C++ cvCaptureFromFile函数代码示例

int main (int argc, char **argv)
{
  CvCapture* capture=cvCaptureFromFile(argv[1]);
  
  IplImage * frame;
  IplImage * frameNB;
  char c;
  cvNamedWindow("Exemple video", CV_WINDOW_AUTOSIZE);
  cvNamedWindow("Exemple video NB", CV_WINDOW_AUTOSIZE);
  while(1){
    frame = cvQueryFrame(capture);
    if(frame==NULL){ 
      break;
      printf("Caramba, pas vu pas pris!\n");
    }
    frameNB = cvCreateImage(cvGetSize(frame),IPL_DEPTH_8U,1);
    cvCvtColor(frame, frameNB, CV_BGR2GRAY);
    cvShowImage("Exemple video", frame);
    cvShowImage("Exemple video NB", frameNB);
    c=cvWaitKey(33);/*attente de 33ms*/
    
      if(c==27) break;/* touche esc*/
    cvReleaseImage(&frameNB);
  }
    
  cvReleaseCapture(&capture);
  cvDestroyWindow("Exemple video");
  return(0);
}

int main(){
    
    //initialize
    IplImage *frame;
    CvCapture *video = cvCaptureFromFile("/Users/ihong-gyu/MyProject/OpenCVTest/video.mp4");
    
    //create window
    cvNamedWindow("Video",0);
    
    //show video
    while(1){
        cvGrabFrame(video);
        frame = cvRetrieveFrame(video);
        
        //null checker
        if(!frame)
            break;
        cvShowImage("Video", frame);
        
        //wait key input
        if(cvWaitKey(10)>=0)
            break;
    }
    
    //release memory
    cvReleaseCapture(&video);
    
    
    
    
    return 0;
}

  void VideoCapture::setUpVideo()
  {
    capture = cvCaptureFromFile(videoFileName.c_str());

    if (!capture)
      std::cerr << "Cannot open video file " << videoFileName << std::endl;
  }

bool InitCapture(const char* param)
{
    /*if( param!=NULL || (param==NULL && strlen(param) == 1 && isdigit(param[0])))
        capture = cvCaptureFromCAM( !param ? param[0] - '0' : CV_CAP_ANY );
	 
    else //if( argc == 2 )*/
        capture = cvCaptureFromFile( param ); 

    if( !capture )
    {
        fprintf(stderr,"Could not initialize capturing from %s...\n",param);
        return false;
    }

	// set frame offset
	if (frame_begin>0)
	  if (!cvSetCaptureProperty(capture,CV_CAP_PROP_POS_FRAMES,frame_begin))
	  {
	    printf("Could not start capture from frame %d in %s\n",frame_begin,param);
	    printf(" -> bugfix: fast-forward to the frame %d ...\n",frame_begin);
	    if(capture){
	      int fn=0;
	      while (fn<frame_begin){
		frame = cvQueryFrame( capture );
		if( !frame )
		  break;
		fn++;
	      }
	    }
	    printf("    done.\n");
	    //return false;
	  }
	 
	return true;
}

OpenCVReader::OpenCVReader(list<vector<string> > configList)
{
	int notLoaded = 0;
	int tempCameraInput = 0;
	notLoaded += FindValue(configList, "CVCameraInput", tempCameraInput);
	assert(!notLoaded);
	cameraInput = (tempCameraInput != 0);
	if (!cameraInput)
	{
		notLoaded += FindValue(configList, "CVMovieFileInput", fileName);
		assert(!notLoaded);
		cvImageReader = cvCaptureFromFile(fileName);
	}
	else
	{
		notLoaded += FindValue(configList, "CVCameraNumber", cameraNumber);
		assert(!notLoaded);
		cvImageReader = cvCaptureFromCAM(cameraNumber);
	}
	assert(cvImageReader);
	IplImage* cvImage = cvQueryFrame(cvImageReader);
	assert(cvImage);
	height = cvImage->height;
	width = cvImage->width;
	channels = cvImage->nChannels;
	reset();
	//cout << "Height: " << height << " Width: " << width << " Channels: " << channels << endl;
}

void initialize()
{
//Camera capture and image variables
img=cvCreateImage(cvSize(w,h),8,3);
thresh=cvCreateImage(cvSize(w,h),8,1);


//	capture=cvCreateCameraCapture(1);
	if (movie_id == 1)
	{
		capture=cvCaptureFromFile("GATSBY-1024.mov");
		printf("loading movie_id %d\n", movie_id);
	}
	
// printf("test\n");	
	//Initial capture settings
	
	cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, w);
 	cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, h);
// 	
	//Windows
 	cvNamedWindow("Original",CV_WINDOW_AUTOSIZE);
 	cvNamedWindow("Thresholded",CV_WINDOW_AUTOSIZE);
 	cvNamedWindow("cnt",CV_WINDOW_AUTOSIZE);
	//Creating the sliders
	cvCreateTrackbar("B1","cnt",&b1,255,0);
	cvCreateTrackbar("B2","cnt",&b2,255,0);
	cvCreateTrackbar("G1","cnt",&g1,255,0);
	cvCreateTrackbar("G2","cnt",&g2,255,0);
	cvCreateTrackbar("R1","cnt",&r1,255,0);
	cvCreateTrackbar("R2","cnt",&r2,255,0);
}

/*
 * call-seq:
 *   CvCapture.open(<i>[dev = -1]</i>)
 *
 * Reading video stream from the specified file or camera device.
 * If <i>dev</i> is string (i.e "stream.avi"), reading video stream from file.
 * If <i>dev</i> is number or symbol(include CvCapture::INTERFACE),
 * reading video stream from camera. 
 * Currently two camera interfaces can be used on Windows:
 * * Video for Windows(VFW)
 * * Matrox Imaging Library(MIL)
 * and two on Linux
 * * V4L
 * * FireWire(IEEE1394).
 * If there is only one camera or it does not matter what camera to use <i>nil</i> may be passed.
 */
VALUE
rb_open(int argc, VALUE *argv, VALUE self)
{
  VALUE device;
  rb_scan_args(argc, argv, "01", &device);
  CvCapture *capture = 0;
  try {
    switch (TYPE(device)) {
    case T_STRING:
      capture = cvCaptureFromFile(StringValueCStr(device));
      break;
    case T_FIXNUM:
      capture = cvCaptureFromCAM(FIX2INT(device));
      break;
    case T_SYMBOL: {
      VALUE cap_index = rb_hash_lookup(rb_const_get(rb_class(), rb_intern("INTERFACE")), device);
      if (NIL_P(cap_index))
        rb_raise(rb_eArgError, "undefined interface.");
      capture = cvCaptureFromCAM(NUM2INT(cap_index));
      break;
    }
    case T_NIL:
      capture = cvCaptureFromCAM(CV_CAP_ANY);
      break;
    }
  }
  catch (cv::Exception& e) {
    raise_cverror(e);
  }
  if (!capture)
    rb_raise(rb_eStandardError, "Invalid capture format.");
  return Data_Wrap_Struct(rb_klass, 0, cvcapture_free, capture);
}

int _tmain(int argc, _TCHAR* argv[])
{
	IplImage* pFrame = NULL; 
	CvCapture* pCapture = NULL;

	pCapture = cvCaptureFromFile("synopsis1_cam2_0.avi");
	Cdlbk testModule;

	while(pFrame = cvQueryFrame( pCapture ))
    {
		testModule.Process(pFrame->width, pFrame->height, (unsigned char *)pFrame->imageData);

		//IplImage *bk = cvCreateImage( cvSize(pFrame->width, pFrame->height), IPL_DEPTH_8U, 3 );
		//IplImage *seg = cvCreateImage( cvSize(pFrame->width, pFrame->height), IPL_DEPTH_8U, 1 );
		//memcpy(bk->imageData, testModule.GetBack(), sizeof(uchar)*320*240*3);
		//memcpy(seg->imageData, testModule.GetFore(), sizeof(uchar)*320*240*1);
		//cvShowImage("video", bk);
		//cvShowImage("video1", seg);
		//cvReleaseImage(&bk);
		//cvReleaseImage(&seg);

		//cvShowImage("video", testModule.GetBack());
		//cvShowImage("video", pFrame);
		//如果有按键事件，则跳出循环
		//此等待也为cvShowImage函数提供时间完成显示
		//等待时间可以根据CPU速度调整
		cvWaitKey(10);
		//break;
    }

	cvReleaseCapture(&pCapture);

	return 0;
}

void MyVideo::loadResource(char* folder) {
    //search the folder for images and video
    DIR *dir = NULL;
    dirent *ent = NULL;

    dir = opendir(folder);

    //if the folder is invalid
    if (dir == NULL) {
        cout<<"Invalid folder"<<endl;
        return;
    }

    //get all the files
    while ((ent = readdir(dir)) != NULL) {
        //find the first '.'
        char* suffix = (char*)malloc(sizeof(char));
        sscanf(ent->d_name, "%*[^.]%s", suffix);
        char* input_src = (char*)malloc(sizeof(char));
        strcpy(input_src, folder);
        strcat(input_src, ent->d_name);
        if((strcmp(suffix, ".avi") == 0)&&(ent->d_name[0]!='.')) {
            inputvideo = cvCaptureFromFile(input_src);
        }
        if((strcmp(suffix, ".jpg") == 0)&&(ent->d_name[0]!='.')) {
            IplImage *p = cvLoadImage(input_src, 1);
            images.push_back(p);
        }
    }
    width = (int)cvGetCaptureProperty(inputvideo, 3);
    height = (int)cvGetCaptureProperty(inputvideo, 4);
    fps = (int)cvGetCaptureProperty(inputvideo, 5);
    fourcc = (int)cvGetCaptureProperty(inputvideo, 6);
    framecount = (int)cvGetCaptureProperty(inputvideo, 7);
}

/*
 * call-seq:
 *   CvCapture.open(<i>[dev = -1]</i>)
 *
 * Reading video stream from the specified file or camera device.
 * If <i>dev</i> is string (i.e "stream.avi"), reading video stream from file.
 * If <i>dev</i> is number or symbol(include CvCapture::INTERFACE),
 * reading video stream from camera. 
 * Currently two camera interfaces can be used on Windows:
 * * Video for Windows(VFW)
 * * Matrox Imaging Library(MIL)
 * and two on Linux
 * * V4L
 * * FireWire(IEEE1394).
 * If there is only one camera or it does not matter what camera to use <i>nil</i> may be passed.
 */
VALUE
rb_open(int argc, VALUE *argv, VALUE self)
{
  VALUE device, i;
  rb_scan_args(argc, argv, "01", &device);
  CvCapture *capture = 0;
  switch (TYPE(device)) {
  case T_STRING:
    capture = cvCaptureFromFile(StringValueCStr(device));
    break;
  case T_FIXNUM:
    capture = cvCaptureFromCAM(FIX2INT(device));
    break;
  case T_SYMBOL:    
    i = rb_hash_aref(rb_const_get(rb_class(), rb_intern("INTERFACE")), device);
    if (NIL_P(i))
      rb_raise(rb_eArgError, "undefined interface.");
    capture = cvCaptureFromCAM(NUM2INT(i));
    break;
  case T_NIL:
    capture = cvCaptureFromCAM(CV_CAP_ANY);
    break;
  }
  if (!capture)
    rb_raise(rb_eStandardError, "Invalid capture format.");
  return Data_Wrap_Struct(rb_klass, 0, free, capture);
}

int
main(int argc, char *argv[])
{
    CvCapture *capture = NULL;
    IplImage *src_frame, *image, *dst_frame;
    char *infile, *outfile;
    Matrix matrix;
    Args args;
    int64 t0, t1;
    double tps, deltatime;
    CvVideoWriter *writer;
    CvSize size;
    double fps;
    int frame_count;
    int i;

    infile = argv[1];
    outfile = argv[2];
    args.c = argc - 3;
    for (i = 0; i < 3; i++)
        args.v[i] = argv[i + 3];
    capture = cvCaptureFromFile(infile);
    if (capture == NULL) {
        printf("Could not load video \"%s\".\n", infile);
        return EXIT_FAILURE;
    }
    src_frame = cvQueryFrame(capture);
    fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
    size = cvSize(
        (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH),
        (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT)
    );
    writer = cvCreateVideoWriter(outfile, CV_FOURCC('M', 'J', 'P', 'G'), fps, size, 1);
    printf("Saving to \"%s\"...\n", outfile);
    image = cvCreateImage(size, IPL_DEPTH_8U, 1);
    dst_frame = cvCreateImage(size, IPL_DEPTH_8U, 3);
    matrix.width = dst_frame->width;
    matrix.height = dst_frame->height;
    frame_count = 0;
    t0 = cvGetTickCount();
    while ((src_frame = cvQueryFrame(capture)) != NULL) {
        cvCvtColor(src_frame, image, CV_BGR2GRAY);
        matrix.data = (unsigned char *) image->imageData;
        proc(&matrix, &args);
        cvCvtColor(image, dst_frame, CV_GRAY2BGR);
        cvWriteFrame(writer, dst_frame);
        frame_count++;
    }
    t1 = cvGetTickCount();
    tps = cvGetTickFrequency() * 1.0e6;
    deltatime = (double) (t1 - t0) / tps;
    printf("%d frames of %dx%d processed in %.3f seconds.\n",
           frame_count, dst_frame->width, dst_frame->height,
           deltatime);
    cvReleaseVideoWriter(&writer);
    cvReleaseImage(&dst_frame);
    cvReleaseCapture(&capture);
    return EXIT_SUCCESS;
}

int
main (int argc, char **argv)
{
  CvCapture *capture = 0;
  IplImage *frame = 0;
  CvVideoWriter *writer;
  int c, num = 0;
  //CvFont font;
  //char str[64];

  double fps, width, height;
  if ( argc == 1 || (argc >= 2 && strlen (argv[1]) == 1 && isdigit (argv[1][0])) )
  {
    capture = cvCreateCameraCapture (argc == 2 ? argv[1][0] - '0' : 0);
    fps     = 20.0;
    width   = 320;
    height  = 240;
    //fps     = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
    //cvSetCaptureProperty (capture, CV_CAP_PROP_FRAME_WIDTH, width);
    //cvSetCaptureProperty (capture, CV_CAP_PROP_FRAME_HEIGHT, height);
  }
  else if ( argc >= 2 )
  {
    capture = cvCaptureFromFile(argv[1]);
    fps     = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
    width   = cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);
    height  = cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);
  }
  printf ("fps=%f width=%f height=%f\n", fps, width, height);

  printf ("Write to cap.avi. Finish with Esc.\n");
  // FourCC http://www.fourcc.org/codecs.php
  //writer = cvCreateVideoWriter( "cap.avi", 
  //                              CV_FOURCC('D','I','V','X'),
  //                              fps, cvSize((int)width,(int)height) );
  writer = cvCreateVideoWriter( "cap.avi", -1,
      fps, cvSize((int)width,(int)height) );

  //cvInitFont (&font, CV_FONT_HERSHEY_COMPLEX, 0.7, 0.7);
  cvNamedWindow ("Capture", CV_WINDOW_AUTOSIZE);

  while (1) {
    frame = cvQueryFrame (capture);
    if( frame == NULL ) break;
    //snprintf (str, 64, "%03d[frame]", num);
    //cvPutText (frame, str, cvPoint (10, 20), &font, CV_RGB (0, 255, 100));
    cvWriteFrame (writer, frame);
    cvShowImage ("Capture", frame);
    num++;
    c = cvWaitKey (10);
    if (c == 'q') // exit
      break;
  }
  cvReleaseVideoWriter (&writer);
  cvReleaseCapture (&capture);
  cvDestroyWindow ("Capture");

  return 0;
}

DLLEXPORT frameGrabber::frameGrabber(separ_device_avi_conf_t* an_avi)
{
	this->init_grabber();
	this->avi_conf=an_avi;
	sprintf(this->ss_fname,"%s",an_avi->file);		
	capture = cvCaptureFromFile(this->ss_fname);
	this->frame=new frame_description();
}

int main223(int argc, char* argv[])
{   /* Main function: */
	CvCapture*                  pCap = NULL;
	CvBlobTrackerAutoParam1     param = { 0, 0, 0, 0, 0, 0, 0, 0 };
	CvBlobTrackerAuto*          pTracker = NULL;

	//float       scale = 1;
	const char* scale_name = NULL;
	char*       yml_name = NULL;
	char**      yml_video_names = NULL;
	int         yml_video_num = 0;
	char*       avi_name = NULL;
	const char* fg_name = NULL;
	char*       fgavi_name = NULL;
	char*       btavi_name = NULL;
	const char* bd_name = NULL;
	const char* bt_name = NULL;
	const char* btgen_name = NULL;
	const char* btpp_name = NULL;
	const char* bta_name = NULL;
	char*       bta_data_name = NULL;
	char*       track_name = NULL;
	//char*       comment_name = NULL;
	char*       FGTrainFrames = NULL;
	char*       log_name = NULL;
	char*       savestate_name = NULL;
	char*       loadstate_name = NULL;
	const char* bt_corr = NULL;




	avi_name = "RGB.avi";
	btavi_name = "";
	/* Create source video: */
	if (avi_name)
		pCap = cvCaptureFromFile(avi_name);//打开视频
	//pCap = cvCreateCameraCapture(-1);//从摄像头中读取数据。
	if (pCap == NULL)
	{
		printf("Can't open %s file\n", avi_name);
		return -1;
	}

	//初始化pTracker

	/* Run pipeline: //开始流水线。流水线退出，意味着程序结束，
	这里出错了*/
	//RunBlobTrackingAuto(pCap, pTracker, fgavi_name, btavi_name);

	pTracker = cvCreateBlobTrackerAuto1();
	//pTracker->m_Wnd = 1;
	RunBlobTrackingAuto2323(pCap, pTracker, fgavi_name, btavi_name);


	if (pCap)	cvReleaseCapture(&pCap);
	return 0;
}   /* main() */

void Capture::init(const std::string &filename)
{
    m_capture = cvCaptureFromFile(filename.c_str());
    if ( m_capture == NULL )
    {
        boost::system::error_code errcode;
        throw Exception(boost::format("Can't open file %1%: %2%")
                        % filename % errcode.message());
    }
}