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50
51#ifndef AUDIOOUTPUT_H
52#define AUDIOOUTPUT_H
53
54#include <math.h>
55
56#include <QAudioOutput>
57#include <QByteArray>
58#include <QComboBox>
59#include <QIODevice>
60#include <QLabel>
61#include <QMainWindow>
62#include <QObject>
63#include <QPushButton>
64#include <QSlider>
65#include <QTimer>
66#include <QScopedPointer>
67
68class Generator : public QIODevice
69{
70 Q_OBJECT
71
72public:
73 Generator(const QAudioFormat &format, qint64 durationUs, int sampleRate);
74
75 void start();
76 void stop();
77
78 qint64 readData(char *data, qint64 maxlen) override;
79 qint64 writeData(const char *data, qint64 len) override;
80 qint64 bytesAvailable() const override;
81
82private:
83 void generateData(const QAudioFormat &format, qint64 durationUs, int sampleRate);
84
85private:
86 qint64 m_pos = 0;
87 QByteArray m_buffer;
88};
89
90class AudioTest : public QMainWindow
91{
92 Q_OBJECT
93
94public:
95 AudioTest();
96 ~AudioTest();
97
98private:
99 void initializeWindow();
100 void initializeAudio(const QAudioDeviceInfo &deviceInfo);
101
102private:
103 QTimer *m_pushTimer = nullptr;
104
105 // Owned by layout
106 QPushButton *m_modeButton = nullptr;
107 QPushButton *m_suspendResumeButton = nullptr;
108 QComboBox *m_deviceBox = nullptr;
109 QLabel *m_volumeLabel = nullptr;
110 QSlider *m_volumeSlider = nullptr;
111
112 QScopedPointer<Generator> m_generator;
113 QScopedPointer<QAudioOutput> m_audioOutput;
114
115 bool m_pullMode = true;
116
117private slots:
118 void toggleMode();
119 void toggleSuspendResume();
120 void deviceChanged(int index);
121 void volumeChanged(int);
122};
123
124#endif // AUDIOOUTPUT_H
125

source code of qtmultimedia/examples/multimedia/audiooutput/audiooutput.h