[Bug 755123] New: Protect tagdemux internal state for concurrent access.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755123

            Bug ID: 755123
           Summary: Protect tagdemux internal state for concurrent access.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gstblub at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 311484
  --> https://bugzilla.gnome.org/attachment.cgi?id=311484&action=edit
Patch file

The tagdemux doesn't appear to do any kind of locking.  This causes crashes if
the pipeline is torn down just at the "right" time, especially while a typefind
is in progress.  In my case it causes a crash in about 5-10% of the cases, and
when that happens it appears to be very similar to what was reported in bug
#700340.  It appear that bug #754375 would likely be solved with this patch as
well.

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