Skeleton for on-line voice modification scripts. Requires numpy and PyAudio

voicemod.py

import pyaudio
import numpy as np

FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100
CHUNK = 1024

audio = pyaudio.PyAudio()

def audioIn():

    stream = audio.open(format=FORMAT, channels=CHANNELS, rate=RATE, input=True, frames_per_buffer=CHUNK)
    prev = np.zeros(1024)
    new_data = np.zeros(1024)
    while True:
        prev = new_data
        new_data = (np.fromstring(stream.read(CHUNK), dtype=np.int16) / (2**15) + 1) / 2
        yield prev, new_data

def audioOut():
    stream = audio.open(output=True, channels=CHANNELS, rate=RATE, format=pyaudio.paInt16)
    while True:
        input_data = yield
        input_data = ((input_data*2 - 1)*(2**15)).astype(np.int16)
        stream.write(input_data.tostring())

sink = audioOut()
next(sink)

sink.send(np.zeros(CHUNK*10))

for previous, current in audioIn():

    # Do modifications here

    sink.send(current)