Hi Laurent,
thank you for your attention, I enclose as a file the output of "lsusb -v -d 2232:1001" (a bit long).There are nothing (in the execution of my program) printed in "/var/log/messages/". Also, the command "dmesg" gives no additional information ( I run it before executing my program and after it). (anyway, I copy the last lines of dmesg) output:
[ 2909.989414] tun0: Disabled Privacy Extensions [ 2910.281249] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)[ 2910.281749] CONFIG_NF_CT_ACCT is deprecated and will be removed soon. Please use [ 2910.281752] nf_conntrack.acct=1 kernel parameter, acct=1 nf_conntrack module option or
[ 2910.281754] sysctl net.netfilter.nf_conntrack_acct=1 to enable it.[ 2928.462797] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.
BTW, I also enclose the output of my program (called "isabel_video") with debug information activated (which prints all ioctls send to the driver). There is a pretty good bunch of information, but the last grab size change is at line 788 (you can see other previous changes searching for the "setGrabSize" string).
The schema is: VIDIOC_STREAMOFF(mode=1)VIDIOC_REQBUFS (count=0,type=1,memory=1) # CARE HERE: I introduce it because some drivers requires to ask
# for zero buffer to release memory.
# I
found this idea came in the "lucview" program
then, some VIDIOC_ENUM_FRAMESIZES to poll for gram sizes (again),
VIDIOC_G_FMT # get current values
VIDIOC_TRY_FMT # sanity check
VIDIOC_S_FMT # set the new values
finally,
VIDIOC_REQBUFS(count=2,type=1,memory=1)
VIDIOC_QUERYBUF(0, ...
VIDIOC_QBUF(0, ...
VIDIOC_QUERYBUF(1,...
VIDIOC_QBUF(1,...
VIDIOC_STREAMON(mode=1)
and no further evolution... Note that all ioctl return value >= 0 (are ok).
Should you need any further information, or something I can do at my
laptop, just ask for it ,
Thank you very much, Gabriel Huecas On 01/25/2011 04:54 PM, Laurent Pinchart wrote:
Hi Gabriel, On Thursday 20 January 2011 19:11:22 Gabriel Huecas wrote:Dear folks, I have installed Ubuntu Linux in a Samsung SF510, which has a WebCam SCB-0370N (ID 2232:1001)Could you please send me the output of lsusb -v -d 2232:1001 (run as root if possible) ?Whenever I change dynamically the grab size, my video program hangs. The code has been tested in a pretty good bunch of cameras handled by the uvcvideo driver.Does the driver print any message to the kernel log when this happens ?(For example, the Microsoft LifeCam Cinema(TM), or the Logitech "UVC Camera (046d:0994)"- don't remember the product name). Have anyone experience any problem with this camera?
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