[Bug 732265] vaapidecode: h264: add support for decoding MVC base views only

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=732265

--- Comment #2 from sreerenj <bsreerenj at gmail.com> ---
This task is assigned to Orestis and he is doing it as a part of Google Summer
of Code 2017.

Let's discuss about the possible cases.


  a: vaapih264dec only advertise the Annex-A profiles if there is no MVC decode
support in hardware , and h264parse should drop all NON-ANNEX-A NAL units if
pipeline is ".. ! h264parse ! vaapih264dec !..."
The negotiated profile will be Annex-A profile in this case.

  b: The pipeline ".. ! demuxer ! vaapihh264dec !.." will fail if there is no
hw capability to decode MVC, Because the decoder advertise the support for
Annex-A but demuxer report MVC profile.Which means there is no one to drop the
NON-Annex-A NALs.
There is no negotiated profle in this case, because negotiation failed.

  c: The pipeline ".. ! demuxer ! vaapihh264dec !.." will work even if there is
no hw capability to decode MVC If and Only if the user explicitly enable
base-only=TRUE.
The negotiated profile will be Annex-H profile in this case, because we
forcefully enable the dropping. If we try to negotiate Annex-A profile, there
is no guarantee about the capability of upstream element to drop NON-ANNEX-A
NALs.

There are different combinations possible like the above. Any better
suggestions?

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