[Bug 762219] New: rtpsession: don't act on suspicious BYE RTCP

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762219

            Bug ID: 762219
           Summary: rtpsession: don't act on suspicious BYE RTCP
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: havard.graff at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: gstreamer at pexip.com
     GNOME version: ---

Created attachment 321539
  --> https://bugzilla.gnome.org/attachment.cgi?id=321539&action=edit
test and fix

Some endpoints (like Tandberg E20) can send BYE packet containing our
internal SSRC. I this case we would detect SSRC collision and get rid
of the source at some point. But because we are still sending packets
with that SSRC the source will be recreated immediately.
This brand new internal source will not have some variables incorrectly
set in its state. For example 'seqnum-base` and `clock-rate` values will be
-1.
The fix is not to act on BYE RTCP if it contains internal or unknown
SSRC.

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