1 files changed, 247 insertions, 0 deletions
diff --git a/src/Ryujinx.Audio.Backends.SoundIo/SoundIoHardwareDeviceDriver.cs b/src/Ryujinx.Audio.Backends.SoundIo/SoundIoHardwareDeviceDriver.cs
new file mode 100644
index 00000000..02da2776
--- /dev/null
+++ b/src/Ryujinx.Audio.Backends.SoundIo/SoundIoHardwareDeviceDriver.cs
@@ -0,0 +1,247 @@
+using Ryujinx.Audio.Backends.SoundIo.Native;
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Memory;
+using System;
+using System.Collections.Concurrent;
+using System.Threading;
+using static Ryujinx.Audio.Backends.SoundIo.Native.SoundIo;
+using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
+
+namespace Ryujinx.Audio.Backends.SoundIo
+{
+    public class SoundIoHardwareDeviceDriver : IHardwareDeviceDriver
+    {
+        private readonly SoundIoContext _audioContext;
+        private readonly SoundIoDeviceContext _audioDevice;
+        private readonly ManualResetEvent _updateRequiredEvent;
+        private readonly ManualResetEvent _pauseEvent;
+        private readonly ConcurrentDictionary<SoundIoHardwareDeviceSession, byte> _sessions;
+        private int _disposeState;
+
+        public SoundIoHardwareDeviceDriver()
+        {
+            _audioContext = SoundIoContext.Create();
+            _updateRequiredEvent = new ManualResetEvent(false);
+            _pauseEvent = new ManualResetEvent(true);
+            _sessions = new ConcurrentDictionary<SoundIoHardwareDeviceSession, byte>();
+
+            _audioContext.Connect();
+            _audioContext.FlushEvents();
+
+            _audioDevice = FindValidAudioDevice(_audioContext, true);
+        }
+
+        public static bool IsSupported => IsSupportedInternal();
+
+        private static bool IsSupportedInternal()
+        {
+            SoundIoContext context = null;
+            SoundIoDeviceContext device = null;
+            SoundIoOutStreamContext stream = null;
+
+            bool backendDisconnected = false;
+
+            try
+            {
+                context = SoundIoContext.Create();
+                context.OnBackendDisconnect = err =>
+                {
+                    backendDisconnected = true;
+                };
+
+                context.Connect();
+                context.FlushEvents();
+
+                if (backendDisconnected)
+                {
+                    return false;
+                }
+
+                if (context.OutputDeviceCount == 0)
+                {
+                    return false;
+                }
+
+                device = FindValidAudioDevice(context);
+
+                if (device == null || backendDisconnected)
+                {
+                    return false;
+                }
+
+                stream = device.CreateOutStream();
+
+                if (stream == null || backendDisconnected)
+                {
+                    return false;
+                }
+
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+            finally
+            {
+                stream?.Dispose();
+                context?.Dispose();
+            }
+        }
+
+        private static SoundIoDeviceContext FindValidAudioDevice(SoundIoContext audioContext, bool fallback = false)
+        {
+            SoundIoDeviceContext defaultAudioDevice = audioContext.GetOutputDevice(audioContext.DefaultOutputDeviceIndex);
+
+            if (!defaultAudioDevice.IsRaw)
+            {
+                return defaultAudioDevice;
+            }
+
+            for (int i = 0; i < audioContext.OutputDeviceCount; i++)
+            {
+                SoundIoDeviceContext audioDevice = audioContext.GetOutputDevice(i);
+
+                if (audioDevice.Id == defaultAudioDevice.Id && !audioDevice.IsRaw)
+                {
+                    return audioDevice;
+                }
+            }
+
+            return fallback ? defaultAudioDevice : null;
+        }
+
+        public ManualResetEvent GetUpdateRequiredEvent()
+        {
+            return _updateRequiredEvent;
+        }
+
+        public ManualResetEvent GetPauseEvent()
+        {
+            return _pauseEvent;
+        }
+
+        public IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount, float volume)
+        {
+            if (channelCount == 0)
+            {
+                channelCount = 2;
+            }
+
+            if (sampleRate == 0)
+            {
+                sampleRate = Constants.TargetSampleRate;
+            }
+
+            volume = Math.Clamp(volume, 0, 1);
+
+            if (direction != Direction.Output)
+            {
+                throw new NotImplementedException("Input direction is currently not implemented on SoundIO backend!");
+            }
+
+            SoundIoHardwareDeviceSession session = new SoundIoHardwareDeviceSession(this, memoryManager, sampleFormat, sampleRate, channelCount, volume);
+
+            _sessions.TryAdd(session, 0);
+
+            return session;
+        }
+
+        internal bool Unregister(SoundIoHardwareDeviceSession session)
+        {
+            return _sessions.TryRemove(session, out _);
+        }
+
+        public static SoundIoFormat GetSoundIoFormat(SampleFormat format)
+        {
+            return format switch
+            {
+                SampleFormat.PcmInt8 => SoundIoFormat.S8,
+                SampleFormat.PcmInt16 => SoundIoFormat.S16LE,
+                SampleFormat.PcmInt24 => SoundIoFormat.S24LE,
+                SampleFormat.PcmInt32 => SoundIoFormat.S32LE,
+                SampleFormat.PcmFloat => SoundIoFormat.Float32LE,
+                _ => throw new ArgumentException ($"Unsupported sample format {format}"),
+            };
+        }
+
+        internal SoundIoOutStreamContext OpenStream(SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount)
+        {
+            SoundIoFormat driverSampleFormat = GetSoundIoFormat(requestedSampleFormat);
+
+            if (!_audioDevice.SupportsSampleRate((int)requestedSampleRate))
+            {
+                throw new ArgumentException($"This sound device does not support a sample rate of {requestedSampleRate}Hz");
+            }
+
+            if (!_audioDevice.SupportsFormat(driverSampleFormat))
+            {
+                throw new ArgumentException($"This sound device does not support {requestedSampleFormat}");
+            }
+
+            if (!_audioDevice.SupportsChannelCount((int)requestedChannelCount))
+            {
+                throw new ArgumentException($"This sound device does not support channel count {requestedChannelCount}");
+            }
+
+            SoundIoOutStreamContext result = _audioDevice.CreateOutStream();
+
+            result.Name = "Ryujinx";
+            result.Layout = SoundIoChannelLayout.GetDefaultValue((int)requestedChannelCount);
+            result.Format = driverSampleFormat;
+            result.SampleRate = (int)requestedSampleRate;
+
+            return result;
+        }
+
+        internal void FlushContextEvents()
+        {
+            _audioContext.FlushEvents();
+        }
+
+        public void Dispose()
+        {
+            if (Interlocked.CompareExchange(ref _disposeState, 1, 0) == 0)
+            {
+                Dispose(true);
+            }
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                foreach (SoundIoHardwareDeviceSession session in _sessions.Keys)
+                {
+                    session.Dispose();
+                }
+
+                _audioContext.Disconnect();
+                _audioContext.Dispose();
+                _pauseEvent.Dispose();
+            }
+        }
+
+        public bool SupportsSampleRate(uint sampleRate)
+        {
+            return _audioDevice.SupportsSampleRate((int)sampleRate);
+        }
+
+        public bool SupportsSampleFormat(SampleFormat sampleFormat)
+        {
+            return _audioDevice.SupportsFormat(GetSoundIoFormat(sampleFormat));
+        }
+
+        public bool SupportsChannelCount(uint channelCount)
+        {
+            return _audioDevice.SupportsChannelCount((int)channelCount);
+        }
+
+        public bool SupportsDirection(Direction direction)
+        {
+            // TODO: add direction input when supported.
+            return direction == Direction.Output;
+        }
+    }
+}