[Bug 788918] vaapi: supports hierarchical prediction encoding

[GStreamer (GNOME Bugzilla)]

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

--- Comment #7 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 361493
  --> https://bugzilla.gnome.org/attachment.cgi?id=361493&action=edit
libs: encoder: h264: Add Hierarchical-P encode

Frames are encoded as differnt layers. A frame in a particular
layer will use pictures in lower or same layer as references.
Which means decoder can drop the frames in upper layer ,but still
decode lower layer frames.

eg: with 3 temporal layers

T3:             P1            P3              P5              P7

T2:                   P2                              P6

T1:   P0                                P4                        P8

T1, T2, T3: Temporal Layers
P1...pn:   P-Frames:
P0->P1 , P0->P2, P2->P3, P0->P4......repeat

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