CAN CSA-ISO IEC 13522-1-2000 Information technology - Coding of multimedia and hypermedia information - Part 1 MHEG object representation - Base notation (ASN 1).pdf

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1、National Standard of Canada CAN/CSA=ISO/ZEC 13522-1 -00 (ISO/IEC 13522-1 1997) CSA INTERNATIONAL /- International Standard ISO/IEC 13522-1:1997 (first edition 1997-05-15) has been adopted without modification as CSA Standard CAN/CSA-ISO/IEC 13522-1-00, which has been approved as a National Standard

2、of Canada by the Standards Council of Canada. ISBN 1-89441 6-91 -0 March 2000 Information technology - Coding of multimedia and hypermedia information - Part 1: MHEG object representation - Base notat (ASN.1) Technologies de /information - Codage de /information multimedia hypermedia - Partie 7: Rep

3、resentation dobjet MHEG - Notation de base (ASN. 7) (Reaff i r med 2004) OR 2t Reference number ISO/IEC 13522-1 :I 997(E) The Canadian Standards Association, which operates under the name CSA International (CSA), under whose auspices this National Standard has been produced, was chartered in 191 9 a

4、nd accredited by the Standards Council of Canada to the National Standards system in 7973. It is a not-for-profit, nonstatutory, voluntary membership association engaged in standards development and certification activities. and users - including manufacturers, consumers, retailers, unions and profe

5、ssional organizations, and governmental agencies. The standards are used widely by industry and commerce and often adopted by municipal, provincial, and federal governments in their regulations, particularly in the fields of health, safety, building and construction, and the environment. indicate th

6、eir support for CSAs standards development by volunteering their time and skills to CSA Committee work and support-ting the Associations objectives through sustaining memberships. The more than 7000 committee volunteers and the 2000 sustaining memberships together form CSAs total membership from whi

7、ch its Directors are chosen. Sustaining memberships represent a major source of income for CSAs standards develop men t activities. in support of and as an extension to its standards development activities. To ensure the integrity of its certification process, the Association regularly and continual

8、ly audits and inspects products that bear the CSA Mark. Toronto, CSA has regional branch offices in major centres across Canada and inspection and testing agencies in eight countries. Since 191 9, the Association has developed the necessary expertise to meet its corporate mission: CSA is an independ

9、ent service organization whose mission is to provide an open and effective forum for activities facilitating the exchange of goods and services through the use of standards, certification and related services to meet national and in te rna ti on a I needs. For futher information on CSA services, wri

10、te to CSA International 178 Rexdate Boulevard Toronto, Ontario, M9W 1 R3 Canada CSA standards reflect a national consensus of producers Individuals, companies, and associations across Canada The Association offers certification and testing services In addition to its head office and laboratory compl

11、ex in CSA INTERNATIONAL - 1 The Standards Council of Canada is the coordinating body of the National Standards system, a federation of independent, autonomous organizations working towards the further development and improvement of voluntary standardization in the national interest. The principal ob

12、jects of the Council are to foster and promote voluntary standardization as a means of advancing the national economy, benefiting the health, safety, and welfare of the public, assisting and protecting the consumer, facilitating domestic and international trade, and furthering international cooperat

13、ion in the field of standards. has been approved by the Standards Council of Canada and one which reflects a reasonable agreement among the views of a number of capable individuals whose collective interests provide to the greatest practicable extent a balance of representation of producers, users,

14、consumers, and others with relevant interests, as may be appropriate to the subject in hand. It normally is a standard which is capable of making a significant and timely contribution to the national interest. Approval of a standard as a National Standard of Canada indicates that a standard conforms

15、 to the criteria and procedures established by the Standards Council of Canada. Approval does not refer to the technical content of the standard; this remains the continuing responsibility of the accredited standards-development organization. Those who have a need to apply standards are encouraged t

16、o use National Standards of Canada whenever practicable. These standards are subject to periodic review; therefore, users are cautioned to obtain the latest edition from the organization preparing the standard. The responsibility for approving National Standards of Canada rests with the Standards Co

17、uncil of Canada 45 OConnor Street, Suite 1200 Ottawa, Ontario, K1 P 6N7 Canada A National Standard of Canada is a standard which Q Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users to judge its s

18、uitability for their particular purpose. lnformation technology - Coding of multimedia and hypermedia information - Part 7: MHEC object representation - Base notation (ASN. 7) CAN/CSA-lSO/IfC 13522- 7 -00 CAN/CSA-ISO/IEC 13522-1 -00 Information technolow - Coding of multimedia and hypermedia informa

19、tion - Part 1: MHEG object representafion - Base notation (ASN.1) CSA Preface Standards development within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the Canadian A

20、dvisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 on Information Technology (1SO/IEC JTCl) for the Standards Council of Canada (SCC), the IS0 member body for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of the International Telecommunication Union

21、(ITU), Canada participates in the International Telegraph and Telephone Consultative Committee (ITU-T). This International Standard was reviewed by the CSA TCIT under the jurisdiction of the Strategic Steering Committee on tnformation Technology and deemed acceptable for use in Canada. (A committee

22、membership list is available on request from the CSA Project Manager.) From time to time, ISO/IEC may publish addenda, corrigenda, etc. The CSA TClT will review these documents for approval and publication. For a listing, refer to the CSA Information Products catalogue or CSA Info Update or contact

23、a CSA Sales representative. This Standard has been formalIy approved, without modification, by these Committees and has been approved as a National Standard of Canada by the Standards Council of Canada. March 2000 0 CSA International - 2000 All rights reserved. No part of this publication may be rep

24、roduced in any form whatsoever without the prior permission of the publisher. /SO/EC material is reprinted with permissioa Inquiries regarding this National Standard of Canada should be addressed to CSA International, 7 78 Rexdale Boulevard, Toronto, Ontario, M9 W 7 R3. March 2000 CSA/1 1 NTE R N AT

25、 I 0 N AL STANDARD ISO/IEC 13522-1 First edition 1997-05-1 5 Information technology - Coding of multimedia and hypermedia information - Part 1: MHEG object representation - Base notation (ASN.1) Technologies de Iinformatbn - Codage de Iinformation multimedia et hypermedia - Partie 7: Representation

26、dobjet MHEG - Notation de base (ASN. 7) p lh I Reference number ISO/IEC 13522-1 :1997(E lSO/lEC 13522-1 : 1997( E) Contents 0 INTRODUCTION 1 0.2 MultimedialHypermedia application requirements xlii 0.3 Rationale for standardisation of multimedia and hypermedia information xliv 0.4 This part of ISO/IE

27、C 13522 objectives . xlv 0.4.2 Presentation .xlv 0.4.3 Minimal resources Xlv 0.1 Application domains for requirements analysis . xli 0.4.1 Interchange xIV 0.4.4 Real time . xlvi 0.5 Concepts of this part of ISO/IEC 13522 xlvi 0.5.1 Object orientation xlvi 0.5.2 Encoding xlvii 0.5.3 Overview of the M

28、HEG classes . xlviii 0.5.3.1 Content class xlviii 0.5.3.2 Multiplexed content class xlviii 0.5.3.3 Composite class xlviii 0.53.4 Action class . xlviii 0.5.3.5 Elementary actions xlix 0.5.3.6 Get actions xlix 0.5.3.7 Link class xlix 0.5.3.8 Script class . xli: 0.5.3.9 Descriptor class . 0.5.3.1 0 Con

29、tainer class . 0.5.4 Run-time objects (rt-objects) 0.5.5 Channels . 0 ISO/IEC I997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permissio

30、n in writing from the publisher. ISO/IEC Copyright Office Case postale 56 CH-1211 Gentve 20 Switzerland ii 0 ISO/IEC ISOAEC 13522-1 :1997(E) 0.6 The MHEG application interface . i 0.7 Extensibility of this part of ISO/IEC 13522 i 0.8 Liaisons li 1 SCOPE . 1 1.1 Specificity of the scope . 1 1.2 Issue

31、s outside the scope of thjs part of ISOAEC 13522 1 2 CONFORMANCE . 2 2.1 Profiles . 2 2.2 .Syntax 2 2.3 Semantics . 2 3 NORMATIVE REFERENCES . 2 4 DEFINITIONS 3 5 SYMBOLS AND ABBREVIATIONS 10 SECTION 1: OVERVIEW . 13 6 MAIN FEATURES OF THIS PART OF ISOflEC 13522 . 13 6.1 Interchanging multimedia obj

32、ects 13 6.2 The object-oriented approach 13 6.2.1 Object classes 13 6.2.2 Subclasses and inheritance 13 6.2.3 Polymorphism . 13 6.2.4 Objects and object life cycles 13 6.3 Technical features . 14 6.3.1 Object composition for interchange and presentation 14 6.3.2 Run-time objects . 15 6.3.3 Individua

33、l behaviour common to all rt-objects created from a given model object 16 6.3.4 Synchronisation 16 6.3.5 Links . 16 6.3.6 Input . 17 6.3.7 Event handling 17 6.3.8 Anchor 17 6.3.9 Real time 17 6.3.1 0 Object management . 18 6.3.10.1 Object identification 18 6.3.1 0.2 Object reference . 18 6.3.10.3 Ob

34、ject content 18 6.3.1 0.4 Uniform objects 18 . 111 ISOAEC 13522-1 :1997(E) 0 I SO/I EC 6.3.11 Minimal resources . 18 6.3.12 Presentation and structuring dynamism 19 6.3.13 Macro action and link 19 6.3.1 4 Static and dynamic assignment of generic value . 19 7 MHEG ENGINE ASSUMPTIONS. - . 19 7.1 Handl

35、ing and Interchange of objects . 19 7.2 The MHEG application interface 20 7.3 Exception handling 20 8 METHODOLOGY 20 8.1 Modularity . 21 8.2 Methodology of representation of MHEG objects . 21 . 8.2.1 Level A: Description of representation . 22 8.2.2 Level B: Precise object-oriented definition . 22 8

36、.2.3 Level C: Isomorphic notations for the structure of MHEG objects 23 8.2.3.1 ASN.1 techniques used in level C . 23 8.2.3.2 Copyright protection . 25 8.2.4 Level D: Coded representation of MHEG objects 25 SECTION 2: GENERIC UTILITY AND USEFUL DEFINITION MECHANISMS 26 9 PRESENTATION MECHANISM 26 9.

37、1 Presentation space (PS) . 27 9.1 -1 Temporal axis . 27 9.1.2 Spatial axes 28 9.1.3 Audible volume range (AVR) . 29 9.2 Original presentation space (OPS) 30 9.2.1 Initialisation of OS and OD 30 9.2.2 lnitialisation of GF . 30 9.2.3 Initialisation of attributes for rt-components . 31 9.2.4 Initialis

38、ation of attributes for rt-contents . 31 9.3 Channel presentation space (CPS) . 31 9.4 Relative presentation space (RPS) 32 9.5 CPS mapping 33 10 GENERIC IDENTIFICATION MECHANISM . 33 10.1 External identification 34 10.1 . 1 Public identifier . 34 10.1 -2 System identifier . 35 10.2 Internal identif

39、ication . 36 iv 0 ISOAEC ISOAEC 13522-1 :1997(E) 10.2.1 MHEG Identifier 36 10.22 Root Rt ID 37 10.2.3 Channel identifier 37 10.2.4 Composition element index . 37 10.2.5 Container element identification 38 10.2.6 Socket identifier 39 10.2.7 Stream identifier . 40 10.3 Symbolic identification . 40 11

40、GENERIC REFERENCE MECHANISM 41 11.1 Generic reference using generic identification . 41 1 1.3 ? reference 44 12 GENERIC VALUE 46 11.2 Predefined references . 43 12.1 Generic boolean 47 12.2 Generic numeric 47 12.3 Generic integer . 47 12.4 Generic ratio . 47 12.5 Generic string . 47 12.6 Generic ref

41、erence . 48 12.7 Generic list 48 13 MACRO MECHANISM . 48 14 HOOKS . 50 15 EXTENSIBILITY . 51 15.1 Catalogues 51 15.2 Incorporation of New MHEG object classes . 52 15.3 Provision for extensibility . 52 SECTION 3: OVERVIEW OF MHEG CLASSES 54 16 MHEG OBJECT CLASSES OVERVIEW . 53 17 STRUCTURE OF MH-OBJE

42、CT CLASS 53 17.1 Class identification 53 17.2 MHEG ID 54 17.3 General object information 54 18 STRUCTURE OF ACTION CLASS . 54 18.1 Elementary actions 55 18.2 Basic action object 55 18.3 Nested action object 56 18.4 Macro action object . 56 V ISOhEC 13522-1 : 1997(E) 0 ISO/IEC 19 STRUCTURE OF LINK CL

43、ASS 56 19.1 Link Condition . 57 19.1.1 Trigger condition . 58 19.1.2 Constraint condition 59 19.1.3 Source value 60 19.1.4 Comparison value . 60 19.1.5 Previous condition 60 19.1.6 Current condition 61 19.1.7 Comparison operator 61 19.1.8 Logical combination 64 19.1.9 Logical operator 65 19.2 Link E

44、ffect . 66 19.3 Basic link object 66 19.4 Nested link object 66 19.5 Macro link object . 67 20 STRUCTURE OF MODEL CLASS . . 67 21 STRUCTURE OF SCRIfT CLASS 67 22 STRUCTURE OF COMPONENT CLASS . 68 23 STRUCTURE OF CONTENT CLASS . 68 24 STRUCTURE OF MUL“LEXED CONTENT CLASS 69 25 STRUCTURE OF COMPOSIIX

45、CLASS 69 25.2 Availability Close-down 71 25.4 Rt-Availability Close-down . 72 25.6 Composition example 73 . 25.1 Availability Start-up . 71 .f 25.3 Rt-Availability Start-up . 72 25.5 Composition Element 72 26 STRUCTURE OF CONTAINER CLASS . 73 26.1 Container Start-up . 73 26.2 Container Close-down 74

46、 26.3 Container Element . 74 27.1 Related Object 75 27.1.1 Script Class Information 75 27 STRUCTURE OF DESCRIPTOR CLASS . 74 27.1 -2 Content Class Information 76 27.1.3 Mux Content Class Info 76 27.1 -4 Alternative Object . 76 vi c 0 ISO/IEC ISOAEC 13522-1 :1997(E) 27.1.5 Offset . 76 27.2 Other Desc

47、riptor 77 27.3 Readme 77 27.4 System Readable Material 77 27.5 Channel Information 77 27.6 Catalogued Style Information 78 27.7 Cat Ext elementary action Info 78 27.8 Cat Ext Attribute Info . 78 SECTION 4: COMMON BEHAVIOUR OF MHEG ENTITIES . 82 28 MEEG ENTITY BEHAVIOUR . 79 29 MHEG ENTITY STATE DEFI

48、NITION 79 29.1 MHEG object availability . 80 29.2 Link activation . 81 29.3 Channel availability . 82 29.4 Rt-object availability 83 29.5 Rt-Component running behaviour 84 29.6 Rt-Component presentation behaviour 85 30 LIFE CYCLE OF MHEG ENTITIES 89 31 GENERAL ACTION MECHANISMS . 89 31 . 1 Action ha

49、ndling . 89 31.2 Processing of link effect 90 31.2.1 Serial action processing 90 31 -2.2 Parallel action processing . 91 31.3 Basic processing of an elementary action 92 31.5 Arithmetic precision . 93 32 COMMON ACTION EFFECTS AND ELANDLING 93 32.1 Elementary actions 93 32.2 Get actions . 94 32.3 Recommended exception handling 94 33 POSTPONE BEHAVIOUR 95 33.1 Behaviour attributes and statuses . 95 33.2 Actions to change the behaviour . 95 33.2.1 Delay action 95 33.2.1 -1 Delay action effect 95 33.2.1.2 Delay additional error conditions . 95 31.4 Resolution of target