position.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_VM_POSITION_H
#define DXR3PLAYER_DVD_VM_POSITION_H
//------------------------------------------------------------------------------

#include "dvd/IFO.h"
#include "dvd/PGC.h"
#include "dvd/SectorPosition.h"

#include <cstdio>

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

namespace dvd {

class DVD;
class VTS;

}

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

namespace dvd { namespace vm {

class State;

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

/**
 * Class describing the position within the DVD.
 */
class Position : public SectorPosition
{
protected:
    /**
     * The state the position belongs to.
     */
    const State& state;

private:
    /**
     * The number of the PGC we play
     */
    unsigned pgcNumber;

    /**
     * The number of the cell we play.
     */
    unsigned cellNumber;

public:
    /**
     * Construct the position object to be in the first play PGC.
     */
    explicit Position(const State& state);

    /**
     * Copy construct the object.
     */
    Position(const Position& from);

    /**
     * Reset the position.
     */
    void reset();

    /**
     * Determine of the position is valid.
     */
    bool isValid() const;

    /**
     * Copy this position from the given other one.
     *
     * @param cellNo cell number to use. If 0, the one from the source
     * position is copied along with the sector number, otherwise this
     * number is used with a sector number of 0.
     */
    void copy(const Position& from, unsigned cellNo = 0);

    /**
     * Assignment operator.
     */
    Position& operator=(const Position& from);

    /**
     * Determine if this position is equal to the other one.
     */
    bool equals(const Position& other) const;

    /**
     * Set the PGC number.
     */
    void setPGCNumber(unsigned pgcNo);

    /**
     * Get the PGC number.
     */
    unsigned getPGCNumber() const;

    /**
     * Set the cell number.
     */
    void setCellNumber(unsigned cellNo);

    /**
     * Get the cell number.
     */
    unsigned getCellNumber() const;

    /**
     * Find the IFO the position designates. It can return 0.
     */
    const IFO* findIFO() const;

    /**
     * Get the Video Manager.
     */
    const VMG* getVMG() const;

    /**
     * Find the VTS structure corresponding to the current position.
     *
     * @return the VTS structure or 0 if not found.
     */
    const VTS* findVTS() const;

    /**
     * Get the PGC the position points to.
     */
    PGC getPGC() const;

    /**
     * Get the PGC table for the position. Cannot be
     * called while in the first play PGC.
     */
    PGCTable getPGCTable() const;

    /**
     * Get the playback info for the current cell.
     */
    CellPlaybackInfo getCellPlaybackInfo() const;

    /**
     * Get the "user position" for this position. This includes the
     * DVD title and chapter (part) numbers and the time offset within
     * the current PGC. The time offset returned is the time offset of
     * the beginning of the current cell, cell elapsed time from PCIs
     * or DSIs must be added to it.
     */
    unsigned long long getUserPosition(unsigned& titleNo, unsigned& partNo,
                                       unsigned long long& playbackTime,
                                       unsigned& fps) const;

    /**
     * Check if the given play mode is allowed in this position.
     */
    bool isPlayModeAllowed(playMode_t playMode) const;

    /**
     * Save the position to the given file.
     *
     * @return if the saving has succeeded
     */
    bool save(FILE* f) const;

    /**
     * Load the position from the given file.
     *
     * @return if the loading has succeeded
     */
    bool load(FILE* f);
};

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

inline Position::Position(const State& state) : 
    state(state),
    pgcNumber(0), 
    cellNumber(0)
{
}

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

inline Position::Position(const Position& from) :
    SectorPosition(),
    state(from.state)
{
    copy(from);
}

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

inline bool Position::isValid() const
{
    return pgcNumber!=0 && cellNumber!=0;
}

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

inline Position& Position::operator=(const Position& from)
{
    copy(from);
    return *this;
}

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

inline void Position::setPGCNumber(unsigned pgcNo)
{
    pgcNumber = pgcNo;
}

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

inline unsigned Position::getPGCNumber() const
{
    return pgcNumber;
}

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

inline void Position::setCellNumber(unsigned cellNo)
{
    cellNumber = cellNo;
}

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

inline unsigned Position::getCellNumber() const
{
    return cellNumber;
}

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

inline bool operator==(const Position& p1, const Position& p2)
{
    return p1.equals(p2);
}

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

} /* namespace dvd::vm */ } /* namespace dvd */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_VM_POSITION_H

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