Re: libv4l release: 0.5.97: the whitebalance release!

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

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?

Best regards,
Erik


> Regards,
> 
> Hans
>