【英文标准名称】:Informationtechnology-Codingofaudio-visualobjects-Part20:LightweightApplicationSceneRepresentation(LASeR)andSimpleAggregationFormat(SAF)
【原文标准名称】:信息技术.音视对象的编码.第20部分:轻型应用像幅表示法(LASeR)和简单聚合形式(SAF)
【标准号】:ISO/IEC14496-20-2006
【标准状态】:作废
【国别】:国际
【发布日期】:2006-06
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1/SC29
【标准类型】:()
【标准水平】:()
【中文主题词】:视听;视听资料;传播技术;数据格式;数据传送;定义;编码;信息技术;交互式;多媒体;多路传送
【英文主题词】:Audiovisual;Audiovisualmaterials;Communicationtechnology;Dataformats;Datatransfer;Definition;Definitions;Encoding;Informationtechnology;Interactive;Multimedia;Multiplex
【摘要】:ThisInternationalStandarddefinesascenedescriptionformat(LASeR)andanaggregationformat(SAF)respectivelysuitableforrepresentinganddeliveringrich-mediaservicestoresource-constraineddevicessuchasmobilephones.LASeRaimsatfulfillingalltherequirementsofrich-mediaservicesatthescenedescriptionlevel.LASeRsupports:-anoptimizedsetofobjectsinheritedfromSVGtodescriberich-mediascenes;-asmallsetofkeycompatibleextensionsoverSVG;-theabilitytoencodeandtransmitaLASeRstreamandthenreconstructSVGcontent;-dynamicupdatingofthescenetoachieveareactive,smoothandcontinuousservice;-simpleyetefficientcompressiontoimprovedeliveryandparsingtimes,aswellasstoragesize,oneofthedesigngoalsbeingtoallowbothforadirectimplementationoftheSDLasdocumented,aswellasforadecodercompliantwithISO/IEC23001-1todecodetheLASeRbitstream;-anefficientinterfacewithaudioandvisualstreamswithframe-accuratesynchronization;-useofanyfontformat,includingtheOpenTypeindustrystandard;and-easyconversionfromotherpopularrich-mediaformatsinordertoleverageexistingcontentanddevelopercommunities.TechnologyselectioncriteriaforLASeRincludedcompressionefficiency,butalsocodeandmemoryfootprintandperformance.Otheraimsincluded:scalability,adaptabilitytotheusercontext,extensibilityoftheformat,abilitytodefinesmallprofiles,feasibilityofaJ2MEimplementation,errorresilienceandsafetyofimplementations.SAFaimsatfulfillingalltherequirementsofrich-mediaservicesattheinterfacebetweenmedia/scenedescriptionandexistingtransportprotocols:-simpleaggregationofanytypeofstream;-signalingofMPEGandnon-MPEGstreams;-optimizedpacketheadersforbandwidth-limitednetworks;-easymappingtopopularstreamingformats;-cachemanagementcapability;and-extensibility.SAFhasbeendesignedtocomplementLASeRforsimple,interactiveservices,bringing:-efficientanddynamicpackagingtocopewithhighlatencynetworks;-mediainterleaving;and-synchronizationsupportwithaverylowoverhead.ThisInternationalStandarddefinestheusageofSAFforLASeRcontent.However,LASeRcanbeusedindependentlyfromSAF.
【中国标准分类号】:L81
【国际标准分类号】:35_040
【页数】:
【正文语种】:英语