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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);
     };