[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 #21 from sreerenj <bsreerenj at gmail.com> ---
One access unit can have multiple view components, and yes you don't have to
add the slice_ext in the code for checking the complete_au. Sorry about the
confusion.
But ideally, we should add other checkings like "compare the view_ids of nals"
for vcl boundary detection (even though current code can work without that).


BTW I hit a segfault issue while testing your branch:

Generate an mvc sample like this: 
gst-launch-1.0 -v videotestsrc num-buffers=30 blocksize=115200 ! vaapih264enc
num-views=2 ! video/x-h264, profile=stereo-high ! filesink location=sample.mvc

playback the stream with only base view
gst-launch-1.0 filesrc location=sample.mvc ! h264parse ! vaapih264dec
base-only=true ! vaapisink

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