How to decode mp3 to PCM?

Question

Java

The task is to decode mp3 into pulse-code modulation.
In the open spaces of the network I found the JLayer
library I threw a class:

public class test {

  public static void main(String[] args) throws DecoderException, BitstreamException, IOException{
    
    Bitstream bitStream = new Bitstream(new FileInputStream("Work/sin.mp3"));
    
    boolean done = false;
    SampleBuffer output = null;
    int i = 0;
    int k = 0;
    while(! done){
      Header frameHeader =  bitStream.readFrame();
      
      i++;
      if (frameHeader == null) {
                done = true;
            } 
      else {

        Decoder decoder = new Decoder();
        output =  (SampleBuffer) decoder.decodeFrame(frameHeader, bitStream); //возвращает следующие 2304 сэмпла

//				int freq = output.getSampleFrequency();     //частота дискретизации
//				int channel = output.getChannelCount();    //количество каналов

        short[] next = output.getBuffer();
        
                               System.out.println(next);				
      }
      bitStream.closeFrame();    
    }
  }
  
}

For each frame, a value of the form " [[email protected] " is returned.
Please tell me how to parse it into pulse code modulation?
Or maybe you know another library with such functionality and know how to implement decoding with its help?
Thanks in advance!

Answer 1

Can you please tell me how to parse it into pulse code modulation?

As far as I understand this is what it is, try this:
System.out.println(Short.valueOf(next));

Answer 2

Fesor , thank you very much!
But now if we take several frames from the audio file and separate one channel, you can see such a picture
. 3 frames are clearly visible, and each of them takes the value 0 at the beginning for some time.
I'm having doubts, is the audio data really recorded in mp3 like this, or is it a decoding flaw?