audiohandler.h

#ifndef AUDIOHANDLER_H
#define AUDIOHANDLER_H

/* QT Headers */
#include <QObject>
#include <QByteArray>
#include <QMutex>
#include <QtEndian>
#include <QtMath>
#include <QThread>
#include <QTime>
#include <QMap>
#include <QDebug>
#include <QTimer>

/* QT Audio Headers */
#include <QAudioOutput>
#include <QAudioFormat>

#if (QT_VERSION < QT_VERSION_CHECK(6,0,0))
#include <QAudioDeviceInfo>
#include <QAudioInput>
#include <QAudioOutput>
#else
#include <QMediaDevices>
#include <QAudioDevice>
#include <QAudioSource>
#include <QAudioSink>
#endif

#include <QIODevice>


/* wfview Packet types */
#include "packettypes.h"

/* Logarithmic taper for volume control */
#include "audiotaper.h"


/* Audio converter class*/
#include "audioconverter.h"


#define MULAW_BIAS 33
#define MULAW_MAX 0x1fff


// For QtMultimedia, use a native QIODevice
//class audioHandler : public QIODevice
class audioHandler : public QObject
{
    Q_OBJECT

public:
    audioHandler(QObject* parent = nullptr);
    virtual ~audioHandler();

    virtual int getLatency();

    virtual void start();
    virtual void stop();

    virtual quint16 getAmplitude();

public slots:
    virtual bool init(audioSetup setup);
    virtual void changeLatency(const quint16 newSize);
    virtual void setVolume(unsigned char volume);
    virtual void incomingAudio(const audioPacket data);
    virtual void convertedInput(audioPacket audio);
    virtual void convertedOutput(audioPacket audio);
    virtual void getNextAudioChunk();

private slots:
    virtual void stateChanged(QAudio::State state);
    virtual void clearUnderrun();    


signals:
    void audioMessage(QString message);
    void sendLatency(quint16 newSize);
    void haveAudioData(const audioPacket& data);
    void haveLevels(quint16 amplitudePeak, quint16 amplitudeRMS,quint16 latency,quint16 current,bool under,bool over);
    void setupConverter(QAudioFormat in, codecType codecIn, QAudioFormat out, codecType codecOut, quint8 opus, quint8 resamp);
    void sendToConverter(audioPacket audio);


private:

    //qint64 readData(char* data, qint64 nBytes);
    //qint64 writeData(const char* data, qint64 nBytes);


    bool            isUnderrun = false;
    bool            isOverrun = false;
    bool            isInitialized=false;
    bool            isReady = false;
    bool            audioBuffered = false;

    QIODevice* audioDevice=Q_NULLPTR;

    QAudioFormat     radioFormat;
    QAudioFormat     nativeFormat;
#if (QT_VERSION < QT_VERSION_CHECK(6,0,0))
    QAudioOutput* audioOutput = Q_NULLPTR;
    QAudioInput* audioInput = Q_NULLPTR;
    QAudioDeviceInfo deviceInfo;
#else
    QAudioSink* audioOutput = Q_NULLPTR;
    QAudioSource* audioInput = Q_NULLPTR;
    QAudioDevice deviceInfo;
#endif

    audioConverter* converter=Q_NULLPTR;
    QThread* converterThread = Q_NULLPTR;
    QTime lastReceived;
    //r8b::CFixedBuffer<double>* resampBufs;
    //r8b::CPtrKeeper<r8b::CDSPResampler24*>* resamps;

    quint16         audioLatency;

    quint32         lastSeq;
    quint32         lastSentSeq=0;
    qint64          elapsedMs = 0;
        
    int             delayedPackets=0;

    double resampleRatio;

    volatile bool ready = false;
    audioPacket tempBuf;
    quint16 currentLatency;
    float amplitude=0.0;
    qreal volume = 1.0;

    audioSetup setup;

    OpusEncoder* encoder = Q_NULLPTR;
    OpusDecoder* decoder = Q_NULLPTR;
    QTimer* underTimer;
    codecType codec;
};


#endif // AUDIOHANDLER_H