Re: [Gumstix-users] use other formats from ov3640 camera sensor through the isp pipeline

[Andy W. <an...@si...>]

Hi Tom,

I see you received a response from Laurent on the LMML.  He has much
more knowledge than I on the OMAP ISP linux drivers and media bus.
Guennadi and Hans would also be able to help.

Here was Hans Verkuil's original RFC from Sept 2009 on the media bus:

http://www.spinics.net/lists/linux-media/msg09979.html

Yes, if the format you want to use isn't supported, you will have to add
another format to the kernel and V4L2 API.

The formats in the kernel are the ones added as support for new hardware
was added.

Why isn't the format you want in the kernel?  Either it requires
in-kernel video format conversion in software (which will never be
accepted in the upstream kernel), or no one has ever needed the format
before and submitted patches upstream.
   
Regards,
Andy

On Wed, 2013-12-11 at 04:59 -0800, tom1001 wrote:
> Hello Andy,
> 
> thanks for your reply. By using the sensor with the media pipeline, the ccdc
> output will be set as the video device and the sensor and the ccdc input as
> subdevices. So to change the format on the sonsor I would need to call
> "VIDIOC_SUBDEV_S_FMT". But this call requires a "v4l2_mbus_framefmt" which
> does not contain the pixelformat code which were used in the previous kernel
> versions. So I think I need to add new media busa formats according to the
> pixelformats I want right?
> 
> V4L2_PIX_FMT_UYVY  
> V4L2_PIX_FMT_YUYV
> V4L2_PIX_FMT_YUV444
> V4L2_PIX_FMT_BGR32
>  V4L2_PIX_FMT_RGB555
> V4L2_PIX_FMT_RGB565
> V4L2_PIX_FMT_SBGGR8
> 
> Does someone know why media bus couldn't use the standard pixelformats?
> 
> Regrads, Tom
> 
> 
> 
> --
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