Create a /dev/video0 file and write directly into it images

Create a /dev/video0 file and write directly into it images

[Paulo Freitas]

Hi everyone,

I have an Ethernet Camera, from Prosilica, and I need to somehow emulate
this camera in a /dev/video0 file. My idea is, mount a driver file using
'makedev', pick up images from the camera and write them into
the /dev/video0 file. You know how V4L can be used to write images
in /dev/video files? I don't know if it is needed to use makedev
probably not. Any suggestion is welcome.

Thank you for your help.
Best regards, Paulo Freitas.



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Re: Create a /dev/video0 file and write directly into it images

[David Ellingsworth]

On Wed, Sep 16, 2009 at 1:08 PM, Paulo Freitas <paulojlfreitas@sapo.pt> wrote:
> Hi everyone,
>
> I have an Ethernet Camera, from Prosilica, and I need to somehow emulate
> this camera in a /dev/video0 file. My idea is, mount a driver file using
> 'makedev', pick up images from the camera and write them into
> the /dev/video0 file. You know how V4L can be used to write images
> in /dev/video files? I don't know if it is needed to use makedev
> probably not. Any suggestion is welcome.
>
> Thank you for your help.
> Best regards, Paulo Freitas.

Sounds to me like you need a loop back video driver which is capable
of being fed data from a user space application. I don't know if this
patch was ever applied http://patchwork.kernel.org/patch/24370/ but it
seems like something you might be able to use to achieve what you want
to do.

Regards,

David Ellingsworth

P.S. In the future, please post questions to the new mailing list:
linux-media@vger.kernel.org

Re: Create a /dev/video0 file and write directly into it images

[Bill Davidsen]

Paulo Freitas wrote:
> Hi everyone,
> 
> I have an Ethernet Camera, from Prosilica, and I need to somehow emulate
> this camera in a /dev/video0 file. My idea is, mount a driver file using
> 'makedev', pick up images from the camera and write them into
> the /dev/video0 file. You know how V4L can be used to write images
> in /dev/video files? I don't know if it is needed to use makedev
> probably not. Any suggestion is welcome.
> 
I'm not sure I see what the end use is here, watching or recording, but you 
might be able to use existing software which can generate streaming video and 
then use tools which can accept that over a network (could just be loopback if 
that fits your use).

-- 
Bill Davidsen <davidsen@tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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