Atsc working Draft Template
Table 6.30 Selected Stream Type Assignments (Informative) stream_type Description
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Table 6.30 Selected Stream Type Assignments (Informative)
stream_type Description 0x02 ITU-T Rec. H.262 | ISO/IEC 13818-2 Video [14] or ISO/IEC 11172-2 [25] constrained parameter video stream 0x06 PES packets containing A/90 streaming, synchronized data 0x0B DSM-CC sections containing A/90 asynchronous data 0x0D DSM-CC addressable sections per A/90 0x14 DSM-CC sections containing non-streaming, synchronized data per A/90 0x81 Audio per ATSC A/53 Part 5 [18] 0x95 Sections conveying A/90 [20] Data Service Table, Network Resources Table 0xC2 PES packets containing A/90 [20] streaming, synchronous data elementary_PID – PID for the elementary stream. The value for elementary_PID , stream_type , and the associated ISO 639 [10] language code shall be the same as those delivered in an ES_info loop of the TS_program_map_section() currently being transmitted. ISO_639_language_code – This 3-byte (24 bits) field, in conformance with ISO 639.2/B [10], specifies the language used for the elementary stream. In case of no language specified for this elementary stream; e.g. video, each byte shall have the value 0x00. The value of the ISO_639_language_code field in the service_location_descriptor() shall be the same as the value in the corresponding ES_info loop of the TS_program_map_section() currently being transmitted. If neither an ISO_639_language_descriptor() nor an AC-3_audio_stream_descriptor() containing a 3-byte language field is present in the ES_info loop for this Elementary Stream in the currently transmitted TS_program_map_section() , each byte of the ISO_639_language_code field shall be zero. 6.9.6 Time-Shifted Service Descriptor This descriptor links one virtual channel with one or more virtual channels that carry the same programming on a time-shifted basis. The typical application is for Near Video On Demand (NVOD) services. The time_shifted_service_descriptor() shall be used only in the case that the time shift is constant across the time period covered by all EITs. The base channel of a set of NVOD channels is the sole channel in that set that carries a time_shifted_service_descriptor() within its VCT entry. An NVOD base channel’s EIT subtables shall be the same as that of a normal channel, except that EIT-0, in addition to its normal entries, shall list all events that have expired in the base channel’s schedule until they have expired in all its child channels. NVOD child services derive their EIT information from that of the base channel by applying the time_shift specified in the base channels’ time_shifted_service_descriptor() . ETMs for events expired in the base channel shall be carried on the PID listed for ETT-0 until they are no longer referenced by EIT-0. Two example scenarios can be found in informative Annex D. The bit stream syntax for the time_shifted_service_descriptor() shall be as shown in Table 6.31. 73 ATSC A/65:2013 Program and System Information Protocol 7 August 2013 Download 4.82 Kb. Do'stlaringiz bilan baham: |
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