RTSP internals - where are RTSP answers send to network?

[Maurer, Marie]

Hi,

I am currently trying to debug an error, which happens with the RTSP server on our i.MX6 platform.
I receive an RTSP OPTIONS and/or RTSP DESCRIBE message (which is sent by VLC from my PC), see partly at least an answer in GStreamer logfile, like

0:00:40.211213339 [335m 1168[00m 0x2f99cc30 [36mINFO   [00m [00m          rtspclient rtsp-client.c:3456:handle_request:[00m client 0x38a4080: received a request OPTIONS rtsp://10.5.122.41:8554/live 1.0
0:00:40.212387005 [335m 1168[00m 0x2f99cc30 [33;01mLOG    [00m [00m          rtspclient rtsp-client.c:1143:default_pre_signal_handler:<GstRTSPClient at 0x38a4080>[00m returning GST_RTSP_STS_OK
0:00:40.215443005 [335m 1168[00m 0x2f99cc30 [36mINFO   [00m [00m          rtspclient rtsp-client.c:3456:handle_request:[00m client 0x38a4080: received a request DESCRIBE rtsp://10.5.122.41:8554/live 1.0
0:00:40.215639672 [335m 1168[00m 0x2f99cc30 [33;01mLOG    [00m [00m          rtspclient rtsp-client.c:1143:default_pre_signal_handler:<GstRTSPClient at 0x38a4080>[00m returning GST_RTSP_STS_OK

but the answer cannot be seen in Wireshark located on same PC as VLC. After 5 seconds VLC sends a setup message???
Sometimes I even don't see the lines with "returning GST_RTSP_STS_OK".

It looks like when I increase the amount of Gstreamer debug messages, it is more likely I am missing at least 1 answer on the network.
But at the moment it is a lot speculation, not yet debugged deep enough.

Where (in source code) would be the place, where the answer is sent to network?

I see signals like pre-describe-request and pre-options-request.

Is it done in rtsp-client.c? Even as RTSP server? There at least I see functions like send_generic_response and send_message.

Is there perhaps some documentation or video/presentation showing a bit the internals of RTSP server implementation?

Many thanks!

Best regards,

Marie



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