mixing two audio file using mixer

Question

how can i mix two audio files into one file so that the resultant file can play two files simultaneously? please help.. here what i am doing is that i am taking two files and concat them into another file.. but i want the file to be played simultaneously..

    private void saveAudio1() {
    try {                                      

        AudioInputStream clip1 = AudioSystem.getAudioInputStream(file1);
        AudioInputStream clip2 = AudioSystem.getAudioInputStream(file2);
        Collection list=new ArrayList();

        AudioInputStream appendedFiles =
                new AudioInputStream(
                new SequenceInputStream(clip1, clip2),
                clip1.getFormat(),
                clip1.getFrameLength() + clip2.getFrameLength());
        if (dlgOpenFile == null) {
            dlgOpenFile = new FileDialog(this, "Save As...", FileDialog.SAVE);
        }
        if (cfgJMApps != null) {
            nameFile = cfgJMApps.getLastOpenFile();
        }
        if (nameFile != null) {
            dlgOpenFile.setFile(nameFile);
        }

        dlgOpenFile.show();
        nameFile = dlgOpenFile.getFile();
        if (nameFile == null) {
            return;
        }

        nameFile = dlgOpenFile.getDirectory() + nameFile;
        if (cfgJMApps != null) {
            cfgJMApps.setLastOpenFile(nameFile);
        }


        AudioSystem.write(appendedFiles,
                AudioFileFormat.Type.WAVE,
                new File(nameFile));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 1

I just found a link http://www.jsresources.org/examples/AudioConcat.html

It seems like he is doing it.. The source code can be found on the page! Hope this helps you out.

Answer 2

what @Vossi said is true. Use jresources.org to help use. You could use their example: http://www.jsresources.org/examples/MixingAudioInputStream.java.html. For the org.tritonus.share.sampled.TConversionTool package, if you have problems using their library, then download their source code: it's open source, and try using it. I tried it and it worked for me :D http://sourceforge.net/projects/tritonus/files/ I'm grateful for those guys!

Answer 3

You need to read sample by sample from both streams, perfrom addition of those samples (be carefull of overflow) and then store new added sample to new AudioInputStream. Check here to see how to convert OutputStream to InputStream, when you'll be able to make another AudioInputStream and save your audio file.

Answer 4

Here is a class I made :

class MixedSound extends Thread {
    protected AudioFormat format; //Both streams must have same format
    protected AudioInputStream sound1;
    protected AudioInputStream sound2;
    protected static SourceDataLine ausgabe;
    protected DataLine.Info data;

    public MixedSound(String path1, String path2) {
        try {
        sound1 = AudioSystem.getAudioInputStream(new File(path1));
        sound2 = AudioSystem.getAudioInputStream(new File(path2));
        format=sound1.getFormat(); //I assume both streams have same format
        data=new DataLine.Info(SourceDataLine.class,format);
        ausgabe=(SourceDataLine) AudioSystem.getLine(data);
        } catch (UnsupportedAudioFileException | IOException | LineUnavailableException bug) {
            System.err.println(bug);
        }
    }
    public synchronized void play() throws IOException, LineUnavailableException {
        ausgabe.open(format,1024);
        ausgabe.start();
        byte[] buffer1=new byte[1024];
        byte[] buffer2=new byte[1024];
        byte[] mixed=new byte[1024];
        int bytes_sound1=sound1.read(buffer1,0,buffer1.length);
        int bytes_sound2=sound2.read(buffer2,0,buffer2.length);
        while (bytes_sound1 != -1 || bytes_sound2 != -1) {
            for (int i=0; i < mixed.length; i++) {
                mixed[i]=(byte)Math.min(0.999f,((float)buffer1[i]+(float)buffer2[i])); //Mix them
            }
            ausgabe.write(mixed, 0, Math.max(bytes_sound1, bytes_sound2));
            buffer1=new byte[1024]; //Clean buffer
            buffer2=new byte[1024]; //Clean buffer
            bytes_sound1=sound1.read(buffer1,0,buffer1.length);
            bytes_sound2=sound2.read(buffer2,0,buffer2.length);
        }
        ausgabe.drain();
        ausgabe.close();
    }
    @Override
    public synchronized void run() {
        try {
            play();
        } catch (IOException | LineUnavailableException ex) {
            System.err.println(ex);
        }
    }
}

It mixes two sounds by adding their volumes.

Use it like that :

MixedSound sound=new Sound("sound1.wav","sound2.wav");
sound.start(); //Play it
System.out.println("Started playing sound"); //Do stuff at same time

Hope it helps.