How to convert a byte array into an AudioInputStream in Java

Question

I want to convert a byte array into an AudioInputStream. The byte array was filled from a *.wav file before. I have the following code:

    public static AudioInputStream writeBytesBackToStream(byte[] bytes) {
    ByteArrayInputStream baiut = new ByteArrayInputStream(bytes);
    AudioInputStream stream = null;
    try {
        stream = AudioSystem.getAudioInputStream(baiut);
    } catch (UnsupportedAudioFileException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    if(stream.equals(null) || stream == null) {
        System.out.println("WARNING: Stream read by byte array is null!");
    }
    return stream;
}

Now I only want to convert this byte array into an AudioInputStream, but an UnsupportedAudioFileException is thrown:

javax.sound.sampled.UnsupportedAudioFileException: could not get audio input stream from    input stream

Has anyone got an idea?

Use this to confirm that it supports wav file, and also test passing the wav FIle to the getAudioInputStream... so you can check if the problem is with the bytearray or the file itseld — fmodos
Can you post the wav file loading code to check that your byte array is correct? — gma
I believe Durandel's answer is correct, but reading this primer may help: blog.bjornroche.com/2013/05/… — Bjorn Roche

matt matt · Accepted Answer · 2016-05-12T08:08:27

Another way to do this, if the data is actually PCM, is to set the AudioFormat parameters manually. Here is an example to create an A minor.

    byte[] b = new byte[64000];
    //lets make a 440hz tone for 1s at 32kbps, and 523.25hz.
    for(int i = 0; i<b.length/2; i++){

        b[i*2+1] = (byte)(127*Math.sin(4*Math.PI*440.0/b.length*i));
        b[i*2]  = (byte)(127*Math.sin(4*Math.PI*523.25/b.length*i));
    }

    AudioInputStream stream = new AudioInputStream(
        new ByteArrayInputStream(b), 
        new AudioFormat(16000, 8, 2, true, false), 
        64000
    );

Also be careful if you're making bytes into sounds and you have earphones in.

How to convert a byte array into an AudioInputStream in Java

2 Answers