ISO/IEC 13522-3:1997

ISO/IEC
INTERNATIONAL
13522-3
STANDARD
First edition
1997-05-I 5
Information technology - Coding of
multimedia and hypermedia information -
Part 3:
MHEG script interchange representation
Codage de /‘information multimkdia et
Technologies de /‘information -
hypermedia -
Partie 3: Rep&en ta tion d ‘in terkhange script MHEG
Reference number
ISO/I EC 13522-3: 1997(E)

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ISO/I,EC 13522-3: 1997(E)
Contents
1
1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.
Scope
1
. . . . . . . . . . . . . . . .~.~.
11 . Context of the scope
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.~.~.”.
12 . Scope of this part of ISO/IEC 13522
1
..,..................................................................~..................~....~.......~..,~.............,.
2 Normative references
2
3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.“.
6
4 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .“.“.”.~.~~.~~~~.
7
5 Conformance .
7
..........................................................................................
51 . Information object conformance
7
............................................................................................................
5.1 .I Profiles
7
.........................................................................................................
5.1.2 Encoding
8
.......................................................................................................
5.1.3 Syntax
8
.......................................................................................................
5.1.4 Semantics
8
..............................................................................................
52 . Implementation conformance
8
.............................................................................
Conformance requirements
5.2.1
8
...........................................................................
Conformance documentation
5.2.2
Y
. .*.,.~.~.
5.3 Application conformance
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.~.
54 . Test Methods
9
6 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.”.~~~.~~~.~.~.~.~~~~~
Y
. . . . . . . . . . . . . . . . . . . . . . . . . .“.~.
61 . Description methodology
10
. . . . . . . . . . . . . . . . . . . . . . . . . . . .~.~.
62 . Data processing operations
10
. . . . . . . . . . . . . . . . . . .~.”.~.
63 . Access to external data and functions
11
.............................................................................................................
7 MHEG/MHEG-3 relationship
11
....................................................................................................................
7.1 MHEG entities
11
..............................................................................................................
7.2 Functional entities
12
...............................................................................................
73 . MHEG-SIR script interpreter
12
....................................................................................................................
8 Elements of MHEG-SIR
12
..........................................................................................................................
81 . Data types
13
.............................................................................................
8.1 .l Predefined types
13
Primitive types .
8.1 .l .l
.............................................. 14
8.1.1.1.1 . void type
14
8.1 .l .I .2 octet type .
14
8.1 .1.1.3 short type .
14
long type .
8.1 .1.1.4
14
unsigned short type .
8.1 .1.1.5
0 ISO/IEC 1997
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Printed in Switzerland
ii

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0 lSO/IEC ISOAEC 13522-3: 1997(E)
8.1.1.1.6 unsigned long type . 14
float type . 14
8.1.1.1.7
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 identifier type .
15
8.1.1.1.12 object reference type .
15
8.1.1.2 Predefined constructed types .
............................ 15
8.1.2 Declared constructed types .
.......................................... .............................. 15
8.1.2.1 sequence types
string types . 16
8.1.2.2 .
array types . . 16
8.1.2.3
structure types . . 17
8.1.2.4
........................... .................. 17
8.1.2.5 union types .
....................................... 17
82 . Data .
......................................... ............. 18
8.2.1 Immediate values .
..................................................... 18
8.2.2 Constants .
....................................... 18
8.2.3 Variables .
Global variables . . . 19
8.2.3.1
Local variables . . 19
8.2.3.2
Dynamic variables . . 19
8.2.3.3
........................................... ........................................ 19
83 . Functions .
............................................................................................................. 20
8.3.1 Routines
20
............................................................................ ..................................
8.3.2 Services
................................................... ....................................... 21
8.3.3 Predefined functions
21
84 . Messages .
21
...........................................................................................
8.4.1 Package exceptions
........................................................................................ 22
8.4.2 Predefined messages
............................................................................ 22
. Instructions .
85
22
86 . Identifiers .
22
...................................................................................................
8.6.1 Type identifiers
................................................................................................... 23
8.6.2 Data identifiers
................................................ ............................................. 23
8.6.3 Function identifiers
............................................................................................ 23
8.6.4 Message identifiers
23
9 The MHEG-SIR virtual machine .
........................................................................... 24
. Structure of the MHEG-SIR virtual machine
91
24
Structures and notations .
92 .
24
9.2.1 Table .
................................................... 24
9.2.2 Stack .
25
9.2.3 Parameter stack .
..................................................... 25
9.2.4 Queue .
........................................................................................... 25
Data representation
9.2.5
........................................................................ 26
.................................................
93 . Memory areas
.................................................................................... 26
M h-script memory areas
9.3.1
27
................................................................................
9.3.1 .I Data areas
27
Type definition table .
9.3.1.1.1
27
Constant table .
9.3.1.1.2
.................. 27
Global variable definition table
9.3.1.1.3
27
...............................................................................
9.3.1.2 Code areas
.............................. 27
9.3.1.2.1 Routine definition table
............................ 28
9.3.1.2.2 Package definition table
.............................. 28
9.3.1.2.3 Service definition table
Exception definition table . 28
9.3.1.2.4
Handler definition table . 29
9.3.1.2.5
9.3.1.2.6 Program code area .
29
. . .
III

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0 ISO/IEC
ISO/IEC 13522=3:1997(E)
........................................ .............................................. 29
9.3.2 Rt-script memory areas
............................................................ 29
9.3.2.1 Dynamic memory areas
Variable table . .29
9.3.2.1 .l
Call stack . . 30
9.3.2.1.2
Parameter stack . 30
9.3.2.1.3
Message queue . 31
9.3.2.1.4
...... ........................................... 31
9.3.2.1.5 Heap
31
9.3.2.2 Registers .
Instruction pointer register . 32
9.3.2.2.1
Instruction register . 32
9.3.2.2.2
Error register . 32
9.3.2.2.3
Stack pointer register . 32
9.3.2.2.4
Frame pointer register . 32
9.3.2.2.5
Queue pointer register . 32
9.3.2.2.6
Function register . 32
9.3.2.2.7
........................................................................................................................ 33
94 . Script statuses
.............................................................................................. 33
Mh-script statuses
9.4.1
...................................... ....................................... 33
9.4.1 .I Not available
................................................................................... 33
9.4.1.2 Available
............................................................................................... 33
Rt-script statuses
9.4.2
................................... ........ .................................... 33
9.4.2.1 Not ready
.................................. .............................................. 33
9.4.2.2 Ready
34
Running . . .
9.4.2.3
34
Erroneous . .
9.4.2.4
34
.................................................................... .................................................
Processing units
95 .
34
.............................................................................................
9.5.1 Message reception
34
MHEG-3 API operations .
9.5.1 .l
.......................... 34
External exception .
9.5.1.2
....................................... 35
InstructionExecutionError exception.
9.5.1.3
35
MHEG-3 API exception .
9.5.1.4
35
.........................................................................................
Mh-script initialisation
9.5.2
35
..........................................................................................
Rt-script initialisation
9.5.3
36
.......................................................................................
Rt-script execution unit
9.5.4
36
.................................................................
MHEG-SIR instruction execution unit
9.5.5
36
..................................................... .....................................
10 Provisions for run-time environment access
36
........................................................................................................................
10.1 General model
37
..................................................................................................
Declaration of IDL interfaces
10.2
38
................................................
Invocation of external operations in an MHEG-SIR program.
10.3
................................................... 38
Handling of external exceptions in an MHEG-SIR program
10.4
....................................................... 38
Invocation of external operations by an MHEG-3 engine
10.5
......................................................... 38
Handling of external exceptions by an MHEG-3 engine
10.6
............................................................................................. 39
Platform mapping specifications
10.7
39
..............................................................................................
II Provisions for MHEG object manipulation
39
.............................................................................. ............................
Invoking MHEG actions
11.1
39
....................................................................
11.1.1 Sending messages to other scripts
40
.....................................................
11.1.2 Exchange of information with MHEG objects
40
...................................................................................................
Receiving MHEG messages
11.2
40
....................................... ........................................
11.2.1 MHEG-3 API run operations
40
........................................................................................
1 I .2.2 MHEG API exceptions
40
.........................................................................................................................
12 MHEG-SIR declarations
41
.....................................................................................................................
12.1 Type declaration
41
.....................................................................................................
12.1.1 Type identifier
41
....................................................................... ..........................
12.1.2 Type description
iv

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0 lSO/IEC ISO/IEC 13522=3:1997(E)
12.1.2.1 String description . 42
12.1.2.2 Sequence description . 42
12.1.2.3 Array description . 42
12.1.2.4 Structure description . 42
12.1.2.5 Union description . 42
12.2 Constant declaration . 43
12.2.1 Data identifier . 43
12.2.2 Type identifier . 43
.............................................
12.2.3 Constant value . 43
44
12.3 Global variable declaration .
..................................................................................................... 44
12.3.1 Data identifier
...............................................................
Type identifier . 44
12.3.2
Constant reference . 44
12.3.3
12.4 Package declaration . 45
........................................................
12.4.1 Package identifier . 45
................ 45
12.4.2 Name .
............................................................................................. 45
12.4.3 Service description
Function identifier . 45
12.4.3.1
Name . 46
12.4.3.2
Calling mode . . 46
12.4.3.3
Type identifier . 46
12.4.3.4
Parameter description . 46
12.4.3.5
12.4.3.5.1 Passing mode . 46
Type identifier . 47
12.4.3.5.2
......................................................................................... 47
‘I 2.4.4 Exception description
Message identifier . 47
12.4.4.1
Parameter description . 47
12.4.4.2
................................................................................................................ 47
12.5 Handler declaration
.............................................................................................. 48
12.5.1 Message identifier
............................................................................................... 48
12.5.2 Function identifier
............................................................. .................................................... 48
12.6 Routine declaration
............................................................................................... 48
12.6.1 Function identifier
..................................................................................................... 48
12.6.2 Type identifier
48
12.6.3 Parameter description .
........................................................................... 49
12.6.3.1 Passing mode
......................................................................... 49
12.6.3.2 Type identifier.
........................................... 49
Local variable declaration .
12.6.4
............................................... 49
12.6.4.1 Data identifier .
..................................... 49
12.6.4.2 Type identifier .
.................................................... 49
12.6.4.3 Constant reference. .
........................... 50
Program code .
12.6.5
.............................. 50
........................................................... .................................
13 MHEG-SIR instructions
.............................. 50
........................................................................
13.1 Presentation methodology
..................................... 50
Error conditions . .
13.1.1
......................................... 51
Formal specification .
13.1.2
................................. 51
Data table notation .
13.1.3
......................................... 51
Template instruction notation .
13.1.4
.................................................... 52
Primitives .
13.1.5
............................................. ................................... 52
Classification of MHEG-SIR instructions
13.2
................................................................... 54
Description of instructions .
13.3
............................................ 54
13.3.1 No operation .
54
13.3.2 Yield . .
54
13.3.3 Return .
................. 55
13.3.4 Free .
55
13.3.5 Not . .
V

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............................................................................................... ................ 56
13.3.6 Or
........................................................................................................ 56
13.3.7 Exclusive or
57
13.3.8 And .
.................................................................................................. 57
13.3.9
Equal reference
58
13.3.10 .
Equal
58
13.3.11 .
Less than
....................................................................................................... 59
13.3.12 Greater than
.................................................................................................................. 59
Add
13.3.13
59
Subtract .
13.3.14
60
Multiply .
13.3.15
................................................................................................................. 60
Divide
13.3.16
................................................................................................................ 61
Negate
13.3.17
61
..........................................................................................................
Remainder
13.3.18
............................................................................................................ 62
Duplicate
13.3.19
............................................................................................................... 62
13.3.20 Convert
...................................................................................................... 62
13.3.21 Jump on true
63
.....................................................................................................
13.3.22 Jump on false
63
.................................................................................................................
13.3.23 Jump
................................................................................................................. 64
13.3.24 Shift
64
...........................................................................................
13.3.25 Get object reference
65
..............................................................................................
13.3.26 Long jump on true
65
.............................................................................................
13.3.27 Long jump on false
65
...........................................................................................................
13.3.28 Long jump
66
.................................................................................................................
13.3.29 Call
........................................................................................................ 67
13.3.30 External call
................................................................................................................ 68
Push
13.3.31
................................................................................................... 69
13.3.32 Push reference
.................................................................................................. 69
Push immediate
13.3.33
70
................................................................................................................
13.3.34
POP
70
.....................................................................................................
13.3.35 Pop reference
70
......................................................................................................
13.3.36 Pop contents
............................................................................................................... 71
13.3.37 Allocate
71
...........................................................................................................
13.3.38 Increment
72
..........................................................................................................
13.3.39 Decrement
72
................................................................................................................
13.3.40 Get
73
.......................................................................................................
13.3.41 Get contents
74
...............................................................................................................
13.3.42 Set
75
.......................................................................................................
13.3.43 Set contents
TP
............................................................................................................. f3
Type conversion rules
13.4
76
......................................................................................
Reversible conversions
13.4.1
........................................................................................... 76
Lossless extensions
13.4.2
........................................................ 76
...