mp3 decoder and encoder..( How can we play a song in c/c++)

All i want is to learn how winamp is able to play a song.....? How is it possible to encode a song and decode a song.... How does it encode this binary coding form of the song...and how does it decode...it Is it possible to play a song in c/C++ environment... i mean can an mp3 be played in c/c++ .... if yes how? ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform win98 as operating system.. 256 ram p3 as processor