3. 实现：

3.1 PAT表格定义如下：

typedef struct TS_PAT_Program
{unsigned program_number    :16;   //节目号unsigned program_map_PID   :13;   //节目映射表的PID，节目号大于0时对应的PID，每个节目对应一个
}TS_PAT_Program;

typedef struct TS_PAT
{unsigned table_id                     : 8; //固定为0x00 ，标志是该表是PATunsigned section_syntax_indicator     : 1; //段语法标志位，固定为1unsigned zero                         : 1; //0unsigned reserved_1                   : 2; // 保留位unsigned section_length               : 12; //表示这个字节后面有用的字节数，包括CRC32unsigned transport_stream_id        : 16; //该传输流的ID，区别于一个网络中其它多路复用的流unsigned reserved_2                   : 2;// 保留位unsigned version_number               : 5; //范围0-31，表示PAT的版本号unsigned current_next_indicator       : 1; //发送的PAT是当前有效还是下一个PAT有效unsigned section_number               : 8; //分段的号码。PAT可能分为多段传输，第一段为00，以后每个分段加1，最多可能有256个分段unsigned last_section_number          : 8;  //最后一个分段的号码std::vector<TS_PAT_Program> program;unsigned reserved_3                    : 3; // 保留位unsigned network_PID                    : 13; //网络信息表（NIT）的PID,节目号为0时对应的PID为network_PIDunsigned CRC_32                        : 32;  //CRC32校验码
} TS_PAT; 

3.3 解析代码如下：

HRESULT CTS_Stream_Parse::adjust_PAT_table( TS_PAT * packet, unsigned char * buffer)
{packet->table_id                    = buffer[0];packet->section_syntax_indicator    = buffer[1] >> 7;packet->zero                        = buffer[1] >> 6 & 0x1;packet->reserved_1                  = buffer[1] >> 4 & 0x3;packet->section_length              = (buffer[1] & 0x0F) << 8 | buffer[2]; packet->transport_stream_id           = buffer[3] << 8 | buffer[4];packet->reserved_2                    = buffer[5] >> 6;packet->version_number                = buffer[5] >> 1 &  0x1F;packet->current_next_indicator        = (buffer[5] << 7) >> 7;packet->section_number                = buffer[6];packet->last_section_number           = buffer[7]; int len = 0;len = 3 + packet->section_length;packet->CRC_32                        = (buffer[len-4] & 0x000000FF) << 24| (buffer[len-3] & 0x000000FF) << 16| (buffer[len-2] & 0x000000FF) << 8 | (buffer[len-1] & 0x000000FF); int n = 0;for ( n = 0; n < packet->section_length - 12; n += 4 ){unsigned  program_num = buffer[8 + n ] << 8 | buffer[9 + n ];  packet->reserved_3           = buffer[10 + n ] >> 5; packet->network_PID = 0x00;if ( program_num == 0x00){  packet->network_PID = (buffer[10 + n ] & 0x1F) << 8 | buffer[11 + n ];TS_network_Pid = packet->network_PID; //记录该TS流的网络PIDTRACE(" packet->network_PID %0x /n/n", packet->network_PID );}else{TS_PAT_Program PAT_program;PAT_program.program_map_PID = (buffer[10 + n] & 0x1F) << 8 | buffer[11 + n];PAT_program.program_number = program_num;packet->program.push_back( PAT_program );TS_program.push_back( PAT_program );//向全局PAT节目数组中添加PAT节目信息     }         }return 0;
}