Move solution and projects to src

src/Ryujinx.Audio/Integration/HardwareDeviceImpl.cs

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+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, float volume)
+        {
+            _session = deviceDriver.OpenDeviceSession(IHardwareDeviceDriver.Direction.Output, null, SampleFormat.PcmInt16, sampleRate, channelCount, volume);
+            _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 void SetVolume(float volume)
+        {
+            _session.SetVolume(volume);
+        }
+
+        public float GetVolume()
+        {
+            return _session.GetVolume();
+        }
+
+        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();
+            }
+        }
+    }
+}

src/Ryujinx.Audio/Integration/IHardwareDevice.cs

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+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>
+        /// Sets the volume level for this device.
+        /// </summary>
+        /// <param name="volume">The volume level to set.</param>
+        void SetVolume(float volume);
+
+        /// <summary>
+        /// Gets the volume level for this device.
+        /// </summary>
+        /// <returns>The volume level of this device.</returns>
+        float GetVolume();
+
+        /// <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;
+        }
+    }
+}

src/Ryujinx.Audio/Integration/IHardwareDeviceDriver.cs

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+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, float volume = 1f);
+
+        ManualResetEvent GetUpdateRequiredEvent();
+        ManualResetEvent GetPauseEvent();
+
+        bool SupportsDirection(Direction direction);
+        bool SupportsSampleRate(uint sampleRate);
+        bool SupportsSampleFormat(SampleFormat sampleFormat);
+        bool SupportsChannelCount(uint channelCount);
+
+        static abstract bool IsSupported { get; }
+
+        IHardwareDeviceDriver GetRealDeviceDriver()
+        {
+            return this;
+        }
+    }
+}

src/Ryujinx.Audio/Integration/IHardwareDeviceSession.cs

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+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();
+    }
+}

src/Ryujinx.Audio/Integration/IWritableEvent.cs

@@ -0,0 +1,18 @@
+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();
+    }
+}