static int captureAudioFromLine3_bufSize = 65536;

// uses default line
static void captureAudioFromLine3(AudioFormat format, OutputStream out, Flag stop) ctex {
  AudioLine line = first(allTargetDataLines());
  assertNotNull("Need audio input line!", line);
  DataLine dataLine = cast line.open();
  captureAudioFromLine3(dataLine, format, out, stop);
}

static void captureAudioFromLine3(DataLine line, AudioFormat format, OutputStream out, Flag stop) ctex {
  if (!line instanceof TargetDataLine) fail(getClassName(line));
  TargetDataLine tdl = cast line;
  tdl.open(format);
  tdl.start();
  int n;
  byte[] buf = new byte[captureAudioFromLine3_bufSize];
  while (licensed() && !stop.isUp() && (n = tdl.read(buf, 0, l(buf))) > 0) {
    out.write(buf, 0, n);
  }
  tdl.close();
}

Began life as a copy of #1007026