My sourcecode for calling camera and geting snapshot

[pcs306]

I hope to call camera directly, preview and then can get snapshot.

#include <sys/ioctl.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>

#include <linux/types.h>
#include <linux/videodev.h>
#include "linux/pxa_camera.h"

int main(int argc, char *argv[]) {

  printf("camdump 0.1\n");

  //atexit(&myexit);
	
	char* buffer;

  struct video_capability cap;
  struct video_picture    pic;
  struct video_window     win;
  
  struct ioctl_data {
                int val1;
                int val2;
        };
  struct ioctl_data io_data;

	int height,width,n,output;
	int videodev = 0;

  // Video-Device starten und konfigurieren
  
  videodev = open("/dev/video0",O_RDONLY);
  if (videodev < 0) { perror("/dev/video0"); exit(1); }

  if (ioctl(videodev,VIDIOCGCAP ,&cap) < 0) { perror("VIDIOCGCAP");  exit(1); }
  if (ioctl(videodev,VIDIOCGPICT,&pic) < 0) { perror("VIDIOCGPICT"); exit(1); }

  width  = 320;//cap.maxwidth;
  height = 240;//cap.maxheight;

  io_data.val1 = CAMERA_IMAGE_FORMAT_YCBCR422_PACKED;
  io_data.val2 = CAMERA_IMAGE_FORMAT_YCBCR422_PACKED;
        if (ioctl(videodev, WCAM_VIDIOCSINFOR, &io_data)) {
                printf("Error setting camera format.\n");
                exit(2);
        }
	printf("name:%s\nwidth:%d\nheight:%d\nformat:%d\n\n",cap.name,cap.maxwidth,cap.maxheight,pic.palette);

	buffer = (char*)malloc(width*height*2);

  if (ioctl(videodev,VIDIOCGWIN,&win) < 0) { perror("VIDIOCGWIN"); exit(1); }
  win.x = win.y = 0; win.width  = width;  win.flags |= (15 << 16);
  win.clipcount = 0; win.height = height; // Framerate  ^^
  if (ioctl(videodev,VIDIOCSWIN,&win) < 0) { perror("VIDIOCSWIN"); exit(1); }

  if (ioctl(videodev,VIDIOCCAPTURE,STILL_IMAGE) < 0) { perror("VIDIOCCAPTURE"); exit(1); }

  n = read(videodev,buffer,width*height*2);

	output = open("out.raw",O_RDWR|O_CREAT|O_TRUNC);
	int i = 0;
/*	for(; i < 320*240; i++)
	{
		
		write( output, buffer+i*2+1,1); 
		
	}
	*/
	write(output,buffer,n);
	close(output);

	close(videodev);
	free(buffer);
	return 0;
}

this program run on E680i, and it can product a file out.raw which supposed to be a picture.but I have found that the file contains many block of "80 00"(view through UltraEditor"). I doubt this is not correct image data.how can I get a picture?please help!
And I still can not preview. I think that it may be have something to do with the last problem. am I right? who can tell me the main steps for preview?

[mserougi]

I don't think it contains any meaningful data cause once you're running the camera application, you're already accessing the device and having another application (your main) access the camera at the same time is not possible I think; it's not supported.

[sandman]

out.raw is the picture in raw image format..i.e., uncompressed, camera-specific image. This can be converted into jpeg or any other image though I do not know how...my sanyo camera can photograph images in raw format (.someother extension) and the software supplied with the camera can convert the raw image...but raw image was almost 2MB while the jpeg image retrieved from it was just 523KB...

So i suppose for this camera type, there will be a way to convert the raw image into some known format..

[pcs306]

@mserougi
I telnet to my E680i and run the program by :
./camdump
so, I think at that time there is only one (my main) program accessing camera.

any body have successfully take a pic through own code?

[mserougi]

Oh I thought you meant you wanted to take a shot with the camera application that came with the phone while running your application at the same time; to like add a shot to your application without writing your own code to handle the camera.

[pnail]

Theres a post (with source - check first page of sticky with subject 'controlling the camera') already to capture the image in YCbCr format (and it works)!

[riteshtonk]

hi,

can you please share the pxa_camera.h and other lib files used to compile the source you posted?
i have a cygwin + crosstool set up and i cannot find the .h file

thanks.

[sabrod]

Hi riteshtonk,
Did you search into the a780 or E680i kernel sources?

[riteshtonk]

hi sabrod,

thx for the reply. I have the kernel sources of a1200 and didnt find the file there. anyways, looking at the code, i realize that the file may not be actually needed.
i just need to replace STILL_IMAGE with constant 1

i managed to compile the code, but when i execute to execute it, I get the following error:
VIDIOCCAPTURE: Cannot allocate memory

any idea what am I doing wrong here?