-
Notifications
You must be signed in to change notification settings - Fork 86
/
chord_recognition.py
188 lines (181 loc) · 7.38 KB
/
chord_recognition.py
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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
import miditoolkit
import numpy as np
class MIDIChord(object):
def __init__(self):
# define pitch classes
self.PITCH_CLASSES = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']
# define chord maps (required)
self.CHORD_MAPS = {'maj': [0, 4],
'min': [0, 3],
'dim': [0, 3, 6],
'aug': [0, 4, 8],
'dom': [0, 4, 7, 10]}
# define chord insiders (+1)
self.CHORD_INSIDERS = {'maj': [7],
'min': [7],
'dim': [9],
'aug': [],
'dom': []}
# define chord outsiders (-1)
self.CHORD_OUTSIDERS_1 = {'maj': [2, 5, 9],
'min': [2, 5, 8],
'dim': [2, 5, 10],
'aug': [2, 5, 9],
'dom': [2, 5, 9]}
# define chord outsiders (-2)
self.CHORD_OUTSIDERS_2 = {'maj': [1, 3, 6, 8, 10],
'min': [1, 4, 6, 9, 11],
'dim': [1, 4, 7, 8, 11],
'aug': [1, 3, 6, 7, 10],
'dom': [1, 3, 6, 8, 11]}
def note2pianoroll(self, notes, max_tick, ticks_per_beat):
return miditoolkit.pianoroll.parser.notes2pianoroll(
note_stream_ori=notes,
max_tick=max_tick,
ticks_per_beat=ticks_per_beat)
def sequencing(self, chroma):
candidates = {}
for index in range(len(chroma)):
if chroma[index]:
root_note = index
_chroma = np.roll(chroma, -root_note)
sequence = np.where(_chroma == 1)[0]
candidates[root_note] = list(sequence)
return candidates
def scoring(self, candidates):
scores = {}
qualities = {}
for root_note, sequence in candidates.items():
if 3 not in sequence and 4 not in sequence:
scores[root_note] = -100
qualities[root_note] = 'None'
elif 3 in sequence and 4 in sequence:
scores[root_note] = -100
qualities[root_note] = 'None'
else:
# decide quality
if 3 in sequence:
if 6 in sequence:
quality = 'dim'
else:
quality = 'min'
elif 4 in sequence:
if 8 in sequence:
quality = 'aug'
else:
if 7 in sequence and 10 in sequence:
quality = 'dom'
else:
quality = 'maj'
# decide score
maps = self.CHORD_MAPS.get(quality)
_notes = [n for n in sequence if n not in maps]
score = 0
for n in _notes:
if n in self.CHORD_OUTSIDERS_1.get(quality):
score -= 1
elif n in self.CHORD_OUTSIDERS_2.get(quality):
score -= 2
elif n in self.CHORD_INSIDERS.get(quality):
score += 1
scores[root_note] = score
qualities[root_note] = quality
return scores, qualities
def find_chord(self, pianoroll):
chroma = miditoolkit.pianoroll.utils.tochroma(pianoroll=pianoroll)
chroma = np.sum(chroma, axis=0)
chroma = np.array([1 if c else 0 for c in chroma])
if np.sum(chroma) == 0:
return 'N', 'N', 'N', 0
else:
candidates = self.sequencing(chroma=chroma)
scores, qualities = self.scoring(candidates=candidates)
# bass note
sorted_notes = []
for i, v in enumerate(np.sum(pianoroll, axis=0)):
if v > 0:
sorted_notes.append(int(i%12))
bass_note = sorted_notes[0]
# root note
__root_note = []
_max = max(scores.values())
for _root_note, score in scores.items():
if score == _max:
__root_note.append(_root_note)
if len(__root_note) == 1:
root_note = __root_note[0]
else:
#TODO: what should i do
for n in sorted_notes:
if n in __root_note:
root_note = n
break
# quality
quality = qualities.get(root_note)
sequence = candidates.get(root_note)
# score
score = scores.get(root_note)
return self.PITCH_CLASSES[root_note], quality, self.PITCH_CLASSES[bass_note], score
def greedy(self, candidates, max_tick, min_length):
chords = []
# start from 0
start_tick = 0
while start_tick < max_tick:
_candidates = candidates.get(start_tick)
_candidates = sorted(_candidates.items(), key=lambda x: (x[1][-1], x[0]))
# choose
end_tick, (root_note, quality, bass_note, _) = _candidates[-1]
if root_note == bass_note:
chord = '{}:{}'.format(root_note, quality)
else:
chord = '{}:{}/{}'.format(root_note, quality, bass_note)
chords.append([start_tick, end_tick, chord])
start_tick = end_tick
# remove :None
temp = chords
while ':None' in temp[0][-1]:
try:
temp[1][0] = temp[0][0]
del temp[0]
except:
print('NO CHORD')
return []
temp2 = []
for chord in temp:
if ':None' not in chord[-1]:
temp2.append(chord)
else:
temp2[-1][1] = chord[1]
return temp2
def extract(self, notes):
# read
max_tick = max([n.end for n in notes])
ticks_per_beat = 480
pianoroll = self.note2pianoroll(
notes=notes,
max_tick=max_tick,
ticks_per_beat=ticks_per_beat)
# get lots of candidates
candidates = {}
# the shortest: 2 beat, longest: 4 beat
for interval in [4, 2]:
for start_tick in range(0, max_tick, ticks_per_beat):
# set target pianoroll
end_tick = int(ticks_per_beat * interval + start_tick)
if end_tick > max_tick:
end_tick = max_tick
_pianoroll = pianoroll[start_tick:end_tick, :]
# find chord
root_note, quality, bass_note, score = self.find_chord(pianoroll=_pianoroll)
# save
if start_tick not in candidates:
candidates[start_tick] = {}
candidates[start_tick][end_tick] = (root_note, quality, bass_note, score)
else:
if end_tick not in candidates[start_tick]:
candidates[start_tick][end_tick] = (root_note, quality, bass_note, score)
# greedy
chords = self.greedy(candidates=candidates,
max_tick=max_tick,
min_length=ticks_per_beat)
return chords