YUV422和YUV420格式查看器，对Camera开发人员很有帮助,YUV422 and YUV420 format viewer, very useful for developers Camera

RGB24转yuv420 以及yuv420 planar格式的转yuv420 接口参数简单，实现代码也简单，便于查看，已经测试过-Turn yuv420 RGB24 format and transfer yuv420 yuv420 planar interface parameters is simple, the implementation code is also simple and easy to view, has been tested