[ci skip] Add macOS native Audio Backend (ryubing/ryujinx!252)

See merge request ryubing/ryujinx!252

THIS IS CURRENTLY NOT EXPOSED BY THE UI OR HANDLED BY THE EMULATOR. Expect a commit later to add it to configs, UI, etc.

src/Ryujinx.Audio.Backends.Apple/AppleHardwareDeviceDriver.cs

@@ -0,0 +1,241 @@
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Common.Logging;
+using Ryujinx.Memory;
+using System;
+using System.Collections.Concurrent;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Runtime.Versioning;
+using Ryujinx.Audio.Backends.Apple.Native;
+using static Ryujinx.Audio.Backends.Apple.Native.AudioToolbox;
+using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
+
+namespace Ryujinx.Audio.Backends.Apple
+{
+    [SupportedOSPlatform("macos")]
+    [SupportedOSPlatform("ios")]
+    public class AppleHardwareDeviceDriver : IHardwareDeviceDriver
+    {
+        private readonly ManualResetEvent _updateRequiredEvent;
+        private readonly ManualResetEvent _pauseEvent;
+        private readonly ConcurrentDictionary<AppleHardwareDeviceSession, byte> _sessions;
+        private readonly bool _supportSurroundConfiguration;
+
+        public float Volume { get; set; }
+
+        public AppleHardwareDeviceDriver()
+        {
+            _updateRequiredEvent = new ManualResetEvent(false);
+            _pauseEvent = new ManualResetEvent(true);
+            _sessions = new ConcurrentDictionary<AppleHardwareDeviceSession, byte>();
+
+            _supportSurroundConfiguration = TestSurroundSupport();
+
+            Volume = 1f;
+        }
+
+        private bool TestSurroundSupport()
+        {
+            try
+            {   
+                var format = GetAudioFormat(SampleFormat.PcmFloat, Constants.TargetSampleRate, 6);
+                
+                int result = AudioQueueNewOutput(
+                    ref format,
+                    IntPtr.Zero,
+                    IntPtr.Zero,
+                    IntPtr.Zero,
+                    IntPtr.Zero,
+                    0,
+                    out IntPtr testQueue);
+
+                if (result == 0)
+                {
+                    AudioChannelLayout layout = new AudioChannelLayout
+                    {
+                        AudioChannelLayoutTag = kAudioChannelLayoutTag_MPEG_5_1_A,
+                        AudioChannelBitmap = 0,
+                        NumberChannelDescriptions = 0
+                    };
+
+                    int layoutResult = AudioQueueSetProperty(
+                        testQueue, 
+                        kAudioQueueProperty_ChannelLayout, 
+                        ref layout, 
+                        (uint)Marshal.SizeOf<AudioChannelLayout>());
+
+                    if (layoutResult == 0)
+                    {
+                        AudioQueueDispose(testQueue, true);
+                        return true;
+                    }
+                    
+                    AudioQueueDispose(testQueue, true);
+                }
+
+                return false;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public static bool IsSupported => IsSupportedInternal();
+
+        private static bool IsSupportedInternal()
+        {
+            try
+            {
+                var format = GetAudioFormat(SampleFormat.PcmInt16, Constants.TargetSampleRate, 2);
+                int result = AudioQueueNewOutput(
+                    ref format,
+                    IntPtr.Zero,
+                    IntPtr.Zero,
+                    IntPtr.Zero,
+                    IntPtr.Zero,
+                    0,
+                    out IntPtr testQueue);
+
+                if (result == 0)
+                {
+                    AudioQueueDispose(testQueue, true);
+                    return true;
+                }
+
+                return false;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public ManualResetEvent GetUpdateRequiredEvent()
+        {
+            return _updateRequiredEvent;
+        }
+
+        public ManualResetEvent GetPauseEvent()
+        {
+            return _pauseEvent;
+        }
+
+        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 (direction != Direction.Output)
+            {
+                throw new NotImplementedException("Input direction is currently not implemented on Apple backend!");
+            }
+
+            AppleHardwareDeviceSession session = new(this, memoryManager, sampleFormat, sampleRate, channelCount);
+
+            _sessions.TryAdd(session, 0);
+
+            return session;
+        }
+
+        internal bool Unregister(AppleHardwareDeviceSession session)
+        {
+            return _sessions.TryRemove(session, out _);
+        }
+
+        internal static AudioStreamBasicDescription GetAudioFormat(SampleFormat sampleFormat, uint sampleRate, uint channelCount)
+        {
+            uint formatFlags;
+            uint bitsPerChannel;
+
+            switch (sampleFormat)
+            {
+                case SampleFormat.PcmInt8:
+                    formatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
+                    bitsPerChannel = 8;
+                    break;
+                case SampleFormat.PcmInt16:
+                    formatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
+                    bitsPerChannel = 16;
+                    break;
+                case SampleFormat.PcmInt32:
+                    formatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
+                    bitsPerChannel = 32;
+                    break;
+                case SampleFormat.PcmFloat:
+                    formatFlags = kAudioFormatFlagIsFloat | kAudioFormatFlagIsPacked;
+                    bitsPerChannel = 32;
+                    break;
+                default:
+                    throw new ArgumentException($"Unsupported sample format {sampleFormat}");
+            }
+
+            uint bytesPerFrame = (bitsPerChannel / 8) * channelCount;
+
+            return new AudioStreamBasicDescription
+            {
+                SampleRate = sampleRate,
+                FormatID = kAudioFormatLinearPCM,
+                FormatFlags = formatFlags,
+                BytesPerPacket = bytesPerFrame,
+                FramesPerPacket = 1,
+                BytesPerFrame = bytesPerFrame,
+                ChannelsPerFrame = channelCount,
+                BitsPerChannel = bitsPerChannel,
+                Reserved = 0
+            };
+        }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                foreach (AppleHardwareDeviceSession session in _sessions.Keys)
+                {
+                    session.Dispose();
+                }
+
+                _pauseEvent.Dispose();
+            }
+        }
+
+        public bool SupportsSampleRate(uint sampleRate)
+        {
+            return true;
+        }
+
+        public bool SupportsSampleFormat(SampleFormat sampleFormat)
+        {
+            return sampleFormat != SampleFormat.PcmInt24;
+        }
+
+        public bool SupportsChannelCount(uint channelCount)
+        {
+            if (channelCount == 6)
+            {
+                return _supportSurroundConfiguration;
+            }
+
+            return true;
+        }
+
+        public bool SupportsDirection(Direction direction)
+        {
+            return direction != Direction.Input;
+        }
+    }
+}