如何读取Midi文件，更改其乐器并写回? [英] How do I read a midi file, change its instrument, and write it back?

问题描述

我想解析一个已经存在的.mid文件，将其乐器从原声三角钢琴"更改为小提琴"，然后将其保存回来或另存为另一个.mid文件.

I want to parse an already existing .mid file, change its instrument, from 'acoustic grand piano' to 'violin' for example, and save it back or as another .mid file.

根据我在文档中看到的内容，使用program_change或patch_change指令对乐器进行了更改，但是在已经存在的MIDI文件中找不到可以执行此操作的任何库.他们似乎都只支持从头开始创建的MIDI文件.

From what I saw in the documentation, the instrument gets altered with a program_change or patch_change directive but I cannot find any library that does this in MIDI files that exist already. They all seem to support it only MIDI files created from scratch.

推荐答案

使用 music21库 (插入我自己的系统，希望可以).如果零件中定义了补丁，请执行以下操作:

Use the music21 library (plugging my own system, hope that's okay). If there are patches defined in the parts, do:

from music21 import converter,instrument # or import *
s = converter.parse('/Users/cuthbert/Desktop/oldfilename.mid')

for el in s.recurse():
    if 'Instrument' in el.classes: # or 'Piano'
        el.activeSite.replace(el, instrument.Violin())

s.write('midi', '/Users/cuthbert/Desktop/newfilename.mid')

或当前未定义补丁更改:

or if there are no patch changes currently defined:

from music21 import converter,instrument # or import *
s = converter.parse('/Users/cuthbert/Desktop/oldfilename.mid')

for p in s.parts:
    p.insert(0, instrument.Violin())

s.write('midi', '/Users/cuthbert/Desktop/newfilename.mid')

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