sclass StreamSoundToAPlay {
  Process process;
  InputStream in;
  OutputStream out;
  int sampleRate = 44100, channels = 2, bits = 16;
  double duration = yearsToSeconds(1); // max seconds
  GSWavFile wavStream;
  long frameCounter = 0;
  
  void start {
    assertOnPATH("aplay");
    Process process = Runtime.getRuntime().exec("aplay");
    
    // should probably print those instead
    drainStreamInNewThread(process.getInputStream());
    drainStreamInNewThread(process.getErrorStream());
    
    out = process.getOutputStream();
    long numFrames = (long)(duration * sampleRate);
  
    wavStream = GSWavFile.newWavFile(out, null, channels, numFrames, bits, sampleRate);
  }
  
  void writeSamples(short[] samples) {
    double[][] buffer = new double[2][100];

  while (frameCounter < numFrames) {
    // Determine how many frames to write, up to a maximum of the buffer size
    long remaining = wavFile.getFramesRemaining();
    int toWrite = (remaining > 100) ? 100 : (int) remaining;

    // Fill the buffer, one tone per channel
    for (int s=0 ; s<toWrite ; s++, frameCounter++)
    {
       buffer[0][s] = Math.sin(2.0 * Math.PI * 400 * frameCounter / sampleRate);
       buffer[1][s] = Math.sin(2.0 * Math.PI * 500 * frameCounter / sampleRate);
    }

    // Write the buffer
    wavFile.writeFrames(buffer, toWrite);
  }
  
  public void close {
    dispose wavFile; // also closes the stream & thereby ends the process
  }
}