ref: 9cf6462eb4ac7a99f8f7f8b6215bfa90061eafec
dir: /python/demos/demo_tempo.py/
#! /usr/bin/env python
import sys
from aubio import tempo, source
win_s = 512 # fft size
hop_s = win_s // 2 # hop size
if len(sys.argv) < 2:
print("Usage: %s <filename> [samplerate]" % sys.argv[0])
sys.exit(1)
filename = sys.argv[1]
samplerate = 0
if len( sys.argv ) > 2: samplerate = int(sys.argv[2])
s = source(filename, samplerate, hop_s)
samplerate = s.samplerate
o = tempo("default", win_s, hop_s, samplerate)
# tempo detection delay, in samples
# default to 4 blocks delay to catch up with
delay = 4. * hop_s
# 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 = int(total_frames - delay + is_beat[0] * hop_s)
print("%f" % (this_beat / float(samplerate)))
beats.append(this_beat)
total_frames += read
if read < hop_s: break
#print len(beats)