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#include <math.h>

#define BUFFER_SIZE 32768

#include <QObject>
#include <QMainWindow>
#include <QIODevice>
#include <QTimer>
#include <QPushButton>
#include <QComboBox>

#include <QAudioOutput>

class Generator : public QIODevice
{
    Q_OBJECT
public:
    Generator(QObject *parent);
    ~Generator();

    void start();
    void stop();

    char *t;
    int  len;
    int  pos;
    int  total;
    char *buffer;
    bool finished;
    int  chunk_size;

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

private:
    int putShort(char *t, unsigned int value);
    int fillData(char *start, int frequency, int seconds);
};

class AudioTest : public QMainWindow
{
    Q_OBJECT
public:
    AudioTest();
    ~AudioTest();

    QAudioDeviceInfo  device;
    Generator*        gen;
    QAudioOutput*     audioOutput;
    QIODevice*        output;
    QTimer*           timer;
    QAudioFormat      settings;

    bool              pullMode;
    char*             buffer;

    QPushButton*      button;
    QPushButton*      button2;
    QComboBox*     deviceBox;

private slots:
    void status();
    void writeMore();
    void toggle();
    void togglePlay();
    void state(QAudio::State s);
    void deviceChanged(int idx);
};