SMPTE ST 334-1-2015 Vertical Ancillary Data Mapping of Caption Data and Other Related Data.pdf

1、 Copyright 2015 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved January 2, 2015 Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 Loc

2、ation of Vertical Ancillary Data . 4 5 Format of VANC Data Packets 4 5.1 ANC Packet Header Format 4 5.2 UDW Format 5 5.3 Defined Services 5 5.4 Other Data Services . 6 5.5 Timing of Data and Video (Informative) 6 Annex A Bibliography (Informative) . 7 Annex B Format of the ANC CEA-608 Packet (Normat

3、ive) . 8 Page 1 of 8 pages SMPTE ST 334-1:2015 Revision of SMPTE 334-1-2007 SMPTE STANDARD Vertical Ancillary Data Mapping of Caption Data and Other Related Data SMPTE ST 334-1:2015 Page 2 of 8 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recogn

4、ized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices, and Engineering Guidelines, are prepared by SMPTEs Technology Co

5、mmittees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in its Standards Operatio

6、ns Manual. SMPTE ST 334-1 was prepared by Technology Committee 24TB. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this Engineering Document. However, attention is drawn to the possibility that some of

7、the elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. Introduction This section is entirely informative and does not form an integral part of this Engineering Document. The following suite of SMPTE Engine

8、ering Documents defines the carriage of Closed Caption data in production and distribution television systems: SMPTE ST 334-1 Vertical Ancillary Data Mapping of Caption Data and Other Related Data SMPTE ST 334-2 Caption Distribution Packet (CDP) Definition SMPTE RP 2007 Closed-Caption CDP and “Grand

9、 Alliance” Serial Interfaces for DTV SMPTE EG 43 System Implementation of CEA-708 and CEA-608 Closed Captioning and Program-Related Data Users should note that the data described in this standard may also be transported in KLV format according to SMPTE ST 336, or via other means. SMPTE ST 334-1:2015

10、 Page 3 of 8 pages 1 Scope This standard defines a method of mapping closed captioning and certain other related data services into the 10-bit vertical ancillary (“VANC”) data space. It specifies the structure of packets carrying CEA-708, as well as CEA-608 closed captioning data, time code data, an

11、d ATSC A/65 closed caption descriptor information, which may be carried in vertical ancillary data space, via serial data communications interfaces, or via other means. The related data services include data broadcast services intended for the public as well as broadcaster internal control and commu

12、nications. 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contains the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be remove

13、d, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “No

14、te:” The keywords “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, witho

15、ut mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within

16、the limits of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. A conformant

17、implementation according to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all recommended provisions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described. Unless other

18、wise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be the authoritative definition; Tables shall be next; followed by formal languages; then figures; and then any other language forms. 3 Normative References The f

19、ollowing standards contain provisions which, through reference in this text, constitute provisions of this recommended practice. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this recommended practice are enco

20、uraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 291-1:2011, Ancillary Data Packet and Space Formatting SMPTE ST 334-2:2015, Caption Distribution Packet (CDP) Definition SMPTE ST 334-1:2015 Page 4 of 8 pages SMPTE RP 168:2009, Defin

21、ition of Vertical Interval Switching Point for Synchronous Video Switching CEA 608-E (2008), Line 21 Data Services CEA 708-E (2013), Digital Television (DTV) Closed Captioning 4 Location of Vertical Ancillary Data The data packets shall be located in the active line portion of one line in the vertic

22、al ancillary space. Data may be located in any lines in the area from the second line after the line specified for switching, as defined in SMPTE RP 168, to the last line before active video, inclusive. For interlaced systems, the data packets carrying only Defined Data Services (see Table 1) shall

23、be placed in the vertical ancillary area of the first field and should not be repeated in the vertical ancillary area of the second field. Data packets carrying other services (see Table 2) shall be placed in the vertical ancillary area of the associated field. For progressive segmented frame system

24、s, the data packets shall be placed in the vertical ancillary area of the first segment of the frame and shall not be repeated in the vertical ancillary area of the second segment. For progressive formats, the ANC packet shall be placed in the vertical ancillary area of the frame. When the ANC packe

25、ts defined in this standard are carried in a high definition signal, they shall be carried in the Y stream. Individual data services are not assigned to any specific data lines; receiving equipment should identify and select services on the basis of their ANC DID and SDID fields. 5 Format of VANC Da

26、ta Packets Each data packet follows the format defined in SMPTE ST 291-1 for a type 2 ANC packet. It consists of the ancillary data flag (ADF), the data ID (DID), the secondary data ID (SDID), the data count (DC), the user data words (UDW), and the checksum (CS). The UDW consists of the data payload

27、 plus forward error correction overhead. 5.1 ANC Packet Header Format The ADF has the value 000h 3FFh 3FFh. The following value of DID is used for the closed captioning services defined in this standard: 161h (61h plus parity bits per SMPTE ST 291-1). A second value of DID (162h = 62h plus parity) i

28、s used for other services which are identified by this standard, and whose format is specified by recommended practices. Other data services which are internal to a broadcast network may use DID values in the ranges specified for user application data (40h-5Fh and C0h-Dfh). These DID values are not

29、registered. The specified values of DID (61h and 62h) identify type 2 ANC packets. In each packet, the SDID code identifies the type of data. Table 1 shows the values of DID and SDID for services defined within this standard. Table 2 shows the values of DID and SDID for other services. SMPTE ST 334-

30、1:2015 Page 5 of 8 pages Table 1 Defined data services Service DID SDID DC Closed captioning (CEA-708) (CDP) 61h (161h) 1 (101h) Variable CEA-608 data 61h (161h) 2 (102h) 3 (203h) Table 2 Variable-format data services Service DID SDID DC Program description (DTV) 62h (162h) 1 (101h) Variable Data br

31、oadcast (DTV) 62h (162h) 2 (102h) Variable VBI data 62h (162h) 3 (203h) Variable Note: The DID/SDID 61h/02h can only be used in nominal 30/60 fps systems. The DID/SDID 61h/01h (CDP) must be used for other fps. In all cases, the preferred method is to use the CDP 61h/01h. DC is a count of the number

32、of words in the UDW; bits b7-b0 of DC represent the number of words of user data; bits b8 and b9 are parity per SMPTE ST 291-1. For defined services such as captioning, the format of the data in the UDW is defined in this specification or in a normative reference. For other data services, the data c

33、ontent is not specified here, and the value of DC is variable. 5.2 UDW Format All data services consist of 8-bit data bytes, which are transmitted in bits b7-b0 of the 10-bit data word. Bit b8 is even parity for b7 through b0, and b9 = not b8. In addition to providing a simple error detection capabi

34、lity, this avoids transmitting data which match one of the code words 0-3 and 1020-1023 which are prohibited by SMPTE ST 291-1. The data payload for each service is inserted into the UDW of the ANC packet as a sequence of 10-bit words. The number of words is indicated in the DC field of the ANC pack

35、et header. 5.3 Defined Services The services shown in Table 1 have their format defined in this clause. The values in parentheses for DID, SDID, and DC include parity bits b8 and b9. 5.3.1 Format of the closed captioning (CEA-708) (CDP) The payload of the closed captioning (CEA-708) packet is the ca

36、ption distribution packet (CDP) defined in SMPTE ST 334-2. This packet has a variable length and shall be placed in the vertical ancillary area per Section 4. 5.3.2 Format of the CEA-608 data In NTSC video, the closed captioning, XDS, content advisory, and other services are carried in a format defi

37、ned by the CEA-608 standard. Closed captioning may be carried in line 21 of either field. XDS, content advisory and other data may be in line 21 of field 2 only. SMPTE ST 334-1:2015 Page 6 of 8 pages These can be carried in an ANC packet in a serial digital stream to allow the CEA-608 data waveform

38、to be recreated and reinserted into an NTSC signal produced by converting the DTV signal into an analog signal at a station. The format of this ANC packet is defined in Annex A, is of fixed length, and shall be placed in the vertical ancillary area per Section 4. Note: The preferred method of carryi

39、ng CEA-608 data is to place it in a CDP rather than the structure defined in Annex A. 5.4 Other Data Services Table 2 lists other data services whose format is not specified by this standard. Their DID and SDID values are specified here to ensure that they can be correctly and consistently recognize

40、d and routed. The DTV program description service carries data which pertain to the video and audio programs. Its contents are defined in SMPTE RP 207. The DTV data broadcast service carries data intended for broadcast to the public along with the video and audio programs. Its contents are the subje

41、ct of a future recommended practice. The VBI data service is intended for use in reconstituting data in the VBI of a standard-definition analog video signal produced from the digital video program. Its contents are defined in SMPTE RP 208. 5.5 Timing of Data and Video (Informative) There is no speci

42、fic provision in this standard for ensuring that the relative timing between the video and its embedded VANC data is correct. The only timing relationship that exists is created when the data are embedded in the video. Once that relationship is established, the deterministic nature of SMPTE ST 292-1

43、 or SMPTE ST 259 transport ensures that the relationship is preserved. SMPTE ST 334-1:2015 Page 7 of 8 pages Annex A Bibliography (Informative) Note: All references in this document to other SMPTE documents use the current numbering style (e.g. SMPTE ST 170:2004) although, during a transitional phas

44、e, the document as published (printed or PDF) may bear an older designation (such as SMPTE 170M-2004). Documents with the same root number (e.g. 170) and publication year (e.g. 2004) are functionally identical. ATSC A/53, Part 4:2009, ATSC Digital Television Standard, Part 4 MPEG-2 Video System Char

45、acteristics ATSC A/65:2013, Program and System Information Protocol for Terrestrial Broadcast and Cable Recommendation ITU-R BT.656-5 (12/07), 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

46、A) Recommendation ITU-R BT.1700 (02/05), Characteristics of Composite Video Signals for Conventional Analogue Television Systems SMPTE ST 125:2013, SDTV Component Video Signal Coding 4:4:4 and 4:2:2 for 13.5 MHz and 18 MHz Systems SMPTE ST 170:2004, Television Composite Analog Video Signal NTSC for

47、Studio Applications SMPTE ST 259:2008, Television SDTV Digital Signal/Data Serial Digital Interface SMPTE ST 292-1:2012, 1.5 Gb/s Signal/Data Serial Interface SMPTE ST 344:2000, Television 540 Mb/s Serial Digital Interface Archived 2006 SMPTE ST 425-1:2014, Source Image Format and Ancillary Data Map

48、ping for the 3 Gb/s Serial Interface SMPTE RP 207:2005, Transport of Program Description Data in Vertical Ancillary Data Packets SMPTE RP 208:2002, Transport of VBI Packet Data in Ancillary Data Packets Archived 2004 SMPTE RP 291-2:2013, Ancillary Data Space Use 4:2:2 SDTV and HDTV Component Systems

49、 and 4:2:2 2048 x 1080 Production Image Formats SMPTE EG 43:2009, System Implementation of CEA-708 and CEA-608 Closed Captioning and Program-Related Data SMPTE ST 334-1:2015 Page 8 of 8 pages Annex B Format of the ANC CEA-608 Packet (Normative) The data payload for CEA-608 data is 2 bytes per field. The ANC packet encapsulates these two bytes without modification, and adds a byte which identifies the VBI line and field to be used for insertion. The data count (DC) is therefore 3 (203h). Note: Implementers must be aware that CEA-608 data is field b