shithub: aubio

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demos/demo_waveform_plot.py: improve

--- a/python/demos/demo_waveform_plot.py

+++ b/python/demos/demo_waveform_plot.py

@@ -9,10 +9,10 @@

     if not ax:

         fig = plt.figure()

         ax = fig.add_subplot(111)

-    hop_s = 512                                        # fft window size

+    hop_s = 4096 # block size

     allsamples_max = zeros(0,)

-    downsample = 2  # to plot n samples / hop_s

+    downsample = 2**3  # to plot n samples / hop_s

     a = source(filename, samplerate, hop_s)            # source file

     if samplerate == 0: samplerate = a.samplerate

@@ -25,6 +25,7 @@

         allsamples_max = hstack([allsamples_max, new_maxes])

         total_frames += read

         if read < hop_s: break

+    print samples.reshape(hop_s/downsample, downsample).shape

     allsamples_max = (allsamples_max > 0) * allsamples_max

     allsamples_max_times = [ ( float (t) / downsample ) * hop_s for t in range(len(allsamples_max)) ]

@@ -31,8 +32,16 @@

     ax.plot(allsamples_max_times,  allsamples_max, '-b')

     ax.plot(allsamples_max_times, -allsamples_max, '-b')

+    ax.axis(xmin = allsamples_max_times[0], xmax = allsamples_max_times[-1])

+    if allsamples_max_times[-1] / float(samplerate) > 60:

+        ax.set_xlabel('time (mm:ss)')

+        ax.set_xticklabels([ "%02d:%02d" % (t/float(samplerate)/60, (t/float(samplerate))%60) for t in ax.get_xticks()[:-1]], rotation = 50)

+    else:

+        ax.set_xlabel('time (ss.mm)')

+        ax.set_xticklabels([ "%02d.%02d" % (t/float(samplerate), 100*((t/float(samplerate))%1) ) for t in ax.get_xticks()[:-1]], rotation = 50)

 if __name__ == '__main__':

+    import matplotlib.pyplot as plt

     if len(sys.argv) < 2:

         print "Usage: %s <filename>" % sys.argv[0]

     else:

@@ -39,4 +48,4 @@

         for soundfile in sys.argv[1:]:

             get_waveform_plot(soundfile)

             # display graph

-            show()

+            plt.show()