extension.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_DEMUX_EXTENSION_H
#define DXR3PLAYER_DVD_DEMUX_EXTENSION_H
//------------------------------------------------------------------------------

#include "types.h"

#include <cstdlib>

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

namespace dvd { namespace demux {

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

class SectorBitReader;

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

/**
 * Extension for PES packets.
 */
class Extension
{
public:
    struct Header {
        unsigned char orig_or_copy : 1;
        unsigned char copyright : 1;
        unsigned char data_alignment : 1;
        unsigned char pes_priority : 1;
        unsigned char pes_scrambling : 2;
        unsigned char res1 : 2;

        unsigned char pes_ext : 1;
        unsigned char pes_crc : 1;
        unsigned char add_copy : 1;
        unsigned char dsm_mode : 1;
        unsigned char es_rate : 1;
        unsigned char escr : 1;
        unsigned char pts_dts : 2;
        
        unsigned char length;

        /**
         * Construct a default header.
         */
        Header();
    };

private:
    /**
     * Time stamp structure.
     */
    struct TS {
        unsigned char res1     : 1;
        unsigned char ts_32_30 : 3;
        unsigned char res2     : 4;

        unsigned char ts_29_22;

        unsigned char res3     : 1;
        unsigned char ts_21_15 : 7;
        
        unsigned char ts_14_07;

        unsigned char res4     : 1;
        unsigned char ts_06_00 : 7;

        /**
         * Get the value.
         */
        pts_t getValue() const;
    };

    /**
     * The header of the extension.
     */
    Header header;

    /**
     * The rest of the extension
     */
    unsigned char* rest;

public:
    /**
     * Default constructor.
     */
    Extension();
    
    /**
     * Construct the extension from the given reader
     */
    explicit Extension(SectorBitReader& reader);

    /**
     * Copy the extension.
     */
    Extension(const Extension& other);

    /**
     * Destroy the extension
     */
    ~Extension();

    /**
     * Assignment operator.
     */
    Extension& operator=(const Extension& other);

    /**
     * Get the header of the extension
     */
    const Header& getHeader() const;

    /**
     * Get the total length of the extension
     */
    size_t getLength() const;

    /**
     * Get the PTS data in the extension, if present, INVALID_PTS
     * otherwise.
     */
    pts_t getPTS() const;

    /**
     * Get the DTS data in the extension, if present, INVALID_PTS
     * otherwise.
     */
    pts_t getDTS() const;

    /**
     * Get the rest of the data.
     */
    const unsigned char* getRest() const;
};

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

inline Extension::~Extension()
{
    delete[] rest;
}

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

inline const Extension::Header& Extension::getHeader() const
{
    return header;
}

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

inline size_t Extension::getLength() const
{
    return sizeof(header) + header.length;
}

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

inline const unsigned char* Extension::getRest() const
{
    return rest;
}

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

} /* namespace dvd::demux */ } /* namespace dvd */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_DEMUX_EXTENSION_H

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