Function stream_on

rustcv-camera/src/backend/linux/sys.rs:335–345

Start video streaming (VIDIOC_STREAMON). 启动视频流（VIDIOC_STREAMON）。 All buffers must be queued before calling this. 调用前所有缓冲区必须已入队。

(fd: RawFd)

/// All buffers must be queued before calling this.
/// 调用前所有缓冲区必须已入队。
pub fn stream_on(fd: RawFd) -> io::Result<()> {
    let mut buf_type: u32 = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    unsafe {
        v4l2_ioctl(
            fd,
            VIDIOC_STREAMON,
            &mut buf_type as *mut _ as *mut libc::c_void,
        )?;
    }
    Ok(())
}

/// Stop video streaming (VIDIOC_STREAMOFF).
/// 停止视频流（VIDIOC_STREAMOFF）。