I just wondering how to set shutter or aperture value in uvc driver.

I just wondering how to set shutter or aperture value in uvc driver.

[Kim, HeungJun]

Hi Laurent,

I try to add the more exposure methods of the M-5MOLS driver. Currently,
the only 2 exposure type are available in the M-5MOLS driver -
V4L2_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL. But, the HW is capable to  

So, I found the only UVC driver looks like using extra enumerations
V4L2_EXPOSURE_SHUTTER_PRIORITY, V4L2_EXPOSURE_APERTURE_PRIORITY.
But, I don't know how to set the each value in the each mode.

The way pointed the specific value is only one - V4L2_CID_EXPOSURE_ABSOLUTE.
So, how can I set the specific value at the each mode?


Regards,
Heungjun Kim

Re: I just wondering how to set shutter or aperture value in uvc driver.

[Kim, HeungJun]

missing. sorry :)

2011-05-25 오후 3:49, Kim, HeungJun 쓴 글:
> Hi Laurent,
> 
> I try to add the more exposure methods of the M-5MOLS driver. Currently,
> the only 2 exposure type are available in the M-5MOLS driver -
> V4L2_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL. But, the HW is capable to 

the HW is capable to shutter, aperture exposure value, of course auto exposure. 
 
> 
> So, I found the only UVC driver looks like using extra enumerations
> V4L2_EXPOSURE_SHUTTER_PRIORITY, V4L2_EXPOSURE_APERTURE_PRIORITY.
> But, I don't know how to set the each value in the each mode.
> 
> The way pointed the specific value is only one - V4L2_CID_EXPOSURE_ABSOLUTE.
> So, how can I set the specific value at the each mode?
> 
> 
> Regards,
> Heungjun Kim

Re: I just wondering how to set shutter or aperture value in uvc driver.

[Laurent Pinchart]

Hi Heungjun,

On Wednesday 25 May 2011 08:49:31 Kim, HeungJun wrote:
> Hi Laurent,
> 
> I try to add the more exposure methods of the M-5MOLS driver. Currently,
> the only 2 exposure type are available in the M-5MOLS driver -
> V4L2_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL. But, the HW is capable to shutter,
> aperture exposure value, of course auto exposure.
> So, I found the only UVC driver looks like using extra enumerations
> V4L2_EXPOSURE_SHUTTER_PRIORITY, V4L2_EXPOSURE_APERTURE_PRIORITY.
> But, I don't know how to set the each value in the each mode.
> 
> The way pointed the specific value is only one -
> V4L2_CID_EXPOSURE_ABSOLUTE. So, how can I set the specific value at the
> each mode?

You can control the aperture using the V4L2_CID_IRIS_ABSOLUTE control. See 
http://linuxtv.org/downloads/v4l-dvb-apis/extended-controls.html#camera-
controls for more information regarding the exposure and iris controls.

-- 
Regards,

Laurent Pinchart

Re: I just wondering how to set shutter or aperture value in uvc driver.

[Kim, HeungJun]

Hi Laurent,

2011-05-25 오후 8:17, Laurent Pinchart 쓴 글:
> Hi Heungjun,
> 
> On Wednesday 25 May 2011 08:49:31 Kim, HeungJun wrote:
>> Hi Laurent,
>>
>> I try to add the more exposure methods of the M-5MOLS driver. Currently,
>> the only 2 exposure type are available in the M-5MOLS driver -
>> V4L2_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL. But, the HW is capable to shutter,
>> aperture exposure value, of course auto exposure.
>> So, I found the only UVC driver looks like using extra enumerations
>> V4L2_EXPOSURE_SHUTTER_PRIORITY, V4L2_EXPOSURE_APERTURE_PRIORITY.
>> But, I don't know how to set the each value in the each mode.
>>
>> The way pointed the specific value is only one -
>> V4L2_CID_EXPOSURE_ABSOLUTE. So, how can I set the specific value at the
>> each mode?
> 
> You can control the aperture using the V4L2_CID_IRIS_ABSOLUTE control. See 
> http://linuxtv.org/downloads/v4l-dvb-apis/extended-controls.html#camera-
> controls for more information regarding the exposure and iris controls.
> 
Thanks for response, and I could understand this!
Sorry for pre-checking documents. :)

Regards,
Heungjun Kim