Design Of Video Conversion System Based On SOPC

With the development of multimedia technology, an increasingly powerful video display technology has provided people with high-quality audio-visual enjoyment. Because the video equipment use variety of video interfaces and different types of video interfaces use different standard of video transmission, which makes the presence of different formats of video signal in the video processing field. So the video signal conversion between variety of video interfaces become today’s hot research topic.To date, most commonly used video conversion equipment are based on ARM, DSP, or ASIC architecture design. In terms of scalability, compatibility, flexibility, development cycle, these solutions have their own shortcomings.Following the developing trend and addressing the defects of video conversion technology, the paper proposed a design scheme of video conversion based on SOPC. This scheme based on FPGA is a hardware/software co-design of embedded system. Through the AXI bus and AXI4-Stream bus, the MicroBlaze processor control IP cores to realize video format conversion between different interfaces. This system flexibly reuses IP core resources so as to shorten the development cycle.This system gives full play to the MicroBlaze performance and simplifies hardware circuit, so as to make this design task mainly focusing on the realization of the system function and its algorithm.This design mainly consists of four core subjects:video signal decoding, video format conversion, video b uffer, video output and display. First of all, we use a single chip FPGA to complete construction of the hardware and software platform. Second, we borrow the idea of modular design into effective integration of the four core subject. Video signal decoding module mainly realizes the input HDMI signal decoding and control; Video access and format conversion module adopts three-level pipeline control method to achive effective combination of AXI MPMC controller and AXI Scaler controller so as to improve the work efficiency of the system; Video output and display module mainly realizes the output and display of the transformed signal. Then, in allusion to different modules, we complete the hardware and software design. According to different interface, the hardware design mainly consists of custom IP hardware logic design and VGA hardware circuit design, software design mainly consists of the drivers design of the video decoding module and video access and format conversion module application design. Finally, in allusion to the different modules and the overall design, we make use of the tools such as Modelsim and Chipscope to accomplish simulation and test.Experimental results indicate that the designed system can work normally with stable, reliable performance, and the system can dispay video clearly with uniform color. By using pipeline control method, the design combines video access and format conversion module, and ensures the real-time video output and display. This design has made use of the advantages of SOPC, which makes the system has strong expansibility and portability, so we can effectively solve the application problem of frequent changing video standard.To that end, this design for video conversion study has certain reference value, also has the very good prospects for the application of video conversion.