/*
 *  VideoIterator_OpenCV
 *
 *  Author: Andrew Salamon
 *  Date: Tue Feb 27, 2008
 *
 *  Copyright (c) 2008 Machine Perception Laboratory
 *  University of California San Diego.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "openCVImage.h"

#include "VideoIterator_OpenCV.h"

namespace CERT
{

VideoIterator_OpenCV::VideoIterator_OpenCV( const std::string &_path ) : valid(false), path(_path), frame(0), movie(NULL), webcam(false)
{
    if( path.length() > 0 )
        loadVideo();
}

VideoIterator_OpenCV::~VideoIterator_OpenCV()
{
    cvReleaseCapture( &movie );
}

void
VideoIterator_OpenCV::loadVideo()
{
    if( webcam )
        movie = cvCaptureFromCAM( 0 );
    else
        movie = cvCreateFileCapture( path.c_str() );

    if( !movie )
    {
        valid = false;
        return;
    }
    else
    {
        valid = true;
        if( webcam )
        {
            numFrames = 0;
        }
        else
        {
            numFrames = cvGetCaptureProperty( movie, CV_CAP_PROP_FRAME_COUNT );
#ifdef DEBUG
        std::cout << "Video has " << numFrames << " frames." << std::endl;
#endif
        }
    }

    // we start at zero because of the odd way we keep track of frames.
    // The user will see frame numbers starting at 1.
    frame = 0;
}

bool
VideoIterator_OpenCV::nextFrame( RImage<float> &pixels )
{
    if( !valid )
        return false;

//    double frameratio = cvGetCaptureProperty( movie, CV_CAP_PROP_POS_AVI_RATIO );
//    if( (1.0 - frameratio) < 0.000001 )
//    {
//        // end of vid
//        return false;
//    }

    if( !webcam && (frame >= numFrames) )
    {
        return false;
    }

    IplImage *frame_image = NULL;
    frame_image = cvQueryFrame( movie );

    if( !frame_image )
    {
        return false;
    }

    mpt::opencv::Image<float> image;
    image.setOwnCVImage(false);
    image.setCVImage( frame_image ); // this could throw an exception

    pixels = image.getRImage();

    ++frame;

    return true;
}

bool
VideoIterator_OpenCV::isVideo()
{
    return valid;

}

int
VideoIterator_OpenCV::getFrameNumber()
{
    return frame;

}

std::string
VideoIterator_OpenCV::getPath()
{
    return path;
}

void
VideoIterator_OpenCV::setPath( const std::string &_path )
{
    valid = false;
    path = _path;
    frame = 0;

    cvReleaseCapture( &movie );

    if( path.length() > 0 )
        loadVideo();
}

bool
VideoIterator_OpenCV::setUseWebcam( bool useWebcam )
{
    if( webcam != useWebcam )
    {
        webcam = useWebcam;
        setPath( "webcam" ); // reset everything
    }
    return valid;
}

} // End namespace CERT