>int b=1;
>ioctl(fd, VIDIOCCAPTURE, &b);
I think the expected argument is 1 or 0 instead of address for integer b.
try
ioctl(fd, VIDIOCCAPTURE, b);
ioctl(fd, VIDIOCCAPTURE, 1)
--
On 04 Feb 2002 02:29:54 -050
Adam Grossman wrote:
>I have been looking all over for an answer to this, but i can't...
>
>i am trying to just create a simple TV viewer using an overlay. but
>everytime:
>
>
>if (-1 == ioctl(fd, VIDIOCCAPTURE, (int *)&b))
> { perror("capture"); close(fd); exit(1);}
>
>is called i get:
>
>"capture: Invalid argument"
>
>but if i run "xawtv" first, i do not get the error, so i obviously not
>setting something right.
>
>without all the extra code, here is what i am doing:
>
>vidName="/dev/video";
>fd=open(vidName,O_RDWR)
>ioctl(fd,VIDIOCGCAP,&capability)
>
>vc.channel=0;
>strcpy(vc.name,"NTSC");
>vc.tuners=0;
>vc.flags=VIDEO_VC_AUDIO ;
>vc.type = VIDEO_TYPE_TV;
>vc.norm=VIDEO_MODE_NTSC;
>ioctl(fd, VIDIOCSCHAN, &vc);
>
>vw.x=0; vw.y=0;
>vw.width=640; vw.height=480;
>vw.chromakey=1;
>vcl[0].x=0; vcl[0].y=0;
>vcl[0].width=640; vcl[0].height=480;
>vw.clips=vcl;
>vw.clipcount=0;
>ioctl(fd,VIDIOCSWIN,&vw);
>
>vt.tuner=0;
>strcpy(vt.name,"tuner");
>vt.rangelow=55250;
>vt.rangehigh=799250;
>vt.flags=VIDEO_TUNER_NTSC;
>vt.mode=VIDEO_MODE_NTSC;
>vt.signal=32678;
>ioctl(fd, VIDIOCSTUNER, &vt);
>
>unsigned long longfreq=(freq*16)/1000;
>ioctl(fd, VIDIOCSFREQ, &longfreq);
>
>int b=1;
>ioctl(fd, VIDIOCCAPTURE, &b);
>
>thanks for any help,
>-- adam grossman
> aglist (at) metashadow.com
>
>
>
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