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  • python/lib/aubio/midiconv.py

    r476cb41 ra3e152a  
    22""" utilities to convert midi note number to and from note names """
    33
    4 __all__ = ['note2midi', 'midi2note', 'freq2note', 'note2freq']
    5 
    64import sys
    75from ._aubio import freqtomidi, miditofreq
     6
     7__all__ = ['note2midi', 'midi2note', 'freq2note', 'note2freq']
    88
    99py3 = sys.version_info[0] == 3
     
    1515    int_instances = (int, long)
    1616
     17
    1718def 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}
    2061    _valid_modifiers = {
    21             u'𝄫': -2,                        # double flat
    22             u'♭': -1, 'b': -1, '\u266d': -1, # simple flat
    23             u'♮': 0, '\u266e': 0, None: 0,   # natural
    24             '#': +1, u'♯': +1, '\u266f': +1, # sharp
    25             u'𝄪': +2,                        # double sharp
     62            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
    2667            }
    2768    _valid_octaves = range(-1, 10)
     
    3273        msg = "string of 2 to 4 characters expected, got {:d} ({:s})"
    3374        raise ValueError(msg.format(len(note), note))
    34     notename, modifier, octave = [None]*3
     75    notename, modifier, octave = [None] * 3
    3576
    3677    if len(note) == 4:
     
    5596        raise ValueError("%s is not a valid octave" % octave)
    5697
    57     midi = 12 + octave * 12 + _valid_notenames[notename] \
    58             + _valid_modifiers[modifier]
     98    midi = (octave + 1) * 12 + _valid_notenames[notename] \
     99                             + _valid_modifiers[modifier]
    59100    if midi > 127:
    60101        raise ValueError("%s is outside of the range C-2 to G8" % note)
    61102    return midi
    62103
     104
    63105def 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    """
    65136    if not isinstance(midi, int_instances):
    66137        raise TypeError("an integer is required, got %s" % midi)
     
    69140        raise ValueError(msg.format(midi))
    70141    _valid_notenames = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#',
    71             'A', 'A#', 'B']
     142                        'A', 'A#', 'B']
    72143    return _valid_notenames[midi % 12] + str(int(midi / 12) - 1)
    73144
     145
    74146def 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    """
    76166    nearest_note = int(freqtomidi(freq) + .5)
    77167    return midi2note(nearest_note)
     168
    78169
    79170def note2freq(note):
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