查询cad扩展属性，即xdata属性，帮助数据分析。-Query cad extended attributes, that xdata properties that help data analysis.

DVB-CA系统的基本框架的学习； 学习TS流的结构，PSI信息分析。用软件进行TS流的PSI信息提取。 -Learning the basic framework of DVB-CA system learn the structure of the TS stream the PSI information analysis. PSI information extraction software TS stream.

DVB部分源码,可实现软件复用和Si分析,更详细的资料可在DTV相关网站查找-DVB part of source code, software reuse can be realized and the analysis of Si, more information is available in DTV related website search