_offset);
-
-                return code == SoundIoError.SoundIoErrorNone ? null : Marshal.PtrToStringAnsi(Natives.soundio_strerror((int)code));
-            }
-        }
-
-        static readonly int layout_error_offset = (int)Marshal.OffsetOf<SoundIoOutStream> ("layout_error");
-
-        // functions
-
-        public void Open ()
-        {
-            var ret = (SoundIoError)Natives.soundio_outstream_open(handle);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public void Start ()
-        {
-            var ret = (SoundIoError)Natives.soundio_outstream_start(handle);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public SoundIOChannelAreas BeginWrite(ref int frameCount)
-        {
-            IntPtr ptrs             = default;
-            int    nativeFrameCount = frameCount;
-
-            unsafe
-            {
-                var frameCountPtr = &nativeFrameCount;
-                var ptrptr        = &ptrs;
-                var ret           = (SoundIoError)Natives.soundio_outstream_begin_write(handle, (IntPtr)ptrptr, (IntPtr)frameCountPtr);
-
-                frameCount = *frameCountPtr;
-
-                if (ret != SoundIoError.SoundIoErrorNone)
-                {
-                    throw new SoundIOException(ret);
-                }
-
-                return new SoundIOChannelAreas(ptrs, Layout.ChannelCount, frameCount);
-            }
-        }
-
-        public void EndWrite ()
-        {
-            var ret = (SoundIoError)Natives.soundio_outstream_end_write(handle);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public void ClearBuffer ()
-        {
-            _ = Natives.soundio_outstream_clear_buffer(handle);
-        }
-
-        public void Pause (bool pause)
-        {
-            var ret = (SoundIoError)Natives.soundio_outstream_pause(handle, pause);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-
-        public double GetLatency ()
-        {
-            unsafe
-            {
-                double* dptr = null;
-                IntPtr  p    = new IntPtr(dptr);
-
-                var ret = (SoundIoError)Natives.soundio_outstream_get_latency(handle, p);
-                if (ret != SoundIoError.SoundIoErrorNone)
-                {
-                    throw new SoundIOException(ret);
-                }
-
-                dptr = (double*)p;
-
-                return *dptr;
-            }
-        }
-
-        public void SetVolume (double volume)
-        {
-            var ret = (SoundIoError)Natives.soundio_outstream_set_volume(handle, volume);
-            if (ret != SoundIoError.SoundIoErrorNone)
-            {
-                throw new SoundIOException(ret);
-            }
-        }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIORingBuffer.cs

@@ -1,58 +0,0 @@
-using System;
-namespace SoundIOSharp
-{
-    public class SoundIORingBuffer : IDisposable
-    {
-        internal SoundIORingBuffer(IntPtr handle)
-        {
-            this.handle = handle;
-        }
-
-        IntPtr handle;
-
-        public int Capacity
-        {
-            get { return Natives.soundio_ring_buffer_capacity(handle); }
-        }
-
-        public void Clear()
-        {
-            Natives.soundio_ring_buffer_clear(handle);
-        }
-
-        public void Dispose()
-        {
-            Natives.soundio_ring_buffer_destroy(handle);
-        }
-
-        public int FillCount
-        {
-            get { return Natives.soundio_ring_buffer_fill_count(handle); }
-        }
-
-        public int FreeCount
-        {
-            get { return Natives.soundio_ring_buffer_free_count(handle); }
-        }
-
-        public IntPtr ReadPointer
-        {
-            get { return Natives.soundio_ring_buffer_read_ptr(handle); }
-        }
-
-        public IntPtr WritePointer
-        {
-            get { return Natives.soundio_ring_buffer_write_ptr(handle); }
-        }
-
-        public void AdvanceReadPointer(int count)
-        {
-            Natives.soundio_ring_buffer_advance_read_ptr(handle, count);
-        }
-
-        public void AdvanceWritePointer(int count)
-        {
-            Natives.soundio_ring_buffer_advance_write_ptr(handle, count);
-        }
-    }
-}

Ryujinx.Audio/Native/libsoundio/SoundIOSampleRateRange.cs

@@ -1,15 +0,0 @@
-using System;
-namespace SoundIOSharp
-{
-    public struct SoundIOSampleRateRange
-    {
-        internal SoundIOSampleRateRange(int min, int max)
-        {
-            Min = min;
-            Max = max;
-        }
-
-        public readonly int Min;
-        public readonly int Max;
-    }
-}

Ryujinx.Audio/Native/libsoundio/libsoundio-interop.cs

@@ -1,643 +0,0 @@
-// This source file is generated by nclang PInvokeGenerator.
-using System;
-using System.Runtime.InteropServices;
-using delegate0 = SoundIOSharp.Delegates.delegate0;
-using delegate1 = SoundIOSharp.Delegates.delegate1;
-using delegate2 = SoundIOSharp.Delegates.delegate2;
-using delegate3 = SoundIOSharp.Delegates.delegate3;
-using delegate4 = SoundIOSharp.Delegates.delegate4;
-using delegate5 = SoundIOSharp.Delegates.delegate5;
-using delegate6 = SoundIOSharp.Delegates.delegate6;
-using delegate7 = SoundIOSharp.Delegates.delegate7;
-using delegate8 = SoundIOSharp.Delegates.delegate8;
-using delegate9 = SoundIOSharp.Delegates.delegate9;
-
-namespace SoundIOSharp
-{
-    enum SoundIoError // soundio.h (72, 6)
-    {
-        SoundIoErrorNone = 0,
-        SoundIoErrorNoMem = 1,
-        SoundIoErrorInitAudioBackend = 2,
-        SoundIoErrorSystemResources = 3,
-        SoundIoErrorOpeningDevice = 4,
-        SoundIoErrorNoSuchDevice = 5,
-        SoundIoErrorInvalid = 6,
-        SoundIoErrorBackendUnavailable = 7,
-        SoundIoErrorStreaming = 8,
-        SoundIoErrorIncompatibleDevice = 9,
-        SoundIoErrorNoSuchClient = 10,
-        SoundIoErrorIncompatibleBackend = 11,
-        SoundIoErrorBackendDisconnected = 12,
-        SoundIoErrorInterrupted = 13,
-        SoundIoErrorUnderflow = 14,
-        SoundIoErrorEncodingString = 15,
-    }
-
-    enum SoundIoChannelId // soundio.h (106, 6)
-    {
-        SoundIoChannelIdInvalid = 0,
-        SoundIoChannelIdFrontLeft = 1,
-        SoundIoChannelIdFrontRight = 2,
-        SoundIoChannelIdFrontCenter = 3,
-        SoundIoChannelIdLfe = 4,
-        SoundIoChannelIdBackLeft = 5,
-        SoundIoChannelIdBackRight = 6,
-        SoundIoChannelIdFrontLeftCenter = 7,
-        SoundIoChannelIdFrontRightCenter = 8,
-        SoundIoChannelIdBackCenter = 9,
-        SoundIoChannelIdSideLeft = 10,
-        SoundIoChannelIdSideRight = 11,
-        SoundIoChannelIdTopCenter = 12,
-        SoundIoChannelIdTopFrontLeft = 13,
-        SoundIoChannelIdTopFrontCenter = 14,
-        SoundIoChannelIdTopFrontRight = 15,
-        SoundIoChannelIdTopBackLeft = 16,
-        SoundIoChannelIdTopBackCenter = 17,
-        SoundIoChannelIdTopBackRight = 18,
-        SoundIoChannelIdBackLeftCenter = 19,
-        SoundIoChannelIdBackRightCenter = 20,
-        SoundIoChannelIdFrontLeftWide = 21,
-        SoundIoChannelIdFrontRightWide = 22,
-        SoundIoChannelIdFrontLeftHigh = 23,
-        SoundIoChannelIdFrontCenterHigh = 24,
-        SoundIoChannelIdFrontRightHigh = 25,
-        SoundIoChannelIdTopFrontLeftCenter = 26,
-        SoundIoChannelIdTopFrontRightCenter = 27,
-        SoundIoChannelIdTopSideLeft = 28,
-        SoundIoChannelIdTopSideRight = 29,
-        SoundIoChannelIdLeftLfe = 30,
-        SoundIoChannelIdRightLfe = 31,
-        SoundIoChannelIdLfe2 = 32,
-        SoundIoChannelIdBottomCenter = 33,
-        SoundIoChannelIdBottomLeftCenter = 34,
-        SoundIoChannelIdBottomRightCenter = 35,
-        SoundIoChannelIdMsMid = 36,
-        SoundIoChannelIdMsSide = 37,
-        SoundIoChannelIdAmbisonicW = 38,
-        SoundIoChannelIdAmbisonicX = 39,
-        SoundIoChannelIdAmbisonicY = 40,
-        SoundIoChannelIdAmbisonicZ = 41,
-        SoundIoChannelIdXyX = 42,
-        SoundIoChannelIdXyY = 43,
-        SoundIoChannelIdHeadphonesLeft = 44,
-        SoundIoChannelIdHeadphonesRight = 45,
-        SoundIoChannelIdClickTrack = 46,
-        SoundIoChannelIdForeignLanguage = 47,
-        SoundIoChannelIdHearingImpaired = 48,
-        SoundIoChannelIdNarration = 49,
-        SoundIoChannelIdHaptic = 50,
-        SoundIoChannelIdDialogCentricMix = 51,
-        SoundIoChannelIdAux = 52,
-        SoundIoChannelIdAux0 = 53,
-        SoundIoChannelIdAux1 = 54,
-        SoundIoChannelIdAux2 = 55,
-        SoundIoChannelIdAux3 = 56,
-        SoundIoChannelIdAux4 = 57,
-        SoundIoChannelIdAux5 = 58,
-        SoundIoChannelIdAux6 = 59,
-        SoundIoChannelIdAux7 = 60,
-        SoundIoChannelIdAux8 = 61,
-        SoundIoChannelIdAux9 = 62,
-        SoundIoChannelIdAux10 = 63,
-        SoundIoChannelIdAux11 = 64,
-        SoundIoChannelIdAux12 = 65,
-        SoundIoChannelIdAux13 = 66,
-        SoundIoChannelIdAux14 = 67,
-        SoundIoChannelIdAux15 = 68,
-    }
-
-    enum SoundIoChannelLayoutId // soundio.h (189, 6)
-    {
-        SoundIoChannelLayoutIdMono = 0,
-        SoundIoChannelLayoutIdStereo = 1,
-        SoundIoChannelLayoutId2Point1 = 2,
-        SoundIoChannelLayoutId3Point0 = 3,
-        SoundIoChannelLayoutId3Point0Back = 4,
-        SoundIoChannelLayoutId3Point1 = 5,
-        SoundIoChannelLayoutId4Point0 = 6,
-        SoundIoChannelLayoutIdQuad = 7,
-        SoundIoChannelLayoutIdQuadSide = 8,
-        SoundIoChannelLayoutId4Point1 = 9,
-        SoundIoChannelLayoutId5Point0Back = 10,
-        SoundIoChannelLayoutId5Point0Side = 11,
-        SoundIoChannelLayoutId5Point1 = 12,
-        SoundIoChannelLayoutId5Point1Back = 13,
-        SoundIoChannelLayoutId6Point0Side = 14,
-        SoundIoChannelLayoutId6Point0Front = 15,
-        SoundIoChannelLayoutIdHexagonal = 16,
-        SoundIoChannelLayoutId6Point1 = 17,
-        SoundIoChannelLayoutId6Point1Back = 18,
-        SoundIoChannelLayoutId6Point1Front = 19,
-        SoundIoChannelLayoutId7Point0 = 20,
-        SoundIoChannelLayoutId7Point0Front = 21,
-        SoundIoChannelLayoutId7Point1 = 22,
-        SoundIoChannelLayoutId7Point1Wide = 23,
-        SoundIoChannelLayoutId7Point1WideBack = 24,
-        SoundIoChannelLayoutIdOctagonal = 25,
-    }
-
-    enum SoundIoBackend // soundio.h (218, 6)
-    {
-        SoundIoBackendNone = 0,
-        SoundIoBackendJack = 1,
-        SoundIoBackendPulseAudio = 2,
-        SoundIoBackendAlsa = 3,
-        SoundIoBackendCoreAudio = 4,
-        SoundIoBackendWasapi = 5,
-        SoundIoBackendDummy = 6,
-    }
-
-    enum SoundIoDeviceAim // soundio.h (228, 6)
-    {
-        SoundIoDeviceAimInput = 0,
-        SoundIoDeviceAimOutput = 1,
-    }
-
-    enum SoundIoFormat // soundio.h (235, 6)
-    {
-        SoundIoFormatInvalid = 0,
-        SoundIoFormatS8 = 1,
-        SoundIoFormatU8 = 2,
-        SoundIoFormatS16LE = 3,
-        SoundIoFormatS16BE = 4,
-        SoundIoFormatU16LE = 5,
-        SoundIoFormatU16BE = 6,
-        SoundIoFormatS24LE = 7,
-        SoundIoFormatS24BE = 8,
-        SoundIoFormatU24LE = 9,
-        SoundIoFormatU24BE = 10,
-        SoundIoFormatS32LE = 11,
-        SoundIoFormatS32BE = 12,
-        SoundIoFormatU32LE = 13,
-        SoundIoFormatU32BE = 14,
-        SoundIoFormatFloat32LE = 15,
-        SoundIoFormatFloat32BE = 16,
-        SoundIoFormatFloat64LE = 17,
-        SoundIoFormatFloat64BE = 18,
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIoChannelLayout // soundio.h (306, 8)
-    {
-        [CTypeDetails("Pointer<byte>")] public System.IntPtr @name;
-        public int @channel_count;
-        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 24)]
-        [CTypeDetails("ConstArrayOf<SoundIoChannelId>")] public SoundIoChannelId[] @channels;
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIoSampleRateRange // soundio.h (313, 8)
-    {
-        public int @min;
-        public int @max;
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIoChannelArea // soundio.h (319, 8)
-    {
-        [CTypeDetails("Pointer<byte>")] public System.IntPtr @ptr;
-        public int @step;
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIo // soundio.h (328, 8)
-    {
-        [CTypeDetails("Pointer<void>")] public System.IntPtr @userdata;
-        [CTypeDetails("Pointer<void (SoundIo *)>")] public delegate0 @on_devices_change;
-        [CTypeDetails("Pointer<void (SoundIo *, int)>")] public delegate1 @on_backend_disconnect;
-        [CTypeDetails("Pointer<void (SoundIo *)>")] public Delegates.delegate0 @on_events_signal;
-        public SoundIoBackend @current_backend;
-        [CTypeDetails("Pointer<byte>")] public System.IntPtr @app_name;
-        [CTypeDetails("Pointer<void ()>")] public delegate2 @emit_rtprio_warning;
-        [CTypeDetails("Pointer<void (const char *)>")] public delegate3 @jack_info_callback;
-        [CTypeDetails("Pointer<void (const char *)>")] public Delegates.delegate3 @jack_error_callback;
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIoDevice // soundio.h (387, 8)
-    {
-        [CTypeDetails("Pointer<SoundIo>")] public System.IntPtr @soundio;
-        [CTypeDetails("Pointer<byte>")] public System.IntPtr @id;
-        [CTypeDetails("Pointer<byte>")] public System.IntPtr @name;
-        public SoundIoDeviceAim @aim;
-        [CTypeDetails("Pointer<SoundIoChannelLayout>")] public System.IntPtr @layouts;
-        public int @layout_count;
-        public SoundIoChannelLayout @current_layout;
-        [CTypeDetails("Pointer<SoundIoFormat>")] public System.IntPtr @formats;
-        public int @format_count;
-        public SoundIoFormat @current_format;
-        [CTypeDetails("Pointer<SoundIoSampleRateRange>")] public System.IntPtr @sample_rates;
-        public int @sample_rate_count;
-        public int @sample_rate_current;
-        public double @software_latency_min;
-        public double @software_latency_max;
-        public double @software_latency_current;
-        public bool @is_raw;
-        public int @ref_count;
-        public int @probe_error;
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIoOutStream // soundio.h (497, 8)
-    {
-        [CTypeDetails("Pointer<SoundIoDevice>")] public System.IntPtr @device;
-        public SoundIoFormat @format;
-        public int @sample_rate;
-        public SoundIoChannelLayout @layout;
-        public double @software_latency;
-        public float @volume;
-        [CTypeDetails("Pointer<void>")] public System.IntPtr @userdata;
-        [CTypeDetails("Pointer<void (SoundIoOutStream *, int, int)>")] public delegate4 @write_callback;
-        [CTypeDetails("Pointer<void (SoundIoOutStream *)>")] public delegate5 @underflow_callback;
-        [CTypeDetails("Pointer<void (SoundIoOutStream *, int)>")] public delegate6 @error_callback;
-        [CTypeDetails("Pointer<byte>")] public System.IntPtr @name;
-        public bool @non_terminal_hint;
-        public int @bytes_per_frame;
-        public int @bytes_per_sample;
-        public int @layout_error;
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIoInStream // soundio.h (600, 8)
-    {
-        [CTypeDetails("Pointer<SoundIoDevice>")] public System.IntPtr @device;
-        public SoundIoFormat @format;
-        public int @sample_rate;
-        public SoundIoChannelLayout @layout;
-        public double @software_latency;
-        [CTypeDetails("Pointer<void>")] public System.IntPtr @userdata;
-        [CTypeDetails("Pointer<void (SoundIoInStream *, int, int)>")] public delegate7 @read_callback;
-        [CTypeDetails("Pointer<void (SoundIoInStream *)>")] public delegate8 @overflow_callback;
-        [CTypeDetails("Pointer<void (SoundIoInStream *, int)>")] public delegate9 @error_callback;
-        [CTypeDetails("Pointer<byte>")] public System.IntPtr @name;
-        public bool @non_terminal_hint;
-        public int @bytes_per_frame;
-        public int @bytes_per_sample;
-        public int @layout_error;
-    }
-
-    [StructLayout(LayoutKind.Sequential)]
-    struct SoundIoRingBuffer // soundio.h (1170, 8)
-    {
-    }
-
-    partial class Natives
-    {
-        const string LibraryName = "libsoundio";
-        // function soundio_version_string - soundio.h (682, 28)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_version_string();
-
-        // function soundio_version_major - soundio.h (684, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_version_major();
-
-        // function soundio_version_minor - soundio.h (686, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_version_minor();
-
-        // function soundio_version_patch - soundio.h (688, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_version_patch();
-
-        // function soundio_create - soundio.h (694, 32)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_create();
-
-        // function soundio_destroy - soundio.h (695, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_destroy([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_connect - soundio.h (705, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_connect([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_connect_backend - soundio.h (717, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_connect_backend([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio, SoundIoBackend @backend);
-
-        // function soundio_disconnect - soundio.h (718, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_disconnect([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_strerror - soundio.h (721, 28)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_strerror(int @error);
-
-        // function soundio_backend_name - soundio.h (723, 28)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_backend_name(SoundIoBackend @backend);
-
-        // function soundio_backend_count - soundio.h (726, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_backend_count([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_get_backend - soundio.h (729, 36)
-        [DllImport(LibraryName)]
-        internal static extern SoundIoBackend soundio_get_backend([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio, int @index);
-
-        // function soundio_have_backend - soundio.h (732, 21)
-        [DllImport(LibraryName)]
-        internal static extern bool soundio_have_backend(SoundIoBackend @backend);
-
-        // function soundio_flush_events - soundio.h (756, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_flush_events([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_wait_events - soundio.h (760, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_wait_events([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_wakeup - soundio.h (763, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_wakeup([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_force_device_scan - soundio.h (780, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_force_device_scan([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_channel_layout_equal - soundio.h (787, 21)
-        [DllImport(LibraryName)]
-        internal static extern bool soundio_channel_layout_equal([CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @a, [CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @b);
-
-        // function soundio_get_channel_name - soundio.h (791, 28)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_get_channel_name(SoundIoChannelId @id);
-
-        // function soundio_parse_channel_id - soundio.h (795, 38)
-        [DllImport(LibraryName)]
-        internal static extern SoundIoChannelId soundio_parse_channel_id([CTypeDetails("Pointer<byte>")]System.IntPtr @str, int @str_len);
-
-        // function soundio_channel_layout_builtin_count - soundio.h (798, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_channel_layout_builtin_count();
-
-        // function soundio_channel_layout_get_builtin - soundio.h (803, 51)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_channel_layout_get_builtin(int @index);
-
-        // function soundio_channel_layout_get_default - soundio.h (806, 51)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_channel_layout_get_default(int @channel_count);
-
-        // function soundio_channel_layout_find_channel - soundio.h (809, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_channel_layout_find_channel([CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @layout, SoundIoChannelId @channel);
-
-        // function soundio_channel_layout_detect_builtin - soundio.h (814, 21)
-        [DllImport(LibraryName)]
-        internal static extern bool soundio_channel_layout_detect_builtin([CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @layout);
-
-        // function soundio_best_matching_channel_layout - soundio.h (819, 51)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_best_matching_channel_layout([CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @preferred_layouts, int @preferred_layout_count, [CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @available_layouts, int @available_layout_count);
-
-        // function soundio_sort_channel_layouts - soundio.h (824, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_sort_channel_layouts([CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @layouts, int @layout_count);
-
-        // function soundio_get_bytes_per_sample - soundio.h (830, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_get_bytes_per_sample(SoundIoFormat @format);
-
-        // function soundio_get_bytes_per_frame - soundio.h (833, 19)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_get_bytes_per_frame(SoundIoFormat @format, int @channel_count);
-
-        // function soundio_get_bytes_per_second - soundio.h (838, 19)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_get_bytes_per_second(SoundIoFormat @format, int @channel_count, int @sample_rate);
-
-        // function soundio_format_string - soundio.h (845, 29)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_format_string(SoundIoFormat @format);
-
-        // function soundio_input_device_count - soundio.h (861, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_input_device_count([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_output_device_count - soundio.h (864, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_output_device_count([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_get_input_device - soundio.h (870, 38)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_get_input_device([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio, int @index);
-
-        // function soundio_get_output_device - soundio.h (875, 38)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_get_output_device([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio, int @index);
-
-        // function soundio_default_input_device_index - soundio.h (880, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_default_input_device_index([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_default_output_device_index - soundio.h (885, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_default_output_device_index([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio);
-
-        // function soundio_device_ref - soundio.h (888, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_device_ref([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device);
-
-        // function soundio_device_unref - soundio.h (891, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_device_unref([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device);
-
-        // function soundio_device_equal - soundio.h (895, 21)
-        [DllImport(LibraryName)]
-        internal static extern bool soundio_device_equal([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @a, [CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @b);
-
-        // function soundio_device_sort_channel_layouts - soundio.h (900, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_device_sort_channel_layouts([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device);
-
-        // function soundio_device_supports_format - soundio.h (904, 21)
-        [DllImport(LibraryName)]
-        internal static extern bool soundio_device_supports_format([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device, SoundIoFormat @format);
-
-        // function soundio_device_supports_layout - soundio.h (909, 21)
-        [DllImport(LibraryName)]
-        internal static extern bool soundio_device_supports_layout([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device, [CTypeDetails("Pointer<SoundIoChannelLayout>")]System.IntPtr @layout);
-
-        // function soundio_device_supports_sample_rate - soundio.h (914, 21)
-        [DllImport(LibraryName)]
-        internal static extern bool soundio_device_supports_sample_rate([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device, int @sample_rate);
-
-        // function soundio_device_nearest_sample_rate - soundio.h (919, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_device_nearest_sample_rate([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device, int @sample_rate);
-
-        // function soundio_outstream_create - soundio.h (929, 41)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_outstream_create([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device);
-
-        // function soundio_outstream_destroy - soundio.h (931, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_outstream_destroy([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream);
-
-        // function soundio_outstream_open - soundio.h (954, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_open([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream);
-
-        // function soundio_outstream_start - soundio.h (965, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_start([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream);
-
-        // function soundio_outstream_begin_write - soundio.h (997, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_begin_write([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream, [CTypeDetails("Pointer<System.IntPtr>")]System.IntPtr @areas, [CTypeDetails("Pointer<int>")]System.IntPtr @frame_count);
-
-        // function soundio_outstream_end_write - soundio.h (1009, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_end_write([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream);
-
-        // function soundio_outstream_clear_buffer - soundio.h (1024, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_clear_buffer([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream);
-
-        // function soundio_outstream_pause - soundio.h (1045, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_pause([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream, bool @pause);
-
-        // function soundio_outstream_get_latency - soundio.h (1058, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_get_latency([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream, [CTypeDetails("Pointer<double>")]System.IntPtr @out_latency);
-
-        // function soundio_outstream_set_volume - soundio.h (1061, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_outstream_set_volume([CTypeDetails("Pointer<SoundIoOutStream>")]System.IntPtr @outstream, double @volume);
-
-        // function soundio_instream_create - soundio.h (1071, 40)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_instream_create([CTypeDetails("Pointer<SoundIoDevice>")]System.IntPtr @device);
-
-        // function soundio_instream_destroy - soundio.h (1073, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_instream_destroy([CTypeDetails("Pointer<SoundIoInStream>")]System.IntPtr @instream);
-
-        // function soundio_instream_open - soundio.h (1093, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_instream_open([CTypeDetails("Pointer<SoundIoInStream>")]System.IntPtr @instream);
-
-        // function soundio_instream_start - soundio.h (1102, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_instream_start([CTypeDetails("Pointer<SoundIoInStream>")]System.IntPtr @instream);
-
-        // function soundio_instream_begin_read - soundio.h (1133, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_instream_begin_read([CTypeDetails("Pointer<SoundIoInStream>")]System.IntPtr @instream, [CTypeDetails("Pointer<System.IntPtr>")]System.IntPtr @areas, [CTypeDetails("Pointer<int>")]System.IntPtr @frame_count);
-
-        // function soundio_instream_end_read - soundio.h (1143, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_instream_end_read([CTypeDetails("Pointer<SoundIoInStream>")]System.IntPtr @instream);
-
-        // function soundio_instream_pause - soundio.h (1156, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_instream_pause([CTypeDetails("Pointer<SoundIoInStream>")]System.IntPtr @instream, bool @pause);
-
-        // function soundio_instream_get_latency - soundio.h (1166, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_instream_get_latency([CTypeDetails("Pointer<SoundIoInStream>")]System.IntPtr @instream, [CTypeDetails("Pointer<double>")]System.IntPtr @out_latency);
-
-        // function soundio_ring_buffer_create - soundio.h (1181, 42)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_ring_buffer_create([CTypeDetails("Pointer<SoundIo>")]System.IntPtr @soundio, int @requested_capacity);
-
-        // function soundio_ring_buffer_destroy - soundio.h (1182, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_ring_buffer_destroy([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer);
-
-        // function soundio_ring_buffer_capacity - soundio.h (1186, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_ring_buffer_capacity([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer);
-
-        // function soundio_ring_buffer_write_ptr - soundio.h (1189, 22)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_ring_buffer_write_ptr([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer);
-
-        // function soundio_ring_buffer_advance_write_ptr - soundio.h (1191, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_ring_buffer_advance_write_ptr([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer, int @count);
-
-        // function soundio_ring_buffer_read_ptr - soundio.h (1194, 22)
-        [DllImport(LibraryName)]
-        internal static extern System.IntPtr soundio_ring_buffer_read_ptr([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer);
-
-        // function soundio_ring_buffer_advance_read_ptr - soundio.h (1196, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_ring_buffer_advance_read_ptr([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer, int @count);
-
-        // function soundio_ring_buffer_fill_count - soundio.h (1199, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_ring_buffer_fill_count([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer);
-
-        // function soundio_ring_buffer_free_count - soundio.h (1202, 20)
-        [DllImport(LibraryName)]
-        internal static extern int soundio_ring_buffer_free_count([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer);
-
-        // function soundio_ring_buffer_clear - soundio.h (1205, 21)
-        [DllImport(LibraryName)]
-        internal static extern void soundio_ring_buffer_clear([CTypeDetails("Pointer<SoundIoRingBuffer>")]System.IntPtr @ring_buffer);
-
-    }
-
-    class Delegates
-    {
-        public delegate void delegate0(System.IntPtr p0);
-        public delegate void delegate1(System.IntPtr p0, int p1);
-        public delegate void delegate2();
-        public delegate void delegate3(System.IntPtr p0);
-        public delegate void delegate4(System.IntPtr p0, int p1, int p2);
-        public delegate void delegate5(System.IntPtr p0);
-        public delegate void delegate6(System.IntPtr p0, int p1);
-        public delegate void delegate7(System.IntPtr p0, int p1, int p2);
-        public delegate void delegate8(System.IntPtr p0);
-        public delegate void delegate9(System.IntPtr p0, int p1);
-    }
-
-    public struct Pointer<T>
-    {
-        public IntPtr Handle;
-        public static implicit operator IntPtr(Pointer<T> value) { return value.Handle; }
-        public static implicit operator Pointer<T>(IntPtr value) { return new Pointer<T>(value); }
-
-        public Pointer(IntPtr handle)
-        {
-            Handle = handle;
-        }
-
-        public override bool Equals(object obj)
-        {
-            return obj is Pointer<T> && this == (Pointer<T>)obj;
-        }
-
-        public override int GetHashCode()
-        {
-            return (int)Handle;
-        }
-
-        public static bool operator ==(Pointer<T> p1, Pointer<T> p2)
-        {
-            return p1.Handle == p2.Handle;
-        }
-
-        public static bool operator !=(Pointer<T> p1, Pointer<T> p2)
-        {
-            return p1.Handle != p2.Handle;
-        }
-    }
-    public struct ArrayOf<T> { }
-    public struct ConstArrayOf<T> { }
-    public class CTypeDetailsAttribute : Attribute
-    {
-        public CTypeDetailsAttribute(string value)
-        {
-            Value = value;
-        }
-
-        public string Value { get; set; }
-    }
-
-}

Ryujinx.Audio/Output/AudioOutputManager.cs

@@ -0,0 +1,256 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Common.Logging;
+using Ryujinx.Memory;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Output
+{
+    /// <summary>
+    /// The audio output manager.
+    /// </summary>
+    public class AudioOutputManager : IDisposable
+    {
+        private object _lock = new object();
+
+        /// <summary>
+        /// Lock used for session allocation.
+        /// </summary>
+        private object _sessionLock = new object();
+
+        /// <summary>
+        /// The session ids allocation table.
+        /// </summary>
+        private int[] _sessionIds;
+
+        /// <summary>
+        /// The device driver.
+        /// </summary>
+        private IHardwareDeviceDriver _deviceDriver;
+
+        /// <summary>
+        /// The events linked to each session.
+        /// </summary>
+        private IWritableEvent[] _sessionsBufferEvents;
+
+        /// <summary>
+        /// The <see cref="AudioOutputSystem"/> session instances.
+        /// </summary>
+        private AudioOutputSystem[] _sessions;
+
+        /// <summary>
+        /// The count of active sessions.
+        /// </summary>
+        private int _activeSessionCount;
+
+        /// <summary>
+        /// Create a new <see cref="AudioOutputManager"/>.
+        /// </summary>
+        public AudioOutputManager()
+        {
+            _sessionIds = new int[Constants.AudioOutSessionCountMax];
+            _sessions = new AudioOutputSystem[Constants.AudioOutSessionCountMax];
+            _activeSessionCount = 0;
+
+            for (int i = 0; i < _sessionIds.Length; i++)
+            {
+                _sessionIds[i] = i;
+            }
+        }
+
+        /// <summary>
+        /// Initialize the <see cref="AudioOutputManager"/>.
+        /// </summary>
+        /// <param name="deviceDriver">The device driver.</param>
+        /// <param name="sessionRegisterEvents">The events associated to each session.</param>
+        public void Initialize(IHardwareDeviceDriver deviceDriver, IWritableEvent[] sessionRegisterEvents)
+        {
+            _deviceDriver = deviceDriver;
+            _sessionsBufferEvents = sessionRegisterEvents;
+        }
+
+        /// <summary>
+        /// Acquire a new session id.
+        /// </summary>
+        /// <returns>A new session id.</returns>
+        private int AcquireSessionId()
+        {
+            lock (_sessionLock)
+            {
+                int index = _activeSessionCount;
+
+                Debug.Assert(index < _sessionIds.Length);
+
+                int sessionId = _sessionIds[index];
+
+                _sessionIds[index] = -1;
+
+                _activeSessionCount++;
+
+                Logger.Info?.Print(LogClass.AudioRenderer, $"Registered new output ({sessionId})");
+
+                return sessionId;
+            }
+        }
+
+        /// <summary>
+        /// Release a given <paramref name="sessionId"/>.
+        /// </summary>
+        /// <param name="sessionId">The session id to release.</param>
+        private void ReleaseSessionId(int sessionId)
+        {
+            lock (_sessionLock)
+            {
+                Debug.Assert(_activeSessionCount > 0);
+
+                int newIndex = --_activeSessionCount;
+
+                _sessionIds[newIndex] = sessionId;
+            }
+
+            Logger.Info?.Print(LogClass.AudioRenderer, $"Unregistered output ({sessionId})");
+        }
+
+        /// <summary>
+        /// Used to update audio output system.
+        /// </summary>
+        public void Update()
+        {
+            lock (_sessionLock)
+            {
+                foreach (AudioOutputSystem output in _sessions)
+                {
+                    output?.Update();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Register a new <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        /// <param name="output">The <see cref="AudioOutputSystem"/> to register.</param>
+        private void Register(AudioOutputSystem output)
+        {
+            lock (_sessionLock)
+            {
+                _sessions[output.GetSessionId()] = output;
+            }
+        }
+
+        /// <summary>
+        /// Unregister a new <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        /// <param name="output">The <see cref="AudioOutputSystem"/> to unregister.</param>
+        internal void Unregister(AudioOutputSystem output)
+        {
+            lock (_sessionLock)
+            {
+                int sessionId = output.GetSessionId();
+
+                _sessions[output.GetSessionId()] = null;
+
+                ReleaseSessionId(sessionId);
+            }
+        }
+
+        /// <summary>
+        /// Get the list of all audio outputs name.
+        /// </summary>
+        /// <returns>The list of all audio outputs name</returns>
+        public string[] ListAudioOuts()
+        {
+            return new string[] { Constants.DefaultDeviceOutputName };
+        }
+
+        /// <summary>
+        /// Open a new <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        /// <param name="outputDeviceName">The output device name selected by the <see cref="AudioOutputSystem"/></param>
+        /// <param name="outputConfiguration">The output audio configuration selected by the <see cref="AudioOutputSystem"/></param>
+        /// <param name="obj">The new <see cref="AudioOutputSystem"/></param>
+        /// <param name="memoryManager">The memory manager that will be used for all guest memory operations</param>
+        /// <param name="inputDeviceName">The input device name wanted by the user</param>
+        /// <param name="sampleFormat">The sample format to use</param>
+        /// <param name="parameter">The user configuration</param>
+        /// <param name="appletResourceUserId">The applet resource user id of the application</param>
+        /// <param name="processHandle">The process handle of the application</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode OpenAudioOut(out string outputDeviceName,
+                                       out AudioOutputConfiguration outputConfiguration,
+                                       out AudioOutputSystem obj,
+                                       IVirtualMemoryManager memoryManager,
+                                       string inputDeviceName,
+                                       SampleFormat sampleFormat,
+                                       ref AudioInputConfiguration parameter,
+                                       ulong appletResourceUserId,
+                                       uint processHandle)
+        {
+            int sessionId = AcquireSessionId();
+
+            _sessionsBufferEvents[sessionId].Clear();
+
+            IHardwareDeviceSession deviceSession = _deviceDriver.OpenDeviceSession(IHardwareDeviceDriver.Direction.Output, memoryManager, sampleFormat, parameter.SampleRate, parameter.ChannelCount);
+
+            AudioOutputSystem audioOut = new AudioOutputSystem(this, _lock, deviceSession, _sessionsBufferEvents[sessionId]);
+
+            ResultCode result = audioOut.Initialize(inputDeviceName, sampleFormat, ref parameter, sessionId);
+
+            if (result == ResultCode.Success)
+            {
+                outputDeviceName = audioOut.DeviceName;
+                outputConfiguration = new AudioOutputConfiguration
+                {
+                    ChannelCount  = audioOut.ChannelCount,
+                    SampleFormat  = audioOut.SampleFormat,
+                    SampleRate    = audioOut.SampleRate,
+                    AudioOutState = audioOut.GetState(),
+                };
+
+                obj = audioOut;
+
+                Register(audioOut);
+            }
+            else
+            {
+                ReleaseSessionId(sessionId);
+
+                obj = null;
+                outputDeviceName = null;
+                outputConfiguration = default;
+            }
+
+            return result;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                // Nothing to do here.
+            }
+        }
+    }
+}

Ryujinx.Audio/Output/AudioOutputSystem.cs

@@ -0,0 +1,373 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using System;
+
+namespace Ryujinx.Audio.Output
+{
+    /// <summary>
+    /// Audio output system.
+    /// </summary>
+    public class AudioOutputSystem : IDisposable
+    {
+        /// <summary>
+        /// The session id associated to the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        private int _sessionId;
+
+        /// <summary>
+        /// The session the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        private AudioDeviceSession _session;
+
+        /// <summary>
+        /// The target device name of the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        public string DeviceName { get; private set; }
+
+        /// <summary>
+        /// The target sample rate of the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        public uint SampleRate { get; private set; }
+
+        /// <summary>
+        /// The target channel count of the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        public uint ChannelCount { get; private set; }
+
+        /// <summary>
+        /// The target sample format of the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        public SampleFormat SampleFormat { get; private set; }
+
+        /// <summary>
+        /// The <see cref="AudioOutputManager"/> owning this.
+        /// </summary>
+        private AudioOutputManager _manager;
+
+        /// <summary>
+        /// THe lock of the parent.
+        /// </summary>
+        private object _parentLock;
+
+        /// <summary>
+        /// Create a new <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        /// <param name="manager">The manager instance</param>
+        /// <param name="parentLock">The lock of the manager</param>
+        /// <param name="deviceSession">The hardware device session</param>
+        /// <param name="bufferEvent">The buffer release event of the audio output</param>
+        public AudioOutputSystem(AudioOutputManager manager, object parentLock, IHardwareDeviceSession deviceSession, IWritableEvent bufferEvent)
+        {
+            _manager = manager;
+            _parentLock = parentLock;
+            _session = new AudioDeviceSession(deviceSession, bufferEvent);
+        }
+
+        /// <summary>
+        /// Get the default device name on the system.
+        /// </summary>
+        /// <returns>The default device name on the system.</returns>
+        private static string GetDeviceDefaultName()
+        {
+            return Constants.DefaultDeviceOutputName;
+        }
+
+        /// <summary>
+        /// Check if a given configuration and device name is valid on the system.
+        /// </summary>
+        /// <param name="configuration">The configuration to check.</param>
+        /// <param name="deviceName">The device name to check.</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        private static ResultCode IsConfigurationValid(ref AudioInputConfiguration configuration, string deviceName)
+        {
+            if (deviceName.Length != 0 && !deviceName.Equals(GetDeviceDefaultName()))
+            {
+                return ResultCode.DeviceNotFound;
+            }
+            else if (configuration.SampleRate != 0 && configuration.SampleRate != Constants.TargetSampleRate)
+            {
+                return ResultCode.UnsupportedSampleRate;
+            }
+            else if (configuration.ChannelCount != 0 && configuration.ChannelCount != 1 && configuration.ChannelCount != 2 && configuration.ChannelCount != 6)
+            {
+                return ResultCode.UnsupportedChannelConfiguration;
+            }
+
+            return ResultCode.Success;
+        }
+
+        /// <summary>
+        /// Get the released buffer event.
+        /// </summary>
+        /// <returns>The released buffer event</returns>
+        public IWritableEvent RegisterBufferEvent()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetBufferEvent();
+            }
+        }
+
+        /// <summary>
+        /// Update the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        public void Update()
+        {
+            lock (_parentLock)
+            {
+                _session.Update();
+            }
+        }
+
+        /// <summary>
+        /// Get the id of this session.
+        /// </summary>
+        /// <returns>The id of this session</returns>
+        public int GetSessionId()
+        {
+            return _sessionId;
+        }
+
+        /// <summary>
+        /// Initialize the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        /// <param name="inputDeviceName">The input device name wanted by the user</param>
+        /// <param name="sampleFormat">The sample format to use</param>
+        /// <param name="parameter">The user configuration</param>
+        /// <param name="sessionId">The session id associated to this <see cref="AudioOutputSystem"/></param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        public ResultCode Initialize(string inputDeviceName, SampleFormat sampleFormat, ref AudioInputConfiguration parameter, int sessionId)
+        {
+            _sessionId = sessionId;
+
+            ResultCode result = IsConfigurationValid(ref parameter, inputDeviceName);
+
+            if (result == ResultCode.Success)
+            {
+                if (inputDeviceName.Length == 0)
+                {
+                    DeviceName = GetDeviceDefaultName();
+                }
+                else
+                {
+                    DeviceName = inputDeviceName;
+                }
+
+                if (parameter.ChannelCount == 6)
+                {
+                    ChannelCount = 6;
+                }
+                else
+                {
+                    ChannelCount = 2;
+                }
+
+                SampleFormat = sampleFormat;
+                SampleRate   = Constants.TargetSampleRate;
+            }
+
+            return result;
+        }
+
+        /// <summary>
+        /// Append a new audio buffer to the audio output.
+        /// </summary>
+        /// <param name="bufferTag">The unique tag of this buffer.</param>
+        /// <param name="userBuffer">The buffer informations.</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        public ResultCode AppendBuffer(ulong bufferTag, ref AudioUserBuffer userBuffer)
+        {
+            lock (_parentLock)
+            {
+                AudioBuffer buffer = new AudioBuffer
+                {
+                    BufferTag   = bufferTag,
+                    DataPointer = userBuffer.Data,
+                    DataSize    = userBuffer.DataSize
+                };
+
+                if (_session.AppendBuffer(buffer))
+                {
+                    return ResultCode.Success;
+                }
+
+                return ResultCode.BufferRingFull;
+            }
+        }
+
+        /// <summary>
+        /// Get the release buffers.
+        /// </summary>
+        /// <param name="releasedBuffers">The buffer to write the release buffers</param>
+        /// <param name="releasedCount">The count of released buffers</param>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success.</returns>
+        public ResultCode GetReleasedBuffer(Span<ulong> releasedBuffers, out uint releasedCount)
+        {
+            releasedCount = 0;
+
+            // Ensure that the first entry is set to zero if no entries are returned.
+            if (releasedBuffers.Length > 0)
+            {
+                releasedBuffers[0] = 0;
+            }
+
+            lock (_parentLock)
+            {
+                for (int i = 0; i < releasedBuffers.Length; i++)
+                {
+                    if (!_session.TryPopReleasedBuffer(out AudioBuffer buffer))
+                    {
+                        break;
+                    }
+
+                    releasedBuffers[i] = buffer.BufferTag;
+                    releasedCount++;
+                }
+            }
+
+            return ResultCode.Success;
+        }
+
+        /// <summary>
+        /// Get the current state of the <see cref="AudioOutputSystem"/>.
+        /// </summary>
+        /// <returns>Return the curent sta\te of the <see cref="AudioOutputSystem"/></returns>
+        /// <returns></returns>
+        public AudioDeviceState GetState()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetState();
+            }
+        }
+
+        /// <summary>
+        /// Start the audio session.
+        /// </summary>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode Start()
+        {
+            lock (_parentLock)
+            {
+                return _session.Start();
+            }
+        }
+
+        /// <summary>
+        /// Stop the audio session.
+        /// </summary>
+        /// <returns>A <see cref="ResultCode"/> reporting an error or a success</returns>
+        public ResultCode Stop()
+        {
+            lock (_parentLock)
+            {
+                return _session.Stop();
+            }
+        }
+
+        /// <summary>
+        /// Get the volume of the session.
+        /// </summary>
+        /// <returns>The volume of the session</returns>
+        public float GetVolume()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetVolume();
+            }
+        }
+
+        /// <summary>
+        /// Set the volume of the session.
+        /// </summary>
+        /// <param name="volume">The new volume to set</param>
+        public void SetVolume(float volume)
+        {
+            lock (_parentLock)
+            {
+                 _session.SetVolume(volume);
+            }
+        }
+
+        /// <summary>
+        /// Get the count of buffer currently in use (server + driver side).
+        /// </summary>
+        /// <returns>The count of buffer currently in use</returns>
+        public uint GetBufferCount()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetBufferCount();
+            }
+        }
+
+        /// <summary>
+        /// Check if a buffer is present.
+        /// </summary>
+        /// <param name="bufferTag">The unique tag of the buffer</param>
+        /// <returns>Return true if a buffer is present</returns>
+        public bool ContainsBuffer(ulong bufferTag)
+        {
+            lock (_parentLock)
+            {
+                return _session.ContainsBuffer(bufferTag);
+            }
+        }
+
+        /// <summary>
+        /// Get the count of sample played in this session.
+        /// </summary>
+        /// <returns>The count of sample played in this session</returns>
+        public ulong GetPlayedSampleCount()
+        {
+            lock (_parentLock)
+            {
+                return _session.GetPlayedSampleCount();
+            }
+        }
+
+        /// <summary>
+        /// Flush all buffers to the initial state.
+        /// </summary>
+        /// <returns>True if any buffers was flushed</returns>
+        public bool FlushBuffers()
+        {
+            lock (_parentLock)
+            {
+                return _session.FlushBuffers();
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _session.Dispose();
+
+                _manager.Unregister(this);
+            }
+        }
+    }
+}

Ryujinx.Audio/PlaybackState.cs

@@ -1,17 +0,0 @@
-namespace Ryujinx.Audio
-{
-    /// <summary>
-    /// The playback state of a track
-    /// </summary>
-    public enum PlaybackState
-    {
-        /// <summary>
-        ///  The track is currently playing
-        /// </summary>
-        Playing = 0,
-        /// <summary>
-        /// The track is currently stopped
-        /// </summary>
-        Stopped = 1
-    }
-}

Ryujinx.Audio/ReleaseCallback.cs

@@ -1,4 +0,0 @@
-namespace Ryujinx.Audio
-{
-    public delegate void ReleaseCallback();
-}

Ryujinx.Audio/Renderer/Common/AuxiliaryBufferAddresses.cs

@@ -0,0 +1,30 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct AuxiliaryBufferAddresses
+    {
+        public ulong SendBufferInfo;
+        public ulong SendBufferInfoBase;
+        public ulong ReturnBufferInfo;
+        public ulong ReturnBufferInfoBase;
+    }
+}

Ryujinx.Audio/Renderer/Common/BehaviourParameter.cs

@@ -0,0 +1,67 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Represents the input parameter for <see cref="Server.BehaviourContext"/>.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct BehaviourParameter
+    {
+        /// <summary>
+        /// The current audio renderer revision in use.
+        /// </summary>
+        public int UserRevision;
+
+        /// <summary>
+        /// Reserved/padding.
+        /// </summary>
+        private uint _padding;
+
+        /// <summary>
+        /// The flags given controlling behaviour of the audio renderer
+        /// </summary>
+        /// <remarks>See <see cref="Server.BehaviourContext.UpdateFlags(ulong)"/> and <see cref="Server.BehaviourContext.IsMemoryPoolForceMappingEnabled"/>.</remarks>
+        public ulong Flags;
+
+        /// <summary>
+        /// Represents an error during <see cref="Server.AudioRenderSystem.Update(System.Memory{byte}, System.Memory{byte}, System.ReadOnlyMemory{byte})"/>.
+        /// </summary>
+        [StructLayout(LayoutKind.Sequential, Pack = 1)]
+        public struct ErrorInfo
+        {
+            /// <summary>
+            /// The error code to report.
+            /// </summary>
+            public ResultCode ErrorCode;
+
+            /// <summary>
+            /// Reserved/padding.
+            /// </summary>
+            private uint _padding;
+
+            /// <summary>
+            /// Extra information given with the <see cref="ResultCode"/>
+            /// </summary>
+            /// <remarks>This is usually used to report a faulting cpu address when a <see cref="Server.MemoryPool.MemoryPoolState"/> mapping fail.</remarks>
+            public ulong ExtraErrorInfo;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Common/EdgeMatrix.cs

@@ -0,0 +1,167 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Utils;
+using Ryujinx.Common;
+using System;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Represents a adjacent matrix.
+    /// </summary>
+    /// <remarks>This is used for splitter routing.</remarks>
+    public class EdgeMatrix
+    {
+        /// <summary>
+        /// Backing <see cref="BitArray"/> used for node connections.
+        /// </summary>
+        private BitArray _storage;
+
+        /// <summary>
+        /// The count of nodes of the current instance.
+        /// </summary>
+        private int _nodeCount;
+
+        /// <summary>
+        /// Get the required work buffer size memory needed for the <see cref="EdgeMatrix"/>.
+        /// </summary>
+        /// <param name="nodeCount">The count of nodes.</param>
+        /// <returns>The size required for the given <paramref name="nodeCount"/>.</returns>
+        public static int GetWorkBufferSize(int nodeCount)
+        {
+            int size = BitUtils.AlignUp(nodeCount * nodeCount, Constants.BufferAlignment);
+
+            return size / Unsafe.SizeOf<byte>();
+        }
+
+        /// <summary>
+        /// Initializes the <see cref="EdgeMatrix"/> instance with backing memory.
+        /// </summary>
+        /// <param name="edgeMatrixWorkBuffer">The backing memory.</param>
+        /// <param name="nodeCount">The count of nodes.</param>
+        public void Initialize(Memory<byte> edgeMatrixWorkBuffer, int nodeCount)
+        {
+            Debug.Assert(edgeMatrixWorkBuffer.Length >= GetWorkBufferSize(nodeCount));
+
+            _storage = new BitArray(edgeMatrixWorkBuffer);
+
+            _nodeCount = nodeCount;
+
+            _storage.Reset();
+        }
+
+        /// <summary>
+        /// Test if the bit at the given index is set.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        /// <returns>Returns true if the bit at the given index is set</returns>
+        public bool Test(int index)
+        {
+            return _storage.Test(index);
+        }
+
+        /// <summary>
+        /// Reset all bits in the storage.
+        /// </summary>
+        public void Reset()
+        {
+            _storage.Reset();
+        }
+
+        /// <summary>
+        /// Reset the bit at the given index.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        public void Reset(int index)
+        {
+            _storage.Reset(index);
+        }
+
+        /// <summary>
+        /// Set the bit at the given index.
+        /// </summary>
+        /// <param name="index">A bit index.</param>
+        public void Set(int index)
+        {
+            _storage.Set(index);
+        }
+
+        /// <summary>
+        /// Connect a given source to a given destination.
+        /// </summary>
+        /// <param name="source">The source index.</param>
+        /// <param name="destination">The destination index.</param>
+        public void Connect(int source, int destination)
+        {
+            Debug.Assert(source < _nodeCount);
+            Debug.Assert(destination < _nodeCount);
+
+            _storage.Set(_nodeCount * source + destination);
+        }
+
+        /// <summary>
+        /// Check if the given source is connected to the given destination.
+        /// </summary>
+        /// <param name="source">The source index.</param>
+        /// <param name="destination">The destination index.</param>
+        /// <returns>Returns true if the given source is connected to the given destination.</returns>
+        public bool Connected(int source, int destination)
+        {
+            Debug.Assert(source < _nodeCount);
+            Debug.Assert(destination < _nodeCount);
+
+            return _storage.Test(_nodeCount * source + destination);
+        }
+
+        /// <summary>
+        /// Disconnect a given source from a given destination.
+        /// </summary>
+        /// <param name="source">The source index.</param>
+        /// <param name="destination">The destination index.</param>
+        public void Disconnect(int source, int destination)
+        {
+            Debug.Assert(source < _nodeCount);
+            Debug.Assert(destination < _nodeCount);
+
+            _storage.Reset(_nodeCount * source + destination);
+        }
+
+        /// <summary>
+        /// Remove all edges from a given source.
+        /// </summary>
+        /// <param name="source">The source index.</param>
+        public void RemoveEdges(int source)
+        {
+            for (int i = 0; i < _nodeCount; i++)
+            {
+                Disconnect(source, i);
+            }
+        }
+
+        /// <summary>
+        /// Get the total node count.
+        /// </summary>
+        /// <returns>The total node count.</returns>
+        public int GetNodeCount()
+        {
+            return _nodeCount;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Common/EffectType.cs

@@ -0,0 +1,60 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// The type of an effect.
+    /// </summary>
+    public enum EffectType : byte
+    {
+        /// <summary>
+        /// Invalid effect.
+        /// </summary>
+        Invalid,
+
+        /// <summary>
+        /// Effect applying additional mixing capability.
+        /// </summary>
+        BufferMix,
+
+        /// <summary>
+        /// Effect applying custom user effect (via auxiliary buffers).
+        /// </summary>
+        AuxiliaryBuffer,
+
+        /// <summary>
+        /// Effect applying a delay.
+        /// </summary>
+        Delay,
+
+        /// <summary>
+        /// Effect applying a reverberation effect via a given preset.
+        /// </summary>
+        Reverb,
+
+        /// <summary>
+        /// Effect applying a 3D reverberation effect via a given preset.
+        /// </summary>
+        Reverb3d,
+
+        /// <summary>
+        /// Effect applying a biquad filter.
+        /// </summary>
+        BiquadFilter
+    }
+}

Ryujinx.Audio/Renderer/Common/MemoryPoolUserState.cs

@@ -0,0 +1,60 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Represents the state of a memory pool.
+    /// </summary>
+    public enum MemoryPoolUserState : uint
+    {
+        /// <summary>
+        /// Invalid state.
+        /// </summary>
+        Invalid = 0,
+
+        /// <summary>
+        /// The memory pool is new. (client side only)
+        /// </summary>
+        New = 1,
+
+        /// <summary>
+        /// The user asked to detach the memory pool from the <see cref="Dsp.AudioProcessor"/>.
+        /// </summary>
+        RequestDetach = 2,
+
+        /// <summary>
+        /// The memory pool is detached from the <see cref="Dsp.AudioProcessor"/>.
+        /// </summary>
+        Detached = 3,
+
+        /// <summary>
+        /// The user asked to attach the memory pool to the <see cref="Dsp.AudioProcessor"/>.
+        /// </summary>
+        RequestAttach = 4,
+
+        /// <summary>
+        /// The memory pool is attached to the <see cref="Dsp.AudioProcessor"/>.
+        /// </summary>
+        Attached = 5,
+
+        /// <summary>
+        /// The memory pool is released. (client side only)
+        /// </summary>
+        Released = 6
+    }
+}

Ryujinx.Audio/Renderer/Common/NodeIdHelper.cs

@@ -0,0 +1,45 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Helper for manipulating node ids.
+    /// </summary>
+    public static class NodeIdHelper
+    {
+        /// <summary>
+        /// Get the type of a node from a given node id.
+        /// </summary>
+        /// <param name="nodeId">Id of the node.</param>
+        /// <returns>The type of the node.</returns>
+        public static NodeIdType GetType(int nodeId)
+        {
+            return (NodeIdType)(nodeId >> 28);
+        }
+
+        /// <summary>
+        /// Get the base of a node from a given node id.
+        /// </summary>
+        /// <param name="nodeId">Id of the node.</param>
+        /// <returns>The base of the node.</returns>
+        public static int GetBase(int nodeId)
+        {
+            return (nodeId >> 16) & 0xFFF;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Common/NodeIdType.cs

@@ -0,0 +1,50 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// The type of a node.
+    /// </summary>
+    public enum NodeIdType : byte
+    {
+        /// <summary>
+        /// Invalid node id.
+        /// </summary>
+        Invalid = 0,
+
+        /// <summary>
+        /// Voice related node id. (data source, biquad filter, ...)
+        /// </summary>
+        Voice = 1,
+
+        /// <summary>
+        /// Mix related node id. (mix, effects, splitters, ...)
+        /// </summary>
+        Mix = 2,
+
+        /// <summary>
+        /// Sink related node id. (device &amp; circular buffer sink)
+        /// </summary>
+        Sink = 3,
+
+        /// <summary>
+        /// Performance monitoring related node id (performance commands)
+        /// </summary>
+        Performance = 15
+    }
+}

Ryujinx.Audio/Renderer/Common/NodeStates.cs

@@ -0,0 +1,246 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Utils;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    public class NodeStates
+    {
+        private class Stack
+        {
+            private Memory<int> _storage;
+            private int _index;
+
+            private int _nodeCount;
+
+            public void Reset(Memory<int> storage, int nodeCount)
+            {
+                Debug.Assert(storage.Length * sizeof(int) >= CalcBufferSize(nodeCount));
+
+                _storage = storage;
+                _index = 0;
+                _nodeCount = nodeCount;
+            }
+
+            public int GetCurrentCount()
+            {
+                return _index;
+            }
+
+            public void Push(int data)
+            {
+                Debug.Assert(_index + 1 <= _nodeCount);
+
+                _storage.Span[_index++] = data;
+            }
+
+            public int Pop()
+            {
+                Debug.Assert(_index > 0);
+
+                return _storage.Span[--_index];
+            }
+
+            public int Top()
+            {
+                return _storage.Span[_index - 1];
+            }
+
+            public static int CalcBufferSize(int nodeCount)
+            {
+                return nodeCount * sizeof(int);
+            }
+        }
+
+        private int _nodeCount;
+        private EdgeMatrix _discovered;
+        private EdgeMatrix _finished;
+        private Memory<int> _resultArray;
+        private Stack _stack;
+        private int _tsortResultIndex;
+
+        private enum NodeState : byte
+        {
+            Unknown,
+            Discovered,
+            Finished
+        }
+
+        public NodeStates()
+        {
+            _stack = new Stack();
+            _discovered = new EdgeMatrix();
+            _finished = new EdgeMatrix();
+        }
+
+        public static int GetWorkBufferSize(int nodeCount)
+        {
+            return Stack.CalcBufferSize(nodeCount * nodeCount) + 0xC * nodeCount + 2 * EdgeMatrix.GetWorkBufferSize(nodeCount);
+        }
+
+        public void Initialize(Memory<byte> nodeStatesWorkBuffer, int nodeCount)
+        {
+            int workBufferSize = GetWorkBufferSize(nodeCount);
+
+            Debug.Assert(nodeStatesWorkBuffer.Length >= workBufferSize);
+
+            _nodeCount = nodeCount;
+
+            int edgeMatrixWorkBufferSize = EdgeMatrix.GetWorkBufferSize(nodeCount);
+
+            _discovered.Initialize(nodeStatesWorkBuffer.Slice(0, edgeMatrixWorkBufferSize), nodeCount);
+            _finished.Initialize(nodeStatesWorkBuffer.Slice(edgeMatrixWorkBufferSize, edgeMatrixWorkBufferSize), nodeCount);
+
+            nodeStatesWorkBuffer = nodeStatesWorkBuffer.Slice(edgeMatrixWorkBufferSize * 2);
+
+            _resultArray = SpanMemoryManager<int>.Cast(nodeStatesWorkBuffer.Slice(0, sizeof(int) * nodeCount));
+
+            nodeStatesWorkBuffer = nodeStatesWorkBuffer.Slice(sizeof(int) * nodeCount);
+
+            Memory<int> stackWorkBuffer = SpanMemoryManager<int>.Cast(nodeStatesWorkBuffer.Slice(0, Stack.CalcBufferSize(nodeCount * nodeCount)));
+
+            _stack.Reset(stackWorkBuffer, nodeCount * nodeCount);
+        }
+
+        private void Reset()
+        {
+            _discovered.Reset();
+            _finished.Reset();
+            _tsortResultIndex = 0;
+            _resultArray.Span.Fill(-1);
+        }
+
+        private NodeState GetState(int index)
+        {
+            Debug.Assert(index < _nodeCount);
+
+            if (_discovered.Test(index))
+            {
+                Debug.Assert(!_finished.Test(index));
+
+                return NodeState.Discovered;
+            }
+            else if (_finished.Test(index))
+            {
+                Debug.Assert(!_discovered.Test(index));
+
+                return NodeState.Finished;
+            }
+
+            return NodeState.Unknown;
+        }
+
+        private void SetState(int index, NodeState state)
+        {
+            switch (state)
+            {
+                case NodeState.Unknown:
+                    _discovered.Reset(index);
+                    _finished.Reset(index);
+                    break;
+                case NodeState.Discovered:
+                    _discovered.Set(index);
+                    _finished.Reset(index);
+                    break;
+                case NodeState.Finished:
+                    _finished.Set(index);
+                    _discovered.Reset(index);
+                    break;
+            }
+        }
+
+        private void PushTsortResult(int index)
+        {
+            Debug.Assert(index < _nodeCount);
+
+            _resultArray.Span[_tsortResultIndex++] = index;
+        }
+
+        public ReadOnlySpan<int> GetTsortResult()
+        {
+            return _resultArray.Span.Slice(0, _tsortResultIndex);
+        }
+
+        public bool Sort(EdgeMatrix edgeMatrix)
+        {
+            Reset();
+
+            if (_nodeCount <= 0)
+            {
+                return true;
+            }
+
+            for (int i = 0; i < _nodeCount; i++)
+            {
+                if (GetState(i) == NodeState.Unknown)
+                {
+                    _stack.Push(i);
+                }
+
+                while (_stack.GetCurrentCount() > 0)
+                {
+                    int topIndex = _stack.Top();
+
+                    NodeState topState = GetState(topIndex);
+
+                    if (topState == NodeState.Discovered)
+                    {
+                        SetState(topIndex, NodeState.Finished);
+                        PushTsortResult(topIndex);
+                        _stack.Pop();
+                    }
+                    else if (topState == NodeState.Finished)
+                    {
+                        _stack.Pop();
+                    }
+                    else
+                    {
+                        if (topState == NodeState.Unknown)
+                        {
+                            SetState(topIndex, NodeState.Discovered);
+                        }
+
+                        for (int j = 0; j < edgeMatrix.GetNodeCount(); j++)
+                        {
+                            if (edgeMatrix.Connected(topIndex, j))
+                            {
+                                NodeState jState = GetState(j);
+
+                                if (jState == NodeState.Unknown)
+                                {
+                                    _stack.Push(j);
+                                }
+                                // Found a loop, reset and propagate rejection.
+                                else if (jState == NodeState.Discovered)
+                                {
+                                    Reset();
+
+                                    return false;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            return true;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Common/PerformanceDetailType.cs

@@ -0,0 +1,34 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    public enum PerformanceDetailType : byte
+    {
+        Unknown,
+        PcmInt16,
+        Adpcm,
+        VolumeRamp,
+        BiquadFilter,
+        Mix,
+        Delay,
+        Aux,
+        Reverb,
+        Reverb3d,
+        PcmFloat
+    }
+}

Ryujinx.Audio/Renderer/Common/PerformanceEntryType.cs

@@ -0,0 +1,28 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    public enum PerformanceEntryType : byte
+    {
+        Invalid,
+        Voice,
+        SubMix,
+        FinalMix,
+        Sink
+    }
+}

Ryujinx.Audio/Renderer/Common/PlayState.cs

@@ -0,0 +1,40 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Common play state.
+    /// </summary>
+    public enum PlayState : byte
+    {
+        /// <summary>
+        /// The user request the voice to be started.
+        /// </summary>
+        Start,
+
+        /// <summary>
+        /// The user request the voice to be stopped.
+        /// </summary>
+        Stop,
+
+        /// <summary>
+        /// The user request the voice to be paused.
+        /// </summary>
+        Pause
+    }
+}

Ryujinx.Audio/Renderer/Common/ReverbEarlyMode.cs

@@ -0,0 +1,50 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Early reverb reflection.
+    /// </summary>
+    public enum ReverbEarlyMode : uint
+    {
+        /// <summary>
+        /// Room early reflection. (small acoustic space, fast reflection)
+        /// </summary>
+        Room,
+
+        /// <summary>
+        /// Chamber early reflection. (bigger than <see cref="Room"/>'s acoustic space, short reflection)
+        /// </summary>
+        Chamber,
+
+        /// <summary>
+        /// Hall early reflection. (large acoustic space, warm reflection)
+        /// </summary>
+        Hall,
+
+        /// <summary>
+        /// Cathedral early reflection. (very large acoustic space, pronounced bright reflection)
+        /// </summary>
+        Cathedral,
+
+        /// <summary>
+        /// No early reflection.
+        /// </summary>
+        Disabled
+    }
+}

Ryujinx.Audio/Renderer/Common/ReverbLateMode.cs

@@ -0,0 +1,55 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Late reverb reflection.
+    /// </summary>
+    public enum ReverbLateMode : uint
+    {
+        /// <summary>
+        /// Room late reflection. (small acoustic space, fast reflection)
+        /// </summary>
+        Room,
+
+        /// <summary>
+        /// Hall late reflection. (large acoustic space, warm reflection)
+        /// </summary>
+        Hall,
+
+        /// <summary>
+        /// Classic plate late reflection. (clean distinctive reverb)
+        /// </summary>
+        Plate,
+
+        /// <summary>
+        /// Cathedral late reflection. (very large acoustic space, pronounced bright reflection)
+        /// </summary>
+        Cathedral,
+
+        /// <summary>
+        /// Do not apply any delay. (max delay)
+        /// </summary>
+        NoDelay,
+
+        /// <summary>
+        /// Max delay. (used for delay line limits)
+        /// </summary>
+        Limit = NoDelay
+    }
+}

Ryujinx.Audio/Renderer/Common/SinkType.cs

@@ -0,0 +1,40 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// The type of a sink.
+    /// </summary>
+    public enum SinkType : byte
+    {
+        /// <summary>
+        /// The sink is in an invalid state.
+        /// </summary>
+        Invalid,
+
+        /// <summary>
+        /// The sink is a device.
+        /// </summary>
+        Device,
+
+        /// <summary>
+        /// The sink is a circular buffer.
+        /// </summary>
+        CircularBuffer
+    }
+}

Ryujinx.Audio/Renderer/Common/UpdateDataHeader.cs

@@ -0,0 +1,50 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Update data header used for input and output of <see cref="Server.AudioRenderSystem.Update(System.Memory{byte}, System.Memory{byte}, System.ReadOnlyMemory{byte})"/>.
+    /// </summary>
+    public struct UpdateDataHeader
+    {
+        public int Revision;
+        public uint BehaviourSize;
+        public uint MemoryPoolsSize;
+        public uint VoicesSize;
+        public uint VoiceResourcesSize;
+        public uint EffectsSize;
+        public uint MixesSize;
+        public uint SinksSize;
+        public uint PerformanceBufferSize;
+        public uint Unknown24;
+        public uint RenderInfoSize;
+
+        private unsafe fixed int _reserved[4];
+
+        public uint TotalSize;
+
+        public void Initialize(int revision)
+        {
+            Revision = revision;
+
+            TotalSize = (uint)Unsafe.SizeOf<UpdateDataHeader>();
+        }
+    }
+}

Ryujinx.Audio/Renderer/Common/VoiceUpdateState.cs

@@ -0,0 +1,121 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Dsp.State;
+using Ryujinx.Common.Memory;
+using Ryujinx.Common.Utilities;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// Represent the update state of a voice.
+    /// </summary>
+    /// <remarks>This is shared between the server and audio processor.</remarks>
+    [StructLayout(LayoutKind.Sequential, Pack = Align)]
+    public struct VoiceUpdateState
+    {
+        public const int Align = 0x10;
+        public const int BiquadStateOffset = 0x0;
+        public const int BiquadStateSize = 0x10;
+
+        /// <summary>
+        /// The state of the biquad filters of this voice.
+        /// </summary>
+        public Array2<BiquadFilterState> BiquadFilterState;
+
+        /// <summary>
+        /// The total amount of samples that was played.
+        /// </summary>
+        /// <remarks>This is reset to 0 when a <see cref="WaveBuffer"/> finishes playing and <see cref="WaveBuffer.IsEndOfStream"/> is set.</remarks>
+        /// <remarks>This is reset to 0 when looping while <see cref="Parameter.VoiceInParameter.DecodingBehaviour.PlayedSampleCountResetWhenLooping"/> is set.</remarks>
+        public ulong PlayedSampleCount;
+
+        /// <summary>
+        /// The current sample offset in the <see cref="WaveBuffer"/> pointed by <see cref="WaveBufferIndex"/>.
+        /// </summary>
+        public int Offset;
+
+        /// <summary>
+        /// The current index of the <see cref="WaveBuffer"/> in use.
+        /// </summary>
+        public uint WaveBufferIndex;
+
+        private WaveBufferValidArray _isWaveBufferValid;
+
+        /// <summary>
+        /// The total amount of <see cref="WaveBuffer"/> consumed.
+        /// </summary>
+        public uint WaveBufferConsumed;
+
+        /// <summary>
+        /// Pitch used for Sample Rate Conversion.
+        /// </summary>
+        public Array8<short> Pitch;
+
+        public float Fraction;
+
+        /// <summary>
+        /// The ADPCM loop context when <see cref="SampleFormat.Adpcm"/> is in use.
+        /// </summary>
+        public AdpcmLoopContext LoopContext;
+
+        /// <summary>
+        /// The last samples after a mix ramp.
+        /// </summary>
+        /// <remarks>This is used for depop (to perform voice drop).</remarks>
+        public Array24<float> LastSamples;
+
+        /// <summary>
+        /// The current count of loop performed.
+        /// </summary>
+        public int LoopCount;
+
+        [StructLayout(LayoutKind.Sequential, Size = 1 * Constants.VoiceWaveBufferCount, Pack = 1)]
+        private struct WaveBufferValidArray { }
+
+        /// <summary>
+        /// Contains information of <see cref="WaveBuffer"/> validity.
+        /// </summary>
+        public Span<bool> IsWaveBufferValid => SpanHelpers.AsSpan<WaveBufferValidArray, bool>(ref _isWaveBufferValid);
+
+        /// <summary>
+        /// Mark the current <see cref="WaveBuffer"/> as played and switch to the next one.
+        /// </summary>
+        /// <param name="waveBuffer">The current <see cref="WaveBuffer"/></param>
+        /// <param name="waveBufferIndex">The wavebuffer index.</param>
+        /// <param name="waveBufferConsumed">The amount of wavebuffers consumed.</param>
+        /// <param name="playedSampleCount">The total count of sample played.</param>
+        public void MarkEndOfBufferWaveBufferProcessing(ref WaveBuffer waveBuffer, ref int waveBufferIndex, ref uint waveBufferConsumed, ref ulong playedSampleCount)
+        {
+            IsWaveBufferValid[waveBufferIndex++] = false;
+            LoopCount = 0;
+            waveBufferConsumed++;
+
+            if (waveBufferIndex >= Constants.VoiceWaveBufferCount)
+            {
+                waveBufferIndex = 0;
+            }
+
+            if (waveBuffer.IsEndOfStream)
+            {
+                playedSampleCount = 0;
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Common/WaveBuffer.cs

@@ -0,0 +1,99 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Runtime.InteropServices;
+
+using DspAddr = System.UInt64;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    /// <summary>
+    /// A wavebuffer used for data source commands.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct WaveBuffer
+    {
+        /// <summary>
+        /// The DSP address of the sample data of the wavebuffer.
+        /// </summary>
+        public DspAddr Buffer;
+
+        /// <summary>
+        /// The DSP address of the context of the wavebuffer.
+        /// </summary>
+        /// <remarks>Only used by <see cref="SampleFormat.Adpcm"/>.</remarks>
+        public DspAddr Context;
+
+        /// <summary>
+        /// The size of the sample buffer data.
+        /// </summary>
+        public uint BufferSize;
+
+        /// <summary>
+        /// The size of the context buffer.
+        /// </summary>
+        public uint ContextSize;
+
+        /// <summary>
+        /// First sample to play on the wavebuffer.
+        /// </summary>
+        public uint StartSampleOffset;
+
+        /// <summary>
+        /// Last sample to play on the wavebuffer.
+        /// </summary>
+        public uint EndSampleOffset;
+
+        /// <summary>
+        /// First sample to play when looping the wavebuffer.
+        /// </summary>
+        /// <remarks>
+        /// If <see cref="LoopStartSampleOffset"/> or <see cref="LoopEndSampleOffset"/> is equal to zero,, it will default to <see cref="StartSampleOffset"/> and <see cref="EndSampleOffset"/>.
+        /// </remarks>
+        public uint LoopStartSampleOffset;
+
+        /// <summary>
+        /// Last sample to play when looping the wavebuffer.
+        /// </summary>
+        /// <remarks>
+        /// If <see cref="LoopStartSampleOffset"/> or <see cref="LoopEndSampleOffset"/> is equal to zero, it will default to <see cref="StartSampleOffset"/> and <see cref="EndSampleOffset"/>.
+        /// </remarks>
+        public uint LoopEndSampleOffset;
+
+        /// <summary>
+        /// The max loop count.
+        /// </summary>
+        public int LoopCount;
+
+        /// <summary>
+        /// Set to true if the wavebuffer is looping.
+        /// </summary>
+        [MarshalAs(UnmanagedType.I1)]
+        public bool Looping;
+
+        /// <summary>
+        /// Set to true if the wavebuffer is the end of stream.
+        /// </summary>
+        [MarshalAs(UnmanagedType.I1)]
+        public bool IsEndOfStream;
+
+        /// <summary>
+        /// Padding/Reserved.
+        /// </summary>
+        private ushort _padding;
+    }
+}

Ryujinx.Audio/Renderer/Common/WorkBufferAllocator.cs

@@ -0,0 +1,78 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Utils;
+using Ryujinx.Common;
+using System;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Common
+{
+    public class WorkBufferAllocator
+    {
+        public Memory<byte> BackingMemory { get; }
+
+        public ulong Offset { get; private set; }
+
+        public WorkBufferAllocator(Memory<byte> backingMemory)
+        {
+            BackingMemory = backingMemory;
+        }
+
+        public Memory<byte> Allocate(ulong size, int align)
+        {
+            Debug.Assert(align != 0);
+
+            if (size != 0)
+            {
+                ulong alignedOffset = BitUtils.AlignUp(Offset, align);
+
+                if (alignedOffset + size <= (ulong)BackingMemory.Length)
+                {
+                    Memory<byte> result = BackingMemory.Slice((int)alignedOffset, (int)size);
+
+                    Offset = alignedOffset + size;
+
+                    // Clear the memory to be sure that is does not contain any garbage.
+                    result.Span.Fill(0);
+
+                    return result;
+                }
+            }
+
+            return Memory<byte>.Empty;
+        }
+
+        public Memory<T> Allocate<T>(ulong count, int align) where T: unmanaged
+        {
+            Memory<byte> allocatedMemory = Allocate((ulong)Unsafe.SizeOf<T>() * count, align);
+
+            if (allocatedMemory.IsEmpty)
+            {
+                return Memory<T>.Empty;
+            }
+
+            return SpanMemoryManager<T>.Cast(allocatedMemory);
+        }
+
+        public static ulong GetTargetSize<T>(ulong currentSize, ulong count, int align) where T: unmanaged
+        {
+            return BitUtils.AlignUp(currentSize, align) + (ulong)Unsafe.SizeOf<T>() * count;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Device/VirtualDevice.cs

@@ -0,0 +1,84 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Device
+{
+    /// <summary>
+    /// Represents a virtual device used by IAudioDevice.
+    /// </summary>
+    public class VirtualDevice
+    {
+        /// <summary>
+        /// All the defined virtual devices.
+        /// </summary>
+        public static readonly VirtualDevice[] Devices = new VirtualDevice[4]
+        {
+            new VirtualDevice("AudioStereoJackOutput", 2),
+            new VirtualDevice("AudioBuiltInSpeakerOutput", 2),
+            new VirtualDevice("AudioTvOutput", 6),
+            new VirtualDevice("AudioUsbDeviceOutput", 2),
+        };
+
+        /// <summary>
+        /// The name of the <see cref="VirtualDevice"/>.
+        /// </summary>
+        public string Name { get; }
+
+        /// <summary>
+        /// The count of channels supported by the <see cref="VirtualDevice"/>.
+        /// </summary>
+        public uint ChannelCount { get; }
+
+        /// <summary>
+        /// The system master volume of the <see cref="VirtualDevice"/>.
+        /// </summary>
+        public float MasterVolume { get; private set; }
+
+        /// <summary>
+        /// Create a new <see cref="VirtualDevice"/> instance.
+        /// </summary>
+        /// <param name="name">The name of the <see cref="VirtualDevice"/>.</param>
+        /// <param name="channelCount">The count of channels supported by the <see cref="VirtualDevice"/>.</param>
+        private VirtualDevice(string name, uint channelCount)
+        {
+            Name = name;
+            ChannelCount = channelCount;
+        }
+
+        /// <summary>
+        /// Update the master volume of the <see cref="VirtualDevice"/>.
+        /// </summary>
+        /// <param name="volume">The new master volume.</param>
+        public void UpdateMasterVolume(float volume)
+        {
+            Debug.Assert(volume >= 0.0f && volume <= 1.0f);
+
+            MasterVolume = volume;
+        }
+
+        /// <summary>
+        /// Check if the <see cref="VirtualDevice"/> is a usb device.
+        /// </summary>
+        /// <returns>Returns true if the <see cref="VirtualDevice"/> is a usb device.</returns>
+        public bool IsUsbDevice()
+        {
+            return Name.Equals("AudioUsbDeviceOutput");
+        }
+    }
+}

Ryujinx.Audio/Renderer/Device/VirtualDeviceSession.cs

@@ -0,0 +1,44 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Device
+{
+    /// <summary>
+    /// Represents a virtual device session used by IAudioDevice.
+    /// </summary>
+    public class VirtualDeviceSession
+    {
+        /// <summary>
+        /// The <see cref="VirtualDevice"/> associated to this session.
+        /// </summary>
+        public VirtualDevice Device { get; }
+
+        /// <summary>
+        /// The user volume of this session.
+        /// </summary>
+        public float Volume { get; set; }
+
+        /// <summary>
+        /// Create a new <see cref="VirtualDeviceSession"/> instance.
+        /// </summary>
+        /// <param name="virtualDevice">The <see cref="VirtualDevice"/> associated to this session.</param>
+        public VirtualDeviceSession(VirtualDevice virtualDevice)
+        {
+            Device = virtualDevice;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Device/VirtualDeviceSessionRegistry.cs

@@ -0,0 +1,79 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System.Collections.Generic;
+
+namespace Ryujinx.Audio.Renderer.Device
+{
+    /// <summary>
+    /// Represent an instance containing a registry of <see cref="VirtualDeviceSession"/>.
+    /// </summary>
+    public class VirtualDeviceSessionRegistry
+    {
+        /// <summary>
+        /// The session registry, used to store the sessions of a given AppletResourceId.
+        /// </summary>
+        private Dictionary<ulong, VirtualDeviceSession[]> _sessionsRegistry = new Dictionary<ulong, VirtualDeviceSession[]>();
+
+        /// <summary>
+        /// The default <see cref="VirtualDevice"/>.
+        /// </summary>
+        /// <remarks>This is used when the USB device is the default one on older revision.</remarks>
+        public VirtualDevice DefaultDevice => VirtualDevice.Devices[0];
+
+        /// <summary>
+        /// The current active <see cref="VirtualDevice"/>.
+        /// </summary>
+        // TODO: make this configurable
+        public VirtualDevice ActiveDevice = VirtualDevice.Devices[1];
+
+        /// <summary>
+        /// Get the associated <see cref="T:VirtualDeviceSession[]"/> from an AppletResourceId.
+        /// </summary>
+        /// <param name="resourceAppletId">The AppletResourceId used.</param>
+        /// <returns>The associated <see cref="T:VirtualDeviceSession[]"/> from an AppletResourceId.</returns>
+        public VirtualDeviceSession[] GetSessionByAppletResourceId(ulong resourceAppletId)
+        {
+            if (_sessionsRegistry.TryGetValue(resourceAppletId, out VirtualDeviceSession[] result))
+            {
+                return result;
+            }
+
+            result = CreateSessionsFromBehaviourContext();
+
+            _sessionsRegistry.Add(resourceAppletId, result);
+
+            return result;
+        }
+
+        /// <summary>
+        /// Create a new array of sessions for each <see cref="VirtualDevice"/>.
+        /// </summary>
+        /// <returns>A new array of sessions for each <see cref="VirtualDevice"/>.</returns>
+        private static VirtualDeviceSession[] CreateSessionsFromBehaviourContext()
+        {
+            VirtualDeviceSession[] virtualDeviceSession = new VirtualDeviceSession[VirtualDevice.Devices.Length];
+
+            for (int i = 0; i < virtualDeviceSession.Length; i++)
+            {
+                virtualDeviceSession[i] = new VirtualDeviceSession(VirtualDevice.Devices[i]);
+            }
+
+            return virtualDeviceSession;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/AdpcmHelper.cs

@@ -0,0 +1,219 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Dsp.State;
+using System;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp
+{
+    public static class AdpcmHelper
+    {
+        private const int FixedPointPrecision = 11;
+        private const int SamplesPerFrame = 14;
+        private const int NibblesPerFrame = SamplesPerFrame + 2;
+        private const int BytesPerFrame = 8;
+        private const int BitsPerFrame = BytesPerFrame * 8;
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static uint GetAdpcmDataSize(int sampleCount)
+        {
+            Debug.Assert(sampleCount >= 0);
+
+            int frames = sampleCount / SamplesPerFrame;
+            int extraSize = 0;
+
+            if ((sampleCount % SamplesPerFrame) != 0)
+            {
+                extraSize = (sampleCount % SamplesPerFrame) / 2 + 1 + (sampleCount % 2);
+            }
+
+            return (uint)(BytesPerFrame * frames + extraSize);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static int GetAdpcmOffsetFromSampleOffset(int sampleOffset)
+        {
+            Debug.Assert(sampleOffset >= 0);
+
+            return GetNibblesFromSampleCount(sampleOffset) / 2;
+        }
+
+        public static int NibbleToSample(int nibble)
+        {
+            int frames = nibble / NibblesPerFrame;
+            int extraNibbles = nibble % NibblesPerFrame;
+            int samples = SamplesPerFrame * frames;
+
+            return samples + extraNibbles - 2;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static int GetNibblesFromSampleCount(int sampleCount)
+        {
+            byte headerSize = 0;
+
+            if ((sampleCount % SamplesPerFrame) != 0)
+            {
+                headerSize = 2;
+            }
+
+            return sampleCount % SamplesPerFrame + NibblesPerFrame * (sampleCount / SamplesPerFrame) + headerSize;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static short Saturate(int value)
+        {
+            if (value > short.MaxValue)
+                value = short.MaxValue;
+
+            if (value < short.MinValue)
+                value = short.MinValue;
+
+            return (short)value;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static int Decode(Span<short> output, ReadOnlySpan<byte> input, int startSampleOffset, int endSampleOffset, int offset, int count, ReadOnlySpan<short> coefficients, ref AdpcmLoopContext loopContext)
+        {
+            if (input.IsEmpty || endSampleOffset < startSampleOffset)
+            {
+                return 0;
+            }
+
+            byte predScale = (byte)loopContext.PredScale;
+            byte scale = (byte)(predScale & 0xF);
+            byte coefficientIndex = (byte)((predScale >> 4) & 0xF);
+            short history0 = loopContext.History0;
+            short history1 = loopContext.History1;
+            short coefficient0 = coefficients[coefficientIndex * 2 + 0];
+            short coefficient1 = coefficients[coefficientIndex * 2 + 1];
+
+            int decodedCount = Math.Min(count, endSampleOffset - startSampleOffset - offset);
+            int nibbles = GetNibblesFromSampleCount(offset + startSampleOffset);
+            int remaining = decodedCount;
+            int outputBufferIndex = 0;
+            int inputIndex = 0;
+
+            ReadOnlySpan<byte> targetInput;
+
+            targetInput = input.Slice(nibbles / 2);
+
+            while (remaining > 0)
+            {
+                int samplesCount;
+
+                if (((uint)nibbles % NibblesPerFrame) == 0)
+                {
+                    predScale = targetInput[inputIndex++];
+
+                    scale = (byte)(predScale & 0xF);
+
+                    coefficientIndex = (byte)((predScale >> 4) & 0xF);
+
+                    coefficient0 = coefficients[coefficientIndex * 2 + 0];
+                    coefficient1 = coefficients[coefficientIndex * 2 + 1];
+
+                    nibbles += 2;
+
+                    samplesCount = Math.Min(remaining, SamplesPerFrame);
+                }
+                else
+                {
+                    samplesCount = 1;
+                }
+
+                int scaleFixedPoint = FixedPointHelper.ToFixed(1.0f, FixedPointPrecision) << scale;
+
+                if (samplesCount < SamplesPerFrame)
+                {
+                    for (int i = 0; i < samplesCount; i++)
+                    {
+                        int value = targetInput[inputIndex];
+
+                        int sample;
+
+                        if ((nibbles & 1) != 0)
+                        {
+                            sample = (value << 28) >> 28;
+
+                            inputIndex++;
+                        }
+                        else
+                        {
+                            sample = (value << 24) >> 28;
+                        }
+
+                        nibbles++;
+
+                        int prediction = coefficient0 * history0 + coefficient1 * history1;
+
+                        sample = FixedPointHelper.RoundUpAndToInt(sample * scaleFixedPoint + prediction, FixedPointPrecision);
+
+                        short saturatedSample = Saturate(sample);
+
+                        history1 = history0;
+                        history0 = saturatedSample;
+
+                        output[outputBufferIndex++] = saturatedSample;
+
+                        remaining--;
+                    }
+                }
+                else
+                {
+                    for (int i = 0; i < SamplesPerFrame / 2; i++)
+                    {
+                        int value = targetInput[inputIndex];
+
+                        int sample0;
+                        int sample1;
+
+                        sample0 = (value << 24) >> 28;
+                        sample1 = (value << 28) >> 28;
+
+                        inputIndex++;
+
+                        int prediction0 = coefficient0 * history0 + coefficient1 * history1;
+                        sample0 = FixedPointHelper.RoundUpAndToInt(sample0 * scaleFixedPoint + prediction0, FixedPointPrecision);
+                        short saturatedSample0 = Saturate(sample0);
+
+                        int prediction1 = coefficient0 * saturatedSample0 + coefficient1 * history0;
+                        sample1 = FixedPointHelper.RoundUpAndToInt(sample1 * scaleFixedPoint + prediction1, FixedPointPrecision);
+                        short saturatedSample1 = Saturate(sample1);
+
+                        history1 = saturatedSample0;
+                        history0 = saturatedSample1;
+
+                        output[outputBufferIndex++] = saturatedSample0;
+                        output[outputBufferIndex++] = saturatedSample1;
+                    }
+
+                    nibbles += SamplesPerFrame;
+                    remaining -= SamplesPerFrame;
+                }
+            }
+
+            loopContext.PredScale = predScale;
+            loopContext.History0 = history0;
+            loopContext.History1 = history1;
+
+            return decodedCount;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/AudioProcessor.cs

@@ -0,0 +1,255 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Integration;
+using Ryujinx.Audio.Renderer.Dsp.Command;
+using Ryujinx.Audio.Renderer.Utils;
+using Ryujinx.Common;
+using Ryujinx.Common.Logging;
+using System;
+using System.Threading;
+
+namespace Ryujinx.Audio.Renderer.Dsp
+{
+    public class AudioProcessor : IDisposable
+    {
+        private const int MaxBufferedFrames = 5;
+        private const int TargetBufferedFrames = 3;
+
+        private enum MailboxMessage : uint
+        {
+            Start,
+            Stop,
+            RenderStart,
+            RenderEnd
+        }
+
+        private class RendererSession
+        {
+            public CommandList CommandList;
+            public int RenderingLimit;
+            public ulong AppletResourceId;
+        }
+
+        private Mailbox<MailboxMessage> _mailbox;
+        private RendererSession[] _sessionCommandList;
+        private Thread _workerThread;
+
+        public IHardwareDevice[] OutputDevices { get; private set; }
+
+        private long _lastTime;
+        private long _playbackEnds;
+        private ManualResetEvent _event;
+
+        public AudioProcessor()
+        {
+            _event = new ManualResetEvent(false);
+        }
+
+        private static uint GetHardwareChannelCount(IHardwareDeviceDriver deviceDriver)
+        {
+            // Get the real device driver (In case the compat layer is on top of it).
+            deviceDriver = deviceDriver.GetRealDeviceDriver();
+
+            if (deviceDriver.SupportsChannelCount(6))
+            {
+                return 6;
+            }
+            else
+            {
+                // NOTE: We default to stereo as this will get downmixed to mono by the compat layer if it's not compatible.
+                return 2;
+            }
+        }
+
+        public void Start(IHardwareDeviceDriver deviceDriver)
+        {
+            OutputDevices = new IHardwareDevice[Constants.AudioRendererSessionCountMax];
+
+            // TODO: Before enabling this, we need up-mixing from stereo to 5.1.
+            // uint channelCount = GetHardwareChannelCount(deviceDriver);
+            uint channelCount = 2;
+
+            for (int i = 0; i < OutputDevices.Length; i++)
+            {
+                // TODO: Don't hardcode sample rate.
+                OutputDevices[i] = new HardwareDeviceImpl(deviceDriver, channelCount, Constants.TargetSampleRate);
+            }
+
+            _mailbox = new Mailbox<MailboxMessage>();
+            _sessionCommandList = new RendererSession[Constants.AudioRendererSessionCountMax];
+            _event.Reset();
+            _lastTime = PerformanceCounter.ElapsedNanoseconds;
+
+            StartThread();
+
+            _mailbox.SendMessage(MailboxMessage.Start);
+
+            if (_mailbox.ReceiveResponse() != MailboxMessage.Start)
+            {
+                throw new InvalidOperationException("Audio Processor Start response was invalid!");
+            }
+        }
+
+        public void Stop()
+        {
+            _mailbox.SendMessage(MailboxMessage.Stop);
+
+            if (_mailbox.ReceiveResponse() != MailboxMessage.Stop)
+            {
+                throw new InvalidOperationException("Audio Processor Stop response was invalid!");
+            }
+
+            foreach (IHardwareDevice device in OutputDevices)
+            {
+                device.Dispose();
+            }
+        }
+
+        public void Send(int sessionId, CommandList commands, int renderingLimit, ulong appletResourceId)
+        {
+            _sessionCommandList[sessionId] = new RendererSession
+            {
+                CommandList = commands,
+                RenderingLimit = renderingLimit,
+                AppletResourceId = appletResourceId
+            };
+        }
+
+        public void Signal()
+        {
+            _mailbox.SendMessage(MailboxMessage.RenderStart);
+        }
+
+        public void Wait()
+        {
+            if (_mailbox.ReceiveResponse() != MailboxMessage.RenderEnd)
+            {
+                throw new InvalidOperationException("Audio Processor Wait response was invalid!");
+            }
+
+            long increment = Constants.AudioProcessorMaxUpdateTimeTarget;
+
+            long timeNow = PerformanceCounter.ElapsedNanoseconds;
+
+            if (timeNow > _playbackEnds)
+            {
+                // Playback has restarted.
+                _playbackEnds = timeNow;
+            }
+
+            _playbackEnds += increment;
+
+            // The number of frames we are behind where the timer says we should be.
+            long framesBehind = (timeNow - _lastTime) / increment;
+
+            // The number of frames yet to play on the backend.
+            long bufferedFrames = (_playbackEnds - timeNow) / increment + framesBehind;
+
+            // If we've entered a situation where a lot of buffers will be queued on the backend,
+            // Skip some audio frames so that playback can catch up.
+            if (bufferedFrames > MaxBufferedFrames)
+            {
+                // Skip a few frames so that we're not too far behind. (the target number of frames)
+                _lastTime += increment * (bufferedFrames - TargetBufferedFrames);
+            }
+
+            while (timeNow < _lastTime + increment)
+            {
+                _event.WaitOne(1);
+
+                timeNow = PerformanceCounter.ElapsedNanoseconds;
+            }
+
+            _lastTime += increment;
+        }
+
+        private void StartThread()
+        {
+            _workerThread = new Thread(Work)
+            {
+                Name = "AudioProcessor.Worker"
+            };
+
+            _workerThread.Start();
+        }
+
+        private void Work()
+        {
+            if (_mailbox.ReceiveMessage() != MailboxMessage.Start)
+            {
+                throw new InvalidOperationException("Audio Processor Start message was invalid!");
+            }
+
+            _mailbox.SendResponse(MailboxMessage.Start);
+            _mailbox.SendResponse(MailboxMessage.RenderEnd);
+
+            Logger.Info?.Print(LogClass.AudioRenderer, "Starting audio processor");
+
+            while (true)
+            {
+                MailboxMessage message = _mailbox.ReceiveMessage();
+
+                if (message == MailboxMessage.Stop)
+                {
+                    break;
+                }
+
+                if (message == MailboxMessage.RenderStart)
+                {
+                    long startTicks = PerformanceCounter.ElapsedNanoseconds;
+
+                    for (int i = 0; i < _sessionCommandList.Length; i++)
+                    {
+                        if (_sessionCommandList[i] != null)
+                        {
+                            _sessionCommandList[i].CommandList.Process(OutputDevices[i]);
+                            _sessionCommandList[i] = null;
+                        }
+                    }
+
+                    long endTicks = PerformanceCounter.ElapsedNanoseconds;
+
+                    long elapsedTime = endTicks - startTicks;
+
+                    if (Constants.AudioProcessorMaxUpdateTime < elapsedTime)
+                    {
+                        Logger.Debug?.Print(LogClass.AudioRenderer, $"DSP too slow (exceeded by {elapsedTime - Constants.AudioProcessorMaxUpdateTime}ns)");
+                    }
+
+                    _mailbox.SendResponse(MailboxMessage.RenderEnd);
+                }
+            }
+
+            Logger.Info?.Print(LogClass.AudioRenderer, "Stopping audio processor");
+            _mailbox.SendResponse(MailboxMessage.Stop);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _event.Dispose();
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/AdpcmDataSourceCommandVersion1.cs

@@ -0,0 +1,94 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Renderer.Common;
+using System;
+using static Ryujinx.Audio.Renderer.Parameter.VoiceInParameter;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class AdpcmDataSourceCommandVersion1 : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.AdpcmDataSourceVersion1;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort OutputBufferIndex { get; }
+        public uint SampleRate { get; }
+
+        public float Pitch { get; }
+
+        public WaveBuffer[] WaveBuffers { get; }
+
+        public Memory<VoiceUpdateState> State { get; }
+
+        public ulong AdpcmParameter { get; }
+        public ulong AdpcmParameterSize { get; }
+
+        public DecodingBehaviour DecodingBehaviour { get; }
+
+        public AdpcmDataSourceCommandVersion1(ref Server.Voice.VoiceState serverState, Memory<VoiceUpdateState> state, ushort outputBufferIndex, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            OutputBufferIndex = outputBufferIndex;
+            SampleRate = serverState.SampleRate;
+            Pitch = serverState.Pitch;
+
+            WaveBuffers = new WaveBuffer[Constants.VoiceWaveBufferCount];
+
+            for (int i = 0; i < WaveBuffers.Length; i++)
+            {
+                ref Server.Voice.WaveBuffer voiceWaveBuffer = ref serverState.WaveBuffers[i];
+
+                WaveBuffers[i] = voiceWaveBuffer.ToCommon(1);
+            }
+
+            AdpcmParameter = serverState.DataSourceStateAddressInfo.GetReference(true);
+            AdpcmParameterSize = serverState.DataSourceStateAddressInfo.Size;
+            State = state;
+            DecodingBehaviour = serverState.DecodingBehaviour;
+        }
+
+        public void Process(CommandList context)
+        {
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            DataSourceHelper.WaveBufferInformation info = new DataSourceHelper.WaveBufferInformation()
+            {
+                State = State,
+                SourceSampleRate = SampleRate,
+                SampleFormat = SampleFormat.Adpcm,
+                Pitch = Pitch,
+                DecodingBehaviour = DecodingBehaviour,
+                WaveBuffers = WaveBuffers,
+                ExtraParameter = AdpcmParameter,
+                ExtraParameterSize = AdpcmParameterSize,
+                ChannelIndex = 0,
+                ChannelCount = 1,
+            };
+
+            DataSourceHelper.ProcessWaveBuffers(context.MemoryManager, outputBuffer, info, context.SampleRate, (int)context.SampleCount);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/AuxiliaryBufferCommand.cs

@@ -0,0 +1,205 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Common;
+using Ryujinx.Memory;
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using static Ryujinx.Audio.Renderer.Dsp.State.AuxiliaryBufferHeader;
+using CpuAddress = System.UInt64;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class AuxiliaryBufferCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.AuxiliaryBuffer;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public uint InputBufferIndex { get; }
+        public uint OutputBufferIndex { get; }
+
+        public AuxiliaryBufferAddresses BufferInfo { get; }
+
+        public CpuAddress InputBuffer { get; }
+        public CpuAddress OutputBuffer { get; }
+        public uint CountMax { get; }
+        public uint UpdateCount { get; }
+        public uint WriteOffset { get; }
+
+        public bool IsEffectEnabled { get; }
+
+        public AuxiliaryBufferCommand(uint bufferOffset, byte inputBufferOffset, byte outputBufferOffset,
+                          ref AuxiliaryBufferAddresses sendBufferInfo, bool isEnabled, uint countMax,
+                          CpuAddress outputBuffer, CpuAddress inputBuffer, uint updateCount, uint writeOffset, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+            InputBufferIndex = bufferOffset + inputBufferOffset;
+            OutputBufferIndex = bufferOffset + outputBufferOffset;
+            BufferInfo = sendBufferInfo;
+            InputBuffer = inputBuffer;
+            OutputBuffer = outputBuffer;
+            CountMax = countMax;
+            UpdateCount = updateCount;
+            WriteOffset = writeOffset;
+            IsEffectEnabled = isEnabled;
+        }
+
+        private uint Read(IVirtualMemoryManager memoryManager, ulong bufferAddress, uint countMax, Span<int> outBuffer, uint count, uint readOffset, uint updateCount)
+        {
+            if (countMax == 0 || bufferAddress == 0)
+            {
+                return 0;
+            }
+
+            uint targetReadOffset = readOffset + AuxiliaryBufferInfo.GetReadOffset(memoryManager, BufferInfo.ReturnBufferInfo);
+
+            if (targetReadOffset > countMax)
+            {
+                return 0;
+            }
+
+            uint remaining = count;
+
+            uint outBufferOffset = 0;
+
+            while (remaining != 0)
+            {
+                uint countToWrite = Math.Min(countMax - targetReadOffset, remaining);
+
+                memoryManager.Read(bufferAddress + targetReadOffset * sizeof(int), MemoryMarshal.Cast<int, byte>(outBuffer.Slice((int)outBufferOffset, (int)countToWrite)));
+
+                targetReadOffset = (targetReadOffset + countToWrite) % countMax;
+                remaining -= countToWrite;
+                outBufferOffset += countToWrite;
+            }
+
+            if (updateCount != 0)
+            {
+                uint newReadOffset = (AuxiliaryBufferInfo.GetReadOffset(memoryManager, BufferInfo.ReturnBufferInfo) + updateCount) % countMax;
+
+                AuxiliaryBufferInfo.SetReadOffset(memoryManager, BufferInfo.ReturnBufferInfo, newReadOffset);
+            }
+
+            return count;
+        }
+
+        private uint Write(IVirtualMemoryManager memoryManager, ulong outBufferAddress, uint countMax, ReadOnlySpan<int> buffer, uint count, uint writeOffset, uint updateCount)
+        {
+            if (countMax == 0 || outBufferAddress == 0)
+            {
+                return 0;
+            }
+
+            uint targetWriteOffset = writeOffset + AuxiliaryBufferInfo.GetWriteOffset(memoryManager, BufferInfo.SendBufferInfo);
+
+            if (targetWriteOffset > countMax)
+            {
+                return 0;
+            }
+
+            uint remaining = count;
+
+            uint inBufferOffset = 0;
+
+            while (remaining != 0)
+            {
+                uint countToWrite = Math.Min(countMax - targetWriteOffset, remaining);
+
+                memoryManager.Write(outBufferAddress + targetWriteOffset * sizeof(int), MemoryMarshal.Cast<int, byte>(buffer.Slice((int)inBufferOffset, (int)countToWrite)));
+
+                targetWriteOffset = (targetWriteOffset + countToWrite) % countMax;
+                remaining -= countToWrite;
+                inBufferOffset += countToWrite;
+            }
+
+            if (updateCount != 0)
+            {
+                uint newWriteOffset = (AuxiliaryBufferInfo.GetWriteOffset(memoryManager, BufferInfo.SendBufferInfo) + updateCount) % countMax;
+
+                AuxiliaryBufferInfo.SetWriteOffset(memoryManager, BufferInfo.SendBufferInfo, newWriteOffset);
+            }
+
+            return count;
+        }
+
+        public void Process(CommandList context)
+        {
+            Span<float> inputBuffer = context.GetBuffer((int)InputBufferIndex);
+            Span<float> outputBuffer = context.GetBuffer((int)OutputBufferIndex);
+
+            if (IsEffectEnabled)
+            {
+                Span<int> inputBufferInt = MemoryMarshal.Cast<float, int>(inputBuffer);
+                Span<int> outputBufferInt = MemoryMarshal.Cast<float, int>(outputBuffer);
+
+                // Convert input data to the target format for user (int)
+                DataSourceHelper.ToInt(inputBufferInt, inputBuffer, outputBuffer.Length);
+
+                // Send the input to the user
+                Write(context.MemoryManager, OutputBuffer, CountMax, inputBufferInt, context.SampleCount, WriteOffset, UpdateCount);
+
+                // Convert back to float just in case it's reused
+                DataSourceHelper.ToFloat(inputBuffer, inputBufferInt, inputBuffer.Length);
+
+                // Retrieve the input from user
+                uint readResult = Read(context.MemoryManager, InputBuffer, CountMax, outputBufferInt, context.SampleCount, WriteOffset, UpdateCount);
+
+                // Convert the outputBuffer back to the target format of the renderer (float)
+                DataSourceHelper.ToFloat(outputBuffer, outputBufferInt, outputBuffer.Length);
+
+                if (readResult != context.SampleCount)
+                {
+                    outputBuffer.Slice((int)readResult, (int)context.SampleCount - (int)readResult).Fill(0);
+                }
+            }
+            else
+            {
+                ZeroFill(context.MemoryManager, BufferInfo.SendBufferInfo, Unsafe.SizeOf<AuxiliaryBufferInfo>());
+                ZeroFill(context.MemoryManager, BufferInfo.ReturnBufferInfo, Unsafe.SizeOf<AuxiliaryBufferInfo>());
+
+                if (InputBufferIndex != OutputBufferIndex)
+                {
+                    inputBuffer.CopyTo(outputBuffer);
+                }
+            }
+        }
+
+        private static void ZeroFill(IVirtualMemoryManager memoryManager, ulong address, int size)
+        {
+            ulong endAddress = address + (ulong)size;
+
+            while (address + 7UL < endAddress)
+            {
+                memoryManager.Write(address, 0UL);
+                address += 8;
+            }
+
+            while (address < endAddress)
+            {
+                memoryManager.Write(address, (byte)0);
+                address++;
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/BiquadFilterCommand.cs

@@ -0,0 +1,89 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Dsp.State;
+using Ryujinx.Audio.Renderer.Parameter;
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class BiquadFilterCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.BiquadFilter;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public BiquadFilterParameter Parameter { get; }
+        public Memory<BiquadFilterState> BiquadFilterState { get; }
+        public int InputBufferIndex { get; }
+        public int OutputBufferIndex { get; }
+        public bool NeedInitialization { get; }
+
+        public BiquadFilterCommand(int baseIndex, ref BiquadFilterParameter filter, Memory<BiquadFilterState> biquadFilterStateMemory, int inputBufferOffset, int outputBufferOffset, bool needInitialization, int nodeId)
+        {
+            Parameter = filter;
+            BiquadFilterState = biquadFilterStateMemory;
+            InputBufferIndex = baseIndex + inputBufferOffset;
+            OutputBufferIndex = baseIndex + outputBufferOffset;
+            NeedInitialization = needInitialization;
+
+            Enabled = true;
+            NodeId = nodeId;
+        }
+
+        private void ProcessBiquadFilter(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, uint sampleCount)
+        {
+            const int fixedPointPrecisionForParameter = 14;
+
+            float a0 = FixedPointHelper.ToFloat(Parameter.Numerator[0], fixedPointPrecisionForParameter);
+            float a1 = FixedPointHelper.ToFloat(Parameter.Numerator[1], fixedPointPrecisionForParameter);
+            float a2 = FixedPointHelper.ToFloat(Parameter.Numerator[2], fixedPointPrecisionForParameter);
+
+            float b1 = FixedPointHelper.ToFloat(Parameter.Denominator[0], fixedPointPrecisionForParameter);
+            float b2 = FixedPointHelper.ToFloat(Parameter.Denominator[1], fixedPointPrecisionForParameter);
+
+            ref BiquadFilterState state = ref BiquadFilterState.Span[0];
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                float input = inputBuffer[i];
+                float output = input * a0 + state.Z1;
+
+                state.Z1 = input * a1 + output * b1 + state.Z2;
+                state.Z2 = input * a2 + output * b2;
+
+                outputBuffer[i] = output;
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            Span<float> outputBuffer = context.GetBuffer(InputBufferIndex);
+
+            if (NeedInitialization)
+            {
+                BiquadFilterState.Span[0] = new BiquadFilterState();
+            }
+
+            ProcessBiquadFilter(outputBuffer, outputBuffer, context.SampleCount);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/CircularBufferSinkCommand.cs

@@ -0,0 +1,91 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Parameter.Sink;
+using Ryujinx.Audio.Renderer.Server.MemoryPool;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class CircularBufferSinkCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.CircularBufferSink;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort[] Input { get; }
+        public uint InputCount { get; }
+
+        public ulong CircularBuffer { get; }
+        public ulong CircularBufferSize { get; }
+        public ulong CurrentOffset { get; }
+
+        public CircularBufferSinkCommand(uint bufferOffset, ref CircularBufferParameter parameter, ref AddressInfo circularBufferAddressInfo, uint currentOffset, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            Input = new ushort[Constants.ChannelCountMax];
+            InputCount = parameter.InputCount;
+
+            for (int i = 0; i < InputCount; i++)
+            {
+                Input[i] = (ushort)(bufferOffset + parameter.Input[i]);
+            }
+
+            CircularBuffer = circularBufferAddressInfo.GetReference(true);
+            CircularBufferSize = parameter.BufferSize;
+            CurrentOffset = currentOffset;
+
+            Debug.Assert(CircularBuffer != 0);
+        }
+
+        public void Process(CommandList context)
+        {
+            const int targetChannelCount = 2;
+
+            ulong currentOffset = CurrentOffset;
+
+            if (CircularBufferSize > 0)
+            {
+                for (int i = 0; i < InputCount; i++)
+                {
+                    ReadOnlySpan<float> inputBuffer = context.GetBuffer(Input[i]);
+
+                    ulong targetOffset = CircularBuffer + currentOffset;
+
+                    for (int y = 0; y < context.SampleCount; y++)
+                    {
+                        context.MemoryManager.Write(targetOffset + (ulong)y * targetChannelCount, PcmHelper.Saturate(inputBuffer[y]));
+                    }
+
+                    currentOffset += context.SampleCount * targetChannelCount;
+
+                    if (currentOffset >= CircularBufferSize)
+                    {
+                        currentOffset = 0;
+                    }
+                }
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/ClearMixBufferCommand.cs

@@ -0,0 +1,41 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class ClearMixBufferCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.ClearMixBuffer;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ClearMixBufferCommand(int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+        }
+
+        public void Process(CommandList context)
+        {
+            context.Buffers.Span.Fill(0);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/CommandList.cs

@@ -0,0 +1,124 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Integration;
+using Ryujinx.Audio.Renderer.Server;
+using Ryujinx.Common;
+using Ryujinx.Common.Logging;
+using Ryujinx.Memory;
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class CommandList
+    {
+        public ulong StartTime { get; private set; }
+        public ulong EndTime { get; private set; }
+        public uint SampleCount { get; }
+        public uint SampleRate { get; }
+
+        public Memory<float> Buffers { get; }
+        public uint BufferCount { get; }
+
+        public List<ICommand> Commands { get; }
+
+        public IVirtualMemoryManager MemoryManager { get; }
+
+        public IHardwareDevice OutputDevice { get; private set; }
+
+        public CommandList(AudioRenderSystem renderSystem) : this(renderSystem.MemoryManager,
+                                                                  renderSystem.GetMixBuffer(),
+                                                                  renderSystem.GetSampleCount(),
+                                                                  renderSystem.GetSampleRate(),
+                                                                  renderSystem.GetMixBufferCount(),
+                                                                  renderSystem.GetVoiceChannelCountMax())
+        {
+        }
+
+        public CommandList(IVirtualMemoryManager memoryManager, Memory<float> mixBuffer, uint sampleCount, uint sampleRate, uint mixBufferCount, uint voiceChannelCountMax)
+        {
+            SampleCount = sampleCount;
+            SampleRate = sampleRate;
+            BufferCount = mixBufferCount + voiceChannelCountMax;
+            Buffers = mixBuffer;
+            Commands = new List<ICommand>();
+            MemoryManager = memoryManager;
+        }
+
+        public void AddCommand(ICommand command)
+        {
+            Commands.Add(command);
+        }
+
+        public void AddCommand<T>(T command) where T : unmanaged, ICommand
+        {
+            throw new NotImplementedException();
+        }
+
+        public Memory<float> GetBufferMemory(int index)
+        {
+            return Buffers.Slice(index * (int)SampleCount, (int)SampleCount);
+        }
+
+        public Span<float> GetBuffer(int index)
+        {
+            return Buffers.Span.Slice(index * (int)SampleCount, (int)SampleCount);
+        }
+
+        public ulong GetTimeElapsedSinceDspStartedProcessing()
+        {
+            return (ulong)PerformanceCounter.ElapsedNanoseconds - StartTime;
+        }
+
+        public void Process(IHardwareDevice outputDevice)
+        {
+            OutputDevice = outputDevice;
+
+            StartTime = (ulong)PerformanceCounter.ElapsedNanoseconds;
+
+            foreach (ICommand command in Commands)
+            {
+                if (command.Enabled)
+                {
+                    bool shouldMeter = command.ShouldMeter();
+
+                    long startTime = 0;
+
+                    if (shouldMeter)
+                    {
+                        startTime = PerformanceCounter.ElapsedNanoseconds;
+                    }
+
+                    command.Process(this);
+
+                    if (shouldMeter)
+                    {
+                        ulong effectiveElapsedTime = (ulong)(PerformanceCounter.ElapsedNanoseconds - startTime);
+
+                        if (effectiveElapsedTime > command.EstimatedProcessingTime)
+                        {
+                            Logger.Warning?.Print(LogClass.AudioRenderer, $"Command {command.GetType().Name} took {effectiveElapsedTime}ns (expected {command.EstimatedProcessingTime}ns)");
+                        }
+                    }
+                }
+            }
+
+            EndTime = (ulong)PerformanceCounter.ElapsedNanoseconds;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/CommandType.cs

@@ -0,0 +1,49 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public enum CommandType : byte
+    {
+        Invalid,
+        PcmInt16DataSourceVersion1,
+        PcmInt16DataSourceVersion2,
+        PcmFloatDataSourceVersion1,
+        PcmFloatDataSourceVersion2,
+        AdpcmDataSourceVersion1,
+        AdpcmDataSourceVersion2,
+        Volume,
+        VolumeRamp,
+        BiquadFilter,
+        Mix,
+        MixRamp,
+        MixRampGrouped,
+        DepopPrepare,
+        DepopForMixBuffers,
+        Delay,
+        Upsample,
+        DownMixSurroundToStereo,
+        AuxiliaryBuffer,
+        DeviceSink,
+        CircularBufferSink,
+        Reverb,
+        Reverb3d,
+        Performance,
+        ClearMixBuffer,
+        CopyMixBuffer
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/CopyMixBufferCommand.cs

@@ -0,0 +1,52 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class CopyMixBufferCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.CopyMixBuffer;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort InputBufferIndex { get; }
+        public ushort OutputBufferIndex { get; }
+
+        public CopyMixBufferCommand(uint inputBufferIndex, uint outputBufferIndex, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            InputBufferIndex = (ushort)inputBufferIndex;
+            OutputBufferIndex = (ushort)outputBufferIndex;
+        }
+
+        public void Process(CommandList context)
+        {
+            ReadOnlySpan<float> inputBuffer = context.GetBuffer(InputBufferIndex);
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            inputBuffer.CopyTo(outputBuffer);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/DataSourceVersion2Command.cs

@@ -0,0 +1,127 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Renderer.Common;
+using System;
+using static Ryujinx.Audio.Renderer.Parameter.VoiceInParameter;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class DataSourceVersion2Command : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType { get; }
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort OutputBufferIndex { get; }
+        public uint SampleRate { get; }
+
+        public float Pitch { get; }
+
+        public WaveBuffer[] WaveBuffers { get; }
+
+        public Memory<VoiceUpdateState> State { get; }
+
+        public ulong ExtraParameter { get; }
+        public ulong ExtraParameterSize { get; }
+
+        public uint ChannelIndex { get; }
+
+        public uint ChannelCount { get; }
+
+        public DecodingBehaviour DecodingBehaviour { get; }
+
+        public SampleFormat SampleFormat { get; }
+
+        public SampleRateConversionQuality SrcQuality { get; }
+
+        public DataSourceVersion2Command(ref Server.Voice.VoiceState serverState, Memory<VoiceUpdateState> state, ushort outputBufferIndex, ushort channelIndex, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+            ChannelIndex = channelIndex;
+            ChannelCount = serverState.ChannelsCount;
+            SampleFormat = serverState.SampleFormat;
+            SrcQuality = serverState.SrcQuality;
+            CommandType = GetCommandTypeBySampleFormat(SampleFormat);
+
+            OutputBufferIndex = (ushort)(channelIndex + outputBufferIndex);
+            SampleRate = serverState.SampleRate;
+            Pitch = serverState.Pitch;
+
+            WaveBuffers = new WaveBuffer[Constants.VoiceWaveBufferCount];
+
+            for (int i = 0; i < WaveBuffers.Length; i++)
+            {
+                ref Server.Voice.WaveBuffer voiceWaveBuffer = ref serverState.WaveBuffers[i];
+
+                WaveBuffers[i] = voiceWaveBuffer.ToCommon(2);
+            }
+
+            if (SampleFormat == SampleFormat.Adpcm)
+            {
+                ExtraParameter = serverState.DataSourceStateAddressInfo.GetReference(true);
+                ExtraParameterSize = serverState.DataSourceStateAddressInfo.Size;
+            }
+
+            State = state;
+            DecodingBehaviour = serverState.DecodingBehaviour;
+        }
+
+        private static CommandType GetCommandTypeBySampleFormat(SampleFormat sampleFormat)
+        {
+            switch (sampleFormat)
+            {
+                case SampleFormat.Adpcm:
+                    return CommandType.AdpcmDataSourceVersion2;
+                case SampleFormat.PcmInt16:
+                    return CommandType.PcmInt16DataSourceVersion2;
+                case SampleFormat.PcmFloat:
+                    return CommandType.PcmFloatDataSourceVersion2;
+                default:
+                    throw new NotImplementedException($"{sampleFormat}");
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            DataSourceHelper.WaveBufferInformation info = new DataSourceHelper.WaveBufferInformation()
+            {
+                State = State,
+                SourceSampleRate = SampleRate,
+                SampleFormat = SampleFormat,
+                Pitch = Pitch,
+                DecodingBehaviour = DecodingBehaviour,
+                WaveBuffers = WaveBuffers,
+                ExtraParameter = ExtraParameter,
+                ExtraParameterSize = ExtraParameterSize,
+                ChannelIndex = (int)ChannelIndex,
+                ChannelCount = (int)ChannelCount,
+                SrcQuality = SrcQuality
+            };
+
+            DataSourceHelper.ProcessWaveBuffers(context.MemoryManager, outputBuffer, info, context.SampleRate, (int)context.SampleCount);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/DelayCommand.cs

@@ -0,0 +1,272 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Dsp.State;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using Ryujinx.Audio.Renderer.Server.Effect;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class DelayCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.Delay;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public DelayParameter Parameter => _parameter;
+        public Memory<DelayState> State { get; }
+        public ulong WorkBuffer { get; }
+        public ushort[] OutputBufferIndices { get; }
+        public ushort[] InputBufferIndices { get; }
+        public bool IsEffectEnabled { get; }
+
+        private DelayParameter _parameter;
+
+        private const int FixedPointPrecision = 14;
+
+        public DelayCommand(uint bufferOffset, DelayParameter parameter, Memory<DelayState> state, bool isEnabled, ulong workBuffer, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+            _parameter = parameter;
+            State = state;
+            WorkBuffer = workBuffer;
+
+            IsEffectEnabled = isEnabled;
+
+            InputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+            OutputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+
+            for (int i = 0; i < Parameter.ChannelCount; i++)
+            {
+                InputBufferIndices[i] = (ushort)(bufferOffset + Parameter.Input[i]);
+                OutputBufferIndices[i] = (ushort)(bufferOffset + Parameter.Output[i]);
+            }
+        }
+
+        private void ProcessDelayMono(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, uint sampleCount)
+        {
+            ref DelayState state = ref State.Span[0];
+
+            float feedbackGain = FixedPointHelper.ToFloat(Parameter.FeedbackGain, FixedPointPrecision);
+            float inGain = FixedPointHelper.ToFloat(Parameter.InGain, FixedPointPrecision);
+            float dryGain = FixedPointHelper.ToFloat(Parameter.DryGain, FixedPointPrecision);
+            float outGain = FixedPointHelper.ToFloat(Parameter.OutGain, FixedPointPrecision);
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                float input = inputBuffer[i] * 64;
+                float delayLineValue = state.DelayLines[0].Read();
+
+                float lowPassResult = input * inGain + delayLineValue * feedbackGain * state.LowPassBaseGain + state.LowPassZ[0] * state.LowPassFeedbackGain;
+
+                state.LowPassZ[0] = lowPassResult;
+
+                state.DelayLines[0].Update(lowPassResult);
+
+                outputBuffer[i] = (input * dryGain + delayLineValue * outGain) / 64;
+            }
+        }
+
+        private void ProcessDelayStereo(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ref DelayState state = ref State.Span[0];
+
+            float[] channelInput = new float[Parameter.ChannelCount];
+            float[] delayLineValues = new float[Parameter.ChannelCount];
+            float[] temp = new float[Parameter.ChannelCount];
+
+            float delayFeedbackBaseGain = state.DelayFeedbackBaseGain;
+            float delayFeedbackCrossGain = state.DelayFeedbackCrossGain;
+            float inGain = FixedPointHelper.ToFloat(Parameter.InGain, FixedPointPrecision);
+            float dryGain = FixedPointHelper.ToFloat(Parameter.DryGain, FixedPointPrecision);
+            float outGain = FixedPointHelper.ToFloat(Parameter.OutGain, FixedPointPrecision);
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                for (int j = 0; j < Parameter.ChannelCount; j++)
+                {
+                    channelInput[j] = inputBuffers[j].Span[i] * 64;
+                    delayLineValues[j] = state.DelayLines[j].Read();
+                }
+
+                temp[0] = channelInput[0] * inGain + delayLineValues[1] * delayFeedbackCrossGain + delayLineValues[0] * delayFeedbackBaseGain;
+                temp[1] = channelInput[1] * inGain + delayLineValues[0] * delayFeedbackCrossGain + delayLineValues[1] * delayFeedbackBaseGain;
+
+                for (int j = 0; j < Parameter.ChannelCount; j++)
+                {
+                    float lowPassResult = state.LowPassFeedbackGain * state.LowPassZ[j] + temp[j] * state.LowPassBaseGain;
+
+                    state.LowPassZ[j] = lowPassResult;
+                    state.DelayLines[j].Update(lowPassResult);
+
+                    outputBuffers[j].Span[i] = (channelInput[j] * dryGain + delayLineValues[j] * outGain) / 64;
+                }
+            }
+        }
+
+        private void ProcessDelayQuadraphonic(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ref DelayState state = ref State.Span[0];
+
+            float[] channelInput = new float[Parameter.ChannelCount];
+            float[] delayLineValues = new float[Parameter.ChannelCount];
+            float[] temp = new float[Parameter.ChannelCount];
+
+            float delayFeedbackBaseGain = state.DelayFeedbackBaseGain;
+            float delayFeedbackCrossGain = state.DelayFeedbackCrossGain;
+            float inGain = FixedPointHelper.ToFloat(Parameter.InGain, FixedPointPrecision);
+            float dryGain = FixedPointHelper.ToFloat(Parameter.DryGain, FixedPointPrecision);
+            float outGain = FixedPointHelper.ToFloat(Parameter.OutGain, FixedPointPrecision);
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                for (int j = 0; j < Parameter.ChannelCount; j++)
+                {
+                    channelInput[j] = inputBuffers[j].Span[i] * 64;
+                    delayLineValues[j] = state.DelayLines[j].Read();
+                }
+
+                temp[0] = channelInput[0] * inGain + (delayLineValues[2] + delayLineValues[1]) * delayFeedbackCrossGain + delayLineValues[0] * delayFeedbackBaseGain;
+                temp[1] = channelInput[1] * inGain + (delayLineValues[0] + delayLineValues[3]) * delayFeedbackCrossGain + delayLineValues[1] * delayFeedbackBaseGain;
+                temp[2] = channelInput[2] * inGain + (delayLineValues[3] + delayLineValues[0]) * delayFeedbackCrossGain + delayLineValues[2] * delayFeedbackBaseGain;
+                temp[3] = channelInput[3] * inGain + (delayLineValues[1] + delayLineValues[2]) * delayFeedbackCrossGain + delayLineValues[3] * delayFeedbackBaseGain;
+
+                for (int j = 0; j < Parameter.ChannelCount; j++)
+                {
+                    float lowPassResult = state.LowPassFeedbackGain * state.LowPassZ[j] + temp[j] * state.LowPassBaseGain;
+
+                    state.LowPassZ[j] = lowPassResult;
+                    state.DelayLines[j].Update(lowPassResult);
+
+                    outputBuffers[j].Span[i] = (channelInput[j] * dryGain + delayLineValues[j] * outGain) / 64;
+                }
+            }
+        }
+
+        private void ProcessDelaySurround(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ref DelayState state = ref State.Span[0];
+
+            float[] channelInput = new float[Parameter.ChannelCount];
+            float[] delayLineValues = new float[Parameter.ChannelCount];
+            float[] temp = new float[Parameter.ChannelCount];
+
+            float delayFeedbackBaseGain = state.DelayFeedbackBaseGain;
+            float delayFeedbackCrossGain = state.DelayFeedbackCrossGain;
+            float inGain = FixedPointHelper.ToFloat(Parameter.InGain, FixedPointPrecision);
+            float dryGain = FixedPointHelper.ToFloat(Parameter.DryGain, FixedPointPrecision);
+            float outGain = FixedPointHelper.ToFloat(Parameter.OutGain, FixedPointPrecision);
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                for (int j = 0; j < Parameter.ChannelCount; j++)
+                {
+                    channelInput[j] = inputBuffers[j].Span[i] * 64;
+                    delayLineValues[j] = state.DelayLines[j].Read();
+                }
+
+                temp[0] = channelInput[0] * inGain + (delayLineValues[2] + delayLineValues[4]) * delayFeedbackCrossGain + delayLineValues[0] * delayFeedbackBaseGain;
+                temp[1] = channelInput[1] * inGain + (delayLineValues[4] + delayLineValues[3]) * delayFeedbackCrossGain + delayLineValues[1] * delayFeedbackBaseGain;
+                temp[2] = channelInput[2] * inGain + (delayLineValues[3] + delayLineValues[0]) * delayFeedbackCrossGain + delayLineValues[2] * delayFeedbackBaseGain;
+                temp[3] = channelInput[3] * inGain + (delayLineValues[1] + delayLineValues[2]) * delayFeedbackCrossGain + delayLineValues[3] * delayFeedbackBaseGain;
+                temp[4] = channelInput[4] * inGain + (delayLineValues[0] + delayLineValues[1]) * delayFeedbackCrossGain + delayLineValues[4] * delayFeedbackBaseGain;
+                temp[5] = channelInput[5] * inGain + delayLineValues[5] * delayFeedbackBaseGain;
+
+                for (int j = 0; j < Parameter.ChannelCount; j++)
+                {
+                    float lowPassResult = state.LowPassFeedbackGain * state.LowPassZ[j] + temp[j] * state.LowPassBaseGain;
+
+                    state.LowPassZ[j] = lowPassResult;
+                    state.DelayLines[j].Update(lowPassResult);
+
+                    outputBuffers[j].Span[i] = (channelInput[j] * dryGain + delayLineValues[j] * outGain) / 64;
+                }
+            }
+        }
+
+        private void ProcessDelay(CommandList context)
+        {
+            Debug.Assert(Parameter.IsChannelCountValid());
+
+            if (IsEffectEnabled && Parameter.IsChannelCountValid())
+            {
+                ReadOnlyMemory<float>[] inputBuffers = new ReadOnlyMemory<float>[Parameter.ChannelCount];
+                Memory<float>[] outputBuffers = new Memory<float>[Parameter.ChannelCount];
+
+                for (int i = 0; i < Parameter.ChannelCount; i++)
+                {
+                    inputBuffers[i] = context.GetBufferMemory(InputBufferIndices[i]);
+                    outputBuffers[i] = context.GetBufferMemory(OutputBufferIndices[i]);
+                }
+
+                switch (Parameter.ChannelCount)
+                {
+                    case 1:
+                        ProcessDelayMono(outputBuffers[0].Span, inputBuffers[0].Span, context.SampleCount);
+                        break;
+                    case 2:
+                        ProcessDelayStereo(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 4:
+                        ProcessDelayQuadraphonic(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 6:
+                        ProcessDelaySurround(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    default:
+                        throw new NotImplementedException($"{Parameter.ChannelCount}");
+                }
+            }
+            else
+            {
+                for (int i = 0; i < Parameter.ChannelCount; i++)
+                {
+                    if (InputBufferIndices[i] != OutputBufferIndices[i])
+                    {
+                        context.GetBufferMemory(InputBufferIndices[i]).CopyTo(context.GetBufferMemory(OutputBufferIndices[i]));
+                    }
+                }
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            ref DelayState state = ref State.Span[0];
+
+            if (IsEffectEnabled)
+            {
+                if (Parameter.Status == UsageState.Invalid)
+                {
+                    state = new DelayState(ref _parameter, WorkBuffer);
+                }
+                else if (Parameter.Status == UsageState.New)
+                {
+                    state.UpdateParameter(ref _parameter);
+                }
+            }
+
+            ProcessDelay(context);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/DepopForMixBuffersCommand.cs

@@ -0,0 +1,103 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class DepopForMixBuffersCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.DepopForMixBuffers;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public uint MixBufferOffset { get; }
+
+        public uint MixBufferCount { get; }
+
+        public float Decay { get; }
+
+        public Memory<float> DepopBuffer { get; }
+
+        private const int FixedPointPrecisionForDecay = 15;
+
+        public DepopForMixBuffersCommand(Memory<float> depopBuffer, uint bufferOffset, uint mixBufferCount, int nodeId, uint sampleRate)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+            MixBufferOffset = bufferOffset;
+            MixBufferCount = mixBufferCount;
+            DepopBuffer = depopBuffer;
+
+            if (sampleRate == 48000)
+            {
+                Decay = 0.962189f;
+            }
+            else // if (sampleRate == 32000)
+            {
+                Decay = 0.943695f;
+            }
+        }
+
+        private float ProcessDepopMix(Span<float> buffer, float depopValue, uint sampleCount)
+        {
+            if (depopValue <= 0)
+            {
+                for (int i = 0; i < sampleCount; i++)
+                {
+                    depopValue = FloatingPointHelper.MultiplyRoundDown(Decay, depopValue);
+
+                    buffer[i] -= depopValue;
+                }
+
+                return -depopValue;
+            }
+            else
+            {
+                for (int i = 0; i < sampleCount; i++)
+                {
+                    depopValue = FloatingPointHelper.MultiplyRoundDown(Decay, depopValue);
+
+                    buffer[i] += depopValue;
+                }
+
+                return depopValue;
+            }
+
+        }
+
+        public void Process(CommandList context)
+        {
+            uint bufferCount = Math.Min(MixBufferOffset + MixBufferCount, context.BufferCount);
+
+            for (int i = (int)MixBufferOffset; i < bufferCount; i++)
+            {
+                float depopValue = DepopBuffer.Span[i];
+                if (depopValue != 0)
+                {
+                    Span<float> buffer = context.GetBuffer(i);
+
+                    DepopBuffer.Span[i] = ProcessDepopMix(buffer, depopValue, context.SampleCount);
+                }
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/DepopPrepareCommand.cs

@@ -0,0 +1,72 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Common;
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class DepopPrepareCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.DepopPrepare;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public uint MixBufferCount { get; }
+
+        public ushort[] OutputBufferIndices { get; }
+
+        public Memory<VoiceUpdateState> State { get; }
+        public Memory<float> DepopBuffer { get; }
+
+        public DepopPrepareCommand(Memory<VoiceUpdateState> state, Memory<float> depopBuffer, uint mixBufferCount, uint bufferOffset, int nodeId, bool enabled)
+        {
+            Enabled = enabled;
+            NodeId = nodeId;
+            MixBufferCount = mixBufferCount;
+
+            OutputBufferIndices = new ushort[Constants.MixBufferCountMax];
+
+            for (int i = 0; i < Constants.MixBufferCountMax; i++)
+            {
+                OutputBufferIndices[i] = (ushort)(bufferOffset + i);
+            }
+
+            State = state;
+            DepopBuffer = depopBuffer;
+        }
+
+        public void Process(CommandList context)
+        {
+            ref VoiceUpdateState state = ref State.Span[0];
+
+            for (int i = 0; i < MixBufferCount; i++)
+            {
+                if (state.LastSamples[i] != 0)
+                {
+                    DepopBuffer.Span[OutputBufferIndices[i]] += state.LastSamples[i];
+
+                    state.LastSamples[i] = 0;
+                }
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/DeviceSinkCommand.cs

@@ -0,0 +1,108 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Integration;
+using Ryujinx.Audio.Renderer.Server.Sink;
+using System;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class DeviceSinkCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.DeviceSink;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public string DeviceName { get; }
+
+        public int SessionId { get; }
+
+        public uint InputCount { get; }
+        public ushort[] InputBufferIndices { get; }
+
+        public Memory<float> Buffers { get; }
+
+        public DeviceSinkCommand(uint bufferOffset, DeviceSink sink, int sessionId, Memory<float> buffers, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            DeviceName = Encoding.ASCII.GetString(sink.Parameter.DeviceName).TrimEnd('\0');
+            SessionId = sessionId;
+            InputCount = sink.Parameter.InputCount;
+            InputBufferIndices = new ushort[InputCount];
+
+            for (int i = 0; i < InputCount; i++)
+            {
+                InputBufferIndices[i] = (ushort)(bufferOffset + sink.Parameter.Input[i]);
+            }
+
+            if (sink.UpsamplerState != null)
+            {
+                Buffers = sink.UpsamplerState.OutputBuffer;
+            }
+            else
+            {
+                Buffers = buffers;
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private Span<float> GetBuffer(int index, int sampleCount)
+        {
+            return Buffers.Span.Slice(index * sampleCount, sampleCount);
+        }
+
+        public void Process(CommandList context)
+        {
+            IHardwareDevice device = context.OutputDevice;
+
+            if (device.GetSampleRate() == Constants.TargetSampleRate)
+            {
+                int channelCount = (int)device.GetChannelCount();
+                uint bufferCount = Math.Min(device.GetChannelCount(), InputCount);
+
+                const int sampleCount = Constants.TargetSampleCount;
+
+                short[] outputBuffer = new short[bufferCount * sampleCount];
+
+                for (int i = 0; i < bufferCount; i++)
+                {
+                    ReadOnlySpan<float> inputBuffer = GetBuffer(InputBufferIndices[i], sampleCount);
+
+                    for (int j = 0; j < sampleCount; j++)
+                    {
+                        outputBuffer[i + j * channelCount] = PcmHelper.Saturate(inputBuffer[j]);
+                    }
+                }
+
+                device.AppendBuffer(outputBuffer, InputCount);
+            }
+            else
+            {
+                // TODO: support resampling for device only supporting something different
+                throw new NotImplementedException();
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/DownMixSurroundToStereoCommand.cs

@@ -0,0 +1,89 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class DownMixSurroundToStereoCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.DownMixSurroundToStereo;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort[] InputBufferIndices { get; }
+        public ushort[] OutputBufferIndices { get; }
+
+        public float[] Coefficients { get; }
+
+        public DownMixSurroundToStereoCommand(uint bufferOffset, Span<byte> inputBufferOffset, Span<byte> outputBufferOffset, ReadOnlySpan<float> downMixParameter, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            InputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+            OutputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+
+            for (int i = 0; i < Constants.VoiceChannelCountMax; i++)
+            {
+                InputBufferIndices[i] = (ushort)(bufferOffset + inputBufferOffset[i]);
+                OutputBufferIndices[i] = (ushort)(bufferOffset + outputBufferOffset[i]);
+            }
+
+            Coefficients = downMixParameter.ToArray();
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static float DownMixSurroundToStereo(ReadOnlySpan<float> coefficients, float back, float lfe, float center, float front)
+        {
+            return FloatingPointHelper.RoundUp(coefficients[3] * back + coefficients[2] * lfe + coefficients[1] * center + coefficients[0] * front);
+        }
+
+        public void Process(CommandList context)
+        {
+            ReadOnlySpan<float> frontLeft = context.GetBuffer(InputBufferIndices[0]);
+            ReadOnlySpan<float> frontRight = context.GetBuffer(InputBufferIndices[1]);
+            ReadOnlySpan<float> frontCenter = context.GetBuffer(InputBufferIndices[2]);
+            ReadOnlySpan<float> lowFrequency = context.GetBuffer(InputBufferIndices[3]);
+            ReadOnlySpan<float> backLeft = context.GetBuffer(InputBufferIndices[4]);
+            ReadOnlySpan<float> backRight = context.GetBuffer(InputBufferIndices[5]);
+
+            Span<float> stereoLeft = context.GetBuffer(OutputBufferIndices[0]);
+            Span<float> stereoRight = context.GetBuffer(OutputBufferIndices[1]);
+            Span<float> unused2 = context.GetBuffer(OutputBufferIndices[2]);
+            Span<float> unused3 = context.GetBuffer(OutputBufferIndices[3]);
+            Span<float> unused4 = context.GetBuffer(OutputBufferIndices[4]);
+            Span<float> unused5 = context.GetBuffer(OutputBufferIndices[5]);
+
+            for (int i = 0; i < context.SampleCount; i++)
+            {
+                stereoLeft[i] = DownMixSurroundToStereo(Coefficients, backLeft[i], lowFrequency[i], frontCenter[i], frontLeft[i]);
+                stereoRight[i] = DownMixSurroundToStereo(Coefficients, backRight[i], lowFrequency[i], frontCenter[i], frontRight[i]);
+            }
+
+            unused2.Fill(0);
+            unused3.Fill(0);
+            unused4.Fill(0);
+            unused5.Fill(0);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/ICommand.cs

@@ -0,0 +1,37 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public interface ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType { get; }
+
+        public ulong EstimatedProcessingTime { get; }
+
+        public void Process(CommandList context);
+
+        public bool ShouldMeter()
+        {
+            return false;
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/MixCommand.cs

@@ -0,0 +1,125 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.X86;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class MixCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.Mix;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort InputBufferIndex { get; }
+        public ushort OutputBufferIndex { get; }
+
+        public float Volume { get; }
+
+        public MixCommand(uint inputBufferIndex, uint outputBufferIndex, int nodeId, float volume)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            InputBufferIndex = (ushort)inputBufferIndex;
+            OutputBufferIndex = (ushort)outputBufferIndex;
+
+            Volume = volume;
+        }
+
+        private void ProcessMixAvx(Span<float> outputMix, ReadOnlySpan<float> inputMix)
+        {
+            Vector256<float> volumeVec = Vector256.Create(Volume);
+
+            ReadOnlySpan<Vector256<float>> inputVec = MemoryMarshal.Cast<float, Vector256<float>>(inputMix);
+            Span<Vector256<float>> outputVec = MemoryMarshal.Cast<float, Vector256<float>>(outputMix);
+
+            int sisdStart = inputVec.Length * 8;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Avx.Add(outputVec[i], Avx.Ceiling(Avx.Multiply(inputVec[i], volumeVec)));
+            }
+
+            for (int i = sisdStart; i < inputMix.Length; i++)
+            {
+                outputMix[i] += FloatingPointHelper.MultiplyRoundUp(inputMix[i], Volume);
+            }
+        }
+
+        private void ProcessMixSse41(Span<float> outputMix, ReadOnlySpan<float> inputMix)
+        {
+            Vector128<float> volumeVec = Vector128.Create(Volume);
+
+            ReadOnlySpan<Vector128<float>> inputVec = MemoryMarshal.Cast<float, Vector128<float>>(inputMix);
+            Span<Vector128<float>> outputVec = MemoryMarshal.Cast<float, Vector128<float>>(outputMix);
+
+            int sisdStart = inputVec.Length * 4;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Sse.Add(outputVec[i], Sse41.Ceiling(Sse.Multiply(inputVec[i], volumeVec)));
+            }
+
+            for (int i = sisdStart; i < inputMix.Length; i++)
+            {
+                outputMix[i] += FloatingPointHelper.MultiplyRoundUp(inputMix[i], Volume);
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void ProcessMixSlowPath(Span<float> outputMix, ReadOnlySpan<float> inputMix)
+        {
+            for (int i = 0; i < inputMix.Length; i++)
+            {
+                outputMix[i] += FloatingPointHelper.MultiplyRoundUp(inputMix[i], Volume);
+            }
+        }
+
+        private void ProcessMix(Span<float> outputMix, ReadOnlySpan<float> inputMix)
+        {
+            if (Avx.IsSupported)
+            {
+                ProcessMixAvx(outputMix, inputMix);
+            }
+            else if (Sse41.IsSupported)
+            {
+                ProcessMixSse41(outputMix, inputMix);
+            }
+            else
+            {
+                ProcessMixSlowPath(outputMix, inputMix);
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            ReadOnlySpan<float> inputBuffer = context.GetBuffer(InputBufferIndex);
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            ProcessMix(outputBuffer, inputBuffer);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/MixRampCommand.cs

@@ -0,0 +1,83 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Common;
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class MixRampCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.MixRamp;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort InputBufferIndex { get; }
+        public ushort OutputBufferIndex { get; }
+
+        public float Volume0 { get; }
+        public float Volume1 { get; }
+
+        public Memory<VoiceUpdateState> State { get; }
+
+        public int LastSampleIndex { get; }
+
+        public MixRampCommand(float volume0, float volume1, uint inputBufferIndex, uint outputBufferIndex, int lastSampleIndex, Memory<VoiceUpdateState> state, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            InputBufferIndex = (ushort)inputBufferIndex;
+            OutputBufferIndex = (ushort)outputBufferIndex;
+
+            Volume0 = volume0;
+            Volume1 = volume1;
+
+            State = state;
+            LastSampleIndex = lastSampleIndex;
+        }
+
+        private float ProcessMixRamp(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, int sampleCount)
+        {
+            float ramp = (Volume1 - Volume0) / sampleCount;
+            float volume = Volume0;
+            float state = 0;
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                state = FloatingPointHelper.MultiplyRoundUp(inputBuffer[i], volume);
+
+                outputBuffer[i] += state;
+                volume += ramp;
+            }
+
+            return state;
+        }
+
+        public void Process(CommandList context)
+        {
+            ReadOnlySpan<float> inputBuffer = context.GetBuffer(InputBufferIndex);
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            State.Span[0].LastSamples[LastSampleIndex] = ProcessMixRamp(outputBuffer, inputBuffer, (int)context.SampleCount);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/MixRampGroupedCommand.cs

@@ -0,0 +1,106 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Common;
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class MixRampGroupedCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.MixRampGrouped;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public uint MixBufferCount { get; }
+
+        public ushort[] InputBufferIndices { get; }
+        public ushort[] OutputBufferIndices { get; }
+
+        public float[] Volume0 { get; }
+        public float[] Volume1 { get; }
+
+        public Memory<VoiceUpdateState> State { get; }
+
+        public MixRampGroupedCommand(uint mixBufferCount, uint inputBufferIndex, uint outputBufferIndex, Span<float> volume0, Span<float> volume1, Memory<VoiceUpdateState> state, int nodeId)
+        {
+            Enabled = true;
+            MixBufferCount = mixBufferCount;
+            NodeId = nodeId;
+
+            InputBufferIndices = new ushort[Constants.MixBufferCountMax];
+            OutputBufferIndices = new ushort[Constants.MixBufferCountMax];
+            Volume0 = new float[Constants.MixBufferCountMax];
+            Volume1 = new float[Constants.MixBufferCountMax];
+
+            for (int i = 0; i < mixBufferCount; i++)
+            {
+                InputBufferIndices[i] = (ushort)inputBufferIndex;
+                OutputBufferIndices[i] = (ushort)(outputBufferIndex + i);
+
+                Volume0[i] = volume0[i];
+                Volume1[i] = volume1[i];
+            }
+
+            State = state;
+        }
+
+        private float ProcessMixRampGrouped(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, float volume0, float volume1, int sampleCount)
+        {
+            float ramp = (volume1 - volume0) / sampleCount;
+            float volume = volume0;
+            float state = 0;
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                state = FloatingPointHelper.MultiplyRoundUp(inputBuffer[i], volume);
+
+                outputBuffer[i] += state;
+                volume += ramp;
+            }
+
+            return state;
+        }
+
+        public void Process(CommandList context)
+        {
+            for (int i = 0; i < MixBufferCount; i++)
+            {
+                ReadOnlySpan<float> inputBuffer = context.GetBuffer(InputBufferIndices[i]);
+                Span<float> outputBuffer = context.GetBuffer(OutputBufferIndices[i]);
+
+                float volume0 = Volume0[i];
+                float volume1 = Volume1[i];
+
+                ref VoiceUpdateState state = ref State.Span[0];
+
+                if (volume0 != 0 || volume1 != 0)
+                {
+                    state.LastSamples[i] = ProcessMixRampGrouped(outputBuffer, inputBuffer, volume0, volume1, (int)context.SampleCount);
+                }
+                else
+                {
+                    state.LastSamples[i] = 0;
+                }
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/PcmFloatDataSourceCommandVersion1.cs

@@ -0,0 +1,93 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Renderer.Common;
+using System;
+using static Ryujinx.Audio.Renderer.Parameter.VoiceInParameter;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class PcmFloatDataSourceCommandVersion1 : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.PcmFloatDataSourceVersion1;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort OutputBufferIndex { get; }
+        public uint SampleRate { get; }
+        public uint ChannelIndex { get; }
+
+        public uint ChannelCount { get; }
+
+        public float Pitch { get; }
+
+        public WaveBuffer[] WaveBuffers { get; }
+
+        public Memory<VoiceUpdateState> State { get; }
+        public DecodingBehaviour DecodingBehaviour { get; }
+
+        public PcmFloatDataSourceCommandVersion1(ref Server.Voice.VoiceState serverState, Memory<VoiceUpdateState> state, ushort outputBufferIndex, ushort channelIndex, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            OutputBufferIndex = (ushort)(channelIndex + outputBufferIndex);
+            SampleRate = serverState.SampleRate;
+            ChannelIndex = channelIndex;
+            ChannelCount = serverState.ChannelsCount;
+            Pitch = serverState.Pitch;
+
+            WaveBuffers = new WaveBuffer[Constants.VoiceWaveBufferCount];
+
+            for (int i = 0; i < WaveBuffers.Length; i++)
+            {
+                ref Server.Voice.WaveBuffer voiceWaveBuffer = ref serverState.WaveBuffers[i];
+
+                WaveBuffers[i] = voiceWaveBuffer.ToCommon(1);
+            }
+
+            State = state;
+            DecodingBehaviour = serverState.DecodingBehaviour;
+        }
+
+        public void Process(CommandList context)
+        {
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            DataSourceHelper.WaveBufferInformation info = new DataSourceHelper.WaveBufferInformation()
+            {
+                State = State,
+                SourceSampleRate = SampleRate,
+                SampleFormat = SampleFormat.PcmInt16,
+                Pitch = Pitch,
+                DecodingBehaviour = DecodingBehaviour,
+                WaveBuffers = WaveBuffers,
+                ExtraParameter = 0,
+                ExtraParameterSize = 0,
+                ChannelIndex = (int)ChannelIndex,
+                ChannelCount = (int)ChannelCount,
+            };
+
+            DataSourceHelper.ProcessWaveBuffers(context.MemoryManager, outputBuffer, info, context.SampleRate, (int)context.SampleCount);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/PcmInt16DataSourceCommandVersion1.cs

@@ -0,0 +1,93 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Renderer.Common;
+using System;
+using static Ryujinx.Audio.Renderer.Parameter.VoiceInParameter;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class PcmInt16DataSourceCommandVersion1 : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.PcmInt16DataSourceVersion1;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort OutputBufferIndex { get; }
+        public uint SampleRate { get; }
+        public uint ChannelIndex { get; }
+
+        public uint ChannelCount { get; }
+
+        public float Pitch { get; }
+
+        public WaveBuffer[] WaveBuffers { get; }
+
+        public Memory<VoiceUpdateState> State { get; }
+        public DecodingBehaviour DecodingBehaviour { get; }
+
+        public PcmInt16DataSourceCommandVersion1(ref Server.Voice.VoiceState serverState, Memory<VoiceUpdateState> state, ushort outputBufferIndex, ushort channelIndex, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            OutputBufferIndex = (ushort)(channelIndex + outputBufferIndex);
+            SampleRate = serverState.SampleRate;
+            ChannelIndex = channelIndex;
+            ChannelCount = serverState.ChannelsCount;
+            Pitch = serverState.Pitch;
+
+            WaveBuffers = new WaveBuffer[Constants.VoiceWaveBufferCount];
+
+            for (int i = 0; i < WaveBuffers.Length; i++)
+            {
+                ref Server.Voice.WaveBuffer voiceWaveBuffer = ref serverState.WaveBuffers[i];
+
+                WaveBuffers[i] = voiceWaveBuffer.ToCommon(1);
+            }
+
+            State = state;
+            DecodingBehaviour = serverState.DecodingBehaviour;
+        }
+
+        public void Process(CommandList context)
+        {
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            DataSourceHelper.WaveBufferInformation info = new DataSourceHelper.WaveBufferInformation()
+            {
+                State = State,
+                SourceSampleRate = SampleRate,
+                SampleFormat = SampleFormat.PcmInt16,
+                Pitch = Pitch,
+                DecodingBehaviour = DecodingBehaviour,
+                WaveBuffers = WaveBuffers,
+                ExtraParameter = 0,
+                ExtraParameterSize = 0,
+                ChannelIndex = (int)ChannelIndex,
+                ChannelCount = (int)ChannelCount,
+            };
+
+            DataSourceHelper.ProcessWaveBuffers(context.MemoryManager, outputBuffer, info, context.SampleRate, (int)context.SampleCount);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/PerformanceCommand.cs

@@ -0,0 +1,64 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Server.Performance;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class PerformanceCommand : ICommand
+    {
+        public enum Type
+        {
+            Invalid,
+            Start,
+            End
+        }
+
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.Performance;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public PerformanceEntryAddresses PerformanceEntryAddresses { get; }
+
+        public Type PerformanceType { get; set; }
+
+        public PerformanceCommand(ref PerformanceEntryAddresses performanceEntryAddresses, Type performanceType, int nodeId)
+        {
+            Enabled = true;
+            PerformanceEntryAddresses = performanceEntryAddresses;
+            PerformanceType = performanceType;
+            NodeId = nodeId;
+        }
+
+        public void Process(CommandList context)
+        {
+            if (PerformanceType == Type.Start)
+            {
+                PerformanceEntryAddresses.SetStartTime(context.GetTimeElapsedSinceDspStartedProcessing());
+            }
+            else if (PerformanceType == Type.End)
+            {
+                PerformanceEntryAddresses.SetProcessingTime(context.GetTimeElapsedSinceDspStartedProcessing());
+                PerformanceEntryAddresses.IncrementEntryCount();
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/Reverb3dCommand.cs

@@ -0,0 +1,263 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Dsp.State;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using Ryujinx.Audio.Renderer.Server.Effect;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class Reverb3dCommand : ICommand
+    {
+        private static readonly int[] OutputEarlyIndicesTableMono = new int[20] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableMono = new int[20] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableMono = new int[1] { 0 };
+
+        private static readonly int[] OutputEarlyIndicesTableStereo = new int[20] { 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableStereo = new int[20] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableStereo = new int[2] { 0, 1 };
+
+        private static readonly int[] OutputEarlyIndicesTableQuadraphonic = new int[20] { 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 0, 0, 0, 0, 3, 3, 3 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableQuadraphonic = new int[20] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableQuadraphonic = new int[4] { 0, 1, 2, 3 };
+
+        private static readonly int[] OutputEarlyIndicesTableSurround = new int[40] { 4, 5, 0, 5, 0, 5, 1, 5, 1, 5, 1, 5, 1, 5, 2, 5, 2, 5, 2, 5, 1, 5, 1, 5, 1, 5, 0, 5, 0, 5, 0, 5, 0, 5, 3, 5, 3, 5, 3, 5 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableSurround = new int[40] { 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableSurround = new int[6] { 0, 1, 2, 3, -1, 3 };
+
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.Reverb3d;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort InputBufferIndex { get; }
+        public ushort OutputBufferIndex { get; }
+
+        public Reverb3dParameter Parameter => _parameter;
+        public Memory<Reverb3dState> State { get; }
+        public ulong WorkBuffer { get; }
+        public ushort[] OutputBufferIndices { get; }
+        public ushort[] InputBufferIndices { get; }
+
+        public bool IsEffectEnabled { get; }
+
+        private Reverb3dParameter _parameter;
+
+        public Reverb3dCommand(uint bufferOffset, Reverb3dParameter parameter, Memory<Reverb3dState> state, bool isEnabled, ulong workBuffer, int nodeId)
+        {
+            Enabled = true;
+            IsEffectEnabled = isEnabled;
+            NodeId = nodeId;
+            _parameter = parameter;
+            State = state;
+            WorkBuffer = workBuffer;
+
+            InputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+            OutputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+
+            for (int i = 0; i < Parameter.ChannelCount; i++)
+            {
+                InputBufferIndices[i] = (ushort)(bufferOffset + Parameter.Input[i]);
+                OutputBufferIndices[i] = (ushort)(bufferOffset + Parameter.Output[i]);
+            }
+        }
+
+        private void ProcessReverb3dMono(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverb3dGeneric(outputBuffers, inputBuffers, sampleCount, OutputEarlyIndicesTableMono, TargetEarlyDelayLineIndicesTableMono, TargetOutputFeedbackIndicesTableMono);
+        }
+
+        private void ProcessReverb3dStereo(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverb3dGeneric(outputBuffers, inputBuffers, sampleCount, OutputEarlyIndicesTableStereo, TargetEarlyDelayLineIndicesTableStereo, TargetOutputFeedbackIndicesTableStereo);
+        }
+
+        private void ProcessReverb3dQuadraphonic(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverb3dGeneric(outputBuffers, inputBuffers, sampleCount, OutputEarlyIndicesTableQuadraphonic, TargetEarlyDelayLineIndicesTableQuadraphonic, TargetOutputFeedbackIndicesTableQuadraphonic);
+        }
+
+        private void ProcessReverb3dSurround(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverb3dGeneric(outputBuffers, inputBuffers, sampleCount, OutputEarlyIndicesTableSurround, TargetEarlyDelayLineIndicesTableSurround, TargetOutputFeedbackIndicesTableSurround);
+        }
+
+        private void ProcessReverb3dGeneric(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount, ReadOnlySpan<int> outputEarlyIndicesTable, ReadOnlySpan<int> targetEarlyDelayLineIndicesTable, ReadOnlySpan<int> targetOutputFeedbackIndicesTable)
+        {
+            const int delayLineSampleIndexOffset = 1;
+
+            ref Reverb3dState state = ref State.Span[0];
+
+            bool isMono = Parameter.ChannelCount == 1;
+            bool isSurround = Parameter.ChannelCount == 6;
+
+            float[] outputValues = new float[Constants.ChannelCountMax];
+            float[] channelInput = new float[Parameter.ChannelCount];
+            float[] feedbackValues = new float[4];
+            float[] feedbackOutputValues = new float[4];
+            float[] values = new float[4];
+
+            for (int sampleIndex = 0; sampleIndex < sampleCount; sampleIndex++)
+            {
+                outputValues.AsSpan().Fill(0);
+
+                float tapOut = state.PreDelayLine.TapUnsafe(state.ReflectionDelayTime, delayLineSampleIndexOffset);
+
+                for (int i = 0; i < targetEarlyDelayLineIndicesTable.Length; i++)
+                {
+                    int earlyDelayIndex = targetEarlyDelayLineIndicesTable[i];
+                    int outputIndex = outputEarlyIndicesTable[i];
+
+                    float tempTapOut = state.PreDelayLine.TapUnsafe(state.EarlyDelayTime[earlyDelayIndex], delayLineSampleIndexOffset);
+
+                    outputValues[outputIndex] += tempTapOut * state.EarlyGain[earlyDelayIndex];
+                }
+
+                float targetPreDelayValue = 0;
+
+                for (int channelIndex = 0; channelIndex < Parameter.ChannelCount; channelIndex++)
+                {
+                    channelInput[channelIndex] = inputBuffers[channelIndex].Span[sampleIndex];
+                    targetPreDelayValue += channelInput[channelIndex];
+                }
+
+                for (int i = 0; i < Parameter.ChannelCount; i++)
+                {
+                    outputValues[i] *= state.EarlyReflectionsGain;
+                }
+
+                state.PreviousPreDelayValue = (targetPreDelayValue * state.TargetPreDelayGain) + (state.PreviousPreDelayValue * state.PreviousPreDelayGain);
+
+                state.PreDelayLine.Update(state.PreviousPreDelayValue);
+
+                for (int i = 0; i < state.FdnDelayLines.Length; i++)
+                {
+                    float fdnValue = state.FdnDelayLines[i].Read();
+
+                    float feedbackOutputValue = fdnValue * state.DecayDirectFdnGain[i] + state.PreviousFeedbackOutputDecayed[i];
+
+                    state.PreviousFeedbackOutputDecayed[i] = (fdnValue * state.DecayCurrentFdnGain[i]) + (feedbackOutputValue * state.DecayCurrentOutputGain[i]);
+
+                    feedbackOutputValues[i] = feedbackOutputValue;
+                }
+
+                feedbackValues[0] = feedbackOutputValues[2] + feedbackOutputValues[1];
+                feedbackValues[1] = -feedbackOutputValues[0] - feedbackOutputValues[3];
+                feedbackValues[2] = feedbackOutputValues[0] - feedbackOutputValues[3];
+                feedbackValues[3] = feedbackOutputValues[1] - feedbackOutputValues[2];
+
+                for (int i = 0; i < state.DecayDelays1.Length; i++)
+                {
+                    float temp = state.DecayDelays1[i].Update(tapOut * state.LateReverbGain + feedbackValues[i]);
+
+                    values[i] = state.DecayDelays2[i].Update(temp);
+
+                    state.FdnDelayLines[i].Update(values[i]);
+                }
+
+                for (int channelIndex = 0; channelIndex < targetOutputFeedbackIndicesTable.Length; channelIndex++)
+                {
+                    int targetOutputFeedbackIndex = targetOutputFeedbackIndicesTable[channelIndex];
+
+                    if (targetOutputFeedbackIndex >= 0)
+                    {
+                        outputBuffers[channelIndex].Span[sampleIndex] = (outputValues[channelIndex] + values[targetOutputFeedbackIndex] + channelInput[channelIndex] * state.DryGain);
+                    }
+                }
+
+                if (isMono)
+                {
+                    outputBuffers[0].Span[sampleIndex] += values[1];
+                }
+
+                if (isSurround)
+                {
+                    outputBuffers[4].Span[sampleIndex] += (outputValues[4] + state.BackLeftDelayLine.Update((values[2] - values[3]) * 0.5f) + channelInput[4] * state.DryGain);
+                }
+            }
+        }
+
+        public void ProcessReverb3d(CommandList context)
+        {
+            Debug.Assert(Parameter.IsChannelCountValid());
+
+            if (IsEffectEnabled && Parameter.IsChannelCountValid())
+            {
+                ReadOnlyMemory<float>[] inputBuffers = new ReadOnlyMemory<float>[Parameter.ChannelCount];
+                Memory<float>[] outputBuffers = new Memory<float>[Parameter.ChannelCount];
+
+                for (int i = 0; i < Parameter.ChannelCount; i++)
+                {
+                    inputBuffers[i] = context.GetBufferMemory(InputBufferIndices[i]);
+                    outputBuffers[i] = context.GetBufferMemory(OutputBufferIndices[i]);
+                }
+
+                switch (Parameter.ChannelCount)
+                {
+                    case 1:
+                        ProcessReverb3dMono(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 2:
+                        ProcessReverb3dStereo(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 4:
+                        ProcessReverb3dQuadraphonic(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 6:
+                        ProcessReverb3dSurround(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    default:
+                        throw new NotImplementedException($"{Parameter.ChannelCount}");
+                }
+            }
+            else
+            {
+                for (int i = 0; i < Parameter.ChannelCount; i++)
+                {
+                    if (InputBufferIndices[i] != OutputBufferIndices[i])
+                    {
+                        context.GetBufferMemory(InputBufferIndices[i]).CopyTo(context.GetBufferMemory(OutputBufferIndices[i]));
+                    }
+                }
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            ref Reverb3dState state = ref State.Span[0];
+
+            if (IsEffectEnabled)
+            {
+                if (Parameter.ParameterStatus == UsageState.Invalid)
+                {
+                    state = new Reverb3dState(ref _parameter, WorkBuffer);
+                }
+                else if (Parameter.ParameterStatus == UsageState.New)
+                {
+                    state.UpdateParameter(ref _parameter);
+                }
+            }
+
+            ProcessReverb3d(context);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/ReverbCommand.cs

@@ -0,0 +1,284 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Dsp.State;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class ReverbCommand : ICommand
+    {
+        private static readonly int[] OutputEarlyIndicesTableMono = new int[10] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableMono = new int[10] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        private static readonly int[] OutputIndicesTableMono = new int[4] { 0, 0, 0, 0 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableMono = new int[4] { 0, 1, 2, 3 };
+
+        private static readonly int[] OutputEarlyIndicesTableStereo = new int[10] { 0, 0, 1, 1, 0, 1, 0, 0, 1, 1 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableStereo = new int[10] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        private static readonly int[] OutputIndicesTableStereo = new int[4] { 0, 0, 1, 1 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableStereo = new int[4] { 2, 0, 3, 1 };
+
+        private static readonly int[] OutputEarlyIndicesTableQuadraphonic = new int[10] { 0, 0, 1, 1, 0, 1, 2, 2, 3, 3 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableQuadraphonic = new int[10] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        private static readonly int[] OutputIndicesTableQuadraphonic = new int[4] { 0, 1, 2, 3 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableQuadraphonic = new int[4] { 0, 1, 2, 3 };
+
+        private static readonly int[] OutputEarlyIndicesTableSurround = new int[20] { 0, 5, 0, 5, 1, 5, 1, 5, 4, 5, 4, 5, 2, 5, 2, 5, 3, 5, 3, 5 };
+        private static readonly int[] TargetEarlyDelayLineIndicesTableSurround = new int[20] { 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9 };
+        private static readonly int[] OutputIndicesTableSurround = new int[Constants.ChannelCountMax] { 0, 1, 2, 3, 4, 5 };
+        private static readonly int[] TargetOutputFeedbackIndicesTableSurround = new int[Constants.ChannelCountMax] { 0, 1, 2, 3, -1, 3 };
+
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.Reverb;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ReverbParameter Parameter => _parameter;
+        public Memory<ReverbState> State { get; }
+        public ulong WorkBuffer { get; }
+        public ushort[] OutputBufferIndices { get; }
+        public ushort[] InputBufferIndices { get; }
+        public bool IsLongSizePreDelaySupported { get; }
+
+        public bool IsEffectEnabled { get; }
+
+        private ReverbParameter _parameter;
+
+        private const int FixedPointPrecision = 14;
+
+        public ReverbCommand(uint bufferOffset, ReverbParameter parameter, Memory<ReverbState> state, bool isEnabled, ulong workBuffer, int nodeId, bool isLongSizePreDelaySupported)
+        {
+            Enabled = true;
+            IsEffectEnabled = isEnabled;
+            NodeId = nodeId;
+            _parameter = parameter;
+            State = state;
+            WorkBuffer = workBuffer;
+
+            InputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+            OutputBufferIndices = new ushort[Constants.VoiceChannelCountMax];
+
+            for (int i = 0; i < Parameter.ChannelCount; i++)
+            {
+                InputBufferIndices[i] = (ushort)(bufferOffset + Parameter.Input[i]);
+                OutputBufferIndices[i] = (ushort)(bufferOffset + Parameter.Output[i]);
+            }
+
+            IsLongSizePreDelaySupported = isLongSizePreDelaySupported;
+        }
+
+        private void ProcessReverbMono(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverbGeneric(outputBuffers,
+                     inputBuffers,
+                     sampleCount,
+                     OutputEarlyIndicesTableMono,
+                     TargetEarlyDelayLineIndicesTableMono,
+                     TargetOutputFeedbackIndicesTableMono,
+                     OutputIndicesTableMono);
+        }
+
+        private void ProcessReverbStereo(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverbGeneric(outputBuffers,
+                     inputBuffers,
+                     sampleCount,
+                     OutputEarlyIndicesTableStereo,
+                     TargetEarlyDelayLineIndicesTableStereo,
+                     TargetOutputFeedbackIndicesTableStereo,
+                     OutputIndicesTableStereo);
+        }
+
+        private void ProcessReverbQuadraphonic(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverbGeneric(outputBuffers,
+                     inputBuffers,
+                     sampleCount,
+                     OutputEarlyIndicesTableQuadraphonic,
+                     TargetEarlyDelayLineIndicesTableQuadraphonic,
+                     TargetOutputFeedbackIndicesTableQuadraphonic,
+                     OutputIndicesTableQuadraphonic);
+        }
+
+        private void ProcessReverbSurround(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount)
+        {
+            ProcessReverbGeneric(outputBuffers,
+                     inputBuffers,
+                     sampleCount,
+                     OutputEarlyIndicesTableSurround,
+                     TargetEarlyDelayLineIndicesTableSurround,
+                     TargetOutputFeedbackIndicesTableSurround,
+                     OutputIndicesTableSurround);
+        }
+
+        private void ProcessReverbGeneric(Memory<float>[] outputBuffers, ReadOnlyMemory<float>[] inputBuffers, uint sampleCount, ReadOnlySpan<int> outputEarlyIndicesTable, ReadOnlySpan<int> targetEarlyDelayLineIndicesTable, ReadOnlySpan<int> targetOutputFeedbackIndicesTable, ReadOnlySpan<int> outputIndicesTable)
+        {
+            ref ReverbState state = ref State.Span[0];
+
+            bool isSurround = Parameter.ChannelCount == 6;
+
+            float reverbGain = FixedPointHelper.ToFloat(Parameter.ReverbGain, FixedPointPrecision);
+            float lateGain = FixedPointHelper.ToFloat(Parameter.LateGain, FixedPointPrecision);
+            float outGain = FixedPointHelper.ToFloat(Parameter.OutGain, FixedPointPrecision);
+            float dryGain = FixedPointHelper.ToFloat(Parameter.DryGain, FixedPointPrecision);
+
+            float[] outputValues = new float[Constants.ChannelCountMax];
+            float[] feedbackValues = new float[4];
+            float[] feedbackOutputValues = new float[4];
+            float[] channelInput = new float[Parameter.ChannelCount];
+
+            for (int sampleIndex = 0; sampleIndex < sampleCount; sampleIndex++)
+            {
+                outputValues.AsSpan().Fill(0);
+
+                for (int i = 0; i < targetEarlyDelayLineIndicesTable.Length; i++)
+                {
+                    int earlyDelayIndex = targetEarlyDelayLineIndicesTable[i];
+                    int outputIndex = outputEarlyIndicesTable[i];
+
+                    float tapOutput = state.PreDelayLine.TapUnsafe(state.EarlyDelayTime[earlyDelayIndex], 0);
+
+                    outputValues[outputIndex] += tapOutput * state.EarlyGain[earlyDelayIndex];
+                }
+
+                if (isSurround)
+                {
+                    outputValues[5] *= 0.2f;
+                }
+
+                float targetPreDelayValue = 0;
+
+                for (int channelIndex = 0; channelIndex < Parameter.ChannelCount; channelIndex++)
+                {
+                    channelInput[channelIndex] = inputBuffers[channelIndex].Span[sampleIndex] * 64;
+                    targetPreDelayValue += channelInput[channelIndex] * reverbGain;
+                }
+
+                state.PreDelayLine.Update(targetPreDelayValue);
+
+                float lateValue = state.PreDelayLine.Tap(state.PreDelayLineDelayTime) * lateGain;
+
+                for (int i = 0; i < state.FdnDelayLines.Length; i++)
+                {
+                    feedbackOutputValues[i] = state.FdnDelayLines[i].Read() * state.HighFrequencyDecayDirectGain[i] + state.PreviousFeedbackOutput[i] * state.HighFrequencyDecayPreviousGain[i];
+                    state.PreviousFeedbackOutput[i] = feedbackOutputValues[i];
+                }
+
+                feedbackValues[0] = feedbackOutputValues[2] + feedbackOutputValues[1];
+                feedbackValues[1] = -feedbackOutputValues[0] - feedbackOutputValues[3];
+                feedbackValues[2] = feedbackOutputValues[0] - feedbackOutputValues[3];
+                feedbackValues[3] = feedbackOutputValues[1] - feedbackOutputValues[2];
+
+                for (int i = 0; i < state.FdnDelayLines.Length; i++)
+                {
+                    feedbackOutputValues[i] = state.DecayDelays[i].Update(feedbackValues[i] + lateValue);
+                    state.FdnDelayLines[i].Update(feedbackOutputValues[i]);
+                }
+
+                for (int i = 0; i < targetOutputFeedbackIndicesTable.Length; i++)
+                {
+                    int targetOutputFeedbackIndex = targetOutputFeedbackIndicesTable[i];
+                    int outputIndex = outputIndicesTable[i];
+
+                    if (targetOutputFeedbackIndex >= 0)
+                    {
+                        outputValues[outputIndex] += feedbackOutputValues[targetOutputFeedbackIndex];
+                    }
+                }
+
+                if (isSurround)
+                {
+                    outputValues[4] += state.BackLeftDelayLine.Update((feedbackOutputValues[2] - feedbackOutputValues[3]) * 0.5f);
+                }
+
+                for (int channelIndex = 0; channelIndex < Parameter.ChannelCount; channelIndex++)
+                {
+                    outputBuffers[channelIndex].Span[sampleIndex] = (outputValues[channelIndex] * outGain + channelInput[channelIndex] * dryGain) / 64;
+                }
+            }
+        }
+
+        private void ProcessReverb(CommandList context)
+        {
+            Debug.Assert(Parameter.IsChannelCountValid());
+
+            if (IsEffectEnabled && Parameter.IsChannelCountValid())
+            {
+                ReadOnlyMemory<float>[] inputBuffers = new ReadOnlyMemory<float>[Parameter.ChannelCount];
+                Memory<float>[] outputBuffers = new Memory<float>[Parameter.ChannelCount];
+
+                for (int i = 0; i < Parameter.ChannelCount; i++)
+                {
+                    inputBuffers[i] = context.GetBufferMemory(InputBufferIndices[i]);
+                    outputBuffers[i] = context.GetBufferMemory(OutputBufferIndices[i]);
+                }
+
+                switch (Parameter.ChannelCount)
+                {
+                    case 1:
+                        ProcessReverbMono(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 2:
+                        ProcessReverbStereo(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 4:
+                        ProcessReverbQuadraphonic(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    case 6:
+                        ProcessReverbSurround(outputBuffers, inputBuffers, context.SampleCount);
+                        break;
+                    default:
+                        throw new NotImplementedException($"{Parameter.ChannelCount}");
+                }
+            }
+            else
+            {
+                for (int i = 0; i < Parameter.ChannelCount; i++)
+                {
+                    if (InputBufferIndices[i] != OutputBufferIndices[i])
+                    {
+                        context.GetBufferMemory(InputBufferIndices[i]).CopyTo(context.GetBufferMemory(OutputBufferIndices[i]));
+                    }
+                }
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            ref ReverbState state = ref State.Span[0];
+
+            if (IsEffectEnabled)
+            {
+                if (Parameter.Status == Server.Effect.UsageState.Invalid)
+                {
+                    state = new ReverbState(ref _parameter, WorkBuffer, IsLongSizePreDelaySupported);
+                }
+                else if (Parameter.Status == Server.Effect.UsageState.New)
+                {
+                    state.UpdateParameter(ref _parameter);
+                }
+            }
+
+            ProcessReverb(context);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/UpsampleCommand.cs

@@ -0,0 +1,87 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Renderer.Server.Upsampler;
+using System;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class UpsampleCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.Upsample;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public uint BufferCount { get; }
+        public uint InputBufferIndex { get; }
+        public uint InputSampleCount { get; }
+        public uint InputSampleRate { get; }
+
+        public UpsamplerState UpsamplerInfo { get; }
+
+        public Memory<float> OutBuffer { get; }
+
+        public UpsampleCommand(uint bufferOffset, UpsamplerState info, uint inputCount, Span<byte> inputBufferOffset, uint bufferCount, uint sampleCount, uint sampleRate, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            InputBufferIndex = 0;
+            OutBuffer = info.OutputBuffer;
+            BufferCount = bufferCount;
+            InputSampleCount = sampleCount;
+            InputSampleRate = sampleRate;
+            info.SourceSampleCount = inputCount;
+            info.InputBufferIndices = new ushort[inputCount];
+
+            for (int i = 0; i < inputCount; i++)
+            {
+                info.InputBufferIndices[i] = (ushort)(bufferOffset + inputBufferOffset[i]);
+            }
+
+            UpsamplerInfo = info;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private Span<float> GetBuffer(int index, int sampleCount)
+        {
+            return UpsamplerInfo.OutputBuffer.Span.Slice(index * sampleCount, sampleCount);
+        }
+
+        public void Process(CommandList context)
+        {
+            float ratio = (float)InputSampleRate / Constants.TargetSampleRate;
+
+            uint bufferCount = Math.Min(BufferCount, UpsamplerInfo.SourceSampleCount);
+
+            for (int i = 0; i < bufferCount; i++)
+            {
+                Span<float> inputBuffer = context.GetBuffer(UpsamplerInfo.InputBufferIndices[i]);
+                Span<float> outputBuffer = GetBuffer(UpsamplerInfo.InputBufferIndices[i], (int)UpsamplerInfo.SampleCount);
+
+                float fraction = 0.0f;
+
+                ResamplerHelper.ResampleForUpsampler(outputBuffer, inputBuffer, ratio, ref fraction, (int)(InputSampleCount / ratio));
+            }
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/VolumeCommand.cs

@@ -0,0 +1,125 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.X86;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class VolumeCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.Volume;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort InputBufferIndex { get; }
+        public ushort OutputBufferIndex { get; }
+
+        public float Volume { get; }
+
+        public VolumeCommand(float volume, uint bufferIndex, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            InputBufferIndex = (ushort)bufferIndex;
+            OutputBufferIndex = (ushort)bufferIndex;
+
+            Volume = volume;
+        }
+
+        private void ProcessVolumeAvx(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer)
+        {
+            Vector256<float> volumeVec = Vector256.Create(Volume);
+
+            ReadOnlySpan<Vector256<float>> inputVec = MemoryMarshal.Cast<float, Vector256<float>>(inputBuffer);
+            Span<Vector256<float>> outputVec = MemoryMarshal.Cast<float, Vector256<float>>(outputBuffer);
+
+            int sisdStart = inputVec.Length * 8;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Avx.Ceiling(Avx.Multiply(inputVec[i], volumeVec));
+            }
+
+            for (int i = sisdStart; i < inputBuffer.Length; i++)
+            {
+                outputBuffer[i] = FloatingPointHelper.MultiplyRoundUp(inputBuffer[i], Volume);
+            }
+        }
+
+        private void ProcessVolumeSse41(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer)
+        {
+            Vector128<float> volumeVec = Vector128.Create(Volume);
+
+            ReadOnlySpan<Vector128<float>> inputVec = MemoryMarshal.Cast<float, Vector128<float>>(inputBuffer);
+            Span<Vector128<float>> outputVec = MemoryMarshal.Cast<float, Vector128<float>>(outputBuffer);
+
+            int sisdStart = inputVec.Length * 4;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Sse41.Ceiling(Sse.Multiply(inputVec[i], volumeVec));
+            }
+
+            for (int i = sisdStart; i < inputBuffer.Length; i++)
+            {
+                outputBuffer[i] = FloatingPointHelper.MultiplyRoundUp(inputBuffer[i], Volume);
+            }
+        }
+
+        private void ProcessVolume(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer)
+        {
+            if (Avx.IsSupported)
+            {
+                ProcessVolumeAvx(outputBuffer, inputBuffer);
+            }
+            else if (Sse41.IsSupported)
+            {
+                ProcessVolumeSse41(outputBuffer, inputBuffer);
+            }
+            else
+            {
+                ProcessVolumeSlowPath(outputBuffer, inputBuffer);
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private void ProcessVolumeSlowPath(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer)
+        {
+            for (int i = 0; i < outputBuffer.Length; i++)
+            {
+                outputBuffer[i] = FloatingPointHelper.MultiplyRoundUp(inputBuffer[i], Volume);
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            ReadOnlySpan<float> inputBuffer = context.GetBuffer(InputBufferIndex);
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            ProcessVolume(outputBuffer, inputBuffer);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/Command/VolumeRampCommand.cs

@@ -0,0 +1,71 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.Command
+{
+    public class VolumeRampCommand : ICommand
+    {
+        public bool Enabled { get; set; }
+
+        public int NodeId { get; }
+
+        public CommandType CommandType => CommandType.VolumeRamp;
+
+        public ulong EstimatedProcessingTime { get; set; }
+
+        public ushort InputBufferIndex { get; }
+        public ushort OutputBufferIndex { get; }
+
+        public float Volume0 { get; }
+        public float Volume1 { get; }
+
+        public VolumeRampCommand(float volume0, float volume1, uint bufferIndex, int nodeId)
+        {
+            Enabled = true;
+            NodeId = nodeId;
+
+            InputBufferIndex = (ushort)bufferIndex;
+            OutputBufferIndex = (ushort)bufferIndex;
+
+            Volume0 = volume0;
+            Volume1 = volume1;
+        }
+
+        private void ProcessVolumeRamp(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, int sampleCount)
+        {
+            float ramp = (Volume1 - Volume0) / sampleCount;
+
+            float volume = Volume0;
+
+            for (int i = 0; i < sampleCount; i++)
+            {
+                outputBuffer[i] = FloatingPointHelper.MultiplyRoundUp(inputBuffer[i], volume);
+                volume += ramp;
+            }
+        }
+
+        public void Process(CommandList context)
+        {
+            ReadOnlySpan<float> inputBuffer = context.GetBuffer(InputBufferIndex);
+            Span<float> outputBuffer = context.GetBuffer(OutputBufferIndex);
+
+            ProcessVolumeRamp(outputBuffer, inputBuffer, (int)context.SampleCount);
+        }
+    }
+}

Ryujinx.Audio/Renderer/Dsp/DataSourceHelper.cs

@@ -0,0 +1,409 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Renderer.Common;
+using Ryujinx.Audio.Renderer.Dsp.State;
+using Ryujinx.Common.Logging;
+using Ryujinx.Memory;
+using System;
+using System.Buffers;
+using System.Diagnostics;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.X86;
+using static Ryujinx.Audio.Renderer.Parameter.VoiceInParameter;
+
+namespace Ryujinx.Audio.Renderer.Dsp
+{
+    public static class DataSourceHelper
+    {
+        private const int FixedPointPrecision = 15;
+
+        public class WaveBufferInformation
+        {
+            public Memory<VoiceUpdateState> State;
+            public uint SourceSampleRate;
+            public SampleFormat SampleFormat;
+            public float Pitch;
+            public DecodingBehaviour DecodingBehaviour;
+            public WaveBuffer[] WaveBuffers;
+            public ulong ExtraParameter;
+            public ulong ExtraParameterSize;
+            public int ChannelIndex;
+            public int ChannelCount;
+            public SampleRateConversionQuality SrcQuality;
+        }
+
+        private static int GetPitchLimitBySrcQuality(SampleRateConversionQuality quality)
+        {
+            switch (quality)
+            {
+                case SampleRateConversionQuality.Default:
+                case SampleRateConversionQuality.Low:
+                    return 4;
+                case SampleRateConversionQuality.High:
+                    return 8;
+                default:
+                    throw new ArgumentException($"{quality}");
+            }
+        }
+
+        public static void ProcessWaveBuffers(IVirtualMemoryManager memoryManager, Span<float> outputBuffer, WaveBufferInformation info, uint targetSampleRate, int sampleCount)
+        {
+            const int tempBufferSize = 0x3F00;
+
+            ref VoiceUpdateState state = ref info.State.Span[0];
+
+            short[] tempBuffer = ArrayPool<short>.Shared.Rent(tempBufferSize);
+
+            float sampleRateRatio = ((float)info.SourceSampleRate / targetSampleRate * info.Pitch);
+
+            float fraction = state.Fraction;
+            int waveBufferIndex = (int)state.WaveBufferIndex;
+            ulong playedSampleCount = state.PlayedSampleCount;
+            int offset = state.Offset;
+            uint waveBufferConsumed = state.WaveBufferConsumed;
+
+            int pitchMaxLength = GetPitchLimitBySrcQuality(info.SrcQuality);
+
+            int totalNeededSize = (int)MathF.Truncate(fraction + sampleRateRatio * sampleCount);
+
+            if (totalNeededSize + pitchMaxLength <= tempBufferSize && totalNeededSize >= 0)
+            {
+                int sourceSampleCountToProcess = sampleCount;
+
+                int maxSampleCountPerIteration = Math.Min((int)MathF.Truncate((tempBufferSize - fraction) / sampleRateRatio), sampleCount);
+
+                bool isStarving = false;
+
+                int i = 0;
+
+                while (i < sourceSampleCountToProcess)
+                {
+                    int tempBufferIndex = 0;
+
+                    if (!info.DecodingBehaviour.HasFlag(DecodingBehaviour.SkipPitchAndSampleRateConversion))
+                    {
+                        state.Pitch.ToSpan().Slice(0, pitchMaxLength).CopyTo(tempBuffer.AsSpan());
+                        tempBufferIndex += pitchMaxLength;
+                    }
+
+                    int sampleCountToProcess = Math.Min(sourceSampleCountToProcess, maxSampleCountPerIteration);
+
+                    int y = 0;
+
+                    int sampleCountToDecode = (int)MathF.Truncate(fraction + sampleRateRatio * sampleCountToProcess);
+
+                    while (y < sampleCountToDecode)
+                    {
+                        if (waveBufferIndex >= Constants.VoiceWaveBufferCount)
+                        {
+                            Logger.Error?.Print(LogClass.AudioRenderer, $"Invalid WaveBuffer index {waveBufferIndex}");
+
+                            waveBufferIndex = 0;
+                            playedSampleCount = 0;
+                        }
+
+                        if (!state.IsWaveBufferValid[waveBufferIndex])
+                        {
+                            isStarving = true;
+                            break;
+                        }
+
+                        ref WaveBuffer waveBuffer = ref info.WaveBuffers[waveBufferIndex];
+
+                        if (offset == 0 && info.SampleFormat == SampleFormat.Adpcm && waveBuffer.Context != 0)
+                        {
+                            state.LoopContext = memoryManager.Read<AdpcmLoopContext>(waveBuffer.Context);
+                        }
+
+                        Span<short> tempSpan = tempBuffer.AsSpan().Slice(tempBufferIndex + y);
+
+                        int decodedSampleCount = -1;
+
+                        int targetSampleStartOffset;
+                        int targetSampleEndOffset;
+
+                        if (state.LoopCount > 0 && waveBuffer.LoopStartSampleOffset != 0 && waveBuffer.LoopEndSampleOffset != 0 && waveBuffer.LoopStartSampleOffset <= waveBuffer.LoopEndSampleOffset)
+                        {
+                            targetSampleStartOffset = (int)waveBuffer.LoopStartSampleOffset;
+                            targetSampleEndOffset = (int)waveBuffer.LoopEndSampleOffset;
+                        }
+                        else
+                        {
+                            targetSampleStartOffset = (int)waveBuffer.StartSampleOffset;
+                            targetSampleEndOffset = (int)waveBuffer.EndSampleOffset;
+                        }
+
+                        int targetWaveBufferSampleCount = targetSampleEndOffset - targetSampleStartOffset;
+
+                        switch (info.SampleFormat)
+                        {
+                            case SampleFormat.Adpcm:
+                                ReadOnlySpan<byte> waveBufferAdpcm = ReadOnlySpan<byte>.Empty;
+
+                                if (waveBuffer.Buffer != 0 && waveBuffer.BufferSize != 0)
+                                {
+                                    // TODO: we are possibly copying a lot of unneeded data here, we should only take what we need.
+                                    waveBufferAdpcm = memoryManager.GetSpan(waveBuffer.Buffer, (int)waveBuffer.BufferSize);
+                                }
+
+                                ReadOnlySpan<short> coefficients = MemoryMarshal.Cast<byte, short>(memoryManager.GetSpan(info.ExtraParameter, (int)info.ExtraParameterSize));
+                                decodedSampleCount = AdpcmHelper.Decode(tempSpan, waveBufferAdpcm, targetSampleStartOffset, targetSampleEndOffset, offset, sampleCountToDecode - y, coefficients, ref state.LoopContext);
+                                break;
+                            case SampleFormat.PcmInt16:
+                                ReadOnlySpan<short> waveBufferPcm16 = ReadOnlySpan<short>.Empty;
+
+                                if (waveBuffer.Buffer != 0 && waveBuffer.BufferSize != 0)
+                                {
+                                    ulong bufferOffset = waveBuffer.Buffer + PcmHelper.GetBufferOffset<short>(targetSampleStartOffset, offset, info.ChannelCount);
+                                    int bufferSize = PcmHelper.GetBufferSize<short>(targetSampleStartOffset, targetSampleEndOffset, offset, sampleCountToDecode - y) * info.ChannelCount;
+
+                                    waveBufferPcm16 = MemoryMarshal.Cast<byte, short>(memoryManager.GetSpan(bufferOffset, bufferSize));
+                                }
+
+                                decodedSampleCount = PcmHelper.Decode(tempSpan, waveBufferPcm16, targetSampleStartOffset, targetSampleEndOffset, info.ChannelIndex, info.ChannelCount);
+                                break;
+                            case SampleFormat.PcmFloat:
+                                ReadOnlySpan<float> waveBufferPcmFloat = ReadOnlySpan<float>.Empty;
+
+                                if (waveBuffer.Buffer != 0 && waveBuffer.BufferSize != 0)
+                                {
+                                    ulong bufferOffset = waveBuffer.Buffer + PcmHelper.GetBufferOffset<float>(targetSampleStartOffset, offset, info.ChannelCount);
+                                    int bufferSize = PcmHelper.GetBufferSize<float>(targetSampleStartOffset, targetSampleEndOffset, offset, sampleCountToDecode - y) * info.ChannelCount;
+
+                                    waveBufferPcmFloat = MemoryMarshal.Cast<byte, float>(memoryManager.GetSpan(bufferOffset, bufferSize));
+                                }
+
+                                decodedSampleCount = PcmHelper.Decode(tempSpan, waveBufferPcmFloat, targetSampleStartOffset, targetSampleEndOffset, info.ChannelIndex, info.ChannelCount);
+                                break;
+                            default:
+                                Logger.Warning?.Print(LogClass.AudioRenderer, $"Unsupported sample format {info.SampleFormat}");
+                                break;
+                        }
+
+                        Debug.Assert(decodedSampleCount <= sampleCountToDecode);
+
+                        if (decodedSampleCount < 0)
+                        {
+                            Logger.Warning?.Print(LogClass.AudioRenderer, $"Decoding failed, skipping WaveBuffer");
+
+                            state.MarkEndOfBufferWaveBufferProcessing(ref waveBuffer, ref waveBufferIndex, ref waveBufferConsumed, ref playedSampleCount);
+                            decodedSampleCount = 0;
+                        }
+
+                        y += decodedSampleCount;
+                        offset += decodedSampleCount;
+                        playedSampleCount += (uint)decodedSampleCount;
+
+                        if (offset >= targetWaveBufferSampleCount || decodedSampleCount == 0)
+                        {
+                            offset = 0;
+
+                            if (waveBuffer.Looping)
+                            {
+                                state.LoopCount++;
+
+                                if (waveBuffer.LoopCount >= 0)
+                                {
+                                    if (decodedSampleCount == 0 || state.LoopCount > waveBuffer.LoopCount)
+                                    {
+                                        state.MarkEndOfBufferWaveBufferProcessing(ref waveBuffer, ref waveBufferIndex, ref waveBufferConsumed, ref playedSampleCount);
+                                    }
+                                }
+
+                                if (decodedSampleCount == 0)
+                                {
+                                    isStarving = true;
+                                    break;
+                                }
+
+                                if (info.DecodingBehaviour.HasFlag(DecodingBehaviour.PlayedSampleCountResetWhenLooping))
+                                {
+                                    playedSampleCount = 0;
+                                }
+                            }
+                            else
+                            {
+                                state.MarkEndOfBufferWaveBufferProcessing(ref waveBuffer, ref waveBufferIndex, ref waveBufferConsumed, ref playedSampleCount);
+                            }
+                        }
+                    }
+
+                    Span<float> outputSpan = outputBuffer.Slice(i);
+                    Span<int> outputSpanInt = MemoryMarshal.Cast<float, int>(outputSpan);
+
+                    if (info.DecodingBehaviour.HasFlag(DecodingBehaviour.SkipPitchAndSampleRateConversion))
+                    {
+                        for (int j = 0; j < y; j++)
+                        {
+                            outputBuffer[j] = tempBuffer[j];
+                        }
+                    }
+                    else
+                    {
+                        Span<short> tempSpan = tempBuffer.AsSpan().Slice(tempBufferIndex + y);
+
+                        tempSpan.Slice(0, sampleCountToDecode - y).Fill(0);
+
+                        ToFloat(outputBuffer, outputSpanInt, sampleCountToProcess);
+
+                        ResamplerHelper.Resample(outputBuffer, tempBuffer, sampleRateRatio, ref fraction, sampleCountToProcess, info.SrcQuality, y != sourceSampleCountToProcess || info.Pitch != 1.0f);
+
+                        tempBuffer.AsSpan().Slice(sampleCountToDecode, pitchMaxLength).CopyTo(state.Pitch.ToSpan());
+                    }
+
+                    i += sampleCountToProcess;
+                }
+
+                Debug.Assert(sourceSampleCountToProcess == i || !isStarving);
+
+                state.WaveBufferConsumed = waveBufferConsumed;
+                state.Offset = offset;
+                state.PlayedSampleCount = playedSampleCount;
+                state.WaveBufferIndex = (uint)waveBufferIndex;
+                state.Fraction = fraction;
+            }
+
+            ArrayPool<short>.Shared.Return(tempBuffer);
+        }
+
+        private static void ToFloatAvx(Span<float> output, ReadOnlySpan<int> input, int sampleCount)
+        {
+            ReadOnlySpan<Vector256<int>> inputVec = MemoryMarshal.Cast<int, Vector256<int>>(input);
+            Span<Vector256<float>> outputVec = MemoryMarshal.Cast<float, Vector256<float>>(output);
+
+            int sisdStart = inputVec.Length * 8;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Avx.ConvertToVector256Single(inputVec[i]);
+            }
+
+            for (int i = sisdStart; i < sampleCount; i++)
+            {
+                output[i] = input[i];
+            }
+        }
+
+        private static void ToFloatSse2(Span<float> output, ReadOnlySpan<int> input, int sampleCount)
+        {
+            ReadOnlySpan<Vector128<int>> inputVec = MemoryMarshal.Cast<int, Vector128<int>>(input);
+            Span<Vector128<float>> outputVec = MemoryMarshal.Cast<float, Vector128<float>>(output);
+
+            int sisdStart = inputVec.Length * 4;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Sse2.ConvertToVector128Single(inputVec[i]);
+            }
+
+            for (int i = sisdStart; i < sampleCount; i++)
+            {
+                output[i] = input[i];
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void ToFloatSlow(Span<float> output, ReadOnlySpan<int> input, int sampleCount)
+        {
+            for (int i = 0; i < sampleCount; i++)
+            {
+                output[i] = input[i];
+            }
+        }
+
+        public static void ToFloat(Span<float> output, ReadOnlySpan<int> input, int sampleCount)
+        {
+            if (Avx.IsSupported)
+            {
+                ToFloatAvx(output, input, sampleCount);
+            }
+            else if (Sse2.IsSupported)
+            {
+                ToFloatSse2(output, input, sampleCount);
+            }
+            else
+            {
+                ToFloatSlow(output, input, sampleCount);
+            }
+        }
+
+        public static void ToIntAvx(Span<int> output, ReadOnlySpan<float> input, int sampleCount)
+        {
+            ReadOnlySpan<Vector256<float>> inputVec = MemoryMarshal.Cast<float, Vector256<float>>(input);
+            Span<Vector256<int>> outputVec = MemoryMarshal.Cast<int, Vector256<int>>(output);
+
+            int sisdStart = inputVec.Length * 8;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Avx.ConvertToVector256Int32(inputVec[i]);
+            }
+
+            for (int i = sisdStart; i < sampleCount; i++)
+            {
+                output[i] = (int)input[i];
+            }
+        }
+
+        public static void ToIntSse2(Span<int> output, ReadOnlySpan<float> input, int sampleCount)
+        {
+            ReadOnlySpan<Vector128<float>> inputVec = MemoryMarshal.Cast<float, Vector128<float>>(input);
+            Span<Vector128<int>> outputVec = MemoryMarshal.Cast<int, Vector128<int>>(output);
+
+            int sisdStart = inputVec.Length * 4;
+
+            for (int i = 0; i < inputVec.Length; i++)
+            {
+                outputVec[i] = Avx.ConvertToVector128Int32(inputVec[i]);
+            }
+
+            for (int i = sisdStart; i < sampleCount; i++)
+            {
+                output[i] = (int)input[i];
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void ToIntSlow(Span<int> output, ReadOnlySpan<float> input, int sampleCount)
+        {
+            for (int i = 0; i < sampleCount; i++)
+            {
+                output[i] = (int)input[i];
+            }
+        }
+
+        public static void ToInt(Span<int> output, ReadOnlySpan<float> input, int sampleCount)
+        {
+            if (Avx.IsSupported)
+            {
+                ToIntAvx(output, input, sampleCount);
+            }
+            else if (Sse2.IsSupported)
+            {
+                ToIntSse2(output, input, sampleCount);
+            }
+            else
+            {
+                ToIntSlow(output, input, sampleCount);
+            }
+        }
+    }
+}