scripts/musicxml2ly.py

   1 import sys
   2 import re
   3 import os
   4
   5 datadir = '@local_lilypond_datadir@'
   6 if not os.path.isdir (datadir):
   7         datadir = '@lilypond_datadir@'
   8 if os.environ.has_key ('LILYPONDPREFIX'):
   9         datadir = os.environ['LILYPONDPREFIX']
  10         while datadir[-1] == os.sep:
  11                 datadir = datadir[:-1]
  12
  13 if os.path.exists (os.path.join (datadir, 'share/lilypond/@TOPLEVEL_VERSION@/')):
  14         datadir = os.path.join (datadir, 'share/lilypond/@TOPLEVEL_VERSION@/')
  15 elif os.path.exists (os.path.join (datadir, 'share/lilypond/current/')):
  16         datadir = os.path.join (datadir, 'share/lilypond/current/')
  17
  18 sys.path.insert (0, os.path.join (datadir, 'python'))
  19
  20 import musicxml
  21 import musicexp
  22 from rational import Rational
  23
  24 def musicxml_duration_to_lily (mxl_note):
  25         d = musicexp.Duration ()
  26         if mxl_note.get_maybe_exist_typed_child (musicxml.Type):
  27                 d.duration_log = mxl_note.get_duration_log ()
  28         else:
  29                 d.factor = mxl_note._duration
  30                 d.duration_log = 0
  31
  32         d.dots = len (mxl_note.get_typed_children (musicxml.Dot))
  33         d.factor = mxl_note._duration / d.get_length ()
  34
  35         return d
  36
  37 def musicxml_voice_to_lily_voice (voice):
  38
  39         ly_voice = []
  40         ly_now = Rational (0)
  41         for n in voice:
  42                 if not n.__class__.__name__ == 'Note':
  43                         print 'not a note?'
  44                         continue
  45
  46                 pitch  = None
  47                 duration = None
  48
  49                 mxl_pitch = n.get_maybe_exist_typed_child (musicxml.Pitch)
  50                 event = None
  51
  52                 if mxl_pitch:
  53                         pitch = musicxml_pitch_to_lily (mxl_pitch)
  54                         event = musicexp.NoteEvent()
  55                         event.pitch = pitch
  56                 elif n.get_maybe_exist_typed_child (musicxml.Rest):
  57                         event = musicexp.RestEvent()
  58
  59                 event.duration = musicxml_duration_to_lily (n)
  60                 ev_chord = None
  61                 if None ==  n.get_maybe_exist_typed_child (musicxml.Chord):
  62                         if ly_voice:
  63                                 ly_now += ly_voice[-1].get_length ()
  64
  65                         if ly_now <> n._when:
  66                                 diff = n._when - ly_now
  67                                 if diff < Rational (0):
  68                                         print 'huh: negative skip', n._when, ly_now, n._duration
  69                                         diff = Rational (1,314159265)
  70
  71
  72                                 skip = musicexp.SkipEvent()
  73                                 skip.duration.duration_log = 0
  74                                 skip.duration.factor = diff
  75
  76                                 evc = musicexp.EventChord ()
  77                                 evc.elements.append (skip)
  78                                 ly_voice.append (evc)
  79                                 ly_now = n._when
  80
  81                         ly_voice.append (musicexp.EventChord())
  82                 else:
  83                         pass
  84                         #print 'append'
  85                 ev_chord = ly_voice[-1]
  86                 ev_chord.elements.append (event)
  87
  88
  89         seq_music = musicexp.SequentialMusic()
  90
  91
  92         seq_music.elements = ly_voice
  93         return seq_music
  94
  95
  96 def musicxml_id_to_lily (id):
  97         digits = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight',
  98                   'nine', 'ten']
  99
 100         for dig in digits:
 101                 d = digits.index (dig) + 1
 102                 dig = dig[0].upper() + dig[1:]
 103                 id = re.sub ('%d' % d, dig, id)
 104
 105         id = re.sub  ('[^a-zA-Z]', 'X', id)
 106         return id
 107
 108
 109 def musicxml_pitch_to_lily (mxl_pitch):
 110         p = musicexp.Pitch()
 111         p.alteration = mxl_pitch.get_alteration ()
 112         p.step = (ord (mxl_pitch.get_step ()) - ord ('A') + 7 - 2) % 7
 113         p.octave = mxl_pitch.get_octave () -4
 114         return p
 115
 116 def get_all_voices (parts):
 117         all_voices = {}
 118         for p in parts:
 119                 p.interpret ()
 120                 p.extract_voices ()
 121                 voice_dict = p.get_voices ()
 122
 123                 for (id, voice) in voice_dict.items ():
 124                         m = musicxml_voice_to_lily_voice (voice)
 125                         m_name = 'Part' + p.name + 'Voice' + id
 126                         m_name = musicxml_id_to_lily (m_name)
 127                         all_voices[m_name] = m
 128
 129         return all_voices
 130
 131 printer = musicexp.Output_printer()
 132
 133
 134 tree = musicxml.read_musicxml (sys.argv[1])
 135 parts = tree.get_typed_children (musicxml.Part)
 136
 137 voices = get_all_voices (parts)
 138 for  (k,v) in voices.items():
 139         print '%s = \n' % k
 140         v.print_ly (printer.dump)
 141         printer.newline()
 142
 143