GST_IS_PROXY_PAD  483 gst/gstghostpad.c   g_return_val_if_fail (GST_IS_PROXY_PAD (object), NULL);
GST_IS_PROXY_PAD  724 gst/gstghostpad.c   if (!GST_PAD_PEER (target) || !GST_IS_PROXY_PAD (GST_PAD_PEER (target))) {