src/app/musicxml.py

   1 # -*- coding: utf-8 -*-
   2 """
   3 conversion d'un fichier musicxml en objet song minwii.
   4
   5 $Id$
   6 $URL$
   7 """
   8 import sys
   9 from types import StringTypes
  10 from xml.dom.minidom import parse
  11 from optparse import OptionParser
  12 from itertools import cycle
  13 #from Song import Song
  14
  15 # Do4 <=> midi 60
  16 OCTAVE_REF = 4
  17 DIATO_SCALE = {'C' : 60,
  18                'D' : 62,
  19                'E' : 64,
  20                'F' : 65,
  21                'G' : 67,
  22                'A' : 69,
  23                'B' : 71}
  24
  25 CHROM_SCALE = {  0 : ('C',  0),
  26                  1 : ('C',  1),
  27                  2 : ('D',  0),
  28                  3 : ('E', -1),
  29                  4 : ('E',  0),
  30                  5 : ('F',  0),
  31                  6 : ('F',  1),
  32                  7 : ('G',  0),
  33                  8 : ('G',  1),
  34                  9 : ('A',  0),
  35                 10 : ('B', -1),
  36                 11 : ('B',  0)}
  37
  38
  39 FR_NOTES = {'C' : u'Do',
  40             'D' : u'Ré',
  41             'E' : u'Mi',
  42             'F' : u'Fa',
  43             'G' : u'Sol',
  44             'A' : u'La',
  45             'B' : u'Si'}
  46
  47 _marker = []
  48
  49 class Part(object) :
  50
  51     def __init__(self, node, autoDetectChorus=True) :
  52         self.node = node
  53         self.notes = []
  54         self.repeats = []
  55         self.distinctNotes = []
  56         self._parseMusic()
  57         self.verses = [[]]
  58         self.chorus = []
  59         if autoDetectChorus :
  60             self._findChorus()
  61         self._findVersesLoops()
  62
  63     def _parseMusic(self) :
  64         divisions = 0
  65         previous = None
  66         distinctNotesDict = {}
  67
  68         for measureNode in self.node.getElementsByTagName('measure') :
  69             measureNotes = []
  70
  71             # iteration sur les notes
  72             # divisions de la noire
  73             divisions = int(_getNodeValue(measureNode, 'attributes/divisions', divisions))
  74             for noteNode in measureNode.getElementsByTagName('note') :
  75                 note = Note(noteNode, divisions, previous)
  76                 if not note.isRest :
  77                     measureNotes.append(note)
  78                     if previous :
  79                         previous.next = note
  80                 else :
  81                     previous.addDuration(note)
  82                     continue
  83                 previous = note
  84
  85             self.notes.extend(measureNotes)
  86
  87             for note in measureNotes :
  88                 if not distinctNotesDict.has_key(note.midi) :
  89                     distinctNotesDict[note.midi] = True
  90                     self.distinctNotes.append(note)
  91
  92             # barres de reprises
  93             try :
  94                 barlineNode = measureNode.getElementsByTagName('barline')[0]
  95             except IndexError :
  96                 continue
  97
  98             barline = Barline(barlineNode, measureNotes)
  99             if barline.repeat :
 100                 self.repeats.append(barline)
 101
 102         self.distinctNotes.sort(lambda a, b : cmp(a.midi, b.midi))
 103
 104
 105     def _findChorus(self):
 106         """ le refrain correspond aux notes pour lesquelles
 107             il n'existe q'une seule syllable attachée.
 108         """
 109         start = stop = None
 110         for i, note in enumerate(self.notes) :
 111             ll = len(note.lyrics)
 112             if start is None and ll == 1 :
 113                 start = i
 114             elif start is not None and ll > 1 :
 115                 stop = i
 116                 break
 117         self.chorus = self.notes[start:stop]
 118
 119     def _findVersesLoops(self) :
 120         "recherche des couplets / boucles"
 121         verse = self.verses[0]
 122         for note in self.notes[:-1] :
 123             verse.append(note)
 124             ll = len(note.lyrics)
 125             nll = len(note.next.lyrics)
 126             if ll != nll :
 127                 verse = []
 128                 self.verses.append(verse)
 129         verse.append(self.notes[-1])
 130
 131
 132     def iterNotes(self, indefinitely=True) :
 133         "exécution de la chanson avec l'alternance couplets / refrains"
 134         print 'indefinitely', indefinitely
 135         if indefinitely == False :
 136             iterable = self.verses
 137         else :
 138             iterable = cycle(self.verses)
 139         for verse in iterable :
 140             print "---partie---"
 141             repeats = len(verse[0].lyrics)
 142             if repeats > 1 :
 143                 for i in range(repeats) :
 144                     # couplet
 145                     print "---couplet%d---" % i
 146                     for note in verse :
 147                         yield note, i
 148                     # refrain
 149                     print "---refrain---"
 150                     for note in self.chorus :
 151                         yield note, 0
 152             else :
 153                 for note in verse :
 154                     yield note, 0
 155
 156     def pprint(self) :
 157         for note, verseIndex in self.iterNotes(indefinitely=False) :
 158             print note, note.lyrics[verseIndex]
 159
 160
 161     def assignNotesFromMidiNoteNumbers(self):
 162         # TODO faire le mapping bande hauteur midi
 163         for i in range(len(self.midiNoteNumbers)):
 164             noteInExtendedScale = 0
 165             while self.midiNoteNumbers[i] > self.scale[noteInExtendedScale] and noteInExtendedScale < len(self.scale)-1:
 166                 noteInExtendedScale += 1
 167             if self.midiNoteNumbers[i]<self.scale[noteInExtendedScale]:
 168                 noteInExtendedScale -= 1
 169             self.notes.append(noteInExtendedScale)
 170
 171
 172 class Barline(object) :
 173
 174     def __init__(self, node, measureNotes) :
 175         self.node = node
 176         location = self.location = node.getAttribute('location') or 'right'
 177         try :
 178             repeatN = node.getElementsByTagName('repeat')[0]
 179             repeat = {'direction' : repeatN.getAttribute('direction'),
 180                       'times' : int(repeatN.getAttribute('times') or 1)}
 181             if location == 'left' :
 182                 repeat['note'] = measureNotes[0]
 183             elif location == 'right' :
 184                 repeat['note'] = measureNotes[-1]
 185             else :
 186                 raise ValueError(location)
 187             self.repeat = repeat
 188         except IndexError :
 189             self.repeat = None
 190
 191     def __str__(self)  :
 192         if self.repeat :
 193             if self.location == 'left' :
 194                 return '|:'
 195             elif self.location == 'right' :
 196                 return ':|'
 197         return '|'
 198
 199     __repr__ = __str__
 200
 201
 202 class Tone(object) :
 203
 204     @staticmethod
 205     def midi_to_step_alter_octave(midi):
 206         stepIndex = midi % 12
 207         step, alter = CHROM_SCALE[stepIndex]
 208         octave = midi / 12 - 1
 209         return step, alter, octave
 210
 211
 212     def __init__(self, *args) :
 213         if len(args) == 3 :
 214             self.step, self.alter, self.octave = args
 215         elif len(args) == 1 :
 216             midi = args[0]
 217             self.step, self.alter, self.octave = Tone.midi_to_step_alter_octave(midi)
 218
 219     @property
 220     def midi(self) :
 221         mid = DIATO_SCALE[self.step]
 222         mid = mid + (self.octave - OCTAVE_REF) * 12
 223         mid = mid + self.alter
 224         return mid
 225
 226
 227     @property
 228     def name(self) :
 229         name = '%s%d' % (self.step, self.octave)
 230         if self.alter < 0 :
 231             alterext = 'b'
 232         else :
 233             alterext = '#'
 234         name = '%s%s' % (name, abs(self.alter) * alterext)
 235         return name
 236
 237     @property
 238     def nom(self) :
 239         name = FR_NOTES[self.step]
 240         if self.alter < 0 :
 241             alterext = 'b'
 242         else :
 243             alterext = '#'
 244         name = '%s%s' % (name, abs(self.alter) * alterext)
 245         return name
 246
 247
 248
 249 class Note(Tone) :
 250     scale = [55, 57, 59, 60, 62, 64, 65, 67, 69, 71, 72]
 251
 252     def __init__(self, node, divisions, previous) :
 253         self.node = node
 254         self.isRest = False
 255         self.step = _getNodeValue(node, 'pitch/step', None)
 256         if self.step is not None :
 257             self.octave = int(_getNodeValue(node, 'pitch/octave'))
 258             self.alter = int(_getNodeValue(node, 'pitch/alter', 0))
 259         elif self.node.getElementsByTagName('rest') :
 260             self.isRest = True
 261         else :
 262             NotImplementedError(self.node.toxml('utf-8'))
 263
 264         self._duration = float(_getNodeValue(node, 'duration'))
 265         self.lyrics = []
 266         for ly in node.getElementsByTagName('lyric') :
 267             self.lyrics.append(Lyric(ly))
 268
 269         self.divisions = divisions
 270         self.previous = previous
 271         self.next = None
 272
 273     def __str__(self) :
 274         return (u'%5s %2s %2d %4s' % (self.nom, self.name, self.midi, round(self.duration, 2))).encode('utf-8')
 275
 276     def __repr__(self) :
 277         return self.name.encode('utf-8')
 278
 279     def addDuration(self, note) :
 280         self._duration = self.duration + note.duration
 281         self.divisions = 1
 282
 283     @property
 284     def duration(self) :
 285         return self._duration / self.divisions
 286
 287     @property
 288     def column(self):
 289         return self.scale.index(self.midi)
 290
 291
 292 class Lyric(object) :
 293
 294     _syllabicModifiers = {
 295         'single' : '%s',
 296         'begin'  : '%s -',
 297         'middle' : '- %s -',
 298         'end'    : '- %s'
 299         }
 300
 301     def __init__(self, node) :
 302         self.node = node
 303         self.syllabic = _getNodeValue(node, 'syllabic', 'single')
 304         self.text = _getNodeValue(node, 'text')
 305
 306     def syllabus(self, encoding='utf-8'):
 307         text = self._syllabicModifiers[self.syllabic] % self.text
 308         return text.encode(encoding)
 309
 310     def __str__(self) :
 311         return self.syllabus()
 312     __repr__  = __str__
 313
 314
 315
 316
 317 def _getNodeValue(node, path, default=_marker) :
 318     try :
 319         for name in path.split('/') :
 320             node = node.getElementsByTagName(name)[0]
 321         return node.firstChild.nodeValue
 322     except :
 323         if default is _marker :
 324             raise
 325         else :
 326             return default
 327
 328 def musicXml2Song(input, partIndex=0, printNotes=False) :
 329     if isinstance(input, StringTypes) :
 330         input = open(input, 'r')
 331
 332     d = parse(input)
 333     doc = d.documentElement
 334
 335     # TODO conversion préalable score-timewise -> score-partwise
 336     assert doc.nodeName == u'score-partwise'
 337
 338     parts = doc.getElementsByTagName('part')
 339     leadPart = parts[partIndex]
 340
 341     part = Part(leadPart)
 342
 343     if printNotes :
 344         part.pprint()
 345
 346     return part
 347
 348
 349
 350 def main() :
 351     usage = "%prog musicXmlFile.xml [options]"
 352     op = OptionParser(usage)
 353     op.add_option("-i", "--part-index", dest="partIndex"
 354                  , default = 0
 355                  , help = "Index de la partie qui contient le champ.")
 356     op.add_option("-p", '--print', dest='printNotes'
 357                   , action="store_true"
 358                   , default = False
 359                   , help = "Affiche les notes sur la sortie standard (debug)")
 360
 361     options, args = op.parse_args()
 362
 363     if len(args) != 1 :
 364         raise SystemExit(op.format_help())
 365
 366     musicXml2Song(args[0], partIndex=options.partIndex, printNotes=options.printNotes)
 367
 368
 369
 370 if __name__ == '__main__' :
 371     sys.exit(main())