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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #20 from Florent Thiéry <florent.thiery at ubicast.eu> ---
I can't rely too much on the encoding numbers because of #773546 which prevents
me from running a lot of runs but so far, GT2-SKL is seeing a big improvement
for the black 1080 pattern case (+40%) in low-power mode, +20% smpte and +1%
for snow. PG (non-low power) mode also benefits from this (~10%). I think
GT3e-SKL may have regressed between 0%-5% for all cases. Is there some kind of
compression involved in this patch ?

The improvement is less visible for 4k test samples (there even is a -5%
regression on low power mode for smpte and snow, but +15% on black).

If anyone is interested to run the same tests on other hw, try

https://github.com/UbiCastTeam/gstreamer-benchmarks

./run_tests.py -t tests/encoding-h264-nv12.py

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