GstRTSPParams
GstRTSPResult gst_rtsp_params_get (GstRTSPClient *client, GstRTSPContext *ctx);
GstRTSPClient *client
GstRTSPContext *ctx
GstRTSPResult gst_rtsp_params_set (GstRTSPClient *client, GstRTSPContext *ctx);