Low Level Decoding

Modules
group	Character set conversion functions
	Helper functions to convert between Closed Caption, Teletext, Unicode and the locale character set.
group	DVB VBI demultiplexer
	Extracting VBI data from a DVB PES or TS stream.
group	DVB VBI multiplexer
	Converting VBI data to a DVB PES or TS stream.
group	Teletext IDL packet demultiplexer
	Functions to decode data transmissions in Teletext Independent Data Line packets (EN 300 708 section 6).
group	Teletext PFC packet demultiplexer
	Functions to decode data transmissions in Teletext Page Function Clear packets (EN 300 708 section 4).
group	Video Program System Decoder
	Functions to decode and encode VPS packets (EN 300 231, EN 300 468).
group	Extended Data Service (XDS) demultiplexer
	Separating XDS data from a Closed Caption stream (EIA 608).

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