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Descriptors [ATSC Semantics]

Descriptors are (generally) optional elements within MPEG-2 private tables that convey specific bits of information.

the list below is a comprehensive list of all ATSC-designated descriptors. Many descriptors used in digital broadcasting are defined in the MPEG-1 or MPEG-2 specifications. SCTE-complaint transport streams have their own subset of descriptors, and there are descriptors specific to DVB and ARIB transmissions as well. .

ATSC descriptors
tag D/HexNamelocationsmax per loopreference
129 / 0x81AC-3 DescriptorPMT, EIT A/52
20 / 0x14association_tag descriptor  A/52
173 / 0xADATSC Private Information descriptorPMT, EIT1 or moreA/52
134 / 0x86Caption Service DescriptorPMT, EIT A/65
163 / 0xA3Component name descriptorPMT A/65
135 / 0x87Content Advisory DescriptorPMT, EIT A/65
198 / 0xB6Content Identifier descriptorPMT, EIT A/57
164 / 0xA4Data Service descriptorPMT, EIT A/65
166 / 0xA6Download descriptorPMT, EIT A/90
169 / 0x89DCC Arriving request descriptorDCCT A/65
168 / 0xA8DCC Departing request descriptorDCCT A/65
178 / 0xB2Enhanced Signaling descriptorPMT A/53
160 / 0xA0Extended Channel name descriptorVCT A/65
167 / 0xA7Multiprotocol Encapsulation descriptor  A/90
165 / 0xA5pid_count descriptorVCT A/65
171 / 0xABGenre descriptorVCT A/65
170 / 0xAARedistribution Control descriptorEIT, PMT A/65
161 / 0xA1Service location descriptorVCT A/65
128 / 0x80Stuffing Descriptorany A/65
162 / 0x82Time-shifted service descriptorVCT A/65

Descriptors are specified in several locations. The PSIP specficiation, A/65 describes descriptors in section 6.9.

Descriptors defined by ATSC are generally coordinated with SCTE, are compatible with ARIB descriptors, and may or may not have numeric conflicts with DVB-defined descriptors.

See Also: Descriptors, Generally

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