CaptureClass.cpp

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/***************************************************************************
 *   Copyright (c) Jürgen Riegel          (juergen.riegel@web.de) 2007     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/


#include "PreCompiled.h"
#ifndef _PreComp_
# include <stdio.h>
#endif

#include "CaptureClass.h"

#ifdef _MSC_VER // this file is not available on Linux
//# include <cvcam.h>
#endif 
//---------------------------------------------------------------------------


Capturerer::Capturerer(int num)
: capture(NULL),captureImage(0),_bIsWinOn(false)
{
  capture = cvCaptureFromCAM( num );

  if( !capture )
        throw "Cant create capture device";

    hScale=0.5;
    vScale=0.5;
    lineWidth=1;
    useLabel=true;

    // Init font
    cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX/*|CV_FONT_ITALIC*/, hScale,vScale,0,lineWidth);


}
Capturerer::Capturerer(const char* fileName)
: capture(NULL), captureImage(0),_bIsWinOn(false)
{
   capture = cvCaptureFromAVI( fileName );

   if( !capture )
        throw "Cant create capture device";

}

int Capturerer::chooseCamNum(void)
{
#if 0
    int ncams = cvcamGetCamerasCount( );//returns the number of available cameras in the system
    //printf("Number of Cams: %d\n",ncams);
    int* out;
    if(ncams >1){
        int nselected = cvcamSelectCamera(&out);
        if(nselected>0)
            printf("the 1-st selected camera is camera number %d", out[0]);
        if(nselected == 2)
            printf("the 2-nd selected camera is camera number %d", out[1]);
    }else if (ncams < 1){
        printf("No camara in system! Terminating.\n");
        return -1;
    }else
        out = new int(0);

    return *out;
#else
    //FIXME: cvcamGetCamerasCount is not available on Linux
    return -1;
#endif
}

Capturerer::~Capturerer()
{
        if(_bIsWinOn)
                cvDestroyWindow("Capture");
    if(capture)
        cvReleaseCapture(&capture);
}


void Capturerer::setCaptureWindows(bool On)
{
        if(!_bIsWinOn && On)
        {
                cvNamedWindow( "Capture", 0 );
        _bIsWinOn = true;
        }
        if(_bIsWinOn && !On)
        {
                cvDestroyWindow("Capture");
        _bIsWinOn = false;
        }
}


char Capturerer::getOneCapture(const char *text)
{
    //static int i = 0;
    // Get frame
    IplImage* frame = NULL;
        frame = cvQueryFrame( capture );

    if( !frame )
                throw "Cannot get frame";

    if(! captureImage)
        size = cvGetSize(frame);
        captureImage = cvCreateImage( size, 8, 3 );
    
     // copy memory frame to image
        cvCopy( frame, captureImage, 0 );

    // Flip
        cvFlip(captureImage, captureImage);

    // label
    if (text)
        cvPutText (captureImage,text, cvPoint(0,size.height - 5) , &font, cvScalar(0,255,0));


        if(_bIsWinOn)
          cvShowImage( "Capture", captureImage );

    return cvWaitKey(1);

}