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audiooutput.h Example File
multimedia/audiooutput/audiooutput.h

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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);
 };