source: python/demos/demo_waveform_plot.py @ daa0d5d

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since daa0d5d was daa0d5d, checked in by Paul Brossier <piem@piem.org>, 11 years ago

demos/demo_waveform_plot.py: improve

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1#! /usr/bin/env python
2
3import sys
4from aubio import pvoc, source
5from numpy import zeros, hstack
6
7def get_waveform_plot(filename, samplerate = 0, ax = None):
8    import matplotlib.pyplot as plt
9    if not ax:
10        fig = plt.figure()
11        ax = fig.add_subplot(111)
12    hop_s = 4096 # block size
13
14    allsamples_max = zeros(0,)
15    downsample = 2**3  # 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    print samples.reshape(hop_s/downsample, downsample).shape
29
30    allsamples_max = (allsamples_max > 0) * allsamples_max
31    allsamples_max_times = [ ( float (t) / downsample ) * hop_s for t in range(len(allsamples_max)) ]
32
33    ax.plot(allsamples_max_times,  allsamples_max, '-b')
34    ax.plot(allsamples_max_times, -allsamples_max, '-b')
35    ax.axis(xmin = allsamples_max_times[0], xmax = allsamples_max_times[-1])
36
37    if allsamples_max_times[-1] / float(samplerate) > 60:
38        ax.set_xlabel('time (mm:ss)')
39        ax.set_xticklabels([ "%02d:%02d" % (t/float(samplerate)/60, (t/float(samplerate))%60) for t in ax.get_xticks()[:-1]], rotation = 50)
40    else:
41        ax.set_xlabel('time (ss.mm)')
42        ax.set_xticklabels([ "%02d.%02d" % (t/float(samplerate), 100*((t/float(samplerate))%1) ) for t in ax.get_xticks()[:-1]], rotation = 50)
43if __name__ == '__main__':
44    import matplotlib.pyplot as plt
45    if len(sys.argv) < 2:
46        print "Usage: %s <filename>" % sys.argv[0]
47    else:
48        for soundfile in sys.argv[1:]:
49            get_waveform_plot(soundfile)
50            # display graph
51            plt.show()
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