qaudioengine.h

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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-3.0-only
 
#ifndef QAUDIOENGINE_H
#define QAUDIOENGINE_H
 
#include <QtSpatialAudio/qtspatialaudioglobal.h>
#include <QtCore/qobject.h>
 
QT_BEGIN_NAMESPACE
 
class QAudioEnginePrivate;
class QAudioDevice;
 
class Q_SPATIALAUDIO_EXPORT QAudioEngine : public QObject
{
    Q_OBJECT
    Q_PROPERTY(OutputMode outputMode READ outputMode WRITE setOutputMode NOTIFY outputModeChanged)
    Q_PROPERTY(QAudioDevice outputDevice READ outputDevice WRITE setOutputDevice NOTIFY outputDeviceChanged)
    Q_PROPERTY(float masterVolume READ masterVolume WRITE setMasterVolume NOTIFY masterVolumeChanged)
    Q_PROPERTY(bool paused READ paused WRITE setPaused NOTIFY pausedChanged)
    Q_PROPERTY(float distanceScale READ distanceScale WRITE setDistanceScale NOTIFY distanceScaleChanged)
public:
    QAudioEngine() : QAudioEngine(nullptr) {};
    explicit QAudioEngine(QObject *parent) : QAudioEngine(44100, parent) {}
    explicit QAudioEngine(int sampleRate, QObject *parent = nullptr);
    ~QAudioEngine() override;
 
    enum OutputMode {
        Surround,
        Stereo,
        Headphone
    };
    Q_ENUM(OutputMode)
 
    void setOutputMode(OutputMode mode);
    OutputMode outputMode() const;
 
    int sampleRate() const;
 
    void setOutputDevice(const QAudioDevice &device);
    QAudioDevice outputDevice() const;
 
    void setMasterVolume(float volume);
    float masterVolume() const;
 
    void setPaused(bool paused);
    bool paused() const;
 
    void setRoomEffectsEnabled(bool enabled);
    bool roomEffectsEnabled() const;
 
    static constexpr float DistanceScaleCentimeter = 1.f;
    static constexpr float DistanceScaleMeter = 100.f;
 
    void setDistanceScale(float scale);
    float distanceScale() const;
 
Q_SIGNALS:
    void outputModeChanged();
    void outputDeviceChanged();
    void masterVolumeChanged();
    void pausedChanged();
    void distanceScaleChanged();
 
public Q_SLOTS:
    void start();
    void stop();
 
    void pause() { setPaused(true); }
    void resume() { setPaused(false); }
 
private:
    Q_DECLARE_PRIVATE(QAudioEngine)
    friend class QAudioEngineThreaded;
 
    // ### Qt7: remove unused member
    QT6_ONLY(void *unused = nullptr;) // for ABI compatibility
};
 
QT_END_NAMESPACE
 
#endif