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Part 2
• Multimedia Representation Control
• MediaLisp Interpreter
• System Demonstration
• Conclusion
Multimedia Representation
Control
•
•
•
•
System & Phase
User Selection
Automatic Selection
Example
System
• Media lisp maintains a set of system properties.
Those properties can be used to configure the
behavior of the overall environment for the
multimedia presentation.
• System properties include a basic set of preserved
properties and user customnized properties.
System Preserved Properties
The set of system properties contain at least :
– Physical time Interval
– Error handling policy
– Supported multimedia types
corresponding media players
and
System Property Semantics
Each entry of system property is “name-value” pair,
it can be can be referenced by its unique name
(GetSProperty property_name)
(SetSProperty property_name property_value …)
Phase
• Phase provides much detailed control over
multimedia presentation.
• A phase is a sub runtime environment under
environment MediaLisp. Similarly, the system can
be regarded as an overall phase over the whole
multimedia presentation.
• When a phase is bound to a some specific
multimedia objects, MediaLisp will use the
properties of the phase specified in the phase
instead of the system proterties.
Operations Related to Phase
• To declare a phase
• To set the Phase properties
• To retrieve the Phase properties
• To bind multimedia objects in the
presentation to phase.
Selection
The most prominent feature of MATN model is the
support of selections. The selection can be
classified as:
– User Selection: In the middle of presentation, the
choice needs to by made by user involvement
– Automatic Selection: The decision is conducted by the
specification in the “Condition Table”
Case
The semantics of “Case” is designed for user
selection, its semantics includes:
• A prompt (string array) that will be
displayed at presentation time for
interactively accepting user selections
• A sequence of multimedia objects
correspond to the prompt strings
respectively
Select
• “Select” is used to specify the “Condition Table”.
• Each entry in the condition table consists of a boolean
clause to describe arbitrarily complex condition and the
underlying action or the media object.
• A select clause contains a list of the condition-action
pairs.
• The condition must in the condition table consists of a
boolean
Example of User Selection <Script>
(setq T1(@ "T1"))
(duration "T1"
…………...
(setq A1 (@ "A1")) (duration "A1"
(setq A2 (@ "A2")) (duration "A2"
(setq A3 (@ "A3")) (duration "A3"
…………...
(setq Prompt
(Prompt
”Select audoi-1"
" Select audoi-2"
" Select audoi-3"))
(setq C (case Prompt A1 A2 A3 ))
…………...
(@ "V1") (duration "V1" 30)
…………...
(present (<< T1 C (? "V1")))
10)
10)
10)
10)
MATN and Running Result of the Example
Multimedia Lisp Interpreter
To support multimedia
MediaLisp must provide:
related
functionality,
 Multi-threaded execution and management support.
 Network communication ability
 Real-time management and synchronization.
 Intelligence to handle the semantic heterogeneity of
multimedia representation.
 The ability to display various multimedia objects via
various devices.
Steps Involved in Interpretion
• To invoke common lisp compiler/interpreter to
accomplish syntax and semantic check, process
all pure lisp aspects (Arithmetic operation,
common variable & clause evaluation).
• An extra procedure to process all multimedia
presentation related semantics to generate a
MATM like data structure. This data structure
will be used to direct the multimedia
presentation.
System Demonstration
The following
example is used to
give a rough
outlook of the
design idea.
<script>
(setq m1 (@ "mm_1" ))(setq m2 (@ "mm_2"))(setq m3 (@ "mm_3"))
(setq m11 (@ "m11" ))(setq m12 (@ "m12"))(setq m13 (@ "m13"))
(Duration m11 10) (Duration m12 40)(Duration m13 30)
(setq m91 (@ "m91" ))(setq m92 (@ "m92"))(setq m93 (@ "m93"))
(Duration m91 10)(Duration m92 5)(Duration m93 5)
(setq m911 (@ "m81" ))
(setq m922 (@ "mm82"))
(setq m933 (@ "mm83"))
(setq yy (prompt "option #1" "option #2" "option #3" ))
(setq cc (case yy (|| m91 m911) (<< m92 m922) (|| m93 m933) ))
(setq ww1 (<< m1 m2 m3 cc))
(setq ww2 (|| m11 m12 m13))
(present (<< ww1 ww2))
Parsed MATN
Media Object Property Set
Presentation Simulation
Summary
• It’s expressive enough to describe arbitrarily
complex temporal relationship among
multimedia objects in a presentation
• It provides a practicable way to encode
condition tables and user selection.
• It also provides a concrete evidence to
prove that the MATN model is both feasible
and practicable.