qdarwinaudiosink_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef IOSAUDIOOUTPUT_H
#define IOSAUDIOOUTPUT_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <private/qaudiosystem_p.h>
#include <private/qaudiostatemachine_p.h>
 
#if defined(Q_OS_MACOS)
# include <CoreAudio/CoreAudio.h>
#endif
#include <AudioUnit/AudioUnit.h>
#include <CoreAudio/CoreAudioTypes.h>
 
#include <QtCore/QIODevice>
#include <qdarwinaudiodevice_p.h>
#include <qsemaphore.h>
 
QT_BEGIN_NAMESPACE
 
class QDarwinAudioSinkBuffer;
class QTimer;
class QCoreAudioDeviceInfo;
class CoreAudioRingBuffer;
 
class QDarwinAudioSinkBuffer : public QObject
{
    Q_OBJECT
 
public:
    QDarwinAudioSinkBuffer(int bufferSize, int maxPeriodSize, QAudioFormat const& audioFormat);
    ~QDarwinAudioSinkBuffer();
 
    qint64 readFrames(char *data, qint64 maxFrames);
    qint64 writeBytes(const char *data, qint64 maxSize);
 
    int available() const;
 
    bool deviceAtEnd() const;
 
    void reset();
 
    void setPrefetchDevice(QIODevice *device);
 
    QIODevice *prefetchDevice() const;
 
    void setFillingEnabled(bool enabled);
 
signals:
    void readyRead();
 
private slots:
    void fillBuffer();
 
private:
    bool m_deviceError = false;
    bool m_fillingEnabled = false;
    bool m_deviceAtEnd = false;
    const int m_maxPeriodSize = 0;
    const int m_bytesPerFrame = 0;
    const int m_periodTime = 0;
    QIODevice *m_device = nullptr;
    QTimer *m_fillTimer = nullptr;
    std::unique_ptr<CoreAudioRingBuffer> m_buffer;
};
 
class QDarwinAudioSinkDevice : public QIODevice
{
public:
    QDarwinAudioSinkDevice(QDarwinAudioSinkBuffer *audioBuffer, QObject *parent);
 
    qint64 readData(char *data, qint64 len);
    qint64 writeData(const char *data, qint64 len);
 
    bool isSequential() const { return true; }
 
private:
    QDarwinAudioSinkBuffer *m_audioBuffer;
};
 
 
class QDarwinAudioSink : public QPlatformAudioSink
{
    Q_OBJECT
 
public:
    QDarwinAudioSink(const QAudioDevice &device, QObject *parent);
    ~QDarwinAudioSink();
 
    void start(QIODevice *device);
    QIODevice *start();
    void stop();
    void reset();
    void suspend();
    void resume();
    qsizetype bytesFree() const;
    void setBufferSize(qsizetype value);
    qsizetype bufferSize() const;
    qint64 processedUSecs() const;
    QAudio::Error error() const;
    QAudio::State state() const;
    void setFormat(const QAudioFormat &format);
    QAudioFormat format() const;
 
    void setVolume(qreal volume);
    qreal volume() const;
 
private slots:
    void inputReady();
    void updateAudioDevice();
 
private:
    enum ThreadState { Running, Draining, Stopped };
 
    static OSStatus renderCallback(void *inRefCon,
                                    AudioUnitRenderActionFlags *ioActionFlags,
                                    const AudioTimeStamp *inTimeStamp,
                                    UInt32 inBusNumber,
                                    UInt32 inNumberFrames,
                                    AudioBufferList *ioData);
 
    bool open();
    void close();
    void onAudioDeviceIdle();
    void onAudioDeviceError();
    void onAudioDeviceDrained();
 
    QAudioDevice m_audioDeviceInfo;
    QByteArray m_device;
 
    static constexpr int DEFAULT_BUFFER_SIZE = 8 * 1024;
 
    bool m_isOpen = false;
    int m_internalBufferSize = DEFAULT_BUFFER_SIZE;
    int m_periodSizeBytes = 0;
    qint64 m_totalFrames = 0;
    QAudioFormat m_audioFormat;
    QIODevice *m_audioIO = nullptr;
#if defined(Q_OS_MACOS)
    AudioDeviceID m_audioDeviceId;
#endif
    AudioUnit m_audioUnit = 0;
    bool m_audioUnitStarted = false;
    Float64 m_clockFrequency = 0;
    AudioStreamBasicDescription m_streamFormat;
    std::unique_ptr<QDarwinAudioSinkBuffer> m_audioBuffer;
    qreal m_cachedVolume = 1.;
#if defined(Q_OS_MACOS)
    qreal m_volume = 1.;
#endif
    bool m_pullMode = false;
 
    QAudioStateMachine m_stateMachine;
    QSemaphore m_drainSemaphore;
};
 
QT_END_NAMESPACE
 
#endif // IOSAUDIOOUTPUT_H