help output function

Hi everybody, this is my first post, I'm a spanish
student and I'm doing my final career proyect, this is
a mp3 player and I'm using libmad. 
I'm studing the minimad.c but I dont know how the
output function works, I've tried the mpg321 output
function and it works better but I can't understand
what it really do. It doesnt open /dev/dsp, does it? 

please I need I little bit of help

thanks all

Jorge Suarez-Solis Rivaya


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