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!7

import org.jcodec.api.awt.AWTSequenceEncoder8Bit;

static int framesToEncode = 100000;

p {
  inputFilePath("Video to modify", voidfunc(final File video) {
    thread {
      File outFile = prepareProgramFile(addSuffix("inverted-" + video.getName(), ".mp4"));
      int n = 0;
      for (BufferedImage img : framesFromVideo_reordering(video)) {
        
        print("Frames: " + n + "/" + framesToEncode);
        if (++n >= framesToEncode) break;
      }

      print("Wrote " + f2s(outFile) + " (" + n + " frames)");
    }
  });
}

// decoding part
sclass LeftQueue {
  Iterator<BufferedImage> stream;
  RightQueue rightQueue;

  *(File video) {
    stream = framesFromVideo_reordering(video);
  }
  
  void step {
    if (stream != null && rightQueue.needImage())
      if (stream.hasNext())
        rightQueue.receive(stream.next());
      else {
        stream = null;
        rightQueue.close();
      }
  }
}

// encoding part
sclass RightQueue {
  AWTSequenceEncoder8Bit enc;
  volatile BufferedImage img;
  int frames;

  *(File outMP4) {
    AWTSequenceEncoder8Bit enc = AWTSequenceEncoder8Bit.create25Fps(outMP4);
    enc.getEncoder().setKeyInterval(25);
  }
    
  void receive(BufferedImage img) {
    if (this.img != null) fail();
    this.img = img;
  }
  
  bool needImage() { ret img == null; }
  
  void step {
    if (img != null) {
      img = invertedImage(img);
      enc.encodeImage(img);
      img = null;
    }
  }
  
  void close {
    enc.finish();
  }
}