MPEG PS和TS格式介紹

1、PS/TS introduction 1. TS (Transport stream) introduction2. PS (Program stream) introduction3. Some examples4. Q&ATS introduction - some featuresTS is a stream for communicating or storing one or more programs and other data in environments in which significant errors may occurTS may be either fi

2、xed or variable rate, TS rate is defined by the values and locations of PCRTS is made up of TS packets, each are 188 bytes in length*PCR : Program Clock ReferenceTS introduction - TS packet(1) TS packet begin with a 4 byte prefix, which contains a 13-bit PID PID identifies the contents of the data c

3、ontained in the TS packet via PSI table There are 4 PSI tables 1. Program Association Table (PAT) 2. Program Map Table (PMT) 3. Conditional Access Table (CAT) 4. Network Information Table (NIT)*PID: Program ID, PSI: Program specific informationTS introduction - TS packet(2)*See ISO 13181-1 Table 2-3

4、TS introduction - TS packet(3)*See ISO 13181-1 Table 2-2TS introduction - TS packet(4)sync_byte a fixed 8 bit field, value is 0 x47transport_error_indicator 1 indicates that at least 1 uncorrectable bit error exists in the associate packet payloadpayload_unit_start_indicator * to PES packet,1 indica

5、tes this packet payload is a start of this PES packet * to PSI data, 1 indicates this packet payload is a start of current PSI data * to empty packet, always is 0transport_priority 1 indicates this TS packet has a greater priority than otherPID indicates the type of stored data in packet payload*PES

6、: Packetized Elementary Stream TS introduction - TS packet(5)transport_scrambling_control indicates the scrambling mode of TS packet payload, 00 - not scrambled, 01 to 11 - user defined adaptation_field_control indicates the TS packet header whether is followed with an adaptation field or/and payloa

7、d 00 - reserved by ISO 13818-1, 01 - not adaptation field, payload only 10 - adaptation field, not payload, 11 - adaptation field followed by payloadcontinuity_counter incrementing with each TS packet with the same PID, to adaptation_field_control is 00 or 01, isnt incrementeddata_byte continuous by

8、te from PES packet, PSI sections, stuff packet or user private data TS introduction - parsing TS processTS introduction - PCRTS introduction - PAT*See ISO 13818-1 TS introduction - PMT(1)See ISO 13818-1 Table 2-28TS introduction - PMT(2)See ISO 13818-1 Table 2-29TS introduction - PCRSee ISO 13818-1

9、Table 2-6TS introduction - PES(1)*See ISO 13818-1 Table 2-17TS introduction - PES(2)TS introduction - PES(3)*See ISO 13818-1 Table 2-18PS introduction - some features A single stream, combining one or more streams of PES packets with a common time base Designed for use in relatively error-free envir

10、onments which may involve software processing of system information such as interactive multimedia application PS packets may be variable and relatively great length PS may be either fixed or variable rate, PS rate is defined by the values and locations of SCR and program_mux_ratePS introduction - PS pack*See ISO 13818-1 Table 2-3