source: python/demos/demo_tempo.py @ 459e46f

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 459e46f was 459e46f, checked in by Paul Brossier <piem@piem.org>, 6 years ago

python/demos/: update and add some demos

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File size: 941 bytes
Line 
1#! /usr/bin/env python
2
3import sys
4from aubio import tempo, source
5
6win_s = 512                 # fft size
7hop_s = win_s / 2           # hop size
8
9if len(sys.argv) < 2:
10    print "Usage: %s <filename> [samplerate]" % sys.argv[0]
11    sys.exit(1)
12
13filename = sys.argv[1]
14
15samplerate = 0
16if len( sys.argv ) > 2: samplerate = int(sys.argv[2])
17
18s = source(filename, samplerate, hop_s)
19samplerate = s.samplerate
20o = tempo("default", win_s, hop_s, samplerate)
21
22# tempo detection delay, in samples
23# default to 4 blocks delay to catch up with
24delay = 4. * hop_s
25
26# list of beats, in samples
27beats = []
28
29# total number of frames read
30total_frames = 0
31while True:
32    samples, read = s()
33    is_beat = o(samples)
34    if is_beat:
35        this_beat = int(total_frames - delay + is_beat[0] * hop_s)
36        print "%f" % (this_beat / float(samplerate))
37        beats.append(this_beat)
38    total_frames += read
39    if read < hop_s: break
40#print len(beats)
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