chore: SDL3 (ryubing/ryujinx!207)

See merge request ryubing/ryujinx!207

src/Ryujinx.Audio.Backends.SDL3/SDL3HardwareDeviceSession.cs

@@ -0,0 +1,248 @@
+using Ryujinx.Audio.Backends.Common;
+using Ryujinx.Audio.Common;
+using Ryujinx.Common.Logging;
+using Ryujinx.Common.Memory;
+using Ryujinx.Memory;
+using System;
+using System.Collections.Concurrent;
+using System.Threading;
+using SDL;
+using static SDL.SDL3;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Backends.SDL3
+{
+
+
+
+    unsafe class SDL3HardwareDeviceSession : HardwareDeviceSessionOutputBase
+    {
+        private readonly SDL3HardwareDeviceDriver _driver;
+        private readonly ConcurrentQueue<SDL3AudioBuffer> _queuedBuffers;
+        private readonly DynamicRingBuffer _ringBuffer;
+        private ulong _playedSampleCount;
+        private readonly ManualResetEvent _updateRequiredEvent;
+        private SDL_AudioStream* _outputStream;
+        private bool _hasSetupError;
+        private readonly SDL_AudioStreamCallback _callbackDelegate;
+        private readonly int _bytesPerFrame;
+        private uint _sampleCount;
+        private bool _started;
+        private float _volume;
+        private readonly SDL_AudioFormat _nativeSampleFormat;
+
+        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        internal delegate void SDL_AudioStreamCallback(nint session, SDL_AudioStream* stream, int stream_count, int device_count);
+
+        public SDL3HardwareDeviceSession(SDL3HardwareDeviceDriver driver, IVirtualMemoryManager memoryManager, SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount) : base(memoryManager, requestedSampleFormat, requestedSampleRate, requestedChannelCount)
+        {
+            _driver = driver;
+            _updateRequiredEvent = _driver.GetUpdateRequiredEvent();
+            _queuedBuffers = new ConcurrentQueue<SDL3AudioBuffer>();
+            _ringBuffer = new DynamicRingBuffer();
+            _callbackDelegate = Update;
+            _bytesPerFrame = BackendHelper.GetSampleSize(RequestedSampleFormat) * (int)RequestedChannelCount;
+            _nativeSampleFormat = SDL3HardwareDeviceDriver.GetSDL3Format(RequestedSampleFormat);
+            _sampleCount = uint.MaxValue;
+            _started = false;
+            _volume = 1f;
+        }
+
+        private void EnsureAudioStreamSetup(AudioBuffer buffer)
+        {
+            uint bufferSampleCount = (uint)GetSampleCount(buffer);
+            bool needAudioSetup = (_outputStream == null && !_hasSetupError) ||
+                (bufferSampleCount >= Constants.TargetSampleCount && bufferSampleCount < _sampleCount);
+
+            if (needAudioSetup)
+            {
+                _sampleCount = Math.Max(Constants.TargetSampleCount, bufferSampleCount);
+
+                SDL_AudioStream* newOutputStream = SDL3HardwareDeviceDriver.OpenStream(RequestedSampleFormat, RequestedSampleRate, RequestedChannelCount, _sampleCount, _callbackDelegate);
+
+                _hasSetupError = newOutputStream == null;
+
+                if (!_hasSetupError)
+                {
+                    if (_outputStream != null)
+                    {
+                        SDL_DestroyAudioStream(_outputStream);
+                    }
+
+                    _outputStream = newOutputStream;
+
+                    if (_started) {
+                        SDL_ResumeAudioStreamDevice(_outputStream);
+                    } else {
+                        SDL_PauseAudioStreamDevice(_outputStream);
+                    }
+
+                    Logger.Info?.Print(LogClass.Audio, $"New audio stream setup with a target sample count of {_sampleCount}");
+                }
+            }
+        }
+
+        private unsafe void Update(nint userdata, SDL_AudioStream* streamDevice, int additionalAmount, int totalAmmount)
+        {
+            using SpanOwner<byte> stream = SpanOwner<byte>.Rent(additionalAmount);
+            Span<byte> streamSpan = stream.Span;
+
+
+            int maxFrameCount = (int)GetSampleCount(additionalAmount);
+            int bufferedFrames = _ringBuffer.Length / _bytesPerFrame;
+
+            int frameCount = Math.Min(bufferedFrames, maxFrameCount);
+
+            if (frameCount == 0)
+            {
+                // SDL3 left the responsibility to the user to clear the buffer.
+                streamSpan.Clear();
+
+                return;
+            }
+
+            using SpanOwner<byte> samplesOwner = SpanOwner<byte>.Rent(frameCount * _bytesPerFrame);
+
+            Span<byte> samples = samplesOwner.Span;
+
+            _ringBuffer.Read(samples, 0, samples.Length);
+
+            // Zero the dest buffer
+            streamSpan.Clear();
+
+            fixed (byte* pStreamDst = streamSpan) {
+                fixed (byte* pStreamSrc = samples)
+                {
+
+                    // Apply volume to written data
+                    SDL_MixAudio(pStreamDst, pStreamSrc, _nativeSampleFormat, (uint)samples.Length, _driver.Volume * _volume);
+                    SDL_PutAudioStreamData(streamDevice, (nint)pStreamDst, additionalAmount);
+                }
+            }
+
+            ulong sampleCount = GetSampleCount(samples.Length);
+
+            ulong availaibleSampleCount = sampleCount;
+
+            bool needUpdate = false;
+
+            while (availaibleSampleCount > 0 && _queuedBuffers.TryPeek(out SDL3AudioBuffer driverBuffer))
+            {
+                ulong sampleStillNeeded = driverBuffer.SampleCount - Interlocked.Read(ref driverBuffer.SamplePlayed);
+                ulong playedAudioBufferSampleCount = Math.Min(sampleStillNeeded, availaibleSampleCount);
+
+                ulong currentSamplePlayed = Interlocked.Add(ref driverBuffer.SamplePlayed, playedAudioBufferSampleCount);
+                availaibleSampleCount -= playedAudioBufferSampleCount;
+
+                if (currentSamplePlayed == driverBuffer.SampleCount)
+                {
+                    _queuedBuffers.TryDequeue(out _);
+
+                    needUpdate = true;
+                }
+
+                Interlocked.Add(ref _playedSampleCount, playedAudioBufferSampleCount);
+            }
+
+            // Notify the output if needed.
+            if (needUpdate)
+            {
+                _updateRequiredEvent.Set();
+            }
+        }
+
+        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)
+        {
+            EnsureAudioStreamSetup(buffer);
+
+            if (_outputStream != null)
+            {
+                SDL3AudioBuffer driverBuffer = new(buffer.DataPointer, GetSampleCount(buffer));
+
+                _ringBuffer.Write(buffer.Data, 0, buffer.Data.Length);
+
+                _queuedBuffers.Enqueue(driverBuffer);
+            }
+            else
+            {
+                Interlocked.Add(ref _playedSampleCount, GetSampleCount(buffer));
+
+                _updateRequiredEvent.Set();
+            }
+        }
+
+        public override void SetVolume(float volume)
+        {
+            _volume = volume;
+        }
+
+        public override void Start()
+        {
+            if (!_started)
+            {
+                if (_outputStream != null)
+                {
+                    SDL_ResumeAudioStreamDevice(_outputStream);
+                }
+
+                _started = true;
+            }
+        }
+
+        public override void Stop()
+        {
+            if (_started)
+            {
+                if (_outputStream != null)
+                {
+                    SDL_PauseAudioStreamDevice(_outputStream);
+                }
+
+                _started = false;
+            }
+        }
+
+        public override void UnregisterBuffer(AudioBuffer buffer) { }
+
+        public override bool WasBufferFullyConsumed(AudioBuffer buffer)
+        {
+            if (!_queuedBuffers.TryPeek(out SDL3AudioBuffer driverBuffer))
+            {
+                return true;
+            }
+
+            return driverBuffer.DriverIdentifier != buffer.DataPointer;
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing && _driver.Unregister(this))
+            {
+                PrepareToClose();
+                Stop();
+
+                if (_outputStream != null)
+                {
+                    SDL_DestroyAudioStream(_outputStream);
+                }
+            }
+        }
+
+        public override void Dispose()
+        {
+            Dispose(true);
+        }
+    }
+}