On Monday 09 July 2001 22:21, Carsten Neumann wrote:
> On Mon, 09 Jul 2001, Alex Miller wrote:
> > It made a new cd. Wonderful. But when I play it
> > with the gnome cd player, the album title and
> > track title appear as they did on the original CD.
> >
> > I don't understand how that happened? Do .wav
> > files contain text? Do they contain cddb info?
> > I thought a .wav file was just sound information.
>
> If I'm not completely wrong the gnome cd player supports CDDB.
> The `ID' of a CD is derived from its total play length - taken as a hash
> value - and is used to look up the CD's data (volume and track names) at
> the CD data base on a CDDB server on the internet.
>
> Therefore if you don't change the total length of a copied CD you will get
> the same ID.
>
> Did I miss something?
>
WOW! I thought I was going crazy. So my empirical
experiment was telling me the truth, the wav files
are all that is needed to derive the lyrics, but because
I had no explanation, I could not believe the empirical
results.
So, if I make an audio CD of my friend's .wav files,
I can "submit" the values to the CD database.
I would think that total length would be insufficient for a signature,
but perhaps some hash value generated from some function
across the tracks. That is, if you substitute the 7th track with
another track with the same length, the total lenght is the same
but a function of the whole CD would be different.
This is very interesting.
Alex Miller
> Kind regards
>
> Carsten
>
>
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