Unable to initialize camera (via mmap interface)

[Peter Krenesky]

Hi all,

I'm trying to initialize the camera device and running into some 
errors.  I'm attempting to use the mmap interface initialized by 
VIDIOCGMBUF ioctl.  the ioctl is returning -1 and errno is 22. 

Is VIDIOCGMBUF/mmap even supported by the driver/device?   If so, any 
ideas on what can be going wrong?


Here is the c++ code that is causing the problem:

    video_mbuf              mmap_buf_info;
    if (-1 == ioctl(vidfd, VIDIOCGMBUF, &mmap_buf_info))
    {      
        printf ("ERROR: %i \n", errno);
        close();
        return(HXR_ENC_NO_VIDEO_CAPTURE);
    }



thanks,

-peter