Adaptive Presentation and Scheduling of Media Streams on Parallel Storage Servers

Adaptive Presentation and Scheduling of Media Streams on Parallel Storage Servers

Constantinos Mourlas (National & Kapodistrian University of Athens, Greece)
DOI: 10.4018/978-1-60566-032-5.ch011
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One way to implement adaptive software is to allocate resources dynamically during run-time rather than statically at design time. Design of adaptive software and adaptive execution of processes are key factors that improve versatility of software and decrease maintenance costs. In this chapter we study the development of adaptive software focusing on a design strategy for the implementation of parallel media servers with an adaptable behaviour. This strategy makes the timing properties and the quality of presentation of a set of media streams predictable. The proposed adaptive scheduling approach exploits the performance of parallel environments and seems a promising method that brings the advantages of parallel computation in media servers. The proposed mechanism provides deterministic service for both Constant Bit Rate (CBR) and Variable Bit Rate (VBR) streams. We present an efficient placement strategy for data frames as well as an adaptability strategy that allows appropriate frames to be dropped without sacrificing the ability to present multimedia applications predictably in time.
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The Architecture Of The Parallel Media Server

One common server architecture is the single processing model. However, this single processor server model has its limitations like performance, scalability, low transfer rate and low capacity. Recently, much research has been made on the topic of parallel systems in the community of parallel computing. In order to design a general purpose architecture which can be adapted to the current user requirements, a scalable parallel multimedia server shall be designed.

We will use the traditional model for a parallel media server previously described in (Wu & Shu, 1996; Jadav et al., 1997b). In that architecture there exist three kinds of nodes: storage nodes, delivery nodes and one control node (see Figure 1). The three kinds of nodes are explained in greater detail below:

Figure 1.

The logical model of the parallel media server

Storage nodes are responsible for storing video and audio clips, retrieving requested data blocks and sending them to delivery nodes within a time limit. In addition, partitioned media blocks are wide striped among storage nodes in a round-robin fashion to balance the workload.

Delivery nodes are responsible for serving stream requests that have been previously accepted for service. Their main function is to request the striped data from the storage nodes through the internal interconnection network, re-sequence the packets received if necessary and then send the packets over the wide area network to the clients.

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Table of Contents
Barry Smyth
Constantinos Mourlas, Panagiotis Germanakos
Constantinos Mourlas, Panagiotis Germanakos
Chapter 1
Nikos Tsianos, Panagiotis Germanakos, Zacharias Lekkas, Constantinos Mourlas
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Assessment of Human Factors in Adaptive Hypermedia Environments
Chapter 2
Barry Smyth
Everyday hundreds of millions of users turn to the World-Wide Web as their primary source of information during their educational, business and... Sample PDF
Case Studies in Adaptive Information Access: Navigation, Search, and Recommendation
Chapter 3
Sherry Y. Chen
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The Effects of Human Factors on the Use of Web-Based Instruction
Chapter 4
Gulden Uchyigit
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The Next Generation of Personalization Techniques
Chapter 5
Nancy Alonistioti
This chapter introduces context-driven personalisation of service provision based on a middleware architectural approach. It describes the emerging... Sample PDF
Advanced Middleware Architectural Aspects for Personalised Leading-Edge Services
Chapter 6
Syed Sibte Raza Abidi
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Intelligent Information Personalization: From Issues to Strategies
Chapter 7
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This chapter introduces a semantically adaptive interface as a means of measuring the quality of egovernment portals, based on user feedback. The... Sample PDF
A Semantically Adaptive Interface for Measuring Portal Quality in E-Government
Chapter 8
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While the World Wide Web user is suffering form the disease caused by information overload, for which personalization is one of the treatments which... Sample PDF
Ontology-Based Personalization of E-Government Services
Chapter 9
Maria Golemati, Costas Vassilakis, Akrivi Katifori, George Lepouras, Constantin Halatsis
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Chapter 10
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Integrating Semantic Knowledge with Web Usage Mining for Personalization
Chapter 11
Constantinos Mourlas
One way to implement adaptive software is to allocate resources dynamically during run-time rather than statically at design time. Design of... Sample PDF
Adaptive Presentation and Scheduling of Media Streams on Parallel Storage Servers
Chapter 12
Gheorghita Ghinea
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Impact of Cognitive Style on User Perception of Dynamic Video Content
Chapter 13
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Chapter 14
Rafael Morales, Nicolas Van Labeke, Paul Brna, María Elena Chan
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Open Learner Modelling as the Keystone of the Next Generation of Adaptive Learning Environments
Chapter 15
Klaus Jantke, Christoph Igel, Roberta Sturm
Humans need assistance in learning. This is particularly true when learning is supported by modern information and communication technologies. Most... Sample PDF
From E-Learning Tools to Assistants by Learner Modelling and Adaptive Behavior
Chapter 16
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The process of training and learning in Web-based and ubiquitous environments brings a new sense of adaptation. With the development of more... Sample PDF
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Chapter 17
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About the Contributors