is this the file???
/*********************************************************************
* webcam_server *
* *
* (c) 2002 Donn Morrison [email protected] *
* *
* code used from Gerd Knorr's xawtv (libng) *
* - and - *
* Cory Lueninghoener's gqcam *
* *
* waits for connections from a viewer and sends *
* jpeg encoded captures as a live video feed *
* *
*********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
//#include <linux/time.h>
#include <unistd.h>
#include <semaphore.h>
#include <linux/videodev.h>
#include "webcam_server.h"
#include "camera.h"
#include "image.h"
/*-----------------------------------------------------------
camera procedures
open_cam: attempts to open a camera's device file
close_cam: pretty obvious
get_cam_info/set_cam_info: get/set camera attributes
get_cam_image: get an image from the camera, returns NULL if failed
-----------------------------------------------------------*/
int open_cam(struct caminfo *cam, char *devfile)
{
if(!devfile)
return -1;
/* initialize and open camera */
cam->dev = open(devfile, O_RDONLY);
if(cam->dev < 0)
{
char msg[256];
sprintf(msg, "%s", devfile);
perror(msg);
}
return cam->dev;
}
int close_cam(struct caminfo *cam)
{
return close(cam->dev);
}
int set_cam_info(struct caminfo *cam)
{
if (ioctl (cam->dev, VIDIOCSPICT, &cam->vid_pic) == -1) {
perror ("ioctl (VIDIOCSPICT)");
return -1;
}
if (ioctl (cam->dev, VIDIOCSWIN, &cam->vid_win) == -1) {
perror ("ioctl (VIDIOCSWIN)");
return -1;
}
return 0;
}
void get_cam_info(struct caminfo *cam)
{
if(ioctl(cam->dev, VIDIOCGCAP, &cam->vid_caps) != 0)
{
perror("ioctl (VIDIOCGCAP)");
return;
}
if(ioctl(cam->dev, VIDIOCGWIN, &cam->vid_win) != 0)
{
perror("ioctl (VIDIOCGCAP)");
return;
}
if(ioctl(cam->dev, VIDIOCGPICT, &cam->vid_pic) != 0)
{
perror("ioctl (VIDIOCGCAP)");
return;
}
if(ioctl(cam->dev, VIDIOCGMBUF, &cam->vid_mbuf) == 0)
{
if(!cam->mmap)
cam->mmap = mmap(0, cam->vid_mbuf.size, PROT_READ,
MAP_SHARED, cam->dev, 0);
if(cam->mmap == MAP_FAILED)
cam->o.use_read = 1;
else
{
// cam->o.use_read = 0;
}
}
else
{
cam->o.use_read = 1;
}
}
struct image *get_cam_image(struct caminfo *cam)
{
static struct image *img = NULL;
int len = 0;
if(cam->o.use_read)
{
if(img == NULL)
{
img = image_new(cam->o.width, cam->o.height);
if(img == NULL)
{
perror("malloc: get_cam_image()");
return NULL;
}
}
/* read an image from camera */
len = read(cam->dev, img->buf, img->bufsize);
if(len != img->bufsize)
printf("get_cam_image(): len != img->bufsize, just
letting you know\n");
if(len <= 0)
return NULL;
}
else
{
int res;
img = (struct image*)malloc(sizeof(struct image));
img->width = cam->o.width;
img->height = cam->o.height;
img->bufsize = img->width * img->height * 3;
img->buf = NULL;
cam->vid_v4lmmap.format = cam->pal->val;
cam->vid_v4lmmap.frame = 0;
cam->vid_v4lmmap.width = cam->o.width;
cam->vid_v4lmmap.height = cam->o.height;
/* read an image from camera */
res = ioctl(cam->dev, VIDIOCMCAPTURE, &cam->vid_v4lmmap);
if(res != 0)
return NULL;
res = ioctl(cam->dev, VIDIOCSYNC, &cam->vid_v4lmmap);
if(res != 0)
return NULL;
img->buf = cam->mmap;
}
return img;
}
--
get_cam_image(): len != img->bufsize, just letting you know
https://bugs.launchpad.net/bugs/318187
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