Function enum_frame_sizes

rustcv-camera/src/backend/linux/sys.rs:129–141

Enumerate supported frame sizes for a given pixel format (VIDIOC_ENUM_FRAMESIZES). 枚举指定像素格式下支持的帧尺寸（VIDIOC_ENUM_FRAMESIZES）。

(fd: RawFd, pixel_format: u32, index: u32)

/// Enumerate supported frame sizes for a given pixel format (VIDIOC_ENUM_FRAMESIZES).
/// 枚举指定像素格式下支持的帧尺寸（VIDIOC_ENUM_FRAMESIZES）。
pub fn enum_frame_sizes(fd: RawFd, pixel_format: u32, index: u32) -> io::Result<v4l2_frmsizeenum> {
    let mut size: v4l2_frmsizeenum = unsafe { std::mem::zeroed() };
    size.index = index;
    size.pixel_format = pixel_format;
    unsafe {
        v4l2_ioctl(
            fd,
            VIDIOC_ENUM_FRAMESIZES,
            &mut size as *mut _ as *mut libc::c_void,
        )?;
    }
    Ok(size)
}

/// Enumerate supported frame intervals for a given format and size (VIDIOC_ENUM_FRAMEINTERVALS).
/// 枚举指定格式和尺寸下支持的帧间隔（VIDIOC_ENUM_FRAMEINTERVALS）。