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add libaribb24 ARIB STD-B24 caption decoder

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* Outputs ASS lines with basic coloring and font scaling for each
  given region.
* Sets the default style to the resolution of the subtitle plane
  (for example, 960x540 / 36pt font for profile A).
* Has options to:
  * Disable ruby text (which is coded as regions which have
    half-height text in libaribb24).
    Enabled by default as without positioning ruby text only
    confuses as it is usually coded in the beginning of the decoded
    subtitle line.
  * Set the working directory, in which libaribb24 will read
    configuration as well as into which it may save broadcast extra
    symbols as PNG.
    Unset by default.

The unconventional library check can be explained by the library's
current master branch being licensed as LGPLv3, but at the time of
writing the latest official release is still licensed under GPLv3.

Thus, one either has to wait for the following release, or enable
GPLv3.
This commit is contained in:
Jan Ekström
2019-01-14 21:52:23 +02:00
parent 5c515b5f7d
commit 100bfac6d6
11 changed files with 438 additions and 2 deletions
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1
libavcodec/allcodecs.c
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@@ -677,6 +677,7 @@ extern AVCodec ff_qdmc_at_decoder;
extern AVCodec ff_qdm2_at_decoder;
extern AVCodec ff_libaom_av1_decoder;
extern AVCodec ff_libaom_av1_encoder;
extern AVCodec ff_libaribb24_decoder;
extern AVCodec ff_libcelt_decoder;
extern AVCodec ff_libcodec2_encoder;
extern AVCodec ff_libcodec2_decoder;