qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/opensles/qopenslesaudiooutput.h

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#ifndef QOPENSLESAUDIOOUTPUT_H
#define QOPENSLESAUDIOOUTPUT_H

#include <qaudiosystem.h>
#include <SLES/OpenSLES.h>
#include <qbytearray.h>
#include <qmap.h>
#include <QTime>
#include <QIODevice>

QT_BEGIN_NAMESPACE

class QOpenSLESAudioOutput : public QAbstractAudioOutput
{
    Q_OBJECT

public:
    QOpenSLESAudioOutput(const QByteArray &device);
    ~QOpenSLESAudioOutput();

    void start(QIODevice *device) override;
    QIODevice *start() override;
    void stop() override;
    void reset() override;
    void suspend() override;
    void resume() override;
    int bytesFree() const override;
    int periodSize() const override;
    void setBufferSize(int value) override;
    int bufferSize() const override;
    void setNotifyInterval(int milliSeconds) override;
    int notifyInterval() const override;
    qint64 processedUSecs() const override;
    qint64 elapsedUSecs() const override;
    QAudio::Error error() const override;
    QAudio::State state() const override;
    void setFormat(const QAudioFormat &format) override;
    QAudioFormat format() const override;

    void setVolume(qreal volume) override;
    qreal volume() const override;

    void setCategory(const QString &category) override;
    QString category() const override;

private:
    friend class SLIODevicePrivate;

    Q_INVOKABLE void onEOSEvent();
    Q_INVOKABLE void onBytesProcessed(qint64 bytes);
    void bufferAvailable(quint32 count, quint32 playIndex);

    static void playCallback(SLPlayItf playItf, void *ctx, SLuint32 event);
    static void bufferQueueCallback(SLBufferQueueItf bufferQueue, void *ctx);

    bool preparePlayer();
    void destroyPlayer();
    void stopPlayer();
    void startPlayer();
    qint64 writeData(const char *data, qint64 len);

    void setState(QAudio::State state);
    void setError(QAudio::Error error);

    SLmillibel adjustVolume(qreal vol);

    QByteArray m_deviceName;
    QAudio::State m_state;
    QAudio::Error m_error;
    SLObjectItf m_outputMixObject;
    SLObjectItf m_playerObject;
    SLPlayItf m_playItf;
    SLVolumeItf m_volumeItf;
    SLBufferQueueItf m_bufferQueueItf;
    QIODevice *m_audioSource;
    char *m_buffers;
    qreal m_volume;
    bool m_pullMode;
    int m_nextBuffer;
    int m_bufferSize;
    int m_notifyInterval;
    int m_periodSize;
    qint64 m_elapsedTime;
    qint64 m_processedBytes;
    QAtomicInt m_availableBuffers;
    SLuint32 m_eventMask;
    bool m_startRequiresInit;

    qint32 m_streamType;
    QTime m_clockStamp;
    QAudioFormat m_format;
    QString m_category;
    static QMap<QString, qint32> m_categories;
};

class SLIODevicePrivate : public QIODevice
{
    Q_OBJECT

public:
    inline SLIODevicePrivate(QOpenSLESAudioOutput *audio) : m_audioDevice(audio) {}
    inline ~SLIODevicePrivate() override {}

protected:
    inline qint64 readData(char *, qint64) override { return 0; }
    inline qint64 writeData(const char *data, qint64 len) override;

private:
    QOpenSLESAudioOutput *m_audioDevice;
};

qint64 SLIODevicePrivate::writeData(const char *data, qint64 len)
{
    Q_ASSERT(m_audioDevice);
    return m_audioDevice->writeData(data, len);
}

QT_END_NAMESPACE

#endif // QOPENSLESAUDIOOUTPUT_H