【摘要】：隨著信息技術(shù)迅速發(fā)展,單一的語音媒體技術(shù)已經(jīng)不能滿足人們對通信的要求。據(jù)統(tǒng)計(jì),人類所獲得99%以上的信息都是通過聽覺和視覺獲取的,因此人們也非常希望相互通信過程中能夠包含視頻與語音的交流,必要時(shí)能夠進(jìn)行視音頻信息互傳,直接實(shí)現(xiàn)現(xiàn)場級的信息共享。在這種需求的驅(qū)動(dòng)下,視音頻技術(shù)發(fā)展迅速,并深入應(yīng)用到辦公、教育、商業(yè)、家庭生活、科學(xué)研究等各個(gè)領(lǐng)域。視音頻同步技術(shù)是確保視音頻服務(wù)質(zhì)量的重要手段之一,也是未來多媒體通信研究方向之一；由于視音頻技術(shù)已應(yīng)用到各個(gè)領(lǐng)域,每天產(chǎn)生的視音頻數(shù)據(jù)呈爆炸式趨勢增長,如何快速、高效、安全地存儲視音頻數(shù)據(jù)也成為如今視音頻技術(shù)研究的熱點(diǎn)和面臨的重大挑戰(zhàn)之一。 視音頻同步技術(shù)已廣泛應(yīng)用于各種應(yīng)用平臺,但不同應(yīng)用平臺,其視音頻同步技術(shù)的實(shí)現(xiàn)方式也各不相同,且實(shí)現(xiàn)代碼都經(jīng)過了保密性封裝,視音頻同步的跨平臺應(yīng)用受到了很大的限制。本文首先針對以上不足,提出了一種視音頻同步策略,將系統(tǒng)同步應(yīng)用設(shè)計(jì)分為三個(gè)部分：發(fā)送端同步、網(wǎng)絡(luò)傳輸同步以及接收端同步,并編寫通用的底層硬件驅(qū)動(dòng)軟件,屏蔽底層硬件解碼操作細(xì)節(jié),大大簡化了視音頻同步應(yīng)用軟件的跨平臺應(yīng)用,方便了視音頻同步技術(shù)的實(shí)現(xiàn)。此外,針對某類非常典型的視音頻應(yīng)用系統(tǒng),其特點(diǎn)表現(xiàn)為：存儲文件的數(shù)量龐大,單個(gè)文件的數(shù)據(jù)量較小,數(shù)據(jù)訪問非常頻繁,數(shù)據(jù)存儲空間巨大且較分散等特點(diǎn),提出一種分布式存儲算法,選擇以二叉堆結(jié)構(gòu)組織存儲節(jié)點(diǎn)的信息,結(jié)合網(wǎng)絡(luò)狀況以及CPU利用率兩方面因素確定存儲節(jié)點(diǎn),快速查找出最優(yōu)存儲節(jié)點(diǎn),達(dá)到了充分利用系統(tǒng)存儲空間和快速存取文件的目的。 論文工作中還包含了視音頻同步策略、分布式存儲算法的測試,并詳細(xì)分析了測試數(shù)據(jù)、測試結(jié)果和應(yīng)用系統(tǒng)的性能,結(jié)果表明本文提出的兩種算法均能較好地改善系統(tǒng)的性能,提高系統(tǒng)的運(yùn)行效率。最后,對全文進(jìn)行總結(jié),給出了進(jìn)一步研究的方向和研究重點(diǎn)。
[Abstract]:With the rapid development of information technology, single voice media technology can no longer meet the requirements of communication. According to statistics, more than 99% of the information obtained by human beings is obtained through hearing and vision, so people also very much hope that video and voice communication can be included in the process of mutual communication, and video and audio information can be transmitted to each other if necessary. Direct implementation of field-level information sharing. Driven by this demand, video and audio technology has developed rapidly and has been applied in many fields, such as office, education, business, family life, scientific research and so on. Video and audio synchronization technology is one of the important means to ensure the quality of service of video and audio, and it is also one of the research directions of multimedia communication in the future. Since video and audio technology has been applied to various fields, the daily production of video and audio data shows an explosive trend of growth, how to fast and efficient, Safe storage of video and audio data has become one of the hot topics and major challenges in the field of video and audio technology. Video and audio synchronization technology has been widely used in various application platforms, but different application platforms, their video and audio synchronization technology is also different, and the implementation code has been confidential encapsulation. The cross-platform application of video and audio synchronization has been greatly limited. In this paper, a video and audio synchronization strategy is proposed. The system synchronization application design is divided into three parts: transmitter synchronization, network transmission synchronization and receiver synchronization, and a general hardware driver software is written. Shielding the details of the decoding operation of the underlying hardware greatly simplifies the cross-platform application of the video and audio synchronization application software and facilitates the implementation of the video and audio synchronization technology. In addition, aiming at some kind of very typical video and audio application system, its characteristics are as follows: the number of stored files is huge, the amount of data in a single file is small, the data access is very frequent, the storage space of data is huge and scattered, and so on. In this paper, a distributed storage algorithm is proposed, in which the information of storage nodes is organized with binary heap structure, and the storage nodes are determined according to the two factors of network condition and CPU utilization, and the optimal storage nodes are found quickly. Achieve the full use of the system storage space and fast access to files. The paper also includes the video and audio synchronization strategy, distributed storage algorithm test, and detailed analysis of the test data, test results and the performance of the application system. The results show that the two algorithms proposed in this paper can improve the performance of the system and improve the operating efficiency of the system. Finally, the thesis is summarized, and the direction and emphasis of further research are given.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TP333

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本文編號：2465845