uvc_get_video_ctrl
if (uvc_get_video_ctrl(stream, probe, 1, UVC_GET_DEF) == 0)
ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR);
ret = uvc_get_video_ctrl(stream, &probe_min, 1, UVC_GET_MIN);
ret = uvc_get_video_ctrl(stream, &probe_max, 1, UVC_GET_MAX);
ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR);