SMPTE ST 336M-2007 Data Encoding Protocol Using Key-Length-Value.pdf
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1、 Copyright 2007 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved August 22, 2007 Table of Contents Page Forward . 3 1 Scope . 4 2 Conformance Notation . 4 2.1 Conformance Implementations. 5 3 Normative References . 5 4 KL
2、V Protocol 5 4.1 ANSI/SMPTE 298M Universal Label Key . 6 4.1.1 UL Designator . 8 4.1.2 Registry Designator 10 4.1.3 Structure Designator . 10 4.1.4 Version Number 10 4.1.5 Item Designator. 11 4.2 Encoding of the KLV Length Field 11 4.3 Encoding of Data Values 12 4.4 Empty Data Items 12 5 KLV Coding
3、of Individual Data Items . 12 5.1 Registers of Individual Data Items 12 5.1.1 Metadata Dictionaries . 12 5.1.2 Essence Dictionaries 13 5.1.3 Control Dictionaries. 13 5.1.4 Types Dictionaries 13 5.2 Identification of Value Data Representatives 13 6 KLV Group Coding. 14 6.1 Universal Sets. 15 6.2 Glob
4、al Sets 16 6.3 Local Sets . 19 Page 1 of 41 pages SMPTE 336M-2007Revision of SMPTE 336M-2001 SMPTE STANDARD Data Encoding Protocol Using Key-Length-Value SMPTE 336M-2007 Page 2 of 41 pages 6.4 Variable-Length Packs 21 6.5 Defined-Length Packs .23 6.6 Forbidden Use .25 7 Wrappers and Containers.25 8
5、SMPTE Labels26 9 Registered Private Information.27 Annex A (Normative) Glossary of Terms and Acronyms28 Annex B (Informative) Organization of Reference30 Annex C (Informative) Example Usage of the SMPTE UL.31 Annex D (Informative) Example of the KLV Encoding of a Single Metadata Item .32 Annex E (In
6、formative) Example of a Universal Set 33 Annex F (Informative) Example of a Global Set .34 Annex G (Informative) Example of a Local Set 35 Annex H (Informative) Example of a Variable-Length Pack.36 Annex I (Informative) Example of a Defined-Length Pack .37 Annex J (Informative) Example of a Label .3
7、8 Annex K (Informative) ASN.1 BER Length Coding 39 Annex L (Informative) ASN.1 BER Encoding of an Object Identifier Value40 Annex M (Informative) Bibliography 41 SMPTE 336M-2007 Page 3 of 41 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognize
8、d 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 Commit
9、tees. 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 Part XIII of its Administr
10、ative Practices. SMPTE 336M was prepared by Technology Committee W25 on Metadata and Wrappers. SMPTE 336M-2007 Page 4 of 41 pages 1 Scope This standard defines a byte-level data encoding protocol for representing data items and data groups. This protocol defines a data structure which is independent
11、 of the application or transportation method used. The standard defines a Key-Length-Value (KLV) triplet as a data interchange protocol for data items or data groups where the Key identifies the data, the Length specifies the length of the data and the Value is the data itself. The KLV protocol prov
12、ides a common interchange point for all compliant applications irrespective of the method of implementation or transport. The standard also provides methods for combining associated KLV triplets in data sets where the set of KLV triplets is itself coded with KLV data coding protocol. Such sets can b
13、e coded in either full form (Universal Sets) or in one of four increasingly bit-efficient forms (Global Sets, Local Sets, Variable Length Packs and Defined Length Packs). The standard provides a definition of each of these data constructs. The standard also describes implications of KLV coding inclu
14、ding the use of a SMPTE Universal Label as a value within a KLV coding triplet or whose meaning is entirely conveyed by the SMPTE UL itself. The two kinds of usage for such standalone SMPTE Universal Labels are a) as a value in a K L V construct and b) as a Key that has no Length and no Value. This
15、standard defines where SMPTE ULs may be used for each kind of construct. The standard also defines the use of KLV coding to provide a means to carry information that is registered with a non-SMPTE external agency. The encoding byte range (length of the payload) specified in this document may accommo
16、date unusually large volumes of data. Consequently, a specific application of KLV encoding may require only a limited operating data range and those details shall be defined in a relevant application document. Annex A provides a glossary of terms used in this standard. 2 Conformance Notation Normati
17、ve 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 removed, changed, or added editorially without
18、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 “Note:” The keywords “shall“ and “shall not“
19、 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, without mentioning or excluding others; or tha
20、t 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 the limits of the document. The keyword “
21、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. SMPTE 336M-2007 Page 5 of 41 pages 2.1 Conforming Impl
22、ementations 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 need not implement optional provisions (“may“) and need not implement them a
23、s described. 3 Normative References The following 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 ba
24、sed on this recommended practice are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSI/SMPTE 298M-1997, Television Universal Labels for Unique Identification of Digital Data ISO/IEC 8825-1:2002 (ITU-T X.690), Information Technology A
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