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Ryujinx/Ryujinx.Audio.Backends.OpenAL/OpenALHardwareDeviceDriver.cs

184 lines
5.1 KiB
C#

using OpenTK.Audio.OpenAL;
using Ryujinx.Audio.Common;
using Ryujinx.Audio.Integration;
using Ryujinx.Memory;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
namespace Ryujinx.Audio.Backends.OpenAL
{
public class OpenALHardwareDeviceDriver : IHardwareDeviceDriver
{
private object _lock = new object();
private ALDevice _device;
private ALContext _context;
private ManualResetEvent _updateRequiredEvent;
private List<OpenALHardwareDeviceSession> _sessions;
private bool _stillRunning;
private Thread _updaterThread;
public OpenALHardwareDeviceDriver()
{
_device = ALC.OpenDevice("");
_context = ALC.CreateContext(_device, new ALContextAttributes());
_updateRequiredEvent = new ManualResetEvent(false);
_sessions = new List<OpenALHardwareDeviceSession>();
_stillRunning = true;
_updaterThread = new Thread(Update)
{
Name = "HardwareDeviceDriver.OpenAL"
};
_updaterThread.Start();
}
public static bool IsSupported
{
get
{
try
{
return ALC.GetStringList(GetEnumerationStringList.DeviceSpecifier).Any();
}
catch
{
return false;
}
}
}
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 ArgumentException($"{direction}");
}
else if (!SupportsChannelCount(channelCount))
{
throw new ArgumentException($"{channelCount}");
}
lock (_lock)
{
OpenALHardwareDeviceSession session = new OpenALHardwareDeviceSession(this, memoryManager, sampleFormat, sampleRate, channelCount);
_sessions.Add(session);
return session;
}
}
internal void Unregister(OpenALHardwareDeviceSession session)
{
lock (_lock)
{
_sessions.Remove(session);
}
}
public ManualResetEvent GetUpdateRequiredEvent()
{
return _updateRequiredEvent;
}
private void Update()
{
ALC.MakeContextCurrent(_context);
while (_stillRunning)
{
bool updateRequired = false;
lock (_lock)
{
foreach (OpenALHardwareDeviceSession session in _sessions)
{
if (session.Update())
{
updateRequired = true;
}
}
}
if (updateRequired)
{
_updateRequiredEvent.Set();
}
// If it's not slept it will waste cycles.
Thread.Sleep(10);
}
}
public void Dispose()
{
Dispose(true);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
_stillRunning = false;
int sessionCount = 0;
// NOTE: This is done in a way to avoid possible situations when the OpenALHardwareDeviceSession is already being dispose in another thread but doesn't hold the lock and tries to Unregister.
do
{
lock (_lock)
{
if (_sessions.Count == 0)
{
break;
}
OpenALHardwareDeviceSession session = _sessions[_sessions.Count - 1];
session.Dispose();
sessionCount = _sessions.Count;
}
}
while (sessionCount > 0);
ALC.DestroyContext(_context);
ALC.CloseDevice(_device);
}
}
public bool SupportsSampleRate(uint sampleRate)
{
return true;
}
public bool SupportsSampleFormat(SampleFormat sampleFormat)
{
return true;
}
public bool SupportsChannelCount(uint channelCount)
{
return channelCount == 1 || channelCount == 2 || channelCount == 6;
}
public bool SupportsDirection(Direction direction)
{
return direction == Direction.Output;
}
}
}