Chris@49
|
1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
|
Chris@19
|
2
|
Chris@19
|
3 /*
|
Chris@52
|
4 Sonic Visualiser
|
Chris@52
|
5 An audio file viewer and annotation editor.
|
Chris@52
|
6 Centre for Digital Music, Queen Mary, University of London.
|
Chris@52
|
7 This file copyright 2006 Chris Cannam.
|
Chris@19
|
8
|
Chris@52
|
9 This program is free software; you can redistribute it and/or
|
Chris@52
|
10 modify it under the terms of the GNU General Public License as
|
Chris@52
|
11 published by the Free Software Foundation; either version 2 of the
|
Chris@52
|
12 License, or (at your option) any later version. See the file
|
Chris@52
|
13 COPYING included with this distribution for more information.
|
Chris@19
|
14 */
|
Chris@19
|
15
|
Chris@19
|
16 #include "Pitch.h"
|
Chris@141
|
17 #include "Preferences.h"
|
Chris@573
|
18 #include "system/System.h"
|
Chris@19
|
19
|
Chris@19
|
20 #include <cmath>
|
Chris@19
|
21
|
Chris@19
|
22 float
|
Chris@19
|
23 Pitch::getFrequencyForPitch(int midiPitch,
|
Chris@19
|
24 float centsOffset,
|
Chris@19
|
25 float concertA)
|
Chris@19
|
26 {
|
Chris@141
|
27 if (concertA <= 0.0) {
|
Chris@141
|
28 concertA = Preferences::getInstance()->getTuningFrequency();
|
Chris@141
|
29 }
|
Chris@19
|
30 float p = float(midiPitch) + (centsOffset / 100);
|
Chris@19
|
31 return concertA * powf(2.0, (p - 69.0) / 12.0);
|
Chris@19
|
32 }
|
Chris@19
|
33
|
Chris@19
|
34 int
|
Chris@19
|
35 Pitch::getPitchForFrequency(float frequency,
|
Chris@19
|
36 float *centsOffsetReturn,
|
Chris@19
|
37 float concertA)
|
Chris@19
|
38 {
|
Chris@141
|
39 if (concertA <= 0.0) {
|
Chris@141
|
40 concertA = Preferences::getInstance()->getTuningFrequency();
|
Chris@141
|
41 }
|
Chris@19
|
42 float p = 12.0 * (log(frequency / (concertA / 2.0)) / log(2.0)) + 57.0;
|
Chris@19
|
43
|
Chris@19
|
44 int midiPitch = int(p + 0.00001);
|
Chris@19
|
45 float centsOffset = (p - midiPitch) * 100.0;
|
Chris@19
|
46
|
Chris@19
|
47 if (centsOffset >= 50.0) {
|
Chris@19
|
48 midiPitch = midiPitch + 1;
|
Chris@19
|
49 centsOffset = -(100.0 - centsOffset);
|
Chris@19
|
50 }
|
Chris@19
|
51
|
Chris@19
|
52 if (centsOffsetReturn) *centsOffsetReturn = centsOffset;
|
Chris@19
|
53 return midiPitch;
|
Chris@19
|
54 }
|
Chris@19
|
55
|
Chris@373
|
56 int
|
Chris@373
|
57 Pitch::getPitchForFrequencyDifference(float frequencyA,
|
Chris@373
|
58 float frequencyB,
|
Chris@373
|
59 float *centsOffsetReturn,
|
Chris@373
|
60 float concertA)
|
Chris@373
|
61 {
|
Chris@373
|
62 if (concertA <= 0.0) {
|
Chris@373
|
63 concertA = Preferences::getInstance()->getTuningFrequency();
|
Chris@373
|
64 }
|
Chris@373
|
65
|
Chris@373
|
66 if (frequencyA > frequencyB) {
|
Chris@373
|
67 std::swap(frequencyA, frequencyB);
|
Chris@373
|
68 }
|
Chris@373
|
69
|
Chris@373
|
70 float pA = 12.0 * (log(frequencyA / (concertA / 2.0)) / log(2.0)) + 57.0;
|
Chris@373
|
71 float pB = 12.0 * (log(frequencyB / (concertA / 2.0)) / log(2.0)) + 57.0;
|
Chris@373
|
72
|
Chris@373
|
73 float p = pB - pA;
|
Chris@373
|
74
|
Chris@373
|
75 int midiPitch = int(p + 0.00001);
|
Chris@373
|
76 float centsOffset = (p - midiPitch) * 100.0;
|
Chris@373
|
77
|
Chris@373
|
78 if (centsOffset >= 50.0) {
|
Chris@373
|
79 midiPitch = midiPitch + 1;
|
Chris@373
|
80 centsOffset = -(100.0 - centsOffset);
|
Chris@373
|
81 }
|
Chris@373
|
82
|
Chris@373
|
83 if (centsOffsetReturn) *centsOffsetReturn = centsOffset;
|
Chris@373
|
84 return midiPitch;
|
Chris@373
|
85 }
|
Chris@373
|
86
|
Chris@19
|
87 static QString notes[] = {
|
Chris@19
|
88 "C%1", "C#%1", "D%1", "D#%1",
|
Chris@19
|
89 "E%1", "F%1", "F#%1", "G%1",
|
Chris@19
|
90 "G#%1", "A%1", "A#%1", "B%1"
|
Chris@19
|
91 };
|
Chris@19
|
92
|
Chris@26
|
93 static QString flatNotes[] = {
|
Chris@26
|
94 "C%1", "Db%1", "D%1", "Eb%1",
|
Chris@26
|
95 "E%1", "F%1", "Gb%1", "G%1",
|
Chris@26
|
96 "Ab%1", "A%1", "Bb%1", "B%1"
|
Chris@26
|
97 };
|
Chris@26
|
98
|
Chris@1024
|
99 int
|
Chris@1024
|
100 Pitch::getPitchForNoteAndOctave(int note, int octave)
|
Chris@19
|
101 {
|
Chris@892
|
102 int baseOctave = Preferences::getInstance()->getOctaveOfLowestMIDINote();
|
Chris@1024
|
103 return (octave - baseOctave) * 12 + note;
|
Chris@1024
|
104 }
|
Chris@1024
|
105
|
Chris@1024
|
106 void
|
Chris@1024
|
107 Pitch::getNoteAndOctaveForPitch(int midiPitch, int ¬e, int &octave)
|
Chris@1024
|
108 {
|
Chris@1024
|
109 int baseOctave = Preferences::getInstance()->getOctaveOfLowestMIDINote();
|
Chris@1024
|
110
|
Chris@1024
|
111 octave = baseOctave;
|
Chris@892
|
112
|
Chris@892
|
113 // Note, this only gets the right octave number at octave
|
Chris@892
|
114 // boundaries because Cb is enharmonic with B (not B#) and B# is
|
Chris@892
|
115 // enharmonic with C (not Cb). So neither B# nor Cb will be
|
Chris@892
|
116 // spelled from a MIDI pitch + flats flag in isolation.
|
Chris@19
|
117
|
Chris@19
|
118 if (midiPitch < 0) {
|
Chris@19
|
119 while (midiPitch < 0) {
|
Chris@19
|
120 midiPitch += 12;
|
Chris@19
|
121 --octave;
|
Chris@19
|
122 }
|
Chris@19
|
123 } else {
|
Chris@892
|
124 octave = midiPitch / 12 + baseOctave;
|
Chris@19
|
125 }
|
Chris@19
|
126
|
Chris@1024
|
127 note = midiPitch % 12;
|
Chris@1024
|
128 }
|
Chris@1024
|
129
|
Chris@1024
|
130 QString
|
Chris@1024
|
131 Pitch::getPitchLabel(int midiPitch,
|
Chris@1024
|
132 float centsOffset,
|
Chris@1024
|
133 bool useFlats)
|
Chris@1024
|
134 {
|
Chris@1024
|
135 int note, octave;
|
Chris@1024
|
136 getNoteAndOctaveForPitch(midiPitch, note, octave);
|
Chris@1024
|
137
|
Chris@1024
|
138 QString plain = (useFlats ? flatNotes : notes)[note].arg(octave);
|
Chris@19
|
139
|
Chris@19
|
140 int ic = lrintf(centsOffset);
|
Chris@19
|
141 if (ic == 0) return plain;
|
Chris@19
|
142 else if (ic > 0) return QString("%1+%2c").arg(plain).arg(ic);
|
Chris@19
|
143 else return QString("%1%2c").arg(plain).arg(ic);
|
Chris@19
|
144 }
|
Chris@19
|
145
|
Chris@19
|
146 QString
|
Chris@19
|
147 Pitch::getPitchLabelForFrequency(float frequency,
|
Chris@26
|
148 float concertA,
|
Chris@26
|
149 bool useFlats)
|
Chris@19
|
150 {
|
Chris@141
|
151 if (concertA <= 0.0) {
|
Chris@141
|
152 concertA = Preferences::getInstance()->getTuningFrequency();
|
Chris@141
|
153 }
|
Chris@19
|
154 float centsOffset = 0.0;
|
Chris@19
|
155 int midiPitch = getPitchForFrequency(frequency, ¢sOffset, concertA);
|
Chris@26
|
156 return getPitchLabel(midiPitch, centsOffset, useFlats);
|
Chris@19
|
157 }
|
Chris@19
|
158
|
Chris@373
|
159 QString
|
Chris@373
|
160 Pitch::getLabelForPitchRange(int semis, float cents)
|
Chris@373
|
161 {
|
Chris@433
|
162 if (semis > 0) {
|
Chris@433
|
163 while (cents < 0.f) {
|
Chris@433
|
164 --semis;
|
Chris@433
|
165 cents += 100.f;
|
Chris@433
|
166 }
|
Chris@433
|
167 }
|
Chris@433
|
168 if (semis < 0) {
|
Chris@433
|
169 while (cents > 0.f) {
|
Chris@433
|
170 ++semis;
|
Chris@433
|
171 cents -= 100.f;
|
Chris@433
|
172 }
|
Chris@433
|
173 }
|
Chris@433
|
174
|
Chris@373
|
175 int ic = lrintf(cents);
|
Chris@373
|
176
|
Chris@373
|
177 if (ic == 0) {
|
Chris@373
|
178 if (semis >= 12) {
|
Chris@373
|
179 return QString("%1'%2").arg(semis/12).arg(semis - 12*(semis/12));
|
Chris@373
|
180 } else {
|
Chris@373
|
181 return QString("%1").arg(semis);
|
Chris@373
|
182 }
|
Chris@373
|
183 } else {
|
Chris@373
|
184 if (ic > 0) {
|
Chris@373
|
185 if (semis >= 12) {
|
Chris@373
|
186 return QString("%1'%2+%3c").arg(semis/12).arg(semis - 12*(semis/12)).arg(ic);
|
Chris@373
|
187 } else {
|
Chris@373
|
188 return QString("%1+%3c").arg(semis).arg(ic);
|
Chris@373
|
189 }
|
Chris@373
|
190 } else {
|
Chris@373
|
191 if (semis >= 12) {
|
Chris@373
|
192 return QString("%1'%2%3c").arg(semis/12).arg(semis - 12*(semis/12)).arg(ic);
|
Chris@373
|
193 } else {
|
Chris@373
|
194 return QString("%1%3c").arg(semis).arg(ic);
|
Chris@373
|
195 }
|
Chris@373
|
196 }
|
Chris@373
|
197 }
|
Chris@373
|
198 }
|
Chris@373
|
199
|
Chris@274
|
200 bool
|
Chris@274
|
201 Pitch::isFrequencyInMidiRange(float frequency,
|
Chris@274
|
202 float concertA)
|
Chris@274
|
203 {
|
Chris@274
|
204 float centsOffset = 0.0;
|
Chris@274
|
205 int midiPitch = getPitchForFrequency(frequency, ¢sOffset, concertA);
|
Chris@274
|
206 return (midiPitch >= 0 && midiPitch < 128);
|
Chris@274
|
207 }
|
Chris@274
|
208
|