A master-medium-based interactive synchronization control scheme for distributed multimedia systems

Huang, Chung-Ming; Wang, Chian; Kuo, Cheng-Yi

doi:10.1109/eurmic.1998.708064

Cited by 5 publications

References 6 publications

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Modeling with enhanced prioritized Petri nets: EP-nets

Guan

Lim

2002

Computer Communications

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Recently, many researchers have their attention focused on interactive temporal models, like the extended finite state machines or the extended Petri net models. One of the recent mechanisms proposed for synchronization is known as the Prioritized Petri net, P-Net, which is implemented in the Distributed Object Composition Petri Net, DOCPN. The development of DOCPN has achieved media synchronization in distributed multimedia environments. This P-Net mechanism holds a powerful property: if the deadline is due, it forces firing events regardless whether they are ready or not. A side effect might occur, which is known as premature/late arriving tokens. This paper addresses the key issue of providing flexible multimedia presentation with user interaction and suggests improved P-Net models, which handles premature/late arriving tokens, accommodates dynamic event mechanisms and can specify user interactions in real time during presentation. To demonstrate the concepts are feasible, a prototype with runtime support has been developed and used to construct several interactive multimedia applications, including skip, freeze and restart, reverse, speed scaling, and multicasting.

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Modeling with enhanced prioritized Petri nets: EP-nets

Guan

Lim

2002

Computer Communications

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Modeling adaptable multimedia and self-modifying protocol execution

Guan

Lim

2004

Future Generation Computer Systems

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Over the years, researchers have tried to extend Petri net to model multimedia. The focus of the research flows from the synchronization of multimedia without user interactions, to interactions in distributed environments. The issues in concern are the flexibility and compactness of the model when applied to model a system under change. Most existing models lack the power to model a system under change during execution. Petri net extensions have been developed to facilitate user interactions (UI) in distributed environments, however they require sophisticated pre-planning to lay out detailed schedule changes. On the other hand, there has been active research on self-modifying protocols or adaptive protocols in recent years. Plenty of models have been developed to model communication protocol execution, to name a few, finite state machines, communicating finite state machines, Petri nets. However, there exist no suitable models to simulate protocols that are self-modifying or adaptive during execution. In this paper, we propose a Reconfigurable Petri Net (RPN) for adaptable multimedia. A RPN comprises of a novel mechanism called modifier. This modifier can create a new change or delete an existing mechanism (e.g. arc, place, token, transition, etc.) of the net. In a way, modifier embraces controllability, reconfigurability, and programmability into the Petri net, and enhances the real-time adaptive modeling power. This development allows a RPN to have a greater modeling power over other extended Petri nets. The paper includes both the model and theory required to establish the technique's validity. Examples are also shown how RPN can be used to model interactive multimedia, and simulate self-modifying protocols. A simulator has been developed using Visual C++ under Windows NT to show that RPN is feasible.

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The development of an interactive music station over Internet

Huang

Liu

Shih

Proceedings 15th International Conference on Information Networking

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An Internet Interactive Music Station (IMS) is presented in this paper: The IMS system is a personal audio multicast transmission system and provides an interactive environment over Internet. The IMS server site plays the DJ role and can niulticast DJ's voice and MP3 music to multiple clients. The IMS client site plays the audience role and can receive audio and MP3 music from the IMS server: Additionallj\ IMS provides two features using the real time multimedia interaction technique. The first one is that IMS audience can transmit his voice to the IMS server with a call-in operation. The second one is that IMS offers the dual server mode to allow a secondaty DJ, who is geographically separated from the main DJ,to join the program. That is, two geographically separated DJs cooperatively control the program. Related technique issues and the corresponding system development of IMS are presented in detail in the paper: keywords: Internet, Interactive, Multicast, Music station. 279 0-7695-0951-7/01 $10.00 0 2001 IEEE

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A master-medium-based interactive synchronization control scheme for distributed multimedia systems

Cited by 5 publications

References 6 publications

Modeling with enhanced prioritized Petri nets: EP-nets

Modeling with enhanced prioritized Petri nets: EP-nets

Modeling adaptable multimedia and self-modifying protocol execution

The development of an interactive music station over Internet

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