v4l2_standard     301 include/media/v4l2-ioctl.h extern int v4l2_video_std_construct(struct v4l2_standard *vs,
v4l2_standard    2013 include/uapi/linux/videodev2.h #define VIDIOC_ENUMSTD		_IOWR('V', 25, struct v4l2_standard)