ogg dev - Aug 2007 - Re: Embedding int32's within threora & vorbis files

On 8/8/07, Ian Malone <ibmalone@gmail.com> wrote:
> On 08/08/07, Paul Griffiths <gafferuk@gmail.com> wrote:
> > Hi, i need to include a discontinuous stream of in32's(3 at a
time) to vorbis
> > and theora ogg files, to be played back on time.
> >
> > Does anyone have an example I can work from?
> >
> > I would love to say what it is for but I have to be careful of
comptition at
> > this early stage.
> >
>
> If I understand correctly you want to store integers
> in the Ogg stream at some synchronisation with
> other contents (Vorbis, Theora).
Correct.  You define a discontinuous 'codec' and a 'mapping'
that
specifies how it is embedded in the Ogg stream.  This makes sure it is
only used by software that recognizes what it is.
> Possibly OggPCM
> would suit,
No.  OggPCM is, I think, defined to be continuous and definitely
defined to be audio.
> you probably want to look at defining an
> application specific mapping so that no player would
> attempt to play the (presumably) non audio stream.
Exactly.

Monty

On 08/08/07, xiphmont@xiph.org <xiphmont@xiph.org>
wrote:
> On 8/8/07, Ian Malone <ibmalone@gmail.com> wrote:
> > On 08/08/07, Paul Griffiths <gafferuk@gmail.com> wrote:
> > > Hi, i need to include a discontinuous stream of in32's(3 at a
time) to vorbis
> > > and theora ogg files, to be played back on time.
> > >
> > > Does anyone have an example I can work from?
> > >
> > > I would love to say what it is for but I have to be careful of
comptition at
> > > this early stage.
> > >
> >
> > If I understand correctly you want to store integers
> > in the Ogg stream at some synchronisation with
> > other contents (Vorbis, Theora).
>
> Correct.  You define a discontinuous 'codec' and a
'mapping' that
> specifies how it is embedded in the Ogg stream.  This makes sure it is
> only used by software that recognizes what it is.
>
> > Possibly OggPCM
> > would suit,
>
> No.  OggPCM is, I think, defined to be continuous and definitely
> defined to be audio.
>
That makes sense.  The spec for this new codec could
probably be copied almost wholesale from OggPCM.
The only obvious change needed is to redefine sample
rate to simply providing a granulepos mapping.

-- 
imalone

Thanks for the info, been looking at OggPCM wiki, but where can I get at the 
source? I can't use cvs on this machine so a direct link would be great.