> So the question: is the app actually supposed to loop-query all
> available controls and display each of them? Or is an application
> supposed to use the controls that are known to it, and omit any
> unknown/private controls? Or am I missing something crucial here?
printf("controls\n");
for (i = 0;; i++) {
memset(&qctrl,0,sizeof(qctrl));
qctrl.id = V4L2_CID_BASE+i;
if (-1 == ioctl(fd,VIDIOC_QUERYCTRL,&qctrl))
break;
if (qctrl.flags & V4L2_CTRL_FLAG_DISABLED)
continue;
printf(" VIDIOC_QUERYCTRL(BASE+%d)\n",i);
print_struct(stderr,desc_v4l2_queryctrl,&qctrl,"",tab);
}
for (i = 0;; i++) {
memset(&qctrl,0,sizeof(qctrl));
qctrl.id = V4L2_CID_PRIVATE_BASE+i;
if (-1 == ioctl(fd,VIDIOC_QUERYCTRL,&qctrl))
break;
if (qctrl.flags & V4L2_CTRL_FLAG_DISABLED)
continue;
printf(" VIDIOC_QUERYCTRL(PRIVATE_BASE+%d)\n",i);
print_struct(stderr,desc_v4l2_queryctrl,&qctrl,"",tab);
}
Gerd
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