/*
* _______ _____ _____ _____
* |__ __| | __ \ / ____| __ \
* | | __ _ _ __ ___ ___ ___| | | | (___ | |__) |
* | |/ _` | '__/ __|/ _ \/ __| | | |\___ \| ___/
* | | (_| | | \__ \ (_) \__ \ |__| |____) | |
* |_|\__,_|_| |___/\___/|___/_____/|_____/|_|
*
* -------------------------------------------------------------
*
* TarsosDSP is developed by Joren Six at IPEM, University Ghent
*
* -------------------------------------------------------------
*
* Info: http://0110.be/tag/TarsosDSP
* Github: https://github.com/JorenSix/TarsosDSP
* Releases: http://0110.be/releases/TarsosDSP/
*
* TarsosDSP includes modified source code by various authors,
* for credits and info, see README.
*
*/
package be.tarsos.dsp.resample;
import be.tarsos.dsp.AudioDispatcher;
import be.tarsos.dsp.AudioEvent;
import be.tarsos.dsp.AudioProcessor;
/**
* Currently not working sample rate transposer, works only for integer factors.
* Changes sample rate by using linear interpolation.
*
* Together with the time stretcher this can be used for pitch shifting.
* @author Joren Six
* @author Olli Parviainen
*/
public class SoundTouchRateTransposer implements AudioProcessor {
private double rate;
int slopeCount;
double prevSample;
private AudioDispatcher dispatcher;
public void setDispatcher(AudioDispatcher newDispatcher){
this.dispatcher = newDispatcher;
}
public SoundTouchRateTransposer(double d){
this.rate = d;
}
@Override
public boolean process(AudioEvent audioEvent) {
int i, used;
float[] src = audioEvent.getFloatBuffer();
float[] dest = new float[(int) Math.round(audioEvent.getBufferSize() / rate)];
used = 0;
i = 0;
// Process the last sample saved from the previous call first...
while (slopeCount <= 1.0f) {
dest[i] = (float)((1.0f - slopeCount) * prevSample + slopeCount * src[0]);
i++;
slopeCount += rate;
}
slopeCount -= 1.0f;
end:
while(true){
while (slopeCount > 1.0f) {
slopeCount -= 1.0f;
used++;
if (used >= src.length - 1)
break end;
}
if(i < dest.length){
dest[i] = (float)((1.0f - slopeCount) * src[used] + slopeCount * src[used + 1]);
}
i++;
slopeCount += rate;
}
//Store the last sample for the next round
prevSample = src[src.length - 1];
dispatcher.setStepSizeAndOverlap(dest.length, 0);
audioEvent.setFloatBuffer(dest);
return true;
}
@Override
public void processingFinished() {
}
}