基于i.MX21在嵌入式多媒體系統(tǒng)中的研究和開發(fā)
[Abstract]:With the development of economy and the improvement of people's living standard, embedded multimedia technology has been widely used. Such as entertainment, from the initial CD player to MP4 to vehicle entertainment terminal and other products, are typical embedded multimedia technology applications; In addition, with the rapid development of network technology, embedded multimedia transmission technology will have a good application and development prospects. Nowadays, embedded multimedia technology is used to realize the functions of image communication, video surveillance, video on demand and video conference. The purpose of this paper is to research and develop embedded multimedia system based on i.MX21 processor and support embedded Linux system. The method of hardware coding and decoding using MPEG-4 technology standard in embedded multimedia system and the method of realizing multimedia data transmission through real-time transmission protocol (RTP) and real-time transmission control co-RTCP (RTCC) technology are studied in this paper. In the actual research and development process, the following work has been accomplished: (1) the functional requirements, hardware and software architecture and key technologies of the embedded multimedia system, An embedded multimedia system architecture based on i.MX21 is proposed. (2) through the research of the related technology of FFmpeg software and the principle of each hardware module in the platform, combined with the hardware characteristics of the system, In this paper, a method of hardware coding and decoding in FFmpeg software is proposed, and the method is implemented in the actual environment. (3) aiming at the existing MPEG-4 packaging strategy, This paper analyzes two important factors that can be used as the basis for calculating VOP priority, puts forward some improvement measures, and puts forward a concrete calculation method of improved priority. (4) dynamic buffer strategy is discussed. In this paper, a new buffer adjustment strategy is proposed, and the strategy is explained in detail. (5) the frame loss at the receiver is analyzed. Based on the priority packing strategy, the method of frame loss and instant playback is proposed. Finally, the main work of this paper is summarized, the main problems are pointed out, and the basic ideas for improvement are put forward.
【學(xué)位授予單位】:南京理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN919.81
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