A general-purpose multimedia synchronization mechanism based on causal relations

Courtiat, Jean-Pierre; Carmo, Luiz Fernando Rust da Costa; Oliveira, Roberto C. de

doi:10.1109/49.481704

Cited by 25 publications

(10 citation statements)

References 21 publications

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“…So, temporal consistency in our model is different from that in [6]. Our relaxed form of WYSIWIS captures the user-level interactivity in collaborative environments.…”

Section: A Flexible Canonical Solutionmentioning

confidence: 93%

User-assisted tools for concurrency control in distributed multimedia collaborations

Sabbir

Ravindran

2004

Proceedings of the 12th Annual ACM International Conference on Multimedia

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In a distributed collaborative application, a key requirement is that all users see the same copy of a shared window object at any given point in time (WYSIWIS). In this paper, we study 'userassisted causal ordering' of messages as the basis for achieving WYSIWIS. The approach requires specifying the synchronization constraints on accessing shared window objects in the form of an order in which messages need to be processed and object state updated. The specifications are made available to the window subsystem based on the user-level knowledge about the actions on objects and the current (shared) object state. In contrast with the current approaches employing transaction models, our approach allows flexibility in the programming of collaboration-style applications, and offers increased levels of concurrency.

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“…So, temporal consistency in our model is different from that in [6]. Our relaxed form of WYSIWIS captures the user-level interactivity in collaborative environments.…”

Section: A Flexible Canonical Solutionmentioning

confidence: 93%

User-assisted tools for concurrency control in distributed multimedia collaborations

Sabbir

Ravindran

2004

Proceedings of the 12th Annual ACM International Conference on Multimedia

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“…In the literature, several mechanisms dealing with the problem of limiting delay jitter and/or skew in multimedia retrieval services have been presented [5][6][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Many of these mechanisms can be classified into two categories: the first one comprises mechanisms based on the use of buffers at the destination site, the second on modification of retrieval times at the source site so as to compensate for delay jitter.…”

Section: Introductionmentioning

confidence: 99%

Control of perceived quality of service in multimedia retrieval services: prediction-based mechanism vs. compensation buffers

et al. 1998

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In multimedia systems end-to-end delay jitter has a great impact on the continuity of information playback. Therefore, it is necessary to introduce appropriate mechanisms to compensate for delay variations, so that the intramedia and intermedia temporal relationships can be preserved. In this paper, two methods for compensation of the network delay jitter in a distributed multimedia retrieval service are compared: the first is based on prediction of the network delay jitter suffered by each information unit and retrieval time modification at the source site; the second is based on a compensation buffer at the destination site. Comparison is made by assuming a master/slave relationship between the monomedia streams composing the multimedia data flow.

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“…The work of J. P. Courtiat and et al [11] uses the notion of 'causality' to realize synchronization. But the specification model treats the 'causality' and 'real-time flow' notions separately, which necessitates more complex programming constructs.…”

Section: Causality Augmented With Time Deadlinesmentioning

confidence: 99%

Event-Based Programming Structures for Multimedia Information Flows

Ravindran

Sabbir

2004

Management of Multimedia Networks and Services

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Abstract. In this paper, we propose a programming model based on 'timed event dissemination' for structuring a distributed real-time multimedia presentation. In this model, event notifications capture programgenerated actions and/or user-level object accesses on a multimedia window. A coherent effect of these actions requires enforcing deadlines on the event processing over prescribed time intervals. To meet this requirement, the paper advocates an integration of the 'flow of time' as part of the semantics of data presentation on a multimedia window. The paper explores a programming paradigm for event processing: causal ordering of timed messages, to realize multimedia data presentations. This yields simplicity and uniformity in the programming structure of multimedia applications. The presentation specifications in our model can be easily and accurately mapped onto system-level QOS parameters (such as network delays and play-out buffer delays) for scheduling purposes. This in turn may lead to an optimal use of the system resources by a multimedia presentation protocol. The generality of our event-oriented programming interface also allows reducing the multimedia system development costs through software reuse.

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A general-purpose multimedia synchronization mechanism based on causal relations

Cited by 25 publications

References 21 publications

User-assisted tools for concurrency control in distributed multimedia collaborations

User-assisted tools for concurrency control in distributed multimedia collaborations

Control of perceived quality of service in multimedia retrieval services: prediction-based mechanism vs. compensation buffers

Event-Based Programming Structures for Multimedia Information Flows

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