[SOLVED] TarsosDSP Android applying lowpass filter and saving to wav gives choppy results

TarsosDSP Android applying lowpass filter and saving to wav gives choppy results

I am using TarsosDSP library to apply a low pass filter on a wav file. Here is the code.

private void eq2(File file) throws FileNotFoundException {
    new AndroidFFMPEGLocator(this);

    InputStream inputStream = new FileInputStream(file);
    TarsosDSPAudioFormat format =  new TarsosDSPAudioFormat(16000,16,2,true,false);
    AudioDispatcher adp = new AudioDispatcher(new UniversalAudioInputStream(inputStream,format),2048,0);

    adp.addAudioProcessor(new LowPassFS(100,16000));
    RandomAccessFile raf = null;
    raf = new RandomAccessFile(Environment.getExternalStorageDirectory()+ "/cibiodLogs/audioFiltered1.wav", "rw");
    adp.addAudioProcessor(new WriterProcessor(format,raf));
    adp.run();

    Thread audioThread = new Thread(adp, "Audio Thread");
    audioThread.start();
}

It gives output but the output is choppy and not even filtered. Here take a look at the original wav file and the output wav file.

Original

Filtered

I have tried different buffer sizes from 2 - 4096 but every time either the output is choppy or the audio is not filtered. Can someone point me what might be going wrong here.

Solution

This issue is solved now! The TarsosDSP does not support dual-channel audio processing so the algorithm was getting confused with two channels of audio and thus giving the choppy results.