dvb/si: add the TTML subtitling descriptor - #71
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Extension descriptor 0x20 of ETSI EN 303 560, which signals a DVB TTML subtitle stream in the PMT: language, subtitle purpose, text-to-speech suitability, the TTML processor profiles the stream conforms to, and the optional presentation qualifier. Only the profile list sits at a fixed offset; the qualifier, the essential font list and the service description text each move with a count read out of the descriptor, so validate() walks them rather than checking a single length. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Extension descriptor 0x20 of ETSI EN 303 560, which signals a DVB TTML subtitle stream in the PMT: language, subtitle purpose, text-to-speech suitability, the TTML processor profiles the stream conforms to, and the optional presentation qualifier.
Only the profile list sits at a fixed offset; the qualifier, the essential font list and the service description text each move with a count read out of the descriptor, so validate() walks them rather than checking a single length.