public void Read(T[] outBuf, int outChannels, int outSampleRate)
{
lock (this)
{
if (this.started)
{
int outPos = 0;
// enough data in remaining frames to fill entire out buffer
// framesElemRem / this.sampleRate >= outElemRem / outSampleRate
while ((this.frameQueue.Count * this.frameSamples - this.curPlayingFrameSamplePos) * this.channels * outSampleRate >= (outBuf.Length - outPos) * this.sampleRate)
{
int playingFramePos = this.curPlayingFrameSamplePos * this.channels;
var frame = frameQueue.Peek();
int outElemRem = outBuf.Length - outPos;
int frameElemRem = frame.Length - playingFramePos;
// enough data in the current frame to fill entire out buffer and some will remain for the next call: keeping this frame
// frameElemRem / (frCh * frRate) > outElemRem / (outCh * outRate)
if (frameElemRem * outChannels * outSampleRate > outElemRem * this.channels * this.sampleRate)
{
// frame remainder is large enough to fill outBuf remainder, keep this frame and return
//int framePosDelta = this.channels * outChannels * this.sampleRate / (outElemRem * outSampleRate);
int framePosDelta = outElemRem * this.channels * this.sampleRate / (outChannels * outSampleRate);
if (this.sampleRate == outSampleRate && this.channels == outChannels)
{
System.Buffer.BlockCopy(frame, playingFramePos * elementSize, outBuf, outPos * elementSize, outElemRem * elementSize);
}
else
{
AudioUtil.Resample(frame, playingFramePos, framePosDelta, this.channels, outBuf, outPos, outElemRem, outChannels);
}
this.curPlayingFrameSamplePos += framePosDelta / this.channels;
return;
}
// discarding current frame because it fills exactly out buffer or next frame required to do so
else
{
int outPosDelta = frameElemRem * outChannels * outSampleRate / (this.channels * this.sampleRate);
if (this.sampleRate == outSampleRate && this.channels == outChannels)
{
System.Buffer.BlockCopy(frame, playingFramePos * elementSize, outBuf, outPos * elementSize, frameElemRem * elementSize);
}
else
{
AudioUtil.Resample(frame, playingFramePos, frameElemRem, this.channels, outBuf, outPos, outPosDelta, outChannels);
}
outPos += outPosDelta;
this.curPlayingFrameSamplePos = 0;
dequeueFrameQueue();
if (outPosDelta == outElemRem)
{
return;
}
}
}
}
}
}
public T[] Process(T[] buf)
{
AudioUtil.Resample(buf, this.frameResampled, this.frameResampled.Length, channels);
return(this.frameResampled);
}