dcc_additional_descriptor() – A data structure in standard descriptor format (tag, length, data) that
provides additional information about the DCC requests described in this
directed_channel_change_table_section()
.
CRC_32 – This is a 32-bit field that contains the CRC value that ensures a zero output from the
registers in the decoder defined in Annex A of ISO/IEC 13818-1 [13] after processing the
entire Directed Channel Change Table section.
6.8
DCC Selection Code Table (DCCSCT)
The optional Directed Channel Change Selection Code Table (DCCSCT) carries genre code values
and genre criteria name values and/or state/county location codes for use in extending the original
data sets of those codes defined in Table 6.20 and Annex H.
The DCC Selection Code Table is carried in private sections with
table_id
0xD4, and obeys the
syntax and semantics given in Section 4.
The following constraints apply to the Transport Stream packets carrying DCCSCT sections.
•
PID
shall have the value 0x1FFB (
base_PID
)
•
transport_scrambling_control
bits shall have the value ‘00’
•
adaptation_field_control
bits shall have the value ‘01’
The bit stream syntax for the Directed Channel Change Selection Code Table shall be as shown
in Table 6.23.
63
ATSC A/65:2013
Program and System Information Protocol
7 August 2013
Table 6.23 Bit Stream Syntax for the DCC Selection Code Table
Syntax No. of Bits Format dcc_selection_code_table_section() {
table_id 8
0xD4
section_syntax_indicator 1
‘1’
private_indicator 1
‘1’