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

[Silvia Pfeiffer]

Hi all,

I am trying to set up the codecs table in the wiki and we have played
a bit with Dirac to find out what existing tools write into the
header.

The Schroedinger implementation by Fluendo uses (or used to use)
"KW-DIRAC" as the identifier in the Ogg header.
"BBCD" is the identifier of each of the Dirac data packages.

More recently, I read that the Dirac Sequence header will be used as
the Ogg BOS packet directly.

I'm not sure this is the best solution and I'm not sure this is a
final decision either.

I believe it has to be sorted out properly and would suggest that
until such time we take the Dirac "codecs" specification out of this
Internet-Draft.

Comments welcome!

Cheers,
Silvia.


On Sat, May 31, 2008 at 2:20 AM, Ivo Emanuel Gonçalves
<justivo at gmail.com> wrote:
> I received the following comment regarding the table:
>
>> The table contains a mix of octal and hexadecimal 'escape sequences'
>> for non-printable / non-ASCII octets.
>> I strongly suggest to only use a single kind of numerical escapes.
>
> Is this feasible or even desired, or should we leave things as they are?
>
> For reference, this is how the table looks right now:
>
> Codec Identifier             | Codecs Parameter
> -----------------------------------------------------------
>  char[5]: 'BBCD\0'            | dirac
>  char[5]: '\177FLAC'          | flac
>  char[7]: '\x80theora'        | theora
>  char[7]: '\x01vorbis'        | vorbis
>  char[8]: 'Speex   '          | speex
>  char[8]: 'OggMIDI\0'         | midi
>  char[8]: 'CMML\0\0\0\0'      | cmml
>  char[8]: '\211PNG\r\n\032\n' | png
>  char[8]: '\212MNG\r\n\032\n' | mng
>  char[8]: '\213JNG\r\n\032\n' | jng
>  char[8]: 'CELT    '          | celt
>  char[8]: 'PCM     '          | pcm
>  char[9]: '\x80kate\0\0\0\0'  | kate
>  char[9]: 'YUV4MPEG2'         | yuv4mpeg
>
> (Don't expect it to look pretty without a monospaced font)
>
> -Ivo
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