[Bug 773863] decklinkvideosrc: add VANC parsing

[GStreamer (GNOME Bugzilla)]

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

--- Comment #30 from John Poet <jppoet at gmail.com> ---
I have a lot of "helper" functions not included in these patches (yet). I had
planned on these functions being part of libgstvanc.  If libgstvanc is removed,
where would you like them?

These functions facilitate parsing captions from the ancillary data, so they
can be injected into the ffmpeg user data.

Technically, I have a "helper" class which is currently written in C++.  I am
getting a strong hint that you are going to make me port it to 1990 era C.  I
am not looking forward to that, but I understand your reasons.  As I am sure
you have figured out, before this project I had not written C code in about 25
years.

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