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ISO/IEC 14478-3-ed.1.0
Information technology - Computer graphics and image processing - Presentation Environment for Multimedia Objects (PREMO) - Part 3: Multimedia Systems Services
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NORM herausgegeben am 20.12.1998
Informationen über die Norm:
Bezeichnung normen: ISO/IEC 14478-3-ed.1.0
Ausgabedatum normen: 20.12.1998
SKU: NS-941025
Zahl der Seiten: 74
Gewicht ca.: 222 g (0.49 Pfund)
Land: Internationale technische Norm
Kategorie: Technische Normen ISO
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Die Annotation des Normtextes ISO/IEC 14478-3-ed.1.0 :
This part of ISO/IEC 14478 defines a standard set of multimedia system services that can be used by multimedia application developers in a variety of computing environments. The focus is on enabling multimedia applications in a heterogeneous, distributed computing environment. Throughout this part of ISO/IEC 14478, this component will also be referred to as "Multimedia Systems Services", and abbreviated as MSS. The Multimedia Systems Services constitutes a framework of "middleware" - system software components lying in the region between the generic operating system and specific applications. As middleware, the Multimedia Systems Services marshals lower-level system resources to the task of supporting multimedia processing, providing a set of common services which can be used by multimedia application developers. The Multimedia Systems Services encompasses the following characteristics: a) provision of an abstract type for a media processing node, extensible through subtyping to support abstractions of real media processing hardware or software; b) provision of an abstract type for the data flow path or the connection between media processing nodes, encapsulating low-level connection and transport semantics; c) grouping of multiple processing nodes and connections into a single unit for purposes of resource reservation and stream control; d) provision or a media dataflow abstraction. with support for a variety of position, time and/or synchronization capabilities; e) separation of the media format abstractions from the dataflow abstraction; f) synchronous exceptions and asynchronous events; g) application visible characterization of object capabilities; h) registration of objects in a distributed environment by location and capabilities; i) retrieval of objects in a distributed environment by location and constraints; j) definition of a Media Stream Protocol to support media independent transport and synchronization. The Multimedia Systems Services rely on the object model of ISO/IEC 14478-1 (Fundamentals of PREMO) and the object types and non-object data types defined in TSO/IEC 14478-2 (PREMO Foundation Component).
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