[Bug 770766] New: rtpssrcdemux: Fix race condition in clear-ssrc signal handler

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770766

            Bug ID: 770766
           Summary: rtpssrcdemux: Fix race condition in clear-ssrc signal
                    handler
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gstblub at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 334666
  --> https://bugzilla.gnome.org/attachment.cgi?id=334666&action=edit
rtpssrcdemux: Fix race condition in clear-ssrc signal handler

I sometimes run into a critical error like this:

GStreamer-CRITICAL **: Padname src_1119852695 is not unique in element
rtpssrcdemux2, not adding

This is because of a race condition with clear-ssrc and another rtp/rtcp packet
with the same ssrc coming in, which could cause a new pad with the same name to
be added before the one being cleared was actually removed.

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