Play Video with GStreamer and wxPanel

Question

I'm learning GStreamer and its fun, but I have hit a wall in using it with wxWidgets. No matter what I try I cannot break through. Examples out there are GTK/Qt which are helpful only to some limits. Here is Current code (which does not work) and below it error messages I get

wxGStreamer::wxGStreamer(wxWindow* parent, wxWindowID winid, const wxURI& location):wxPanel(parent, winid)
{
    SetBackgroundColour(*wxBLACK);

    /* Build the pipeline */
    wxString uri = location.BuildURI();
    wxPuts(uri);

    // prepare the pipeline
    GstElement *pipeline = gst_pipeline_new("xvoverlay");
    GstElement *src = gst_element_factory_make("videotestsrc", NULL);
    GstElement *sink = gst_element_factory_make("xvimagesink", NULL);
    gst_bin_add_many(GST_BIN(pipeline), src, sink, NULL);
    gst_element_link(src, sink);

    /* Set the URI to play */
    g_object_set (pipeline, "uri", "http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);

    GtkWidget* widget = GetHandle(); 
    guintptr video_window_handle = GDK_WINDOW_XID (gtk_widget_get_window (widget)); 
    gst_video_overlay_set_window_handle(GST_VIDEO_OVERLAY(sink), video_window_handle); 

    // run the pipeline
    GstStateChangeReturn sret = gst_element_set_state(pipeline,
                                GST_STATE_PLAYING);

    if(sret == GST_STATE_CHANGE_FAILURE)
    {
        gst_element_set_state(pipeline, GST_STATE_NULL);
        gst_object_unref(pipeline);
    }

    gst_element_set_state(pipeline, GST_STATE_NULL);
    gst_object_unref(pipeline);
}

where wxGStreamer is defined as

class  wxGStreamer : public wxPanel {............};

Errors

Answer 1

即使您不想只使用它（为什么？），也至少要看看wxMediaCtrl （在Unix下使用GStreamer实现）做什么。

Answer 2

Add sync handler using gst_bus_set_sync_handler and then inside that function use GstVideoOverlay to channel video to your widget. Here is a working sample function.

static GstBusSyncReply
bus_sync(GstBus* bus, GstMessage* message, gpointer user_data)
{
    CustomData* data = reinterpret_cast<CustomData*>(user_data);        

    if(!gst_is_video_overlay_prepare_window_handle_message(message))
        return GST_BUS_PASS;            
    else
    {
        if(data->xid!=NULL)
        {

            GstVideoOverlay *overlay;
            overlay = GST_VIDEO_OVERLAY(GST_MESSAGE_SRC(message));
            gst_video_overlay_set_window_handle(overlay, data->xid);
        }

        return GST_BUS_DROP;
    }
}