[Bug 760918] omxvideodec : Use gstglmemoryegl for the RPi

[GStreamer (GNOME Bugzilla)]

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

--- Comment #5 from Gwang Yoon Hwang <yoon at igalia.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.

In ideal case, What I want to do is enabling passthrough at the glupload in
this use case.

Before this patch, glupload allocates additional GLMemory which has a
gltexture,
which is already created by EGLImageMemory.
It is a waste of memory and memory bandwidth.

Another nice point of this approach is, glupload don't have to create it's
buffer pool because it will share same buffer with OMX video decoder.
I'm not sure about a way to implement "converting", but it would means we need
to make a additional memory to wrap and refs EGLImage, and synchronize its
buffer pool with OMX's buffer, isn't it?

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