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demos/demo_waveform_plot.py: add downsample parameter

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

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

@@ -4,7 +4,7 @@

 from aubio import pvoc, source

 from numpy import zeros, hstack

-def get_waveform_plot(filename, samplerate = 0, block_size = 4096, ax = None):

+def get_waveform_plot(filename, samplerate = 0, block_size = 4096, ax = None, downsample = 2**4):

     import matplotlib.pyplot as plt

     if not ax:

         fig = plt.figure()

@@ -12,7 +12,7 @@

     hop_s = block_size

     allsamples_max = zeros(0,)

-    downsample = 2**4  # to plot n samples / hop_s

+    downsample = downsample  # to plot n samples / hop_s

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

     if samplerate == 0: samplerate = a.samplerate