基于 Cortex－M4的 MJPEG 视频解码算法优化

摘要

采用 ARM Cortex-M4处理器内核的 STM32F407ZGT6芯片为硬件平台。读取 SD 卡内的 AVI 视频文件到主存中，通过 MJPEG 视频解码原理对读入缓存中的数据流不断进行解码，利用 DSP 指令和浮点运算对视频解码算法进行优化处理，提高视频解码效率，能在 LCD 屏上正常播放清晰的视频。在 Cortex-M4上实现 MJPEG的视频解码具有很高的性价比，适用于小区、企业视频监控管理。%The hardware platform was achieved based on STM32F407ZGT6 chip with the kernel of ARM Cortex_M4 processor.By reading the AVI format video files in SD into the main memory,using the MJPEG video decoding principle to decrypt data flow which is constantly read into the cache,and the DSP instruction and the function of floating point operations to optimize video decoding algorithm,the study improved the video decoding efficiency.The clear video can be normally played on the LCD screen.The re-alization of MJPEG video decoding in Cortex-M4 presented in this paper is cost-effective,and it is suitable for the video surveillance management of communities and enterprises.