【英文标准名称】:Informationtechnology-Computergraphicsandimageprocessing-Presentationenvironmentformultimediaobjects(PREMO)-Multimediasystemsservices
【原文标准名称】:信息技术.计算机制图学和图象处理.多媒体目标表示环境(PREMO).多媒体系统服务
【标准号】:BSISO/IEC14478-3-1999
【标准状态】:现行
【国别】:英国
【发布日期】:1999-03-15
【实施或试行日期】:1999-03-15
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:信息交流;数据结构;计算机制图;数据传输;多媒体;数据组织;图解表示法;流程图;质量;数据处理(软件);视频信号;计算机应用;目标(数据处理);图形表示;数据处理;声信号;编码(数据转换);代码表示
【英文主题词】:Computergraphics;Dataconversion;Dataprocessing;Definition;Definitions;Encoding;Imageprocessing;Informationinterchange;Informationtechnology;Multimedia
【摘要】:ThispartofISO/IEC14478definesastandardsetofmultimediasystemservicesthatcanbeusedbymultimediaapplicationde-velopersinavarietyofcomputingenvironments.Thefocusisonenablingmultimediaapplicationsinaheterogeneous,distrib-utedcomputingenvironment.ThroughoutthispartofISO/IEC14478,thiscomponentwillalsobereferredtoas"MultimediaSystemsServices",andabbreviatedasMSS.TheMultimediaSystemsServicesconstitutesaframeworkof"middleware"—systemsoftwarecomponentslyingintheregionbetweenthegenericoperatingsystemandspecificapplications.Asmiddleware,theMultimediaSystemsServicesmarshalslow-er-levelsystemresourcestothetaskofsupportingmultimediaprocessing,providingasetofcommonserviceswhichcanbeusedbymultimediaapplicationdevelopers.TheMultimediaSystemsServicesencompassesthefollowingcharacteristics:a)provisionofanabstracttypeforamediaprocessingnode,extensiblethroughsubtypingtosupportabstractionsofreal,mediaprocessinghardwareorsoftware;b)provisionofanabstracttypeforthedataflowpathortheconnectionbetweenmediaprocessingnodes,encapsulating;low-levelconnectionandtransportsemantics;c)groupingofmultipleprocessingnodesandconnectionsintoasingleunitforpurposesofresourcereservationandstreamcontrol;d)provisionofamediadataflowabstraction,withsupportforavarietyofposition,timeand/orsynchronizationcapabili-ties;e)separationofthemediaformatabstractionsfromthedataflowabstraction;f)synchronousexceptionsandasynchronousevents;g)applicationvisiblecharacterizationofobjectcapabilities;h)registrationofobjectsinadistributedenvironmentbylocationandcapabilities;i)retrievalofobjectsinadistributedenvironmentbylocationandconstraints;j)definitionofaMediaStreamProtocoltosupportmediaindependenttransportandsynchronization.TheMultimediaSystemsServicesrelyontheobjectmodelofISO/IEC14478-1(FundamentalsofPREMO)andtheobjecttypesandnon-objectdatatypesdefinedinISO/IEC14478-2(PREMOFoundationComponent).
【中国标准分类号】:L81
【国际标准分类号】:33_160_60;35_140
【页数】:86P;A4
【正文语种】:英语