On 00:00 Wed 17 Oct 2007, Richard Atterer wrote:
> On Tue, Oct 16, 2007 at 08:59:08PM +0200, Laurent Pinchart wrote:
> > Autofocus will never be implemented in the driver but it might be
> > implemented in userspace. This is currently out of scope of the Linux UVC
> > driver project though.
>
> There are two points about implementing autofocus in userspace which I'm
> not sure about:
>
> * An autofocus daemon/program will need to have access to the video stream
> together with the program which uses the webcam. Is this possible? My
> experiments with luvcview and mplayer have failed, the second program
> always appears to get EBUSY.
Yes, this is expected in the V4L2 spec. Only one process can have the
device streaming at any given point. Someone needs to write a daemon
for V4L2 devices to multiplex the frames. Something like PulseAudio for
video.
Brandon
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