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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 356825
  --> https://bugzilla.gnome.org/attachment.cgi?id=356825&action=edit
libs: encoder: h265: add multi reference support

This is doing the same as h264 encoder as the following:

Using num_ref_frames provided and the result of the Query
VAConfigAttribEncMaxRefFrames, it determines the size of reference list
and perform encoding with multi reference frames as the following:

1\ The num_ref_frames is being considered as the number of
reference picture list0
2\ Encoder adds 1 reference frame more to the reference picture list1
internally if b-frame encoding.
3\ If num_ref_frames is bigger than the number of refrence frames
supported in the driver, it will be lowered.

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