core.be.tarsos.dsp.synthesis.AmplitudeLFO Maven / Gradle / Ivy
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/*
* _______ _____ _____ _____
* |__ __| | __ \ / ____| __ \
* | | __ _ _ __ ___ ___ ___| | | | (___ | |__) |
* | |/ _` | '__/ __|/ _ \/ __| | | |\___ \| ___/
* | | (_| | | \__ \ (_) \__ \ |__| |____) | |
* |_|\__,_|_| |___/\___/|___/_____/|_____/|_|
*
* -------------------------------------------------------------
*
* 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.synthesis;
import be.tarsos.dsp.AudioEvent;
import be.tarsos.dsp.AudioProcessor;
public class AmplitudeLFO implements AudioProcessor {
private double frequency;
private double scaleParameter;
private double phase;
public AmplitudeLFO(){
this(1.5,0.75);
}
public AmplitudeLFO(double frequency, double scaleParameter){
this.frequency = frequency;
this.scaleParameter = scaleParameter;
phase = 0;
}
@Override
public boolean process(AudioEvent audioEvent) {
float[] buffer = audioEvent.getFloatBuffer();
double sampleRate = audioEvent.getSampleRate();
double twoPiF = 2 * Math.PI * frequency;
double time = 0;
for(int i = 0 ; i < buffer.length ; i++){
time = i / sampleRate;
float gain = (float) (scaleParameter * Math.sin(twoPiF * time + phase));
buffer[i] = gain * buffer[i];
}
phase = twoPiF * buffer.length / sampleRate + phase;
return true;
}
@Override
public void processingFinished() {
}
}