Re: libv4l release: 0.5.97: the whitebalance release!

[Hans de Goede <hdegoede@redhat.com>]

On 04/17/2009 09:27 PM, Erik Andrén wrote:
>
> Hans de Goede wrote:
>>
>> On 04/16/2009 10:46 PM, Adam Baker wrote:
>>> On Thursday 16 Apr 2009, Hans de Goede wrote:
>>>> On 04/16/2009 12:26 AM, Adam Baker wrote:
>>>>> On Wednesday 15 Apr 2009, Hans de Goede wrote:
>>>>>> Currently only whitebalancing is enabled and only on Pixarts (pac)
>>>>>> webcams (which benefit tremendously from this). To test this with
>>>>>> other
>>>>>> webcams (after instaling this release) do:
>>>>>>
>>>>>> export LIBV4LCONTROL_CONTROLS=15
>>>>>> LD_PRELOAD=/usr/lib/libv4l/v4l2convert.so v4l2ucp&
>>>>> Strangely while those instructions give me a whitebalance control
>>>>> for the
>>>>> sq905 based camera I can't get it to appear for a pac207 based camera
>>>>> regardless of whether LIBV4LCONTROL_CONTROLS is set.
>>>> Thats weird, there is a small bug in the handling of pac207
>>>> cams with usb id 093a:2476 causing libv4l to not automatically
>>>> enable whitebalancing (and the control) for cams with that id,
>>>> but if you have LIBV4LCONTROL_CONTROLS set (exported!) both
>>>> when loading v4l2ucp (you must preload v4l2convert.so!) and
>>>> when loading your viewer, then it should work.
>>>>
>>> I've tested it by plugging in the sq905 camera, verifying the
>>> whitebablance
>>> control is present and working, unplugging the sq905 and plugging in the
>>> pac207 and using up arrow to restart v4l2ucp and svv so I think I've
>>> eliminated most finger trouble possibilities. The pac207 is id
>>> 093a:2460 so
>>> not the problem id. I'll have to investigate more thoroughly later.
>>>
>> Does the pac207 perhaps have a / in its "card" string (see v4l-info
>> output) ?
>> if so try out this patch:
>> http://linuxtv.org/hg/~hgoede/libv4l/rev/1e08d865690a
>>
>
> I have the same issue as Adam when trying to test this with my
> gspca_stv06xx based Quickcam Web camera i. e no whitebalancing
> controls show up. I'm attaching a dump which logs all available
> pixformats and v4l2ctrls showing that libv4l is properly loaded.
> (And yes, LIBV4LCONTROL_CONTROLS is exported and set to 15).
>
> Best regards,
> Erik
>

Ah, you are using v4l2-ctl, not v4l2ucp, and that uses V4L2_CTRL_FLAG_NEXT_CTRL
control enumeration. My code doesn't handle V4L2_CTRL_FLAG_NEXT_CTRL (which is
a bug). I'm not sure when I'll have time to fix this. Patches welcome, or in
the mean time use v4l2ucp to play with the controls.

Regards,

Hans