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https://github.com/Ryujinx/Ryujinx.git
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* audio: Implement a SDL2 backend This adds support to SDL2 as an audio backend. It has the same compatibility level as OpenAL without its issues. I also took the liberty of restructuring the SDL2 code to have one shared project between audio and input. The configuration version was also incremented. * Address gdkchan's comments * Fix update logic * Add an heuristic to pick the correct target sample count wanted by the game * Address gdkchan's comments * Address Ac_k's comments * Fix audren output * Address gdkchan's comments
185 lines
5.5 KiB
C#
185 lines
5.5 KiB
C#
using Ryujinx.Audio.Backends.Common;
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using Ryujinx.Audio.Common;
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using Ryujinx.Audio.Integration;
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using Ryujinx.Memory;
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using Ryujinx.SDL2.Common;
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Threading;
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using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
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using static SDL2.SDL;
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namespace Ryujinx.Audio.Backends.SDL2
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{
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public class SDL2HardwareDeviceDriver : IHardwareDeviceDriver
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{
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private object _lock = new object();
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private ManualResetEvent _updateRequiredEvent;
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private List<SDL2HardwareDeviceSession> _sessions;
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public SDL2HardwareDeviceDriver()
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{
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_updateRequiredEvent = new ManualResetEvent(false);
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_sessions = new List<SDL2HardwareDeviceSession>();
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SDL2Driver.Instance.Initialize();
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}
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public static bool IsSupported => IsSupportedInternal();
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private static bool IsSupportedInternal()
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{
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uint device = OpenStream(SampleFormat.PcmInt16, Constants.TargetSampleRate, Constants.ChannelCountMax, Constants.TargetSampleCount, null);
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if (device != 0)
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{
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SDL_CloseAudioDevice(device);
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}
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return device != 0;
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}
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public ManualResetEvent GetUpdateRequiredEvent()
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{
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return _updateRequiredEvent;
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}
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public IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount)
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{
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if (channelCount == 0)
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{
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channelCount = 2;
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}
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if (sampleRate == 0)
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{
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sampleRate = Constants.TargetSampleRate;
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}
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if (direction != Direction.Output)
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{
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throw new NotImplementedException("Input direction is currently not implemented on SDL2 backend!");
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}
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lock (_lock)
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{
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SDL2HardwareDeviceSession session = new SDL2HardwareDeviceSession(this, memoryManager, sampleFormat, sampleRate, channelCount);
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_sessions.Add(session);
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return session;
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}
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}
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internal void Unregister(SDL2HardwareDeviceSession session)
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{
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lock (_lock)
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{
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_sessions.Remove(session);
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}
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}
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private static SDL_AudioSpec GetSDL2Spec(SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount, uint sampleCount)
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{
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return new SDL_AudioSpec
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{
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channels = (byte)requestedChannelCount,
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format = GetSDL2Format(requestedSampleFormat),
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freq = (int)requestedSampleRate,
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samples = (ushort)sampleCount
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};
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}
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internal static ushort GetSDL2Format(SampleFormat format)
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{
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return format switch
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{
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SampleFormat.PcmInt8 => AUDIO_S8,
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SampleFormat.PcmInt16 => AUDIO_S16,
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SampleFormat.PcmInt32 => AUDIO_S32,
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SampleFormat.PcmFloat => AUDIO_F32,
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_ => throw new ArgumentException($"Unsupported sample format {format}"),
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};
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}
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// TODO: Fix this in SDL2-CS.
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[DllImport("SDL2", EntryPoint = "SDL_OpenAudioDevice", CallingConvention = CallingConvention.Cdecl)]
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private static extern uint SDL_OpenAudioDevice_Workaround(
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IntPtr name,
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int iscapture,
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ref SDL_AudioSpec desired,
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out SDL_AudioSpec obtained,
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uint allowed_changes
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);
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internal static uint OpenStream(SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount, uint sampleCount, SDL_AudioCallback callback)
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{
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SDL_AudioSpec desired = GetSDL2Spec(requestedSampleFormat, requestedSampleRate, requestedChannelCount, sampleCount);
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desired.callback = callback;
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uint device = SDL_OpenAudioDevice_Workaround(IntPtr.Zero, 0, ref desired, out SDL_AudioSpec got, 0);
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if (device == 0)
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{
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return 0;
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}
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bool isValid = got.format == desired.format && got.freq == desired.freq && got.channels == desired.channels;
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if (!isValid)
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{
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SDL_CloseAudioDevice(device);
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return 0;
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}
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return device;
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}
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public void Dispose()
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{
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Dispose(true);
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}
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protected virtual void Dispose(bool disposing)
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{
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if (disposing)
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{
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while (_sessions.Count > 0)
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{
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SDL2HardwareDeviceSession session = _sessions[_sessions.Count - 1];
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session.Dispose();
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}
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SDL2Driver.Instance.Dispose();
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}
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}
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public bool SupportsSampleRate(uint sampleRate)
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{
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return true;
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}
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public bool SupportsSampleFormat(SampleFormat sampleFormat)
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{
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return sampleFormat != SampleFormat.PcmInt24;
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}
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public bool SupportsChannelCount(uint channelCount)
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{
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return true;
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}
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public bool SupportsDirection(Direction direction)
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{
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// TODO: add direction input when supported.
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return direction == Direction.Output;
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}
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}
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}
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