[Bug 752694] rtpmux: allow the ssrc-property to decide ssrc on outgoing buffers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752694

--- Comment #6 from Olivier Crête <olivier.crete at ocrete.ca> ---
Setting something in getcaps is wrong. And the current code breaks the
Farstream unit tests.

I think what you want to do is, in setcaps, get the downstream caps, if they
are set, then take the ssrc from there, is not, try the property and as a last
resort, generate a random one. I'd also drop everything that is not
ssrc/timestamp-offset/seqnum-offset/clock-rate/media-type from the caps. In any
subsequent setcaps, if the clock-rate/media-type match the current ones, just
return TRUE without pushing a different event. This will reduce the amount of
churn. Also, we need to support the GstRTPCollision event to deal with SSRC
collisions correctly.

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