FileSingleVideoSource.cpp

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/*
 *  Copyright (C) Massimo Cora' 2006 <maxcvs@email.it>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */


#include "FileSingleVideoSource.hh"


FileSingleVideoSource::FileSingleVideoSource( char* file_path ) : BaseInputVideo()
{
        _file_path = NULL;

        if ( file_path )
                _file_path = strdup( file_path );

        _initialized = false;
}

FileSingleVideoSource::~FileSingleVideoSource()
{
        if ( _file_path )
                free( _file_path );

        if ( _file_input != NULL )
                cvReleaseCapture( &_file_input );
        _file_input = NULL;
}

bool FileSingleVideoSource::init_device() 
{
        // if already initialized just return it
        if ( _initialized == true )
                return true;

        if ( (_file_input = cvCaptureFromFile( _file_path )) == NULL ) {
                DEBUG_PRINT( "Error initializing file. Are you missing codecs?\n" );
                return false;
        }
        
        _initialized = true;
        return true;
}

IplImage * FileSingleVideoSource::get_next_frame ()
{
        IplImage *tmp_image;
        IplImage *res_image = NULL;

        if ( !_initialized ) {
                // try to initialize the device. If it returns false then we'll return NULL
                if ( init_device () == false )
                        return NULL;
        }

        if( !cvGrabFrame( _file_input )) {
                DEBUG_PRINT( "Error getting frame from file or end of file reached.\n" );
                return NULL;
        }

    tmp_image = cvRetrieveFrame( _file_input );
        
        res_image = cvCreateImage( cvGetSize( tmp_image ), 8, 3 );
        
        // make a copy of the image so that it can be freed later.
        cvCopy( tmp_image, res_image, 0 );

        return res_image;
}


IplImage * FileSingleVideoSource::get_next_frame_by_stream_id( int stream_id ) 
{ 
        return NULL; 
}

void FileSingleVideoSource::add_image_by_stream_id( IplImage *image, int stream_id, 
                                                                                                   char* __unused__, void* callback_data  ) 
{

}

bool FileSingleVideoSource::is_multi_stream () 
{
        return false;
}

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