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