1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-19384-3 SANS 300472:2007Edition 2ETSI EN 300472:2003Edition V1.3.1SOUTH AFRICAN NATIONAL STANDARD Digital Video Broadcasting (DVB); Specif
4、ication for conveying ITU-R System B Teletext in DVB bitstreams This national standard is the identical implementation of ETSI EN 300472:2003 and is adopted with the permission of the European Telecommunications Standards Institute. Published by Standards South Africa 1 dr lategan road groenkloof pr
5、ivate bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 300472:2007 Edition 2 ETSI EN 300472:2003 Edition V1.3.1 Table of changes Change No. Date Scope National foreword This South African standard was approved by Natio
6、nal Committee StanSA TC 74, Communication technology, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This standard was published in April 2007. This SANS edition supersedes the first SABS edition (SABS ETS 300472:1996). ETS l EN 300 472
7、VI .3. I (2003-05) European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext in DVB bitstreams European Broadcasting Unio Union Europeenne de Radio-Television ETSl EN 300 472 V1.3.1 (2003-05) Reference RENIJTC-DVB-143 Keywords
8、 broadcasting, digital, DVB, MPEG, teletext, TV, video ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association a but non lucratif enregistree a la Sous-Prefecture de Grasse (06) No 7803188 I
9、mportant notice Individual copies of the present document can be downloaded from: htt:/lwww.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is
10、 the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSl printers of the PDF version kept on a specific network drive within ETSl Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. I
11、nformation on the current status of this and other ETSl documents is available at htt:iloortal.etsi.ordtb/status/status.as If you find errors in the present document, send your comment to: editoretsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The
12、 copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2003. O European Broadcasting Union 2003. All rights reserved. DECT, PLUGTESTS and UMTS are Trade Marks of ETSl registered for the benefit of its Members. TIPHON and the Tl
13、PHON logo are Trade Marks currently being registered by ETSl for the benefit of its Members. GPP is a Trade Mark of ETSl registered for the benefit of its Members and of the 3GPP Organizational Partners. Contents Intellectual Property Rights 4 Foreword -4 1 Scope 5 References 5 Definitions and abbre
14、viations . 5 Definitions 5 Abbreviations . 6 . Insertion of Teletext into MPEG-2 transport multiplex 6 Transport Stream (TS) packet format . 6 PES packet format 6 Syntax for PES data field . 7 Semantics for PES data field 7 5 Teletext decoder model 9 Annex A (informative): PTS transmission . 10 Hist
15、ory 11 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 3 14: “bzrellectual
16、Property Rights (IPRs); Esseiltial, or poteiltiallx Esseizrial, IPRs izorijied to ETSI ill respect of ETSI staizdai-ds“. which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (httn:/ehapn.rt.oi-c/IPR/hone.ap). All published ETSI deliverables shall include
17、information which directs the reader to the above source of information. Foreword This European Standard (Telecommunications series) has been produced by Joint Technical Committee (JTC) Broadcast of the European Broadcasting Union (EBU). ComitC Europ6en de Normalisation ELECtrotechnique (CENELEC) an
18、d the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorand
19、um of Understanding also CENELEC. which is responsible for the standardization of radio and teleision receivers. The EBU is a professional association of broadcasting organizations whose work includes the co-ordination of its members activities in the technical. legal. programme-making and programme
20、-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area: its headquarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +412271721 11 Fax: +41 22 717 24 81 Founded in September 1993. the DVB Project is a marke
21、t-led consortium of public and private sector organizations in the television industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital television services. Now comprising over 200 organizations from more than 25 countries around the world. DVB fosters market-led s
22、ystems. which meet the real needs. and economic circumstances. of the consumer electronics and the broadcast industry. National transposition dates Date of adoption of this EN: 23 May 2003 Date of latest announcement of this EN (doa): 3 1 August 2003 Date of latest publication of new National Standa
23、rd or endorsement of this EN (dople): 29 February 2004 Date of withdrawal of any conflicting National Standard (dow): 29 February 2004 5 ETSl EN 300 472 V1.3.1 (2003-05) 1 Scope The present document specifies the method by which ITU-R System B Teletext (ITU-R Recommendation BT.653 3). also known as
24、EBU Teletext (see EN 300 706 4). may be carried in DVB bitstreams. This transport mechanism 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 wit
25、h existing TV receivers with Teletext decoders: - the maximum data rate for each Teletext senlice 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 wit
26、h respect to the video (i.e. to within or near frame accuracy). A more general data transport mechanism 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. References The following document
27、s contain provisions which. through reference in this text. constitute provisions of the present document. * References are either specific (identified by date of publication and/or edition number or version number) or non-specific. * For a specific reference. subsequent revisions do not apply. * Fo
28、r a non-specific reference. the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:l/dochox.rtsi.orr/Refrrznce. ill ISOREC 138 18-1 : “Information technology - Generic coding of moving pictures and associated audi
29、o information: Systems“. PI ETSI EN 300 468: “Digital Video Broadcasting (DVB): Specification for Service Information (SI) in DVB systems“. 31 ITU-R Recommendation BT.653: “Teletext systems“ 4 ETSI EN 300 706: “Enhanced Teletext specification“ Definitions and abbreviations Definitions For the purpos
30、es of the present document. the following terms and definitions apply. MPEG-2: Refers to the standard ISOREC 13818. Systems coding is defined in part 1 I. Video coding is defined in part 2. Audio coding is defined in part 3 of ISOIIEC 1381 8. section: syntactic structure used for mapping all service
31、 information defined in EN 300 468 into ISOLEC 1381 8-1 Transport Stream (TS) packets service: sequence of programmes under the control of a broadcaster which can be broadcast as part of a schedule 6 ETSI EN 300 472 V1.3.1 (2003-05) Teletext descriptor: See EN 300 468 ?I. it is used in the Program S
32、pecific Information (PSI) Program Map Table (PMT) to identify streams which carry EBU data. The descriptor is located in a program map section following the relevant ES-info-length field. 3.2 Abbreviations For the purposes of the present document. the following abbreviations apply: DVB MPEG PES PID
33、PMT PSI PTS SI TS TV VB I Digital Video Broadcasting Moving Pictures Expert group Packetized Elementary Stream Packet IDentifier Program Map Table Program Specific Information Presentation Time Stamp Service Information Transport Stream Television Vertical Blanking Interval Insertion of Teletext int
34、o MPEG-2 transport multiplex Teletext data are conveyed in Packetized Elementary Stream (PES) packets which are canied by Transport Stream (TS) packets as defined in ISO/IEC 1381 8-1 I. The Packet Identifier (PID) of a Teletext stream associated with a service is identified in the Program Map Table
35、(PMT) of the Program Specific Information (PSI) for that service. The Teletext data stream is given stream-type value 0x06 (which indicates a PES stream carrying private data). The appropriate ES-info field of the program map section describing Teletext data streams shall contain a Teletext descript
36、or as defined in EN 300 468 ?I. A service may include more than one Teletext data stream. provided that each stream has a different value of data-identifier. and that the streams are distinguishable by their respective Teletext descriptors in the PSI. Transport Stream (TS) packet format The standard
37、 TS packet syntax and semantics are followed. noting the following constraint: adaptation-field-control only the values “01“ and “10“ are permitted. 4.2 PES packet format The standard PES packet syntax and semantics are followed noting the following constraints: stream-id set to “ 101 1 1 101“ meani
38、ng “private-stream-1 “. PESgacket-length set to the value (N x 184)-6. where N is an integer. so that the PES packet finishes at the end of a Transport packet. Data-alignment-indicator set to “ 1“ indicating that the Teletext access units are aligned with the PES packets. PES-header-data-length set
39、to “0x24“. stuffingbyte the PES header is followed by as many stuffing bytes 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 are coded in accordance with the PES-data-field syntax specified below. PTS and other optio
40、nal fields may be present in the PES header. but the header length is always fixed for streams identified in the Program Specific Information (PSI) by the DVB Teletext descriptor (see EN 300 468 ?I). NOTE: See annex A. Syntax for PES data field Table 1 : Syntax for PES data field Data-field for EBU
41、Teletext Table 2: Syntax for Data-field for EBU Teletext Syntax 4.4 Semantics for PES data field data-identifier: this 8-bit field identifies the type of data carried in the PES packet. It is coded as in table 3: Table 3: data-identifier PES-data-field() data-identifier 8 uimsbf for(i=O;iN;i+) data-
42、unit-id 8 uimsbf data-unit-length 8 uimsbf data-field() 1 No. of bits Syntax The data-identifier shall be set to the same value for each PES packet conveying data in the same Teletext data stream. Identifier datafield() reserved-future-use 2 bslbf field-parity 1 bslbf line-offset 5 uimsbf framing-co
43、de 8 bslbf magazine-and-packet-address 16 bslbf data-block 320 bsl bf 3 No. of bits Identifier 8 ETSl EN 300 472 V1.3.1 (2003-05) data-unit-id: this 8-bit field identifies the type of data unit. It is coded as in table 4: Table 4: data-unit-id For streams identified in the PSI by the DVB Teletext de
44、scriptor (see EN 300 468 2). only values Ox02.0x03 and OxFF are permitted. data-unit-id 0x00 to 0x01 0x02 0x03 0x04 to Ox7F 0x80 to OxFE OxFF 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
45、field shall always be set to Ox2C. value reserved for future use EBU Teletext non-subtitle data EBU Teletext subtitle data reserved for future use user defined data-unit for stuffing reserved-future-use: this field may be used in the future for ETSI defined extensions. As a default reserved-future-u
46、se bits are 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 pack
47、et is intended to be presented if it is transcoded into the VBI. Within a field. the line-offset numbering shall follow a progressive incremental order except for the undefined line-offset value “0“. The toggling of the field-parity flag indicates a new field. The line-offset is coded as in table 5:
48、 Table 5: line-offset Only values 0x00 and 0x07 to 0x1 6 are permitted for EBU Teletext data-units in streams identified in the PSI by the DVB Teletext descriptor. see EN 300 468 ?I. line-offset Ox00 0x01 to 0x06 0x07 0x08 Ox1 6 0x1 7 to 0x1 F framingcode, magazine-and-packet-address. data-block: th
49、ese fields correspond to the 43 bytes following the clock-run-in sequence of an EBU Teletext data packet as defined in ITU-R Recommendation BT.653 3. and also in EN 300 706 4. Data packets are inserted in the same order as they are intended to arrive at the Teletext decoder or to be transcoded into the VBI. Data bits are inserted in the PES packet in the same order as they would appear in the VBI. e.g. the framing code is 1 1 1001 00. Meaning field-parity = 1 Line number undefined reserved for future use Line number = 7 Line number = 8 Line n
