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

[GStreamer (GNOME Bugzilla)]

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

Orestis Floros <orestisf1993 at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #353477|0                           |1
        is obsolete|                            |
 Attachment #354073|none                        |needs-work
             status|                            |

--- Comment #3 from Orestis Floros <orestisf1993 at gmail.com> ---
Created attachment 354073
  --> https://bugzilla.gnome.org/attachment.cgi?id=354073&action=edit
Current work with property and caps negotiation

This is my current work until now.
It still depends on attachment 353187 since bug 783588 is still unresolved.

The patch should handle cases (b.) and (c.) from comment 2. Another patch will
be submitted for (a.) in bug 732267.
With the current h264parse element a pipeline like this:
... h264parse ! vaapih264dec base-only=TRUE ! vaapisink
will make vaapih264 negotiate Annex-H profiles and drop the NON-ANNEX-A NALs
itself.
With base-only=FALSE negotiation fails.

An open issue is whether should we initialize base_only to TRUE if we negotiate
Annex-A profiles regardless of the property's value.

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