本文選題：BIT + TORREN�。� 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：進(jìn)入二十一世紀(jì),互聯(lián)網(wǎng)和視頻壓縮等各種技術(shù)的飛速發(fā)展,從網(wǎng)絡(luò)上獲取文字與圖片等靜態(tài)的信息已漸漸不能滿足人們的需求,因此導(dǎo)致音頻、視頻等多媒體信息的需求量在不斷增加。傳統(tǒng)的點(diǎn)播系統(tǒng)大都采用服務(wù)器/客戶機(jī),即C/S模式,服務(wù)器端集中了很多的功能,這說(shuō)明服務(wù)器的性能直接決定了系統(tǒng)的性能。在傳統(tǒng)的點(diǎn)播服務(wù)器中,每一個(gè)用戶單位都對(duì)應(yīng)著一個(gè)服務(wù)器,對(duì)帶寬要求高,且服務(wù)時(shí)間長(zhǎng),當(dāng)用戶數(shù)目不斷增加時(shí),點(diǎn)播服務(wù)器的負(fù)擔(dān)會(huì)變得越來(lái)越重,甚至?xí)䦟?duì)點(diǎn)播體驗(yàn)造成不良的影響,也就是說(shuō),當(dāng)前的大規(guī)模流媒體點(diǎn)播應(yīng)用已完全摒棄了C/S模式點(diǎn)播系統(tǒng)了。在設(shè)計(jì)實(shí)現(xiàn)流媒體點(diǎn)播系統(tǒng)的過(guò)程中,本課題做了如下工作:首先分析現(xiàn)有模式存在的缺陷,提出針對(duì)性的解決方案,并確定系統(tǒng)采用ASP+SQL SERVER2005的技術(shù)組合進(jìn)行開發(fā)。首先,將對(duì)等網(wǎng)絡(luò)(簡(jiǎn)稱P2P網(wǎng)絡(luò))中文件分享的網(wǎng)絡(luò)協(xié)議BITTORRENT協(xié)議(簡(jiǎn)稱BT協(xié)議)進(jìn)行了部分優(yōu)化和改進(jìn),使其成為一個(gè)具有低延遲性、低服務(wù)器負(fù)載性和高連續(xù)度的,可在現(xiàn)有網(wǎng)絡(luò)帶寬上運(yùn)行的流媒體點(diǎn)播系統(tǒng)。對(duì)流媒體流式傳輸技術(shù)從其基礎(chǔ)、傳輸方式、傳輸格式和傳輸協(xié)議等方面進(jìn)行了比較詳細(xì)的敘述,重點(diǎn)介紹了P2P網(wǎng)絡(luò)及BT協(xié)議與流媒體技術(shù)之間的關(guān)系,從理論上分析了基于BT的P2P流媒體點(diǎn)播系統(tǒng)實(shí)現(xiàn)的可行性。其次,按照模塊化的設(shè)計(jì)思想,將視頻點(diǎn)播系統(tǒng)劃分為流媒體服務(wù)器、索引服務(wù)器、WEB服務(wù)器等三個(gè)部分。通過(guò)入口服務(wù)器以網(wǎng)站形式為廣大用戶提供系統(tǒng)界面,用戶可依據(jù)實(shí)際需要在流媒體上訪問(wèn)與播放視頻節(jié)目。流媒體服務(wù)器提供視頻流、儲(chǔ)存視頻節(jié)目、及時(shí)響應(yīng)點(diǎn)播請(qǐng)求、訪問(wèn)控制、信息交互等。索引服務(wù)器接收服務(wù)器端發(fā)送的指令,依據(jù)指令內(nèi)容進(jìn)行相關(guān)操作,結(jié)合實(shí)際情況修改、添加、刪除視頻節(jié)目或者是用戶信息;及時(shí)響應(yīng)服務(wù)器端發(fā)送請(qǐng)求,提高網(wǎng)絡(luò)系統(tǒng)的穩(wěn)定性,使之能夠正常運(yùn)作。本系統(tǒng)的構(gòu)建在一定程度上滿足了點(diǎn)播系統(tǒng)所特有的播放互動(dòng)性和異步性的需求,彌補(bǔ)了當(dāng)前流媒體點(diǎn)播系統(tǒng)的不足之處,如網(wǎng)絡(luò)的異構(gòu)性、節(jié)點(diǎn)選擇、點(diǎn)播系統(tǒng)的實(shí)時(shí)性、片斷選擇和節(jié)點(diǎn)隨機(jī)性等。將BT協(xié)議實(shí)際應(yīng)用到流媒體點(diǎn)播系統(tǒng)中,不僅使網(wǎng)絡(luò)中的空閑資源得到充分利用,提高下載速度,而且還使并發(fā)用戶量增加。但是,本系統(tǒng)在穩(wěn)定性和突發(fā)性事件的處理方面還有待改進(jìn)。
[Abstract]:In the 21 century, with the rapid development of the Internet and video compression and other technologies, the acquisition of static information such as text and pictures from the network has gradually failed to meet the needs of people, thus leading to audio, The demand for multimedia information, such as video, is increasing. The traditional VOD system mostly adopts the server / client mode, that is, the C / S mode, and the server has a lot of functions, which shows that the performance of the server directly determines the performance of the system. In the traditional VOD server, each user unit corresponds to a server, which requires high bandwidth and long service time. When the number of users increases, the burden of VOD server becomes more and more heavy. It may even have a negative impact on the on-demand experience, which means that the current large-scale streaming on-demand applications have completely abandoned the C / S mode of on-demand systems. In the process of designing and implementing the streaming media on-demand system, this paper has done the following work: firstly, the defects of the existing mode are analyzed, and a targeted solution is put forward, and the system is developed with the technical combination of ASP SQL SERVER2005. First of all, the BITTORRENT protocol of file sharing in peer-to-peer (P2P) network is partially optimized and improved to make it a low latency, low server load and high continuity. Streaming media on demand system that can run on the existing network bandwidth. This paper gives a detailed description of streaming media streaming technology in terms of its foundation, transmission mode, transmission format and transmission protocol, and emphasizes on the relationship between P2P network and BT protocol and streaming media technology. The feasibility of P2P streaming media on demand system based on BT is analyzed theoretically. Secondly, according to the modular design idea, the VOD system is divided into three parts: streaming media server, index server and Web server. The user can access and play video programs on streaming media according to the actual need through the portal server to provide the system interface for the vast number of users in the form of website. Streaming media servers provide video streams, store video programs, respond to on-demand requests, access control, information exchange, and so on. The index server receives the instructions sent by the server, carries out relevant operations according to the contents of the instructions, modifies, adds and removes video programs or user information according to the actual situation, responds to the sending requests of the server in a timely manner, Improve the stability of the network system so that it can work properly. To a certain extent, the construction of this system meets the demand of interactive and asynchronous play of VOD system, and makes up for the shortcomings of the current streaming media VOD system, such as the heterogeneity of network, node selection, and the real-time of VOD system. Segment selection and node randomness. The application of BT protocol to streaming media on demand system not only makes full use of the idle resources in the network and improves the download speed, but also increases the number of concurrent users. However, the system needs to be improved in terms of stability and sudden events.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN948.64

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本文編號(hào)：1780799