[ogg-dev] How Ogg mappings translate into the codecs parameter in Ogg media types

Conrad Parker conrad at metadecks.org
Wed May 28 18:20:43 PDT 2008

2008/5/28 ogg.k.ogg.k at googlemail.com <ogg.k.ogg.k at googlemail.com>:
>>> FLAC and CMML for example have version fields.
>> How many other "in-house" codecs have one?  This may be worth knowing.
> ogginfo should tell you. With -v, I get "Version: 0" for Vorbis streams.
> For Theora, I get 3.2.0.
> Which reminds me I've put a comment in liboggz's Theora BOS packet decoder
> where there's a possible off-by-one that needs someone with knowledge of the
> bitstream changes to ensure correct decoding. If anyone wants to have a go,
> look in oggz_auto.c, grep for 42.

This line?

  /* TODO: this should check against 42 for the relevant version numbers */
  if (op->bytes < 41) return 0;

> FWIW, though not in-house, Kate also has a version field.

Kate is in the house!


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