Re: prototype of a USB v4l2 driver?

[Hans de Goede <j.w.r.degoede@hhs.nl>]

Andrea wrote:
> Hi,
> 
> I would like to learn more in detail how a video driver works.
> Basically in the last days I've looked at pwc to see why it is not so 
> robust with mplayer.
> I found something in the streaming ioctl calls.
> 
> As an exercise I would like to port it to the "best" and "more elegant" 
> framework, reusing as much as possible the existing v4l2 framework are 
> writing as little code as possible (e.g. using videobuf). And remove all 
> the v4l1 code.
> 
> I would like to know which is the best USB driver to look at.
> Which is the best USB driver that implements videobuf?
> 
> This is a good overview of a driver
> http://lwn.net/Articles/203924/
> 
> I think vivi.c is an other good one.
> 
> Does anybody have any other good reference to look at?
> 

What kind of device, I think that for webcams you;re best using gspca, (now 
merged in mecurial), that handles all the usb specific stuff, buffer 
management, etc. In general it makes it easy to write a webcam driver allowing 
you to focus on the interaction with the cam, rather then having to worry about 
looking, usb specifics, buffer management etc.

Regards,

Hans

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