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Re: does a v4l2 test application exist?

You forgot to cc the list, re-adding.

On Mon, 21 Jan 2008, Ram wrote:

> What exactly are you looking for?. You can use that application and
> make neccessary changes to that application.
> 
> There can be no generalised v4l2 video camera app since each camera
> could have different
> ways (ioctls) of controlling and managing them.
> 
> You can write your own application.
> 
> It could include
> 1) Capturing images in different formats that your camera supports (RGB, YUV)
> 2) Testing both the "read" and mmap calls to see if they are working.
> 3) Testing the different capabilities of the camera (ioctls) like
> brightness, contrast, exposure control, white balance, gamma and so
> on.

Sure I can write one. But I was asking if a ready test-application exists. 
The v4l2 API is quite rich, and writing an application, that tests all 
available ioctls, controls, etc. is not a matter of 5 minutes. Therefore, 
I think, it would be good to have a standard application, which one could 
use to test either specific ioctls, or all available ones. But in a bit 
more intelligent was than what ioctl-test.c from the v4l2-apps package. 
Eventually I did use the vcam.c programme from 
http://linux.omap.com/pipermail/linux-omap-open-source/2006-March/006653.html
adding further test cases to it, but it would really be good to have a 
standard test-app, something like what USB developers use to test new host 
controller drivers.

> You could either capture it and store it in a file and view it using a
> Image viewer on a PC (something like YUV tools) or you could capture
> it and dump it on a frame buffer for viewing on a display.

BTW, how can one visualise such a raw buffer caught from a driver, for 
example, in Grey or Bayer format?

Thanks
Guennadi
---
Guennadi Liakhovetski

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