本文選題：DVB-T系統(tǒng)　切入點：Hi3515編碼器　出處：《電子科技大學(xué)》2014年碩士論文

【摘要】：隨著人們對信息傳輸?shù)男屎头绞接性絹碓絹砀叩囊?視頻作為一種直觀并且易于理解的信息傳播方式被廣泛應(yīng)用于很多領(lǐng)域。DVB-T作為傳統(tǒng)的地面無線視頻廣播傳輸具有成熟、應(yīng)用面廣等優(yōu)勢,但是DVB-T難以與網(wǎng)絡(luò)互聯(lián),特別是目前大量出現(xiàn)的高性能網(wǎng)絡(luò)視頻編碼器與DVB-T調(diào)制器無法直接互聯(lián),無法構(gòu)成更加高效、更經(jīng)濟的視頻終端,因此亟需設(shè)計一種更加高效的視頻傳輸終端。針對DVB-T傳統(tǒng)視頻傳輸終端的不足以及現(xiàn)實的需要,本文設(shè)計并實現(xiàn)了一種基于DVB-T視頻傳輸方式下新的視頻傳輸終端。新的視頻傳輸終端不僅在一個物理信道上能夠傳送多路視頻,而且利用高效率的視頻編碼方案以降低傳輸帶寬。信源端視頻采用比較成熟H.264編碼方法,替代了傳統(tǒng)DVB-T中效率低的MPEG-2編碼方法,并且多路視頻以TS流的形式進行打包和復(fù)用。新的視頻傳輸終端的開發(fā)涉及到嵌入式軟件開發(fā)、FPGA邏輯設(shè)計和硬件電路設(shè)計。視頻編碼及復(fù)用在基于Hi3515的嵌入式Linux下開發(fā)完成,接著利用FPGA完成TS視頻流的處理,最后實現(xiàn)了DVB-T信道調(diào)制板的單板設(shè)計。本文主要完成了以下幾點設(shè)計:1、分析實現(xiàn)了基于Hi3515的多路H.264編碼ES流的TS封裝和復(fù)用。分步實現(xiàn)了H.264編碼ES流到PES流的封裝以及PES流到TS流的封裝過程,實現(xiàn)了多路視頻的TS復(fù)用,在此過程中實現(xiàn)了TS流中各種數(shù)據(jù)的插入以及時間標簽的計算。2、實現(xiàn)了TS視頻流輸出的FPGA處理。本文提出了兩種方案對Hi3515輸出的TS流進行FPGA的實時處理。一種方案是直接利用FPGA接收處理來自Hi3515MII接口的視頻流數(shù)據(jù);另外一種方案是利用FPGA驅(qū)動網(wǎng)卡芯片進行UDP包的接收再處理。FPGA主要完成了網(wǎng)卡驅(qū)動、TS包的過濾、異步FIFO的視頻數(shù)據(jù)讀寫以及TS流的恒碼率匹配輸出等功能。3、設(shè)計并實現(xiàn)了DVB-T信道調(diào)制板。硬件單板以TMS320C6413作為主控芯片,CPLD完成接口和邏輯控制部分的功能,然后配合其余功能芯片完成設(shè)計。硬件單板PCB采用六層板設(shè)計,單板工作穩(wěn)定可靠。4、利用設(shè)計的視頻傳輸終端和已有的DVB-T接收設(shè)備,完成整個DVB-T系統(tǒng)的視頻收發(fā)測試,測試結(jié)果良好。
[Abstract]:With the increasing demands on the efficiency and mode of information transmission, as an intuitive and easy to understand way of information transmission, video has been widely used in many fields. DVB-T as the traditional terrestrial wireless video broadcast transmission has become mature. However, DVB-T is difficult to interconnect with the network, especially the high performance network video encoder and DVB-T modulator can not be directly interconnected, and can not form a more efficient and more economical video terminal. Therefore, it is urgent to design a more efficient video transmission terminal. In this paper, a new video transmission terminal based on DVB-T video transmission mode is designed and implemented. In addition, the high efficiency video coding scheme is used to reduce the transmission bandwidth. The source video adopts more mature H.264 coding method, which replaces the inefficient MPEG-2 coding method in traditional DVB-T. And the multi-channel video is packaged and multiplexed in the form of TS stream. The development of the new video transmission terminal involves the logic design and hardware circuit design of the embedded software development. The video coding and multiplexing is completed under the embedded Linux based on Hi3515. Then using FPGA to complete TS video stream processing, Finally, the single board design of DVB-T channel modulator board is implemented. This paper mainly completes the following design: 1, analyzes and implements the TS encapsulation and multiplexing of multi-channel H.264 encoded es stream based on Hi3515, and realizes the sealing of H.264 encoding es stream to PES stream step by step. Package and package process of PES stream to TS stream, The TS multiplexing of multi-channel video is realized. In this process, the insertion of various data in TS stream and the calculation of time label. 2 are realized, and the FPGA processing of TS video stream output is realized. In this paper, two schemes are proposed for FPGA real-time processing of TS stream output from Hi3515. FPGA is used to receive and process video stream data from Hi3515MII interface directly. Another scheme is to use FPGA driver card chip to receive and reprocess UDP packets. The functions of asynchronous FIFO video data reading and writing and TS stream constant bit rate matching output are as follows. 3. The DVB-T channel modulation board is designed and implemented. The hardware veneer uses TMS320C6413 as the main control chip to complete the interface and logic control functions. Then complete the design with other functional chips. The hardware veneer PCB is designed with six-layer board, and the veneer works stably and reliably. The designed video transmission terminal and the existing DVB-T receiving equipment are used to complete the video transceiver test of the whole DVB-T system. The test results are good.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN919.81

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本文編號：1657022