int v4l_open(char *dev , v4l_device *vd)
{
	if(!dev){
		//dev = “/dev/video0”;
		return -2;
	}
	if((vd->fd=open(dev,O_RDWR))<0) {
		//(“v4l_open:”);
		return -1;
	}
	if(v4l_get_capability(vd))return -1;
	if(v4l_get_picture(vd))return -1;//这两个函数就是即将要完成的获取设备信息的函数
	return 0;
}
Exemple #2
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int v4l_open(char* dev, v4l_device* vd) 
{
	if(!dev)
		dev = DEFAULT_DEVICE;

	if((vd->fd = open(dev, O_RDWR)) < 0) 
	{
		perror("v4l_open: ");
		return -1;
	}

	if(v4l_get_capability(vd)) return -1;
	if(v4l_get_picture(vd)) return -1;

	return 0;
}
Exemple #3
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/*
   norm: VIDEO_MODE_PAL | VIDEO_MODE_NTSC | VIDEO_MODE_SECAM | VIDEO_MODE_AUTO
   (see videodev.h)
*/
int v4l_set_norm(v4l_device *vd, int norm) 
{
   int i;

   for (i = 0; i < vd->capability.channels; i++) {
      vd->channel[i].norm = norm;
      //vd->channel[i].type = VIDEO_TYPE_TV;	//default (VIDEO_TYPE_TV | VIDEO_TYPE_CAMERA)
   }

   if (v4l_get_capability(vd)) {
      perror("v4l_set_norm");
      return -1;
   }
   if (v4l_get_picture(vd)) {
      perror("v4l_set_norm");
   }
   return 0;
}