这个是专门用来分析ts流PSI信息的filter，可以分析PAT表、PMT表，及相应的PID值。-The PSI Parser filter receives Program Specific Information (PSI) from an MPEG-2 transport stream and extracts program information from the Program Association Table (PAT) and Program Map Tables (PMT). This information enables an application to configure the MPEG-2 Demultiplexer. The filter supports a custom interface, IMpeg2PsiParser, for retrieving the PSI information.