[Bug 753591] vaapi: encoders: implement "direct-uploading"

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753591

--- Comment #12 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to sreerenj from comment #11)
> (In reply to Josep Torra Valles from comment #9)

> > It almost doubles encoder performance.
> > 
> > Being able to stream 2x4K at 28 and 3x4K at 22 when without it I can just 1x4K at 28
> > in my hardware without using LP mode. 
> 
> Good, but not enough ;),,,

Josep asked me if we are going to push this for 1.10. @Sree, what do you thing? 
IMO if we push this, we also should merge Julien's work for dmabuf to
downstream.

> I guess you are testing with out dmabuf, right ?
> Wondering what is performance gap between dmabuf and non-dmabuf mode...

In the case if dmabuf to upstream, I don't see more room for improvement
(perhaps I'm missing something), but disabling the linear storage flag in the
allocator creation.

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