1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS ISO/IEC 14478-2:1998 C
2、orrected and reprinted 2000-09-15 ICS 33.160.60; 35.140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Information technology Computer graphics and image processing Presentation Environment for Multimedia Objects (PREMO) Part 2: Foundation ComponentThis British Standard, havi
3、ng been prepared under the direction of the DISC Board, was published under the authority of the Standards Committee and comes into effect on 15 January 2001 BSI 01-2001 ISBN 0 580 36967 6 BS ISO/IEC 14478-2:1998 Amendments issued since publication Amd. No. Date Comments National foreword This Briti
4、sh Standard reproduces verbatim ISO/IEC 14478-2:1998 (Version 2) and implements it as the UK national standard. It supersedes BS ISO/IEC 14478-2:1998 (Version 1) which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/31, Computer Graphics and Image Proce
5、ssing, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and prom
6、ulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the s
7、ection entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicati
8、on. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO/IEC title page, pages ii to vii, a blank page, pages 1 to 71 and a back cover. The BSI copyright notice displayed i
9、n this document indicates when the document was last issued.Reference number ISO/IEC 14478-2:1998(E) INTERNATIONAL STANDARD ISO/IEC 14478-2 First edition 1998-12-15 Corrected and reprinted 2000-09-15 Information technology Computer graphics and image processing Presentation Environment for Multimedi
10、a Objects (PREMO) Part 2: Foundation Component Technologies de linformation Infographie et traitement dimages Environnement de prsentation dobjects multimdia (PREMO) Partie 2: Composant fondamentalISO/IEC14478-2:1998(E) ii ISO/IEC 14478-2:1998(E) iii Contents Foreword. . . . . . . . . . . . . . . .
11、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii 1 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、 . . . . . . . . . . . . . 1 2 Normative references. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3.1 PREMO Part 1 definitions .
13、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3.2 Additional definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 Symbols and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5 C
14、onformance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 Foundation non-object types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7 Foundation object types . . . . . . . . . . . . . . . . . . . . . . .
15、. . . . . . . . . . . . . . . . . . . . 5 7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7.2 PREMO objects and fundamental object behaviour . . . . . . . . . . . . . . . . . 5 7.2.1 Creation and destruction of objects. . . . . . . .
16、 . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7.2.2 Inquiries on types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7.3 Simple PREMO objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.3.1 Structures .
17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.4 Callback objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.5 Enhanced PREMO Objects . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . . . . . . . 7 7.5.1 Object properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7ISO/IEC 14478-2:1998(E) iv 7.6 Controller objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.7 Event handler obj
19、ects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.7.1 Basic Event Handler objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.7.2 Synchronization Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . 11 7.8 Time objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.8.1 Clock object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.8.2 System clock object . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.8.3 Timer object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.9 Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.
22、9.1 Event Synchronizable objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.9.2 Time synchronizable objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.9.3 Time slave objects . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . 17 7.9.4 Time line objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8 Enhanced property management and factories. . . . . . . . . . . . . . . . . . . . . . . 19 8.1 Enhanced Property management . . . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . . 19 8.1.1 Motivation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8.1.2 Capabilities and native property values: the PropertyInquiry type . . . . . . . . 20 8.1.3 Property constraint and selec
25、tion: the PropertyConstraint type. . . . . . . . . . . 21 8.2 Creating PREMO objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8.2.1 Generic Factory objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 9 Functional specificatio
26、n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9.2 Common nonobject data types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
27、9.3 Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 9.4 PREMOObject and fundamental object behaviour. . . . . . . . . . . . . . . . . 30 9.5 Simple PREMO object and structures. . . . . . . . . . . . . . . . . . . . . . . . . . . 31 9.5.1 S
28、implePREMOObject. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 9.5.2 Event structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 9.5.3 Constraint structure. . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . . . . . . . . . 31 9.5.4 Action Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 9.5.5 Synchronization Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 9.6 Callback objects .
30、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 9.7 Enhanced PREMO object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 9.8 Controller object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
31、9.9 EventHandler objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 9.9.1 Basic event handler objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 9.9.2 SynchronizationPoint object. . . . . . . . . . . . . . . . . . . . . . . .
32、. . . . . . . . . . . . . . 41 9.9.3 ANDSynchronizationPoint object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 9.10 Timing objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 9.10.1 Clock object . . . . . . . . . . . . . . .
33、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 9.10.2 SysClock object. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 9.10.3 Timer object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34、 . . . . . . . 46 9.11 Synchronization objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 9.11.1 Synchronizable object. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 9.11.2 TimeSynchronizable object. . . . . . . . . . . . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . 53 9.11.3 TimeLine object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 9.11.4 TimeSlave object. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 9.12 E
36、nhanced Property management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.12.1 PropertyInquiry object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 9.12.2 PropertyConstraint object . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37、 . . . . . . . . . . 60 9.13 Creating PREMO objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 9.13.1 GenericFactory object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 9.13.2 FactoryFinder object . . . . . . . . . . . . . . .
38、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 10 Component specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 A Overview of PREMO Foundation Object Types. . . . . . . . . . . . . . . . . . . . . . 66 ISO/IEC 14478-2:1998(E) v B Extensibil
39、ity for PREMO objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 C An example for eventbased synchronization. . . . . . . . . . . . . . . . . . . . . . . . .71ISO/IEC 14478-2:1998(E) vi Foreword ISO (the International Organization for Standardization) and IEC (the Intern
40、ational Electrotechnical Commission) form the specialized system for worldwide standardi- zation. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular f
41、ields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. International Standards are drafted in accordance with the rules give
42、n in the ISO/IEC Directives, Part 3. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International S
43、tandard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO/IEC 14478 may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights
44、. International Standard ISO/IEC 14478-2 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 24, Computer graphics and image processing. ISO/IEC 14478 consists of the following parts, under the general title Information technology Computer graphics and im
45、age processing Presentation Environment for Multimedia Objects (PREMO): Part 1: Fundamentals of PREMO Part 2: Foundation Component Part 3: Multimedia Systems Services Part 4: Modelling, rendering and interaction component Annexes A and B form a normative part of this part of ISO/IEC 14478. Annex C i
46、s for information only. ISO/IEC 14478-2:1998(E) vii Introduction This part of ISO/IEC 14478 defines those object types and nonobject types which be- long to the Foundation Component. Any conforming PREMO implementation shall support these object types. The description of object types categories are
47、given first and then the foundation object types in each category are described.1 INTERNATIONAL STANDARD ISO/IEC 14478-2:1998(E) Information technology Computer graphics and image processing Presentation Environment for Multimedia Objects (PREMO) Part 2: Foundation Component 1 Scope This part of ISO
48、/IEC 14478 lists an initial set of object types and nonobject types useful for the construction of, presentation of, and interaction with multimedia information. This part is dependent on the PREMO object model defined in clause8 of ISO/IEC 14478-1. The foundation component does not depend on any ot
49、her components. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO/IEC 14478. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agree- ments based on this part of ISO/IEC 14478 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO/
