[Speex-dev] Codecs defined for OGG

[Ralph Giles]

On Wed, Jul 11, 2007 at 11:50:48PM +0800, Steve Underwood wrote:

> Is there a well recognised procedure for adding new codec formats to 
> ogg? If there is I'll probably add about 20-30 for the common speech 
> codecs, and arrive at one container file to handle everything we touch.

There's no official procedure. I'd suggest reading the Ogg documentation 
for pointers, especially http://xiph.org/ogg/doc/ogg-multiplex.html for 
suggestions on the granulepos. Then make it as much like existing 
encapsulations as possible. Post something at wiki.xiph.org and ask
here for review.

Main decisions are:

* magic string for codec identification
* header/codec setup information if any
* packetization
* granulepos scheme

Other examples:

http://xiph.org/vorbis/doc/Vorbis_I_spec.html#vorbis-over-ogg
http://wiki.xiph.org/index.php/CMML
http://wiki.xiph.org/OggDirac
http://wiki.xiph.org/OggMNG

HTH,
 -r