说明：  codec engine和xdm是TI DAVINCI系列处理器开发环境中的重要组成部分。本文章是作者阅读了大量TI文档后对这两者的工作原理和如何利用这两个工具进行DSP算法开发的一个全面透彻但很容易理解的分析，包含了作者很多的心血。
(xdm is a codec engine, and TI DAVINCI processor development environment an important component of the. The author of this article is to read a lot of these TI documents, after the work of the two principles and how to use these two tools for DSP algorithm development of a comprehensive and thorough but easy to understand analysis, the author includes a lot of hard work.)