qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/windowsaudio/qwindowsaudiooutput.h

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//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#ifndef QWINDOWSAUDIOOUTPUT_H
#define QWINDOWSAUDIOOUTPUT_H

#include "qwindowsaudioutils.h"

#include <QtCore/qdebug.h>
#include <QtCore/qelapsedtimer.h>
#include <QtCore/qstring.h>
#include <QtCore/qstringlist.h>
#include <QtCore/qdatetime.h>
#include <QtCore/qmutex.h>

#include <QtMultimedia/qaudio.h>
#include <QtMultimedia/qaudiodeviceinfo.h>
#include <QtMultimedia/qaudiosystem.h>

// For compat with 4.6
#if !defined(QT_WIN_CALLBACK)
#  if defined(Q_CC_MINGW)
#    define QT_WIN_CALLBACK CALLBACK __attribute__ ((force_align_arg_pointer))
#  else
#    define QT_WIN_CALLBACK CALLBACK
#  endif
#endif

QT_BEGIN_NAMESPACE

class QWindowsAudioOutput : public QAbstractAudioOutput
{
    Q_OBJECT
public:
    QWindowsAudioOutput(const QByteArray &device);
    ~QWindowsAudioOutput();

    qint64 write( const char *data, qint64 len );

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

    QIODevice* audioSource;
    QAudioFormat settings;
    QAudio::Error errorState;
    QAudio::State deviceState;

private slots:
    void feedback();
    bool deviceReady();

private:
    void pauseAndSleep();
    QByteArray m_device;
    int bytesAvailable;
    QElapsedTimer timeStamp;
    qint64 elapsedTimeOffset;
    QElapsedTimer timeStampOpened;
    qint32 buffer_size;
    qint32 period_size;
    qint32 blocks_count;
    qint64 totalTimeValue;
    bool pullMode;
    int intervalTime;
    qreal volumeCache;
    static void QT_WIN_CALLBACK waveOutProc( HWAVEOUT hWaveOut, UINT uMsg,
            DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2 );

    QMutex mutex;

    WAVEHDR* allocateBlocks(int size, int count);
    void freeBlocks(WAVEHDR* blockArray);
    bool open();
    void close();

    WAVEFORMATEXTENSIBLE wfx;
    HWAVEOUT hWaveOut;
    WAVEHDR* waveBlocks;
    volatile bool finished;
    volatile int waveFreeBlockCount;
    int waveCurrentBlock;
    char* audioBuffer;
};

class OutputPrivate : public QIODevice
{
    Q_OBJECT
public:
    OutputPrivate(QWindowsAudioOutput* audio);
    ~OutputPrivate();

    qint64 readData( char* data, qint64 len);
    qint64 writeData(const char* data, qint64 len);

private:
    QWindowsAudioOutput *audioDevice;
};

QT_END_NAMESPACE


#endif // QWINDOWSAUDIOOUTPUT_H