[Bug 734093] vaapidecode: allow for per-codec element split

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=734093

--- Comment #43 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
As discussed on IRC (2016-09-02):

13:05:06    ceyusa    the question is if we should merge wm3 and vc1 into a
single element
13:05:13    ceyusa    or keep it split
13:05:16    slomo    are they always coming together? :)
13:06:18    sree_    :), why libav has separate elements?
13:06:53    slomo    they are different codec ids in ffmpeg
13:07:56    ceyusa    which is not the case in libva
13:08:16    slomo    then they should probably be the same element
13:08:27    slomo    iirc only one of the wmv3 profiles was compatible with vc1
though
13:08:41    __tim    maybe ad-n770 has an opinion :)
13:09:43    __tim    are there some subtle differences perhaps from before vc1
was standardised? I remember somewhere we had to pass through some extra
'fourcc' info so the decoder can do the right thing based on that
13:11:12    ad-n770    VC1 simple/main profiles are roughly the same as WMV3
Simple/Main profiles
13:11:20    sree_    wm3 == simple and main prfoile , wvc1 = advanced profile:
All are supported in SMPTE as VC1 codec ... And AFAIK, wmva is what not
supported in vc1
13:11:31    ad-n770    diferences come in the advanced profile
13:11:42    sree_    yup :)
13:12:05    sree_    WMVA is not supported by vaapi
13:12:30    ad-n770    yes, wmva is the issue, it's pre standard VC1 advanced
profile
13:12:49    sree_    So I go for "vaapivc1dec" single element ,
13:13:49    ad-n770    I think this should be fine
13:13:54    ceyusa    ok
13:14:15    slomo    that's also what i remember, yes. i think gst-omx does the
same

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