blob: 97dc6e30cc4943bd493d1400b9ba25c98afdb9c6 (
plain)
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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/****************************************************************************
**
** 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 <QtMultimedia/QAudioFormat>
#include "utils.h"
qint64 audioDuration(const QAudioFormat &format, qint64 bytes)
{
return (bytes * 1000000) /
(format.frequency() * format.channels() * (format.sampleSize() / 8));
}
qint64 audioLength(const QAudioFormat &format, qint64 microSeconds)
{
return (format.frequency() * format.channels() * (format.sampleSize() / 8))
* microSeconds / 1000000;
}
qreal nyquistFrequency(const QAudioFormat &format)
{
return format.frequency() / 2;
}
QString formatToString(const QAudioFormat &format)
{
QString result;
if (QAudioFormat() != format) {
if (format.codec() == "audio/pcm") {
Q_ASSERT(format.sampleType() == QAudioFormat::SignedInt);
const QString formatEndian = (format.byteOrder() == QAudioFormat::LittleEndian)
? QString("LE") : QString("BE");
QString formatType;
switch(format.sampleType()) {
case QAudioFormat::SignedInt:
formatType = "signed";
break;
case QAudioFormat::UnSignedInt:
formatType = "unsigned";
break;
case QAudioFormat::Float:
formatType = "float";
break;
case QAudioFormat::Unknown:
formatType = "unknown";
break;
}
QString formatChannels = QString("%1 channels").arg(format.channels());
switch (format.channels()) {
case 1:
formatChannels = "mono";
break;
case 2:
formatChannels = "stereo";
break;
}
result = QString("%1 Hz %2 bit %3 %4 %5")
.arg(format.frequency())
.arg(format.sampleSize())
.arg(formatType)
.arg(formatEndian)
.arg(formatChannels);
} else {
result = format.codec();
}
}
return result;
}
bool isPCM(const QAudioFormat &format)
{
return (format.codec() == "audio/pcm");
}
bool isPCMS16LE(const QAudioFormat &format)
{
return (isPCM(format) &&
format.sampleType() == QAudioFormat::SignedInt &&
format.sampleSize() == 16 &&
format.byteOrder() == QAudioFormat::LittleEndian);
}
const qint16 PCMS16MaxValue = 32767;
const quint16 PCMS16MaxAmplitude = 32768; // because minimum is -32768
qreal pcmToReal(qint16 pcm)
{
return qreal(pcm) / PCMS16MaxAmplitude;
}
qint16 realToPcm(qreal real)
{
return real * PCMS16MaxValue;
}
|
