From daa0d5ddb8081b3cc2219fe641e622995b934966 Mon Sep 17 00:00:00 2001 From: Paul Brossier Date: Fri, 8 Mar 2013 19:20:39 -0500 Subject: [PATCH] demos/demo_waveform_plot.py: improve --- python/demos/demo_waveform_plot.py | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/python/demos/demo_waveform_plot.py b/python/demos/demo_waveform_plot.py index 11852a8f..7ab457a3 100755 --- a/python/demos/demo_waveform_plot.py +++ b/python/demos/demo_waveform_plot.py @@ -9,10 +9,10 @@ def get_waveform_plot(filename, samplerate = 0, ax = None): 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 @@ -25,18 +25,27 @@ def get_waveform_plot(filename, samplerate = 0, ax = None): 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)) ] 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 " % sys.argv[0] else: for soundfile in sys.argv[1:]: get_waveform_plot(soundfile) # display graph - show() + plt.show() -- 2.26.2