Write Audio to File

[Anonymous]

Hi

I am trying to write audio to file using the JavaSoundAudioGrabber. However, not being very sucessfull. I have the following code:

final JavaSoundAudioGrabber xa = new JavaSoundAudioGrabber(new AudioFormat(16, 44.1, 1));
xa.setMaxBufferSize(this.sampleChunkSize);

    // get the audio format
    audioFormatXa = new javax.sound.sampled.AudioFormat(
            (int)xa.getFormat().getSampleRateKHz() * 1000, xa
                    .getFormat().getNBits(), xa.getFormat()
                    .getNumChannels(), xa.getFormat().isSigned(), xa
                    .getFormat().isBigEndian());

    new Thread(xa).start();

    // Hanning processor on top of the main audio stream
    final HanningAudioProcessor g =
            new HanningAudioProcessor(xa, this.img.getWidth() * xa.getFormat().getNumChannels())
        {
            @Override
            public SampleChunk processSamples(final SampleChunk sample)
            {
                AudioCapture.this.updateProcessor(sample);
                return sample;
            }
        };

    System.out.println("Using audio stream: " + g.getFormat());

    try {
        Thread.sleep(500);
        SampleChunk s = null;       
        while ((s = g.nextSampleChunk()) != null)   {
                    this.currentAudioBuffer.append(s); 
               // do other processing here 
         }

I then write the currentAudioBuffer later using :

   final byte[] rawBytes = currentAudioBuffer.getSamplesAsByteBuffer().array();
  ByteArrayInputStream bais = new ByteArrayInputStream(rawBytes);

//audioFormatXa is taken from the JavaSoundAudioGrabber instance earlier not shown above.

long length = (long)(rawBytes.length  / audioFormatXa.getFrameSize());

AudioInputStream audioInputStreamTemp = new AudioInputStream(bais,audioFormatXa,length);

AudioSystem.write(
                audioInputStreamTemp
                ,AudioFileFormat.Type.WAVE
                ,new File("testfile.wav"));

However, I just get noise in the file ? any pointers would be usefull

Thanks in advance

[David Dupplaw]

Whenever that happened to me it was usually a big-endian/little-endian problem. You're capturing 16bit samples and writing them as 8 bit value so you need to make sure the bytes are in the right order. The format should do that for you, but maybe there's a problem there? Perhaps check that the byte array contains the expected values before you write it and that the wave file contains those values in its data block?

[Anonymous]