sclass StreamSoundToAPlay implements AutoCloseable {
  Process process;
  InputStream in;
  OutputStream out;
  int sampleRate = 44100, channels = 2, bits = 16;
  int bufSizeMS = 0; // 0 = default
  double duration = yearsToSeconds(1); // max seconds
  GSWavFile wavStream;
  long frameCounter = 0;
  
  void start ctex {
    assertOnPATH("aplay");
    Process process = Runtime.getRuntime().exec("aplay"
      + (bufSizeMS == 0 ? "" : " -B " + bufSizeMS));
    
    // 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) ctex {
    if (samples != null) for (short x : samples) {
      wavStream.writeSample(x);
      ++frameCounter;
    }
  }
  
  public void close {
    dispose wavStream; // also closes the stream & thereby ends the process
  }
}