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[xine-devel] demux_ts: request concensus on pmt parser changes (long)
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From: Steve B. <sb...@co...> - 2002-04-15 17:49:36
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I'd like to integrate Andre' Drazik's changes for sections spanning multiple packets as well as add the missing support for multiple pmt sections in a single packet. The Telstar 5 transponder at 11898 thoughtfully provides a complete test case, attached. The one packet contains multiple pmt sections with the last section spanning to a subsequent packet which also contains multiple sections. It appears that the case of multiple sections per packet can be recognized by looking to see if a pmt table_id (02) follows a section successfully parsed. The last_section_number field seems to not be supported by this transponder, i.e. not 13818-1-3 compliant. It also appears that the case of a spanning section can be recognized when the section length extends past the end of the current packet or the remaining length of the packet is <3, (needed for the table_id and the section length). In this spanning case, the data needed to complete the section seems to immediately follow the section pointer in the next packet for this pid. The section pointer seems to point past the remaining data for the uncompleted section and to the start of the first section that begins in that packet. Both packets have pusi=1. I can't find references to this case in 13818 or its amendments. The implementation of the software section filter in the dvb card driver seems to agree. I'm reluctant to use the driver to filter sections as this would tend to limit xine to only satellite, not file input. I haven't found other si parser code that handles this. There has been some discussion over whether si parsing belongs in the input or demux code, but I need to fix this regardless. Hopefully some of the transport stream experts on the list can calibrate my assumptions. I don't have much experience with this. 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