sinterface Capturer {
  void stop();
  byte[] getPCM();
  AudioFormat format();
}

static Capturer captureAudioFromLine2(DataLine line, final AudioFormat format) ctex {
  if (!line instanceof TargetDataLine)
    fail(getClassName(line));
  final TargetDataLine tdl = cast line;
  tdl.open(format);
  tdl.start();
  ret new Capturer {
    volatile bool stopped;
    new ByteArrayOutputStream baos;
    
    public void stop() { stopped = true; }
    
    {
      thread "Audio Capture" {
        try {
          int total = 0, n;
          byte[] buf = new byte[1024];
          while (!stopped && licensed() && (n = tdl.read(buf, 0, l(buf))) > 0) {
            total += n;
            baos.write(buf, 0, n);
            //print("Bytes read from line: " + total);
          }
        } finally {
          tdl.close();
        }
      }
    }
    
    public byte[] getPCM() {
      ret baos.toByteArray();
    }
    
    public AudioFormat format() {
      ret format;
    }
  };
}

Began life as a copy of #1007026