Ticket #21014: TestCapture.cpp

/*
 *  TestCapture.cpp
 *  OpenCV
 *
 */



#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include <iostream>


using namespace std;

const char  * WINDOW_NAME  = "Playback" ;

int usingCamera; 

int main (int argc, char * const argv[]) 
{       
        int key=0;
        CvCapture* camera = NULL; 
        
        if (argc < 2) {
                cout << "Getting Camera " << CV_CAP_ANY << endl;        
                camera = cvCreateCameraCapture (CV_CAP_ANY);
                usingCamera = 1; 
        } else {
                if (argv[1][0] == '-') {
                        cout << "An simple program to display a video or camera output." << endl << endl
                        << "Usage: " << endl << "    >> TestCapture [optional-path-to-movie-file]" << endl << endl 
                        << "If no optional path to a movie file is provided, attempts to use an attached" << endl 
                        << "    camera for input. Otherwise, attempts to use the movie file for input." << endl << endl; 
                        return 0; 
                }
                cout << "Getting Movie " << argv[1] << endl; 
                camera = cvCreateFileCapture(argv[1]); 
                usingCamera = 0; 
        }
        
    if (! camera) {
                cout << "Failed to get input from a video capture source." << endl << endl
                << "Usage: " << endl << "    >> TestCapture [optional-path-to-movie-file]" << endl << endl 
                << "If no optional path to a movie file is provided, attempts to use an attached" << endl 
                << "    camera for input. Otherwise, attempts to use the movie file for input." << endl << endl; 
                return 0; 
        }
        
    cvNamedWindow (WINDOW_NAME, CV_WINDOW_AUTOSIZE); 
    
    IplImage *  current_frame = cvQueryFrame (camera);
        
        while (key != 'q' && key != 'Q') { //Loop until user enters 'q'
    
                
                current_frame = cvQueryFrame (camera); 
                
                if (current_frame==NULL) { //implies reached camera end
                        cvSetCaptureProperty(camera, CV_CAP_PROP_POS_FRAMES, 0); //reset camera to beginning
                        current_frame = cvQueryFrame (camera) ; 
                        if (current_frame==NULL) //shouldn't happen
                                break; 
                }               
                
                cvShowImage(WINDOW_NAME, current_frame);
        }
        cvReleaseCapture(&camera);
        cvReleaseImage(&current_frame); 
}