说明：  基于ALSA的WAV播放和录音程序完整源码，程序包包含四个部分：WAV Parser、SND Common、Playback和Record。WAV Parser是对WAV文件的分析和封装，这里只针对Standard WAV File；SND Common是Playback 和Record共同操作，如SetParams、ReadPCM和WritePCM等；Playback和Record就分别是播放录音的主体了。原理很 简单，以Playback为例：从WAV文件读取PCM数据，通过I2S或AC97依次送到Audio Codec。
(Based on the integrity of the source code of the ALSA WAV playback and recording procedures, the package contains four parts: Parser WAV, SND Common Playback and Record. WAV Parser WAV files and package, only for Standard WAV File the the SND the Common Playback and Record co-operation, such as SetParams, ReadPCM, and WritePCM Playback and Record are the main body of the playback recording. The principle is very simple, Playback example: turn sent via I2S or AC97 Audio Codec PCM data read from the WAV file.)