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Receive backchannel audio in Server #597

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RogerHardiman
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This is work in progress, but wanting to raise a PR for some feedback from the gortsplib project

This code modifies 'examples/proxy' so that it adds an ONVIF backchannel media description.
When a RTSP client with ONVIF backchannel support (eg examples/client-play-backchannel) connects to this modified Proxy, the proxy receives the RTP audio packets.
Currently it just lots them to the screen, but the next step is to pass them to the audio hardware on my Pi

So just wanted someone to take a look and see what things are good, and what things are bad and need re-writing.

Thanks
Roger

Does not forward on to upstream rtsp source

Tested with UDP audio from the examples/client-play-backchannel

Required enabling a UDP listener and RTP re-ordering when in Play Mode and IsBackChannel is true
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