public int Read(float[] buffer, int offset, int count)
{
if (playbackRate == 0) // play silence
{
for (int n = 0; n < count; n++)
{
buffer[offset++] = 0;
}
return(count);
}
if (repositionRequested)
{
soundTouch.Clear();
repositionRequested = false;
}
int samplesRead = 0;
bool reachedEndOfSource = false;
while (samplesRead < count)
{
if (soundTouch.NumberOfSamplesAvailable == 0)
{
var readFromSource = sourceProvider.Read(sourceReadBuffer, 0, sourceReadBuffer.Length);
if (readFromSource > 0)
{
soundTouch.PutSamples(sourceReadBuffer, readFromSource / channelCount);
}
else
{
reachedEndOfSource = true;
// we've reached the end, tell SoundTouch we're done
soundTouch.Flush();
}
}
var desiredSampleFrames = (count - samplesRead) / channelCount;
var received = soundTouch.ReceiveSamples(soundTouchReadBuffer, desiredSampleFrames) * channelCount;
// use loop instead of Array.Copy due to WaveBuffer
for (int n = 0; n < received; n++)
{
buffer[offset + samplesRead++] = soundTouchReadBuffer[n];
}
if (received == 0 && reachedEndOfSource)
{
break;
}
}
if (reachedEndOfSource && !endNotified)
{
PlaybackEnded.Invoke(this, new StoppedEventArgs());
endNotified = true;
}
return(samplesRead);
}
private void Process(SoundTouch <TSampleType, TLongSampleType> pSoundTouch, WavInFile inFile, WavOutFile outFile)
{
int nSamples;
var sampleBuffer = new TSampleType[BUFF_SIZE];
if ((inFile == null) || (outFile == null))
{
return; // nothing to do.
}
int nChannels = inFile.GetNumChannels();
int buffSizeSamples = BUFF_SIZE / nChannels;
// Process samples read from the input file
while (!inFile.Eof())
{
// Read a chunk of samples from the input file
int num = inFile.Read(sampleBuffer, BUFF_SIZE);
nSamples = num / inFile.GetNumChannels();
// Feed the samples into SoundTouch processor
pSoundTouch.PutSamples(sampleBuffer, nSamples);
do
{
nSamples = pSoundTouch.ReceiveSamples(sampleBuffer, buffSizeSamples);
outFile.Write(sampleBuffer, nSamples * nChannels);
} while (nSamples != 0);
}
// Now the input file is processed, yet 'flush' few last samples that are
// hiding in the SoundTouch's internal processing pipeline.
pSoundTouch.Flush();
do
{
nSamples = pSoundTouch.ReceiveSamples(sampleBuffer, buffSizeSamples);
outFile.Write(sampleBuffer, nSamples * nChannels);
} while (nSamples != 0);
}