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     requiresExtendedScale = False
  52     scale = [55, 57, 59, 60, 62, 64, 65, 67, 69, 71, 72]
  53     quarterNoteLength = 400
  54
  55     def __init__(self, node, autoDetectChorus=True) :
  56         self.node = node
  57         self.notes = []
  58         self.repeats = []
  59         self._parseMusic()
  60         self.verses = [[]]
  61         self.chorus = []
  62         if autoDetectChorus :
  63             self._findChorus()
  64         self._findVersesLoops()
  65
  66     def _parseMusic(self) :
  67         divisions = 0
  68         previous = None
  69
  70         for measureNode in self.node.getElementsByTagName('measure') :
  71             measureNotes = []
  72
  73             # iteration sur les notes
  74             # divisions de la noire
  75             divisions = int(_getNodeValue(measureNode, 'attributes/divisions', divisions))
  76             for noteNode in measureNode.getElementsByTagName('note') :
  77                 note = Note(noteNode, divisions, previous)
  78                 if not note.isRest :
  79                     measureNotes.append(note)
  80                     if previous :
  81                         previous.next = note
  82                 else :
  83                     previous.addDuration(note)
  84                     continue
  85                 previous = note
  86             self.notes.extend(measureNotes)
  87
  88             # barres de reprises
  89             try :
  90                 barlineNode = measureNode.getElementsByTagName('barline')[0]
  91             except IndexError :
  92                 continue
  93
  94             barline = Barline(barlineNode, measureNotes)
  95             if barline.repeat :
  96                 self.repeats.append(barline)
  97
  98     def _findChorus(self):
  99         """ le refrain correspond aux notes pour lesquelles
 100             il n'existe q'une seule syllable attachée.
 101         """
 102         start = stop = None
 103         for i, note in enumerate(self.notes) :
 104             ll = len(note.lyrics)
 105             if start is None and ll == 1 :
 106                 start = i
 107             elif start is not None and ll > 1 :
 108                 stop = i
 109                 break
 110         self.chorus = self.notes[start:stop]
 111
 112     def _findVersesLoops(self) :
 113         "recherche des couplets / boucles"
 114         verse = self.verses[0]
 115         for note in self.notes[:-1] :
 116             verse.append(note)
 117             ll = len(note.lyrics)
 118             nll = len(note.next.lyrics)
 119             if ll != nll :
 120                 verse = []
 121                 self.verses.append(verse)
 122         verse.append(self.notes[-1])
 123
 124
 125     def iterNotes(self, indefinitely=True) :
 126         "exécution de la chanson avec l'alternance couplets / refrains"
 127         print 'indefinitely', indefinitely
 128         if indefinitely == False :
 129             iterable = self.verses
 130         else :
 131             iterable = cycle(self.verses)
 132         for verse in iterable :
 133             print "---partie---"
 134             repeats = len(verse[0].lyrics)
 135             if repeats > 1 :
 136                 for i in range(repeats) :
 137                     # couplet
 138                     print "---couplet%d---" % i
 139                     for note in verse :
 140                         yield note, i
 141                     # refrain
 142                     print "---refrain---"
 143                     for note in self.chorus :
 144                         yield note, 0
 145             else :
 146                 for note in verse :
 147                     yield note, 0
 148
 149     def pprint(self) :
 150         for note, verseIndex in self.iterNotes(indefinitely=False) :
 151             print note, note.lyrics[verseIndex]
 152
 153
 154     def assignNotesFromMidiNoteNumbers(self):
 155         # TODO faire le mapping bande hauteur midi
 156         for i in range(len(self.midiNoteNumbers)):
 157             noteInExtendedScale = 0
 158             while self.midiNoteNumbers[i] > self.scale[noteInExtendedScale] and noteInExtendedScale < len(self.scale)-1:
 159                 noteInExtendedScale += 1
 160             if self.midiNoteNumbers[i]<self.scale[noteInExtendedScale]:
 161                 noteInExtendedScale -= 1
 162             self.notes.append(noteInExtendedScale)
 163
 164
 165 class Barline(object) :
 166
 167     def __init__(self, node, measureNotes) :
 168         self.node = node
 169         location = self.location = node.getAttribute('location') or 'right'
 170         try :
 171             repeatN = node.getElementsByTagName('repeat')[0]
 172             repeat = {'direction' : repeatN.getAttribute('direction'),
 173                       'times' : int(repeatN.getAttribute('times') or 1)}
 174             if location == 'left' :
 175                 repeat['note'] = measureNotes[0]
 176             elif location == 'right' :
 177                 repeat['note'] = measureNotes[-1]
 178             else :
 179                 raise ValueError(location)
 180             self.repeat = repeat
 181         except IndexError :
 182             self.repeat = None
 183
 184     def __str__(self)  :
 185         if self.repeat :
 186             if self.location == 'left' :
 187                 return '|:'
 188             elif self.location == 'right' :
 189                 return ':|'
 190         return '|'
 191
 192     __repr__ = __str__
 193
 194
 195 class Tone(object) :
 196
 197     @staticmethod
 198     def midi_to_step_alter_octave(midi):
 199         stepIndex = midi % 12
 200         step, alter = CHROM_SCALE[stepIndex]
 201         octave = midi / 12 - 1
 202         return step, alter, octave
 203
 204
 205     def __init__(self, *args) :
 206         if len(args) == 3 :
 207             self.step, self.alter, self.octave = args
 208         elif len(args) == 1 :
 209             midi = args[0]
 210             self.step, self.alter, self.octave = Tone.midi_to_step_alter_octave(midi)
 211
 212     @property
 213     def midi(self) :
 214         mid = DIATO_SCALE[self.step]
 215         mid = mid + (self.octave - OCTAVE_REF) * 12
 216         mid = mid + self.alter
 217         return mid
 218
 219
 220     @property
 221     def name(self) :
 222         name = '%s%d' % (self.step, self.octave)
 223         if self.alter < 0 :
 224             alterext = 'b'
 225         else :
 226             alterext = '#'
 227         name = '%s%s' % (name, abs(self.alter) * alterext)
 228         return name
 229
 230     @property
 231     def nom(self) :
 232         name = FR_NOTES[self.step]
 233         if self.alter < 0 :
 234             alterext = 'b'
 235         else :
 236             alterext = '#'
 237         name = '%s%s' % (name, abs(self.alter) * alterext)
 238         return name
 239
 240
 241
 242 class Note(Tone) :
 243     scale = [55, 57, 59, 60, 62, 64, 65, 67, 69, 71, 72]
 244
 245     def __init__(self, node, divisions, previous) :
 246         self.node = node
 247         self.isRest = False
 248         self.step = _getNodeValue(node, 'pitch/step', None)
 249         if self.step is not None :
 250             self.octave = int(_getNodeValue(node, 'pitch/octave'))
 251             self.alter = int(_getNodeValue(node, 'pitch/alter', 0))
 252         elif self.node.getElementsByTagName('rest') :
 253             self.isRest = True
 254         else :
 255             NotImplementedError(self.node.toxml('utf-8'))
 256
 257         self._duration = float(_getNodeValue(node, 'duration'))
 258         self.lyrics = []
 259         for ly in node.getElementsByTagName('lyric') :
 260             self.lyrics.append(Lyric(ly))
 261
 262         self.divisions = divisions
 263         self.previous = previous
 264         self.next = None
 265
 266     def __str__(self) :
 267         return (u'%5s %2s %2d %4s' % (self.nom, self.name, self.midi, round(self.duration, 2))).encode('utf-8')
 268
 269     def __repr__(self) :
 270         return self.name.encode('utf-8')
 271
 272     def addDuration(self, note) :
 273         self._duration = self.duration + note.duration
 274         self.divisions = 1
 275
 276 #    @property
 277 #    def midi(self) :
 278 #        mid = DIATO_SCALE[self.step]
 279 #        mid = mid + (self.octave - OCTAVE_REF) * 12
 280 #        mid = mid + self.alter
 281 #        return mid
 282
 283     @property
 284     def duration(self) :
 285         return self._duration / self.divisions
 286
 287 #    @property
 288 #    def name(self) :
 289 #        name = '%s%d' % (self.step, self.octave)
 290 #        if self.alter < 0 :
 291 #            alterext = 'b'
 292 #        else :
 293 #            alterext = '#'
 294 #        name = '%s%s' % (name, abs(self.alter) * alterext)
 295 #        return name
 296 #
 297 #    @property
 298 #    def nom(self) :
 299 #        name = FR_NOTES[self.step]
 300 #        if self.alter < 0 :
 301 #            alterext = 'b'
 302 #        else :
 303 #            alterext = '#'
 304 #        name = '%s%s' % (name, abs(self.alter) * alterext)
 305 #        return name
 306
 307     @property
 308     def column(self):
 309         return self.scale.index(self.midi)
 310
 311
 312 class Lyric(object) :
 313
 314     _syllabicModifiers = {
 315         'single' : '%s',
 316         'begin'  : '%s -',
 317         'middle' : '- %s -',
 318         'end'    : '- %s'
 319         }
 320
 321     def __init__(self, node) :
 322         self.node = node
 323         self.syllabic = _getNodeValue(node, 'syllabic', 'single')
 324         self.text = _getNodeValue(node, 'text')
 325
 326     def syllabus(self, encoding='utf-8'):
 327         text = self._syllabicModifiers[self.syllabic] % self.text
 328         return text.encode(encoding)
 329
 330     def __str__(self) :
 331         return self.syllabus()
 332     __repr__  = __str__
 333
 334
 335
 336
 337 def _getNodeValue(node, path, default=_marker) :
 338     try :
 339         for name in path.split('/') :
 340             node = node.getElementsByTagName(name)[0]
 341         return node.firstChild.nodeValue
 342     except :
 343         if default is _marker :
 344             raise
 345         else :
 346             return default
 347
 348 def musicXml2Song(input, partIndex=0, printNotes=False) :
 349     if isinstance(input, StringTypes) :
 350         input = open(input, 'r')
 351
 352     d = parse(input)
 353     doc = d.documentElement
 354
 355     # TODO conversion préalable score-timewise -> score-partwise
 356     assert doc.nodeName == u'score-partwise'
 357
 358     parts = doc.getElementsByTagName('part')
 359     leadPart = parts[partIndex]
 360
 361     part = Part(leadPart)
 362
 363     if printNotes :
 364         part.pprint()
 365
 366     return part
 367
 368
 369
 370 def main() :
 371     usage = "%prog musicXmlFile.xml [options]"
 372     op = OptionParser(usage)
 373     op.add_option("-i", "--part-index", dest="partIndex"
 374                  , default = 0
 375                  , help = "Index de la partie qui contient le champ.")
 376     op.add_option("-p", '--print', dest='printNotes'
 377                   , action="store_true"
 378                   , default = False
 379                   , help = "Affiche les notes sur la sortie standard (debug)")
 380
 381     options, args = op.parse_args()
 382
 383     if len(args) != 1 :
 384         raise SystemExit(op.format_help())
 385
 386     musicXml2Song(args[0], partIndex=options.partIndex, printNotes=options.printNotes)
 387
 388
 389
 390 if __name__ == '__main__' :
 391     sys.exit(main())