Constant v4l::v4l2::vidioc::VIDIOC_REQBUFS

pub const VIDIOC_REQBUFS: _IOC_TYPE = ((crate::v4l2::vidioc::_IOC_READ | crate::v4l2::vidioc::_IOC_WRITE) as
     _IOC_TYPE) << crate::v4l2::vidioc::_IOC_DIRSHIFT |
    (b'V' as _IOC_TYPE) << crate::v4l2::vidioc::_IOC_TYPESHIFT |
    (8 as _IOC_TYPE) << crate::v4l2::vidioc::_IOC_NRSHIFT |
    (std::mem::size_of::<v4l2_requestbuffers>() as _IOC_TYPE) <<
        crate::v4l2::vidioc::_IOC_SIZESHIFT; // 3_222_558_216u64