rem: gst_video_widget_get_source_size (GstVideoWidget * vw, gint * width, gint * height)
add: gst_video_widget_get_source_size (GstVideoWidget * vw, guint * width, guint * height)
context: gst_video_widget_get_source_size (GstVideoWidget * vw, gint * width,				  gint * height){  g_return_val_if_fail (vw != NULL, FALSE);  g_return_val_if_fail (GST_IS_VIDEO_WIDGET (vw), FALSE);  *width = vw->priv->source_width;  *height = vw->priv->source_height;  return TRUE;}