src/songs/musicxmltosong.py

   1 # -*- coding: utf-8 -*-
   2 """
   3 converstion 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 Song import Song
  13
  14 # Do4 <=> midi 60
  15 OCTAVE_REF = 4
  16 DIATO_SCALE = {'C' : 60,
  17                'D' : 62,
  18                'E' : 64,
  19                'F' : 65,
  20                'G' : 67,
  21                'A' : 69,
  22                'B' : 71}
  23 _marker = []
  24
  25 class Part(object) :
  26
  27     def __init__(self, node, autoDetectChorus=True) :
  28         self.node = node
  29         self.notes = []
  30         self._parseMusic()
  31         self.verses = [[]]
  32         self.chorus = []
  33         if autoDetectChorus :
  34             self._findChorus()
  35         self._findVersesLoops()
  36
  37     def _parseMusic(self) :
  38         divisions = 0
  39         noteIndex = 0
  40         next = previous = None
  41         for measureNode in self.node.getElementsByTagName('measure') :
  42             # divisions de la noire
  43             divisions = int(_getNodeValue(measureNode, 'attributes/divisions', divisions))
  44             for noteNode in measureNode.getElementsByTagName('note') :
  45                 note = Note(noteNode, divisions, previous)
  46                 self.notes.append(note)
  47                 try :
  48                     self.notes[noteIndex-1].next = note
  49                 except IndexError:
  50                     pass
  51                 previous = note
  52                 noteIndex += 1
  53
  54     def _findChorus(self):
  55         """ le refrain correspond aux notes pour lesquelles
  56             il n'existe q'une seule syllable attachée.
  57         """
  58         start = stop = None
  59         for i, note in enumerate(self.notes) :
  60             ll = len(note.lyrics)
  61             if start is None and ll == 1 :
  62                 start = i
  63             elif start is not None and ll > 1 :
  64                 stop = i
  65                 break
  66         self.chorus = self.notes[start:stop]
  67
  68     def _findVersesLoops(self) :
  69         "recherche des couplets / boucles"
  70         verse = self.verses[0]
  71         for note in self.notes[:-1] :
  72             verse.append(note)
  73             ll = len(note.lyrics)
  74             nll = len(note.next.lyrics)
  75             if ll != nll :
  76                 verse = []
  77                 self.verses.append(verse)
  78         verse.append(self.notes[-1])
  79
  80
  81     def iterNotes(self) :
  82         "exécution de la chanson avec l'alternance couplets / refrains"
  83         for verse in self.verses :
  84             repeats = len(verse[0].lyrics)
  85             if repeats > 1 :
  86                 for i in range(repeats) :
  87                     # couplet
  88                     for note in verse :
  89                         yield note, i
  90                     # refrain
  91                     for note in self.chorus :
  92                         yield note, 0
  93             else :
  94                 for note in verse :
  95                     yield note, 0
  96
  97     def pprint(self) :
  98         for note, verseIndex in self.iterNotes() :
  99             print note.name, note.midi, note.duration, note.lyrics[verseIndex]
 100
 101
 102
 103 class Note(object) :
 104     def __init__(self, node, divisions, previous) :
 105         self.node = node
 106         self.step = _getNodeValue(node, 'pitch/step')
 107         self.octave = int(_getNodeValue(node, 'pitch/octave'))
 108         self.alter = int(_getNodeValue(node, 'pitch/alter', 0))
 109         self._duration = float(_getNodeValue(node, 'duration'))
 110         self.lyrics = []
 111         for ly in node.getElementsByTagName('lyric') :
 112             self.lyrics.append(Lyric(ly))
 113
 114         self.divisions = divisions
 115         self.previous = previous
 116         self.next = None
 117
 118     @property
 119     def midi(self) :
 120         mid = DIATO_SCALE[self.step]
 121         mid = mid + (self.octave - OCTAVE_REF) * 12
 122         mid = mid + self.alter
 123         return mid
 124
 125     @property
 126     def duration(self) :
 127         return self._duration / self.divisions
 128
 129     @property
 130     def name(self) :
 131         name = '%s%d' % (self.step, self.octave)
 132         if self.alter < 0 :
 133             alterext = 'b'
 134         else :
 135             alterext = '#'
 136         name = '%s%s' % (name, abs(self.alter) * alterext)
 137         return name
 138
 139
 140 class Lyric(object) :
 141     def __init__(self, node) :
 142         self.node = node
 143         self.syllabic = _getNodeValue(node, 'syllabic', 'single')
 144         self.text = _getNodeValue(node, 'text')
 145
 146     def __str__(self) :
 147         return self.text.encode('utf-8')
 148     __repr__  = __str__
 149
 150
 151
 152
 153 def _getNodeValue(node, path, default=_marker) :
 154     try :
 155         for name in path.split('/') :
 156             node = node.getElementsByTagName(name)[0]
 157         return node.firstChild.nodeValue
 158     except :
 159         if default is _marker :
 160             raise
 161         else :
 162             return default
 163
 164 def musicXml2Song(input, output, partIndex=0, printNotes=False) :
 165     if isinstance(input, StringTypes) :
 166         input = open(input, 'r')
 167
 168     d = parse(input)
 169     doc = d.documentElement
 170
 171     # TODO conversion préalable score-timewise -> score-partwise
 172     assert doc.nodeName == u'score-partwise'
 173
 174     parts = doc.getElementsByTagName('part')
 175     leadPart = parts[partIndex]
 176
 177     part = Part(leadPart)
 178
 179     if printNotes :
 180         part.pprint()
 181
 182     # divisions de la noire
 183 #    divisions = 0
 184 #    midiNotes, durations, lyrics = [], [], []
 185 #
 186 #    for measureNode in leadPart.getElementsByTagName('measure') :
 187 #        divisions = int(_getNodeValue(measureNode, 'attributes/divisions', divisions))
 188 #        for noteNode in measureNode.getElementsByTagName('note') :
 189 #            note = Note(noteNode, divisions)
 190 #            if printNotes :
 191 #                print note.name, note.midi, note.duration, note.lyric
 192 #            midiNotes.append(note.midi)
 193 #            durations.append(note.duration)
 194 #            lyrics.append(note.lyric)
 195 #
 196 #    song = Song(None,
 197 #                midiNoteNumbers = midiNotes,
 198 #                noteLengths = durations,
 199 #                lyrics = lyrics,
 200 #                notesInExtendedScale=None)
 201 #    song.save(output)
 202
 203
 204 def main() :
 205     usage = "%prog musicXmlFile.xml outputSongFile.smwi [options]"
 206     op = OptionParser(usage)
 207     op.add_option("-i", "--part-index", dest="partIndex"
 208                  , default = 0
 209                  , help = "Index de la partie qui contient le champ.")
 210     op.add_option("-p", '--print', dest='printNotes'
 211                   , action="store_true"
 212                   , default = False
 213                   , help = "Affiche les notes sur la sortie standard (debug)")
 214
 215     options, args = op.parse_args()
 216
 217     if len(args) != 2 :
 218         raise SystemExit(op.format_help())
 219
 220     musicXml2Song(args[0], args[1], partIndex=options.partIndex, printNotes=options.printNotes)
 221
 222
 223
 224 if __name__ == '__main__' :
 225     sys.exit(main())