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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #11 from Hyunjun Ko <zzoon at igalia.com> ---
(In reply to Hyunjun Ko from comment #10)
> > 
> > @@ +2023,3 @@
> > +      GST_VAAPI_ENTRYPOINT_SLICE_ENCODE);
> > +
> > +  if (base_encoder->max_num_ref_frames_1 < 1 && encoder->num_bframes > 0) {
> > 
> > To simplify this comparison, gst_vaapi_encoder_ensure_max_num_ref_frames()
> > should return FALSE if this happens.
> > 
> > Also, happens in H264
> 
> I like this approach, I'm going to provide another patch for this. Thanks!

Unfortunately, num_bframes is private for h264/5, which means
gst_vaapi_encoder_ensure_max_num_ref_frames can't access the variable.

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