Function get_format

rustcv-camera/src/backend/linux/sys.rs:173–180

(fd: RawFd)

/// 获取当前视频格式（VIDIOC_G_FMT）。
#[allow(dead_code)]
pub fn get_format(fd: RawFd) -> io::Result<v4l2_format> {
    let mut fmt: v4l2_format = unsafe { std::mem::zeroed() };
    fmt.type_ = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    unsafe {
        v4l2_ioctl(fd, VIDIOC_G_FMT, &mut fmt as *mut _ as *mut libc::c_void)?;
    }
    Ok(fmt)
}

/// Set the video format (VIDIOC_S_FMT).
/// 设置视频格式（VIDIOC_S_FMT）。