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avformat/rcwtdec: add RCWT Closed Captions demuxer

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RCWT (Raw Captions With Time) is a format native to ccextractor,
a commonly used OSS tool for processing 608/708 Closed Captions (CC).
RCWT can be used to archive the original extracted CC bitstream.
The muxer was added in January 2024. In this commit, add the demuxer.

One can now demux RCWT files for rendering in ccaption_dec or interop
with ccextractor (which produces RCWT). Using the muxer/demuxer combo,
the CC bits can be kept for processing or rendering with either tool.
This can be an effective way to backup an original CC stream, including
format extensions like EIA-708 and overall original presentation.

Signed-off-by: Marth64 <marth64@proxyid.net>
This commit is contained in:
Marth64
2024-04-02 00:24:54 -05:00
committed by Stefano Sabatini
parent dfd9c21754
commit 15406f8377
5 changed files with 155 additions and 0 deletions
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libavformat/allformats.c
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@@ -391,6 +391,7 @@ extern const FFInputFormat ff_qoa_demuxer;
extern const FFInputFormat ff_r3d_demuxer;
extern const FFInputFormat ff_rawvideo_demuxer;
extern const FFOutputFormat ff_rawvideo_muxer;
extern const FFInputFormat ff_rcwt_demuxer;
extern const FFOutputFormat ff_rcwt_muxer;
extern const FFInputFormat ff_realtext_demuxer;
extern const FFInputFormat ff_redspark_demuxer;