Re: libv4l release: 0.5.97: the whitebalance release!

["Erik Andrén" <erik.andren@gmail.com>]

Hans de Goede wrote:
> 
> 
> On 04/19/2009 09:20 PM, Erik Andrén wrote:
>> 2009/4/19 Hans de Goede<hdegoede@redhat.com>:
>>>
>>> On 04/18/2009 04:40 PM, Erik Andrén wrote:
>>>> Hans de Goede wrote:
>>>>> 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.
>>>>>
>>>> Actually, I've tried to use both without finding the controls.
>>>> I've only tried with v4l2ucp v. 1.2. Is 1.3 necessary?
>>>>
>>> Apparently there are different versions of v4l2ucp in different distro's
>>> and some do use the V4L2_CTRL_FLAG_NEXT_CTRL, just like v4l2-ctl. See
>>> Adam Baker's patch later in this thread. Which I will apply to my
>>> tree after I've reviewed it (when I find some time currently I've a
>>> lot of
>>> $work$ )
>>>
>>
>> Applying Adam Bakers patch makes the control appear _but_ I can't seem
>> to make out any difference when any of the whitebalancing and
>> normalize options, regardless of how i tweak the max / min values.
>>
> 
> Did you also do the
> export LIBV4LCONTROL_CONTROLS=15
> 
> In the terminal from where you are starting the viewing application ?
> 

Yes.

> Regards,
> 
> Hans
>