[Bug 732266] vaapidecode: h264: add support for decoding SVC base layers only

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=732266

--- Comment #3 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Orestis Floros from comment #1)
> SVC streams proved to be a bit tricky. Following the same method I used in
> bug 732265 doesn't work and so I try to flag NAL units 14, 15 and 20 with
> GST_VAAPI_DECODER_UNIT_FLAG_SKIP in gst_vaapi_decoder_h264_parse().
> The problem I am facing right now is with the
> GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END flag.
> h264parse uses the whole stream and doesn't "detect" AU start and end
> correctly, this means that at_au_end is not reliable. 

If there is an issue with h264parse to correctly detect the AU, why can't we
try to fix that issue first(in h264parse)? 
IIUC from your comments, fixing h264parse to make the AU detection correct for
SVC will help to make the vaapih264dec patch simple enough like what you did
for #732265, right?

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