Bibliography | Rothermel, Kurt; Helbig, Tobias: Clock Hierarchies: An Abstraction for Grouping and controlling Media Systems. In: IEEE Journal on Selected Areas in Communications - Synchronization Issues in Multimedia Communications, 1996. Vol. 14(1). University of Stuttgart, Faculty of Computer Science. pp. 1-23, english. Stuttgart: Uni-Stuttgart, January 1, 1996. Article in Journal.
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CR-Schema | A (General Literature)
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Keywords | Distributed Multimedia System; System Services Interface; Stream Synchronization; Grouping |
Abstract | Synchronization plays an important role in multimedia systems at various levels of abstraction. In this paper, we propose a set of powerful abstractions for controlling and synchronizing continuous media streams in distributed environments. The proposed abstractions are based on a very general computation model, which allows media streams to be processed (i.e. produced, consumed or transformed) by arbitrarily structured networks of linked components. Further, compound components can be composed of existing ones to provide higher levels of abstractions. The clock abstraction is provided to control individual media streams, i.e. streams can be started, paused or scaled by issuing the appropriate clock operations. Clock hierarchies are used to hierarchically group related streams, where each clock in the hierarchy identifies and controls a certain (sub)group of streams. Control and synchronization requirements can be expressed in a uniform manner by associating group members with control or sync attributes. An important property of the concept of clock hierarchies is that it can be combined in a natural way with component nesting.
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Full text and other links | PDF (75003 Bytes) PostScript (218489 Bytes)
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Contact | [rothermel,helbig]informatik.uni-stuttgart.de |
Department(s) | University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems
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Entry date | July 19, 2001 |
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