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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #4 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
I have pushed a branch, in my repository, with direct upload working:

https://github.com/ceyusa/gstreamer-vaapi/commits/753591

Using this pipeline 

gst-launch-1.0 videotestsrc ! video/x-raw, width=1920, height=1080 !
vaapih264enc ! fakesink

Without the patches, the CPU usage is ~76%
With the patches, the CPU usage is ~69%

The last patch is for enabling direct rendering, but I see a couple problems:
VPP fails to process surfaces with vaDerivedImages and, when the allocation
caps are different from the negotation caps, the sink cannot map the frame.

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