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硕士计算机专业毕业论文：基于Internet的对等网络流媒体点播系统的研究与实现

背景：

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关键词：对等网络 视频点播 传输调度 覆盖网 Peer-to-Peer VoD streaming scheduling overly network 海口论文 硕士毕业论文

摘  要：对等网络是提供互联网范围内大规模视频应用的关键技术，它成功地克服了传统客户机-服务器模式所面临的可扩展性问题。本文研究对等网络技术流媒体点播系统，在线视频应用分为直播和点播两种，在直播系统中，节点之间相互共享数据的可能性要比点播大得多。由于固有的数据分散性，即海量的视频资源以及节点之间观看视频的进度差异很大，在降低服务器压力和保证节点流畅播放方面，点播比直播面临更大的挑战。其中提出的覆盖网构造算法以及流媒体调度算法为点播系统中存在的这些问题提供了很好的解决方案。
    在分析和研究国内外各种基于对等网络直播和点播系统的基础上，通过对等网络与服务器的融合，提出了新的高效的点播算法，为了评价算法的有效性，文中通过仿真与其它著名算法进行了比较，从而证明了本文所提出的算法可以更加有效地构建流媒体点播系统。文中探讨了一下问题：
1. P2S（Peer-to-Server）与P2P融合，提出了在选片算法中融合P2S和P2P的方法，以支持保证用户服务质量的设计目标。
2. 流媒体调度算法，提出了新的节点选择算法，通过引入“优先级”的指标来从节点服务方的角度选择节点。
3. 覆盖网构造算法，设计出新的基于无结构覆盖网的构造算法，实测数据表明该方法具有很好的稳定性，硕士计算机毕业论文能够适应对等网络动态性的特征。
Abstract

Peer-to-Peer network acts as critical technology for implementing large-scale online video service in Internet, which successfully solved the issue of scalability confronted by traditional client-server pattern. This paper conducts research on the topic of P2P （Peer-to-Peer） VoD （Video-on-Demand） system. Online video service can be generally divided into two categories: live streaming and VoD, and the potential sharing possibilities accounts for much larger in live streaming system than in VoD system. Because of the inherent diversity of data in VoD system, which including a large amount of video resource and the huge difference between progress of the participating nodes, VoD system faces much greater challenges. This paper proposes new overly network algorithm and streaming scheduling algorithm to better solve these problems.
Based on all kinds of live streaming system and VoD system found in literature, this paper proposed new high efficient algorithms by combining P2P network and server. In order to evaluate the efficiency of these algorithms, we compare them with other famous algorithms in international conference, which proves that these algorithms can be used to build more efficient VoD systems. The main contributions are as follows:
1. Combine P2S and P2P in piece picking algorithm in order to provide high quality service to user.
2. Streaming Scheduling Algorithm, propose new peer selection algorithm through introduction of index of priority to select peer from the perspective of serving peer.
3. Overly network construction algorithm, mesh-based overly network construction algorithm is designed, and real-world measurements show that this method has high stability, which can adapt to the dynamics of peer-to-peer network.

目  录

1 序言 1
1.1 研究背景 1
1.2 国内外研究现状 2
1.3 本文结构 6
1.4 本文主要工作 7
2 媒体点播系统体系结构 8
2.1 总体结构 8
2.2 覆盖网构造 12
2.3 流媒体传输调度 15
2.4本章小结 17
3 覆盖网构造算法 19
3.1 功能模块 19
3.1.1 总论 19
3.1.2 功能结构 20
3.1.3 交互流程 21
3.2 节点发现 22
3.2.1功能需求 22
3.2.2算法流程 23
3.3 节点选择 24
3.3.1节点选择的依据 24
3.3.2 算法流程 25
3.3.3 交互机制 26
3.4 算法评价 27
3.5 本章小结 28
4 流媒体调度算法 29
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