How to detect input audio existence and do action whenever it exists? - python-3.x

Question

I checked pyaudio but it offers the ability to record the input and manipulate it , i just want to do action when audio input exists.

Answer 1

You can implement a simple input audio detection by using PyAudio. You just need to decide what you mean with audio existence.
In the following example code I have used a simple root mean square calculation with a threshold. An other option is a peak test, just comparing the amplitude of each audio sample with a peak amplitude threshold. What is most useful for you depends on the application.
You can play around with the threshold value (i.e. the minimum amplitude or loudness of audio) and the chunk size (i.e. the latency of the audio detection) to get the behaviour you want.
import pyaudio
import math
RATE = 44100
CHUNK = 1024
AUDIO_EXISTENCE_THRESHOLD = 1000
def detect_input_audio(data, threshold):
if not data:
return False
rms = math.sqrt(sum([x**2 for x in data]) / len(data))
if rms > threshold:
return True
return False
audio = pyaudio.PyAudio()
stream = audio.open(format=pyaudio.paInt16, channels=1, input=True,
rate=RATE, frames_per_buffer=CHUNK)
data = []
while detect_input_audio(data, AUDIO_EXISTENCE_THRESHOLD):
data = stream.read(CHUNK)
# Do something when input audio exists
# ...
stream.stop_stream()
stream.close()
audio.terminate()