[Bug 779146] dmabuf: be able to negotiate tiled surfaces

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779146

--- Comment #20 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
In real life, a pipeline like:

... ! vaapidecode ! textoverlay ! vaapiencode ! ..

Will use linear memory backend. So still not copying, but will pay the
overhead. While if you do:

... ! vaapidecode ! vaapiencode ! ...

You'll negotiate DMABuf caps feature + the modifiers supported. Modififers
negotiation could eventually be added to glupload/download, waylandsink and
kmssink, but that seems far in the future though.

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