From: Lucas <lucasavdantas1992@gmail.com>
To: linux-media@vger.kernel.org
Subject: Range values for V4L2_CID_* commands
Date: Fri, 10 Jul 2020 11:18:37 -0300 [thread overview]
Message-ID: <ab88a3cf-bc05-d43b-dfe2-5f9e78422132@gmail.com> (raw)
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.
Thank you.
next reply other threads:[~2020-07-10 14:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-10 14:18 Lucas [this message]
2020-07-10 14:28 ` Range values for V4L2_CID_* commands Hans Verkuil
2020-07-10 14:36 ` Lucas
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