[Bug 776927] gl: gldownload: convert GstGLMemory to GstDmaBuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776927

--- Comment #57 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 364304
  --> https://bugzilla.gnome.org/attachment.cgi?id=364304&action=edit
gldownload: Add dmabuf exporting

I've rebased the patch on top of master and started cleaning it up. I have
added
TODO in places were I'm not done yet. So right now, whenever it fails
exporting,
it does not downgrade downstream caps to sysmem when possible, or fail with
not-negotiated.

Some small interregotation I had was also about the API, shall we do
gst_egl_image_to_dmabuf() to the oppsite of existing _from_dmabuf() ?

Other then that this patchset seems to work fine now. I've changed the
prefered order to be GLMemory (or do nothing), DMABuf and finally SysMem.

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