PlayHead.h

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// PlayHead.h: media playback controller 
// 
//   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
//   Free Software Foundation, Inc
// 
// 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 3 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 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


#ifndef GNASH_PLAYHEAD_H
#define GNASH_PLAYHEAD_H

#include <cstdint> // For C99 int types

// Forward declarations
namespace gnash {
    class VirtualClock;
}

namespace gnash {

class PlayHead {

public:

    enum PlaybackStatus {
        PLAY_PLAYING = 1,
        PLAY_PAUSED = 2
    };

    //
    PlayHead(VirtualClock* clockSource);

    //
    void setVideoConsumerAvailable()
    {
        _availableConsumers |= CONSUMER_VIDEO;
    }

    //
    void setAudioConsumerAvailable()
    {
        _availableConsumers |= CONSUMER_AUDIO;
    }

    std::uint64_t getPosition() const { return _position; }

    PlaybackStatus getState() const { return _state; }

    PlaybackStatus setState(PlaybackStatus newState);

    PlaybackStatus toggleState();

    bool isVideoConsumed() const
    {
        return (_positionConsumers & CONSUMER_VIDEO);
    }

    void setVideoConsumed()
    {
        _positionConsumers |= CONSUMER_VIDEO;
    }

    bool isAudioConsumed() const
    {
        return (_positionConsumers & CONSUMER_AUDIO);
    }

    void setAudioConsumed()
    {
        _positionConsumers |= CONSUMER_AUDIO;
    }

    //
    void seekTo(std::uint64_t position);

    //
    void advanceIfConsumed();
        

private:

    enum ConsumerFlag {
        CONSUMER_VIDEO = 1,
        CONSUMER_AUDIO = 2
    };

    std::uint64_t _position;

    PlaybackStatus _state;

    int _availableConsumers;

    int _positionConsumers;

    VirtualClock* _clockSource;

    //
    std::uint64_t _clockOffset;

};

} // end of gnash namespace

// __PLAYHEAD_H__
#endif