#!/usr/bin/env nix-script
#!>python
#! python3 | pyaudio

## Listen to claps from the microphone.

import pyaudio
import audioop

settings = {
    "format": pyaudio.paInt16,
    "channels": 2,
    "rate": 44100,
    "input": True,
    "frames_per_buffer": 1024
}
audio = pyaudio.PyAudio()
stream = audio.open(**settings)
chunk = int(settings["rate"] * 0.025)

while True:
    noisy = 0
    for i in range(5):
        block = stream.read(chunk, exception_on_overflow=False)
        if audioop.rms(block, 2) > 100:
            noisy += 1
    if 3 <= noisy < 8:
        print("clap")