DVB SI标准：EN300468 V1.13.1 (2012-08)

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"DVB SI标准文档，EN 300468 V1.13.1 (2012-08)，详细规定了在DVB系统中服务信息（SI）的规范，由欧洲电信标准协会（ETSI）发布。" 本文档EN 300468 V1.13.1是关于数字视频广播（DVB）系统中服务信息（SI）的一个关键标准，它定义了如何在DVB系统中组织和传递关于电视服务、频道和其他相关信息的元数据。这个版本发布于2012年8月，是DVB SI规范的第13次修订版。 DVB SI的主要目标是确保接收端（如电视机顶盒或智能电视）能够正确解析和显示广播服务的列表，包括电视频道、节目时间表、电子节目指南（EPG）以及附加服务信息。这些信息对于用户浏览和选择观看的电视内容至关重要。标准涵盖了以下几个核心知识点： 1. **服务信息结构**：定义了服务信息的层次结构和组成，包括节目链（ Programme Chain, PC）、节目（Programme, P）、服务（Service, S）等元素，以及它们之间的关系。 2. **MPEG-2传输流中的SI数据包**：描述了如何在MPEG-2传输流中插入和携带SI数据，这些数据通常包含在特定的TS包中，如PAT（节目关联表）、PMT（节目映射表）和NIT（网络信息表）等。 3. **EPG结构**：规定了电子节目指南的格式和内容，允许用户查看未来节目的时间表和详细信息。 4. **网络和传输层信息**：如NIT提供了网络配置和覆盖范围的信息，而SDT（服务描述表）则列出了可用的服务及其属性。 5. **适配和解码**：解释了接收设备如何解析这些信息，并将其转化为用户友好的形式，如频道列表和节目信息。 6. **兼容性和互操作性**：确保不同制造商的DVB设备能够理解和处理相同的SI数据，从而促进整个行业的统一和互操作性。 7. **更新和同步机制**：定义了如何及时更新SI数据，以反映服务变更或新服务的引入，同时保持系统稳定运行。此文档可能有多个电子版本和印刷版，但以PDF格式的ETSI官方打印版作为参考版本。如果出现版本差异，应以存储在特定网络驱动器上的PDF版本为准。此外，用户需要注意，该文档可能会进行修订或状态更改，因此需要定期检查ETSI网站获取最新信息。 EN 300468 V1.13.1是DVB系统中不可或缺的一部分，它确保了服务信息的标准化和高效传递，促进了全球数字电视服务的广泛采用和用户体验的提升。

ETSI

ETSI EN 300 468 V1.13.1 (2012

08)

PSTN Public Switched Telephone Network

QAM Quadrature Amplitude Modulation

QPSK Quaternary Phase Shift Keying

RAM Random Access Memory

RAR Resolution Authority Record

rpchof remainder polynomial coefficients, highest order first

RDS Radio Data System

RFC Request For Comments

RNT RAR Notification Table

RCS Return Channel Satellite

NOTE: See EN 301 790 [7].

RS Reed-Solomon

RST Running Status Table

ScF Scale Factor

SD Standard Definition (Video)

SDT Service Description Table

SFN Single Frequency Network

SI Service Information

SISO Single Input, Single Output

SIT Selection Information Table

SMATV Satellite Master Antenna Television

SMI Storage Media Interoperability

SRM System Renewability Message

SSU System Software Update

NOTE: See EN 301 192 [4].

ST Stuffing Table

tcimsbf Two's complement integer, msb (sign) bit first

TDM Time-Domain Multiplex

TDT Time and Date Table

TFS Time Frequency Slicing (DVB-T2)

TOT Time Offset Table

TPS Transmission Parameter Signalling

TS Transport Stream

TSDT Transport Stream Description Table

TVA TV-Anytime

NOTE: See http://www.tv-anytime.org.

UECP Universal Encoder Communication Protocol (RDS)

uimsbf unsigned integer most significant bit first

URL Uniform Resource Locator

USI Usage State Information

UTC Universal Time, Co-ordinated

UTF-8 UCS Transformation Format, 8-bit

NOTE: See ISO/IEC 10646 [16].

VBI Vertical Blanking Interval

VC-1 advanced Video Coding

NOTE: See TS 101 154 [9].

VPS Video Programme System

WSS Wide Screen Signalling

XAIT XML encoding for AIT

NOTE: See TS 102 727 [i.3].

ETSI

ETSI EN 300 468 V1.13.1 (2012

08)

4 Service Information (SI) description

ISO/IEC 13818-1 [18] specifies SI which is referred to as PSI. The PSI data provides information to enable automatic

configuration of the receiver to demultiplex and decode the various streams of programs within the multiplex.

The PSI data is structured as four types of table. The tables are transmitted in sections.

1) Program Association Table (PAT):

- for each service in the multiplex, the PAT indicates the location (the Packet Identifier (PID) values of the

Transport Stream (TS) packets) of the corresponding Program Map Table (PMT). It also gives the

location of the Network Information Table (NIT).

2) Conditional Access Table (CAT):

- the CAT provides information on the CA systems used in the multiplex; the information is private (not

defined within the present document) and dependent on the CA system, but includes the location of the

EMM stream, when applicable.

3) Program Map Table (PMT):

- the PMT identifies and indicates the locations of the streams that make up each service and the location

of the Program Clock Reference fields for a service.

4) Network Information Table (NIT):

- the location of the NIT is defined in the present document in compliance with ISO/IEC 13818-1 [18]

specification, but the data format is outside the scope of ISO/IEC 13818-1 [18]. It is intended to provide

information about the physical network. The syntax and semantics of the NIT are defined in the present

document.

In addition to the PSI, data is needed to provide identification of services and events for the user. The coding of this

data is defined in the present document. In contrast with the PAT, CAT, and PMT of the PSI, which give information

only for the multiplex in which they are contained (the actual multiplex), the additional information defined within the

present document can also provide information on services and events carried by different multiplexes, and even on

other networks. This data is structured as nine tables:

1) Bouquet Association Table (BAT):

- the BAT provides information regarding bouquets. As well as giving the name of the bouquet, it provides

a list of services for each bouquet.

2) Service Description Table (SDT):

- the SDT contains data describing the services in the system e.g. names of services, the service provider,

etc.

3) Event Information Table (EIT):

- the EIT contains data concerning events or programmes such as event name, start time, duration, etc.;

- the use of different descriptors allows the transmission of different kinds of event information e.g. for

different service types.

4) Running Status Table (RST):

- the RST gives the status of an event (running/not running). The RST updates this information and allows

timely automatic switching to events.

5) Time and Date Table (TDT):

- the TDT gives information relating to the present time and date. This information is given in a separate

table due to the frequent updating of this information.

ETSI

ETSI EN 300 46

8 V1.13.1 (2012

08)

5 Service Information (SI) tables

5.1 SI table mechanism

The SI specified in the present document and MPEG-2 PSI tables shall be segmented into one or more sections before

being inserted into TS packets.

The tables listed in clause 4 are conceptual in that they need never be regenerated in a specified form within an IRD.

The tables, when transmitted shall not be scrambled, with the exception of the EIT, which may be scrambled if required

(see clause 5.1.5).

A section is a syntactic structure that shall be used for mapping all MPEG-2 tables and SI tables specified in the present

document, into TS packets.

These SI syntactic structures conform to the private section syntax defined in ISO/IEC 13818-1 [18].

5.1.1 Explanation

Sections may be variable in length. The sections within each table are limited to 1 024 bytes in length, except for

sections within the EIT which are limited to 4 096 bytes. Each section is uniquely identified by the combination of the

following elements:

a) table_id:

- The table_id identifies to which table the section belongs.

- Some table_ids have been defined by ISO and others by ETSI. Other values of the table_id can be

allocated by the user for private purposes. The list of values of table_id is contained in table 2.

b) table_id_extension:

- The table_id_extension is used for identification of a sub_table.

- The interpretation of each sub_table is given in clause 5.2.

c) section_number:

- The section_number field allows the sections of a particular sub_table to be reassembled in their original

order by the decoder. It is recommended, that sections are transmitted in numerical order, unless it is

desired to transmit some sections of the sub_table more frequently than others, e.g. due to random access

considerations.

- For the SI tables as specified in the present document, section numbering applies to sub_tables.

d) version_number:

- When the characteristics of the TS described in the SI given in the present document change (e.g. new

events start, different composition of elementary streams for a given service), then new SI data shall be

sent containing the updated information. A new version of the SI data is signalled by sending a sub_table

with the same identifiers as the previous sub_table containing the relevant data, but with the next value

of version_number.

- For the SI tables specified in the present document, the version_number applies to all sections of a

sub_table.

e) Current_next_indicator:

- Each section shall be numbered as valid "now" (current), or as valid in the immediate future (next).

This allows the transmission of a future version of the SI in advance of the change, giving the decoder

the opportunity to prepare for the change. There is however, no requirement to transmit the next version

of a section in advance, but if it is transmitted, then it shall be the next correct version of that section.

ETSI

ETSI EN 300 468 V1.13.1 (2012

08)

5.1.2 Mapping of sections into Transport Stream (TS) packets

Sections shall be mapped directly into TS packets. Sections may start at the beginning of the payload of a TS packet,

but this is not a requirement, because the start of the first section in the payload of a TS packet is pointed to by the

pointer_field. There is never more than one pointer_field in a TS packet, as the start of any other section can be

identified by counting the length of the first and any subsequent sections, since no gaps between sections within a TS

packet are allowed by the syntax.

Within TS packets of any single PID value, one section is finished before the next one is allowed to be started, or else it

is not possible to identify to which section header the data belongs. If a section finishes before the end of a TS packet,

but it is not convenient to open another section, a stuffing mechanism may be used to fill up the space.

Stuffing may be performed by filling each remaining byte of the TS packet with the value "0xFF". Consequently the

value "0xFF" shall not be used for the table_id. If the byte immediately following the last byte of a section takes the

value of "0xFF", then the rest of the TS packet shall be stuffed with "0xFF" bytes. These bytes may be discarded by a

decoder. Stuffing may also be performed using the adaptation_field mechanism.

For a more detailed description of the mechanism and functionality, specifically refer to clause 2.4.4 and annex C of

ISO/IEC 13818-1 [18].

5.1.3 Coding of PID and table_id fields

Table 1 lists the PID values which shall be used for the TS packets which carry SI sections.

Table 1: PID allocation for SI

Table

PID value

PAT 0x0000

CAT 0x0001

TSDT 0x0002

reserved 0x0003 to 0x000F

NIT, ST 0x0010

SDT, BAT, ST 0x0011

EIT, ST, CIT (TS 102 323 [13]) 0x0012

RST, ST 0x0013

TDT, TOT, ST 0x0014

network synchronization 0x0015

RNT (TS 102 323 [13]) 0x0016

reserved for future use 0x0017 to 0x001B

inband signalling 0x001C

measurement 0x001D

DIT 0x001E

SIT 0x001F

Table 2 lists the values which shall be used for table_id for the service information, defined in the present document.

Table 2: Allocation of table_id values

Value

Description

0x00 program_association_section

0x01 conditional_access_section

0x02 program_map_section

0x03 transport_stream_description_section

0x04 to 0x3F reserved

0x40 network_information_section - actual_network

0x41 network_information_section - other_network

0x42 service_description_section - actual_transport_stream

0x43 to 0x45 reserved for future use

0x46 service_description_section - other_transport_stream

0x47 to 0x49 reserved for future use

0x4A bouquet_association_section

0x4B to 0x4D reserved for future use

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