ref: 2a14820a54dc6147abcd3c8eabd2eb0eaa5e9755
dir: /python/demos/demo_onset_plot.py/
#! /usr/bin/env python import sys from aubio import onset, source from numpy import array, hstack, zeros win_s = 512 # fft size hop_s = win_s / 2 # hop size if len(sys.argv) < 2: print "Usage: %s <filename> [samplerate]" % sys.argv[0] sys.exit(1) filename = sys.argv[1] samplerate = 0 if len( sys.argv ) > 2: samplerate = int(sys.argv[2]) s = source(filename, samplerate, hop_s) samplerate = s.samplerate o = onset("default", win_s, hop_s, samplerate) # list of onsets, in samples onsets = [] # storage for plotted data desc = [] tdesc = [] allsamples_max = zeros(0,) downsample = 2 # to plot n samples / hop_s # total number of frames read total_frames = 0 while True: samples, read = s() if o(samples): print "%f" % (o.get_last_s()) onsets.append(o.get_last()) # keep some data to plot it later new_maxes = (abs(samples.reshape(hop_s/downsample, downsample))).max(axis=0) allsamples_max = hstack([allsamples_max, new_maxes]) desc.append(o.get_descriptor()) tdesc.append(o.get_thresholded_descriptor()) total_frames += read if read < hop_s: break if 1: # do plotting from numpy import arange import matplotlib.pyplot as plt allsamples_max = (allsamples_max > 0) * allsamples_max allsamples_max_times = [ float(t) * hop_s / downsample / samplerate for t in range(len(allsamples_max)) ] plt1 = plt.axes([0.1, 0.75, 0.8, 0.19]) plt2 = plt.axes([0.1, 0.1, 0.8, 0.65], sharex = plt1) plt.rc('lines',linewidth='.8') plt1.plot(allsamples_max_times, allsamples_max, '-b') plt1.plot(allsamples_max_times, -allsamples_max, '-b') for stamp in onsets: stamp /= float(samplerate) plt1.plot([stamp, stamp], [-1., 1.], '-r') plt1.axis(xmin = 0., xmax = max(allsamples_max_times) ) plt1.xaxis.set_visible(False) plt1.yaxis.set_visible(False) desc_times = [ float(t) * hop_s / samplerate for t in range(len(desc)) ] desc_plot = [d / max(desc) for d in desc] plt2.plot(desc_times, desc_plot, '-g') tdesc_plot = [d / max(desc) for d in tdesc] for stamp in onsets: stamp /= float(samplerate) plt2.plot([stamp, stamp], [min(tdesc_plot), max(desc_plot)], '-r') plt2.plot(desc_times, tdesc_plot, '-y') plt2.axis(ymin = min(tdesc_plot), ymax = max(desc_plot)) plt.xlabel('time (s)') #plt.savefig('/tmp/t.png', dpi=200) plt.show()