[Bug 646566] Protect against Pad-Parent disappearing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=646566
  GStreamer | gstreamer (core) | git

--- Comment #13 from Olivier Crete (Tester) <olivier.crete at ocrete.ca> 2011-04-04 14:11:12 UTC ---
There is bug #631580, it has a test case, but no patches. I could never make a
patch that would work in all case.
I think one solution for 0.11 is to have the pad functions ref the parent and
pass it to the callback (so getcaps() for example could be blah_getcaps(Pad
*pad, GstObject *parent);
Also, we currently don't require pads to have a parent, it may be much easier
if we did.

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