public override int Read(float[] buffer, int offset, int count)
{
var playbackState = this.playbackToken.State;
if (playbackState == PlaybackState.StopRequested)
{
this.playbackToken.State = PlaybackState.Stopped;
return(0);
}
var source = this.audioData.Data;
if (source == null)
{
return(0);
}
float volume = this.audioData.Volume * this.volume * this.masterVolumeProvider.MasterVolume;
long availableSamples = source.Length - position;
long samplesToCopy = Math.Min(availableSamples, count);
if (AudioPlayer.EqualsVolume(volume, 0.0f))
{
Array.Clear(buffer, offset, (int)samplesToCopy);
}
else if (AudioPlayer.EqualsVolume(volume, 1.0f))
{
Array.Copy(source, position, buffer, offset, samplesToCopy);
}
else
{
if (!this.useParallel)
{
for (long i = 0; i < samplesToCopy; i++)
{
buffer[offset + i] = source[position + i] * volume;
}
}
else
{
Parallel.For(0, samplesToCopy,
(i) =>
{
buffer[offset + i] = source[position + i] * volume;
});
}
}
position += samplesToCopy;
// If loop mode is enabled, remaining area of buffer is zero filled.
// This is a reasonable way, but there may be a very small difference according to source audio data.
if (playbackState == PlaybackState.PlayingInLoop)
{
if (position >= source.Length)
{
position = 0;
this.playbackToken.IncrementLoopCount();
}
int toBeFilled = (int)(count - samplesToCopy);
if (toBeFilled > 0)
{
Array.Clear(buffer, (int)(offset + samplesToCopy), toBeFilled);
}
samplesToCopy = count;
}
else if (samplesToCopy < count)
{
this.playbackToken.State = PlaybackState.Stopped;
}
return((int)samplesToCopy);
}
