Changes in python/lib/aubio/midiconv.py [476cb41:a3e152a]
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python/lib/aubio/midiconv.py
r476cb41 ra3e152a 2 2 """ utilities to convert midi note number to and from note names """ 3 3 4 __all__ = ['note2midi', 'midi2note', 'freq2note', 'note2freq']5 6 4 import sys 7 5 from ._aubio import freqtomidi, miditofreq 6 7 __all__ = ['note2midi', 'midi2note', 'freq2note', 'note2freq'] 8 8 9 9 py3 = sys.version_info[0] == 3 … … 15 15 int_instances = (int, long) 16 16 17 17 18 def note2midi(note): 18 " convert note name to midi note number, e.g. [C-1, G9] -> [0, 127] " 19 _valid_notenames = {'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 'A': 9, 'B': 11} 19 """Convert note name to midi note number. 20 21 Input string `note` should be composed of one note root 22 and one octave, with optionally one modifier in between. 23 24 List of valid components: 25 26 - note roots: `C`, `D`, `E`, `F`, `G`, `A`, `B`, 27 - modifiers: `b`, `#`, as well as unicode characters 28 `𝄫`, `♭`, `♮`, `♯` and `𝄪`, 29 - octave numbers: `-1` -> `11`. 30 31 Parameters 32 ---------- 33 note : str 34 note name 35 36 Returns 37 ------- 38 int 39 corresponding midi note number 40 41 Examples 42 -------- 43 >>> aubio.note2midi('C#4') 44 61 45 >>> aubio.note2midi('B♭5') 46 82 47 48 Raises 49 ------ 50 TypeError 51 If `note` was not a string. 52 ValueError 53 If an error was found while converting `note`. 54 55 See Also 56 -------- 57 midi2note, freqtomidi, miditofreq 58 """ 59 _valid_notenames = {'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 60 'A': 9, 'B': 11} 20 61 _valid_modifiers = { 21 u'𝄫': -2, # double flat22 u'♭': -1, 'b': -1, '\u266d': -1, # simple flat23 u'♮': 0, '\u266e': 0, None: 0, # natural24 '#': +1, u'♯': +1, '\u266f': +1, # sharp25 u'𝄪': +2, # double sharp62 u'𝄫': -2, # double flat 63 u'♭': -1, 'b': -1, '\u266d': -1, # simple flat 64 u'♮': 0, '\u266e': 0, None: 0, # natural 65 '#': +1, u'♯': +1, '\u266f': +1, # sharp 66 u'𝄪': +2, # double sharp 26 67 } 27 68 _valid_octaves = range(-1, 10) … … 32 73 msg = "string of 2 to 4 characters expected, got {:d} ({:s})" 33 74 raise ValueError(msg.format(len(note), note)) 34 notename, modifier, octave = [None] *375 notename, modifier, octave = [None] * 3 35 76 36 77 if len(note) == 4: … … 55 96 raise ValueError("%s is not a valid octave" % octave) 56 97 57 midi = 12 + octave* 12 + _valid_notenames[notename] \58 + _valid_modifiers[modifier]98 midi = (octave + 1) * 12 + _valid_notenames[notename] \ 99 + _valid_modifiers[modifier] 59 100 if midi > 127: 60 101 raise ValueError("%s is outside of the range C-2 to G8" % note) 61 102 return midi 62 103 104 63 105 def midi2note(midi): 64 " convert midi note number to note name, e.g. [0, 127] -> [C-1, G9] " 106 """Convert midi note number to note name. 107 108 Parameters 109 ---------- 110 midi : int [0, 128] 111 input midi note number 112 113 Returns 114 ------- 115 str 116 note name 117 118 Examples 119 -------- 120 >>> aubio.midi2note(70) 121 'A#4' 122 >>> aubio.midi2note(59) 123 'B3' 124 125 Raises 126 ------ 127 TypeError 128 If `midi` was not an integer. 129 ValueError 130 If `midi` is out of the range `[0, 128]`. 131 132 See Also 133 -------- 134 note2midi, miditofreq, freqtomidi 135 """ 65 136 if not isinstance(midi, int_instances): 66 137 raise TypeError("an integer is required, got %s" % midi) … … 69 140 raise ValueError(msg.format(midi)) 70 141 _valid_notenames = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 71 'A', 'A#', 'B']142 'A', 'A#', 'B'] 72 143 return _valid_notenames[midi % 12] + str(int(midi / 12) - 1) 73 144 145 74 146 def freq2note(freq): 75 " convert frequency in Hz to nearest note name, e.g. [0, 22050.] -> [C-1, G9] " 147 """Convert frequency in Hz to nearest note name. 148 149 Parameters 150 ---------- 151 freq : float [0, 23000[ 152 input frequency, in Hz 153 154 Returns 155 ------- 156 str 157 name of the nearest note 158 159 Example 160 ------- 161 >>> aubio.freq2note(440) 162 'A4' 163 >>> aubio.freq2note(220.1) 164 'A3' 165 """ 76 166 nearest_note = int(freqtomidi(freq) + .5) 77 167 return midi2note(nearest_note) 168 78 169 79 170 def note2freq(note):
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