Hacktoberfest 2026：メンテナが10月に向けて印を付けた、オープンで初心者向けの issue。 Hacktoberfest の issue を見る

MusicXML import ignores jumps written as `<sound>` attributes

オープン
  • 何か問題がありますか？
#2,079 コメント 0 件 リアクション 0 件 担当者 0 名 GitHub で見る

メンテナーはふだん 1 日以内に返信

まだ誰も着手していません。

評価

難易度
4/5
見積もり時間
3〜5日
初心者へのやさしさ
28/100
issue の種類
バグ
明瞭さ
おおむね明確
活発さ
活発
技術スタック
python
領域
data

調査の方向性

Start with SoundTagMixin.setSound in musicxml/xmlSoundParser.py, which handles only tempo and has TODOs for dacapo, dalsegno, tocoda, fine, segno and coda, then check how the <words> repeat expressions are created in the MusicXML importer. Run the reproduction script in the issue and confirm the expanded note list includes the second D E pass. Done means a <sound dalsegno> jump is honoured without matching text, and the design question of how multiple <sound> tags map to one jump expression is settled first.

索引モデルが issue の本文から書いたものです。

説明

music21 version

10.5.0

Problem summary

The MusicXML importer only creates repeat expressions (Segno, Coda, DalSegnoAlCoda, ...) from the text of <words> directions. It ignores the dacapo, dalsegno, tocoda, fine, segno and coda attributes of <sound>, which are how MusicXML encodes jumps for playback. So when the <words> text isn't one of the recognized phrases, or there's no text, expandRepeats() skips the jump even though the <sound> says exactly what it is.

Steps to reproduce

from music21 import converter

def measure(number, step, before="", after=""):
    return (f'<measure number="{number}">{before}<note><pitch><step>{step}</step>'
            f'<octave>4</octave></pitch><duration>4</duration><type>whole</type></note>{after}</measure>')

xml = f'''<score-partwise version="4.0">
  <part-list><score-part id="P1"><part-name>Music</part-name></score-part></part-list>
  <part id="P1">
    {measure(1, "C", "<attributes><divisions>1</divisions></attributes>")}
    {measure(2, "D", '<direction><direction-type><segno/></direction-type><sound segno="segno"/></direction>')}
    {measure(3, "E", after='<direction><direction-type><words>To Coda</words></direction-type><sound tocoda="coda"/></direction>')}
    {measure(4, "F", after='<direction><direction-type><words>Repeat from sign, then go to the coda</words></direction-type><sound dalsegno="segno"/></direction>')}
    {measure(5, "G", '<direction><direction-type><coda/></direction-type><sound coda="coda"/></direction>')}
  </part>
</score-partwise>'''

expanded = converter.parse(xml, format='musicxml').expandRepeats()
print([n.name for n in expanded.flatten().notes])

Expected vs. actual behavior

Expected ['C', 'D', 'E', 'F', 'D', 'E', 'G'], from the dalsegno attribute. Actual:

['C', 'D', 'E', 'F', 'G']

With <words>D.S. al Coda</words> the jump is taken, so this only affects jumps whose text isn't a recognized phrase.

More information

SoundTagMixin.setSound in musicxml/xmlSoundParser.py only handles tempo, and has TODOs for coda, dacapo, dalsegno, fine, segno and tocoda.

A suggestion for how the two sources could combine: if only one of <words> and <sound> gives a jump, use it; if both do and they disagree, prefer <sound>, since it's the playback encoding, and maybe warn.

One complication: music21 represents a jump as a single expression, like DalSegnoAlCoda, but MusicXML spreads it over several <sound>s: dalsegno at the jump, tocoda at the "To Coda", and fine at the Fine. So a <sound dalsegno> on its own only says "D.S.", and telling whether it's "al Coda" or "al Fine" means looking for tocoda or fine elsewhere in the part. For the same reason, <words>D.S. al Coda</words> with <sound dalsegno="segno"/> isn't a disagreement, just a more specific description.

主要言語
Python
スター
2.6k
フォーク
459
平均マージ
1日 9時間
マージ済み PR（30日）
38

環境構築

Codespaces で開く

このプロジェクトの開発コンテナを、あなたの GitHub アカウントでブラウザ上に起動します。

はじめの一歩

  1. issue を最後まで読み、次にプロジェクトのコントリビューションガイドを読みます。
  2. 着手することを issue にコメントします — 二人が同じ作業をするのを防げます。
  3. リポジトリをフォークし、ブランチを切って変更します。
  4. issue 番号を参照したプルリクエストを送ります。

cuthbertLab/music21 のほかの issue

cuthbertLab/music21 の issue をすべて見る

似ている issue

Python の issue をもっと見る

新しい issue をメールで受け取る

初心者向けの GitHub issue を短くまとめたダイジェスト。