ATSC标准

Doc.A/9026July00ATSCDATABROADCASTSTANDARDADVANCEDTELEVISIONSYSTEMSCOMMITTEEBlankPageATSCATSCDataBroadcastStandard(A/90)26July00—i—ATSCDATABROADCASTSTANDARDATSCSTANDARDTableofContents1.SCOPE.......................................................................................................................................................11.1Purpose11.2Organization11.3Constraints12.REFERENCES...........................................................................................................................................22.1NormativeReferences22.2InformativeReferences32.3ReferenceAcquisition33.DEFINITIONSANDSTRUCTURES...........................................................................................................53.1ComplianceNotation53.2AcronymsandAbbreviations53.3GlobalTerms73.4SectionandDataStructureSyntaxNotation113.5SpecialFieldMeanings113.6CodePoints113.6.1TableIDValues113.6.2StreamTypeValues123.6.3DescriptorTagValues123.6.4TableTypes124.SYSTEMASSUMPTIONS........................................................................................................................134.1”Distribution,Local”DiagramAssumptions134.2ReceiverDiagramAssumptions135.OVERVIEWOFTHEDATABROADCASTINGMECHANISMS..............................................................145.1DataDownloadProtocol145.2DSM-CCAddressableSections145.3AsynchronousData145.4SynchronousandSynchronizedStreamingData145.5DataPiping155.6DataServices156.DSM-CCCOMPATIBILITYDESCRIPTOR..............................................................................................166.1CompatibilityDescriptorSyntax166.2IEEEOUISpecifier18ATSCATSCDataBroadcastStandard(A/90)26July00—ii—7.DATADOWNLOADPROTOCOL............................................................................................................197.1Introduction197.1.1TransmissionofStreamingandNon-streamingAsynchronousData197.1.2TransmissionofNon-streaming,SynchronizedData197.1.3StructureoftheNon-flowControlledandCarouselScenarios207.2DataDownloadProtocolSpecification237.2.1DSM-CCSectionSyntaxforUser-to-NetworkDownloadProtocol237.2.2DSM-CCAdaptationHeaderSyntax257.2.3DownloadControlMessages267.2.3.1DSM-CCMessageHeaderSyntax267.2.3.2DownloadServerInitiateMessageSyntax277.2.3.3DownloadInfoIndicationMessageSyntax287.2.3.4ModuleDescriptionSyntax307.2.3.5DownloadCancelMessageSyntax307.2.3.6DescriptorsfortheDownloadControlMessages317.2.3.6.1ModuleLinkDescriptor317.2.3.6.2CRC32Descriptor327.2.3.6.3GroupLinkDescriptor337.2.4DownloadDataBlockMessageSyntax337.2.4.1DownloadDataHeaderSyntax337.2.4.2DownloadDataBlockMessageSyntax348.DSM-CCADDRESSABLESECTION......................................................................................................368.1EncapsulationRulesinDSM-CCAddressableSections389.SYNCHRONOUSANDSYNCHRONIZEDSTREAMINGDATA..............................................................399.1SynchronousDataBitstreamSyntax399.1.1SynchronousDataHeader409.1.2SynchronousDataSequenceStructure419.2SynchronizedDataBitstreamSyntax419.2.1SynchronizedDataPacketStructure419.3IPEncapsulation4310.DATAPIPING.................................................................................................................................4411.DATASERVICEANNOUNCEMENTREQUIREMENTS................................................................4511.1Introduction4511.2VirtualChannels4511.3DataEventTable4511.4ExtendedTextTable5011.5DataServiceDescriptor5011.6PIDCountDescriptor5311.7AnnouncementofFutureDataServices5312.SERVICEDESCRIPTIONFRAMEWORK......................................................................................5712.1AssociationTagDescriptor5712.2DataServiceTable5812.2.1DataServiceTableBytes5912.2.2TapStructure63ATSCATSCDataBroadcastStandard(A/90)26July00—iii—12.2.2.1DefinitionoftheSelectorStructure6412.2.3DownloadDescriptor6712.2.4MultiprotocolEncapsulationDescriptor6812.3NetworkResourcesTable6912.3.1NetworkResourcesTableBytesStructure7112.3.2DSM-CCResourceDescriptor7112.3.2.1AnnouncementofDataStreamsinOtherMPEG-2ProgramsandTransportStreams7312.3.2.2InternetProtocolVersion4ResourceDescriptor7412.3.2.3InternetProtocolVersion6ResourceDescriptor7512.3.2.4URLResourceDescriptor7613.SYSTEMTARGETDECODERMODEL.........................................................................................7713.1SmoothingBufferDescriptor7713.1.1DataServiceBelongingtoaVirtualChannelof“service_typeof0x04”7813.1.2DataServiceBelongingtoaVirtualChannelof“service_typeof0x02or0x03”7813.1.3DescriptorsintheESInformationDescriptorLoop7913.1.4DescriptorsintheExtendedProgramInformationDescriptorLoop7913.1.5Buffering7913.2BufferModelforSynchronizedDataServices8013.2.1GeneralConstraints8013.2.2DataElementaryStreamBufferforSynchronizedServices8113.2.3MinimumElementaryStreamBufferSize8113.2.4BufferSizesandDataServiceLevels8113.2.5BufferArrangement82ANNEXA–DEPARTURESFROMTHEDSM-CCSTANDARD..................................................................83ATSCATSCDataBroadcastStandard(A/90)26July00—1—1.SCOPE1.1