ISO/IEC INTERNATIONAL STANDARD 13522-3 First edition 1997-05-15 Information technology Coding of multimedia and hypermedia information - Part 3: MHEG script interchange representation Technologies de I'information - Codage de I'information multimedia et hypermédia- Partie 3:Représentation d'interéchange script MHEG IEC fso Reference number ISO/IEC13522-3:1997(E) Copyright Intermational Organization for Standardization rmitted without license from IHS Not for Resale ISO/IEC 13522-3:1997(E) Contents 1 Scope ... 1.1 Context of the scope 1.2 Scope of this part of iSO/IEC 13522 2 Normative references... 3 Definitions. 2 4 Abbreviations 5 Conformance 5.1 Information object conformance 5.1.1 Profiles.... 5.1.2 Encoding... 5.1.3 Syntax 5.1.4 Semantics... 5.2 Implementation conformance. 5.2.1 Conformance requirements .... 5.2.2 Conformance documentation.. 5.3 Application conformance 5.4 TestMethods 6 Overview 6.1 Description methodology 6.2 Data processing operations 10 6.3 Access to external data and functions 7 MHEG/MHEG-3relationship 7.1 MHEG entities. .11 7.2 Functional entities 11 7.3 MHEG-SIR script interpreter... 8 Elements of MHEG-SIR .. 8.1 Data types.... 8.1.1 Predefined types....... 8.1.1.1 Primitive types 8.1.1.1.1 void type .14 8.1.1.1.2 octet type 8.1.1.1.3 short type .14 8.1.1.1.4 long type 8.1.1.1.5 unsigned short type .14 @ISO/EC 1997 electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office·Case postale 56· CH-1211 Geneve 20·Switzerland Printed in Switzerland ii Copyright Intermational Organization for Standardization Not for Resale @ISO/IEC ISO/IEC13522-3:1997(E) 8.1.1.1.6 unsigned long type 14 8.1.1.1.7 float type 14 8.1.1.1.8 double type.... .14 8.1.1.1.9 boolean type. 14 8.1.1.1.10 character type.. 14 8.1.1.1.11 data identifiertype 8.1.1.1.12 objectreferencetype 15 8.1.1.2 Predefined constructed types. 15 8.1.2 Declared constructed types 15 8.1.2.1 sequence types 15 8.1.2.2 string types.. 16 8.1.2.3 array types.... 16 8.1.2.4 structure types 8.1.2.5 uniontypes 17 8.2 Data 17 8.2.1 Immediate values. 18 8.2.2 Constants. 18 8.2.3 Variables 8.2.3.1 Global variables. 19 8.2.3.2 Local variables .... 19 8.2.3.3 Dynamic variables 19 8.3 Functions..... 19 8.3.1 Routines. .20 8.3.2 Services 20 8.3.3 Predefined functions 21 8.4 Messages . 21 8.4.1 Package exceptions. 21 8.4.2 Predefined messages 22 8.5 Instructions.. 22 8.6 Identifiers. 22 8.6.1 Type identifiers. 22 8.6.2 Data identifiers . 23 8.6.3 Function identifiers 8.6.4 Message identifiers .. .23 9 The MHEG-SIR virtual machine...... .23 9.1 Structure of the MHEG-SIR virtual machine. 24 9.2 Structures and notations. ..24 9.2.1 Table 24 9.2.2 Stack 9.2.3 Parameter stack.. .25 9.2.4 Queue 9.2.5 Data representation .25 9.3 Memory areas... 26 9.3.1 Mh-script memory areas . 9.3.1.1 Data areas .27 9.3.1.1.1 Type definition table 9.3.1.1.2 Constant table 27 9.3.1.1.3 Giobal variable definition table . 9.3.1.2 Code areas... 9.3.1.2.1 Routine definition table ... 27 9.3.1.2.2 Package definition table 9.3.1.2.3 Service definition table .28 9.3.1.2.4 Exception definition table. .28 9.3.1.2.5 Handler definition table. .29 9.3.1.2.6 Program code area..... 29 ii Copyright Intermational Organization for Standardization Not for Resale ISO/EC 13522-3:1997(E) @ISO/EC 9.3.2 Rt-script memory areas.. 29 9.3.2.1 Dynamic memory areas... 29 9.3.2.1.1 Variable table ... 29 9.3.2.1.2 Call stack 30 9.3.2.1.3 Parameter stack.. 9.3.2.1.4 Message queue .. 31 9.3.2.1.5 Heap .31 9.3.2.2 Registers 31 9.3.2.2.1 Instruction pointer register... 9.3.2.2.2 Instruction register. .32 9.3.2.2.3 Error register.... 32 9.3.2.2.4 Stack pointer register.. .32 9.3.2.2.5 Frame pointer register 32 9.3.2.2.6 Queue pointer register .. .32 9.3.2.2.7 Function register. 32 9.4 Script statuses 33 9.4.1 Mh-script statuses . .33 9.4.1.1 Not available .33 9.4.1.2 Available... .33 9.4.2 Rt-script statuses 33 9.4.2.1 Not ready 33 9.4.2.2 Ready 9.4