How to get the number of tracks on a disc?

Hi,

I was wondering if there is a usb call that can give me the number of tracks 
that's on a MD.

What I can do now is: try a getTrackName in a for loop from 0-256 and if one 
fails stop,
but it seems to me this could be done better if I can ask for the number of 
tracks.

This information is not hidden in the disc name is it? If it is: this would 
be quite stupid don't
you think? Maybe the disc name is corrupt e.g.

Martijn

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