[Bug 783521] gl: Add "direct" dmabuf uploader

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783521

Michael Olbrich <m.olbrich at pengutronix.de> changed:

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--- Comment #18 from Michael Olbrich <m.olbrich at pengutronix.de> ---
Created attachment 370478
  --> https://bugzilla.gnome.org/attachment.cgi?id=370478&action=edit
WIP gldownload: Implement direct dmabuf uploader

An updated version of the patch. It's far from finished. I'm not sure when I
have some time to continue this. Hopefully soon.

The fallback to software upload is ugly right now. It looses one buffer.
The solution will be to move the accept to 'before_transform' and let the base
transform class reconfigure with the selected upload only.

We'll still need to handle a failing 'perform', but I think we can avoid it for
the new upload method.
Is there a known use-case where 'perform' actually fails, or is this 'just in
case' right now?

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