分布式內(nèi)容加密分割與調(diào)度策略研究

摘  要

隨著網(wǎng)絡(luò)技術(shù)和數(shù)字視頻壓縮技術(shù)的不斷發(fā)展，使得視頻點(diǎn)播服務(wù)成為可能。一般對(duì)于視頻服務(wù)器的訪問(wèn)是借助于C/S模型，終端用戶在客戶端從服務(wù)器端請(qǐng)求視頻對(duì)象。在分布式環(huán)境中，大量用戶需要通過(guò)中間的通信網(wǎng)絡(luò)同時(shí)存取多個(gè)視頻服務(wù)器。本文論述了一種具有良好擴(kuò)展性的分布式視頻點(diǎn)播系統(tǒng)，它能有效地在較大地域內(nèi)為龐大的用戶群提供點(diǎn)播服務(wù)。
本文提出的分布式視頻點(diǎn)播系統(tǒng)(DVODS)模型，將整個(gè)系統(tǒng)在組織上分為三個(gè)部分：視頻服務(wù)器、管理服務(wù)器和客戶端。這種模型采用中央調(diào)度、多個(gè)視頻服務(wù)器協(xié)同工作的解決方案，能夠適應(yīng)大規(guī)模的視頻點(diǎn)播服務(wù)，不僅可以提高系統(tǒng)的容量，而且可以真正地提高服務(wù)質(zhì)量，減少用戶等待時(shí)間。當(dāng)系統(tǒng)覆蓋地域較大時(shí)，這種方式可以有效地降低系統(tǒng)對(duì)于主干網(wǎng)絡(luò)帶寬的要求，同時(shí)有利于系統(tǒng)的擴(kuò)展和節(jié)目管理。

關(guān)鍵字：分布式視頻點(diǎn)播系統(tǒng)、視頻服務(wù)器、管理服務(wù)器、元數(shù)據(jù)、負(fù)載均衡
 
DISTRIBUTED CONTENT ENCRYPTION SEGMENTATION
AND SCHEDULING STRATEGY RESEARCH

ABSTRACT

Advances in high speed networking technologies and digital compression video techniques have made Video-on-demand services feasible. Access to video servers is commonly done according to a Client/Server model where the user at the client host retrieves video objects from a video server. In a distributed environment, a number of end users may need to access to a number of video servers through one or several communication networks. This paper introduces an advanced model for distributed video-on-demand system, which has a flexible expansibility, scalability and can grow with users’ requirement.
This paper puts forward a new model of DVODS (Distributed Video-on-Demand System), which consists of Video Server, Management Server and Client. This model adopts a new solution scheme of centre scheduling, many video server working together, and it can adopt a large scale of VOD services. This schema improves the capacity of VOD system, decreases the latency time of the users. When the system extends, this method may reduce the bandwidth demand of backbone networks, and in the same time be in favour of system expansion and program management.

KEY WORDS: Video on Demand 、Video Server、 Management Server、Metadata、load balance
 
目錄
摘  要 1
ABSTRACT 2
第一章 緒論 4
1．1 研究背景 4
1．2 視頻點(diǎn)播技術(shù)概述 4
1．3 VOD技術(shù)的發(fā)展現(xiàn)狀及挑戰(zhàn) 5
1．4 論文研究?jī)?nèi)容及目標(biāo) 5
第二章 視頻點(diǎn)播系統(tǒng)及相關(guān)技術(shù) 7
2．1  VOD系統(tǒng)結(jié)構(gòu) 7
2．2 負(fù)載均衡 8
2．3 集中式VOD 8
2．4 分布式VOD 9
2．5 系統(tǒng)框架設(shè)計(jì) 9
2．6 負(fù)載均衡算法實(shí)現(xiàn) 10
2．7 分布式網(wǎng)絡(luò)存儲(chǔ) 11
第三章 分布式VOD視頻系統(tǒng)的實(shí)現(xiàn) 13
3．1 設(shè)計(jì)模型 13
3．2 系統(tǒng)主要部分設(shè)計(jì)與實(shí)現(xiàn) 15
3．3 系統(tǒng)實(shí)現(xiàn)界面 17
參考文獻(xiàn) 21