qtmultimedia/src/imports/audioengine/qdeclarative_audioengine_p.h

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#ifndef QDECLARATIVEAUDIOENGINE_P_H
#define QDECLARATIVEAUDIOENGINE_P_H

#include <QtQml/qqml.h>
#include <QtQml/qqmlcomponent.h>
#include <QtQml/qqmlpropertymap.h>
#include <QtCore/QMap>
#include <QtCore/QList>
#include <QTimer>
#include "qaudioengine_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QDeclarativeSoundInstance;
class QDeclarativeAudioListener;
class QDeclarativeAudioCategory;
class QDeclarativeAudioSample;
class QDeclarativeSound;
class QDeclarativePlayVariation;
class QAudioCategory;
class QDeclarativeAttenuationModel;
class QSoundInstance;

class QDeclarativeAudioEngine : public QObject, public QQmlParserStatus
{
    Q_OBJECT
    Q_INTERFACES(QQmlParserStatus)
    Q_PROPERTY(QQmlListProperty<QObject> bank READ bank CONSTANT)
    Q_PROPERTY(QObject* categories READ categories CONSTANT)
    Q_PROPERTY(QObject* samples READ samples CONSTANT)
    Q_PROPERTY(QObject* sounds READ sounds CONSTANT)
    Q_PROPERTY(bool loading READ isLoading NOTIFY isLoadingChanged)
    Q_PROPERTY(int liveInstances READ liveInstanceCount NOTIFY liveInstanceCountChanged)
    Q_PROPERTY(QDeclarativeAudioListener* listener READ listener CONSTANT)
    Q_PROPERTY(qreal dopplerFactor READ dopplerFactor WRITE setDopplerFactor)
    Q_PROPERTY(qreal speedOfSound READ speedOfSound WRITE setSpeedOfSound)
    Q_CLASSINFO("DefaultProperty", "bank")

public:
    QDeclarativeAudioEngine(QObject *parent = 0);
    ~QDeclarativeAudioEngine();

    void classBegin();
    void componentComplete();

    //This is used for tracking all objects declared inside AudioEngine
    //see appendFunction
    QQmlListProperty<QObject> bank();

    QObject* categories();
    QObject* samples();
    QObject* sounds();

    QDeclarativeAudioListener* listener() const;

    qreal dopplerFactor() const;
    void setDopplerFactor(qreal dopplerFactor);

    qreal speedOfSound() const;
    void setSpeedOfSound(qreal speedOfSound);

    bool isLoading() const;

    int liveInstanceCount() const;

    //for child elements
    bool isReady() const;
    QAudioEngine* engine() const;

    //if managed, then the instance should start playing immediately and will be collected
    //when the playback finished
    QDeclarativeSoundInstance* newDeclarativeSoundInstance(bool managed);

    //internal sound instance is different from declarativeSoundInstance
    //declarative instance is more like a soundInstance helper which can
    //switch to different sound instance conveniently while sound instance
    //must be mapped to one sound definition.
    QSoundInstance* newSoundInstance(const QString &name);
    void releaseSoundInstance(QSoundInstance* instance);

Q_SIGNALS:
    void ready();
    void liveInstanceCountChanged();
    void isLoadingChanged();
    void finishedLoading();

private Q_SLOTS:
    void updateSoundInstances();
    void handleLoadingChanged();

private:
    Q_DISABLE_COPY(QDeclarativeAudioEngine);
    bool m_complete;

    //see bank()
    static void appendFunction(QQmlListProperty<QObject> *property, QObject *value);

    QDeclarativeAudioListener *m_listener;
    QDeclarativeAudioCategory* m_defaultCategory;
    QQmlPropertyMap m_categories;
    QQmlPropertyMap m_samples;
    QQmlPropertyMap m_sounds;

    //Use strong type here since no need to for AttenuationModel to be accessible directly by user
    //after config stage
    QDeclarativeAttenuationModel *m_defaultAttenuationModel;
    QMap<QString, QDeclarativeAttenuationModel*> m_attenuationModels;

    QAudioEngine *m_audioEngine;

    //for execution stage management
    QList<QSoundInstance*> m_soundInstancePool;
    QList<QSoundInstance*> m_activeSoundInstances;

    QTimer m_updateTimer;
    QList<QDeclarativeSoundInstance*> m_managedDeclSoundInstances;
    QList<QDeclarativeSoundInstance*> m_managedDeclSndInstancePool;
    void releaseManagedDeclarativeSoundInstance(QDeclarativeSoundInstance* declSndInstance);
};

QT_END_NAMESPACE

QT_END_HEADER

#endif