import speech_recognition


def listen(rec, mic):
  with mic as source:
    print('adjusting mic for ambient noise..')
    rec.adjust_for_ambient_noise(source)
    print('listening..')
    # timeout is not max record time but max time it will wait for audio to start
    audio = rec.listen(source, timeout=5)
    try:
      print('sending audio to google..')
      outputString = rec.recognize_google(audio).lower()
    except speech_recognition.UnknownValueError:
      print('google was not able to transcribe the audio')
      return None
    except speech_recognition.RequestError:
      print('google API unreachable')
      return None
    except speech_recognition.WaitTimeoutError:
      print('timout expired while waiting for audio command to start')
      return None
    print('transcription '' + outputString + ''')
    return outputString


rec = sr.Recognizer()
mic = sr.Microphone()
outputString = listen(rec, mic)