packet.h

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2003 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_DVD_PACKET_PACKET_H
#define DXR3PLAYER_DVD_PACKET_PACKET_H
//------------------------------------------------------------------------------

#include <cstdlib>
#include <cassert>

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

namespace dvd { namespace packet {

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

class PacketProcessor;

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

/**
 * Base class for packets used in the system.
 */
class Packet
{    
private:
    /**
     * The reference counter.
     */
    size_t referenceCount;

    /**
     * Packets are not supposed to be copied.
     */
    Packet(const Packet&);
    
    Packet& operator=(const Packet&);
    
public:
    /**
     * Default constructor.
     */
    Packet();

    /**
     * Virtual destructor.
     */
    virtual ~Packet() {}

    /**
     * Increase the reference counter.
     */
    void addReference();

    /**
     * Decrease the reference counter and delete the object itself, if
     * reaches 0.
     */
    void removeReference();

    /**
     * Process the packet on a packet processor.
     */
    virtual void processOn(PacketProcessor& processor) = 0;
    
    /**
     * Put the description of the packet into the given character
     * buffer.
     */
    virtual void getDescription(char* dest, size_t length) const;
};

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

inline Packet::Packet() : referenceCount(0)
{
}

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

inline void Packet::addReference()
{
    ++referenceCount;
}

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

inline void Packet::removeReference()
{
    assert(referenceCount>0);
    
    --referenceCount;

    if (referenceCount==0) {
        delete this;
    }
}

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

} /* namespace dvd::packet */ } /* namespace dvd */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_PACKET_PACKET_H

// Local variables:
// mode: c++
// End: