* gspca, linux 2.6.26 and ioctl(VIDIOC_QUERYCAP) returning -1, what's wrong?
@ 2008-12-24 16:00 Stefano Sabatini
2008-12-24 16:47 ` Jean-Francois Moine
0 siblings, 1 reply; 3+ messages in thread
From: Stefano Sabatini @ 2008-12-24 16:00 UTC (permalink / raw)
To: video4linux-list Mailing List
Hi all,
I'm using linux 2.6.26 and the Debian gspca module, and I'm getting
ioctl(VIDIOC_QUERYCAP) return -1 after the device is opened.
Do you have any hint to share?
Here there are some relevant informations:
stefano@geppetto ~/s/ffmpeg> uname -a
Linux geppetto 2.6.26-1-686 #1 SMP Sat Oct 18 16:22:25 UTC 2008 i686 GNU/Linux
stefano@geppetto ~/s/ffmpeg> sudo modinfo gspca
filename: /lib/modules/2.6.26-1-686/kernel/drivers/usb/media/gspca.ko
author: Michel Xhaard <mxhaard@users.sourceforge.net> based on spca50x driver by Joel Crisp <cydergoth@users.sourceforge.net>,ov511 driver by Mark McClelland <mwm@i.am>
description: GSPCA/SPCA5XX USB Camera Driver
license: GPL
vermagic: 2.6.26-1-686 SMP mod_unload modversions 686
depends: usbcore,videodev
alias: usb:v093Ap2463d*dc*dsc*dp*ic*isc*ip*
[...]
parm: force_gamma_id:Forced assigning ID of contrast settings (0=default,1,2,3) Zc03xx only (int)
parm: force_sensor_id:Forced assigning ID sensor (Zc03xx only). Dangerous, only for experts !!! (int)
parm: lightfreq:Light frequency banding filter. Set to 50 or 60 Hz, or 0 for NoFlicker (default=50) Zc03xx only (int)
parm: usbgrabber:Is a usb grabber 0x0733:0x0430 ? (default 1) (int)
parm: compress:Turn on/off compression (not functional yet) (int)
parm: GGreen:Gain Green setting range 0 to 512 /256 (int)
parm: GBlue:Gain Blue setting range 0 to 512 /256 (int)
parm: GRed:Gain Red setting range 0 to 512 /256 (int)
parm: OffGreen:OffGreen setting range -128 to 128 (int)
parm: OffBlue:OffBlue setting range -128 to 128 (int)
parm: OffRed:OffRed setting range -128 to 128 (int)
parm: gamma:gamma setting range 0 to 7 3-> gamma=1 (int)
parm: force_rgb:Read RGB instead of BGR (int)
parm: debug:Debug level: 0=none, 1=init/detection, 2=warning, 3=config/control, 4=function call, 5=max (int)
parm: autoexpo:Enable/Disable auto exposure (default=1: enabled) (PC-CAM 600/Zc03xx/spca561a/Etoms Only !!!) (int)
stefano@geppetto ~/s/ffmpeg> dmesg
[...]
[38586.942147] Linux video capture interface: v2.00
[38586.945359] gspca: USB GSPCA camera found.(ZC3XX)
[38586.945359] gspca: [spca5xx_probe:4275] Camera type JPEG
[38587.582486] gspca: [zc3xx_config:669] Find Sensor HV7131R(c)
[38587.586948] gspca: [spca5xx_getcapability:1249] maxw 640 maxh 480 minw 160 minh 120
[38587.586948] usbcore: registered new interface driver gspca
[38587.586948] gspca: gspca driver 01.00.20 registered
[38611.561635] gspca: [spca5xx_set_light_freq:1932] Sensor currently not support light frequency banding filters.
[38611.561740] gspca: [gspca_set_isoc_ep:945] ISO EndPoint found 0x81 AlternateSet 7
[38627.563632] gspca: [spca5xx_set_light_freq:1932] Sensor currently not support light frequency banding filters.
[38627.563726] gspca: [gspca_set_isoc_ep:945] ISO EndPoint found 0x81 AlternateSet 7
[38629.217385] gspca: [spca5xx_do_ioctl:2124] Bridge ZC301-2
[38634.087208] gspca: [spca5xx_set_light_freq:1932] Sensor currently not support light frequency banding filters.
[38634.087208] gspca: [gspca_set_isoc_ep:945] ISO EndPoint found 0x81 AlternateSet 7
The failing application is ffplay (ffplay -s 320x240 -f video4linux2
/dev/video0) if that matters.
Regards.
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* Re: gspca, linux 2.6.26 and ioctl(VIDIOC_QUERYCAP) returning -1, what's wrong?
2008-12-24 16:00 gspca, linux 2.6.26 and ioctl(VIDIOC_QUERYCAP) returning -1, what's wrong? Stefano Sabatini
@ 2008-12-24 16:47 ` Jean-Francois Moine
2008-12-24 17:40 ` Stefano Sabatini
0 siblings, 1 reply; 3+ messages in thread
From: Jean-Francois Moine @ 2008-12-24 16:47 UTC (permalink / raw)
To: Stefano Sabatini; +Cc: video4linux-list Mailing List
On Wed, 2008-12-24 at 17:00 +0100, Stefano Sabatini wrote:
> Hi all,
Hi Stefano,
> I'm using linux 2.6.26 and the Debian gspca module, and I'm getting
> ioctl(VIDIOC_QUERYCAP) return -1 after the device is opened.
[snip]
> stefano@geppetto ~/s/ffmpeg> sudo modinfo gspca
> filename: /lib/modules/2.6.26-1-686/kernel/drivers/usb/media/gspca.ko
> author: Michel Xhaard <mxhaard@users.sourceforge.net> based on spca50x driver by Joel Crisp <cydergoth@users.sourceforge.net>,ov511 driver by Mark McClelland <mwm@i.am>
> description: GSPCA/SPCA5XX USB Camera Driver
[snip]
You use the gspca version 1. This one is obsoleted by the gspca v2 which
is included in the latest linux kernels (>= 2.6.27). You should try the
stable or development versions at LinuxTv.org. Look at my page (see
below) for more information.
Regards.
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Jef | http://moinejf.free.fr/
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* Re: gspca, linux 2.6.26 and ioctl(VIDIOC_QUERYCAP) returning -1, what's wrong?
2008-12-24 16:47 ` Jean-Francois Moine
@ 2008-12-24 17:40 ` Stefano Sabatini
0 siblings, 0 replies; 3+ messages in thread
From: Stefano Sabatini @ 2008-12-24 17:40 UTC (permalink / raw)
To: video4linux-list Mailing List
On date Wednesday 2008-12-24 17:47:04 +0100, Jean-Francois Moine wrote:
> On Wed, 2008-12-24 at 17:00 +0100, Stefano Sabatini wrote:
> > Hi all,
>
> Hi Stefano,
>
> > I'm using linux 2.6.26 and the Debian gspca module, and I'm getting
> > ioctl(VIDIOC_QUERYCAP) return -1 after the device is opened.
> [snip]
> > stefano@geppetto ~/s/ffmpeg> sudo modinfo gspca
> > filename: /lib/modules/2.6.26-1-686/kernel/drivers/usb/media/gspca.ko
> > author: Michel Xhaard <mxhaard@users.sourceforge.net> based on spca50x driver by Joel Crisp <cydergoth@users.sourceforge.net>,ov511 driver by Mark McClelland <mwm@i.am>
> > description: GSPCA/SPCA5XX USB Camera Driver
> [snip]
>
> You use the gspca version 1. This one is obsoleted by the gspca v2 which
> is included in the latest linux kernels (>= 2.6.27). You should try the
> stable or development versions at LinuxTv.org. Look at my page (see
> below) for more information.
Many thanks Jean-Francois,
indeed it was what I suspected, but the line I found in dmesg was misleading:
[38586.942147] Linux video capture interface: v2.00
BTW, would be possible to get a more informative error message from
the module (either in the kernel log either in the strerror string)?,
also I expected to get a different ioctl() code in that case (namely
ENOIOCTLCMD).
Check for example the code in libavdevice/v4l2.c of FFmpeg:
res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
// ENOIOCTLCMD definition only availble on __KERNEL__
if (res < 0 && errno == 515) {
av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
close(fd);
return -1;
}
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
strerror(errno));
close(fd);
return -1;
}
This is supposed to nicely warn the user if the device doesn't support
V4L2.
Is this a problem with V4L* or is the ENOIOCTLCMD assumption wrong?
Again thanks in advance.
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2008-12-24 16:00 gspca, linux 2.6.26 and ioctl(VIDIOC_QUERYCAP) returning -1, what's wrong? Stefano Sabatini
2008-12-24 16:47 ` Jean-Francois Moine
2008-12-24 17:40 ` Stefano Sabatini
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