ENC: How to detect USB camera disconnection?

ENC: How to detect USB camera disconnection?

[Nilo Roberto C Paim]

Hi, all.

 

I've a Vimicro USB cam that I'm constantly pooling for taking snapshots
using an application made by me. How can I programmatically detect when the
cam is disconnected?

 

It seems to me that V4L "thinks" that the cam is still there, even with the
cable disconnected.

 

Any hints?

 

--- >  I'd forgot to say: the driver I'm using is gspca, last version. Works
like a charm. My problem is related to cable's cam disconnected.

 

 

Nilo Roberto C Paim

nilopaim@gmail.com

TinyCOBOL - Equipe de Desenvolvimento 

Porto Alegre - RS - Brasil

 

--
video4linux-list mailing list
Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/video4linux-list

Re: How to detect USB camera disconnection?

[Jean-Francois Moine]

On Thu, 20 Aug 2009 13:54:26 -0300
"Nilo Roberto C Paim" <nilopaim@gmail.com> wrote:

> I've a Vimicro USB cam that I'm constantly pooling for taking
> snapshots using an application made by me. How can I programmatically
> detect when the cam is disconnected?
> 
> It seems to me that V4L "thinks" that the cam is still there, even
> with the cable disconnected.
> 
> --- >  I'd forgot to say: the driver I'm using is gspca, last
> version. Works like a charm. My problem is related to cable's cam
> disconnected.

Hi Nilo,

I don't know how you poll. Normally, when the webcam is disconnected,
the I/O calls should fail with errno = NODEV.

Cheers.

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/

--
video4linux-list mailing list
Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/video4linux-list