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50
51#ifndef AUDIOINPUT_H
52#define AUDIOINPUT_H
53
54#include <QAudioInput>
55#include <QByteArray>
56#include <QComboBox>
57#include <QMainWindow>
58#include <QObject>
59#include <QPixmap>
60#include <QPushButton>
61#include <QSlider>
62#include <QWidget>
63#include <QScopedPointer>
64
65class AudioInfo : public QIODevice
66{
67 Q_OBJECT
68
69public:
70 AudioInfo(const QAudioFormat &format);
71
72 void start();
73 void stop();
74
75 qreal level() const { return m_level; }
76
77 qint64 readData(char *data, qint64 maxlen) override;
78 qint64 writeData(const char *data, qint64 len) override;
79
80private:
81 const QAudioFormat m_format;
82 quint32 m_maxAmplitude = 0;
83 qreal m_level = 0.0; // 0.0 <= m_level <= 1.0
84
85signals:
86 void update();
87};
88
89
90class RenderArea : public QWidget
91{
92 Q_OBJECT
93
94public:
95 explicit RenderArea(QWidget *parent = nullptr);
96
97 void setLevel(qreal value);
98
99protected:
100 void paintEvent(QPaintEvent *event) override;
101
102private:
103 qreal m_level = 0;
104 QPixmap m_pixmap;
105};
106
107
108class InputTest : public QMainWindow
109{
110 Q_OBJECT
111
112public:
113 InputTest();
114
115private:
116 void initializeWindow();
117 void initializeAudio(const QAudioDeviceInfo &deviceInfo);
118
119private slots:
120 void toggleMode();
121 void toggleSuspend();
122 void deviceChanged(int index);
123 void sliderChanged(int value);
124
125private:
126 // Owned by layout
127 RenderArea *m_canvas = nullptr;
128 QPushButton *m_modeButton = nullptr;
129 QPushButton *m_suspendResumeButton = nullptr;
130 QComboBox *m_deviceBox = nullptr;
131 QSlider *m_volumeSlider = nullptr;
132
133 QScopedPointer<AudioInfo> m_audioInfo;
134 QScopedPointer<QAudioInput> m_audioInput;
135 bool m_pullMode = true;
136};
137
138#endif // AUDIOINPUT_H
139

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