1、 ETSI EN 300 472 V1.4.1 (2017-04) Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext in DVB bitstreams EUROPEAN STANDARD ETSI ETSI EN 300 472 V1.4.1 (2017-04) 2 Reference REN/JTC-DVB-365 Keywords broadcasting, digital, DVB, MPEG, teletext, TV, video ETSI 650 Route
2、des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.or
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6、 Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI
7、. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. European Broadcasting Union 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Membe
8、rs. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI EN 300 472 V1.4.1 (2017-04) 3 Contents Intellectual Property Rights 4g3Foreword .
9、4g3Modal verbs terminology 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Insertion of Teletext into MPEG-2 transport multiplex . 7g34.0 Packetization and signalling . 7g34.1 T
10、ransport Stream (TS) packet format . 8g34.2 PES packet format 8g34.3 Syntax for PES data field . 8g34.4 Semantics for PES data field 9g35 Teletext decoder model 10g3Annex A (informative): PTS transmission . 11g3Annex B (informative): Change history . 12g3History 13g3ETSI ETSI EN 300 472 V1.4.1 (2017
11、-04) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual P
12、roperty Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR
13、searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (EN) has been produced
14、 by Joint Technical Committee (JTC) Broadcast of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of st
15、andards in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association
16、of broadcasting organizations whose work includes the co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcas
17、ting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 The Digital Video Broadcasting Project (DVB) is an industry-led consortium of broadcasters, manufacturers, network operators, software developers, regulatory bodies, content owners and others committed
18、 to designing global standards for the delivery of digital television and data services. DVB fosters market driven solutions that meet the needs and economic circumstances of broadcast industry stakeholders and consumers. DVB standards cover all aspects of digital television from transmission throug
19、h interfacing, conditional access and interactivity for digital video, audio and data. The consortium came together in 1993 to provide global standardisation, interoperability and future proof specifications. National transposition dates Date of adoption of this EN: 5 April 2017 Date of latest annou
20、ncement of this EN (doa): 31 July 2017 Date of latest publication of new National Standard or endorsement of this EN (dop/e): 31 January 2018 Date of withdrawal of any conflicting National Standard (dow): 31 January 2018 ETSI ETSI EN 300 472 V1.4.1 (2017-04) 5 Modal verbs terminology In the present
21、document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables exc
22、ept when used in direct citation. ETSI ETSI EN 300 472 V1.4.1 (2017-04) 6 1 Scope The present document specifies the method by which ITU-R System B Teletext (Recommendation ITU-R BT.653 3), also known as EBU Teletext (see ETSI EN 300 706 4), may be carried in DVB bitstreams. This transport mechanism
23、 is intended to satisfy the following requirements: to support the transcoding of the Teletext data into the Vertical Blanking Interval (VBI) of analogue video. The transcoded signal should be compatible with existing TV receivers with Teletext decoders; the maximum data rate for each Teletext servi
24、ce is equivalent to 16 lines per field so that the service is always suitable for transcoding into the VBI; the transmission mechanism should be capable of transmitting subtitles with accurate timing with respect to the video (i.e. to within or near frame accuracy). A more general data transport mec
25、hanism for conveying new types of data services is outside the scope of the present document, but the transport syntax specified here can also be adapted for other data. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or v
26、ersion number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be
27、found at https:/docbox.etsi.org/Reference/. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. 1 ISO/IEC 13818-1: “Info
28、rmation technology - Generic coding of moving pictures and associated audio information - Part 1: Systems“. 2 ETSI EN 300 468: “Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems“. 3 Recommendation ITU-R BT.653: “Teletext systems“. 4 ETSI EN 300 706: “Enhance
29、d Teletext specification“. 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced
30、 document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the
31、 user with regard to a particular subject area. i.1 ISO/IEC 13818-2: “Information technology - Generic coding of moving pictures and associated audio information - Part 2: Video“. ETSI ETSI EN 300 472 V1.4.1 (2017-04) 7 i.2 ISO/IEC 13818-3: “Information technology - Generic coding of moving pictures
32、 and associated audio information - Part 3: Audio“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: MPEG 2: Refers to ISO/IEC 13818 set of standards. NOTE: Systems coding is defined in part 1 1, video coding is defi
33、ned in part 2 i.1, and audio coding is defined in part 3 i.2 of ISO/IEC 13818. section: syntactic structure used for mapping all service information defined in ETSI EN 300 468 2 into ISO/IEC 13818-1 1 Transport Stream (TS) packets service: sequence of programmes under the control of a broadcaster wh
34、ich can be broadcast as part of a schedule teletext descriptor: descriptor used in the Program Specific Information (PSI) Program Map Table (PMT) to identify streams which carry EBU teletext data NOTE: See ETSI EN 300 468 2. 3.2 Abbreviations For the purposes of the present document, the following a
35、bbreviations apply: DVB Digital Video Broadcasting MPEG Moving Pictures Expert Group PES Packetized Elementary Stream PID Packet IDentifier PMT Program Map Table PSI Program Specific Information PTS Presentation Time Stamp SI Service Information TS Transport StreamTV TeleVision VBI Vertical Blanking
36、 Interval 4 Insertion of Teletext into MPEG-2 transport multiplex 4.0 Packetization and signalling Teletext data shall be conveyed in Packetized Elementary Stream (PES) packets as defined in clause 4.2, carried by Transport Stream (TS) packets as defined in ISO/IEC 13818-1 1 and according to clause
37、4.1. The Packet Identifier (PID) of a Teletext stream associated with a service shall be signalled in the Program Map Table (PMT) of the Program Specific Information (PSI) for that service. The Teletext data stream shall use stream_type value 0x06 (which indicates a PES stream carrying private data)
38、. The appropriate ES_info field of the program map section describing Teletext data streams shall contain a Teletext descriptor as defined in ETSI EN 300 468 2. A service may include more than one Teletext data stream, provided that each stream has a different value of data_identifier, and that the
39、streams are distinguishable by their respective Teletext descriptors in the PSI. ETSI ETSI EN 300 472 V1.4.1 (2017-04) 8 4.1 Transport Stream (TS) packet format The standard TS packet syntax and semantics shall be followed, noting the following constraint: adaptation_field_control only the values “0
40、1“ and “10“ shall be permitted. 4.2 PES packet format The standard PES packet syntax and semantics shall be followed noting the following constraints: stream_id shall be set to “1011 1101“ meaning “private_stream_1“. PES_packet_length shall be set to the value (N 184)-6, where N is an integer, so th
41、at the PES packet finishes at the end of a Transport packet. Data_alignment_indicator shall be set to “1“ indicating that the Teletext access units are aligned with the PES packets. PES_header_data_length shall be set to “0x24“. stuffing_byte the PES header shall be followed by as many stuffing byte
42、s as are required to make up the header data length, so that the entire PES header is 45 bytes long. PES_packet_data_byte these bytes shall be coded in accordance with the PES_data_field syntax specified in clause 4.3. PTS and other optional fields may be present in the PES header, but the header le
43、ngth is always fixed for streams identified in the Program Specific Information (PSI) by the DVB Teletext descriptor (see ETSI EN 300 468 2). NOTE: See annex A. 4.3 Syntax for PES data field Table 1: Syntax for PES data field Syntax No. of bits Identifier PES_data_field() data_identifier 8 uimsbf fo
44、r(i=0;iN;i+) data_unit_id 8 uimsbf data_unit_length 8 uimsbfdata_field() Data_field for EBU Teletext Table 2: Syntax for Data_field for EBU Teletext Syntax No. of bits Identifier data_field() reserved_future_use 2 bslbf field_parity 1 bslbfline_offset 5 uimsbf framing_code 8 bslbfmagazine_and_packet
45、_address 16 bslbf data_block 320 bslbf ETSI ETSI EN 300 472 V1.4.1 (2017-04) 9 4.4 Semantics for PES data field data_identifier: this 8-bit field identifies the type of data carried in the PES packet. It shall be coded according to table 3. Table 3: data_identifier data_identifier value 0x00 to 0x0F
46、 reserved for future use 0x10 to 0x1F EBU data 0x20 to 0x7F reserved for future use 0x80 to 0xFF user defined The data_identifier shall be set to the same value for each PES packet conveying data in the same Teletext data stream. data_unit_id: this 8-bit field identifies the type of data unit. It sh
47、all be coded according to table 4. Table 4: data_unit_id data_unit_id value 0x00 to 0x01 reserved for future use 0x02 EBU Teletext non-subtitle data 0x03 EBU Teletext subtitle data 0x04 to 0x7F reserved for future use 0x80 to 0xFE user defined 0xFF data_unit for stuffing For streams identified in th
48、e PSI by the DVB Teletext descriptor (see ETSI EN 300 468 2), only values 0x02, 0x03 and 0xFF shall be permitted. data_unit_length: this 8-bit field indicates the number of bytes in the data unit following the length field. For data units carrying EBU Teletext data, this field shall always be set to
49、 0x2C. reserved_future_use: this field may be used in the future for ETSI defined extensions. As a default reserved_future_use bits shall be set to “1“. field_parity: this 1-bit flag specifies the field for which the data is intended; the value “1“ indicates the first field of a frame, the value “0“ indicates the second field of a frame. line_offset: this 5-bit field specifies the line number on which the Teletext data packet is intended to be presented if it is transcoded into the VBI. Within a field, the line_o
