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lavc/libaribcaption.c: add ARIB caption decoder using libaribcaption

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This patch add another ARIB caption decoder using libaribcaption
external library.

Unlike libaribb24, it supports 3 types of subtitle outputs:
* text: plain text
* ass: ASS formatted text
* bitmap: bitmap image

Default subtitle type is ass as same as libaribb24.
Advantages compared with libaribb24 on ASS subtitle are:
* Subtitle positioning.
* Multi-rect subtitle: some captions are displayed at different
  position at a time.
* More stability and reproducibility.

To compile with this feature:
* libaribcaption external library has to be pre-installed.
  https://github.com/xqq/libaribcaption
* configure with `--enable-libaribcaption` option.

`--enable-libaribb24` and `--enable-libaribcaption` options are
not exclusive. If both enabled, libaribcaption precedes as
order listed in `libavcodec/allcodecs.c`.

Signed-off-by: rcombs <rcombs@rcombs.me>
This commit is contained in:
TADANO Tokumei
2023-02-23 19:17:15 +09:00
committed by rcombs
parent 38bb137e99
commit b6138633cd
6 changed files with 1329 additions and 0 deletions
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2
libavcodec/allcodecs.c
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@@ -759,6 +759,8 @@ extern const FFCodec ff_pcm_mulaw_at_decoder;
extern const FFCodec ff_qdmc_at_decoder;
extern const FFCodec ff_qdm2_at_decoder;
extern FFCodec ff_libaom_av1_encoder;
/* preferred over libaribb24 */
extern const FFCodec ff_libaribcaption_decoder;
extern const FFCodec ff_libaribb24_decoder;
extern const FFCodec ff_libcelt_decoder;
extern const FFCodec ff_libcodec2_encoder;