1 V4L2_CTRL_CLASS_USER 2 V4L2_CTRL_CLASS_MPEG 3 V4L2_CTRL_CLASS_CAMERA 4 V4L2_CTRL_CLASS_FM_TX 5 V4L2_CTRL_CLASS_FLASH 6 V4L2_CTRL_CLASS_JPEG 7 V4L2_CTRL_CLASS_IMAGE_SOURCE 8 V4L2_CTRL_CLASS_IMAGE_PROC 9 V4L2_CTRL_CLASS_FM_RX 10
