[mad-dev] Mad winamp plugin bug

Sorry to post twice in a row, but I've now got a more specific question.

I've been looking at the mad winamp plugin source code, and I've worked out what causes the bug. When winamp tells the plugin to seek it basically calculates a file position to seek to by doing:-

(seekpos / song length) * (filelength).

This works with CBR files but not with VBR files as they have different data rates throughout the files.

I assume that the mad library seeks correctly and I would like to be able to use it to do the seeking with the winamp plugin (as my alternative would be to cludge it by reading frames from the beginning of the file until I got to the right time). Any pointers on what functions I could use in the library?