system-midi-a-fixed / backend /midi_utils.py
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import mido
from io import BytesIO
def process_midi(midi_bytes: bytes) -> BytesIO:
"""处理MIDI文件:将所有音符提高一个半音"""
# 创建内存中的MIDI文件
with BytesIO(midi_bytes) as input_buffer:
mid = mido.MidiFile(file=input_buffer)
# 处理所有轨道
for track in mid.tracks:
for msg in track:
if msg.type in ['note_on', 'note_off']:
msg.note += 1 # 升一个半音
# 将处理后的MIDI保存到输出缓冲区
output_buffer = BytesIO()
mid.save(file=output_buffer)
output_buffer.seek(0)
return output_buffer