ISO 26429-9:2009
(Main)Digital cinema (D-cinema) packaging — Part 9: Asset mapping and file segmentation
Digital cinema (D-cinema) packaging — Part 9: Asset mapping and file segmentation
ISO 26429-9:2009 specifies a generic method for mapping a D-Cinema Package (DCP) onto one or more file storage volumes. Data structures are specified which provide for the mapping of D-cinema asset identifier values onto paths within a particular file storage scheme (e.g. filesystem paths). Where required, assets may be split across multiple storage volumes to allow efficient use of media and the mapping of assets larger than a given storage volume's capacity. The Asset Map and Volume Index structures and the associated provisions detailed in ISO 26429-9:2009 are intended to provide a framework for simplified mapping of a DCP onto a wide variety of file storage systems.
Emballage du cinéma numérique (cinéma D) — Partie 9: Cartographie d'avoir et segmentation de fichier
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 26429-9
First edition
2009-12-15
Digital cinema (D-cinema) packaging —
Part 9:
Asset mapping and file segmentation
Emballage du cinéma numérique (cinéma D) —
Partie 9: Cartographie d'avoir et segmentation de fichier
Reference number
ISO 26429-9:2009(E)
©
ISO 2009
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ISO 26429-9:2009(E)
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ISO 26429-9:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 26429-9 was prepared by Technical Committee ISO/TC 36, Cinematography.
ISO 26429-9 was prepared by the Society of Motion Picture and Television Engineers (as
SMPTE 429-9-2007) and was adopted, under a special “fast-track procedure”, by Technical Committee
ISO/TC 36, Cinematography, in parallel with its approval by the ISO member bodies.
ISO 26429 consists of the following parts, under the general title Digital cinema (D-cinema) packaging:
⎯ Part 3: Sound and picture track file [equivalent to SMPTE 429-3]
⎯ Part 4: MXF JPEG 2000 application [equivalent to SMPTE 429-4]
⎯ Part 6: MXF track file essence encryption [equivalent to SMPTE 429-6]
⎯ Part 7: Composition playlist [equivalent to SMPTE 429-7]
⎯ Part 8: Packing list [equivalent to SMPTE 429-8]
⎯ Part 9: Asset mapping and file segmentation [equivalent to SMPTE 429-9]
⎯ Part 10: Stereoscopic picture track file [equivalent to SMPTE 429-10]
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ISO 26429-9:2009(E)
Introduction
This part of ISO 26429 comprises SMPTE 429-9-2007 and Annex ZZ (which provides equivalences between
ISO standards and SMPTE standards referenced in the text).
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ISO 26429-9:2009(E)
SMPTE 429-9-2007
SMPTE STANDARD
D-Cinema Packaging —
Asset Mapping and
File Segmentation
Page 1 of 18 pages
Table of Contents Page
Foreword . 2
1 Scope . 3
2 Conformance Notation . 3
3 Normative References . 3
4 Overview . 4
4.1 Ingesting a DCP Volume (Informative) . 5
4.2 XML File Structure . 5
5 AssetMap Structure. 6
5.1 Id . 6
5.2 AnnotationText [optional] . 6
5.3 Creator . 7
5.4 VolumeCount . 7
5.5 IssueDate . 7
5.6 Issuer . 7
5.7 AssetList. 7
6 Asset Structure. 7
6.1 Id . 7
6.2 AnnotationText [optional] . 8
6.3 PackingList [optional] . 8
6.4 ChunkList . 8
7 Chunk Structure . 8
7.1 Path. 8
7.2 VolumeIndex [optional] . 8
7.3 Offsest [optional] . 9
7.4 Length [optional]. 9
8 VolumeIndex Structure. 9
9 Media-Specific Constraints . 9
9.1 Volume Definition. 9
9.2 URL Scheme. 9
Copyright © 2007 by THE SOCIETY OF
Approved
MOTION PICTURE AND TELEVISION ENGINEERS
3 Barker Avenue, White Plains, NY 10601
June 25, 2007
(914) 761-1100
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ISO 26429-9:2009(E)
SMPTE 429-9-2007
9.3 URL Path . 9
9.4 XML Encoding . 10
9.5 Asset Map Location . 10
9.6 VolumeIndex Location . 10
9.7 Chunk Size . 10
10 Asset Map Sample (Informative) . 11
11 Volume Index Sample (Informative) . 11
12 XML Schema . 12
Annex A Basic Map Profile (Normative) . 14
A.1 URL Scheme. 14
A.2 URL Path. 14
A.3 XML Encoding. 14
A.4 Asset Map Location. 14
A.5 VolumeIndex Location. 14
A.6 Chunk Size. 14
Annex B XML Diagram Legend (Informative). 15
B.1 Element Symbols . 15
B.1.1 Examples . 15
B.2 Model Symbols ("Compositors") . 16
B.3 Types. 16
B.4 Model Groups and References . 17
Annex C Bibliography (Informative). 18
Foreword
SMPTE (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. SMPTE’s Engineering Documents, including Standards,
Recommended Practices and Engineering Guidelines, are prepared by SMPTE’s 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 Engineering Documents are drafted in accordance with the rules given in Part XIII of its
Administrative Practices.
SMPTE 429-9 was prepared by Technology Committee DC28.
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ISO 26429-9:2009(E)
SMPTE 429-9-2007
1 Scope
This document specifies a generic method for mapping a D-Cinema Package (DCP) onto one or more file
storage volumes. Data structures are specified which provide for the mapping of D-Cinema asset identifier
values onto paths within a particular file storage scheme (e.g., filesystem paths). Where required, assets may
be split across multiple storage volumes to allow efficient use of media and the mapping of assets larger than
a given storage volume’s capacity. The Asset Map and Volume Index structures and the associated
provisions detailed herein are intended to provide a framework for simplified mapping of a DCP onto a wide
variety of file storage systems.
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 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 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 "should 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 deprecated
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 “reserved” and in addition indicates that the provision
will never be defined in the future.
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 standard are encouraged to investigate the possibility of applying the
most recent edition of the standards indicated below.
1. World Wide Web Consortium (W3C) (2004, February 4). Extensible Markup Language (XML) 1.0 (Third
Edition).
2. World Wide Web Consortium (W3C) (2004, October 28). XML Schema Part 1: Structures (Second Edition).
3. World Wide Web Consortium (W3C) (2004, October 28). XML Schema Part 2: Datatypes (Second Edition).
4. Internet Engineering Task Force (IETF) (November 1996) RFC1738 — Uniform Resource Locators (URL)
5. Internet Engineering Task Force (IETF) (1996, November). RFC 2396 — Uniform Resource Identifiers
(URI): Generic Syntax
6. Internet Engineering Task Force (IETF) (2005, July). RFC 4122 — A Universally Unique Identifier (UUID)
URN Namespace.
7. SMPTE 429-8-2007, D-Cinema Packaging — Packing List
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ISO 26429-9:2009(E)
SMPTE 429-9-2007
4 Overview
D-Cinema content is composed of a number of distinct assets such as Composition Playlists and Track Files.
For delivery between systems, these assets are combined into logical D-Cinema Packages (DCP). A DCP is
a single delivery unit defined by a Packing List document [SMPTE 429-8]. The Packing List enumerates all
the assets included in the DCP, and provides information necessary for a traceable and error-free delivery.
The DCP and its Packing List are specified independently of any media or file storage scheme. The Packing
List contains the UUID identifiers of the assets in the package, not the location of those assets on some
volume of media. The Asset Map provides the link between the asset identifier UUIDs and the files containing
the assets. This layered approach has two distinct advantages. First, it simplifies specification of the Packing
List by removing dependence on past, current or future media formats and constraints. Second, it allows the
DCP and its underlying assets to be created once and mapped onto various target media as circumstances
require.
The Asset Map structure, depicted in Figure 1 below, provides a mapping from the Packing List asset Ids to
actual file locations within the file storage scheme. An Asset Map may contain mappings for more than one
DCP, but shall not contain a partial mapping for a particular DCP. A DCP shall not span multiple Asset Maps.
The Asset Map provides special identification for Packing List assets so that they may be located without
scanning the entire volume.
A DCP storage volume (a distinct container of files) shall contain exactly one Asset Map. In a multi-volume
mapping, a single Asset Map shall contain the complete mapping for all volumes, and shall be repeated on
each volume. A Volume Index structure (defined in Section 8 below) shall be used to identify each volume in
a multi-volume set.
Assets may be divided into multiple segments to allow spanning across multiple volumes (segmentation).
The segments are called “chunks”, and are stored in files, without additional structure. An Asset may be
recreated by concatenating the constituent chunk files.
Figure 1 – Relationship between the Packing List and Asset Map structures
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ISO 26429-9:2009(E)
SMPTE 429-9-2007
The definition of “volume” and the means of identifying the Asset Map on a volume shall be defined by a
normative DCP Map Profile (see Section 9 “Media-Specific Constraints” below) for that media type. DCP Map
Profiles shall normatively reference this document and shall follow the provisions of this document except
where explicitly noted.
4.1 Ingesting a DCP Volume (Informative)
The process of reading a DCP into a D-Cinema system is termed Ingest. A system may provide a simple or
elaborate ingest control interface - allowing coarse or fine-grained selection of items to be ingested — but the
basic process of discovering the contents of a volume will always be the same.
As illustrated using pseudo-code in Figure 2 below, a DCP storage volume is ingested by first opening the
Asset Map document on that volume. The means of identifying the Asset Map on the volume is defined by the
normative DCP Map Profile (see Section 9) for that media type. The Asset Map is used to locate the Packing
List(s) which detail the contents of the available DCP(s). Assets are chosen from the Packing List(s), and the
selected assets are ingested by using the Asset Map to locate the chunks of data on the storage volume. The
chunks are concatenated to restore the original file. (This example does not illustrate multi-volume ingest).
Ingest DCP volume:
open the Asset Map
for each Packing List in the Asset Map
open the Packing List
for each Asset in the Packing List
if this Asset is wanted
locate the corresponding Asset structure in the Asset Map
for each chunk in the Asset structure
read the chunk data
write to destination
test the message digest
Figure 2 – Example ingest process
4.2 XML File Structure
The structures defined in this document are represented using the Extensible Markup Language (XML) [XML
1.0], and specified using XML Schema [XML Schema Part 1: Structures] and [XML Schema Part 2:
Datatypes]. This specification shall be associated with a unique XML namespace name [Namespaces in
XML]. The namespace name shall be the string value “http://www.smpte-ra.org/schemas/429-
9/2007/AM”. This namespace name conveys both structural and semantic version information, but does not
serve the purpose of a traditional version number field.
Table 1 lists the XML namespace names used in this specification. Namespace names are represented as
1
Uniform Resource Identifier (URI) values [RFC 2396] .
1
Readers 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 resource. Applications implementing this standard
should not attempt to resolve URI values on-line.
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ISO 26429-9:2009(E)
SMPTE 429-9-2007
Table 1 – XML Namespaces
Qualifier URI
http://www.smpte-ra.org/schemas/429-9/2007/AM
am
xs http://www.w3.org/2001/XMLSchema
The URIs found in Table 1 are normative. The namespace qualifier values (also called namespace prefixes in
XML jargon) used in Table 1 and elsewhere in this document, namely "am" and "xs", are not normative.
Specifically, they may be replaced in instance documents by any XML compliant namespace prefix. In other
words, implementations shall expect any arbitrary XML compliant namespace prefix value that is associated
with a URI from table 1.
5 AssetMap Structure
The AssetMap element is the top-level element of an Asset Map XML document. A single Asset Map
document shall be present in a file on each DCP storage volume. The elements and structure of an AssetMap
element are illustrated in Figure 3 and defined in the subsections that follow.
Figure 3 – AssetMap structure
5.1 Id
The Id element uniquely identifies the Asset Map structure. It is encoded as a urn:UUID [RFC 4122].
5.2 AnnotationText [optional]
The AnnotationText element is a free-form, human-readable annotation describing the Asset Map. It is
meant strictly as a display hint to the user. The optional language attribute is an xs:language language
code and indicates the language used. If the language attribute is not present, the default value en shall be used.
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5.3 Creator
The Creator element is a free-form, human-readable annotation describing the system (hardware/software)
that was used to create the Asset Map for distribution. It is meant strictly as a display hint to the user. The
optional language attribute is an xs:language language code and indicates the language used. If the
language attribute is not present, the default value en shall be used.
5.4 VolumeCount
The VolumeCount element indicates the total number of volumes that are referenced by this Asset Map. The
first volume in a set shall be numbered 1 (one).
5.5 IssueDate
The IssueDate element indicates the time and date at which the Asset Map was issued. It may be displayed
to the user.
5.6 Issuer
The Issuer element is a free-form, human-readable annotation describing the person or company who has
created the Asset Map for distribution. It is meant strictly as a display hint to the user. The optional language
attribute is an xs:language language code and indicates the language used. If the language attribute is
not present, the default value en shall be used.
5.7 AssetList
The AssetList element contains a list of Asset elements. The structure of the Asset element is described
in the following section.
6 Asset Structure
The Asset element is used to represent assets within the AssetList element of an AssetMap. The Asset
element is of the type AssetType, illustrated in Figure 4 and defined in the subsections that follow.
Figure 4 – Asset structure
6.1 Id
The Id element uniquely identifies the asset for management purposes. It is encoded as a urn:UUID [RFC
4122].
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ISO 26429-9:2009(E)
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6.2 AnnotationText [optional]
The AnnotationText element is a free-form, human-readable annotation describing the asset. It is meant
strictly as a display hint to the user. The optional language attribute is an xs:language language code and
indicates the language used. If the language attribute is not present, the default value en shall be used.
6.3 PackingList [optional]
The PackingList element indicates whether the asset is a Packing List [SMPTE 429-8]. It is encoded as an
xs:boolean. If the asset is a Packing List, the element shall be present and the value shall be true. The
default value is false.
6.4 ChunkList
The ChunkList element contains an ordered list of asset Chunk elements. The structure of the Chunk
element is described in the following section.
7 Chunk Structure
The Chunk element is used to represent chunks within the ChunkList element of an Asset. The Chunk
element is of the type ChunkType, illustrated in Figure 5 and defined in the subsections that follow.
Figure 5 – Chunk structure
7.1 Path
The Path element indicates the complete path for the chunk, represented as a URL per [RFC 1738]. Its
semantics and format are delivery-medium dependent. The value is encoded as an xs:anyURI. The
scheme segment of the URL shall be defined by the defining DCP Map Profile.
NOTE – Annex A presents a basic Map Profile.
7.2 VolumeIndex [optional]
The VolumeIndex element indicates the index of the volume that contains the chunk. The first volume shall
be Volume 1. If the VolumeIndex parameter is absent, the chunk shall belong to volume 1.
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ISO 26429-9:2009(E)
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7.3 Offset [optional]
The Offset element indicates the offset from the start of the asset to the first byte of the asset segment
referenced by this chunk. If the Offset parameter is absent, the chunk is assumed to start at the beginning
of the asset.
7.4 Length [optional]
The Length element identifies the length, in bytes, of the chunk. If the Length parameter is absent, the
length of the chunk shall be that of the asset as expressed by the respective Packing List.
8 VolumeIndex Structure
The VolumeIndex element is the top-level element of a Volume Index XML document. A single Volume
Index document shall be present in a file on each DCP storage volume. The Volume Index is optional for a
single volume DCP.
The VolumeIndex element encodes the numerical index of a particular volume in a DCP set. The element
has a single child element, Index, which encodes the volume index number as an xs:positiveInteger
value. An example is given in Section 9 below.
9 Media-Specific Constraints
The structures defined above do not alone provide sufficient specification for mapping a DCP onto a file
storage system. Many details must be defined to form a complete, standardized mapping, including the format
and access method of the storage system and the paths of the Asset Map and Volume Index files on an
instance of that system.
A DCP Map Profile document specifies, or references specifications of, a file storage system and the
electronic and/or logical means of retrieving files from it. A DCP Map Profile specifies the manner by which a
DCP shall be retrieved from the specified file storage system, including any necessary constraints on the use
of the file storage system and the structures in this document. A DCP Map Profile is distinguished from other
file storage specifications by its normative reference to this document and its adherence to the provisions of
the following sub-sections.
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