datablockpartpackettemplate.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_DATABLOCKPARTPACKETTEMPLATE_H
#define DXR3PLAYER_DVD_PACKET_DATABLOCKPARTPACKETTEMPLATE_H
//------------------------------------------------------------------------------

#include "dvd/packet/ReferencePacketTemplate.h"
#include "dvd/packet/DataBlockPacket.h"

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

namespace dvd { namespace packet {

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

/**
 * Mixin class for data block packets that maintain a reference to
 * another  data blockpacket, and its data is a portion of that block's data.
 */
template <class Super>
class DataBlockPartPacketTemplate : 
        public ReferencePacketTemplate<Super, DataBlockPacket>
{
protected:
    /**
     * Import 'otherPacket' from the parent.
     */
    ReferencePacketTemplate<Super, DataBlockPacket>::otherPacket;

private:
    /**
     * The offset within the other packet's data.
     */
    size_t offset;
    
    /**
     * The length of data.
     */
    size_t length;


public:
    /**
     * Construct a part packet.
     */
    DataBlockPartPacketTemplate(Reference<DataBlockPacket> otherPacket,
                                size_t offset, size_t length);
    
    /**
     * Construct a part packet with another parameter passed to the
     * superclass' constructor.
     */
    template <typename T>
    DataBlockPartPacketTemplate(T& p1, 
                                Reference<DataBlockPacket> otherPacket,
                                size_t offset, size_t length);
    
    /**
     * Construct a part packet with 2 other parameters passed to the
     * superclass' constructor.
     */
    template <typename T1, typename T2>
    DataBlockPartPacketTemplate(T1 p1, T2 p2,
                                Reference<DataBlockPacket> otherPacket,
                                size_t offset, size_t length);
    
    /**
     * Construct a part packet with 3 other parameters passed to the
     * superclass' constructor.
     */
    template <typename T1, typename T2, typename T3>
    DataBlockPartPacketTemplate(T1 p1, T2 p2, T3 p3,
                                Reference<DataBlockPacket> otherPacket,
                                size_t offset, size_t length);
    
    /**
     * Construct a part packet with 4 other parameters passed to the
     * superclass' constructor.
     */
    template <typename T1, typename T2, typename T3, typename T4>
    DataBlockPartPacketTemplate(T1 p1, T2 p2, T3 p3, T4 p4,
                                Reference<DataBlockPacket> otherPacket,
                                size_t offset, size_t length);
    
    /**
     * @see DataBlockPacket::getData
     */
    virtual const unsigned char* getData() const;

    /**
     * @see DataBlockPacket::getLength
     */
    virtual size_t getLength() const;
};

//------------------------------------------------------------------------------
// Template definitions
//------------------------------------------------------------------------------

template <class Super>
DataBlockPartPacketTemplate<Super>::
DataBlockPartPacketTemplate(Reference<DataBlockPacket> otherPacket,
                            size_t offset, size_t length) :
    ReferencePacketTemplate<Super, DataBlockPacket>(otherPacket),
    offset(offset), length(length)
{
    assert( (offset+length) <= otherPacket->getLength() );
}    

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

template <class Super>
template <typename T>
DataBlockPartPacketTemplate<Super>::
DataBlockPartPacketTemplate(T& p1, 
                            Reference<DataBlockPacket> otherPacket,
                            size_t offset, size_t length) :
    ReferencePacketTemplate<Super, DataBlockPacket>(p1, otherPacket),
    offset(offset), length(length)
{
    assert( (offset+length) <= otherPacket->getLength() );
}    

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

template <class Super>
template <typename T1, typename T2>
DataBlockPartPacketTemplate<Super>::
DataBlockPartPacketTemplate(T1 p1, T2 p2,
                            Reference<DataBlockPacket> otherPacket,
                            size_t offset, size_t length) :
    ReferencePacketTemplate<Super, DataBlockPacket>(p1, p2, otherPacket),
    offset(offset), length(length)
{
    assert( (offset+length) <= otherPacket->getLength() );
}    

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

template <class Super>
template <typename T1, typename T2, typename T3>
DataBlockPartPacketTemplate<Super>::
DataBlockPartPacketTemplate(T1 p1, T2 p2, T3 p3,
                            Reference<DataBlockPacket> otherPacket,
                            size_t offset, size_t length) :
    ReferencePacketTemplate<Super, DataBlockPacket>(p1, p2, p3, otherPacket),
    offset(offset), length(length)
{
    assert( (offset+length) <= otherPacket->getLength() );
}    

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

template <class Super>
template <typename T1, typename T2, typename T3, typename T4>
DataBlockPartPacketTemplate<Super>::
DataBlockPartPacketTemplate(T1 p1, T2 p2, T3 p3, T4 p4,
                            Reference<DataBlockPacket> otherPacket,
                            size_t offset, size_t length) :
    ReferencePacketTemplate<Super, DataBlockPacket>(p1, p2, p3, p4, otherPacket),
    offset(offset), length(length)
{
    assert( (offset+length) <= otherPacket->getLength() );
}    

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

template <class Super>
const unsigned char* 
DataBlockPartPacketTemplate<Super>::getData() const
{
    return otherPacket->getData() + offset;
}

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

template <class Super>
size_t DataBlockPartPacketTemplate<Super>::getLength() const
{
    return length;
}

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

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

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_PACKET_DATABLOCKPARTPACKETTEMPLATE_H

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