1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <math.h>
#include <QObject>
#include <QMainWindow>
#include <QIODevice>
#include <QTimer>
#include <QPushButton>
#include <QComboBox>
#include <QByteArray>
#include <QAudioOutput>
class Generator : public QIODevice
{
Q_OBJECT
public:
Generator(const QAudioFormat &format, qint64 durationUs, int frequency, QObject *parent);
~Generator();
void start();
void stop();
qint64 readData(char *data, qint64 maxlen);
qint64 writeData(const char *data, qint64 len);
qint64 bytesAvailable() const;
private:
void generateData(const QAudioFormat &format, qint64 durationUs, int frequency);
private:
qint64 m_pos;
QByteArray m_buffer;
};
class AudioTest : public QMainWindow
{
Q_OBJECT
public:
AudioTest();
~AudioTest();
private:
void initializeWindow();
void initializeAudio();
void createAudioOutput();
private:
QTimer* m_timer;
// Owned by layout
QPushButton* m_modeButton;
QPushButton* m_suspendResumeButton;
QComboBox* m_deviceBox;
QAudioDeviceInfo m_device;
Generator* m_generator;
QAudioOutput* m_audioOutput;
QIODevice* m_output; // not owned
QAudioFormat m_format;
bool m_pullMode;
QByteArray m_buffer;
static const QString PushModeLabel;
static const QString PullModeLabel;
static const QString SuspendLabel;
static const QString ResumeLabel;
private slots:
void status();
void writeMore();
void toggle();
void togglePlay();
void state(QAudio::State s);
void deviceChanged(int idx);
};
|
