rh9 环境下实现linux视频的捕获

http://blog.csdn.net/fengyv/archive/2006/04/28/695616.aspx

rh9 环境下实现linux视频的捕获，并存为bmp格式。
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/****************************************************/ /* */ /* v4lgrab.h */ /* */ /****************************************************/ #ifndef __V4LGRAB_H__ #define __V4LGRAB_H__ #include //typedef enum { FALSE = 0, TRUE = 1, OK = 2} BOOL; //#define SWAP_HL_WORD(x) {(x) = ((x)<<8)>>8);} //#define SWAP_HL_DWORD(x) {(x) = ((x)<<24)>>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; /* #pragma pack(1) typedef struct tagBITMAPFILEHEADER{ WORD bfType; // the flag of bmp, value is "BM" DWORD bfSize; // size BMP file ,unit is bytes DWORD bfReserved; // 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 用来存储数据的空间, size空间大小 void getVideoData(unsigned char *data, int size); #if defined(__cplusplus) } #endif #endif //__V4LGRAB_H___

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

/* */

/* v4lgrab.c */

/* */

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

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include "v4lgrab.h"

#define TRUE 1

#define FALSE 0

#define WIDTHBYTES(i) ((i+31)/32*4)

#define FILE_VIDEO "/dev/video0"

//#define BMP "image.bmp"

#define IMAGEWIDTH 176

#define IMAGEHEIGHT 144

static int fd;

static struct video_capability cap;

static struct video_window win;

static struct video_picture vpic;

int openVideo()

{

//Open video device

fd = open(FILE_VIDEO, O_RDONLY);

if (fd <>

perror(FILE_VIDEO);

return (FALSE);

}

//Get capabilities

if (ioctl(fd, VIDIOCGCAP, &cap) <>

perror("VIDIOGCAP");

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

close(fd);

return (FALSE);

}

//Get the video overlay window

if (ioctl(fd, VIDIOCGWIN, &win) <>

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) <>

perror("VIDIOCGPICT");

close(fd);

return (FALSE);

}

// if (cap.type & VID_TYPE_MONOCHROME) {

// } else {

vpic.depth=24;

vpic.palette=VIDEO_PALETTE_RGB24;

if(ioctl(fd, VIDIOCSPICT, &vpic) <>

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);

}

/*

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() == FALSE) {

return(-1);

}

//Set BITMAPINFOHEADER

bi.biSize = 40;

bi.biWidth = win.width;

bi.biHeight = win.height;

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.bfReserved = 0;

bf.bfOffBits = 54;

buffer = malloc(bi.biSizeImage);

if (!buffer) {

printf("Out of memory.\n");

exit(1);

}

for(i=0; i<20;>

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;

}

*/