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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
#pragma once
#include <QMutex>
#include <QString>
#include <QList>
#include "control/controlproxy.h"
#include "proto/keys.pb.h"
#include "track/keys.h"
#include "util/math.h"
class KeyUtils {
public:
enum class KeyNotation {
Invalid = 0,
Custom = 1,
OpenKey = 2,
Lancelot = 3,
Traditional = 4,
OpenKeyAndTraditional = 5,
LancelotAndTraditional = 6,
NumKeyNotations = 7
};
static QString keyDebugName(mixxx::track::io::key::ChromaticKey key);
static inline bool keyIsMajor(mixxx::track::io::key::ChromaticKey key) {
return key > mixxx::track::io::key::INVALID &&
key < mixxx::track::io::key::C_MINOR;
}
// Returns the tonic, 0-indexed.
static inline int keyToTonic(mixxx::track::io::key::ChromaticKey key) {
if (key == mixxx::track::io::key::INVALID) {
return mixxx::track::io::key::INVALID;
}
return static_cast<int>(key) - (keyIsMajor(key) ? 1 : 13);
}
// Takes a 0-indexed tonic and whether it is major/minor and produces a key.
static inline mixxx::track::io::key::ChromaticKey tonicToKey(int tonic, bool major) {
return static_cast<mixxx::track::io::key::ChromaticKey>(
tonic + (major ? 1 : 13));
}
static QString keyToString(mixxx::track::io::key::ChromaticKey key,
KeyNotation notation = KeyNotation::Custom);
static QString getGlobalKeyText(
const Keys& keys,
KeyNotation notation = KeyNotation::Custom);
static mixxx::track::io::key::ChromaticKey keyFromNumericValue(double value);
static KeyNotation keyNotationFromNumericValue(double value);
static double keyToNumericValue(mixxx::track::io::key::ChromaticKey key);
static QPair<mixxx::track::io::key::ChromaticKey, double> scaleKeyOctaves(
mixxx::track::io::key::ChromaticKey key, double scale);
static mixxx::track::io::key::ChromaticKey scaleKeySteps(
mixxx::track::io::key::ChromaticKey key, int steps);
static inline double stepsToOctaveChange(int steps) {
return static_cast<double>(steps) / 12.0;
}
static int shortestStepsToKey(mixxx::track::io::key::ChromaticKey key,
mixxx::track::io::key::ChromaticKey target_key);
static int shortestStepsToCompatibleKey(mixxx::track::io::key::ChromaticKey key,
mixxx::track::io::key::ChromaticKey target_key);
// Returns a list of keys that are harmonically compatible with key using
// the Circle of Fifths (including the key itself).
static QList<mixxx::track::io::key::ChromaticKey> getCompatibleKeys(
mixxx::track::io::key::ChromaticKey key);
static mixxx::track::io::key::ChromaticKey guessKeyFromText(const QString& text);
static mixxx::track::io::key::ChromaticKey calculateGlobalKey(
const KeyChangeList& key_changes, int iTotalSamples, int iSampleRate);
static void setNotation(
const QMap<mixxx::track::io::key::ChromaticKey, QString>& notation);
// Returns pow(2, octaveChange)
static inline double octaveChangeToPowerOf2(const double& octaveChange) {
// Some libraries (e.g. SoundTouch) calculate pow(2, octaveChange)
// using this identity:
// x^y = e^(y*ln(x))
// Presumably because exp() is faster than pow() on some machines.
// TODO(rryan) benchmark on Intel / AMD / ARM processors and pick accordingly.
//static const lg2 = log(2); // 0.69314718056f
//return exp(lg2 * octaveChange);
return pow(2.0, octaveChange);
}
static inline double semitoneChangeToPowerOf2(const double& semitones) {
return octaveChangeToPowerOf2(semitones / 12);
}
static inline double powerOf2ToOctaveChange(const double& power_of_2) {
return log2(power_of_2);
}
static inline double powerOf2ToSemitoneChange(const double& power_of_2) {
return powerOf2ToOctaveChange(power_of_2) * 12;
}
static mixxx::track::io::key::ChromaticKey openKeyNumberToKey(int openKeyNumber, bool major);
static inline int keyToOpenKeyNumber(mixxx::track::io::key::ChromaticKey key) {
switch (key) {
case mixxx::track::io::key::C_MAJOR:
case mixxx::track::io::key::A_MINOR:
return 1;
case mixxx::track::io::key::G_MAJOR:
case mixxx::track::io::key::E_MINOR:
return 2;
case mixxx::track::io::key::D_MAJOR:
case mixxx::track::io::key::B_MINOR:
return 3;
case mixxx::track::io::key::A_MAJOR:
case mixxx::track::io::key::F_SHARP_MINOR:
return 4;
case mixxx::track::io::key::E_MAJOR:
case mixxx::track::io::key::C_SHARP_MINOR:
return 5;
case mixxx::track::io::key::B_MAJOR:
case mixxx::track::io::key::G_SHARP_MINOR:
return 6;
case mixxx::track::io::key::F_SHARP_MAJOR:
case mixxx::track::io::key::E_FLAT_MINOR:
return 7;
case mixxx::track::io::key::D_FLAT_MAJOR:
case mixxx::track::io::key::B_FLAT_MINOR:
return 8;
case mixxx::track::io::key::A_FLAT_MAJOR:
case mixxx::track::io::key::F_MINOR:
return 9;
case mixxx::track::io::key::E_FLAT_MAJOR:
case mixxx::track::io::key::C_MINOR:
return 10;
case mixxx::track::io::key::B_FLAT_MAJOR:
case mixxx::track::io::key::G_MINOR:
return 11;
case mixxx::track::io::key::F_MAJOR:
case mixxx::track::io::key::D_MINOR:
return 12;
default:
return 0;
}
}
static int keyToCircleOfFifthsOrder(mixxx::track::io::key::ChromaticKey key,
KeyNotation notation);
private:
static QMutex s_notationMutex;
static QMap<mixxx::track::io::key::ChromaticKey, QString> s_notation;
static QMap<QString, mixxx::track::io::key::ChromaticKey> s_reverseNotation;
};
|
