Research On Key Technologies Of Multimedia Cloud Computing Platform

As a new born IT concept, cloud computing is developing rapidly in recent years. Deploying large scale services in cloud is becoming the major trend of IT industry. Moreover, as a result of multimedia technologies'development, many new types of multimedia applications have merged on the Internet, which are already accepted by common people.On the basis of the two points, using cloud for multimedia applications is considered as a new effective serving mode, which also meets the requirement of high computing intensity of multimedia applications. To solve the problem that current cloud computing platform lacks consideration for multimedia applications, in this paper the key technology in a multimedia cloud computing platform has been researched, aiming at solving the problems of deploying multimedia applications in cloud. The main content and achievements can be described as follows:1. In this paper the current cloud computing platforms and multimedia applications have been researched and concluded, which gives a description on the characteristics of modern multimedia applications, and the problems of deploying these applications in the current cloud.2. A novel architecture of multimedia cloud computing platform's network has been proposed in this paper. Aiming at solving the problem of lacking basic support for multimedia application, insufficient consideration for heterogeneous terminals and so on。This architecture uses a no center topology specially designed for the platform. Several key modules and technologies including the content and service oriented DHT management module, the RPC architecture, and the media content aware proxy cache technology are adopted. The experiment results indicate the rationality of platform network architecture design, and the effectiveness of the technologies applied.3. A parallel traffic control mechanism for multimedia cloud computing platform has been proposed to manage the tremendous traffics in the platform effectively. Because cloud computing need to serve different levels of users with different qualities, in this paper HTB is proposed as the basic traffic management module for multimedia cloud, which can both provide service with different levels and make full use of resources. To break the bottleneck of HTB's processing speed and make it capable for cloud computing, the new algorithm of HTB has been designed. As a result, the concurrent region of traditional HTB can be reduced as much as possible, and a novel pipeline-based lock-free parallel HTB can be realized after applying of lock-free FIFOs. The experiments results show that the parallel HTB can make an obvious improvement on the traditional HTB, and keep stability in the mean time. So it is capable for multimedia cloud computing platform.4. A novel parallel DPI mechanism has been proposed in this paper for the real-time security in multimedia cloud computing. To make DPI suitable for cloud computing, it is necessary to solve its problem on stability and speed. So it is analyzed that the main reason for DPI's instability is the length-restricted regular expressions. To solve the problem, a novel algorithm called BSPM has been proposed. Based on this, a parallel DPI mechanism consisting of pre-process module, DFA module and BPSM module has been designed to process different kinds of expressions simultaneously. From the experiment results it is shown that the new mechanism has notable improvement on the stability, and keeps a well performance in processing speed.