ref: b1306004ba4b7e796472958f2b83f2cdf7cee2a4
dir: /python/demos/demo_onset.py/
#! /usr/bin/env python
import sys
from aubio import source, onset
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 = onset("default", win_s, hop_s, samplerate)
# onset detection delay, in samples
# default to 4 blocks delay to catch up with
delay = 4. * hop_s
# list of onsets, in samples
onsets = []
# total number of frames read
total_frames = 0
while True:
samples, read = s()
is_onset = o(samples)
if is_onset:
this_onset = int(total_frames - delay + is_onset[0] * hop_s)
print "%f" % (this_onset / float(samplerate))
onsets.append(this_onset)
total_frames += read
if read < hop_s: break
#print len(onsets)