Thank you kind sir.
On 10/07/2020 11:28, Hans Verkuil wrote:
On 10/07/2020 16:18, Lucas wrote:
Hello, how do I obtain the accepted range of values for each V4L2_CID
command? Take V4L2_CID_BRIGHTNESS as an example, how do I know what is
the maximum and minimum values accepted for it? I have tried to use
'v4l2_ioctl(fd, VIDIOC_G_CTRL, &query);' thinking that would be stored
in the maximum and minimum members for the struct v4l2_queryctrl but
that does not appear to be the case as the values for those members are
always zero.
Use VIDIOC_QUERYCTRL for that. See:
https://linuxtv.org/downloads/v4l-dvb-apis-new/userspace-api/v4l/vidioc-queryctrl.html
Regards,
Hans
