code: @Override
      public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream audioInputStream) {
          if (isConversionSupported(targetFormat, audioInputStream.getFormat())) {
              return new DecodedVorbisAudioInputStream(targetFormat, audioInputStream);
          } else {
              throw new IllegalArgumentException("conversion not supported");
          }
      }
docs: Returns converted AudioInputStream.
  
  @param audioInputStream
  @return