Mixing Audio Files in Java

Question

I am creating this program in Java that import X number of Audio files and mix them in 1 audio file.

Example:

Import: "Audio1.wav", "Audio2.wav".
Mix them.
Export: "Result.wav"

Until now i have the import and export methods, my problem is mixing the files into 1 file.

Edit: Some pice of code.

private static File openDialog(){
    JFileChooser open = new JFileChooser();
    int returnVal = open.showOpenDialog(open);
    if (returnVal == JFileChooser.APPROVE_OPTION){
        return open.getSelectedFile();
    }
    return open.getSelectedFile();
}
private static File saveDialog(){
    JFileChooser save = new JFileChooser();
    FileFilter filter = new FileNameExtensionFilter("Audio files", ".wav");
    save.setFileFilter(filter);
    //save.addChoosableFileFilter(new AudioFilter());
    int returnVal = save.showSaveDialog(save);
    if (returnVal == JFileChooser.APPROVE_OPTION){
        return save.getSelectedFile();
    }
    return save.getSelectedFile();
}

private static List<File> importFile(File file){
    files.add(file);
    audioElements();
    return files;
}

This is how I import the files and save the result.

Cool. Did you have a question? ..Any code that shows what you have tried? — Andrew Thompson, Jan 31 '12 at 13:05

Joni · Accepted Answer · 2012-01-31T13:15:29.437

3

Mixing two audio streams can be as easy as taking the sum of the samples, that is

result[i] = audio1[i] + audio2[i];

This is assuming the audio is encoded in LPCM with the same sample size and frequency. If the audio is not LPCM (like µ-law, or A-law) you need a formula that takes the non-linear encoding into account. If the sample sizes are different you have to convert to the same size. If the sample frequencies are different you have to resample.

edited Jan 31 '12 at 13:15

answered Jan 31 '12 at 13:05

Joni

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+1 @Joni Salonen a further suggestion would be using multiplication and division to control the proportion of the mix e.g. in your example this would be 50-50, and you'd need headroom for the result if not the divide the result by 2 – therobyouknow Jan 31 '12 at 13:35
I'm sorry i don't understand how this works. I want to mix for example this: `AudioInputStream clip1 = AudioSystem.getAudioInputStream(files.get(0)); AudioInputStream clip2 = AudioSystem.getAudioInputStream(files.get(1));` – rec Jan 31 '12 at 15:36
i am also facing same problem. http://stackoverflow.com/questions/9908724/how-to-mix-two-pcm-streams-into-single-mp4-file – Sureshkumar Menon Mar 29 '12 at 06:35

Mixing Audio Files in Java

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