statetracker.h

Linux下比较早的基于命令行的DVD播放器

// Copyright (c) 2004 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_OUTPUT_STATETRACKER
#define DXR3PLAYER_OUTPUT_STATETRACKER
//------------------------------------------------------------------------------

#include "OutputProcessor.h"

#include "dvd/packet/CommandExecutor.h"

#include "dvd/vm/Processor.h"

#include "sched/Schedulable.h"

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

namespace dvd { 

namespace packet {

class PacketQueue;

} /* namespace dvd::packet */ 

namespace vm {

class ProcessorCommandQueue;

} /* namespace dvd::vm */

} /* namespace dvd */

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

namespace output {

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

class Timer;
class OSDHandler;

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

/**
 * This class keeps track of the output VM state for the DVD. It
 * handles various events that should occur at a certain time
 * instance. It assumes, that packets arrive in the queue in the
 * correct order.
 */
class StateTracker : public sched::Schedulable,
                     public dvd::packet::CommandExecutor
                     
{
public:
    /**
     * Interface for the actual button handlers
     */
    class ButtonHandler
    {
    public:
        /**
         * Virtual destructor
         */
        virtual ~ButtonHandler() {}

        /**
         * Highlight a certain button.
         */
        virtual void highlightButton(int color, int contrast,
                                     size_t top, size_t bottom,
                                     size_t left, size_t right) = 0;

        /**
         * Clear the button currently displayed.
         */
        virtual void clearButton() = 0;
    };

private:
    /**
     * The timer.
     */
    Timer& timer;

    /**
     * The input queue.
     */
    dvd::packet::PacketQueue& inputQueue;

    /**
     * The button handler.
     */
    ButtonHandler& buttonHandler;

    /**
     * The OSD handler.
     */
    OSDHandler& osdHandler;

    /**
     * The processor command queue
     */
    dvd::vm::ProcessorCommandQueue& processorCommandQueue;
    
    /**
     * Our own processor.
     */
    dvd::vm::Processor processor;

    /**
     * The previous PCI.
     */
    Reference<dvd::demux::PCI> previousPCI;
    
    /**
     * The current PCI.
     */
    Reference<dvd::demux::PCI> currentPCI;

    /**
     * The next display format (the packet comes before a PCI becomes
     * valid).
     */
    displayFormat_t nextDisplayFormat;

    /**
     * The current display format (the packet comes before a PCI becomes
     * valid).
     */
    displayFormat_t currentDisplayFormat;

    /**
     * The audio stream number. It is always valid after a processor
     * update.
     */
    unsigned audioStreamNumber;

    /**
     * The SPU stream number. It is always valid after a processor
     * update.
     */
    unsigned spuStreamNumber;

    /**
     * Indicate if the buttons should be hidden.
     */
    bool hideButtons;
    
public:
    /**
     * Construct the state tracker.
     */
    StateTracker(Timer& timer,
                 dvd::packet::PacketQueue& inputQueue,
                 ButtonHandler& buttonHandler,
                 OSDHandler& osdHandler,
                 dvd::vm::ProcessorCommandQueue& processorCommandQueue,
                 dvd::DVD& dvd);

    /**
     * @see sched::Schedulable::run
     */
    virtual void run();

    /**
     * @see sched::Schedulable::printStatus
     */
    virtual void printStatus() const;

    /**
     * Reset the state tracker.
     */
    void reset();

    /**
     * Handle the given user action. It handles only actions that
     * may require modifying the processor state.
     */
    OutputProcessor::processorChange_t 
    handleOperation(input::InputListener::operation_t operation,
                    dvd::vm::State& processorState);

    /**
     * Process the "Up" button.
     */
    bool buttonUp();

    /**
     * Process the "Down" button.
     */
    bool buttonDown();

    /**
     * Process the "Left" button.
     */
    bool buttonLeft();

    /**
     * Process the "Right" button.
     */
    bool buttonRight();

    /**
     * Activate the current button.
     */
    bool activateButton();

    /**
     * Enter the menu with the given ID.
     */
    bool enterMenu();

    /**
     * Get the VM state.
     */
    const dvd::vm::State& getVMState() const;

    /**
     * @see dvd::packet::CommandExecutor::setPCI
     */
    virtual void setPCI(Reference<dvd::demux::PCI> pci);

    /**
     * @see dvd::packet::CommandExecutor::updateProcessor
     */
    virtual void updateProcessor(size_t commandID);

private:
    /**
     * Update the highlight on screen.
     */
    bool updateHighlight();

    /**
     * Update the highlight according to the given button info.
     */
    void highlightButton(dvd::demux::HighlightInformation highlightInfo,
                         unsigned buttonNo);

    /**
     * Handle the given button operation.
     */
    OutputProcessor::processorChange_t
    StateTracker::handleButton(input::InputListener::operation_t operation);

    /**
     * Handle the given menu operation.
     */
    OutputProcessor::processorChange_t
    StateTracker::handleMenu(input::InputListener::operation_t operation);

    /**
     * Update the user position.
     */
    void updateUserPosition() const;

    /**
     * Update the languages.
     */
    void updateLanguages() const;

    /**
     * Determine if at least the given number of seconds elapsed from
     * the current cell.
     */
    bool hasCellElapsed(size_t numSeconds) const;
};

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

inline StateTracker::StateTracker(Timer& timer,
                                  dvd::packet::PacketQueue& inputQueue,
                                  ButtonHandler& buttonHandler,
                                  OSDHandler& osdHandler,
                                  dvd::vm::ProcessorCommandQueue& processorCommandQueue,
                                  dvd::DVD& dvd) :
    sched::Schedulable("output::StateTracker"),
    timer(timer),
    inputQueue(inputQueue),
    buttonHandler(buttonHandler),
    osdHandler(osdHandler),
    processorCommandQueue(processorCommandQueue),
    processor(&dvd),
    nextDisplayFormat(DF_SMALLSCREEN),
    currentDisplayFormat(DF_SMALLSCREEN),
    audioStreamNumber(0),
    spuStreamNumber(0),
    hideButtons(false)
{
}

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



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

} /* namespace output */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_OUTPUT_STATETRACKER

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