cvd/timeddiskbuffer.h

/*
    This file is part of the CVD Library.

    Copyright (C) 2005 The Authors

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#ifndef TIMEDDISKBUFFER_H
#define TIMEDDISKBUFFER_H

#include <cvd/diskbuffer2.h>

namespace CVD {

    namespace Exceptions
    {
        namespace TimedDiskBuffer
        {
            struct All: public CVD::Exceptions::VideoBuffer::All { };
            struct IncompatibleListLengths: public All { IncompatibleListLengths(); };
        }
    }

    template<class T>
    class TimedDiskBuffer: public CVD::DiskBuffer2<T>
    {
    public:
        TimedDiskBuffer(const std::vector<std::string>& names, const std::vector<double> & times , CVD::VideoBufferFlags::OnEndOfBuffer eob = CVD::VideoBufferFlags::RepeatLastFrame);
    
        virtual CVD::DiskBuffer2Frame<T>* get_frame();
    protected:
        std::vector<double> file_times;
    };
    
    template<class T>
    inline TimedDiskBuffer<T>::TimedDiskBuffer(const std::vector<std::string>& names, const std::vector<double> & times, CVD::VideoBufferFlags::OnEndOfBuffer eob )
    : CVD::DiskBuffer2<T>(names, 1, eob )
    {
        if(times.size() != names.size())
            throw Exceptions::TimedDiskBuffer::IncompatibleListLengths();
        file_times = times;
    }
    
    //
    // GET FRAME
    //
    template<class T>
    inline CVD::DiskBuffer2Frame<T>* TimedDiskBuffer<T>::get_frame()
    {
        int current_frame = this->next_frame;
        if(current_frame < 0)
            current_frame = 0;
        // get a frame from the super class
        CVD::DiskBuffer2Frame<T> * vf = CVD::DiskBuffer2<T>::get_frame();
        vf->timestamp(file_times[current_frame]);
        return vf;
    }
}

#endif