source: python/demos/demo_waveform_plot.py @ 4120fbc

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 4120fbc was 4120fbc, checked in by Paul Brossier <piem@piem.org>, 3 years ago

python/demos: python3 and double precision compatibility

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1#! /usr/bin/env python
2
3import sys
4from aubio import source
5from numpy import zeros, hstack
6
7def get_waveform_plot(filename, samplerate = 0, block_size = 4096, ax = None, downsample = 2**4):
8    import matplotlib.pyplot as plt
9    if not ax:
10        fig = plt.figure()
11        ax = fig.add_subplot(111)
12    hop_s = block_size
13
14    allsamples_max = zeros(0,)
15    downsample = downsample  # to plot n samples / hop_s
16
17    a = source(filename, samplerate, hop_s)            # source file
18    if samplerate == 0: samplerate = a.samplerate
19
20    total_frames = 0
21    while True:
22        samples, read = a()
23        # keep some data to plot it later
24        new_maxes = (abs(samples.reshape(hop_s//downsample, downsample))).max(axis=0)
25        allsamples_max = hstack([allsamples_max, new_maxes])
26        total_frames += read
27        if read < hop_s: break
28    allsamples_max = (allsamples_max > 0) * allsamples_max
29    allsamples_max_times = [ ( float (t) / downsample ) * hop_s for t in range(len(allsamples_max)) ]
30
31    ax.plot(allsamples_max_times,  allsamples_max, '-b')
32    ax.plot(allsamples_max_times, -allsamples_max, '-b')
33    ax.axis(xmin = allsamples_max_times[0], xmax = allsamples_max_times[-1])
34
35    set_xlabels_sample2time(ax, allsamples_max_times[-1], samplerate)
36    return ax
37
38def set_xlabels_sample2time(ax, latest_sample, samplerate):
39    ax.axis(xmin = 0, xmax = latest_sample)
40    if latest_sample / float(samplerate) > 60:
41        ax.set_xlabel('time (mm:ss)')
42        ax.set_xticklabels([ "%02d:%02d" % (t/float(samplerate)/60, (t/float(samplerate))%60) for t in ax.get_xticks()[:-1]], rotation = 50)
43    else:
44        ax.set_xlabel('time (ss.mm)')
45        ax.set_xticklabels([ "%02d.%02d" % (t/float(samplerate), 100*((t/float(samplerate))%1) ) for t in ax.get_xticks()[:-1]], rotation = 50)
46
47
48if __name__ == '__main__':
49    import matplotlib.pyplot as plt
50    if len(sys.argv) < 2:
51        print("Usage: %s <filename>" % sys.argv[0])
52    else:
53        for soundfile in sys.argv[1:]:
54            get_waveform_plot(soundfile)
55            # display graph
56            plt.show()
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