Capture RTCP Sender Report with rtpbin/rtspsrc

[mdbtfu]

Hi,

I'm developping a program that displays the images of an IP camera. The
camera's clock is synchronised with an NTP server and I would like to get
the NTP timestamp of the RTCP sender report (as described in the RFC 1889
https://tools.ietf.org/html/rfc1889#section-6.3.1).

I found some topics about this but none gave me the solution to my problem.


Here is my pipeline :

gst-launch-1.0 rtpbin name=rtpbin latency=200 rtspsrc
location="rtsp://172.29.179.179:554/0" latency=1 ! rtpbin.recv_rtp_sink_0
rtpbin. ! rtph264depay ! avdec_h264 ! videoconvert ! autovideosink udpsrc
port=6970 ! rtpbin.recv_rtcp_sink_0 rtpbin.send_rtcp_src_0 ! udpsink
port=49900 host=172.29.179.179 sync=true async=false


And here is the code I use.

	
**************

	// Initialisation of GStreamer
	gst_init(NULL, NULL);
	GMainLoop *loop = g_main_loop_new(NULL, NULL);

	// Create pipeline
	string str_pipeline = "rtpbin name=rtpbin latency=200";
	str_pipeline += " rtspsrc location=rtsp://172.29.179.179:554/0
caps=video/x-raw-rgb !";
	str_pipeline += " rtpbin.recv_rtp_sink_0 rtpbin. ! rtph264depay !
avdec_h264 ! videoconvert ! videoscale ! autovideosink";
	str_pipeline += " udpsrc name=udpsrc port=6970 ! rtpbin.recv_rtcp_sink_0
rtpbin.send_rtcp_src_0 ! udpsink port=49900 host=172.29.179.179 sync=true
async=false";

	// Parse pipeline
	GError * message = NULL;
	GstElement *pipeline = gst_parse_launch(str_pipeline.c_str(), &message);

	// Set bus to get messages
	GstBus *bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
	gst_bus_add_watch(bus, camera_bus_callback, NULL);
	gst_object_unref(bus);

	// Set pipeline to play
	gst_element_set_state(pipeline, GST_STATE_PLAYING);

	// Iterate
	g_main_loop_run(loop);
	
	gst_element_set_state(pipeline, GST_STATE_NULL);
	gst_object_unref(pipeline);
	g_main_loop_unref(loop);
	
**************
	

I've read the documentation of rtpbin and rtspsrc and didn't understand how
to get the sender report. Which signal from rtpbin or rtspsrc should I use? 
	

I would be really thankful for any help!

Thibaud	
	



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