rick rolling in ascii!

rickroll.py

import curses
from itertools import product
from time import time, sleep

import cv2
import numpy as np


path = "never_gonna.mp4"

ASCII_MAP = np.array(list(' .,:;<+*LtCa4U80dQM@'))
SCALE = len(ASCII_MAP) / 255

VALUES = [255 // 5 * i for i in range(6)]
COLOR_MAP = np.array([min(range(6), key=lambda index: abs(VALUES[index] - color)) for color in range(256)])
BASE_6 = np.array([36, 6, 1])

def init_curses(screen):
    curses.noecho()
    curses.cbreak()
    screen.nodelay(1)
    curses.curs_set(0)

    curses.start_color()
    for x, y, z in product(range(6), repeat=3):
        curses.init_color(x * 6 ** 2 + y * 6 + z + 17, *(round(1000 / 255 * VALUES[i]) for i in (z, y, x)))

    for i in range(6 ** 3):
        curses.init_pair(i + 1, i + 17, 0)

    screen.clear()

def main(screen):
    init_curses(screen)
    curses_pairs = np.array([curses.color_pair(i) for i in range(1, 6 ** 3 + 1)])
    h, w = screen.getmaxyx()
    dim = w - 1, h

    movie = cv2.VideoCapture(path)

    start = time()
    while screen.getch() != ord('q'):
        read_flag, frame = movie.read()
        if not read_flag:
            break

        color = cv2.resize(frame, dim)
        grayscale = ASCII_MAP[ (SCALE * cv2.cvtColor(color, cv2.COLOR_BGR2GRAY)).astype(int) ]
        pairs = curses_pairs[(BASE_6 * COLOR_MAP[color]).sum(axis=-1)]

        it = np.nditer((grayscale, pairs), ["multi_index"])
        for char, pair in it:
            y, x = it.multi_index
            screen.addstr(y, x, str(char), pair)

        delta = movie.get(cv2.CAP_PROP_POS_MSEC) / 1000 - (time() - start)
        if delta > 0:
            sleep(delta)

        screen.refresh()

    movie.release()

if __name__ == '__main__':
    curses.wrapper(main)

you are evil 🤣