// https://stackoverflow.com/a/48214101

// sudo apt install vlc-plugin-access-extra !!!

!7

lib 1400526 // vlcj player (stable version for VLCJ 3)

lib 1400527 // vlcj 3

lib 1400528 lib 1400529 // jna

sS megaLibID = #1400525;

import uk.co.caprica.vlcj.player.*;

import uk.co.caprica.vlcj.player.direct.*;

import uk.co.caprica.vlcj.player.direct.format.*;

static BufferedImage image;

static MediaPlayerFactory factory;

static DirectMediaPlayer mediaPlayer;

static int width, height;

static FPSCounter fps;

p {

  pnl(pairToList(addMegaLibrary(myClassLoader(), megaLibID)));

  fixContextClassLoader();

  width = screenWidth();

  height = screenHeight();

  print(width + "/" + height);

  image = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration().createCompatibleImage(width, height);

  image.setAccelerationPriority(1.0f);

  String mrl = "screen://";

  String[] options = {

          ":screen-fps=30",

          ":live-caching=0",

          ":screen-width=" + width,

          ":screen-height=" + height,

          ":screen-left=0",

          ":screen-top=0"

  };

  pnl(options);

  factory = new MediaPlayerFactory();

  mediaPlayer = factory.newDirectMediaPlayer(new TestBufferFormatCallback(), new TestRenderCallback());

  mediaPlayer.playMedia(mrl, options);

}

// Callbacks are required.

sclass TestRenderCallback extends RenderCallbackAdapter {

  public TestRenderCallback() {

    super(((DataBufferInt) image.getRaster().getDataBuffer()).getData());

  }

  @Override

  public void onDisplay(DirectMediaPlayer mediaPlayer, int[] data) {

    if (fps == null) fps = new FPSCounter;

    fps.inc();

    print("Got image data (" + n2(l(data)) + ") - " + fps! + " fps");

    // The image data could be manipulated here...

    /* RGB to GRAYScale conversion example */

//            for(int i=0; i < data.length; i++){

//                int argb = data[i];

//                int b = (argb & 0xFF);

//                int g = ((argb >> 8 ) & 0xFF);

//                int r = ((argb >> 16 ) & 0xFF);

//                int grey = (r + g + b + g) >> 2 ; //performance optimized - not real grey!

//                data[i] = (grey << 16) + (grey << 8) + grey;

//            }

//            imagePane.repaint();

  }

}

sclass TestBufferFormatCallback implements BufferFormatCallback {

  @Override

  public BufferFormat getBufferFormat(int sourceWidth, int sourceHeight) {

      return new RV32BufferFormat(width, height);

  }

}