[FFmpeg-devel] [PATCH v4 0/4] add ARIB caption decoder using libaribcaption

[TADANO Tokumei]

ping

The patch set has been well tested by Japanese ISDB-related developers and works fine.
I think it already has good quality to merge.

It requires external library like libaribb24, but the feature is disabled by default.
There is no impact to current code without `--enable-libaribcaption` option is
specified at configuration. The patch set provide better subtitle feature
for ISDB users than libaribb24 if enabled.

On 2022/05/30 23:55, TADANO Tokumei wrote:
> This patch set add another ARIB caption decoder using libaribcaption
> external library: https://github.com/xqq/libaribcaption
> The library decodes subtitles of ISDB-based TV broadcasting.
> It is not only for Japanese ARIB STD-B24 caption, but also for
> Brazilian ABNT NBR 15606-1 and Philippines version of ISDB-T.
> 
> 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, but it can
> be changed by `-sub_type` option.
> You can see ARIB caption with ffplay tool:
>    ffplay -sub_type bitmap MPEG.TS
> 
> Sample files exist under:
>    https://streams.videolan.org/streams/ts/ARIB/
> Some of them are encrypted and some don't contain ARIB caption data.
> Good samples for ARIB caption are:
>    brazil/07-25_20-33-35_UCV - HD_.ts
>    japan/channel2[137]_clear.ts
> 
> ---
> v4: reflect review results from outside of this ML.
>    - resize bitmap subtitle image to display fonts with correct aspect ratio
>    - multiple font families can be specified by '-font' option
>    - remove 'rendering_backend' option
>    - add document
>    - minor bug fixes
> v3: combine former 1/4 and 2/4 due to the patchwork shows build error.
> v2: combine former 1/5 and 2/5 due to the patchwork shows build error.
>    - fix help option content which incorrectly separated to 2 lines in 2/4.
>    - amend commit message of 4/4.
> 
> TADANO Tokumei (4):
>    lavc/libaribcaption.c: add ARIB caption decoder using libaribcaption
>    lavc/codec_desc.c: remove AV_CODEC_PROP_TEXT_SUB property
>    lavf/mpegts.c: set some properties for ARIB caption
>    doc/decoders.texi: add document of aribcaption decoder
> 
>   configure                   |    4 +
>   doc/decoders.texi           |   99 +++
>   libavcodec/Makefile         |    1 +
>   libavcodec/allcodecs.c      |    1 +
>   libavcodec/codec_desc.c     |    1 -
>   libavcodec/libaribb24.c     |    1 +
>   libavcodec/libaribcaption.c | 1137 +++++++++++++++++++++++++++++++++++
>   libavformat/mpegts.c        |   19 +-
>   8 files changed, 1261 insertions(+), 2 deletions(-)
>   create mode 100644 libavcodec/libaribcaption.c
>