48 lines
975 B
Python
48 lines
975 B
Python
# Module 'VUMeter'
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import audio
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from StripChart import StripChart
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K = 1024
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Rates = [0, 32*K, 16*K, 8*K]
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class VUMeter() = StripChart():
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#
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# Override define() and timer() methods
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#
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def define(self, parent):
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self = StripChart.define(self, (parent, 128))
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self.parent.need_timer(self)
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self.sampling = 0
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self.rate = 3
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self.enable(0)
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return self
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#
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def timer(self):
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if self.sampling:
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chunk = audio.wait_recording()
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self.sampling = 0
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nums = audio.chr2num(chunk)
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ampl = max(abs(min(nums)), abs(max(nums)))
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self.append(ampl)
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if self.enabled and not self.sampling:
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audio.setrate(self.rate)
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size = Rates[self.rate]/10
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size = size/48*48
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audio.start_recording(size)
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self.sampling = 1
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if self.sampling:
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self.parent.settimer(1)
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#
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# New methods: start() and stop()
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#
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def stop(self):
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if self.sampling:
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chunk = audio.stop_recording()
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self.sampling = 0
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self.enable(0)
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#
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def start(self):
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self.enable(1)
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self.timer()
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