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MicrophoneStream.py
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MicrophoneStream.py
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import queue
import time
import pyaudio
class MicrophoneStream(object):
"""Opens a recording stream as a generator yielding the audio chunks."""
def __init__(self, rate, chunk, device_index):
self._rate = rate
self._chunk = chunk
self._device_index = device_index
# Create a thread-safe buffer of audio data
self._buff = queue.Queue()
self.closed = True
self._last_chunk_time = time.time()
def __enter__(self):
self._audio_interface = pyaudio.PyAudio()
self._audio_stream = self._audio_interface.open(
format=pyaudio.paInt16,
channels=1, rate=self._rate,
input=True, frames_per_buffer=self._chunk,
stream_callback=self._fill_buffer,
input_device_index=self._device_index
)
self.closed = False
return self
def __exit__(self, type, value, traceback):
self._audio_stream.stop_stream()
self._audio_stream.close()
self.closed = True
self._buff.put(None)
self._audio_interface.terminate()
def _fill_buffer(self, in_data, frame_count, time_info, status_flags):
"""Continuously collect data from the audio stream, into the buffer."""
self._buff.put(in_data)
self._last_chunk_time = time.time() # Update the timestamp
return None, pyaudio.paContinue
def generator(self):
while not self.closed:
chunk = self._buff.get()
if chunk is None:
return
data = [chunk]
while True:
try:
chunk = self._buff.get(block=False)
if chunk is None:
return
data.append(chunk)
except queue.Empty:
break
yield b''.join(data)
def stop(self):
if hasattr(self, '_audio_stream'):
self._audio_stream.stop_stream()
self._audio_stream.close()
self.closed = True
self._buff.put(None)
if hasattr(self, '_audio_interface'):
self._audio_interface.terminate()
def pause(self):
self._audio_stream.stop_stream()
def resume(self):
self._audio_stream.start_stream()