Distributed Multimedia Systems

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Distributed Multimedia Systems

• Resource management and Stream Adaptation

Arun A Tharuvai CSC8530 October 21, 2003
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Topics

• Summary of Distributed Multimedia Systems
• Resource Management
• Stream Adaptation

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Introduction

• hmm

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Characteristics of multimedia

• Continuous
• Isochronous (time-based)
• Bandwidth intensive
• Compressible

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Quality of Service (QoS) Management

• Management and allocation of resources to
  guarantee service
• QoS Manager negotiates requirements with
  applications against existing resources

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Resource Management

• Management of Resources to provide minimal QoS
  level to application
• Resource Scheduling
• Fair Scheduling
• Real time Scheduling

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Resource Scheduling

• Priority determination techniques
• Responsiveness
• Fairness
• Deadline handling

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Fair scheduling

• Round-robin queuing either by packet or by bit to
  prevent bandwidth clogging
• Equal bandwidth is assigned to each stream
• Weighted fair queuing is a variant

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Real-time Scheduling

• Assign CPU time slots to processes, ensuring
  tasks
• EDF Earliest Deadline First
• RM Rate monotonic
• QoS cant be guaranteed

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Stream Adaptation

• Applications adjust performance
• Scaling
• Filtering

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Scaling

• Adapt stream to the bandwidth available at source
• Subsample stream

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Scaling (II)

• Temporal scaling
• Spatial scaling
• Frequency scaling
• Amplitudinal scaling
• Color space scaling

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Filtering

• Applies scaling at nodes between source and
  destination
• Streams are partitioned into hierarchical quality
  dependent substreams.
• Dropped when node capacity is full

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Conclusion

• Two techniques for ensuring that multimedia
  systems transfer from source to destinations
• Resource management
• Stream Adaptation