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
|
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVisualization module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/
#ifndef SPECTRUM_H
#define SPECTRUM_H
#include "utils.h"
#include "fftreal_wrapper.h" // For FFTLengthPowerOfTwo
#include <qglobal.h>
//-----------------------------------------------------------------------------
// Constants
//-----------------------------------------------------------------------------
// Number of audio samples used to calculate the frequency spectrum
const int SpectrumLengthSamples = PowerOfTwo<FFTLengthPowerOfTwo>::Result;
// Number of bands in the frequency spectrum
const int SpectrumNumBands = 30;
// Lower bound of first band in the spectrum
const qreal SpectrumLowFreq = 0.0; // Hz
// Upper band of last band in the spectrum
const qreal SpectrumHighFreq = 1000.0; // Hz
// Waveform window size in microseconds
const qint64 WaveformWindowDuration = 500 * 1000;
// Fudge factor used to calculate the spectrum bar heights
const qreal SpectrumAnalyserMultiplier = 0.15;
// Disable message timeout
const int NullMessageTimeout = -1;
//-----------------------------------------------------------------------------
// Types and data structures
//-----------------------------------------------------------------------------
enum WindowFunction {
NoWindow,
HannWindow
};
const WindowFunction DefaultWindowFunction = HannWindow;
struct Tone
{
Tone(qreal freq = 0.0, qreal amp = 0.0)
: frequency(freq), amplitude(amp)
{ }
// Start and end frequencies for swept tone generation
qreal frequency;
// Amplitude in range [0.0, 1.0]
qreal amplitude;
};
struct SweptTone
{
SweptTone(qreal start = 0.0, qreal end = 0.0, qreal amp = 0.0)
: startFreq(start), endFreq(end), amplitude(amp)
{ Q_ASSERT(end >= start); }
SweptTone(const Tone &tone)
: startFreq(tone.frequency), endFreq(tone.frequency), amplitude(tone.amplitude)
{ }
// Start and end frequencies for swept tone generation
qreal startFreq;
qreal endFreq;
// Amplitude in range [0.0, 1.0]
qreal amplitude;
};
//-----------------------------------------------------------------------------
// Macros
//-----------------------------------------------------------------------------
// Macro which connects a signal to a slot, and which causes application to
// abort if the connection fails. This is intended to catch programming errors
// such as mis-typing a signal or slot name. It is necessary to write our own
// macro to do this - the following idiom
// Q_ASSERT(connect(source, signal, receiver, slot));
// will not work because Q_ASSERT compiles to a no-op in release builds.
#define CHECKED_CONNECT(source, signal, receiver, slot) \
if (!connect(source, signal, receiver, slot)) \
qt_assert_x(Q_FUNC_INFO, "CHECKED_CONNECT failed", __FILE__, __LINE__);
#endif // SPECTRUM_H
|