Reconnecting to stream about uvgrtp

[wowaser]

As far as I understand, this does not directly contradict the RFC

[jrsnen]

Hi,

thank you for submitting this. I added #183 to discuss what happens in RTCP when a stream drops.

As for reconnecting the stream, I have to think and investigate this a little more before coming to a conclusion. I feel that modifying the most important API function is a bit intrusive (and potentially confusing) when this is mostly used to restarting streams when something has gone wrong. Still, I like the idea of possibly restarting the stream with the same SSRC if the end had to close temporarily (maybe preparing for crashes is not a good reason, but subscribing to an existing stream or something similar might be enough justification for this).

So my points are:

1. Is there a reason to use the same SSRC again besides crashing?
2. Is there a way to implement this without modifying the one of the important API functions the users call (maybe a configure flag?)?

I can also try to figure out something, but it may be a while before I have the time.

BR, Joni

[wowaser]

1. I think that it makes sense to have stable SSRCs for controlled setups, i.e. 10 cameras and 10 streams numbered 1-10, and they are always numbered like this. That way it is easy to manage them, you can exit streams if they are not needed/camera not working, and then when you restart it, it is still the same stream identifier.
2. It can be set as an rce_flag that allows SSRC setting. And then there is a window between when the media_stream object is created and the transmission starts. In this case, changing the SSRC will not cause any trouble for the other end. Just a simple setter function that allows setting of the SSRC only before sending/receiving anything

[jrsnen]

@wowaser Ok, you have convinced me. Please add the implementation to here.

Add a new RCC_ flag here. Name could as simple as RCC_SSRC

This discussion does bring up the question that there should a proper way to also get the value of these variables. I added #184 to discuss this. This would deprecate the get_ssrc function in media_stream.

BR, Joni