Changeset 1eee405 for python/demos

Timestamp:

Mar 22, 2013, 5:42:17 PM (12 years ago)

Author:

Paul Brossier <piem@piem.org>

Branches:

feature/autosink, feature/cnn, feature/cnn_org, feature/constantq, feature/crepe, feature/crepe_org, feature/pitchshift, feature/pydocstrings, feature/timestretch, fix/ffmpeg5, master, pitchshift, sampler, timestretch, yinfft+

Children:

1e90588

Parents:

b429b68

Message:

python/demos/demo_waveform_plot.py: plot more samples, add hop_size parameter, add set_xlabels_sample2time

File:

• python/demos/demo_waveform_plot.py (modified) (4 diffs)

python/demos/demo_waveform_plot.py

@@ -5 +5 @@
 from numpy import zeros, hstack
 
-def get_waveform_plot(filename, samplerate = 0, ax = None):
+def get_waveform_plot(filename, samplerate = 0, block_size = 4096, ax = None):
     import matplotlib.pyplot as plt
     if not ax:
         fig = plt.figure()
         ax = fig.add_subplot(111)
-    hop_s = 4096 # block size
+    hop_s = block_size
 
     allsamples_max = zeros(0,)
-    downsample = 2**3  # to plot n samples / hop_s
+    downsample = 2**4  # to plot n samples / hop_s
 
     a = source(filename, samplerate, hop_s)            # source file
@@ -26 +26 @@
         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)) ]
@@ -35 +33 @@
     ax.axis(xmin = allsamples_max_times[0], xmax = allsamples_max_times[-1])
 
-    if allsamples_max_times[-1] / float(samplerate) > 60:
+    set_xlabels_sample2time(ax, allsamples_max_times[-1], samplerate)
+    return ax
+
+def set_xlabels_sample2time(ax, latest_sample, samplerate):
+    if latest_sample / 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)
@@ -41 +43 @@
         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