Performance of the canvas

I've been testing the performance of canvas on a very fast machine (quad core Xeon) by recent NVidia graphics cards, but I am unable to make the video full screen 1920 x 1080 with this configuration using the Web.

It's simply too much hope for or am I missing some obvious performance enhancements?

Here's the code I used:
import java.nio.ByteBuffer;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.image.PixelFormat;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritablePixelFormat;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import uk.co.caprica.vlcj.component.DirectMediaPlayerComponent;

import com.sun.jna.Memory;
import com.sun.jna.NativeLibrary;

public class VLCDirectTest extends Application {

  public static void main(final String[] args) {
    Application.launch(args);
  }

  private DirectMediaPlayerComponent mp;

  @Override
  public void start(Stage primaryStage) throws Exception {
    NativeLibrary.addSearchPath("libvlc", "c:/program files (x86)/videolan/vlc");

    BorderPane borderPane = new BorderPane();
    final Canvas canvas = new Canvas(1920, 1080);
    borderPane.setCenter(canvas);
    System.out.println(">>> " + canvas.getGraphicsContext2D().getPixelWriter().getPixelFormat());
    Scene scene = new Scene(borderPane);
    final PixelWriter pixelWriter = canvas.getGraphicsContext2D().getPixelWriter();
    final WritablePixelFormat<ByteBuffer> byteBgraInstance = PixelFormat.getByteBgraInstance();

    mp = new DirectMediaPlayerComponent("RV32", 1920, 1080, 1920*4) {
      @Override
      public void display(Memory nativeBuffer) {
        ByteBuffer byteBuffer = nativeBuffer.getByteBuffer(0, nativeBuffer.size());
        pixelWriter.setPixels(0, 0, 1920, 1080, byteBgraInstance, byteBuffer, 1920*4);
      }
    };

    mp.getMediaPlayer().playMedia("L:\\test-movies\\2012.mkv");

    primaryStage.setScene(scene);
    primaryStage.show();
  }
}
It works, but it hickups and distorts a lot when it hickups. Lower the resolution of 1600 x 900 to say, it is almost smooth. Lowering still gets the expected 24 frames per second.

Try to use IntBuffer, it's get-buffer possible bytes converted per pixel. I think if the pixel format and the width of the scan line corresponds,
System.arraycopy (...) is used instead of a loop / conversion on each pixel. It should be enough to download full HD of 25 frames per second.

There is also no need to use the node of the Web, you can use WritableImage.getImageWriter () .setPixels () with IntBuffer.
It is possible that the canvas node distributes all the draw lots / pixel in the render thread events and copy the array / buffer again.
I'd be curious what performance you get.

And well, I didn't know you could so easily integrate VLC =)

-----

PS:
Oh too bad for me that the WritableImage has a 'ByteBgraPre' (premultiplied) PixelFormat. Then
imgWriter.setPixels (0, 0, w, h, PixelFormat.getByteBgraPreInstance (), pixels.asByteBuffer (), w * 4);
was a little better than:
imgWriter.setPixels (0, 0, w, h, PixelFormat.getByteBgraInstance (), pixels.asByteBuffer (), w * 4);
For opaque, premultiplied images is not serious anyway. I managed to get 45 fps with upload of 1920 x 1200 pixels.

Published by: Fatima Sep 2, 2012 09:34

Tags: Java

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