[英]How to find the tempo of a .wav with aubio?
我想在 python 3.6 中檢測音頻文件的速度,但我不太了解關於 aubio 的文檔。 有人可以指出如何使用aubio或其他圖書館提取節奏嗎?
更新
此命令將為您提供整個文件的速度估計(在0.4.5
可用):
aubio tempo foo.wav
aubio的python/demos
有一個簡單的python/demos
: demo_bpm_extract.py 。
最重要的部分是以下兩行,它們計算每個連續節拍之間的周期 ( np.diff
),將這些周期轉換為 bpm ( 60./
),並將中位數 ( np.median
) 作為最可能的bpm 候選對於這一系列的節拍:
#!/usr/bin/env python
import numpy as np
bpms = 60./np.diff(beats)
median_bpm = np.median(bpms)
請注意這里的中位數如何比均值更合適,因為它始終會給出原始總體bpms
存在的估計值。
我發現 Paul Brossier 的這段代碼可以幫助你,這里是:
#! /usr/bin/env python
from aubio import source, tempo
from numpy import median, diff
def get_file_bpm(path, params = None):
""" Calculate the beats per minute (bpm) of a given file.
path: path to the file
param: dictionary of parameters
"""
if params is None:
params = {}
try:
win_s = params['win_s']
samplerate = params['samplerate']
hop_s = params['hop_s']
except KeyError:
"""
# super fast
samplerate, win_s, hop_s = 4000, 128, 64
# fast
samplerate, win_s, hop_s = 8000, 512, 128
"""
# default:
samplerate, win_s, hop_s = 44100, 1024, 512
s = source(path, samplerate, hop_s)
samplerate = s.samplerate
o = tempo("specdiff", win_s, hop_s, samplerate)
# List of beats, in samples
beats = []
# Total number of frames read
total_frames = 0
while True:
samples, read = s()
is_beat = o(samples)
if is_beat:
this_beat = o.get_last_s()
beats.append(this_beat)
#if o.get_confidence() > .2 and len(beats) > 2.:
# break
total_frames += read
if read < hop_s:
break
# Convert to periods and to bpm
if len(beats) > 1:
if len(beats) < 4:
print("few beats found in {:s}".format(path))
bpms = 60./diff(beats)
b = median(bpms)
else:
b = 0
print("not enough beats found in {:s}".format(path))
return b
if __name__ == '__main__':
import sys
for f in sys.argv[1:]:
bpm = get_file_bpm(f)
print("{:6s} {:s}".format("{:2f}".format(bpm), f))
這是關鍵部分:
bpms = 60./np.diff(beats)
median_bpm = np.median(bpms)
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.