Advances in D'O'SMultimedia applications

1
Advances in D.O.S(Multi-media applications)

• Definition 1
• Computer Media

Data type representation
transmission
Data type perception
Interchange presentation
Storage
media to transmit data
Media to present a text

User interface to data.

Physical media
media for data collection and production
2
Advances in D.O.S(Multi-media applications)

• Definition 2
• Multi-media How to handle a variety of
  presentation media in integrated manner.
• Variety of presentation
• from simple text to video, audio and
  animation.
• Integrated multimedia
• From single workstation to a distributed
  multimedia system.

3
Motivation for Multimedia

• End user motivation

Information overload and Starvation.
Distribution of information
education and commence
4
Motivation for Multimedia(Cont.)

• Technology Motivation

Advances in network Tech.
Advances in Storage Tech.
Network Service
Bandwidth ----------- ---------
------------ DQDB
Multi-Service(LAN) 150. Primary ISDN
(WAN) 1.9 BISDN
150-1200 GSM
DATAVoice
0.01 MBS Multi-Service mobile
2-150
Technology Technique Bandwidth
Capacity --------------- -----------
------------ --------- MD
Magnetic 1-5 100-400 CD
ROM 0.15-0.6
1000 000 CD/ROM/XA
015-0.6 650 MO
Meg-optic 0.2-0.2 500-5000 jukeboxes
optical 0.1-0.6 10x650
5
Motivation for Multimedia(Cont.)

• Advances in Compression technique
• Type Standardization Symmetry
  Coding Comp. Ratio
• ____ ______________ _________
  _____ __________
• JPEG ISO / CCIT symmetrical
  Intra-fram lt 701
• MPEG-I ISO 1992 Asymmetrical
  Intra-and lt2001
• 
  Inter fram
• MPEG-II ISO
  lt2001
• px64 CCIT,1990
  1001
• 
  -
  20001
• JPEG Joint Photographic Experts Grroup
• MPEG Motion Picture Expert Group
• px64 multiple of 64 KBPS

6
Requirements of D.O.S for Multi-Media
applications

• Continuos Media Support

Continuos data transfer
Maintaining ongoing timeliness
Problem caused Traditional forms of interaction
such as,
Synchronous, Asynchronous communication
and remote procedure calls.
7
Requirements of D.O.S for Multi-Media
applications(Cont.)

• QoS Requirments

• Management is to be added
• to each level of the system.
• Mapping between various
• layers are required. This
• ranges from user-oriented
• at highest level( e.g.
• video display ) to low level
• (e.g. 10 msmax. Delay)

Addition facilities are to be added such as,
service specification, negotiation, resource
reservation and admission control
8
Requirements of D.O.S for Multi-Media
applications(Cont.)

• Real Time Synchronization

• Inter-media synchronization
• Maintenance of real time constrains
• across more than one media type.
• (e.g lip synchronization between audio
• and video channels, or between text
• subtitle and Video sequences)

• Intra-media Synch.
• Maintenance of real time constrains
• across a single continuos media connection.
• (e.g to ensure that appropriate audio
  throughput,jitter
• and latency)

9
Requirements of D.O.S for Multi-Media
applications(Cont.)

• Multiparty communication

Multiparty Programming requirements (e.g
joining and leaving of groups at run-time)
Multicast Comm. For receivers that requires
different qualities of service.

Multi-application support per one user at
continuos time level .
10
Object Oriented approach to D.O.S

• Motivation to O.O.Approach

Encapsulation Data Abst. natural
extensibility reusability
subtyping
evolution easy to add
new implementation flexible
separation easy
replacement classes and new and
interface selection
between
objects inheritance of
services specification
and implementation


11
Reference Model(RM)-ODP

• Objects are accessed through one or more
  interfaces(each provide an abstract view of the
  object).
• One object service can be partitioned into a
  number of separate services(roles).
• Each role is visible at a distinct interface(e.g
  one interface is responsible for different
  operations on the object while another interface
  is responsible for its management.
• Objects are defined in terms of templates that
  contain a complete description for a given level
  of abstraction.
• Templates can be used to add more objects to the
  environment .The details of a template
• can vary from a complete implementation( like
  describing all data structure and algorithms
  required to implement distributed object.) to an
  abstract implementation like implementing an
  audio storage with a given specifications).