[FFmpeg-devel] Add mpeg user_data CEA-608/708 extraction.

[Daniel Kristjansson]

This patch pulls CEA-608 and 708 data from the user data and puts it
in atsc_cc_buf buffer attached to each frame. The data passed in
atsc_cc_buf is CEA-708-D caption packets for both data encoded using
the ATSC user data and the SCTE-20 user data encodings. An example
of how to decode this for display is present in MythTV, ccextract,
etc.

-- Daniel
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