(no subject)

Hi,
I have a problem when I change the bpp value, here is the code:

if( ioctl(fbd, FBIOGET_VSCREENINFO, &var_info) == -1){
	perror("\nError IOCTL 1");
	exit(0);
}           
printf("\n bpp: %d", var_info.bits_per_pixel);   // output is  bpp: 16
var_info.bits_per_pixel = 24;
if( ioctl(fbd, FBIOPUT_VSCREENINFO, &var_info) == -1){
	perror("\nError IOCTL 2");
	exit(0);
}           
The program exit with the following message error: 
Error IOCTL 2: Invalid argument

How can I set the bpp value? Should I modify the file /etc/X11/XF86Config?

I have another problem, I try to write a simple program that reads frame from framebuffer and then creates a Divx file of a few seconds.
I map the framebuffer to a buffer, but the program crash with a segmentation fault:
                                                 
    screen_buffer = (char *)malloc(DIM_BUFFER * sizeof(char));
    screen_buffer = (void *)mmap(0, DIM_BUFFER, PROT_READ, MAP_SHARED, fbd, 0);                 
	
    encFrame.image = (void *)screen_buffer;  <--- causes seg fault

What's wrong?  

Thanks,
Paolo Gilardetti
	 




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