【摘要】：流媒體技術(shù)是一種新型的網(wǎng)絡(luò)媒體傳播技術(shù),區(qū)別于傳統(tǒng)的多媒體,其主要特點是以“音視頻流”的方式進(jìn)行媒體的實時傳送,使人們可以在線觀賞到不間斷的高質(zhì)量畫面。流媒體傳輸作為流媒體的關(guān)鍵技術(shù)之一,傳統(tǒng)上一般采用基于UDP的RTP協(xié)議,而TCP則由于本身需要較多的開銷被認(rèn)為不適合作為實時音頻、視頻傳輸?shù)膮f(xié)議。然而,媒體流的傳送并不是一定不能采用TCP,它只是不適合對話方式的實時媒體流傳送,但是在流媒體服務(wù)器的單向傳送方式下,如果接收端緩沖區(qū)很大且播放時延也可以足夠大,那么是可以使用TCP協(xié)議傳送媒體流的。針對這種情況,論文設(shè)計了基于TCP傳輸?shù)那度胧搅髅襟w播放系統(tǒng)。 論文首先介紹了課題的研究背景及意義,闡述了流媒體技術(shù)的國內(nèi)外發(fā)展現(xiàn)狀。同時介紹了嵌入式流媒體系統(tǒng)的關(guān)鍵技術(shù),詳細(xì)分析了實現(xiàn)這些技術(shù)的不同方法的優(yōu)缺點。然后介紹了本系統(tǒng)的整體設(shè)計框架,并分別描述了各模塊的設(shè)計架構(gòu)。 其次,論文重點介紹了系統(tǒng)的軟件硬件設(shè)計與實現(xiàn)。硬件部分主要是嵌入式終端播放器的硬件選型,選用FL6410開發(fā)板,并對其內(nèi)核ARM11、處理器$3C6410及主要硬件模塊進(jìn)行闡述。軟件部分包括操作系統(tǒng)的選擇、Linux開發(fā)環(huán)境的搭建、嵌入式ARM-Linux系統(tǒng)構(gòu)建、FFmpeg庫的分析、裁剪與移植、各模塊具體功能實現(xiàn)及系統(tǒng)測試等,測試結(jié)果表明系統(tǒng)播放視頻穩(wěn)定流暢,實現(xiàn)了預(yù)期的目標(biāo)。 最后,論文詳細(xì)闡述了系統(tǒng)在數(shù)據(jù)傳輸模塊實現(xiàn)速度控制的方法。
[Abstract]:Streaming media technology is a new type of network media communication technology, which is different from the traditional multimedia technology. Its main characteristic is to transmit the media in real time by "audio and video stream", so that people can enjoy the continuous high quality picture online. Streaming media transmission is one of the key technologies of streaming media. Traditionally, RTP protocol based on UDP is generally adopted, while TCP is considered unsuitable for real-time audio and video transmission because of its own overhead. However, the transmission of media stream is not necessarily the use of TCP,. It is just not suitable for the real-time media transmission mode of dialogue, but under the one-way transmission mode of streaming media server, If the receiver buffer is large and the playback delay is large enough, the TCP protocol can be used to transport the media stream. In view of this situation, the paper designs an embedded streaming media playback system based on TCP transmission. Firstly, the paper introduces the research background and significance of the subject, and expounds the development of streaming media technology at home and abroad. At the same time, the key technologies of embedded streaming media system are introduced, and the advantages and disadvantages of different methods to realize these technologies are analyzed in detail. Then the whole design framework of the system is introduced, and the design framework of each module is described respectively. Secondly, the paper focuses on the software and hardware design and implementation of the system. The hardware part is mainly the hardware selection of the embedded terminal player. The FL6410 development board is selected, and its kernel ARM11, processor $3C6410 and its main hardware modules are described. The software includes the selection of operating system, the construction of Linux development environment, the construction of embedded ARM-Linux system, the analysis of FFmpeg library, the cutting and transplanting, the realization of specific function of each module and the system test, etc. The test results show that the system plays the video steadily and smoothly and achieves the expected goal. Finally, the method of speed control in data transmission module is described in detail.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN946

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