add convert stereo to mono function #96
Description
Hi,
I propose adding function to convert stereo sample to mono, code below. It can be placed inside AudioSample.java I think. It works for me from Processing sketch when called on SoundFile.
To keep only one channel and discard the other:
//this will stop playback if it is playing already
public stereoToMono(int whichChannel){ //whichChannel should be 0 for left and 1 for roght
float[] newBuffer = new float[this.frames()];
if(whichChannel>1){
whichChannel = 1;
}
if(whichChannel<0){
whichChannel = 0;
}
for (int i = 0; i < newBuffer.length; i++) {
newBuffer[i] = this.read(i, whichChannel);//read only left channel
}
this.resize(newBuffer.length, false); //change to mono
this.write(newBuffer); //copy data from single channel into buffer
}
To sum up two channels into one:
//this will stop playback if it is playing already
public stereoToMono(int whichChannel){ //whichChannel should be 0 for left and 1 for roght
float[] newBuffer = new float[this.frames()];
if(whichChannel>1){
whichChannel = 1;
}
if(whichChannel<0){
whichChannel = 0;
}
for (int i = 0; i < newBuffer.length; i++) {
float left = bufferData[i] = sample.read(i, 0);
float right = bufferData[i] = sample.read(i, 1);
newBuffer[i] = (left+right)/2;
}
this.resize(newBuffer.length, false); //change to mono
this.write(newBuffer); //copy data from single channel into buffer
}