Re: Using MT9P031 digital sensor

[Gary Thomas <gary@mlbassoc.com>]

On 2011-11-08 05:30, Javier Martinez Canillas wrote:
> On Tue, Nov 8, 2011 at 1:20 PM, Gary Thomas<gary@mlbassoc.com>  wrote:
>> On 2011-11-04 04:37, Laurent Pinchart wrote:
>>>
>>> Hi Gary,
>>>
>>> On Tuesday 01 November 2011 19:52:49 Gary Thomas wrote:
>>>>
>>>> I'm trying to use the MT9P031 digital sensor with the Media Controller
>>>> Framework.  media-ctl tells me that the sensor is set to capture using
>>>> SGRBG12  2592x1944
>>>>
>>>> Questions:
>>>> * What pixel format in ffmpeg does this correspond to?
>>>
>>> I don't know if ffmpeg supports Bayer formats. The corresponding fourcc in
>>> V4L2 is BA12.
>>
>> ffmpeg doesn't seem to support these formats
>>
>>>
>>> If your sensor is hooked up to the OMAP3 ISP, you can then configure the
>>> pipeline to include the preview engine and the resizer, and capture YUV
>>> data
>>> at the resizer output.
>>
>> I am using the OMAP3 ISP, but it's a bit unclear to me how to set up the
>> pipeline
>
> Hi Gary,
>
> I'm also using another sensor mtv9034 with OMAP3 ISP, so maybe I can help you.
>
>> using media-ctl (I looked for documentation on this tool, but came up dry -
>> is there any?)
>>
>> Do you have an example of how to configure this using the OMAP3 ISP?
>>
>
> This is how I configure the pipeline to connect the CCDC with the
> Previewer and Resizer:
>
> ./media-ctl -l '"mt9v032 3-005c":0->"OMAP3 ISP CCDC":0[1]'
> ./media-ctl -l '"OMAP3 ISP CCDC":2->"OMAP3 ISP preview":0[1]'
> ./media-ctl -l '"OMAP3 ISP preview":1->"OMAP3 ISP resizer":0[1]'
> ./media-ctl -l '"OMAP3 ISP resizer":1->"OMAP3 ISP resizer output":0[1]'
> ./media-ctl -f '"mt9v032 3-005c":0[SGRBG10 752x480]'
> ./media-ctl -f  '"OMAP3 ISP CCDC":0 [SGRBG10 752x480]'
> ./media-ctl -f  '"OMAP3 ISP CCDC":1 [SGRBG10 752x480]'
> ./media-ctl -f  '"OMAP3 ISP preview":0 [SGRBG10 752x479]'
> ./media-ctl -f  '"OMAP3 ISP resizer":0 [YUYV 734x471]'
> ./media-ctl -f  '"OMAP3 ISP resizer":1 [YUYV 640x480]'
>
> Hope it helps,
>

Thanks, I'll give this a try.

I assume that your sensor is probably larger than 752x480 (the mt9p031
is 2592x1944 raw) and that setting the smaller frame size enables some
scaling and/or cropping in the driver?

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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