[pwc] capture.c fault

[mahmut gundes <>]

     Hi everybody,


     I am trying to learn fundamentals of v4l2 and capturing. I have looked at sample capture code in V4L2 API specifications' appendix. But there was an error while doing VIDIOC_S_FMT ioctl. The error was "invalid argument". What is the problem at this ioctl command? Is this error just for pwc driver? Thanks for your attention.

capture.c : http://v4l2spec.bytesex.org/v4l2spec/capture.c

:~/usb-pwc/mytest$ ./capture
VIDIOC_S_FMT error 22, Invalid argument


/* VIDIOC_S_FMT ioctl code block is below */

        CLEAR (fmt);

        fmt.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        fmt.fmt.pix.width       = 640; 
        fmt.fmt.pix.height      = 480;
        fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
        fmt.fmt.pix.field       = V4L2_FIELD_INTERLACED;

        if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt))
                errno_exit ("VIDIOC_S_FMT");

        /* Note VIDIOC_S_FMT may change width and height. */

    /* Buggy driver paranoia. */
    min = fmt.fmt.pix.width * 2;
    if (fmt.fmt.pix.bytesperline < min)
        fmt.fmt.pix.bytesperline = min;
    min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
    if (fmt.fmt.pix.sizeimage < min)
        fmt.fmt.pix.sizeimage = min;




Regards, 
Mahmut
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