[Bug 783803] encoder: h264(AVC): Add multi reference support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783803

Hyunjun Ko <zzoon at igalia.com> changed:

           What    |Removed                     |Added
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 Attachment #356501|reviewed                    |none
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--- Comment #22 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 356764
  --> https://bugzilla.gnome.org/attachment.cgi?id=356764&action=edit
libs: encoder: h264: add multi reference support

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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