[vorbis-dev] Content identifier

Ralph Giles giles at xiph.org
Tue Jan 28 14:30:25 PST 2003

On Tuesday, January 28, 2003, at 10:17  pm, Linus Walleij wrote:

> This boils down to the fact that the namespace for Ogg codecs is simply
> 6 characters (or rather 6 bytes) and thats it. Sound reasonable, as the
> world will probably not be overly crowded with codecs after all 
> (atleast
> not the 256^6 that this scheme makes possible). AVI files settled for 4
> characters only if I'm not mistaken.

That's a subset of what the spec allows consistent with usage, yes.

Note that the speex magic is really 'speex   ' (8 bytes), and in all 
three codecs the magic is followed by a version marker which may at 
some point become important to distinguish. That's why I want to be 
vague about the number of bytes required for type determination.


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