!7

// Original source: AudioLoop from jsresources.org

static int DEFAULT_INTERNAL_BUFSIZ = 40960, DEFAULT_EXTERNAL_BUFSIZ = 40960;

p {
  new AudioLoop(javaSound_cdQuality(), DEFAULT_INTERNAL_BUFSIZ, DEFAULT_EXTERNAL_BUFSIZ).start();
}

sclass AudioLoop extends Thread {
  TargetDataLine in;
  SourceDataLine out;
  new Flag stopFlag;
  int externalBufferSize;
  byte[] buf;
  
  *(AudioFormat format, int internalBufferSize, int *externalBufferSize) {
    out = javaSound_outputLine(format, internalBufferSize);
    buf = new byte[internalBufferSize];
  }
  
  public void start { out.start°; super.start°; }
  void stopPlaying { out.close°; stopFlag.raise°; } // "stop()" was taken
  
  long count;
  double nextSample() {
    ret Math.sin(count++/44100.0*440*2*pi())*0.5;
  }

  public void run° {
    while (licensed() && !stopFlag.isUp()) {
      for (int i = 0; i < l(buf); i += 4) {
        double f = nextSample();
        int x = iround(max(0, min(1, f))*32767);
        buf[i] = buf[i+2] = (byte) x;
        buf[i+1] = buf[i+3] = (byte) (x >> 8);
      }
      
      print("Writing " + l(buf) + " bytes");
      int n = out.write(buf, 0, l(buf));
      if (n != l(buf)) print("huh: " + n + " of " + l(buf));
    }
  }
}

Began life as a copy of #1009287