[Bug 760918] omxvideodec : Use gstglmemoryegl for the RPi

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760918

--- Comment #8 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #4)
> Review of attachment 319477 [details] [review]:
> 
> Don't we need to keep a different caps feature to make this work ? glupload
> can then convert to GLMemory afterward.

Technically, we don't need an extra caps feature for this specific case as it's
either GLMemoryEGL (which is compatible with the GLMemory interface) or
SystemMemory.  However, I would prefer adding the caps feature as the
allocation query may not always succeed (e.g. initial playbin/decodebin
negotiation).  I would suggest the following rules for omxviddec to choose the
the GL allocator.

GLMemoryEGL - require the correct allocator in the allocation query/pool
GLMemory - use the egl allocator regardless

glupload would just passthrough everything when converting from GLMemoryEGL to
GLMemory.  This may require some basetransform work to actually passthrough the
e.g. allocation query correctly.

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