avdevice/decklink_dec: add support for decoding teletext from 10bit ancillary data
This also add supports for 4K DeckLink cards because they always output the
ancillary data in 10-bit.
v2:
- only try teletext decoding for 576i PAL mode
- some comments as requested by Aaron Levinson
Signed-off-by:
Marton Balint <cus@passwd.hu>
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