ref: 84838c3a967bbda30f250b4292af3c4c986a60e1
dir: /python/demos/demo_bpm_extract.py/
#! /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 == 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
bpms = 60./diff(beats)
b = median(bpms)
return b
if __name__ == '__main__':
import sys
for f in sys.argv[1:]:
bpm = get_file_bpm(f)
print "%6s" % ("%.2f" % bpm), f