La Cohérence dans les Applications Multimédia Interactives et Distribuées : du concert réparti sur Internet aux jeux multijoueurs en réseau

Abstract : The design of Distributed Interactive Multimedia Applications (DIMA) on Internet opens new perspectives to work and to have fun in a collaborative way. In these applications, the feeling of co-presence between users is obtained with a digitizing of their actions and a network. However, network transmission delays introduce temporal ambiguities on the user interface. This problem is well-known under the name of consistency, but it is generally treated from an order point of view, instead of physical time one. Thus, we provide formal descriptions to study consistency models. It includes temporal (instantaneity, simultaneity and $\Delta$ legality) and scheduling properties and allows to take into account psycho-perceptive constraints. From these formal definitions, we propose some consistency models and consistency protocols. We implement one of them in nJam, our Networked Musical Performance system (NMP). Our results allow to build a distributed metronome shared between remote musicians, in spite of high latencies on the network. Thanks to public demonstrations and user experiments, we show the practical effectiveness of nJam. Moreover, we show that our results can improve performance of distributed games. Currently, in the DIMA domain, our results are the only ones that take into account network latencies while providing the Perceptive Consistency in a fully distributed way.
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https://tel.archives-ouvertes.fr/tel-00145440
Contributor : Nicolas Bouillot <>
Submitted on : Thursday, May 10, 2007 - 12:47:13 PM
Last modification on : Wednesday, March 20, 2019 - 4:52:04 PM
Long-term archiving on : Wednesday, April 7, 2010 - 12:47:58 AM

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Nicolas Bouillot. La Cohérence dans les Applications Multimédia Interactives et Distribuées : du concert réparti sur Internet aux jeux multijoueurs en réseau. Réseaux et télécommunications [cs.NI]. Conservatoire national des arts et metiers - CNAM, 2006. Français. ⟨tel-00145440⟩

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