https://github.com/shengkaisun/intelligent_cam/tree/772fe0e4d315f83ba01134389c6b618b1ce40aaf
intelligent_cam/sdk/osd/osd.c
https://github.com/mbin/i2c/tree/0c0ce50686a05a1e1196912a7a5de9d37fbd6e1f/osdtest