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| @@ -1,23 +1,26 @@ | |||
| 1 | # -*- coding: utf-8 -*- | 1 | # -*- coding: utf-8 -*- |
| 2 | """ utilities to convert midi note number to and from note names """ | ||
| 2 | 3 | ||
| 3 | import sys | 4 | import sys |
| 4 | PY3 = sys.version_info[0] == 3 | 5 | py3 = sys.version_info[0] == 3 |
| 5 | if PY3: | 6 | if py3: |
| 6 | string_types = [str] | 7 | str_instances = [str] |
| 8 | int_instances = [int] | ||
| 7 | else: | 9 | else: |
| 8 | string_types = [str, unicode] | 10 | str_instances = [str, unicode] |
| 11 | int_instances = [int, long] | ||
| 9 | 12 | ||
| 10 | def note2midi(note): | 13 | def note2midi(note): |
| 11 | " convert note name to midi note number, e.g. [C-1, G9] -> [0, 127] " | 14 | " convert note name to midi note number, e.g. [C-1, G9] -> [0, 127] " |
| 12 | _valid_notenames = {'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 'A': 9, 'B': 11} | 15 | _valid_notenames = {'C': 0, 'D': 2, 'E': 4, 'F': 5, 'G': 7, 'A': 9, 'B': 11} |
| 13 | _valid_modifiers = {None: 0, u'♮': 0, '#': +1, u'♯': +1, u'\udd2a': +2, 'b': -1, u'♭': -1, u'\ufffd': -2} | 16 | _valid_modifiers = {None: 0, u'♮': 0, '#': +1, u'♯': +1, u'\udd2a': +2, |
| 17 | 'b': -1, u'♭': -1, u'\ufffd': -2} | ||
| 14 | _valid_octaves = range(-1, 10) | 18 | _valid_octaves = range(-1, 10) |
| 15 | if type(note) not in string_types: | 19 | if isinstance(note, str_instances): |
| 16 | raise TypeError("a string is required, got %s (%s)" % (note, str(type(note)) )) | 20 | raise TypeError("a string is required, got %s (%s)" % (note, str(type(note)))) |
| 17 | if not (1 < len(note) < 5): | 21 | if len(note) not in range(2, 5): |
| 18 | raise ValueError( | 22 | raise ValueError("string of 2 to 4 characters expected, got %d (%s)" \ |
| 19 | "string of 2 to 4 characters expected, got %d (%s)" % | 23 | % (len(note), note)) |
| 20 | (len(note), note)) | ||
| 21 | notename, modifier, octave = [None]*3 | 24 | notename, modifier, octave = [None]*3 |
| 22 | 25 | ||
| 23 | if len(note) == 4: | 26 | if len(note) == 4: |
| @@ -48,15 +51,14 @@ def note2midi(note): · 24 unmodified lines | |||
| 48 | 51 | ||
| 49 | def midi2note(midi): | 52 | def midi2note(midi): |
| 50 | " convert midi note number to note name, e.g. [0, 127] -> [C-1, G9] " | 53 | " convert midi note number to note name, e.g. [0, 127] -> [C-1, G9] " |
| 51 | if type(midi) != int: | 54 | if isinstance(midi, int_instances): |
| 52 | raise TypeError("an integer is required, got %s" % midi) | 55 | raise TypeError("an integer is required, got %s" % midi) |
| 53 | if not (-1 < midi < 128): | 56 | if midi not in range(0, 128): |
| 54 | raise ValueError( | 57 | raise ValueError("an integer between 0 and 127 is excepted, got %d" % midi) |
| 55 | "an integer between 0 and 127 is excepted, got %d" % midi) | ||
| 56 | midi = int(midi) | ||
| 57 | _valid_notenames = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B'] | 58 | _valid_notenames = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B'] |
| 58 | return _valid_notenames[midi % 12] + str( int(midi / 12) - 1 ) | 59 | return _valid_notenames[midi % 12] + str(int(midi / 12) - 1) |
| 59 | 60 | ||
| 60 | def freq2note(freq): | 61 | def freq2note(freq): |
| 62 | " convert frequency in Hz to nearest note name, e.g. [0, 22050.] -> [C-1, G9] " | ||
| 61 | from aubio import freqtomidi | 63 | from aubio import freqtomidi |
| 62 | return midi2note(int(freqtomidi(freq))) | 64 | return midi2note(int(freqtomidi(freq))) |