Device and Physical RICHARD Department Portland, Data Independence WALPOLE, Engineering, @se. ogt.edu for Multimedia Presentations STAEHLI, of Computer <(staehli, JONATHAN Science walpole, and and DAVID MAIER Graduate Institute of Science & Technology, ) Oregon Oregon maler} Multimedia computing promises access to any type of visual or aural medium through digital networks. But can a given multimedia document be effectively accessed everywhere? The presentation of data must adapt to both the available communications bandwidth and the output device resolution. Current multimedia systems assume that applications require the highest possible quality and handle resource overloads through ad hoc methods, such as video frame dropping. To support a variety of applications with lower quality requirements, we need both new standards for scalable data encoding and new techniques for communicating application quality requirements. This paper describes a new approach for specifying quality of service (QoS) requirements based on functionality rather than on data encoding and device capabilities. The potential of distributed multimedia computing can be achieved by offering device-independent and physicaldata-independent service interfaces. Logical data independence is also desirable, but we omit discussion of it here in the interest of brevity. Device and physicaldata independence are well known principles of database system
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Device and physical data independence for multimedia presentations
Staehli, Richard; Walpole, Jonathan; Maier, David
Follow ACM Computing Surveys (CSUR)
, Volume 27 (4)
Association for Computing Machinery – Dec 1, 1995
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