1990-10-25 18:51:42 +00:00
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# Module 'Soundogram'
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import audio
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from Histogram import Histogram
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1991-12-26 13:06:29 +00:00
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class Soundogram(Histogram):
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1990-10-25 18:51:42 +00:00
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#
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def define(self, (win, chunk)):
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width, height = corner = win.getwinsize()
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bounds = (0, 0), corner
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self.chunk = chunk
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self.step = (len(chunk)-1)/(width/2+1) + 1
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ydata = _make_ydata(chunk, self.step)
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return Histogram.define(self, (win, bounds, ydata, (0, 128)))
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#
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def setchunk(self, chunk):
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self.chunk = chunk
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self.recompute()
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#
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def recompute(self):
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(left, top), (right, bottom) = self.bounds
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width = right - left
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self.step = (len(chunk)-1)/width + 1
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ydata = _make_ydata(chunk, self.step)
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self.setdata(ydata, (0, 128))
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#
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def _make_ydata(chunk, step):
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ydata = []
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for i in range(0, len(chunk), step):
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piece = audio.chr2num(chunk[i:i+step])
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mi, ma = min(piece), max(piece)
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y = max(abs(mi), abs(ma))
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ydata.append(y)
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return ydata
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