[ogg-dev] Fwd: Additional ogg audio fomats (speex, flac, PCM)
Timothy B. Terriberry
tterribe at xiph.org
Sat Jun 2 10:00:57 PDT 2012
clancy hood wrote:
> [Woops, forgot to reply to the list ; just sent the following to Ralph]
No worries, I've been doing this for years and I still managed to send
you my reply off-list. I hate that particular configuration of our lists.
> 1) It seems I can always rely on the first byte of the first vorbis
> comment page to be 3. Is this right?
> I see that some pages begin with a byte and then "vorbis", but haven't
> yet found a resource that tells me what that byte means.
This is explained in the Vorbis spec:
> 2) In fact, must page 2 of an ogg be a comment page, or may it be
> missing altogether? So far, I've found "empty" pages with a single page
> segment, but never a missing comment page.
The second packet of a Vorbis stream must always be a comment header. It
isn't legal to omit it. It can span multiple pages (and will sometimes
do so when people embed album art in it).
More information about the ogg-dev