systemtimer.h

Linux下比较早的基于命令行的DVD播放器

// Copyright (c) 2004 by Istv醤 V醨adi

// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// 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 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

#ifndef DXR3PLAYER_OUTPUT_SYSTEMTIMER_H
#define DXR3PLAYER_OUTPUT_SYSTEMTIMER_H
//------------------------------------------------------------------------------

#include "Timer.h"

#include "util/Util.h"

//------------------------------------------------------------------------------

namespace output {

//------------------------------------------------------------------------------

/**
 * Timer using the system clock. Its relative frequency (i.e. ratio
 * between PTS and time) can be adjusted.
 */
class SystemTimer : public Timer
{
private:
    /**
     * The SCR frequency in mHz.
     */
    unsigned scrFrequency;

    /**
     * The starting time, i.e. the time of the 0 SCR.
     */
    millis_t startTime;
    
public:
    /**
     * Construct the timer.
     */
    SystemTimer();

    /**
     * Reset the timer.
     */
    virtual void reset();
    
    /**
     * Start the timer.
     */
    void start();
    
    /**
     * Adjust the frequency if the given PTS is the correct value.
     */
    virtual void adjustFrequency(pts_t shouldBeSCR);

    /**
     * Get the current SCR.
     */
    virtual pts_t getCurrentSCR() const;

    /**
     * Get the time in milliseconds for the given PTS.
     */
    virtual millis_t getMillis(pts_t scr) const;

    /**
     * Get the PTS for the given time in milliseconds.
     */
    pts_t getPTS(millis_t millis) const;
    
};

//------------------------------------------------------------------------------
// Inline definitions
//------------------------------------------------------------------------------

inline SystemTimer::SystemTimer() : 
    scrFrequency(Util::ptsFrequency * 1000),
    startTime(0)
{
}

//------------------------------------------------------------------------------

} /* namespace output */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_OUTPUT_SYSTEMTIMER_H

// Local Variables:
// mode: C++
// c-basic-offset: 4
// indent-tabs-mode: nil
// End: