How to get the length of a file opened with Mix_LoadMUS

SDL Development
1

Hello,

I would like to know the lenght of a file opened with Mix_LoadMUS().
I think that one way is so use the structure Mis_Music, and especially the Mix_MusicType struct called data, but i can’t acces it, as it was reported here : http://www.libsdl.org/pipermail/sdl/2002-December/051230.html,
does anyone find a way to access data ?

Thanks.

bye