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annotate light9/wavepoints.py @ 1832:84306c05d229

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sequencer http mode: send faster (this gets 13fps) Ignore-this: 42794350c8f87faec4392591184e8065
author drewp@bigasterisk.com
date Sat, 09 Jun 2018 18:42:06 +0000
parents 4a51d4eefa95
children f066d6e874db
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4a51d4eefa95 add wavecurve from semprini with new cmdline ui
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1 from __future__ import division
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2 import wave, audioop
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3
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4 def simp(filename, seconds_per_average=0.001):
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5 """smaller seconds_per_average means fewer data points"""
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6 wavefile = wave.open(filename, 'rb')
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7 print "# gnuplot data for %s, seconds_per_average=%s" % \
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8 (filename, seconds_per_average)
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9 print "# %d channels, samplewidth: %d, framerate: %s, frames: %d\n# Compression type: %s (%s)" % wavefile.getparams()
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10
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11 framerate = wavefile.getframerate() # frames / second
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12 frames_to_read = int(framerate * seconds_per_average)
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13 print "# frames_to_read=%s" % frames_to_read
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14
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15 time_and_max = []
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16 values = []
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17 count = 0
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18 while 1:
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19 fragment = wavefile.readframes(frames_to_read)
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20 if not fragment:
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21 break
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22
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23 # other possibilities:
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24 # m = audioop.avg(fragment, 2)
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25 # print count, "%s %s" % audioop.minmax(fragment, 2)
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26
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27 m = audioop.rms(fragment, wavefile._framesize)
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28 time_and_max.append((count, m))
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29 values.append(m)
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30 count += frames_to_read
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31 # if count>1000000:
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32 # break
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33
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34 # find the min and max
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35 min_value, max_value = min(values), max(values)
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36 points = [] # (secs,height)
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37 for count, value in time_and_max:
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38 points.append((count/framerate,
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39 (value - min_value) / (max_value - min_value)))
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40 return points