gistfile1.vala

using Gtk;
using Gst;

public class VideoSample : Window {

    private DrawingArea drawing_area;
    private Pipeline pipeline;
    private Element src;
    private Element sink;
	private Element decode;
	private Element colorspace;

    public VideoSample() {
        create_widgets();
        setup_gst_pipeline();
    }

    private void create_widgets() {
        var vbox = new VBox(false, 0);
        this.drawing_area = new DrawingArea();
        this.drawing_area.set_size_request(300, 150);
        vbox.pack_start(this.drawing_area, true, true, 0);

        var play_button = new Button.from_stock(STOCK_MEDIA_PLAY);
        play_button.clicked.connect(on_play);
        var stop_button = new Button.from_stock(STOCK_MEDIA_STOP);
        stop_button.clicked.connect(on_stop);
        var quit_button = new Button.from_stock(STOCK_QUIT);
        quit_button.clicked.connect(Gtk.main_quit);

        var bb = new HButtonBox();
        bb.add(play_button);
        bb.add(stop_button);
        bb.add(quit_button);
        vbox.pack_start(bb, false, true, 0);

        add(vbox);
    }

    private void on_play() {
    	stdout.printf("on_play()\n");
    	var xoverlay = this.sink as XOverlay;
        xoverlay.set_xwindow_id (Gdk.x11_drawable_get_xid (this.drawing_area.window));
        this.pipeline.set_state(State.PLAYING);
    }

    private void on_stop() {
        this.pipeline.set_state(State.READY);
    }

    public static int main(string[] args) {
        Gst.init (ref args);
        Gtk.init(ref args);

        var sample = new VideoSample();
        sample.show_all();

        Gtk.main();

        return 0;
    }

    private void setup_gst_pipeline() {
		this.pipeline = new Pipeline ("mypipeline");
		this.src = ElementFactory.make("filesrc", "filesrc");
		this.decode = ElementFactory.make("decodebin", "decode");
		this.colorspace = ElementFactory.make("ffmpegcolorspace", "colorspace");
		this.sink = ElementFactory.make ("xvimagesink", "sink");

		src.set_property("location", "/home/esalazar/backlot/Rendezvous.avi");
		decode.pad_added.connect(onDynamicLoad);

		pipeline.add_many(src, decode, colorspace, sink);
		pipeline.link_many(src, decode);
		pipeline.link_many(colorspace, sink);
    }

	private void onDynamicLoad(Pad pad)
	{
		stdout.printf("!!Connecting pad!!\n");
		pad.link(colorspace.get_pad("sink"));
	}
}