[Bug 788918] vaapi: supports hierarchical prediction encoding

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788918

--- Comment #4 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 361489
  --> https://bugzilla.gnome.org/attachment.cgi?id=361489&action=edit
libs: encoder: h264: Add machinery for implementing  hierarchical-prediction

Adds some basic building blocks to ease the implementation
of hierarchical prediction modes.

-- add an utility method to find temporal level of each frame
-- define max_ref_frame count based on temporal level count
-- add temporal_level_div[] for finding temporal level each frame
to be encoded.
-- find ip_period based on temporal level count

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