Dear UVC developers,
I'm trying to program UVC devices using the video4linux2 API.
I have problems understanding the output UVC driver give for a
VIDIOC_QUERYCTRL ioctl.
Response struct (v4l2_queryctrl):
id: V4L2_CID_EXPOSURE
type: V4L2_CTRL_TYPE_MENU
name: 'Exposure, Auto'
minimum: 0
maximum: 0
step: 9
default_value: 8
flags: 0
The video4linux2 api specification states that, for a Menu type, the meaning
of the queryctrl response given by the driver should be:
min: 0
step: 1
max: N-1
where N is the number of menu choices.
So how should I interpret the UVC response min=0/max=0/step=9???
I got this response for Logitech QuickCam Pro for Notebooks
and
Logitech QuickCam Deluxe for Notebooks
Best regards
and thanks for the great driver ;)
--
Daniele Paganelli
Researcher
Expert System Solutions S.r.l.
Via Virgilio 58/L - 41100 Modena (ITALY)
Tel: +39 0598860020 - Fax: +39 0598860024
Email: [EMAIL PROTECTED]
Web: www.expertsystemsolutions.it
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