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