该程序用于抓取一张yuv格式的图片test-mmap.yuv，存放在/sdcard/test-mmap.yuv路径下。

可以使用附带的软件YUVviewer查看。请设置好width和height。选择合适的YUV Format.-The program used to grab a yuv format images test-mmap.yuv, stored at /sdcard/test-mmap.yuv path. You can use the included software YUVviewer viewing. Please set the width and height. Select the appropriate YUV Format.