hi everybody,
i'am new on the list and iam a newbie
i have a webcam from a co. called Labtec with no
device driver for linux (only windows). now that it is
connected to the usb port a query revealed that :
# cat /proc/bus/usb/devices
output:
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1
Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8
#Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI Root Hub
S: SerialNumber=d000
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00
Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 3
Spd=12 MxCh= 0
D: Ver= 1.10 Cls=ff(vend.) Sub=ff Prot=ff MxPS= 8
#Cfgs= 1
P: Vendor=046d ProdID=0870 Rev= 1.00
S: Product=Camera
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 90mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff
Driver=(none)
E: Ad=81(I) Atr=01(Isoc) MxPS= 0 Ivl= 1ms
E: Ad=82(I) Atr=03(Int.) MxPS= 1 Ivl= 16ms
I: If#= 0 Alt= 1 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff
Driver=(none)
E: Ad=81(I) Atr=01(Isoc) MxPS=1023 Ivl= 1ms
E: Ad=82(I) Atr=03(Int.) MxPS= 1 Ivl= 16ms
So it reveals that the camera has been detected!!
when i unplugged it i couldn't find the Product
=Camera line and the rest of it and thus i beleive it
had been detected.
Now could any one tell me how i can open device
:/dev/video and use the v4l api successfully in
reading frames out of it
because the foll code fails to read :
I know that i need to query and use some ioctl calls
but would that be enough..
main()
{
int fd,n;
char buffer[2056];
fd=open("/dev/video",O_RDONLY);
if(fd < 0)
{
printf("\nCannot open device:\n");
}
while(1)
{
printf("\nRead %d bytes:\n",n);
}
printf("\nCouldnt read\n");
}
open was successfull but cannot read , read returns -1
