[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 #66 from sreerenj <bsreerenj at gmail.com> ---
The problem here is that you set the nal units for SKIP, but returned from the
parse function without parsing and eventually with out setting the flags
(FRAME_START, FRAME_END etc). As a result, all of these non-annex-a nal units
get accumulated as pre_units of the GstVaapiParserFrame. Ideally, pre_units
shouldn't have the slice nals. But here we store the SLCE_EXT slice nal also in
preunits (even though it is set for skip).

Then later when ParserFrame gets unreferenced, it tries to invoke the
sps_clear() and pps_clear() assuming that the data has been parsed and stored
already.

That could be the reason you get the segfault in subset_sps handling. You may
have the similar issue with pps_clear too since  parse_pps just returns success
for GST_H264_PARSER_BROKEN_LINK.

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