TS 102 323 - V1.4.1 - Digital Video Broadcasting (DVB ... - ETSI

7.3.1.4 Container section
36
ETSI
ETSI TS 102 323 V1.4.1 (2010-01)
For delivery, a container is carried in a container_sub_table split into a sequence of one or more blocks of container
data. Each block is carried as a section, the numbering of each section corresponding to the position of the container
data block in the sequence. The sections for a container form a single container_sub_table, distinguished by
container_id. Before a container can be parsed, all sections forming a single container_sub_table must be acquired. The
container is reconstructed by appending container data blocks together in the order defined by the section number and
reversing compression if this has been applied.
The container section is derived from the standard private_section syntax as defined in ISO/IEC 13818-1 [9]. A
container is carried by one or more container sections. Every container section shall carry 4 084 bytes of container data,
except the container_section with section_number equal to last_section_number, which shall carry however many bytes
remain of the container sub_table. The syntax of the container section is defined by table 20.
Table 20: Container section
Syntax No. of bits Identifier
container section() {
table id 8 uimsbf
section syntax indicator 1 bslbf
private indicator 1 bslbf
reserved 2 bslbf
private section length 12 uimsbf
container id 16 uimsbf
reserved 2 bslbf
version number 5 uimsbf
current next indicator 1 bslbf
section number 8 uimsbf
last section number 8 uimsbf
container data()
CRC32 32 uimsbf
}
table_id: This field shall be set to 0x75 (see EN 300 468 [1]).
section_syntax_indicator: This shall be set to '1' to indicate that the private section follows the generic section syntax.
private_indicator: This flag shall be set to '1'.
private_section_length: The number of remaining bytes in the private section immediately following the
private_section_length field up to the end of the private_section.
container_id: This shall contain the container_id of the container carried by the table this section is part of.
version_number: The version of the table. The version shall be incremented by 1 modulo 32 when there is a change in
the information.
current_next_indicator: This field shall be set to '1' to indicate that the section is currently valid.
section_number: This 8-bit field specifies the number of the private section. This section_number will be incremented
by 1 with each additional section in the table.
last_section_number: This specifies the number of the last section making up this table.
container_data(): A sequence of bytes making up a portion of a compression_wrapper.
CRC32: This field contains the CRC value that gives a zero output of the registers in the decoder defined in
EN 300 468 [1] after processing the entire private section.