Realtime oscilloscope in 20 lines of Python, via soundcard & OpenCV

oscilloscope.py

import numpy as np
import cv2
import soundcard as sc        # Get it from https://github.com/bastibe/SoundCard
imWidth, imHeight = 1024, 512                       # screen size
def draw_wave(screen, mono_audio, xs, title="oscilloscope", gain=5):
    screen *= 0                                     # clear the screen
    ys = imHeight/2*(1 - np.clip( gain * mono_audio[0:len(xs)], -1, 1))  # the y-values of the waveform
    pts = np.array(list(zip(xs,ys))).astype(np.int) # pair up xs & ys
    cv2.polylines(screen,[pts],False,(0,255,0))     # connect points w/ lines
    cv2.imshow(title, screen)                       # show what we've got
default_mic = sc.default_microphone()
screen = np.zeros((imHeight,imWidth,3), dtype=np.uint8) # 3=color channels
xs = np.arange(imWidth).astype(np.int)                  # x values of pixels
while (1):                               # keep looping until someone stops this
    with default_mic.recorder(samplerate=44100) as mic:
        audio_data = mic.record(numframes=1024)  # get some audio from the mic
    draw_wave(screen, audio_data[:,0], xs)             # draw left channel
    key = cv2.waitKey(1) & 0xFF                        # keyboard input
    if ord('q') == key:                                # quit key
        break

@CrinSoft@ROmania-2023 - Python3: osc10l.py - DefaultMicrophone Oscilloscope in less than 10 lines of simple & clear Python code