[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 #13 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Orestis Floros from comment #12)
> (In reply to sreerenj from comment #11)
> > You are almost there :)
> > 
> > For MVC and SVC, Prefix NALs should always come before a base layer slice
> > nal.  H264parse code is not dealing it correctly. 
> > As you said "complete = xxxx" shouldn't include the prefix-nal checking.
> > On top of that, the picture_start finding should include the prefix nal and
> > the slice extension nal.
> 
> Actually, we can completely skip prefix nal units when searching for the
> next nalu, nnalu, in SVC streams. This way we can end the au when
> first_mb_in_slice == 0 for the associated slice unit.

Yup.

> 
> That said, if h264parse AU detection is faulty for SVC streams shouldn't the
> same apply to MVC streams as well?

Yes, it should be broken for MVC too.

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