[ogg-dev] OggPCM2 : chunked vs interleaved data

Conrad Parker conrad at metadecks.org
Tue Nov 15 19:09:13 PST 2005

On Wed, Nov 16, 2005 at 10:38:43AM +1100, Jean-Marc Valin wrote:
> > One obvious thing that seems to be lacking is the granulepos mapping. As 
> > suggested in Ogg documentation, for audio a simple sampling frame number 
> > ought to suffice, but I think the convention should still be spelled 
> > out.
> I was under the (maybe wrong) impression that the Ogg spec already
> covered everything that's needed for granulepos. If that's not the case,
> please suggest some text.

I added text to the "OggPCM" draft on Friday clarifying the granulepos
mapping, and incorporating the terminology for audio frames that Erik
suggested in email earlier last week. I also incorporated there the
constraint on OggPCM packets that Erik had suggested (that frames not be
split across packets). So, feel free to copy those sections across to
the new draft.

The Ogg spec doesn't specify what unit of time a granule is, only that
it is monotonically increasing between data packets.


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