R/Ryujinx.Audio.Backends.SDL2/SDL2HardwareDeviceDriver.cs
Mary eb056218a1
audio: Implement a SDL2 backend (#2258)
* 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
2021-05-05 23:37:09 +02:00

184 lines
5.5 KiB
C#

using Ryujinx.Audio.Backends.Common;
using Ryujinx.Audio.Common;
using Ryujinx.Audio.Integration;
using Ryujinx.Memory;
using Ryujinx.SDL2.Common;
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Threading;
using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
using static SDL2.SDL;
namespace Ryujinx.Audio.Backends.SDL2
{
public class SDL2HardwareDeviceDriver : IHardwareDeviceDriver
{
private object _lock = new object();
private ManualResetEvent _updateRequiredEvent;
private List<SDL2HardwareDeviceSession> _sessions;
public SDL2HardwareDeviceDriver()
{
_updateRequiredEvent = new ManualResetEvent(false);
_sessions = new List<SDL2HardwareDeviceSession>();
SDL2Driver.Instance.Initialize();
}
public static bool IsSupported => IsSupportedInternal();
private static bool IsSupportedInternal()
{
uint device = OpenStream(SampleFormat.PcmInt16, Constants.TargetSampleRate, Constants.ChannelCountMax, Constants.TargetSampleCount, null);
if (device != 0)
{
SDL_CloseAudioDevice(device);
}
return device != 0;
}
public ManualResetEvent GetUpdateRequiredEvent()
{
return _updateRequiredEvent;
}
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 SDL2 backend!");
}
lock (_lock)
{
SDL2HardwareDeviceSession session = new SDL2HardwareDeviceSession(this, memoryManager, sampleFormat, sampleRate, channelCount);
_sessions.Add(session);
return session;
}
}
internal void Unregister(SDL2HardwareDeviceSession session)
{
lock (_lock)
{
_sessions.Remove(session);
}
}
private static SDL_AudioSpec GetSDL2Spec(SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount, uint sampleCount)
{
return new SDL_AudioSpec
{
channels = (byte)requestedChannelCount,
format = GetSDL2Format(requestedSampleFormat),
freq = (int)requestedSampleRate,
samples = (ushort)sampleCount
};
}
internal static ushort GetSDL2Format(SampleFormat format)
{
return format switch
{
SampleFormat.PcmInt8 => AUDIO_S8,
SampleFormat.PcmInt16 => AUDIO_S16,
SampleFormat.PcmInt32 => AUDIO_S32,
SampleFormat.PcmFloat => AUDIO_F32,
_ => throw new ArgumentException($"Unsupported sample format {format}"),
};
}
// TODO: Fix this in SDL2-CS.
[DllImport("SDL2", EntryPoint = "SDL_OpenAudioDevice", CallingConvention = CallingConvention.Cdecl)]
private static extern uint SDL_OpenAudioDevice_Workaround(
IntPtr name,
int iscapture,
ref SDL_AudioSpec desired,
out SDL_AudioSpec obtained,
uint allowed_changes
);
internal static uint OpenStream(SampleFormat requestedSampleFormat, uint requestedSampleRate, uint requestedChannelCount, uint sampleCount, SDL_AudioCallback callback)
{
SDL_AudioSpec desired = GetSDL2Spec(requestedSampleFormat, requestedSampleRate, requestedChannelCount, sampleCount);
desired.callback = callback;
uint device = SDL_OpenAudioDevice_Workaround(IntPtr.Zero, 0, ref desired, out SDL_AudioSpec got, 0);
if (device == 0)
{
return 0;
}
bool isValid = got.format == desired.format && got.freq == desired.freq && got.channels == desired.channels;
if (!isValid)
{
SDL_CloseAudioDevice(device);
return 0;
}
return device;
}
public void Dispose()
{
Dispose(true);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
while (_sessions.Count > 0)
{
SDL2HardwareDeviceSession session = _sessions[_sessions.Count - 1];
session.Dispose();
}
SDL2Driver.Instance.Dispose();
}
}
public bool SupportsSampleRate(uint sampleRate)
{
return true;
}
public bool SupportsSampleFormat(SampleFormat sampleFormat)
{
return sampleFormat != SampleFormat.PcmInt24;
}
public bool SupportsChannelCount(uint channelCount)
{
return true;
}
public bool SupportsDirection(Direction direction)
{
// TODO: add direction input when supported.
return direction == Direction.Output;
}
}
}