MPEG-4: Multimedia Coding Standard Supporting Mobile ...

MPEG-4: Multimedia Coding Standard Supporting Mobile ...

MPEG-4: Multimedia Coding Standard Supporting Mobile Multimedia System Lian Mo, Alan Jiang, Junhua Ding April, 2001 - Content Overview of Mobile Multimedia System MPEG-4 Features, System and DMIF MPEG-4 Video MPEG-4 Audio

MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 2 Overview of Mobile Multimedia System What is Mobile Multimedia System? Users carrying portable devices access to multimedia information from a shared infrastructure independent of their physical location Such as: PDA, Smart Phone, Palm PC, Wireless Terminal How it works? Terminal Devices + Communication Infrastructure Future devices and applications can be able to connect to different wireless networks Terminal is autonomous reconfigurable modules, interconnected by a switch,

and to offload as much as work as possible from the CPU to programmable modules that are placed in the data streams (MPEG-4 Chip ??) Requirements more functionality, bandwidth, QoS, (Motivation of MEPG-4 Development) MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 3 MPEG-4 System and DMIF Overview The Moving Picture Coding Experts Group is a working group of ISO/IEC in charge of the development of international standards for compression, decompression, processing, and coded representation of moving pictures,

audio and their combination. MPEG-1: a standard for storage and retrieval of moving pictures and audio on storage media. MPEG-2: a standard for digital television. MPEG-7: a content representation standard for information search MPEG-4: a standard for coding of audiovisual information in multimedia systems. It provides audiovisual functionality including content manipulation, content scalability and content-based access, for multimedia systems MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 4 Goals of MPEG-4

--Content-based interactivity: Object based representation of multimedia data, compose these objects to form multimedia scene --Universal accessibility: The ability to access audiovisual data over a diverse range of storage and transmission media --Efficient compression MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 5 MPEG-4 System MPEG-4 System deals with the encoding of audio and visual information (the coding of audiovisual is based on the previous MPEG-1 and MPEG-2 and with optimization).

deals with the information related to the combinations of streams: combination of audiovisual objects to create an interactive audiovisual scene, synchronization of streams, multiplexing of streams for storage or transport. MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 6 Architecture of MPEG-4 System MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 7

DMIF(Delivery Multimedia Integration Framework) DMIF is a session protocol for the management of multimedia streaming over generic delivery technologies delivery integration of three major technologies: the broadcast technology, the interactive network technology and the disk technology It is similar to FTP in principle, but it returns pointers to where to get streamed data, but the FTP returns data The functionality provided by DMIF is expressed by an interface called DMIF-Application Interface (DAI), and applications access information from the underlie network or storage through the provided primitives, which will be translated into protocol messages MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems

8 DMIF Computation Model Originating DMIF Target DMIF 4 App App1 App2 1 3

2 DMIF DMIF MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 9 Object-based Representation and BIFS -- Objects have typically a semantic associated and are user meaningful entities in the context of the relevant application. -- an audiovisual scene as a composition of audiovisual objects with specific characteristics and behavior, notably in space and time

BInary Format for Scene description (BIFS) -- MPEG-4 scene follows a hierarchical structure, which can be represented as a directed acyclic graph. -- Each node of the graph is a media object, the leaf nodes are primitive objects, and the middle nodes correspond to the compound nodes. -- The tree structure are dynamic, and the BIFS provides commands to support the operations -- BIFS Commands (add, remove, update, ) to manipulate the multimedia scene MPEG-4: Multimedia Coding Standa rd Supporting Mobile Multimedia Sy stems 10

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