public struct Picture
    {
        public int width;
        public int height;
        public uint8[] data;
    }
/***/
    public Picture current_picture {
            owned get {
                Picture pic = Picture();
                var caps = Gst.Caps.from_string("video/x-raw, format=(string)RGB, pixel-aspect-ratio=(fraction)1/1");
                Gst.Sample sample;
                Signal.emit_by_name(playbin, "convert-sample", caps, out sample);
                if(sample == null)
                    return pic;
                var sample_caps = sample.get_caps ();
                if(sample_caps == null)
                    return pic;
                var structure = sample_caps.get_structure(0).copy ();
                pic.width = (int)structure.get_value ("width");
                pic.height = (int)structure.get_value ("height");
                var memory = sample.get_buffer ().get_memory (0);
                Gst.MapInfo info;
                memory.map (out info, Gst.MapFlags.READ);
                pic.data = info.data;
                return pic;
            }
        }