[Bug 773863] decklinkvideosrc: add VANC parsing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773863

--- Comment #5 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to John Poet from comment #4)
> There is still quite a bit needed.  The basic support for grabbing the VANC
> data from the decklink API is there, but that data further decoded into
> caption data, so those captions can then be processed by the mpeg2 encoder. 
> VANC can have a lot of other data besides Closed Captions, and there is some
> basic support for extracting those other types there in case someone wants
> to expand on this work.

Let's keep this simple and a step-by-step approach.

I would suggest that we get the GstMeta and decklink parts in already, and then
discuss the next parts about actually using the meta (and having decoding
functions, etc) as a next step in another bug.

Also for decoding we should not depend on gst-libav/ffmpeg (unconditionally) as
that will make it not usable for a big fraction of users who can't ship ffmpeg.

> This tells me that I am not adding the VANC metadata correctly, but I have
> not been able to figure out what I am doing wrong.

Yes that sounds like it. Adding another meta to a buffer should never affect
any other metas, it's just an array of metas in the end and you can even add
the same meta multiple times.


If you agree with what I said above, let's get the meta and decklink part in as
a first step, and get those parts work correct first :) Can you attach 2-3
patches for that here? That's easier for review then

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