Atsc working Draft Template
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descriptor_length
– This 8-bit unsigned integer specifies the number of bytes of the descriptor that immediately follow the descriptor_length field. dcc_arriving_request_type – This 8-bit unsigned integer specifies the type of the DCC arriving request and shall have the values listed in Table 6.36. Table 6.36 DCC Arriving Request Type Assignments dcc_arriving_request_type Meaning 0x00 Reserved 0x01* Display arriving request text in a centered window for a minimum of 10 seconds after performing the channel change requested by the viewer, or for a less amount of time if the viewer issues a "continue", "OK", "proceed", or equivalent command. 0x02* Display arriving request text in a centered window indefinitely after performing a channel change request requested by the viewer until viewer issues a "continue", "OK", "proceed", or equivalent command. 0x03-0xFF Reserved * Note: The above suggested behavior of the DCCRR’s implementation of Arriving Request types 0x01 and 0x02 are within the discretion of DCCRR manufacturers. The DCCRR’s reaction to these commands may also be disabled by viewers through an interactive setup session. dcc_arriving_request_text_length – An 8-bit unsigned integer number that specifies the total length in bytes of the dcc_arriving_request_text() field to follow. dcc_arriving_request_text() – The arriving request window text in the format of a multiple string structure (see Section 6.10). 6.9.12 Redistribution Control (RC) Descriptor The purpose of the Redistribution Control descriptor is to convey a certain type of redistribution information held by the program rightsholder for audio, video, or data events. The descriptor’s existence within the ATSC stream shall mean: “technological control of consumer redistribution is signaled.” The redistribution control information conveyed by the rc_descriptor() defined in Table 6.37 concerns the video/audio/data programming identified either by the event_id within the EIT or the program_number within the TS_program_map_section() . For terrestrial broadcast transport, the rc_descriptor() , when transmitted, shall be present in both the EIT and TS_program_map_section() . For cable transport, the rc_descriptor() , when transmitted, shall be present in the TS_program_map_section() , and, when the EIT is carried, in the EIT. 77 ATSC A/65:2013 Program and System Information Protocol 7 August 2013 The rc_descriptor(), when in the EIT, shall apply to a specific event associated with the Virtual Channel and the related MPEG-2 Program. It shall be placed within the descriptor loop after descriptors_length for the event_id for which this information is being signaled. The rc_descriptor(), shall be placed within the descriptor loop after program_info_length in the TS_program_map_section() for the program_number for which this information is being signaled. When the descriptor is placed in the TS_program_map_section() , it shall also be placed in the current event of EIT-0 for the Virtual Channel associated with the MPEG-2 Program; and it should be placed in the EIT for this event as far in advance as possible (i.e., minimally EIT-1, EIT-2, and EIT-3). For data-only services 17 , the rc_descriptor() shall be placed in the DET (whose syntax and semantics are defined in ATSC A/90 Data Broadcasting Standard [20]) under the same provisions described for the EIT. It is out of the scope of this standard to assert how any receiving device reacts when the rc_descriptor is present. The bit stream syntax for the redistribution control descriptor shall be as shown in Table 6.37. Download 4.82 Kb. Do'stlaringiz bilan baham: |
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