Over view(编码) standardized ways to support ■ Coding(编码) representing units of audio, visual, audiovisual content Composition(合成) I describing how these objects are composed together to produce compound media objects Multiplex(多路复用和合成) a multiplex and synchronize data associated with media objects ■ Interaction(交互性) a interacting with user
OverView（编码） ◼ standardized ways to support: ◼ Coding（编码） ◼ representing units of audio, visual, audiovisual content ◼ Composition（合成） ◼ describing how these objects are composed together to produce compound media objects ◼ Multiplex（多路复用和合成） ◼ multiplex and synchronize data associated with media objects ◼ Interaction（交互性） ◼ interacting with user
System overview(解码) a number of decoders for each type of media(解码) a a composition process which puts the decoded parts together(分量合成) composition ideas are similar to VRML(合成方法) a scene graph of objects composition information is defined in the links hierarchical structure, not necessarily static composition stream has extra information for mp4 a spatial relationships a temporal relationships
System overview（解码） ◼ a number of decoders for each type of media（解码） ◼ a composition process which puts the decoded parts together（分量合成） ◼ composition ideas are similar to VRML（合成方法） ◼ scene graph of objects ◼ composition information is defined in the links ◼ hierarchical structure, not necessarily static ◼ composition stream has extra information for mp4 ◼ spatial relationships ◼ temporal relationships
voice multiplexed sprite presentation downstream control/ data 2D background multiplexed SCere controddata coordinate System X userevents compositor projector hypothetical viewer C display userinput
scene person 2D background furniture audiovisual presentation voice sprite globe desk
Decompression Composition and Rendering Primitive AV Objects Scene Description (Script or Classes Hierarchical, Interactive Audiovisual Scene Composition Infomation