2.5 vidioc_s_fmt_vid_cap函数 设置fmt static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *vf) { struct usb_usbvision *usbvision = video_drvdata(file); int ret; ret = vidioc_try_fmt_vid_cap(file, priv, vf); if (ret) return ret; /* stop io in...