V4L2_CTRL_CLASS_JPEG  840 include/uapi/linux/v4l2-controls.h #define V4L2_CID_JPEG_CLASS_BASE		(V4L2_CTRL_CLASS_JPEG | 0x900)
V4L2_CTRL_CLASS_JPEG  841 include/uapi/linux/v4l2-controls.h #define V4L2_CID_JPEG_CLASS			(V4L2_CTRL_CLASS_JPEG | 1)