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using OpenTK.Audio;
using OpenTK.Audio.OpenAL;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
namespace Ryujinx.Audio.OpenAL
{
public class OpenALAudioOut : IAalOutput
{
private const int MaxTracks = 256;
private const int MaxReleased = 32;
private AudioContext Context;
private class Track : IDisposable
{
public int SourceId { get; private set; }
public int SampleRate { get; private set; }
public ALFormat Format { get; private set; }
public PlaybackState State { get; set; }
private ConcurrentDictionary<long, int> Buffers;
private Queue<long> QueuedTagsQueue;
private Queue<long> ReleasedTagsQueue;
private bool Disposed;
public Track(int SampleRate, ALFormat Format)
{
this.SampleRate = SampleRate;
this.Format = Format;
State = PlaybackState.Stopped;
SourceId = AL.GenSource();
Buffers = new ConcurrentDictionary<long, int>();
QueuedTagsQueue = new Queue<long>();
ReleasedTagsQueue = new Queue<long>();
}
public bool ContainsBuffer(long Tag)
{
SyncQueuedTags();
foreach (long QueuedTag in QueuedTagsQueue)
{
if (QueuedTag == Tag)
{
return true;
}
}
return false;
}
public long[] GetReleasedBuffers(int MaxCount)
{
ClearReleased();
List<long> Tags = new List<long>();
HashSet<long> Unique = new HashSet<long>();
while (MaxCount-- > 0 && ReleasedTagsQueue.TryDequeue(out long Tag))
{
if (Unique.Add(Tag))
{
Tags.Add(Tag);
}
}
return Tags.ToArray();
}
public int AppendBuffer(long Tag)
{
if (Disposed)
{
throw new ObjectDisposedException(nameof(Track));
}
int Id = AL.GenBuffer();
Buffers.AddOrUpdate(Tag, Id, (Key, OldId) =>
{
AL.DeleteBuffer(OldId);
return Id;
});
QueuedTagsQueue.Enqueue(Tag);
return Id;
}
public void ClearReleased()
{
SyncQueuedTags();
AL.GetSource(SourceId, ALGetSourcei.BuffersProcessed, out int ReleasedCount);
if (ReleasedCount > 0)
{
AL.SourceUnqueueBuffers(SourceId, ReleasedCount);
}
}
private void SyncQueuedTags()
{
AL.GetSource(SourceId, ALGetSourcei.BuffersQueued, out int QueuedCount);
AL.GetSource(SourceId, ALGetSourcei.BuffersProcessed, out int ReleasedCount);
QueuedCount -= ReleasedCount;
while (QueuedTagsQueue.Count > QueuedCount)
{
ReleasedTagsQueue.Enqueue(QueuedTagsQueue.Dequeue());
}
while (ReleasedTagsQueue.Count > MaxReleased)
{
ReleasedTagsQueue.Dequeue();
}
}
public void Dispose()
{
Dispose(true);
}
protected virtual void Dispose(bool Disposing)
{
if (Disposing && !Disposed)
{
Disposed = true;
AL.DeleteSource(SourceId);
foreach (int Id in Buffers.Values)
{
AL.DeleteBuffer(Id);
}
}
}
}
private ConcurrentDictionary<int, Track> Tracks;
public OpenALAudioOut()
{
Context = new AudioContext();
Tracks = new ConcurrentDictionary<int, Track>();
}
public int OpenTrack(int SampleRate, int Channels, out AudioFormat Format)
{
Format = AudioFormat.PcmInt16;
Track Td = new Track(SampleRate, GetALFormat(Channels, Format));
for (int Id = 0; Id < MaxTracks; Id++)
{
if (Tracks.TryAdd(Id, Td))
{
return Id;
}
}
return -1;
}
private ALFormat GetALFormat(int Channels, AudioFormat Format)
{
if (Channels < 1 || Channels > 2)
{
throw new ArgumentOutOfRangeException(nameof(Channels));
}
if (Channels == 1)
{
switch (Format)
{
case AudioFormat.PcmInt8: return ALFormat.Mono8;
case AudioFormat.PcmInt16: return ALFormat.Mono16;
}
}
else /* if (Channels == 2) */
{
switch (Format)
{
case AudioFormat.PcmInt8: return ALFormat.Stereo8;
case AudioFormat.PcmInt16: return ALFormat.Stereo16;
}
}
throw new ArgumentException(nameof(Format));
}
public void CloseTrack(int Track)
{
if (Tracks.TryRemove(Track, out Track Td))
{
Td.Dispose();
}
}
public bool ContainsBuffer(int Track, long Tag)
{
if (Tracks.TryGetValue(Track, out Track Td))
{
return Td.ContainsBuffer(Tag);
}
return false;
}
public long[] GetReleasedBuffers(int Track, int MaxCount)
{
if (Tracks.TryGetValue(Track, out Track Td))
{
return Td.GetReleasedBuffers(MaxCount);
}
return null;
}
public void AppendBuffer(int Track, long Tag, byte[] Buffer)
{
if (Tracks.TryGetValue(Track, out Track Td))
{
int BufferId = Td.AppendBuffer(Tag);
AL.BufferData(BufferId, Td.Format, Buffer, Buffer.Length, Td.SampleRate);
AL.SourceQueueBuffer(Td.SourceId, BufferId);
StartPlaybackIfNeeded(Td);
}
}
public void Start(int Track)
{
if (Tracks.TryGetValue(Track, out Track Td))
{
Td.State = PlaybackState.Playing;
StartPlaybackIfNeeded(Td);
}
}
private void StartPlaybackIfNeeded(Track Td)
{
AL.GetSource(Td.SourceId, ALGetSourcei.SourceState, out int StateInt);
ALSourceState State = (ALSourceState)StateInt;
if (State != ALSourceState.Playing && Td.State == PlaybackState.Playing)
{
Td.ClearReleased();
AL.SourcePlay(Td.SourceId);
}
}
public void Stop(int Track)
{
if (Tracks.TryGetValue(Track, out Track Td))
{
Td.State = PlaybackState.Stopped;
AL.SourceStop(Td.SourceId);
}
}
public PlaybackState GetState(int Track)
{
if (Tracks.TryGetValue(Track, out Track Td))
{
return Td.State;
}
return PlaybackState.Stopped;
}
}
}
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