source: python/demos/demo_onset_plot.py @ 8b884ef

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 8b884ef was 8b884ef, checked in by Paul Brossier <piem@piem.org>, 6 years ago

src/onset/: rename get_last_onset to get_last

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1#! /usr/bin/env python
2
3import sys
4from aubio import onset, source
5from numpy import array, hstack, zeros
6
7win_s = 512                 # fft size
8hop_s = win_s / 2           # hop size
9
10if len(sys.argv) < 2:
11    print "Usage: %s <filename> [samplerate]" % sys.argv[0]
12    sys.exit(1)
13
14filename = sys.argv[1]
15
16samplerate = 0
17if len( sys.argv ) > 2: samplerate = int(sys.argv[2])
18
19s = source(filename, samplerate, hop_s)
20samplerate = s.samplerate
21o = onset("default", win_s, hop_s, samplerate)
22
23# list of onsets, in samples
24onsets = []
25
26# storage for plotted data
27desc = []
28tdesc = []
29allsamples_max = zeros(0,)
30downsample = 2  # to plot n samples / hop_s
31
32# total number of frames read
33total_frames = 0
34while True:
35    samples, read = s()
36    if o(samples):
37        print "%f" % (o.get_last_s())
38        onsets.append(o.get_last())
39    # keep some data to plot it later
40    new_maxes = (abs(samples.reshape(hop_s/downsample, downsample))).max(axis=0)
41    allsamples_max = hstack([allsamples_max, new_maxes])
42    desc.append(o.get_descriptor())
43    tdesc.append(o.get_thresholded_descriptor())
44    total_frames += read
45    if read < hop_s: break
46
47if 1:
48    # do plotting
49    from numpy import arange
50    import matplotlib.pyplot as plt
51    allsamples_max = (allsamples_max > 0) * allsamples_max
52    allsamples_max_times = [ float(t) * hop_s / downsample / samplerate for t in range(len(allsamples_max)) ]
53    plt1 = plt.axes([0.1, 0.75, 0.8, 0.19])
54    plt2 = plt.axes([0.1, 0.1, 0.8, 0.65], sharex = plt1)
55    plt.rc('lines',linewidth='.8')
56    plt1.plot(allsamples_max_times,  allsamples_max, '-b')
57    plt1.plot(allsamples_max_times, -allsamples_max, '-b')
58    for stamp in onsets:
59        stamp /= float(samplerate)
60        plt1.plot([stamp, stamp], [-1., 1.], '-r')
61    plt1.axis(xmin = 0., xmax = max(allsamples_max_times) )
62    plt1.xaxis.set_visible(False)
63    plt1.yaxis.set_visible(False)
64    desc_times = [ float(t) * hop_s / samplerate for t in range(len(desc)) ]
65    desc_plot = [d / max(desc) for d in desc]
66    plt2.plot(desc_times, desc_plot, '-g')
67    tdesc_plot = [d / max(desc) for d in tdesc]
68    for stamp in onsets:
69        stamp /= float(samplerate)
70        plt2.plot([stamp, stamp], [min(tdesc_plot), max(desc_plot)], '-r')
71    plt2.plot(desc_times, tdesc_plot, '-y')
72    plt2.axis(ymin = min(tdesc_plot), ymax = max(desc_plot))
73    plt.xlabel('time (s)')
74    #plt.savefig('/tmp/t.png', dpi=200)
75    plt.show()
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