[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 #44 from Orestis Floros <orestisf1993 at gmail.com> ---
(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.

> 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.

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