[vorbis-dev] Metadata streams

Gregory Maxwell greg at linuxpower.cx
Thu Apr 12 06:55:40 PDT 2001

On Thu, Apr 12, 2001 at 09:30:46AM -0400, Martin C. Martin wrote:
> On Wed, 11 Apr 2001 rillian at telus.net wrote:
> > What sorts of metadata applications are you interested in? I've tried to 
> > collect what requirements I can, but most people don't have much to 
> > say...
> Our project is making a mod for Unreal Tournament to take out the
> shooting and turn it into a 3D virtual nightclub.  Think of it as chat
> with live audio, dancing, powerups, etc.  Or think of it as a social MUD
> with a 3D intefafce and music.
> The dancing will be similar to Dance Dance Revolution, Parappa the
> Rapper, Space Channel 5, etc.  Basically, you need to press certain
> buttons on the beats of the music.  So, we need to know where the bars
> begin and end.  Extracting that from music is an unsolved problem (in
> general), so it'll have to be extracted before hand, with a user's help,
> and stored in the file.  We'll also need to know which parts are chorus,
> verse, and bridges without a beat.
> In addition, we might add some sort of lighting information, controls
> for a scripted band, special effects, a stage show, etc.  Since the
> types of info may evolve, it needs to all be backward compatible, and
> there could potentially be a large number of very-low-datarate "streams"
> here.
> Our plan is to have two logical streams, one for the vorbis data, one
> for everything else.  In the "everything else" stream, the first four
> bytes of every packet will be a "type" field.  That way, we don't need a
> separate stream_state for every type (a hastle), and we only need to
> incur one page header for all the extra info combined, not every
> individual type.

The ability to embed this type of information would actually be very helpful
for me in doing lighting and show control for meat-space events.

(Virtual nightclubs? It's a sad sad world. :P )

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