Showing the changes to python (1 of 1 file). Show all
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| @@ -9,10 +9,10 @@ def get_waveform_plot(filename, samplerate = 0, ax = None): · 8 unmodified lines | |||
| 9 | if not ax: | 9 | if not ax: |
| 10 | fig = plt.figure() | 10 | fig = plt.figure() |
| 11 | ax = fig.add_subplot(111) | 11 | ax = fig.add_subplot(111) |
| 12 | hop_s = 512 # fft window size | 12 | hop_s = 4096 # block size |
| 13 | 13 | ||
| 14 | allsamples_max = zeros(0,) | 14 | allsamples_max = zeros(0,) |
| 15 | downsample = 2 # to plot n samples / hop_s | 15 | downsample = 2**3 # to plot n samples / hop_s |
| 16 | 16 | ||
| 17 | a = source(filename, samplerate, hop_s) # source file | 17 | a = source(filename, samplerate, hop_s) # source file |
| 18 | if samplerate == 0: samplerate = a.samplerate | 18 | if samplerate == 0: samplerate = a.samplerate |
| @@ -25,18 +25,27 @@ def get_waveform_plot(filename, samplerate = 0, ax = None): · 6 unmodified lines | |||
| 25 | allsamples_max = hstack([allsamples_max, new_maxes]) | 25 | allsamples_max = hstack([allsamples_max, new_maxes]) |
| 26 | total_frames += read | 26 | total_frames += read |
| 27 | if read < hop_s: break | 27 | if read < hop_s: break |
| 28 | print samples.reshape(hop_s/downsample, downsample).shape | ||
| 28 | 29 | ||
| 29 | allsamples_max = (allsamples_max > 0) * allsamples_max | 30 | allsamples_max = (allsamples_max > 0) * allsamples_max |
| 30 | allsamples_max_times = [ ( float (t) / downsample ) * hop_s for t in range(len(allsamples_max)) ] | 31 | allsamples_max_times = [ ( float (t) / downsample ) * hop_s for t in range(len(allsamples_max)) ] |
| 31 | 32 | ||
| 32 | ax.plot(allsamples_max_times, allsamples_max, '-b') | 33 | ax.plot(allsamples_max_times, allsamples_max, '-b') |
| 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]) | ||
| 34 | 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) | ||
| 35 | if __name__ == '__main__': | 43 | if __name__ == '__main__': |
| 44 | import matplotlib.pyplot as plt | ||
| 36 | if len(sys.argv) < 2: | 45 | if len(sys.argv) < 2: |
| 37 | print "Usage: %s <filename>" % sys.argv[0] | 46 | print "Usage: %s <filename>" % sys.argv[0] |
| 38 | else: | 47 | else: |
| 39 | for soundfile in sys.argv[1:]: | 48 | for soundfile in sys.argv[1:]: |
| 40 | get_waveform_plot(soundfile) | 49 | get_waveform_plot(soundfile) |
| 41 | # display graph | 50 | # display graph |
| 42 | show() | 51 | plt.show() |