+class Part(object) :
+
+ def __init__(self, node, autoDetectChorus=True) :
+ self.node = node
+ self.notes = []
+ self._parseMusic()
+ self.verses = [[]]
+ self.chorus = []
+ if autoDetectChorus :
+ self._findChorus()
+ self._findVersesLoops()
+
+ def _parseMusic(self) :
+ divisions = 0
+ noteIndex = 0
+ next = previous = None
+ for measureNode in self.node.getElementsByTagName('measure') :
+ # divisions de la noire
+ divisions = int(_getNodeValue(measureNode, 'attributes/divisions', divisions))
+ for noteNode in measureNode.getElementsByTagName('note') :
+ note = Note(noteNode, divisions, previous)
+ self.notes.append(note)
+ try :
+ self.notes[noteIndex-1].next = note
+ except IndexError:
+ pass
+ previous = note
+ noteIndex += 1
+
+ def _findChorus(self):
+ """ le refrain correspond aux notes pour lesquelles
+ il n'existe q'une seule syllable attachée.
+ """
+ start = stop = None
+ for i, note in enumerate(self.notes) :
+ ll = len(note.lyrics)
+ if start is None and ll == 1 :
+ start = i
+ elif start is not None and ll > 1 :
+ stop = i
+ break
+ self.chorus = self.notes[start:stop]
+
+ def _findVersesLoops(self) :
+ "recherche des couplets / boucles"
+ verse = self.verses[0]
+ for note in self.notes[:-1] :
+ verse.append(note)
+ ll = len(note.lyrics)
+ nll = len(note.next.lyrics)
+ if ll != nll :
+ verse = []
+ self.verses.append(verse)
+ verse.append(self.notes[-1])
+
+
+ def iterNotes(self) :
+ "exécution de la chanson avec l'alternance couplets / refrains"
+ for verse in self.verses :
+ repeats = len(verse[0].lyrics)
+ if repeats > 1 :
+ for i in range(repeats) :
+ # couplet
+ for note in verse :
+ yield note, i
+ # refrain
+ for note in self.chorus :
+ yield note, 0
+ else :
+ for note in verse :
+ yield note, 0
+
+ def pprint(self) :
+ for note, verseIndex in self.iterNotes() :
+ print note.name, note.midi, note.duration, note.lyrics[verseIndex]
+
+
+
+class Note(object) :
+ def __init__(self, node, divisions, previous) :
+ self.node = node
+ self.step = _getNodeValue(node, 'pitch/step')
+ self.octave = int(_getNodeValue(node, 'pitch/octave'))
+ self.alter = int(_getNodeValue(node, 'pitch/alter', 0))
+ self._duration = float(_getNodeValue(node, 'duration'))
+ self.lyrics = []
+ for ly in node.getElementsByTagName('lyric') :
+ self.lyrics.append(Lyric(ly))
+
+ self.divisions = divisions
+ self.previous = previous
+ self.next = None
+
+ @property
+ def midi(self) :
+ mid = DIATO_SCALE[self.step]
+ mid = mid + (self.octave - OCTAVE_REF) * 12
+ mid = mid + self.alter
+ return mid
+
+ @property
+ def duration(self) :
+ return self._duration / self.divisions
+
+ @property
+ def name(self) :
+ name = '%s%d' % (self.step, self.octave)
+ if self.alter < 0 :
+ alterext = 'b'
+ else :
+ alterext = '#'
+ name = '%s%s' % (name, abs(self.alter) * alterext)
+ return name
+
+
+class Lyric(object) :
+
+ _syllabicModifiers = {
+ 'single' : '%s',
+ 'begin' : '%s -',
+ 'middle' : '- %s -',
+ 'end' : '- %s'
+ }
+
+ def __init__(self, node) :
+ self.node = node
+ self.syllabic = _getNodeValue(node, 'syllabic', 'single')
+ self.text = _getNodeValue(node, 'text')
+
+ def __str__(self) :
+ text = self._syllabicModifiers[self.syllabic] % self.text
+ return text.encode('utf-8')
+ __repr__ = __str__
+
+
+
+
+def _getNodeValue(node, path, default=_marker) :
+ try :
+ for name in path.split('/') :
+ node = node.getElementsByTagName(name)[0]
+ return node.firstChild.nodeValue
+ except :
+ if default is _marker :
+ raise
+ else :
+ return default
+
+def musicXml2Song(input, output, partIndex=0, printNotes=False) :
+ if isinstance(input, StringTypes) :
+ input = open(input, 'r')
+
+ d = parse(input)
+ doc = d.documentElement
+
+ # TODO conversion préalable score-timewise -> score-partwise
+ assert doc.nodeName == u'score-partwise'
+
+ parts = doc.getElementsByTagName('part')
+ leadPart = parts[partIndex]
+
+ part = Part(leadPart)
+
+ if printNotes :
+ part.pprint()
+
+ # divisions de la noire
+# divisions = 0
+# midiNotes, durations, lyrics = [], [], []
+#
+# for measureNode in leadPart.getElementsByTagName('measure') :
+# divisions = int(_getNodeValue(measureNode, 'attributes/divisions', divisions))
+# for noteNode in measureNode.getElementsByTagName('note') :
+# note = Note(noteNode, divisions)
+# if printNotes :
+# print note.name, note.midi, note.duration, note.lyric
+# midiNotes.append(note.midi)
+# durations.append(note.duration)
+# lyrics.append(note.lyric)
+#
+# song = Song(None,
+# midiNoteNumbers = midiNotes,
+# noteLengths = durations,
+# lyrics = lyrics,
+# notesInExtendedScale=None)
+# song.save(output)
+
+
projects / minwii.git / blobdiff