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
  26 class Note(object) :
  27     def __init__(self, node, divisions) :
  28         self.step = _getNodeValue(node, 'pitch/step')
  29         self.octave = int(_getNodeValue(node, 'pitch/octave'))
  30         self.alter = int(_getNodeValue(node, 'pitch/alter', 0))
  31         self._duration = float(_getNodeValue(node, 'duration'))
  32         self.lyric = _getNodeValue(node, 'lyric/text')
  33
  34         self.divisions = divisions
  35
  36     @property
  37     def midi(self) :
  38         mid = DIATO_SCALE[self.step]
  39         mid = mid + (self.octave - OCTAVE_REF) * 12
  40         mid = mid + self.alter
  41         return mid
  42
  43     @property
  44     def duration(self) :
  45         return self._duration / self.divisions
  46
  47     @property
  48     def name(self) :
  49         name = '%s%d' % (self.step, self.octave)
  50         if self.alter < 0 :
  51             alterext = 'b'
  52         else :
  53             alterext = '#'
  54         name = '%s%s' % (name, abs(self.alter) * alterext)
  55         return name
  56
  57
  58
  59
  60 def _getNodeValue(node, path, default=_marker) :
  61     try :
  62         for name in path.split('/') :
  63             node = node.getElementsByTagName(name)[0]
  64         return node.firstChild.nodeValue
  65     except :
  66         if default is _marker :
  67             raise
  68         else :
  69             return default
  70
  71 def musicXml2Song(input, output, partIndex=0, printNotes=False) :
  72     if isinstance(input, StringTypes) :
  73         input = open(input, 'r')
  74
  75     d = parse(input)
  76     doc = d.documentElement
  77
  78     # TODO conversion préalable score-timewise -> score-partwise
  79     assert doc.nodeName == u'score-partwise'
  80
  81     parts = doc.getElementsByTagName('part')
  82     leadPart = parts[partIndex]
  83
  84     # divisions de la noire
  85     divisions = 0
  86     midiNotes, durations, lyrics = [], [], []
  87
  88     for measureNode in leadPart.getElementsByTagName('measure') :
  89         divisions = int(_getNodeValue(measureNode, 'attributes/divisions', divisions))
  90         for noteNode in measureNode.getElementsByTagName('note') :
  91             note = Note(noteNode, divisions)
  92             if printNotes :
  93                 print note.name, note.midi, note.duration, note.lyric
  94             midiNotes.append(note.midi)
  95             durations.append(note.duration)
  96             lyrics.append(note.lyric)
  97
  98     song = Song(None,
  99                 midiNoteNumbers = midiNotes,
 100                 noteLengths = durations,
 101                 lyrics = lyrics,
 102                 notesInExtendedScale=None)
 103     song.save(output)
 104
 105
 106 def main() :
 107     usage = "%prog musicXmlFile.xml outputSongFile.smwi [options]"
 108     op = OptionParser(usage)
 109     op.add_option("-i", "--part-index", dest="partIndex"
 110                  , default = 0
 111                  , help = "Index de la partie qui contient le champ.")
 112     op.add_option("-p", '--print', dest='printNotes'
 113                   , action="store_true"
 114                   , default = False
 115                   , help = "Affiche les notes sur la sortie standard (debug)")
 116
 117     options, args = op.parse_args()
 118
 119     if len(args) != 2 :
 120         raise SystemExit(op.format_help())
 121
 122     musicXml2Song(args[0], args[1], partIndex=options.partIndex, printNotes=options.printNotes)
 123
 124
 125
 126 if __name__ == '__main__' :
 127     sys.exit(main())