ts流分析报告(实用标准2.4翻译版)

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1、2.4TransportStreambitstreamrequirements2.4.1TransportStreamcodingstructureandparametersTheITU-TRec.H.222.0

2、ISO/IEC13818-1TransportStreamcodinglayerallowsoneormoreprogramstobecombinedintoasinglestream.Datafromeachelementarystreamaremultiplexedtogetherwithinformationthatallowssynch

3、ronizedpresentationoftheelementarystreamswithinaprogram.TS编码层允许将一个或多个节目组合成一个流。每个ES的数据由同一个节目中ES的同步表示的信息来复合。ATransportStreamconsistsofoneormoreprograms.Audioandvideoelementarystreamsconsistofaccessunits.一个TS是由一个或多个节目组成。音频和视频的ES是由访问单元(AU)组成。ElementaryStreamdataiscarriedinPESpackets.

4、APESpacketconsistsofaPESpacketheaderfollowedbypacketdata.PESpacketsareinsertedintoTransportStreampackets.ThefirstbyteofeachPESpacketheaderislocatedatthefirstavailablepayloadlocationofaTransportStreampacket.PES包装载有ES数据。PES包是由包头和包数据组成。PES包又插入到TS包中。每个PES包头的第一个字节装载于TS包的第一个有效负载位置。TheP

5、ESpacketheaderbeginswitha32-bitstart-codethatalsoidentifiesthestreamorstreamtypetowhichthepacketdatabelongs.ThePESpacketheadermaycontaindecodingandpresentationtimestamps(DTSandPTS).ThePESpacketheaderalsocontainsotheroptionalfields.ThePESpacketdatafieldcontainsavariablenumberofcon

6、tiguousbytesfromoneelementarystream.PES包头由一个32位长的起始码开始，它定义了包数据所属的流或流类型。PES包头还包含有解码和表示时间戳(DTSandPTS)。PES包头还有其它的可选域。PES包数据域包含有变长且连续的ES数据字节。TransportStreampacketsbeginwitha4-byteprefix,whichcontainsa13-bitPacketID(PID),definedinTable2-2.ThePIDidentifies,viatheProgramSpecificInformat

7、ion(PSI)tables,thecontentsofthedatacontainedintheTransportStreampacket.TransportStreampacketsofonePIDvaluecarrydataofoneandonlyoneelementarystream.TS包由4字节的前缀开始，它包含一个13比特长的包ID(PID),定义见于Table2-2。PID的识别要通过PSI表(它被包含在TS包中)。一个PID的TS包有且只能有一个ES。ThePSItablesarecarriedintheTransportStream.

8、TherearefourPSItables:•ProgramAssociationTable;节目相关表•ProgramMapTable;节目映射表•ConditionalAccessTable;条件访问表•NetworkInformationTable.网络信息表Thesetablescontainthenecessaryandsufficientinformationtodemultiplexandpresentprograms.TheProgramMapTable,inTable2-28,specifies,amongotherinformatio

9、n,whichPIDs,andthereforewhichelementarys