[Bug 783804] New: encoder: h265(HEVC): Add multi reference support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783804

            Bug ID: 783804
           Summary: encoder: h265(HEVC): Add multi reference 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: ---

Currently we only support 1 ref frame in P frame encode and 2 ref frames in B
frame encode. With the recent changes in Intel-vaapi-driver(SKL, BXT and KBL
platforms), we should be able to use multi-referencing.


-- Query the driver with VAConfigAttribEncMaxRefFrames and find  the number of
reference frames supported.
Need a fix in driver:Currently the value is hard-coded in driver query
implementation.


-- Implement a basic algorithm in vaapih265encoder to utilize the multi
referencing.
For eg: use the previous frames(n-1, n-2...n-x, where n=current frame,
x=user-input-number-of-ref-frames-to-be-used) for referencing.

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