1、ETSI EN 301 775 1.2.1 (2003-05) European Sfandard (Telecommunicafions series) Digital Video Broadcasting (DVB); Specification for the carriage of Vertical Blanking Information (VBI) data in DVB bitstreams 2 ETSI EN 301 775 VI .2.1 (2003-05) The pre ent d Reference REN/JTC-DVB-144 Keywords broadcasti
2、ng, digital, DVB, SNG, TV, video ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual c
3、opies of the present document can be downloaded from: http:lwmv.etsi .arq cument may be made available in more than one electronic version or in print. In any ca e of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In c
4、ase of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this
5、and other ETSI documents is available at ha p:/pa rta I. etsi I a rgltbistat uslstatus .as p If you find errors in the present document, send your comment to: Cori vriaht Notifica tion No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction e
6、xtend to reproduction in all media. O European Telecommunications Standards Institute 2003. O European Broadcasting Union 2003. All rights reserved. DECTTM, PLUGTESTSTMand UMTSTMare Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently
7、being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI EN 301 775 VI . 2.1 (2003-05) Contents Intellectual Property Rights 4 Foreword . 4 1 Scope 5 2 References 5 3 Abbrevi
8、ations . 6 4 4.1 4.2 4.3 4.4 4.4.1 4.4.2 4.5 4.5.1 4.5.2 4.6 4.6.1 4.6.2 4.7 4.7.1 4.7.2 4.8 4.8.1 4.8.2 4.9 4.9.1 4.9.2 4.10 Coding of VBI Signals in MPEG-2 Transport Streams . 6 General issues 6 7 7 Definition of P 7 8 Semantics for PES data 8 9 9 Semantics for EBU and Inverted Teletext data field
9、 9 Data field for VPS 10 Syntax for VPS data field . 10 Semantics for VPS data field 10 Data field for WSS . 11 Syntax for WSS data field 11 Semantics for WSS data field . 11 Data field for Closed captioning 12 Syntax for Closed Captioning data field . 12 Semantics for Closed Captioning data field 1
10、2 Data field for monochrome 4:2:2 samples . 12 Syntax for monochrome data field 13 Semantics for monochrome data field 13 Combining VBI data with EN 300 472 Teletext data . 14 Syntax for PES data fiel Syntax for EBU and Inverted Teletext data field Data field for EBU and Inver Annex A (informative):
11、 Bibliography . 15 History 16 ETSI 4 ETSI EN 301 775 VI .2.1 (2003-05) 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 n
12、on-members, and can be found in ETSI SR O00 3 14: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (5). All published ETSI de
13、liverables shall include 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), Comit Europen de Normalisation ELECtr
14、otechnique (CENELEC) and 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 in
15、cluding in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose work includes the Co-ordination of its members activities in the technical, legal, progra
16、mme-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 Broadcasting Union CH-I218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 Founded in September 1993,
17、 the DVB Project is a market-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 worl
18、d, DVB fosters market-led systems, 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: Date of latest announcement of this EN (doa): Date of latest publication of new National Standar
19、d or endorsement of this EN (dop/e): Date of withdrawal of any conflicting National Standard (dow): 23 May 2003 3 1 August 2003 29 February 2004 29 February 2004 ETSI 5 ETSI EN 301 775 VI .2.1 (2003-05) 1 Scope The present document specifies a new VBI standard to be added to MPEG-2 and DVB to handle
20、 the transmission of data intended to be transcoded into the VBI of MPEG-2 decoded video. The definitions given by the present document are an extension of the format specified by EN 300 472 2. The extensions include Inverted Teletext, VPS (EN 300 23 1 4) and WSS (EN 300 294 5) data to be used for 6
21、25-line systems and Closed-Captioning (EIA-608 Revision A 6) data to be used for 525-line systems. Also, a generic format for transmitting luminance-only VBI data is defied to have a means of coping with other standard or non-standard VBI systems. The present document allows for conveying VBI data u
22、nits and EBU Teletext data units using the same elementary stream. Backwards compliance with the EN 300 472 2 is guaranteed, as the EBU Teletext as specified in EN 300 472 2 and VBI data as specified in the present document can Co-exist in the same service on separate PIDs. To cater for this, some e
23、xtensions to the SI, EN 300 468 9 have been defined. 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication andor edition number or version numb
24、er) or non-specific. For a specific reference, subsequent revisions do not apply. For 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 httn:/kiocbox.etsi .oro/Refereiice. il ISO/IEC 13 8
25、 18-1 : “Information technology - Generic coding of moving pictures and associated audio information: Systems“. ETSI EN 300 472: “Digital Video Broadcasting (DVB); Specification for conveying ITU-R System B Teletext in DVB bitstreams“. ETSI EN 300 706: “Enhanced Teletext Specification“. ETSI EN 300
26、23 1: “Television systems; Specification of the domestic video Programme Delivery Control system (PDC)“. ETSI EN 300 294: “Television systems; 625-line television Wide Screen Signalling (WSS)“. EIA-608 Revision A: “Recommended practice for Line 21 data service“. ITU-R Recommendation BT.601-1: “Encod
27、ing parameters of digital television for studios“. ITU-R Recommendation BT.656: “Interfaces for digital component video signals in 525-line and 625-line television systems operating at the 4:2:2 level of Recommendation ITU-R BT.601 (Part A)“. 21 31 41 51 61 71 SI 91 ETSI EN 300 468: “Digital Video B
28、roadcasting (DVB); Specification for Service Information (SI) in DVB systems“. ETSI 6 ETSI EN 301 775 VI .2.1 (2003-05) 3 Abbreviations For the purposes of the present document, the following abbreviations apply: cc DVB EACEM EBU EIA ETS ETSI IEC IS0 ITU MPEG PES PID PMT PSI PTS SI VBI VPS wss Close
29、d Captioning Digital Video Broadcasting European Association of Consumer Electronics Manufacturers European Broadcasting Union Electronic Industries Association European Telecommunication Standard European Telecommunications Standards Institute International Electrotechnical Commission International
30、 Standards Organization International Telecommunications Union Moving Pictures Experts Group Packetized Elementary Stream Packet Identifier Program Map Table Program Specific Information Presentation Time Stamp Service Information Vertical Blanking Interval Video Programme System Wide Screen Signall
31、ing 4 4.1 Coding of VBI Signals in MPEG-2 Transport Streams General issues The VBI data transferred through the mechanism described in this clause is intended to be transcoded into the VBI of a companion video channel of an MPEG-2 programme. However, it also is possible to transmit and transcode a V
32、BI data stream on its own, without a companion video channel. In addition it is possible for a decoder to interpret the data directly, without any intermediate transcoding into the VBI. The transmission means is generally based on EN 300 472 2. The data transfer uses the private PES packet mechanism
33、 of type private-stream-l as defined by ISO/IEC 13 8 18- 1 i. The VBI encoding and decoding should be synchronized with the companion video channel, if one is present. The VBI data stream associated with a service is identified in the Program Map Table (PMT) of the Program Specific Information (PSI)
34、 for that service. This mechanism is described in clause 4.2. The following restrictions apply to the coding of VBI data as described in the present document: - - a VBI PES packet contains data of one and only one video frame and always carries a PTS; the decoding of VBI data does not require a fram
35、e memory (i.e. a memory that stores VBI data for display in a frame other than the current). This means that VBI data present for a certain line within a certain frame never will appear in the next frame unless it is specifically coded as such again; the VBI decoding does not require a line memory (
36、i.e. a memory that stores one or more lines of VBI data for display in the current frame). This means that lines shall appear in the bitstream in the same order, as they will appear in the VBI; VBI lines that are not coded will either be set to “black“ or will have another default value defiied by t
37、he decoder; - - - a certain VBI line may never be coded twice within a frame. A line is coded using one and only one data field with the exception of lines containing monochrome 4:2:2 samples (see clause 4.9). These may be spread over several data fields adjacently coded; ETSI 7 ETSI EN 301 775 VI .
38、2.1 (2003-05) - whenever a VBI stream is coded, the VBI-data-descriptor defined in clause 4.2 shall be used in the PMT to identiSl the VBI stream. If Teletext is coded in the same stream, then at the same time a VBI Teletext descriptor shall be associated with the VBI stream; the data-identifier def
39、ined in clause 4.4 shall be set to either Ox10 to OxlF or 0x99 to Ox9B. For data-identifier values between Ox10 to OxlF, it may be possible that decoders compliant only to EN 300 472 2 are able to decode the Teletext data. They have to be robust against the non-teletext data; i.e. robust against dat
40、a units other than Ox02,Ox03, and OxFF; - - the standard Teletext buffer model is used, as is defined by EN 300 472 2 4.2 Definition of SI for VBI data streams The Packet Identifier (PID) of a VBI data stream associated with a service is identified in the Program Map Table (PMT) of the Program Speci
41、fic Information (PSI) for that service. The VBI data stream is given stream-type value 0x06, which indicates a PES stream carrying private data. If the VBI data stream contains any of the extensions defined by the present document, the appropriate ES-info-field of the program map section describing
42、VBI data streams shall contain one and only one VBI-data-descriptor as defined in EN 300 468 9. A service may include more than one VBI data stream, provided that the streams are distinguishable by their respective descriptors in the PSI. In addition a VBI Teletext descriptor shall be used if and on
43、ly if the VBI stream contains amongst others EBU Teletext data. The descriptor is needed to use languages for selecting magazines or subtitles. For the component descriptor, VBI data transported using the VBI standard is represented by stream-content and component-type values defiied in EN 300 468 9
44、. 4.3 PES packet format The standard PES packet syntax and semantics are followed noting the following constraints: stream-id PES-pac ke t-leng th set to “101 1 1101“ meaning “private-stream-1“. set to the value (N x 184) - 6, where N is an integer, so that the PES packet finishes at the end of a Tr
45、ansport packet. set to “1“ indicating that the VBI access units are aligned with the PES packets. Data-alignment-indicator PES-header-data-length set to “0x24“. stuffing-byte the PES header is followed by as many stuffing bytes as are required to make up the header data length, so that the entire PE
46、S header is 45 bytes long. PES-packet-data-byte PTS shall be present and other optional 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 VBI Teletext descriptor andor the VBI data descriptor (see EN
47、 300 468 9). these bytes are coded in accordance with the PES-data-field syntax specified below. 4.4 Definition of PES data field The PES data field is defined by PESdata-field in EN 300 472 2, table 1 with the extension of the data field to other types of data. ETSI 8 data-identifier Ox00 to OxOF 0
48、x1 O to 0x1 F 4.4.1 Syntax for PES data field Value Action decoders (see note) reserved for future use discard EBU Teletext only or EBU Teletext combined with VPS and/or WSS and/or Closed Captioning and/or VBI sample transcode EBU Teletext, VPS, WSS, Closed Captioning, VBI sample data ETSI EN 301 77
49、5 VI .2.1 (2003-05) Ox9C to OxFF Table 1 : Syntax for PES data field and/or Closed Captioning and/or VBI sample data user defined discard Captioning, VBI sample data Syntax No. of Mnem. Valid Range bits ES-data-field () data-identifier 8 uimsbf See table 2 for (I = O; i c N; i+) data-unit-id 8 uimsbf See table 3 data-unit-length 8 uimsbf Ox00 OxFF if (data-unit-id = 0x02 II data-unit-id = 0x03 II data-unit-id = OxCO II data-unit-id = OxC1) txt-data-field (); else if (data-unit-id = OxC3) vps-data-field(); else if (data-unit
