[FFmpeg-devel] Rework and move timecode API to lavutil

[Clément Bœsch]

Hi,

The timecode API needed to be reworked due to the evolving usage, so here is a
more flexible implementation. It is also now public due to multiple demands, and
also moved from libavcodec to libavutil (it has usage in libavformat, libavcodec
and libavfilter).

The main benefit are:
 - more consistent API (function naming and usage)
 - can now be used unconditionally in lavfi
 - can now honor more flags than the drop frame one (see patch 07).
 - related to the previous point: the flags can obviously be extended.
 - simpler way to extract the GOP timecode (see patch 2 and 3)

Feel free to comment,

Regards,