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engine.h

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#ifndef _ENGINE_H
#define _ENGINE_H

#include <qobject.h>
#include <kurl.h>
#include <arts/kmedia2.h>
#include <noatun/playlist.h>

class Visualization;

namespace Arts
{
    class SoundServerV2;

    class Synth_AMAN_PLAY;
}

namespace Noatun
{
    class StereoEffectStack;
    class StereoVolumeControl;
    class Equalizer;
    class Session;
}

class NoatunApp;

/**
 * Handles all playing, connecting to aRts.
 * Does almost everything related to multimedia.
 * Most interfacing should be done with Player
 **/
class Engine : public QObject
{
Q_OBJECT
friend class NoatunApp;
public:
    Engine(QObject *parent=0);
    ~Engine();
    void setInitialized();
    bool initialized() const;
    
public slots:
    /**
     * opens the file, use play() to start playing
     **/
    bool open(const PlaylistItem &file);
    /**
     * Continues playing
     **/
    bool play();
    /**
     * Terminates playing, does not close the file
     **/
    void pause();
    /**
     * resets the engine
     **/
    void stop();
    /**
     * skips to a timecode
     * unit is milliseconds
     **/
    void seek(int msec);

    void setVolume(int percent);

signals:
    void done();
    /**
     * emitted when arts dies and noatun has to start 
     * it again. This is called when the new arts
     * is already initialized
     **/
    void artsError();
    
public:
    int state();
    int position(); // return position in milliseconds
    int length(); // return track-length in milliseconds
    int volume() const;

private:
    int openMixerFD();
    void closeMixerFD(int);
    void useHardwareMixer(bool);
    bool initArts();

public:
    Arts::SoundServerV2 *server() const;
    Arts::PlayObject playObject() const;
    Arts::SoundServerV2 *simpleSoundServer() const;
    Noatun::StereoEffectStack *effectStack() const;
    Noatun::Equalizer *equalizer() const;
    Noatun::StereoEffectStack *visualizationStack() const;
    Noatun::StereoEffectStack *globalEffectStack() const;
    Noatun::Session *session() const;

private:
    class EnginePrivate;
    EnginePrivate *d;
    bool mPlay;
};

#endif

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