linux下網路攝影機抓圖源碼

                                                          /****************************************************/

/*                                                  */

/*                      v4lgrab.h                   */

/*                                                  */

/****************************************************/

#ifndef __V4LGRAB_H__

#define __V4LGRAB_H__

#define WIDTHBYTES(i)  ((i+31)/32*4)

#include <stdio.h>

//typedef enum { FALSE = 0, TRUE = 1, O67

//#define SWAP_HL_WORD(x) {(x) = ((x)<<8) | ((x)>>8);}

//#define SWAP_HL_DWORD(x) {(x) = ((x)<<24) | ((x)>>24) | (((x)&0xff0000)>>8) | (((x)&0xff00)<<8);}

#define  FREE(x)       if((x)){free((x));(x)=NULL;}

typedef unsigned char  BYTE;

typedef unsigned short WORD;

typedef unsigned long  DWORD;

typedef struct tagBITMAPFILEHEADER{

     WORD bfType;                // the flag of bmp, value is "BM"

     DWORD    bfSize;                // size BMP file ,unit is bytes

     DWORD    bfReserved1;            // 0

     DWORD    bfReserved2;            //0

     DWORD    bfOffBits;             // must be 54

}BITMAPFILEHEADER;

typedef struct tagBITMAPINFOHEADER{

     DWORD    biSize;                // must be 0x28

     DWORD    biWidth;           //

     DWORD    biHeight;          //

     WORD biPlanes;          // must be 1

     WORD biBitCount;            //

     DWORD    biCompression;         //

     DWORD    biSizeImage;       //

     DWORD    biXPelsPerMeter;   //

     DWORD    biYPelsPerMeter;   //

     DWORD    biClrUsed;             //

     DWORD    biClrImportant;        //

}BITMAPINFOHEADER;

typedef struct tagRGBQUAD{

     BYTE    rgbBlue;

     BYTE rgbGreen;

     BYTE rgbRed;

     BYTE rgbReserved;

}RGBQUAD;

#if defined(__cplusplus)

extern "C" {     /* Make sure we have C-declarations in C++ programs */

#endif

//if successful return 1,or else return 0

int openVideo();

int closeVideo();

//data 用來儲存資料的空間, size空間大小

void getVideoData(unsigned char *data, int size);

#if defined(__cplusplus)

}

#endif

#endif //__V4LGRAB_H___

//-------------------------------------------------------------------------------
 
/****************************************************/

/*                                                  */

/*                      v4lgrab.c                   */

/*                                                  */

/****************************************************/

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <stdio.h>

#include <sys/ioctl.h>

#include <stdlib.h>

#include <linux/types.h>

#include <linux/videodev.h>

#include "v4lgrab.h"

#define  TRUE     1

#define  FALSE         0

#define FILE_VIDEO "/dev/video0"

#define  IMAGEWIDTH   640
#define  IMAGEHEIGHT   480

static   int      fd;

static   struct   video_capability   cap;

static   struct   video_window       win;

static   struct   video_picture      vpic;

static   struct   video_mmap      mapbuf;

int openVideo()

{

     //Open video device

  fd = open(FILE_VIDEO, O_RDONLY);

     if (fd < 0) {

         perror(FILE_VIDEO);

         return (FALSE);

     }

     //Get capabilities

     if (ioctl(fd, VIDIOCGCAP, &cap) < 0) {

         perror("VIDIOGCAP");

         printf("(" FILE_VIDEO " not a video4linux device?)\n");

         close(fd);

         return (FALSE);

     }

    printf("devicename -->%s\n",cap.name);
    printf("devicetape -->%d\n",cap.type);
    printf("channels -->%d\n",cap.channels);
    printf("maxwidth -->%d\n",cap.maxwidth);
    printf("maxheith -->%d\n",cap.maxheight);
    printf("minwidth -->%d\n",cap.minwidth);
    printf("minheith -->%d\n",cap.minheight);
   

     //Get the video overlay window

     if (ioctl(fd, VIDIOCGWIN, &win) < 0) {

         perror("VIDIOCGWIN");

         close(fd);

         return (FALSE);

     }

     //Set the video overlay window

     win.width = IMAGEWIDTH;

     win.height = IMAGEHEIGHT;

     if(ioctl(fd, VIDIOCSWIN, &win) <0) {

         perror("VIDIOCSWIN");

         close(fd);

         return (FALSE);;

     }

     //Get picture properties

     if (ioctl(fd, VIDIOCGPICT, &vpic) < 0) {

         perror("VIDIOCGPICT");

         close(fd);

         return (FALSE);

     }

   //mapbuf.width=600;
   //mapbuf.height=480;

   if (cap.type & VID_TYPE_MONOCHROME) {   

   } else {

     vpic.depth=32;
//常用的色彩深度是1位、8位、24位和32位。1位有兩個可能的數值：0或1。較大的色彩深度（每像素資訊的位元更多）意味著數位影像具有較多的可用顏色和較精確的顏色表示
     vpic.palette=VIDEO_PALETTE_RGB24;
     vpic.brightness=5000;//3000-12000比較合適
     vpic.colour=65535;
     vpic.whiteness=65535;//65－65535差別不大
     if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) {

         printf("Unable to find a supported capture format.\n");

         return (FALSE);

     }

}

     return (TRUE);

}

int closeVideo()

{

     if(fd != -1) {

         close(fd);

         return (TRUE);

     }

     return (FALSE);

}

void getVideoData(unsigned char *data, int size)

{

     size = read(fd, data, size);

}

//-------------------------------------------------------------------------------
 
/****************************************************/

/*                                                  */

/*                      temp_get.c                   */

/*                                                  */

/****************************************************/

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <linux/types.h>
#include <linux/videodev.h>
#include "v4lgrab.h"

#define BMP      "image2.bmp"

#define  IMAGEWIDTH    640
#define  IMAGEHEIGHT  480

int main(int argc, char ** argv)

{

     FILE *             fp;

     BITMAPFILEHEADER   bf;

     BITMAPINFOHEADER   bi;
   
     unsigned char *        buffer;

     int           i;

     fp = fopen(BMP, "wb");
   
     if(!fp){

         perror(BMP);
         exit(1);

     }
    
   
     if(openVideo() == -1) {

         return(-1);

     }

     //Set BITMAPINFOHEADER

     bi.biSize = 40;

     bi.biWidth = IMAGEWIDTH;

     bi.biHeight = IMAGEHEIGHT;

     bi.biPlanes = 1;

     bi.biBitCount = 24;

     bi.biCompression = 0;

     bi.biSizeImage = WIDTHBYTES(bi.biWidth * bi.biBitCount) * bi.biHeight;

     bi.biXPelsPerMeter = 0;

     bi.biYPelsPerMeter = 0;

     bi.biClrUsed = 0;

     bi.biClrImportant = 0;

     //Set BITMAPFILEHEADER

     bf.bfType = 0x4d42;

     bf.bfSize = 54 + bi.biSizeImage;

     bf.bfReserved1 = 0;

     bf.bfReserved2 = 0;

     bf.bfOffBits = 54;

     buffer = malloc(bi.biSizeImage);

     if (!buffer) {

         printf("Out of memory.\n");

         exit(1);

     }

     for(i=0; i<20; i++)

         getVideoData(buffer, bi.biSizeImage);

     fwrite(&bf, 14, 1, fp);

     fwrite(&bi, 40, 1, fp);

     fwrite(buffer, bi.biSizeImage, 1, fp);

     printf("get bmp form video\t[OK]\n");

     fclose(fp);

     closeVideo();

     return 0;

}

//------------------------------------------------------------------------------
網上摘錄下來的,經過了調試修改.在gcc4.1   arm-linux-gcc-3.4.1  編譯通過.
在s3c2410   pc上可以正常運行.