SMPTE ST 400-2012 SMPTE Labels Structure.pdf

1、 Copyright 2012 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved August 27, 2012 Table of Contents Page Foreword . 2 Intellectual Property 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 SMPTE Labels Struc

2、ture 4 4.1 Individual Classes of Labels 5 4.2 SMPTE Labels Register Structure and Format . 8 5 Labels Register Maintenance 12 5.1 Register Version Information . 12 5.2 Register Management and Compatibility Requirements . 12 5.3 Register Availability 13 Annex A Glossary of Terms (Normative) . 14 Anne

3、x B Registration Criteria (Normative) . 15 B.1 Criteria for Modifications to Entries in Classes 1-7 and 12 15 B.2 Criteria for Modifications to Entries in Class 13 . 15 B.3 Criteria for Modifications to Entries in Class 14 . 16 Annex C Organization of References (Informative) . 17 Annex D Bibliograp

4、hy (Informative) . 18 Page 1 of 18 pages SMPTE ST 400:2012 Revision of SMPTE 400M-2004 SMPTE STANDARD SMPTE Labels Structure SMPTE ST 400:2012 Page 2 of 18 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization

5、. 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 Committees. Participation in these Commi

6、ttees 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 Part XIII of its Operations Manual. SMPTE ST 400 was prepare

7、d by Technology Committee Metadata and Registers Committee, 30MR. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this Standard. However, attention is drawn to the possibility that some of the elements of

8、 this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. SMPTE ST 400:2012 Page 3 of 18 pages 1 Scope This standard defines the structure of a register of labels as defined by SMPTE ST 336. These labels may be used in a ra

9、nge of applications such as production workflow applications, data exchange formats, and archival asset management systems. The standard normatively defines universal identifiers, label names, definitions, and standardized symbols, as well as other normative and informative fields. Applications of i

10、ndividual entries will vary but, when used, shall conform to the definitions and formats in the labels register. 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“. Info

11、rmative text is text that is potentially helpful to the user, but not indispensable, and can be removed, 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 Intr

12、oduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “Note:” 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 “shou

13、ld not“ indicate that, among several possibilities, one is recommended as particularly suitable, without 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 deprecate

14、d but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within 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 “res

15、erved” and in addition indicates that the provision will never be defined in the future. A conformant 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

16、 need not implement optional provisions (“may“) and need not implement them as described. Unless otherwise 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; follo

17、wed by formal languages; then figures; and then any other language forms. 3 Normative References Note: All references in this document to other SMPTE documents use the current numbering style (e.g. SMPTE ST 298:2009) although, during a transitional phase, the document as published (printed or PDF) m

18、ay bear an older designation (such as SMPTE 298-2009). Documents with the same root number (e.g. 298) and publication year (e.g. 2009) are functionally identical. The following standards contain provisions that, through reference in this text, constitute provisions of this standard. At the time of p

19、ublication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 400:2012 Page 4 of 18 pages SMPTE ST 298

20、:2009, Universal Labels for Unique Identification of Digital Data SMPTE ST 336:2007, Data Encoding Protocol Using Key-Length-Value SMPTE ST 2029:2009, Uniform Resource Names for SMPTE Resources W3C Recommendation - Namespaces in XML 1.0 (Second Edition), World Wide Web Consortium, 16 August 2006. ht

21、tp:/www.w3.org/TR/REC-xml-names/ 4 SMPTE Labels Structure SMPTE labels defined in this standard shall be 16-byte “SMPTE Labels“ as defined in SMPTE ST 336. The SMPTE labels structure provides flexibility in capturing data and exchanging it among applications through a standardized hierarchy of unive

22、rsal labels (ULs) that uniquely identify the labels, grouped to aid their management within a small but comprehensive number of classes. Label classes are collections of labels with common characteristics or attributes. Additional classes are provided for user-defined public, private, and experiment

23、al labels. The labels register defined by this document provides two methods of referencing an individual item. The first is to use a unique, two-part, 16-byte universal label that is numerical (and hence language independent). The second method of referencing an item is to use its assigned symbol,

24、which is a name that conforms to computer language syntax restrictions. Symbols are intended for use in computer languages such as the Extensible Markup Language (XML). The symbol shall be unique within a namespace that has been defined according to Section 4.2.7. Note: The symbol, together with its

25、 namespace defined in Section 4.2.7, forms a unique identifier like the UL. The KLV coding of data items and groups of data items is defined in SMPTE ST 336. The structure of the metadata element dictionary is defined in SMPTE ST 335, including provision for labels for use as values whose meaning is

26、 entirely covered by the definition of the label itself. This document defines the structure of a register for label entries. The associated labels register includes all entries which have been approved according to the specific procedures defined in Annex B. The exact format of the universal label

27、shall be as defined in SMPTE ST 336. The first eight bytes of the universal label shall consist of the UL Header (2 bytes) and UL designator (6 bytes). The UL designator shall identify the item as belonging to a specific SMPTE register of a given category, structure, and version. The second eight by

28、tes shall form the item designator as defined in SMPTE ST 336. The item designator shall be used to uniquely identify the meaning or definition of the item in the register. The labels register shall be organized into nodes, leaves and children. The register classes form class nodes and below these a

29、re further nodes at each subclass. To aid the management of the register, these nodes and subnodes shall be assigned a universal label, so as to give clear breaks in the structure. Entries within a subclass form leaves, which are the label descriptions. The universal labels used in the labels regist

30、er defined by this document shall be constructed as shown in Table 1, which complies with SMPTE ST 336. SMPTE ST 400:2012 Page 5 of 18 pages Table 1 Construction of SMPTE universal labels Byte Position Description Value Meaning UL Header 1 Object identifier 06h Object identifier tag per SMPTE ST 298

31、 2 UL length 0Eh The byte length of the object identifier value is 14 bytes. UL designator 3 UL code 2Bh The administering organization is an ISO organization. 4 UL subcode 34h The delegated organization is SMPTE. 5 Registry category designator 04h The registry category is labels. 6 Registry designa

32、tor 01h Labels structure. 7 Structure designator 01h The register structure conforms to this SMPTE standard. 8 Version number 01h to 7Fh This indicates the version number of the register. 9-16 Item designator Defined by the labels register This identifies a specific label within the labels register.

33、 Note: As defined in SMPTE ST 298, a value of 00h at any position in a UL is treated as a terminator and all further values within that UL are required to be zero also. 4.1 Individual Classes of Labels Within the labels register, labels shall be organized into a hierarchical structure, where each is

34、 assigned to a labels class as shown in the overview of Figure 1. The initial set of labels classes in this standard consists of: Class 1: Identification and location labels Class 2: Administration labels Class 3: Interpretive labels Class 4: Parametric labels Class 5: Process labels Class 6: Relati

35、onal labels Class 7: Spatio-temporal labels Class 12: Compound labels Class 13: Organizationally registered for public use Class 14: Organizationally registered as private Class 15: Experimental These classes are further subdivided as described in the sections below. The number of labels classes can

36、 be extended in the future to a maximum of 127, and the class numbers that have not been assigned here shall be reserved for use by SMPTE. SMPTE ST 400:2012 Page 6 of 18 pages The processes for registration of new labels shall be as specified in normative Annex B. Byte 9 of the UL identifies which o

37、f these labels classes a label belongs to. Subsequent bytes enable the hierarchical identification of subclasses. Figure 1 Labels class structure 4.1.1 Class 1: Identification and Location Labels Labels in this class shall primarily carry information about identification and location. Labels in this

38、 class shall include information about identifiers and locators with both global and local scope. Sub-classes in this Class include: Object Identifiers Device Identifiers Media Locations Other subclasses may be added through the process defined in Annex B.1.1. 4.1.2 Class 2: Administration Labels La

39、bels in this class shall primarily identify administrative or business information including authorization usage and encryption. Sub-classes in this Class include: Security Classification Encryption Types Other subclasses may be added through registration per Annex B.1.1. SMPTE Labels Register Ident

40、ification Interpretation Process Spatio-Temporal Organizationally Registered for Public Use Experimental (Transient) Administration Parametric Relational Organizationally Registered as Private 1 3 5 7 13 15 14 6 4 2 12 Compound SMPTE ST 400:2012 Page 7 of 18 pages 4.1.3 Class 3: Interpretive Labels

41、Labels in this class primarily carry information that defines how data is interpreted. Labels in class 3 shall be principally used for identifying catalogues, thesauri and other items which can be used to provide terms for either human or machine application. Sub-classes in this Class include: Funda

42、mental (such as length and time systems) Descriptive (human-assigned collections of key-words) Categorization (identifying a category set) Descriptors (machine-assigned or computed) Other subclasses may be added through registration per Annex B.1.1. 4.1.4 Class 4: Parametric Labels Labels in this cl

43、ass shall primarily carry information that describes the technical characteristics of devices or systems. Sub-classes in this Class include: Essence Encoding Characteristics Container Encoding Characteristics Test Parameter Sets Compression Coding Characteristics Other subclasses may be added throug

44、h registration per Annex B.1.1. 4.1.5 Class 5: Process Labels Labels in this class shall primarily carry information that describes how the essence was originated or processed. Sub-classes in this Class include: Process Indicators Manipulation Kinds Downstream Processing History Types Enhancement or

45、 Modification Processes Processor Settings (device-specific) Other subclasses may be added through registration per Annex B.1.1. 4.1.6 Class 6: Relational Labels Labels in this class shall primarily carry information that describes a class of relationships between objects. Sub-classes in this Class

46、include: Generic Relationships Relative Relationships Object to Object Relationships Relationship Structures Other subclasses may be added through registration per Annex B.1.1. SMPTE ST 400:2012 Page 8 of 18 pages 4.1.7 Class 7: Spatio-Temporal Labels in this class shall primarily carry information

47、about aspects of time, place, or space. Sub-classes in this Class include: Position and Space Vector Systems Image Positional Information Distance and Angle Specifications Delay and Latency Kinds Other subclasses may be added through registration per Annex B.1.1. 4.1.8 Class 12: Compound Labels in t

48、his class shall primarily carry information that combines information from multiple classes. This class is intended for labels whose role is to identify entities that cannot be accommodated in a single class. Sub-classes may be added through registration per Annex B.1.1. 4.1.9 Class 13: Organization

49、ally registered for public use Labels in this class shall consist of items that have been registered by a specific organization and are therefore reserved and managed separately from the other classes (1-7 and 12) of labels. Subclasses and labels used by the class 13 registrant shall be published in the labels register. Class 13 labels shall be managed by the SMPTE Registration Authority and its approval shall be consistent with Annex B.2. 4.1.10 Class 14: Organizationally regist