mirror of
https://github.com/TriM-Organization/Musicreater.git
synced 2024-11-11 01:27:35 +08:00
68 lines
1.7 KiB
Python
68 lines
1.7 KiB
Python
import mido
|
|
import numpy
|
|
|
|
'''
|
|
bpm
|
|
bites per minutes
|
|
每分钟的拍数
|
|
'''
|
|
|
|
def mt2gt(mt, tpb_a, bpm_a):
|
|
return round(mt / tpb_a / bpm_a * 60)
|
|
|
|
|
|
def get(mid:mido.MidiFile) -> int:
|
|
'''传入一个 MidiFile, 返回其音乐的bpm
|
|
:param mid : mido.MidFile
|
|
mido库识别的midi文件数据
|
|
:return bpm : int
|
|
'''
|
|
# mid = mido.MidiFile(mf)
|
|
long = mid.length
|
|
tpb = mid.ticks_per_beat
|
|
bpm = 20
|
|
gotV = 0
|
|
|
|
for track in mid.tracks:
|
|
global_time = 0
|
|
for msg in track:
|
|
global_time += msg.time
|
|
if msg.type == "note_on" and msg.velocity > 0:
|
|
gotV = mt2gt(global_time, tpb, bpm)
|
|
errorV = numpy.fabs(gotV - long)
|
|
last_dic = {bpm: errorV}
|
|
if last_dic.get(bpm) > errorV:
|
|
last_dic = {bpm: errorV}
|
|
bpm += 2
|
|
|
|
while True:
|
|
for track in mid.tracks:
|
|
global_time = 0
|
|
for msg in track:
|
|
global_time += msg.time
|
|
if msg.type == "note_on" and msg.velocity > 0:
|
|
gotV = mt2gt(global_time, tpb, bpm)
|
|
errorV = numpy.fabs(gotV - long)
|
|
try:
|
|
if last_dic.get(bpm - 2) > errorV:
|
|
last_dic = {bpm: errorV}
|
|
except TypeError:
|
|
pass
|
|
bpm += 2
|
|
if bpm >= 252:
|
|
break
|
|
print(list(last_dic.keys())[0])
|
|
return list(last_dic.keys())[0]
|
|
|
|
|
|
def compute(mid:mido.MidiFile):
|
|
answer = 60000000/mid.ticks_per_beat
|
|
print(answer)
|
|
return answer
|
|
|
|
|
|
if __name__ == '__main__':
|
|
mid = mido.MidiFile(r"C:\Users\lc\Documents\MuseScore3\乐谱\乐谱\Bad style - Time back.mid")
|
|
get(mid)
|
|
compute(mid)
|