作者：华清远见嵌入式学院。《Linux设备驱动开发详解》（08&09年度畅销榜TOP50）第17章、Linux音频设备驱动。在Linux系统中，先后出现了音频设备的两种框架：OSS和ALSA，本节将在介绍数字音频设备及音频设备硬件接口的基础上讲解OSS和ALSA驱动的结构。17.1～17.2节讲解了音频设备及PCM、IIS和AC97硬件接口。17.3节讲解了Linux OSS音频设备驱动的组成、mixer接口、dsp接口及用户空间编程方法。17.4节讲解了Linux ALSA音频设备驱动的组成、card和组件管理、PCM设备、control接口、AC97 API及用户空间编程方法。17.5节以S3C2410通过IIS接口外接UDA1341编解码器的实例讲解了OSS驱动。17.6节以PXA255通过AC97接口外接AC97 编解码器的实例讲解了ALSA驱动。-Author: HuaQing vision embedded institute. The Linux device driver development "(08 and 09 sep TOP50) annual list of best-selling chapter 17, Linux audio device drivers. In Linux system, the audio equipment successively appeared two framework: OSS and ALSA, this section will be introduced in digital audio equipment and audio equipment and hardware interface on the basis of OSS and explain the structure of the driver ALSA. 17.1 ~ 17.2 explained audio equipment and PCM, IIS and AC97 hardware interface. Section 17.3 explained Linux OSS audio device driver s composition, mixer, DSP interface and the user interface space programming method. Section 17.4 explained Linux ALSA audio device drivers, the composition of the card and the component management, PCM equipment, control interface, AC97 API and user space programming method. Section 17.5 to S3C2410 through the IIS interface external UDA1341 codec examples to explain the OSS driver. Section 17.6 to PXA255 through the AC97 interface exter