Get pcm data from mp3 file in android

My question is simple. How to get PCM data from mp3 file?

Now I only found a way to get the PCM bytes from the song, downloaded and played the mp3 MediaPlayer

and tried to listen to the change of waves on Visualizer.OnDataCaptureListener

. This interface method passes a parameter byte[] bytes

. I tried to store all these bytes into one byte array and then passed that array to a method AudioTrack.write

and reproduced it with the method AudioTrack.play

. Something like that:

    mVisualizer.setDataCaptureListener(new Visualizer.OnDataCaptureListener() {
                public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes,
                        int samplingRate) {
                       // allBytes += bytes
                }
        public void onFftDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate) {
               }
, Visualizer.getMaxCaptureRate() / 2, true, false);
     }

      

        
        
        
      

    

and then

AudioTrack tr = new AudioTrack(AudioManager.STREAM_MUSIC, 22050, 
                              AudioFormat.CHANNEL_OUT_STEREO,   
                              AudioFormat.ENCODING_PCM_16BIT,
                              allBytes.length, AudioTrack.MODE_STREAM);
tr.play();
tr.write(barr, 0, allBytes.length);

      

        
        
        
      

    

Unfortunately, I didn't expect results. The sound is playing, but there is a lot of noise in the sound, the quality is so poor that you cannot determine what is singing there.

But it was some kind of "hacking method" to get PCM data. Can you tell if there is a normal method for getting PCM data from my mp3?