Hi George,
On Monday 25 February 2008, George Peter Staplin wrote:
> Quoted Laurent Pinchart <[EMAIL PROTECTED]>:
> > Hi Raúl,
> >
> > On Sunday 24 February 2008, Raúl Sánchez Siles wrote:
> >> Hello All:
> >>
> >> I own a laptop with a webcam supported by the uvc driver. I can use it
> >> for videoconference successfully but I fail to take an single jpg photo.
> >> I use luvcview 0.2.1 in order to have it, with no success.
> >>
> >> I have just built the latest svn driver (r188), with same result. I'm
> >> on a Debian unstable distro using 2.6.24.2 for and Core2 Duo laptop.
> >> This is the output of luvcview:
> >>
> >> luvcview version 0.2.1
> >> Video driver: x11
> >> A window manager is available
> >> video /dev/video0
> >> Unable to set format: 22.
> >> Init v4L2 failed !! exit fatal
> >>
> >> Same result for luvcview -w, -c, -C and -S . -g fails since direct I/O
> >> is not supported.
> >>
> >> What does this message mean? Is there a way I could get a simple
> >> screenshot using the driver. Pointers are appreciated.
> >>
> >> Only -f yuv worked, but well, what about the others?
> >
> > Your camera supports YUV only, so there is no other format :-)
>
> What you may be able to do is use the mjpg-streamer project's
> uvc_stream. The only problem I've had is writing a suitable program
> to work with its somewhat bizarre MJPEG format. Mozilla Firefox will
> display the JPEG frames, although with some bugs, so I wrote my own
> viewer. My viewer supports Linux and Win32. I just share the viewer
> program with my friends so that they can connect to the MJPEG stream.
>
> I also have a small patch to uvc_stream that seems to be useful.
> $ svn diff uvc_stream.c
> Index: uvc_stream.c
> ===================================================================
> --- uvc_stream.c (revision 56)
> +++ uvc_stream.c (working copy)
> @@ -460,8 +460,11 @@
>
> /* create a child for every client that connects */
> while ( 1 ) {
> + struct sockaddr_in saddr;
> + socklen_t slen = sizeof (saddr);
> int *pfd = (int *)calloc(1, sizeof(int));
> - *pfd = accept(sd, 0, 0);
> + *pfd = accept(sd, (struct sockaddr *)&saddr, &slen);
> + fprintf (stderr, "accept %s\n", inet_ntoa (saddr.sin_addr));
> pthread_create(&client, NULL, &client_thread, pfd);
> pthread_detach(client);
>
>
> If desired I could clean it up a bit (it's only ~100 lines of code),
> and add a grab option to save individual frames. It uses code from my
> project called megapkg, specifically the megaimage, jpegext2, and ntk
> extensions to Tcl.
>
> By the way, how difficult would it be to add a read() interface to the
> uvc driver? Is there something that makes that inherently difficult
> that the hardware imposes?
It wouldn't be too difficult. I will try to find some time to implement read()
support, but my motivation isn't as high as it could be as I think the read()
interface was a bad idea in the first place.
Best regards,
Laurent Pinchart
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