v4l_linqijun.c

这是一个通过video4linux的支持

/******************************林启俊_V4L_采集************************************************
****                                      *
***作者: 林启俊                         *      *
***日期:  2006-11-30                 *             *
***                               *                   *
***                             *  ALL RIGHTS Reserved  *
***   
***版本: 1.0                        *                 *
***环境: Linux                         *         *
***                                         *
***目的: 为3G手机的现场直播而准备    
***申明: 一切解释权本人作解释;不得修改(除非经本人同意),不得发表!
***
*** e_mail:   [e-mail]
*******************************************************************************************
***人生格言:   为人生理想而战斗,不怕辛苦!! 为报答父母而奋斗,不怕劳累!!                     ********************

********************************************************************************************
**说明: 此程序尽力让V4L简单而写,采用调用函数来实现;希望对学习V4L的朋友有所帮助                         **********
**     我的摄像头只支持两贞采集,我的想法是,每采集一贞就保存了一个图像;所以我设了两个图像文件           *********
****      /home/linzi.jpeg和/home/linzicheng.jpeg;用的时候可以随便保存到任何地方的                  *******************
***
***   Please email to me if you have some problems or advices to me to modify! than you !!                    ***********/
 



#include "v4l_linqijun.h"


int main(int argc,char **argv)

{   char *address="";
     int frame =0;
      int fd;
 /***********===  Save  the image to the two file =========*************/
   
    FILE *  fp;
    FILE *   FP;

 fp=fopen("/home/linzi.jpeg","w");
 FP=fopen("/home/linzicheng.jpeg","w");


/*******============从这开始====================*************/

   fd=open(DEFAULT,O_RDWR);
  
      if(fd==0)
         printf("open success\n");
     else 
    { printf("open failure and open again\n");
          
         sleep(3);                           //稍等,也许设备没有准备好!
        if((fd=open(DEFAULT1,O_RDWR))<0)
          {   perror(" open devicen");
               
          }
        else printf("open sucess at second time\n");
     }
   
 

   printf("\t\n-------- Go to get capability-----------\n");
    if(lin_get_capability(fd,&capability)==0)
      printf(" \tGET video_capability SUCCESS!\n");
  
  printf("\t\n --------Go to get picture---------------\n");
    
        if(lin_get_picture(fd,&picture)==0)
         printf("\tGET video_picture SUCCESS !\n");
       else    
         perror(" get video_picture!\n");
 
  printf("\t\n--------GO to set picture-----------------\n");
   if(lin_set_picture(fd,&picture)==0)
      printf("SET video_picture SUCCESS !\n");
   else 
      perror(" set video_picture!\n");

   
  printf("\t\n----------GO to set window---------------\n");
  if(lin_set_window(fd,&window)==0)
    
         printf("SET video_window SUCCESS!\n");
  else  
          printf(" SET video_window error!\n");


 printf("\t\n----------------GO to get mbuf-----------------\n");
  if(lin_get_mbuf(fd,&mbuf)==0)
          printf("SET video_mbuf SUCCESS!\n");
  else 
           printf("SET videio_mbuf error\n");

 
printf("\t\n-----------------GO to set mmap----------------\n");
if(lin_set_mmap(&mmap1)==0)                                  
               printf(" SET video_mmap SUCCESS !\n");
  else 
               printf(" SET video_mmap errro\n"); 

 

printf("\t\n----------------GO to memory map----------------\n");
 if(lin_memory_map(fd,mbuf.size)<0)
           printf("memory map failed \n");
 else
           printf(" memory map SUCCESS \n");


printf("\t\n-------------GO TO start capture image----------------\n");
  if(lin_start_capture(fd,&mmap1)==0)
                                                                 
     printf("\t\t grabcapture SUCCESS\n");

  else  
      printf("\t\n startcapture FAIL\n");
  

  fprintf(fp,"P6\n%d %d\n255\n",NTSC_WIDTH,NTSC_HEIGHT);    //jpeg文件的头;
  fprintf(FP,"P6\n%d %d\n255\n",NTSC_WIDTH,NTSC_HEIGHT);
 

 while(frame<mbuf.frames)
  
{
       address=lin_get_mapaddress(frame);
    
     
    if( address==(char *)NULL)
          
        printf(" get mapaddress Failed!\n");
    else   
         printf(" get mapaddress SUCCESS!\n");

   
    if(frame)
          {       printf("\t\n #hehe ! this is the first frame captured here,and saved as /home/lin.jpeg...###\n");
                fwrite(address,NTSC_WIDTH,3*NTSC_HEIGHT,fp);  
          }
    else   {
              printf("\t\n #hehe ! this is the sencond  frame captured here,and saved as /home/linqijun.jpeg...###\n");
             fwrite(address,NTSC_WIDTH,3*NTSC_HEIGHT,FP);  
          }
       frame++;                                                                
    }

return 0;
}