Linux下基于libmad的mp3播放程序，修改了自带的minimad，重定义了putchar，向真正的音频设备输出。-Linux under the libmad based mp3 player, modify the built-in minimad, re-define putchar, to the real output of audio equipment.

基于Linux的MP3播放，根据libmad里面的minimad来实现的MP3播放-Linux-based MP3 player, according to which the minimad libmad MP3 player to achieve

mp3的测试代码，在linux环境中已经运行通过，用./minimad <*.mp3> test.pcm 然后./pcm_play test.pcm 即可 -mp3 test code in linux environment has been run through, use./minimad < *. mp3> test.pcm then./pcm_play test.pcm can