[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 #47 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Orestis Floros from comment #46)
> (In reply to sreerenj from comment #45)
> > (In reply to Orestis Floros from comment #44)
> > > (In reply to sreerenj from comment #43)
> > > > If we already removed subset_sps and considering only base layer, none of
> > > > the slice header should reference to subset_sps.
> > > 
> > > But we don't remove subset sps's before parsing them, without the check
> > > h264parser's nalparser is updated.
> > 
> > 
> > IIRC, you were handling this stuff in your h264parse by invoking the parse
> > api without nalparser.  Why can the same be utilized here(if you have to
> > parse the subset_sps)?
> 
> Yes, this is what I am doing here too. For SVC subset sps I only call
> gst_h264_parse_sps() that doesn't use the nalparser. The problem is (from
> comment #33) that I don't do that for MVC streams because they don't play
> nicely with this for some reason (as I mention in comment #42).
> 
Make sure  the code never using mvc parsed data somewhere.

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