def start_recording(self):
# Use a stream with a callback in non-blocking mode
self._stream = self._pa.open(format=pyaudio.paInt16,
channels=self.channels,
rate=self.rate,
input=True,
frames_per_buffer=self.frames_per_buffer,
stream_callback=self.get_callback())
self._stream.start_stream()
return self
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