[Bug 742922] vaapidecode: support reverse playback

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742922

--- Comment #38 from Hyunjun Ko <zzoon at igalia.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #33)
> Another alternative is to modify GstVideoDecoder to push the current
> gathered_list even if it is not a complete GOP, maybe with some NULL buffer
> or something.

@Victor,
I tried this idea, but I think the result wouldn't be that different from only
key frame decoding.
The thing is that we should push buffers in reverse order, which means that we
should decode all frames from key frame.
If we want to show more frames(probably 2-3 frames more), we could do inside
vaapi within surface capacity. But I don't think it's real improvement from
only key frame decoding.

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