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# Module 'Soundogram'
import audio
from Histogram import Histogram
class Soundogram(Histogram):
#
def define(self, win, chunk):
width, height = corner = win.getwinsize()
bounds = (0, 0), corner
self.chunk = chunk
self.step = (len(chunk)-1)/(width/2+1) + 1
ydata = _make_ydata(chunk, self.step)
return Histogram.define(self, (win, bounds, ydata, (0, 128)))
#
def setchunk(self, chunk):
self.chunk = chunk
self.recompute()
#
def recompute(self):
(left, top), (right, bottom) = self.bounds
width = right - left
self.step = (len(chunk)-1)/width + 1
ydata = _make_ydata(chunk, self.step)
self.setdata(ydata, (0, 128))
#
def _make_ydata(chunk, step):
ydata = []
for i in range(0, len(chunk), step):
piece = audio.chr2num(chunk[i:i+step])
mi, ma = min(piece), max(piece)
y = max(abs(mi), abs(ma))
ydata.append(y)
return ydata
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