最新的测试版：一个可用于编写v4l2 camera应用程序的库libv4l,里面除有常用的v4l2 ioctl调用的封装API外，还有yuv到rgb转换、rgb到yuv转换和jpeg decoder API。-The latest test version of: an application for writing v4l2 camera library libv4l, which are commonly used in addition to the package v4l2 ioctl