Atsc working Draft Template
Table 6.32 Bit Stream Syntax for the Component Name Descriptor Syntax
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Table 6.32 Bit Stream Syntax for the Component Name Descriptor
Syntax No. of Bits Format component_name_descriptor() { descriptor_tag 8 0xA3 descriptor_length 8 uimsbf component_name_string() var } descriptor_tag – This 8-bit unsigned integer shall have the value 0xA3, identifying this descriptor as component_name_descriptor . descriptor_length – This 8-bit unsigned integer specifies the number of bytes of the descriptor that immediately follow the descriptor_length field. component_name_string() – The name string in the format of a multiple string structure (see Section 6.10). 6.9.8 Stuffing Descriptor For certain applications it is necessary to define a block of N bytes as a placeholder. The N bytes themselves are not to be processed or interpreted. The stuffing_descriptor() is specified for this purpose. The stuffing_descriptor() is simply a descriptor type for which the contents, as indicated by the descriptor_length field, are to be disregarded. The tag type for the stuffing descriptor is 0x80. The stuffing_descriptor() may appear where descriptors are allowed in any table defined in the PSIP. 6.9.9 Descriptors for Inactive Channels The service_location_descriptor() shall not be present for inactive channels. Any other descriptors, if present, shall provide valid information about the inactive channel. The extended_channel_name_descriptor(), for example, can be used to provide the long-form channel name of the inactive channel. 6.9.10 DCC Departing Request Descriptor This descriptor provides instructions for the actions to be performed by a DCCRR upon detection of a manual channel change requested by the viewer using the channel change controls on the DCCRR or a DCCRR remote control device, or any DCC term set that evaluates to cause a channel change, just prior to executing the channel change itself. This function shall be defeatable by the viewer within setup menu selections and shall default to “not enabled” if the viewer does not explicitly enable it. This descriptor may appear within the dcc_additional_descriptor loop if it is desired to associate a departing request with a manual channel change, and within the dcc_test_descriptor loop if it is desired to associate a departing request with a particular virtual channel's DCC event. The bit stream syntax for the dcc_departing_request_descriptor() shall be as shown in Table 6.33. 75 ATSC A/65:2013 Program and System Information Protocol 7 August 2013 Download 4.82 Kb. Do'stlaringiz bilan baham: |
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