[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 #10 from Olivier Crête <olivier.crete at ocrete.ca> ---
Created attachment 310389
  --> https://bugzilla.gnome.org/attachment.cgi?id=310389&action=edit
gstrtpmux: allow the ssrc-property to decide ssrc on outgoing buffers

By not doing this, the muxer is not effectively a rtpmuxer, rather a
funnel, since it should be a single stream that exists the muxer.

If not specified, take the first ssrc seen on a sinkpad, allowing upstream
to decide ssrc in "passthrough" with only one sinkpad.

Also, let downstream ssrc overrule internal configured one

We hence has the following order for determining the ssrc used by
rtpmux:

0. Suggestion from GstRTPCollision event
1. Downstream caps
2. ssrc-Property
3. (First) upstream caps containing ssrc
4. Randomly generated

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