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Cogchar Sonograph - experimental/imported audio display code
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/*
* Copyright 2011 by The Cogchar Project (www.cogchar.org).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.cogchar.audio.processing;
import org.apache.commons.math3.complex.Complex;
import org.apache.commons.math3.transform.FastFourierTransformer;
import org.apache.commons.math3.transform.DftNormalization;
import org.apache.commons.math3.transform.TransformType;
/**
*
* @author Matthew Stevenson
*/
public class FFTBuffer {
private MeanCalculator myMean;
private FFTWindow myWindow;
private Complex[][] myFFTData;
private int mySize;
private int myChannels;
private boolean myRealitime;
public FFTBuffer(int channels, int size, MeanCalculator mean, FFTWindow win, boolean realtime){
myRealitime = realtime;
myChannels = channels;
myMean = mean;
myWindow = win;
mySize = size;
myFFTData = new Complex[myChannels][mySize];
}
public void writeData(double[][] data){
boolean normalize = myMean != null;
boolean window = myWindow != null;
if(myRealitime && window){
myMean.addSamples(data);
}
for(int c=0; c