1 # -*- coding: utf-8 -*-
4 " convert note name to midi note number, e.g. [C-1, G9] -> [0, 127] "
5 _valid_notenames = {'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 'A': 9, 'B': 11}
6 _valid_modifiers = {None: 0, u'♮': 0, '#': +1, u'♯': +1, u'\udd2a': +2, 'b': -1, u'♭': -1, u'\ufffd': -2}
7 _valid_octaves = range(-1, 10)
8 if type(note) not in (str, unicode):
9 raise TypeError("a string is required, got %s" % note)
10 if not (1 < len(note) < 5):
12 "string of 2 to 4 characters expected, got %d (%s)" %
14 notename, modifier, octave = [None]*3
17 notename, modifier, octave_sign, octave = note
18 octave = octave_sign + octave
20 notename, modifier, octave = note
22 octave = modifier + octave
25 notename, octave = note
27 notename = notename.upper()
30 if notename not in _valid_notenames:
31 raise ValueError("%s is not a valid note name" % notename)
32 if modifier not in _valid_modifiers:
33 raise ValueError("%s is not a valid modifier" % modifier)
34 if octave not in _valid_octaves:
35 raise ValueError("%s is not a valid octave" % octave)
37 midi = 12 + octave * 12 + _valid_notenames[notename] + _valid_modifiers[modifier]
39 raise ValueError("%s is outside of the range C-2 to G8" % note)
43 " convert midi note number to note name, e.g. [0, 127] -> [C-1, G9] "
45 raise TypeError("an integer is required, got %s" % midi)
46 if not (-1 < midi < 128):
48 "an integer between 0 and 127 is excepted, got %d" % midi)
50 _valid_notenames = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']
51 return _valid_notenames[midi % 12] + str( midi / 12 - 1)
54 from aubio import freqtomidi
55 return midi2note(int(freqtomidi(freq)))