static recordToAudioListeners_AudioLoop recordToAudioListeners(L<VF1<short[]> audioListeners, int bufSize) {
  recordToAudioListeners_AudioLoop loop = new(bufSize);
  loop.audioListeners = audioListeners;
  ret loop;
}

sclass recordToAudioListeners_AudioLoop extends Thread implements AutoCloseable {
  TargetDataLine line;
  new Flag stopFlag;
  byte[] buf;
  short[] convertedBuf;
  L<VF1<short[]>> audioListeners

  *(int bufSize) {
    line = javaSound_recordLine(javaSound_cdQuality(), bufSize);
    buf = new byte[bufSize];
    convertedBuf = new short[bufSize/2];
  }
  
  public void start { line.start°; super.start°; }
  void stopRecording { // "stop()" was taken
    if (stopFlag.isUp()) ret;
    stopFlag.raise°; line.close°;
    print("Audio input loop stopped.");
  }
  public void close { stopRecording(); }
  
  public void run° {
    print("Audio input loop started. Buffer size=" + l(buf) + " (" + iround(l(buf)/44100.0/4*1000) + " ms)");
    
    while (licensed() && !stopFlag.isUp()) {
      int n = line.read(buf, 0, l(buf));
      if (stopFlag.isUp()) break;
      if (n < l(buf)) print("Weird: Got less than a buffer: " + n + "/" + l(buf));
      handleData(buf, n);
    }
  }
  
  void handleData(byte[] data, int n) {
    bytesToShorts_littleEndian(buf, convertedBuf, n);
    short[] convertedData = subShortArray(convertedBuf, 0, n/2);
    lvVolume.set(shortSamplesToPercentVolume(convertedData));

    for i over audioListeners: { // synchro-safe, garbage-free iteration
      VF1<short[]> l = syncGet(audioListeners, i);
      continue if l == null;
      callF(l, convertedData);
    }
  }
}