datablockpacket.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_DATABLOCKPACKET_H
#define DXR3PLAYER_DVD_PACKET_DATABLOCKPACKET_H
//------------------------------------------------------------------------------

#include "dvd/packet/Packet.h"
#include "dvd/packet/DataBlockType.h"
#include "dvd/packet/PacketConverter.h"

#include "dvd/Statistics.h"

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

namespace dvd { namespace packet {

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

/**
 * Base class for packets that represent some data block. The data
 * block can be a sector, audio or video data. Its type is represented
 * by a reference to an instance of a DataBlockType.
 */
class DataBlockPacket : public Packet
{
public:
    /**
     * Convert the given base packet reference into a timed data block
     * packet reference, if that packet is a timed data block packet.
     */
    static Reference<DataBlockPacket> convert(Reference<Packet> packet);

private:
    /**
     * The type of the data block.
     */
    const DataBlockType& type;

protected:
    /**
     * Construct a data block packet with the given tag.
     */
    explicit DataBlockPacket(const DataBlockType& type);

public:
    /**
     * Virtual destructor.
     */
    virtual ~DataBlockPacket();

    /**
     * @see Packet::processOn.
     */
    virtual void processOn(PacketProcessor& processor);

    /**
     * Get the type;
     */
    const DataBlockType& getType() const;

    /**
     * Check if the packet is of the given type.
     */
    bool isOfType(const DataBlockType& t) const;

    /**
     * Get the data represented by the packet.
     */
    virtual const unsigned char* getData() const = 0;

    /**
     * Get the length of the data represented by the packet.
     */
    virtual size_t getLength() const = 0;
};

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

inline Reference<DataBlockPacket> 
DataBlockPacket::convert(Reference<Packet> packet)
{
    return PacketConverter<DataBlockPacket>().convert(packet);
}

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

inline DataBlockPacket::DataBlockPacket(const DataBlockType& type) :
    type(type)
{
    dvd::Statistics::addDataBlockPacket(type);
}

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

inline DataBlockPacket::~DataBlockPacket()
{
    dvd::Statistics::removeDataBlockPacket(type);
}

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

inline const DataBlockType& DataBlockPacket::getType() const
{
    return type;
}

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

inline bool DataBlockPacket::isOfType(const DataBlockType& t) const
{
    return type==t;
}

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

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

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_PACKET_DATABLOCKPACKET_H

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