제4 장 방과 후 문제 4

       -》    -》   -》  -》            lib  ：

 opencv_imgproc220d.lib opencv_legacy220d.lib opencv_ml220d.lib opencv_core220d.lib opencv_highgui220d.lib opencv_video220d.lib 

// 4-4.cpp :              。
//

#include "stdafx.h"
#include<opencv/cv.h>
#include<opencv/highgui.h>

/*int g_switch_value = 1;
void switch_off_function() {printf("Pause
");}; //YOU COULD DO SOMETHING WITH THESE FUNCTIONS TOO
void switch_on_function() {printf("Run
");}; 


void switch_callback( int position ) {
  if( position == 0 ) 
  {
    switch_off_function();
  } 
  else 
  {
    switch_on_function();
  }
}
 
int main()
{
   IplImage *frame; 
   CvCapture* g_capture  = NULL;
   if(!(g_capture = cvCreateFileCapture("C:\\test.avi")))
   {
   	printf("Failed to open %s
","C:\\test.avi");
   	return -1;
   }

  cvNamedWindow( "SliderControl", 1 );
 
  cvCreateTrackbar(
    "Switch",
    "SliderControl",
    &g_switch_value,
    1,
    switch_callback
  );
 
  while( 1 ) {
    if(g_switch_value)
	{
     frame = cvQueryFrame( g_capture );
   	 if( !frame ) break;
    }
    cvShowImage( "SliderControl", frame);
    if(cvWaitKey(10)==27 ) break;
  }
  
  cvReleaseCapture( &g_capture );
  cvDestroyWindow( "SliderControl" );
  return(0);

}*/
int g_switch_value = 1;
int g_slider_position = 0;
CvCapture* g_capture = NULL;

void onTrackbarSlide(int pos)
{
    cvSetCaptureProperty(g_capture, CV_CAP_PROP_POS_FRAMES,pos);
}

void switch_callback( int position ) {
  if( position == 0 ) 
  {
    printf("Pause
");
  } 
  else 
  {
    printf("on
");
  }
}
int main()
{
    cvNamedWindow("Test Vedio Slide",CV_WINDOW_AUTOSIZE);
	g_capture = cvCreateFileCapture("C:\\test.avi");
    int frames = (int)cvGetCaptureProperty(g_capture,CV_CAP_PROP_FRAME_COUNT);
    int frameRate = (int)cvGetCaptureProperty(g_capture,CV_CAP_PROP_FPS);

    if(frames!=0)
    {
        cvCreateTrackbar( "Switch","Test Vedio Slide",&g_switch_value,1,switch_callback);       
		cvCreateTrackbar("position","Test Vedio Slide", &g_slider_position, frames, onTrackbarSlide);
    }
    IplImage* frame;
   while(g_slider_position<frames)
    {
		if(g_switch_value==1)
		{
        frame = cvQueryFrame(g_capture);
        if(!frame)
            break;
        cvShowImage("Test Vedio Slide", frame);
        char c = cvWaitKey(frameRate);
        cvSetTrackbarPos("position","Test Vedio Slide", g_slider_position);
        onTrackbarSlide(g_slider_position);
        if(c == 27)
            break;
		g_slider_position++;
		}
		else
		{
			if(cvWaitKey(10)==27 ) break;
		}
    }
    cvReleaseCapture(&g_capture);
    cvDestroyWindow("Test Vedio Slide");
}