media/v4l/control.rst

338     struct v4l2_queryctrl queryctrl;
348 	for (querymenu.index = queryctrl.minimum;
349 	     querymenu.index <= queryctrl.maximum;
357     memset(&queryctrl, 0, sizeof(queryctrl));
359     queryctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
360     while (0 == ioctl(fd, VIDIOC_QUERYCTRL, &queryctrl)) {
361 	if (!(queryctrl.flags & V4L2_CTRL_FLAG_DISABLED)) {
362 	    printf("Control %s\\n", queryctrl.name);
364 	    if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
365 	        enumerate_menu(queryctrl.id);
368 	queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
406     memset(&queryctrl, 0, sizeof(queryctrl));
408     for (queryctrl.id = V4L2_CID_BASE;
409 	 queryctrl.id < V4L2_CID_LASTP1;
410 	 queryctrl.id++) {
411 	if (0 == ioctl(fd, VIDIOC_QUERYCTRL, &queryctrl)) {
412 	    if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED)
415 	    printf("Control %s\\n", queryctrl.name);
417 	    if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
418 		enumerate_menu(queryctrl.id);
428     for (queryctrl.id = V4L2_CID_PRIVATE_BASE;;
429 	 queryctrl.id++) {
430 	if (0 == ioctl(fd, VIDIOC_QUERYCTRL, &queryctrl)) {
431 	    if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED)
434 	    printf("Control %s\\n", queryctrl.name);
436 	    if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
437 		enumerate_menu(queryctrl.id);
453     struct v4l2_queryctrl queryctrl;
456     memset(&queryctrl, 0, sizeof(queryctrl));
457     queryctrl.id = V4L2_CID_BRIGHTNESS;
459     if (-1 == ioctl(fd, VIDIOC_QUERYCTRL, &queryctrl)) {
466     } else if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) {
471 	control.value = queryctrl.default_value;