mysql hooks

Hi, looks like a nice project. I already have a mysql
database that I'd like to use. Unfortuantely, not all
mp3s are required to be in a single directory. In fact,
to find the path of a given file requires two looks up.
The point being, I don't store the filename as a column.
Is it possible to overcome this - i.e. provide some hook
for computing filenames? Thanks

--ant