#PulseMmonitor.py
import pyaudio
import numpy as np
import matplotlib.pyplot as plt
import cv2

def streamandshow():
    CHUNK = 1024
    FORMAT = pyaudio.paInt16
    CHANNELS = 2
    RATE = 44100
    RECORD_SECONDS = 0.12

    p = pyaudio.PyAudio()

    stream = p.open(format = FORMAT,
                    channels = CHANNELS,
                    rate = RATE,
                    input = True,
                    frames_per_buffer = CHUNK)

    frames = []

    for i in range(int(RATE * RECORD_SECONDS // CHUNK)):
        data_raw = stream.read(CHUNK)
        frames.append(data_raw)

    frames_int16 = np.array(frames)

    stream.stop_stream()
    stream.close()
    p.terminate()

    data = np.frombuffer(frames_int16, dtype='int16')
    data_l = data[::2]
    data_max = max(data_l)
    print(data_max)

    fig = plt.figure(num = 1, figsize = (6, 4))
    plt.plot(data_l[100:])
    plt.pause(0.3)
    plt.clf()

while True:
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
    streamandshow()