ETSI EN 300468: Digital Video Broadcasting SI Specification (2004)

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本资源是关于欧洲数字视频广播（Digital Video Broadcasting, DVB）的官方标准文档，即ETSI EN 300 468 V1.6.1，发布日期为2004年6月，由欧洲广播联盟（European Broadcasting Union, EBU）和欧洲电信标准化协会（European Telecommunications Standards Institute, ETSI）联合制定。该标准主要关注的是DVB系统中的服务信息（Service Information, SI）规格，这是数字电视广播中的关键组成部分，用于传输电视节目指南、广告和其他与电视服务相关的数据。标题“dvb-si en300468”明确指出了这份文档的焦点在于DVB-SI规范，它在MPEG（Moving Picture Experts Group）编码框架下运作，MPEG是多媒体技术的行业标准，特别适用于视频压缩和传输。DVB-SI确保了服务质量信息在广播系统中的有效传递，对于电视服务提供商和接收设备制造商来说，理解并遵循这一标准至关重要。文档参考了REN/JTC-DVB-158项目，表明它是DVB技术系列的一部分，关注点在于提高广播服务的效率和一致性。关键词包括“广播”、“数字”、“DVB”、“MPEG”、“服务”和“电视”，这些词汇突出了标准的主要应用场景和涉及的技术领域。 ETSI（European Telecommunications Standards Institute）是一个国际性的标准化组织，其地址位于法国索菲亚-安提布尔，用户可以通过其官方网站下载个人副本。值得注意的是，所有版本的文档中， Portable Document Format (PDF) 版本被认为是官方参考版本，任何电子版本的差异应以PDF打印版为准，存放在ETSI秘书处特定网络驱动器上。 ETSI EN 300 468 V1.6.1涵盖了诸如编码格式、传输协议、服务质量指示、加密机制等技术细节，以及如何在数字电视系统中实现用户引导、广告插入、紧急信息播送等功能。对于电视台、卫星广播运营商、机顶盒制造商和内容提供商来说，理解和实施这个标准有助于确保他们的产品和服务能无缝集成到全球DVB网络中，同时提升用户体验和整体行业标准水平。

ETSI

inal draft ETSI EN 300 468 V1.6.1 (2004

Value Description

0x7E discontinuity_information_section

0x7F selection_information_section

0x80 to 0xFE user defined

0xFF reserved

5.1.4 Repetition rates and random access

In systems where random access is a consideration, it is recommended to re-transmit SI sections specified within the

present document several times, even when changes do not occur in the configuration.

For SI specified within the present document the minimum time interval between the arrival of the last byte of a section

to the first byte of the next transmitted section with the same PID, table_id and table_id_extension and with the same or

different section_number shall be 25 ms. This limit applies for TSs with a total data rate of up to 100 Mbit/s.

5.1.5 Scrambling

With the exception of the EIT carrying schedule information, all tables specified in the present document shall not be

scrambled. One method for scrambling the EIT schedule table is given in annex D, Bibliography. If a scrambling

method operating over TS packets is used, it may be necessary to use a stuffing mechanism to fill from the end of a

section to the end of a packet so that any transitions between scrambled and unscrambled data occur at packet

boundaries.

In order to identify the CA streams which control the descrambling of the EIT data, a scrambled EIT schedule table

shall be identified in the PSI. Service_id value 0xFFFF is allocated to identifying a scrambled EIT, and the program

map section for this service shall describe the EIT as a private stream and shall include one or more CA_descriptors

(defined in ISO/IEC 13818-1 [1]) which give the PID values and optionally, other private data to identify the associated

CA streams. Service_id value 0xFFFF shall not be used for any other service.

5.2 Table definitions

The following clauses describe the syntax and semantics of the different types of table.

NOTE: The symbols and abbreviations, and the method of describing syntax used in the present document are the

same as those defined in clauses 2.2 and 2.3 of ISO/IEC 13818-1 [1].

5.2.1 Network Information Table (NIT)

The NIT (see table 3) conveys information relating to the physical organization of the multiplexes/TSs carried via a

given network, and the characteristics of the network itself. The combination of original_network_id and

transport_stream_id allow each TS to be uniquely identified throughout the ETS application area. Networks are

assigned individual network_id values, which serve as unique identification codes for networks. The allocation of these

codes may be found in ETR 162 [6]. In the case that the NIT is transmitted on the network on which the TS was

originated, the network_id and the original_network_id shall take the same value.

Guidelines for the processing of SI at transitions between delivery media boundaries, e.g. from satellite to cable or

SMATV systems, can be found in TR 101 211 [7].

IRDs may be able to store the NIT information in non-volatile memory in order to minimize the access time when

switching between channels ("channel hopping"). It is also possible to transmit a NIT for other networks in addition to

the actual network. Differentiation between the NIT for the actual network and the NIT for other networks is achieved

using different table_id values (see table 2).

The NIT shall be segmented into network_information_sections using the syntax of table 3. Any sections forming part

of an NIT shall be transmitted in TS packets with a PID value of 0x0010. Any sections of the NIT which describe the

actual network (that is, the network of which the TS containing the NIT is a part) shall have the table_id 0x40 with the

same table_id_extension (network_id). The network_id field takes the value assigned to the actual network in

ETR 162 [6]. Any sections of an NIT which refer to a network other than the actual network shall take a table_id value

of 0x41 and the network_id shall take the value allocated to the other network in ETR 162 [6].

ETSI

inal draft ETSI EN 300 468 V1.6.1 (2004

Table 3: Network information section

Syntax Number of bits

Identifier

network_information_section(){

table_id

8 uimsbf

section_syntax_indicator

1 bslbf

reserved_future_use

1 bslbf

reserved

2 bslbf

section_length

12 uimsbf

network_id

16 uimsbf

reserved

2 bslbf

version_number

5 uimsbf

current_next_indicator

1 bslbf

section_number

8 uimsbf

last_section_number

8 uimsbf

reserved_future_use

4 bslbf

network_descriptors_length

12 uimsbf

for(i=0;i<N;i++){

descriptor()

}

reserved_future_use

4 bslbf

transport_stream_loop_length

12 uimsbf

for(i=0;i<N;i++){

transport_stream_id

16 uimsbf

original_network_id

16 uimsbf

reserved_future_use

4 bslbf

transport_descriptors_length

12 uimsbf

for(j=0;j<N;j++){

descriptor()

}

CRC_32

32 rpchof

}

Semantics for the network information section:

table_id: See table 2.

section_syntax_indicator: The section_syntax_indicator is a 1-bit field which shall be set to "1".

section_length: This is a 12-bit field, the first two bits of which shall be "00". It specifies the number of bytes of the

section, starting immediately following the section_length field and including the CRC. The section_length shall not

exceed 1 021 so that the entire section has a maximum length of 1 024 bytes.

network_id: This is a 16-bit field which serves as a label to identify the delivery system, about which the NIT informs,

from any other delivery system. Allocations of the value of this field are found in ETR 162 [6].

version_number: This 5-bit field is the version number of the sub_table. The version_number shall be incremented by

1 when a change in the information carried within the sub_table occurs. When it reaches value 31, it wraps around to 0.

When the current_next_indicator is set to "1", then the version_number shall be that of the currently applicable

sub_table defined by the table_id and network_id. When the current_next_indicator is set to "0", then the

version_number shall be that of the next applicable sub_table defined by the table_id and network_id.

current_next_indicator: This 1-bit indicator, when set to "1" indicates that the sub_table is the currently applicable

sub_table. When the bit is set to "0", it indicates that the sub_table sent is not yet applicable and shall be the next

sub_table to be valid.

section_number: This 8-bit field gives the number of the section. The section_number of the first section in the

sub_table shall be "0x00". The section_number shall be incremented by 1 with each additional section with the same

table_id and network_id.

last_section_number: This 8-bit field specifies the number of the last section (that is, the section with the highest

section_number) of the sub_table of which this section is part.

network_descriptors_length: This 12-bit field gives the total length in bytes of the following network descriptors.

ETSI

inal draft ETSI EN 300 468 V1.6.1 (2004

transport_stream_loop_length: This is a 12-bit field specifying the total length in bytes of the TS loops that follow,

ending immediately before the first CRC-32 byte.

transport_stream_id: This is a 16-bit field which serves as a label for identification of this TS from any other

multiplex within the delivery system.

original_network_id: This 16-bit field gives the label identifying the network_id of the originating delivery system.

transport_descriptors_length: This is a 12-bit field specifying the total length in bytes of TS descriptors that follow.

CRC_32: This is a 32-bit field that contains the CRC value that gives a zero output of the registers in the decoder

defined in annex B after processing the entire section.

5.2.2 Bouquet Association Table (BAT)

The BAT (see table 4) provides information regarding bouquets. A bouquet is a collection of services, which may

traverse the boundary of a network.

The BAT shall be segmented into bouquet_association_sections using the syntax of table 4. Any sections forming part

of a BAT shall be transmitted in TS packets with a PID value of 0x0011. The sections of a BAT sub_table describing a

particular bouquet shall have the bouquet_id field taking the value assigned to the bouquet described in ETR 162 [6].

All BAT sections shall take a table_id value of 0x4A.

Table 4: Bouquet association section

Syntax Number of bits

Identifier

bouquet_association_section(){

table_id

8 uimsbf

section_syntax_indicator

1 bslbf

reserved_future_use

1 bslbf

reserved

2 bslbf

section_length

12 uimsbf

bouquet_id

16 uimsbf

reserved

2 bslbf

version_number

5 uimsbf

current_next_indicator

1 bslbf

section_number

8 uimsbf

last_section_number

8 uimsbf

reserved_future_use

4 bslbf

bouquet_descriptors_length

12 uimsbf

for(i=0;i<N;i++){

descriptor()

}

reserved_future_use

4 bslbf

transport_stream_loop_length

12 uimsbf

for(i=0;i<N;i++){

transport_stream_id

16 uimsbf

original_network_id

16 uimsbf

reserved_future_use

4 bslbf

transport_descriptors_length

12 uimsbf

for(j=0;j<N;j++){

descriptor()

}

CRC_32

32 rpchof

}

Semantics for the bouquet association section:

table_id: See table 2.

section_syntax_indicator: The section_syntax_indicator is a 1-bit field which shall be set to "1".

ETSI

inal draft ETSI EN 300 468 V1.6.1 (2004

section_length: This is a 12-bit field, the first two bits of which shall be "00". It specifies the number of bytes of the

section, starting immediately following the section_length field and including the CRC. The section_length shall not

exceed 1 021 so that the entire section has a maximum length of 1 024 bytes.

bouquet_id: This is a 16-bit field which serves as a label to identify the bouquet. Allocations of the value of this field

are found in ETR 162 [6].

version_number: This 5-bit field is the version number of the sub_table. The version_number shall be incremented by

1 when a change in the information carried within the sub_table occurs. When it reaches value 31, it wraps around to 0.

When the current_next_indicator is set to "1", then the version_number shall be that of the currently applicable

sub_table defined by the table_id and bouquet_id. When the current_next_indicator is set to "0", then the

version_number shall be that of the next applicable sub_table defined by the table_id and bouquet_id.

current_next_indicator: This 1-bit indicator, when set to "1" indicates that the sub_table is the currently applicable

sub_table. When the bit is set to "0", it indicates that the sub_table sent is not yet applicable and shall be the next

sub_table to be valid.

section_number: This 8-bit field gives the number of the section. The section_number of the first section in the

sub_table shall be "0x00". The section_number shall be incremented by 1 with each additional section with the same

table_id and bouquet_id.

last_section_number: This 8-bit field specifies the number of the last section (that is, the section with the highest

section_number) of the sub_table of which this section is part.

bouquet_descriptors_length: This 12-bit field gives the total length in bytes of the following descriptors.

transport_stream_loop_length: This is a 12-bit field specifying the total length in bytes of the TS loop that follows.

transport_stream_id: This is a 16-bit field which serves as a label for identification of this TS from any other

multiplex within the delivery system.

original_network_id: This 16-bit field gives the label identifying the network_id of the originating delivery system.

transport_descriptors_length: This is a 12-bit field specifying the total length in bytes of TS descriptors that follow.

CRC_32: This is a 32-bit field that contains the CRC value that gives a zero output of the registers in the decoder

defined in annex B after processing the entire private section.

5.2.3 Service Description Table (SDT)

Each sub_table of the SDT (see table 5) shall describe services that are contained within a particular TS. The services

may be part of the actual TS or part of other TSs, these being identified by means of the table_id (see table 2).

The SDT shall be segmented into service_description_sections using the syntax of table 5. Any sections forming part of

an SDT shall be transmitted in TS packets with a PID value of 0x0011. Any sections of the SDT which describe the

actual TS (that is, the TS containing the SDT) shall have the table_id value 0x42 with the same table_id_extension

(transport_stream_id) and with the same original_network_id. Any sections of an SDT which refer to a TS other than

the actual TS shall take a table_id value of 0x46.

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