def _stream_callback(self, in_data, frame_count,
time_info, status_flags):
chunk = AudioChunk(start_time=time_info['input_buffer_adc_time'],
audio=in_data, freq=self._rate, width=2)
self._stream_queue.sync_q.put(chunk)
retflag = pyaudio.paContinue if self.running else pyaudio.paComplete
return (None, retflag)
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