/// <summary>
/// Fills the buffer.
/// </summary>
/// <param name="target">The OpenALDataBuffer.</param>
private void FillBuffer(OpenALDataBuffer target)
{
lock (_locker)
{
var unqueueBuffer = new uint[1];
OpenAL.alSourceUnqueueBuffers(_source.SourceId, 1, unqueueBuffer);
var data = new byte[_bufferSize];
var datalength = _bufferSize;
if (_bufferSize > _audioData.Length - _processedBytes)
{
Buffer.BlockCopy(_audioData, _processedBytes, data, 0, _audioData.Length - _processedBytes);
datalength = _audioData.Length - _processedBytes;
_processedBytes += datalength;
}
else
{
Buffer.BlockCopy(_audioData, _processedBytes, data, 0, _bufferSize);
_processedBytes += _bufferSize;
}
_audioMixer.ApplyEffects(data, WaveFormat);
OpenAL.alBufferData(target.Id, Format, data, datalength, SampleRate);
OpenAL.alSourceQueueBuffers(_source.SourceId, 1, new[] { target.Id });
}
}
/// <summary>
/// Fills the buffer.
/// </summary>
/// <param name="target">The OpenALDataBuffer.</param>
private void FillBuffer(OpenALDataBuffer target)
{
lock (_locker)
{
var unqueueBuffer = new uint[1];
OpenAL.alSourceUnqueueBuffers(_source.SourceId, 1, unqueueBuffer);
var data = new byte[_bufferSize];
var datalength = _bufferSize;
if (_bufferSize > _audioData.Length - _processedBytes)
{
Buffer.BlockCopy(_audioData, _processedBytes, data, 0, _audioData.Length - _processedBytes);
datalength = _audioData.Length - _processedBytes;
_processedBytes += datalength;
}
else
{
Buffer.BlockCopy(_audioData, _processedBytes, data, 0, _bufferSize);
_processedBytes += _bufferSize;
}
_audioMixer.ApplyEffects(data, WaveFormat);
OpenAL.alBufferData(target.Id, Format, data, datalength, SampleRate);
OpenAL.alSourceQueueBuffers(_source.SourceId, 1, new[] {target.Id});
}
}
/// <summary>
/// Starts the playback.
/// </summary>
private void StartPlayback()
{
if (PlaybackState == PlaybackState.Stopped)
{
PlaybackState = PlaybackState.Playing;
RaisePlaybackChanged();
_processedBytes = 0;
_playbackThread = new Task(() =>
{
OpenALDataBuffer buffer1;
OpenALDataBuffer buffer2;
OpenALDataBuffer buffer3;
lock (_locker)
{
Owner.Context.MakeCurrent();
buffer1 = OpenALDataBuffer.CreateBuffer();
buffer2 = OpenALDataBuffer.CreateBuffer();
buffer3 = OpenALDataBuffer.CreateBuffer();
}
buffer1.Next = buffer2;
buffer2.Next = buffer3;
buffer3.Next = buffer1;
OpenALDataBuffer currentBuffer = buffer1;
FillBuffer(currentBuffer);
currentBuffer = currentBuffer.Next;
FillBuffer(currentBuffer);
currentBuffer = currentBuffer.Next;
FillBuffer(currentBuffer);
lock (_locker)
{
OpenAL.alSourcePlay(_source.SourceId);
}
while (_processedBytes < _audioData.Length)
{
if (_beginDispose)
{
return;
}
switch (PlaybackState)
{
case PlaybackState.Paused:
_playbackThread.Wait(Latency);
continue;
case PlaybackState.Stopped:
return;
}
int finishedBuffers;
lock (_locker)
{
OpenAL.alGetSourcei(_source.SourceId, SourceProperty.AllBuffersProcessed,
out finishedBuffers);
}
if (finishedBuffers == 0)
{
_playbackThread.Wait(Latency);
}
while (finishedBuffers > 0)
{
finishedBuffers--;
currentBuffer = currentBuffer.Next;
FillBuffer(currentBuffer);
}
Position = _processedBytes / WaveFormat.AvgBytesPerSec * 1000;
//if the audio stops where it should not, restart playback
lock (_locker)
{
int sourceState;
OpenAL.alGetSourcei(_source.SourceId, SourceProperty.SourceState, out sourceState);
if ((SourceState)sourceState == SourceState.Stopped)
{
OpenAL.alSourcePlay(_source.SourceId);
}
}
}
PlaybackState = PlaybackState.Stopped;
var queuedBuffers = new uint[3];
RaisePlaybackChanged();
lock (_locker)
{
OpenAL.alSourceUnqueueBuffers(_source.SourceId, 3, queuedBuffers);
OpenAL.alDeleteBuffers(3, queuedBuffers);
}
});
_playbackThread.Start();
}
}
