/// <summary>
/// Overridden Read function that returns samples processed with SoundTouch. Returns data in same format as
/// WaveChannel32 i.e. stereo float samples.
/// </summary>
/// <param name="buffer">Buffer where to return sample data</param>
/// <param name="offset">Offset from beginning of the buffer</param>
/// <param name="count">Number of bytes to return</param>
/// <returns>Number of bytes copied to buffer</returns>
public override int Read(byte[] buffer, int offset, int count)
{
try
{
// Iterate until enough samples available for output:
// - read samples from input stream
// - put samples to SoundStretch processor
while (st.NumSamples() < count)
{
int nbytes = inputStr.Read(bytebuffer, 0, bytebuffer.Length);
if (nbytes == 0)
{
// end of stream. flush final samples from SoundTouch buffers to output
if (endReached == false)
{
endReached = true; // do only once to avoid continuous flushing
st.Flush();
}
break;
}
// binary copy data from "byte[]" to "float[]" buffer
Buffer.BlockCopy(bytebuffer, 0, floatbuffer, 0, nbytes);
st.PutSamples(floatbuffer, (uint)(nbytes / 8));
}
// ensure that buffer is large enough to receive desired amount of data out
if (floatbuffer.Length < count / 4)
{
floatbuffer = new float[count / 4];
}
// get processed output samples from SoundTouch
int numsamples = (int)st.ReceiveSamples(floatbuffer, (uint)(count / 8));
// binary copy data from "float[]" to "byte[]" buffer
Buffer.BlockCopy(floatbuffer, 0, buffer, offset, numsamples * 8);
return(numsamples * 8); // number of bytes
}
catch (Exception exp)
{
StatusMessage.Write("exception in WaveStreamProcessor.Read: " + exp.Message);
return(0);
}
}