2010-05-06 11:49:30     video settings for display device

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2010-05-06 11:49:30     video settings for display device

Hans Waldmann (UNITED STATES)

Message: 89189   

 

Hi PTG

 

Is there a known linux standard way to set options like: brightness, contrast, saturation, hue -- for a display device like a framebuffer based ADV7171 driver? I see the options are there for the capture device with the video4linux driver. I have not been able to find anything on the display side.

 

Thanks,

 

Hans

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2010-05-06 13:56:39     Re: video settings for display device

Mike Frysinger (UNITED STATES)

Message: 89195   

 

did you make your own fb driver ?  or are you using the existing V4L driver ?  V4L output devices arent typically called "framebuffer drivers" ...

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2010-05-06 14:39:23     Re: video settings for display device

Hans Waldmann (UNITED STATES)

Message: 89198   

 

We are making our own FB driver for the display device.

 

I referred to the video4linux only as a reference. This seems to be used as a video capture device driver. But currently I am mainly interested in the display device.

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2010-05-06 14:58:02     Re: video settings for display device

Mike Frysinger (UNITED STATES)

Message: 89200   

 

V4L is not capture only.  it also supports video output and there does appear to be an ADV7170/ADV7171 driver in there already.

 

the framebuffer API is documented in Documentation/fb/ and linux/fb.h.  but the framebuffer layer is not really designed for things outputting a PAL/NTSC signal which is why you'll find the API "limited" with these types of devices.  that's the point of the V4L layer.

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2010-05-06 17:09:14     Re: video settings for display device

Hans Waldmann (UNITED STATES)

Message: 89201   

 

OK, thanks. I will take a look.

 

Is there are standard linux driver framework for live video capture devices similar to how fb is used for display device?

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2010-05-06 17:12:23     Re: video settings for display device

Mike Frysinger (UNITED STATES)

Message: 89202   

 

V4L does both capturing and output

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