Re: Asking advice for Camera/ISP driver framework design

[Sakari Ailus <sakari.ailus@iki.fi>]

Cliff Cai wrote:
> Dear guys,

Hi Cliff,

> I'm currently working on a camera/ISP Linux driver project.Of course,I
> want it to be a V4L2 driver,but I got a problem about how to design
> the driver framework.
> let me introduce the background of this ISP(Image signal processor) a
> little bit.
> 1.The ISP has two output paths,first one called main path which is
> used to transfer image data for taking picture and recording,the other
> one called preview path which is used to transfer image data for
> previewing.
> 2.the two paths have the same image data input from sensor,but their
> outputs are different,the output of main path is high quality and
> larger image,while the output of preview path is smaller image.

Is the ISP able to process images which already are in memory, or is
this only from the sensor?

> 3.the two output paths have independent DMA engines used to move image
> data to system memory.
> 
> The problem is currently, the V4L2 framework seems only support one
> buffer queue,and in my case,obviously,two buffer queues are required.
> Any idea/advice for implementing such kind of V4L2 driver? or any
> other better solutions?

Regards,

-- 
Sakari Ailus
sakari.ailus@iki.fi