Re: pxa_camera with one buffer don't work

[Guennadi Liakhovetski <g.liakhovetski@xxxxxx>]

On Fri, 2 May 2008, Stefan Herbrechtsmeier wrote:

> Guennadi Liakhovetski schrieb:
> > On Fri, 25 Apr 2008, Stefan Herbrechtsmeier wrote:
> > 
> >   
> > > Hi,
> > > 
> > > is it normal, that the pxa_camera driver don`t work with one buffer?. The
> > > DQBUF blocks if only one buffer is in the query.
> > >     
> > 
> > Well, in v4l2-apps/test/capture_example.c we see:
> > 
> > 	if (req.count < 2) {
> > 		fprintf (stderr, "Insufficient buffer memory on %s\n",
> > 			 dev_name);
> > 		exit (EXIT_FAILURE);
> > 	}
> > 
> > so, they seem to refuse to run with fewer than 2 buffers. But if I remove
> > this restriction and enforce 1 buffer, it works. 2.5 times slower, but
> > works. 
> If I do the same thing, I get a select timeout.

With the same capture_example.c?

> > Can there be a problem with your application? What kernel sources are you
> > using? Try using the latest v4l-dvb/devel git.
> >   
> At the moment I use the kernel 2.6.24 and the V4L kernel modules from
> mercurial.

How new are the modules?

> After I have port my robot platform to the current kernel, I will test it
> again.
> What do you mean by latest v4l-dvb/devel git:
>    git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb.git?

Yes, its "devel" branch.

Thanks
Guennadi
---
Guennadi Liakhovetski

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