linux下音频录音和播放程序源码，了解linux下的音频编程。-Under linux audio recording and playback program source code to understand the audio programming under linux.

调用Linux系统的ALSA声音系统API，完成PCM格式的wav文件的录音和播放。-these codes are capable to record sound into wavfile in PCM format and play wavfile in PCM format by callling ALSA API on Linux platform.