Hi,
2010/12/18 Theodore Kilgore <kilgota@xxxxxxxxxxxxxxxxxxxxxx>:
>
> Does anyone know whether, somewhere in the kernel, there exists a scheme
> for detecting whether the external power supply of the computer is using
> 50hz or 60hz?
>
> The reason I ask:
>
> A certain camera is marketed with Windows software which requests the user
> to set up the option of 50hz or 60hz power during the setup.
>
> Judging by what exists in videodev2.h, for example, it is evidently
> possible to set up this as a control setting in a Linux driver. I am not
> aware of any streaming app which knows how to access such an option.
>
Most uvc cameras present this as a control, so any v4l2 control app
should let you access it.
If your camera driver also supports this control then this shouldn't
be a problem for any generci v4l2 app.
here are a couple of ones:
v4l2ucp (control panel)
guvcview ("guvcview --control_only" will work along side other apps
just like v4l2ucp)
uvcdynctrl from libwebcam for command line control utility .
Regards,
Paulo
> Information about which streaming app ought to be used which could take
> advantage of a setting for line frequency would be welcome, too, of
> course. As I said, I do not know of a single one and would therefore have
> trouble with testing any such control setting unless I could find the
> software which can actually present the choice to the user.
>
> But my main question is whether the kernel already does detect the line
> frequency anywhere else, for whatever reason. For, it occurs to me that a
> far more elegant solution -- if the camera really does need to have the
> line frequency detected -- would be do do the job automatically and not to
> bother the user about such a thing.
>
> In other news, in case anyone has any children who are in love with Lego,
> the "Lego Bionicle" camera which is currently on sale has an SQ905C type
> chip in it. I just added its Product number to the Gphoto driver last
> night. And it works perfectly in webcam mode if one adds its product
> number in gspca/sq905c.c. I will get around to doing that formally, of
> course, when I get time. But if anyone wants just to add the number and
> re-compile the Vendor:Product number for the new camera is 0x2770:0x9051.
>
> Merry Christmas.
>
> Theodore Kilgore
> --
> To unsubscribe from this list: send the line "unsubscribe linux-media" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
