ogg dev - May 2008 - How Ogg mappings translate into the codecs parameter in Ogg media types

On 5/28/08, Silvia Pfeiffer <silviapfeiffer1 at gmail.com>
wrote:
> Hope this clarifies what I am suggesting.
It did.  Thank you.
> FLAC and CMML for example have version fields.
How many other "in-house" codecs have one?  This may be worth knowing.

-Ivo

>> 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.

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

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!

K.