1、 Copyright 2008 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved February 15, 2008 Table of Contents Page Foreword . 2 1 Scope 3 2 Conformance Notation 3 3 Normative References 3 4 Glossary of Acronyms and Terms. 4 5 Ster
2、eoscopic Picture Track File Structure. 4 6 MainStereoscopicPicture Element 5 7 Composition Playlist Constraints 6 7.1 CPL Reels . 6 7.2 MainStereoscopicPicture Assets 6 7.2.1 Edit Rate 6 7.2.2 Frame Rate 6 8 Schema . 6 9 Sample (Informative) 7 Annex A Stereoscopic Picture Sub-Descriptor (Normative)
3、. 8 Annex B Biblography (Informative) 10 Page 1 of 10 pages SMPTE 429-10-2008SMPTE STANDARD D-Cinema Packaging Stereoscopic Picture Track FileSMPTE 429-10-2008 Page 2 of 10 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards develo
4、ping 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 Committees. Participatio
5、n 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 Administrative Practices. S
6、MPTE Standard 429-10 was prepared by Technology Committee DC28. SMPTE 429-10-2008 Page 3 of 10 pages 1 Scope This document provides the definition of a single MXF file design for Stereoscopic Picture content wrapping. It also defines a new Composition Playlist (CPL) extension element to reference su
7、ch Stereoscopic Picture Track File. 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 indispe
8、nsable, 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 Introduction, any section explicitly labeled as “Informative“ or individual parag
9、raphs 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 “should not“ indicate that, among several possibilities, one is recommended as par
10、ticularly 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 deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of a
11、ction 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 “reserved” and in addition indicates that the provision will never be defined in
12、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 need not implement optional provisions (“may“) and need not implement them a
13、s described. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this
14、standard 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 SMPTE 377M-2004, Television Material Exchange Format (MXF), File Format Specificati
15、on SMPTE 429-3-2006, D-Cinema Packaging Sound and Picture Track File SMPTE 429-7-2006, D-Cinema Packaging Composition Playlist SMPTE RP 210, Metadata Dictionary Registry of Metadata Element Descriptions World Wide Web Consortium (W3C) (2004, February 4) Extensible Markup Language (XML) 1.0 (Third Ed
16、ition), see http:/www.w3.org/TR/2004/REC-xml-20040204/ World Wide Web Consortium (W3C) (2004, October 28) XML Schema Part 1: Structures (Second Edition), see http:/www.w3.org/TR/2004/REC-xmlschema-1-20041028/ SMPTE 429-10-2008 Page 4 of 10 pages World Wide Web Consortium (W3C) (2004, October 28) XML
17、 Schema Part 2: Datatypes (Second Edition), see http:/www.w3.org/TR/2004/REC-xmlschema-2-20041028/ Internet Engineering Task Force (IETF) (1996, November), RFC 2396 Uniform Resource Identifiers (URI): Generic Syntax Internet Engineering Task Force (IETF) (2005, July), RFC 4122 A Universally Unique I
18、dentifier (UUID) URN Namespace 4 Glossary of Acronyms and Terms The general glossary of acronyms, terms and data types used in the MXF specification is given in SMPTE 377M. It is not repeated here to avoid any divergence of meaning. CPL Composition Playlist MXF Material eXchange Format URI Uniform R
19、esource Identifier XML eXtensible Markup Language 2D Non-stereoscopic 5 Stereoscopic Picture Track Files Structure The starting point of this stereoscopic picture packaging method is a single “Stereoscopic Picture Essence Stream” corresponding to the frame based interleaving of the two sequences of
20、frames associated respectively with the left eye and the right eye as presented in Figure 1: “Left eye frame” #1 “Left eye frame” #2 “Left eye frame” #n “Right eye frame” #1 “Right eye frame” #2 “Right eye frame” #n Frame #1 Frame #2 Frame #3 Frame #4 Frame #(2n-1) Frame #2n Figure 1 Stereoscopic Pi
21、cture Essence Stream Structure This single Stereoscopic Picture Essence Stream shall contain the same number of left and right frames and shall be wrapped according to SMPTE 429-3, with the constraint that the KLV Fill item shall not be used between the left frame and the right frame of the same fra
22、mes pair. The left frame shall be the first frame in the left/right frames pair as presented in the Figure 1 above. The Picture Essence Descriptor shall have a strong reference to a Stereoscopic Picture Essence Sub-Descriptor, defined in Annex A. This Stereoscopic Picture Essence Sub-Descriptor shal
23、l be used to identify a Track File as being a Stereoscopic Picture Track File belonging to this standard. The Sample Rate property of the Picture Essence Descriptor shall be set to the frame rate of the essence stream. The Edit Rate in the Picture Track of the MXF header Packages shall be half the S
24、ample Rate. The Index Table shall use Edit Units that are defined for the left/right frames pairs and as illustrated in Figure 2. The Index Start Position of the first Index Table Segment shall index the position of the first frame (which is a left eye frame) of the stereoscopic picture track. SMPTE
25、 429-10-2008 Page 5 of 10 pages K L V Content Package K L V K L V Content Package K L V K L V Content Package K L V Content Package Content Package Content Package Edit Unit #0 Edit Unit #1 Edit Unit #(n-1) Frame #1 Frame #2 Frame #3 Frame #4 Frame #(2n-1) Frame #2nFigure 2 Stereoscopic Picture Trac
26、k File Body Notes: 1 The relationship between Edit Units and Sample Rate is defined in SMPTE 377M and can be summarized as follows: Sample Rate is used in descriptors and defines the gross picture rate. This is typically either the rate of fields or frames in the picture. Edit Rate is the desired ed
27、iting rate of the picture data. An edit unit (1/edit rate) is typically 1 picture, but may be larger in some applications. 2 Given a gross picture rate of 48, the Sample Rate property of the Picture Essence Descriptor would be set to 48 as one sample unit corresponds to one frame in this design, the
28、 Sample Rate is the Frame Rate. Since the left/right pictures are grouped as pairs, the Edit Rate in the Picture Track of the MXF header Packages will be half the Sample Rate: 24. In this example, the MXF file will contain the following information: Sample Rate (Frame Rate) = 48 Edit Rate = 24 3 The
29、 indexing of left/right frames pairs permits decoders to unambiguously determine the first frame of a stereoscopic frames pair at any point in the essence container. 6 MainStereoscopicPicture Element In order to reference the Stereoscopic Picture Track File in a standard Composition Playlist, a Main
30、StereoscopicPicture element is defined and shall be used as an extension element in the Reel element of a Composition Playlist as specified in SMPTE 429-7, Section 7.3.5. The MainStereoscopicPicture element shall indicate stereoscopic picture essence to be projected onto the main screen and shall re
31、ference an external Track File as defined in Section 5. The MainStereoscopicPicture element shall be an instance of PictureTrackFileAssetType and its structure is defined in SMPTE 429-7, Section 8.4. The MainStereoscopicPicture element structure defined in this standard is represented using the Exte
32、nsible Markup Language (XML) XML 1.0, and specified using XML Schema XML Schema Part 1: Structures and XML Schema Part 2: Datatypes. This MainStereoscopicPicture element specification shall be associated with a unique XML namespace name that shall be the string value “http:/www.smpte-ra.org/schemas/
33、429-10/2008/Main-Stereo-Picture-CPL”. This namespace name conveys both structural and semantic version information, and serves the purpose of a traditional version number field. XML namespace names used in this standard are identified in Table 1. Namespace names are represented as Uniform Resource I
34、dentifier (URI) values RFC 23961. 1Readers unfamiliar with URI values as XML namespace names should be aware that although a URI value begins with a “method” element (“http” in this case), the value is designed primarily to be a unique string and does not necessarily correspond to an actual on-line
35、resource. Applications implementing this standard should not attempt to resolve URI values on-line. SMPTE 429-10-2008 Page 6 of 10 pages Table 1 XML Namespaces Qualifier URI msp-cpl http:/www.smpte-ra.org/schemas/429-10/2008/Main-Stereo-Picture-CPL cpl http:/www.smpte-ra.org/schemas/429-7/2006/CPL x
36、s http:/www.w3.org/2001/XMLSchema URIs listed in Table 1 are normative, whereas the namespace qualifier values themselves (used in Table 1 and elsewhere in this standard) are not normative. Thus, namespace qualifier values may be replaced in instance documents by any arbitrary XML compliant namespac
37、e qualifier, meaning that conformant implementations shall expect any XML compliant namespace qualifier value that is associated with a URI from Table 1. 7 Composition Playlist Constraints 7.1 CPL Reels If present in a Composition Playlist, the MainStereoscopicPicture element shall indicate the exis
38、tence of stereoscopic content as specified in this document and the optional MainPicture element shall be omitted. Note: The MainStereoscopicPicture element avoids erroneous 2D playback of a Stereoscopic Picture Track File. 7.2 MainStereoscopicPicture Assets 7.2.1 Edit Rate The Edit Rate of each Mai
39、nStereoscopicPicture asset in the CPL shall match the Edit Rate of the underlying Stereoscopic Picture Track File. 7.2.2 Frame Rate The Frame Rate of each MainStereoscopicPicture asset in the CPL shall match the Sample Rate of the underlying Stereoscopic Picture Track File per SMPTE 429-7, Section 8
40、.4.1. Note: As highlighted in Section 5, the Frame Rate of a Stereoscopic Picture Track File is provided by the Picture Essence Descriptor Sample Rate property. 8 Schema The XML schema of the MainStereoscopicPicture element is provided below: In case of conflict between the prose and the schema, the
41、 prose shall be the authoritative expression of the MainStereoscopicPicture element definition. SMPTE 429-10-2008 Page 7 of 10 pages 9 Sample (Informative) A CPL Reel sample is provided below in order to illustrate such CPL implementation: urn:uuid:4e2606b0-b4ae-6447-a90e-1e5bf99d7f54 Reel #1 of The
42、 Stereoscopic Feature urn:uuid:7af1dace-936d-d74c-a7a5-569abd492e12 Soundtrack for Reel #1 of The Stereoscopic Feature 24 1 3600 urn:uuid:6716450c-7e93-3549-806f-e18d5f4206cd en-us urn:uuid:7e427ee5-434a-c142-b845-6aa67e1e97ff Stereoscopic Picture for Reel #1 of The Stereoscopic Feature 24 1 3800 10
43、0 3600 urn:uuid:1f894844-e1d8-8643-a48d-341b96659499 48 1 185 100 SMPTE 429-10-2008 Page 8 of 10 pages Annex A (Normative) Stereoscopic Picture Sub-Descriptor The Stereoscopic Picture Sub-Descriptor is a supplementary Essence Descriptor that can be strongly referenced by any Picture Essence Descript
44、or. In order that the strong reference can be made, the MXF Generic Descriptor (as defined in SMPTE 377M) has an additional optional property as defined in Table A.1. The Local Tag value associated with this additional optional property (called “Sub Descriptors”) shall be dynamically allocated (dyna
45、mic) as defined in SMPTE 377M. The translation from each dynamically allocated Local Tag value to its full UL value can be found using the Primer Pack mechanism defined in SMPTE 377M. The full 16-byte UL value is defined in SMPTE RP 210. Table A.1 Additional Optional Property for the MXF Generic Des
46、criptor Item Name Type Len Local Tag Item Designator Req ? Meaning DefaultAll elements from the Generic Descriptor defined in SMPTE 377M, Table 17 Sub Descriptors Array of StrongRef (Sub Descriptors) 8+ 16n dynamic 06.01.01.04.06.10.00.00 Opt Array of strong references to Sub Descriptor Sets Any Pic
47、ture Essence Descriptor used to describe stereoscopic picture essence wrapped according to this standard shall have a strong reference to a Stereoscopic Picture Sub-Descriptor, defined in Table A.2 below. As the purpose of this Sub-Descriptor is only to identify a Track File as being a Stereoscopic
48、Picture Track File belonging to this standard, it does not require any specific property. Table A.2 Stereoscopic Picture Sub-Descriptor Item Name Type Len Local Tag UL Designator Req ? Meaning Default Stereoscopic Picture Sub-Descriptor Set Key 16 See Table A.3 below Req Defines the Stereoscopic Pic
49、ture Sub-Descriptor Set Length BER Length var Req Set length see statement below Table A.2 Instance UID UUID 16 3C.0A 01.01.15.02. 00.00.00.00 Req Unique ID of this instance SMPTE RP 210 The ISO/IEC 11578 (Annex A) 16 byte Globally Unique Identifier Generation UID UUID 16 01.02 05.20.07.01. 08.00.00.00 Opt Generation Identifier SMPTE RP 210 Specifies the reference to an overall modification The Stereoscopic Picture Sub-Descriptor Set length should be BER long-form enc
