[Bug 699352] shm: Allow caps to change in PLAYING state

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=699352
  GStreamer | gst-plugins-bad | unspecified

--- Comment #3 from Joshua M. Doe <oss at nvl.army.mil> 2013-05-03 16:54:48 UTC ---
I've attached a patch that does this for 0.10, but will port to 1.0 if it would
be accepted upstream. This is applied on top of the patch
[here](https://bugzilla.gnome.org/show_bug.cgi?id=698657), but does not depend
on it.

I know the current design is to have ShmPipe be completely independent of any
GStreamer concepts, but I'm not sure what the value is in this. This patch,
while perhaps crude, does allow the caps to be changed during the PLAYING state
(convenient for me where an application can toggle between views of different
width/height/format), and perhaps significant to more people is that a
capsfilter is no longer needed with shmsrc.

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