SMPTE ST 2094-2-2017 Dynamic Metadata for Color Volume Transform - KLV Encoding and MXF Mapping.pdf

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1、 Approved January 6, 2017 Copyright 2017 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 SMPTE ST 2094-2:2017 SMPTE STANDARD Dynamic Metadata for Color Volume Transform KLV Encoding and MXF Mapping Page 1 of 26 pages Table of Contents

2、Page Foreword . 2 Intellectual Property 2 Introduction . 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 Terms and Definitions 4 4.1 DMCVT . 4 4.2 SMPTE ST 2094 Application Document 4 5 Notations 4 6 Encoding of SMPTE ST 2094 Metadata Sets . 5 6.1 KLV-Encoded DMCVT Application

3、Sets . 5 6.2 DMCVT Generic Set 1 6 6.3 DMCVT Application 1 Set . 7 6.4 DMCVT Application 2 Set . 8 6.5 DMCVT Application 3 Set . 9 6.6 DMCVT Application 4 Set . 10 7 Mapping Metadata Sets to MXF Essence Container 12 7.1 Using the MXF Constrained Generic Container . 12 7.2 Metadata Essence Element Co

4、ding . 13 7.3 SMPTE Essence Container Label 14 7.4 Data Essence Coding Item . 14 7.5 DMCVT Target SubDescriptor 15 Annex A ULs for Local Tags (Normative) . 17 Annex B DMCVT Application Set Examples (Informative) . 20 Bibliography (Informative) . 26 SMPTE ST 2094-2:2017 Page 2 of 26 pages Foreword SM

5、PTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized 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

6、, Recommended Practices, and Engineering Guidelines, are prepared by SMPTEs Technology Committees. 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 Engin

7、eering Documents are drafted in accordance with the rules given in its Standards Operations Manual. SMPTE ST 2094-2 was prepared by Technology Committee 31FS. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation

8、of this Engineering Document. However, attention is drawn to the possibility that some of 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 n

9、ot form an integral part of this Engineering Document. The SMPTE ST 2094 suite of documents defines metadata for use in color volume transforms of content. This document specifies: The encoding of SMPTE ST 2094 metadata sets using Key-Length-Value (KLV) structures, The MXF essence container for usin

10、g this essence with MXF files. Metadata items are encoded in data types corresponding to those used in referenced SMPTE ST 2094 documents, with some exceptions. Value ranges, array bounds, and allowed item combinations are specified in the referenced SMPTE ST 2094 documents and are not duplicated in

11、 this document. Section 6 specifies the encoding of SMPTE ST 2094 metadata sets using the Key-Length-Value data encoding protocol (KLV), defined in SMPTE ST 336. Section 7 defines the coding of the metadata essence element, the essence container label, and the essence descriptor, for MXF Essence Con

12、tainers containing DMCVT Application Sets. SMPTE ST 2094-2:2017 Page 3 of 26 pages 1 Scope The SMPTE ST 2094 suite of documents defines metadata for use in color volume transforms of content. SMPTE ST 2094-2 specifies Key-Length-Value (KLV) representations of metadata sets defined in SMPTE ST 2094-1

13、0, SMPTE ST 2094-20, SMPTE ST 2094-30, and SMPTE ST 2094-40. SMPTE ST 2094-2 specifies frame-based mapping of KLV-encoded SMPTE ST 2094 metadata sets into the MXF generic container. SMPTE ST 2094-2 specifies the key and value fields of the essence elements, the essence container label and the essenc

14、e descriptor. 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 rem

15、oved, 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

16、“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 “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, wi

17、thout 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 with

18、in 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 conforma

19、nt 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 ot

20、herwise 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; then formal languages; then figures; and then any other language forms. 3 Normative References The follo

21、wing standards contain provisions, which, through reference in this text, constitute provisions of this engineering document. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this engineering document are encoura

22、ged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 336:2007, Data Encoding Protocol Using Key-Length-Value SMPTE ST 377-1:2011, Material Exchange Format (MXF) File Format Specification SMPTE ST 2094-2:2017 Page 4 of 26 pages Amendment 1:

23、2012 to SMPTE ST 377-1:2011 Amendment 2:2012 to SMPTE ST 377-1:2011 SMPTE ST 379-2:2010, Material Exchange Format (MXF) MXF Constrained Generic Container SMPTE ST 2094-1:2016, Dynamic Metadata for Color Volume Transform Core Components SMPTE ST 2094-10:2016, Dynamic Metadata for Color Volume Transfo

24、rm Application 1 SMPTE ST 2094-20:2016, Dynamic Metadata for Color Volume Transform Application 2 SMPTE ST 2094-30:2016, Dynamic Metadata for Color Volume Transform Application 3 SMPTE ST 2094-40:2016, Dynamic Metadata for Color Volume Transform Application 4 4 Terms and Definitions For the purposes

25、 of this document, the following terms and definitions apply. 4.1 DMCVT SMPTE ST 2094 (Dynamic Metadata for Color Volume Transform) 4.2 SMPTE ST 2094 Application document SMPTE ST 2094 document defining a SMPTE ST 2094 application, such as one of SMPTE ST 2094-10, SMPTE ST 2094-20, SMPTE ST 2094-30,

26、 SMPTE ST 2094-40 5 Notations Table columns have the meanings as defined in Table 1. All columns are not present in all tables. SMPTE ST 2094-2:2017 Page 5 of 26 pages Table 1 Definition of Table Headings Table heading Definition Item Name Name of this set or metadata item as indicated in the defini

27、ng document Type The entry shall have this data type Len Length of the value field for this entry, in bytes, according to the data type, where n, if present, represents number of elements in an array Local Tag Hexadecimal value of the local tag that identifies this entry Req Req indicates that the i

28、tem is always present. This indicator maps to the isOptional entry in the SMPTE Groups Register, where isOptional corresponds to table entry != “Req“. Opt indicates that the item can be present or omitted. Opt* indicates that this item is present or omitted depending on the presence or value of othe

29、r items. This is detailed in Section 6. Den The denominator shall have this specified value (applies only to the Rational data type) Definition Description of this entry Symbol The registry symbol that is associated with this item Kind The kind of the registry entry Item UL The SMPTE Universal Label

30、 that shall be associated with this item 6 Encoding of SMPTE ST 2094 Metadata Sets 6.1 KLV-Encoded DMCVT Application Sets When a metadata set defined by a SMPTE ST 2094 Application document is KLV-encoded, it is KLV-encoded using an DMCVT Application Set, which is specific to the SMPTE ST 2094 Appli

31、cation. The DMCVT Application Sets for SMPTE ST 2094-10, SMPTE ST 2094-20, SMPTE ST 2094-30, and SMPTE ST 2094-40 shall be as defined in Sections 6.3 through 6.6, respectively. Each DMCVT Application Set shall encode exactly one metadata set as defined in the corresponding SMPTE ST 2094 Application

32、document. Each DMCVT Application Set shall be a local set, as defined in SMPTE ST 336. The set key indicates the Application Identifier and Application Version. The set length field shall be 4 bytes long. The local tag and local length fields, as defined in SMPTE ST 336, shall be 2 bytes long. The l

33、ocal tag values shall map to SMPTE Universal Labels (ULs) and Symbols as specified in Table A.2 in Annex A. Note: Local tags in local sets outside MXF Header Metadata cannot be dynamically allocated. SMPTE ST 2094-2:2017 Page 6 of 26 pages Each DMCVT Application Set shall be a subclass of the DMCVT

34、Generic Set 1, which is defined in Section 6.2. For each item defined in the DMCVT Application Set, the items name, presence, value, and default value, if any, shall be as specified in the SMPTE ST 2094 Application document, unless otherwise specified for the DMCVT Application Set. The metadata grou

35、p headings specified in the SMPTE ST 2094 Application document are not encoded. Items can be in any order within the DMCVT Application Set, unless otherwise specified. Multi-byte values shall be coded as big-endian (most significant byte first), which is defined in SMPTE ST 377-1. Multi-dimensional

36、items are represented as one-dimensional. The values of coordinates and sampled functions, defined in SMTE ST 2094-1, shall be ordered u, v, or x, y, or x1, y1, x2, y2 The values of matrices and two-input sampled functions, defined in SMTE ST 2094-1, shall be ordered z11, z12 z MN, where the number

37、of columns (N) is the number of elements (n) in the item, divided by the number of rows (M). Decimal numbers with fractions are encoded using the Rational data type, unless otherwise stated. The denominator is specified in column Den, and corresponds to the increment value used in the SMPTE ST 2094

38、Application document. When comparing with representations using other increment values, the values should be rounded to the larger increment value before comparing. Example: Average MaxRGB is specified as a multiple of 0.00001, so that 0.004 is encoded as 400 / 100 000. Sets and items are listed in

39、the SMPTE Groups Register and the SMPTE Metadata Elements Dictionary using the names, symbols, types, kinds, ULs, and definitions found in this document. Annex B provides examples of DMCVT Application Sets. 6.2 DMCVT Generic Set 1 The DMCVT Generic Set 1 shall be an abstract class as defined in SMPT

40、E ST 377-1. The metadata items defined in SMPTE ST 2094-1 shall be encoded as defined in Table 3. The Application Version item defined in SMPTE ST 2094-1 shall be named Application Version Number in the DMCVT Generic Set 1. (An Application Version item already exists in the SMPTE Metadata Elements D

41、ictionary.) The Backwards Version item is not defined in any SMPTE ST 2094 Application document, may be present, and shall indicate the lowest Application Version for which this metadata set is valid. The value shall be in the range 0 to the value of the Application Version Number. The default value

42、 is the value of the Application Version Number. For other items defined in the DMCVT Generic Set 1, The item shall be present, omitted, or optional, as specified in the SMPTE ST 2094 Application document that corresponds to the DMCVT Application Set using the DMCVT Generic Set 1, and The items name

43、, value and default value, if any, shall be as specified in SMPTE ST 2094-1, unless otherwise specified in the SMPTE ST 2094 Application document. The group nodes and the set key shall have the ULs defined in Table 2. These are listed in the SMPTE Groups Register. SMPTE ST 2094-2:2017 Page 7 of 26 p

44、ages Table 2 Group Node and Set Key for DMCVT Sets Item Name Symbol Kind Item UL Color Transform Sets ColorTransformSets NODE 06.0E.2B.34.02.7F.01.01.05.31.00.00.00.00.00.00 DMCVT Generic Sets DMCVTGenericSets NODE 06.0E.2B.34.02.7F.01.01.05.31.01.00.00.00.00.00 DMCVT Generic Set 1 DMCVTGenericSet1

45、LEAF 06.0E.2B.34.02.7F.01.01.05.31.01.01.00.00.00.00 DMCVT Application Sets DMCVTApplicationSets NODE 06.0E.2B.34.02.7F.01.01.05.31.02.00.00.00.00.00 Table 3 DMCVT Generic Set 1 Item Name Type Len Local Tag Req Den Definition DMCVT Generic Set 1 Set key 16 Req Identifies a DMCVT Generic Set 1 Length

46、 BER length 4 Req Set length (up to 180 bytes) Application Identifier UInt8 1 36.01 Req Identifying an application and its defining document in the SMPTE ST 2094 suite Application Version Number UInt8 1 36.02 Req The Application Version of the identified SMPTE ST 2094 application Backwards Version U

47、Int8 1 36.03 Opt The lowest Application Version for which this metadata set is valid Time Interval Start UInt32 4 36.04 Opt* Start point of the portion of image essence for which the metadata set is specified, as an index Time Interval Duration UInt32 4 36.05 Opt* Duration of the portion of image es

48、sence for which the metadata set is specified, as a count of index positions Upper Left Corner UInt16Array 8+ 2*2 36.06 Opt* Coordinate of the top-left pixel of the Processing Window Lower Right Corner UInt16Array 8+ 2*2 36.07 Opt* Coordinate of the bottom-right pixel of the Processing Window Window

49、 Number UInt8 1 36.08 Opt* Identifier of the Processing Window Targeted System Display Primaries RationalArray 8+ 8*6 36.09 Opt* 10 000 xy chromaticity coordinates of the three primaries of the targeted system display Targeted System Display White Point Chromaticity RationalArray 8+ 8*2 36.0A Opt* 10 000 xy chromaticity coordinate of the targeted system displays white point Targeted System Display Maximum Luminance Rational 8 36.0B Opt* 100 Maximum luminance of the targeted systems display Targeted System