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编写代码在EVM6446上完成本地视频通过dac口在屏幕上播放



看到网上说可以通过/dev/fb/3实现视频播放,但是知道该怎么具体实现,代码该怎么写,特别是对

fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,中的fbp如何操作,不了解,请指点