Mathieu Dube wrote:

is there some kind of documentation on how to use mad for decoding mp3s or is there only the code and headers(mad.h)?

The file `minimad.c' that comes with the distribution shows how to use the high-level API.

In addition, Bertrand Petit has created a demonstration that shows how to use the low-level API:

http://www.bsd-dk.dk/%7Eelrond/audio/madlld/

If you have other questions, I suggest joining the mad-dev mailing list and asking them there.

Cheers,