Monitor input audio and only output when volume is sustained

monitor.py

# Sources:
# https://www.raspberrypi.org/forums/viewtopic.php?t=144374
# https://github.com/ev3dev/ev3dev/issues/198
# https://askubuntu.com/questions/71863/how-to-change-pulseaudio-sink-with-pacmd-set-default-sink-during-playback
# Remember to reboot

# CHANGE THESE
VOLUME_TRIGGER = 45 # Relative Decibels. Bigger number = louder
PROPORTION_TRIGGER = 0.5 # Should be between 0 (any peak, however short) and 1 (only continuous sound)
LENGTH_OF_SAMPLE = 5 # The period to look at in second

# YOU CAN CHANGE THESE BUT YOU SHOULDN'T NEED TO
PER_SECOND = 10 # Number of samples per second
RATE = 44100 # Audio quality
DISCONNECT_AFTER = 1 * PER_SECOND

# CHANGE THE BELOW AT YOUR OWN RISK
import pyaudio
import audioop
import math

p = pyaudio.PyAudio()
chunksize = int(RATE / PER_SECOND)
store = []
how_many_to_store = PER_SECOND * LENGTH_OF_SAMPLE
countdown_to_disccnnect = DISCONNECT_AFTER

input = p.open(format=pyaudio.paInt16,
               channels=2,
               rate=RATE,
               input=True,
               frames_per_buffer=chunksize)
output = None

def create_stream():
    global output
    if output is None:
        output = p.open(format=pyaudio.paInt16,
                        channels=2,
                        rate=RATE,
                        output=True,
                        frames_per_buffer=chunksize)

print( "Listening..." )

while True: # Loop forever
    data = input.read(chunksize)
    dB = 20 * math.log10( audioop.rms(data, 2) )

    # Let's keep a rotating list of whether the last x measurements triggered or not
    store.append( 1 if (dB > VOLUME_TRIGGER) else 0 )
    if len(store) == (how_many_to_store + 1):
        store.pop(0)
        # And if a certain proportion of them did, trigger our action
        if( sum(store)/how_many_to_store > PROPORTION_TRIGGER):
            if (dB > (VOLUME_TRIGGER - 10)):
                create_stream()
                output.write(data)
                countdown_to_disccnnect = DISCONNECT_AFTER
            else:
                countdown_to_disccnnect -= 1
                if countdown_to_disccnnect == 0 and output is not None:
                    output.close()