[Bug 766050] New: Add Low power, High performance h264 encoder support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766050

            Bug ID: 766050
           Summary: Add Low power, High performance h264 encoder support
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bsreerenj at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Intel Skylake platform has the support for low power/ high performance h264
encoder. Unlike the older platforms, SKL has dedicated encoder engine(VDENC)
for doing low power encoding with out depending on EUs. We are not yet
utilizing it since the driver doesn't had code path to enable VDENC.

Now the patches landed in mailing list for libva and vaapi-intel-driver:
https://lists.freedesktop.org/archives/libva/2016-May/003938.html
https://lists.freedesktop.org/archives/libva/2016-May/003935.html
https://lists.freedesktop.org/archives/libva/2016-May/003937.html
https://lists.freedesktop.org/archives/libva/2016-May/003923.html

As always we are the early enablers for most of the VA-API features :)
Here is the corresponding gstreamer-vaapi support patches:
https://cgit.freedesktop.org/~sree/gstreamer-vaapi/log/?h=vdenc

My initial test cases showing ~40-50% faster encoding.
This will really boost the live encoding use cases.

GuC firmware needs to be updated for SKL. 
Skylake GuC - 6.1: https://01.org/linuxgraphics/downloads/skylake-guc-6.1
OR
skl_guc_ver4_3: https://01.org/linuxgraphics/downloads/sklgucver43

How to update: https://01.org/linuxgraphics/intel-linux-graphics-firmwares
It is pretty easy.


I will push the patches (requires some minor changes) once the driver patches
land in master branch.

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