通过mp3解码器解码，并将解出的pcm码通过openal播放-Through the mp3 decoder decoding, and solved through the pcm code openal player

用ffmpeg解码，openAL播放声音的控制台程序，程序很小很好懂，可播放mp3,wav-Using ffmpeg decoding, openAL play a sound console program, the program understands very little good that can play mp3, wav