[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 #45 from sreerenj <bsreerenj at gmail.com> ---
(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)?


> 
> > Here the non-base view having field macroblocks.
> > If the slice heder in base view still reference to the non-base view nals
> > (subset-sps or pps) , there could be two possible reasons:
> > 
> > 1: nalparser override the sps with subset sps since both have the same id.
> > Or
> > 2: stream is wrongly encoded
> 
> Yes, (1.) is true, forgot to mention it.
Then the ideal fix should go into h264parse I believe :)

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