[Bug 796984] vaapih265enc: Support hevc encode low latency B frame.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796984

--- Comment #14 from Fei <fei.w.wang at intel.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #12)
> Another question is, if  https://github.com/intel/libva/pull/220 is merged,
> this property should be moved to the base encoder class, since it will apply
> to all the codecs?
> 
> Is there any use case where a user would want to enable this option even it
> their backend supports P frames?

It won't break other backend after the libva patch merged. And we need to query
if hardware support low latency B in gst-vaapi, if not, then break out and
print to user the reason.

We can consider to move this property to base class in next step. AFAIK, this
feature only benefit on none-p frame supported platforms.

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