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