main.py

#!/bin/env python3
import cv2
import numpy as np
import subprocess
import glob
from PIL import Image as im
from pynput.keyboard import Key, Listener
from pynput import keyboard 

def getdim():
    global t_width, t_height
    out = subprocess.Popen(['tput', 'cols'], 
        stdout=subprocess.PIPE, 
        stderr=subprocess.STDOUT)
    stdout,stderr = out.communicate()

    if stderr:
        t_width = 144
        t_height = 48
        print('tput not available, using fixed size')
        return

    t_width = int(stdout)

    out = subprocess.Popen(['tput', 'lines'], 
        stdout=subprocess.PIPE, 
        stderr=subprocess.STDOUT)
    stdout,stderr = out.communicate()

    t_height = int(stdout)


def gracefulquit():
    print(clear)
    print('releasing webcam')
    vid.release()

cameralist = glob.glob("/dev/video*")
if not cameralist:
    print("You do not have a working camera")
    exit(1)
else:
    print("Which camera to use? default=0")
    for i in range(len(cameralist)):
        print(i, cameralist[i])
    choice = input()
    choice = 0 if not choice else int(choice)
    if choice not in range(len(cameralist)):
        print('invalid choice')
        exit(1)
    else:
        vid = cv2.VideoCapture(cameralist[choice])

if not vid.isOpened():
    raise Exception("Could not open video device")

# symbols = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. "
symbols = '@#$%?*+;:,. '
print('inverted? Y/n')
clear = "\033[H\033[J"
if input() != 'n':
    symbols = symbols[::-1]
symlen = len(symbols)
output = ""

def save(filename, frame):
    textframe = ""
    textframeraw = ""
    frame = np.asarray(im.fromarray(frame).convert('L'))
    res = cv2.resize(frame, dsize=(t_width-1, t_height-1), interpolation=cv2.INTER_AREA)
    
    for row in res:
        for pixel in row:
            ind = round((pixel / 255) * (symlen-1))
            textframe += symbols [ ind ]
        textframe += "\n"
    
    with open(filename, 'w') as f:
        f.write(textframe)
    
    for row in frame:
        for pixel in row:
            ind = round((pixel / 255) * (symlen-1))
            textframeraw += symbols [ ind ]
        textframeraw += "\n"
    
    with open(filename + '.raw', 'w') as f:
        f.write(textframeraw)
    
def click(key): 
    try:
        if key.char == 'q': 
            gracefulquit()
            return False
    except AttributeError:
        if key == Key.space: 
            save('outputfile',frame)
  
# Collect all event until released 

listener = keyboard.Listener(
    on_press=click)
listener.start()

try:
    while(True):
        getdim()
        ret, frame = vid.read()
      
        height = len(frame)
        width = len(frame[0])

        res = cv2.resize(frame, dsize=(t_width-1, t_height-1), interpolation=cv2.INTER_AREA)
        res = np.asarray(im.fromarray(res).convert('L'))
        output = (clear) # clear screen
        for row in res:
            for pixel in row:
                ind = round((pixel / 255) * (symlen-1))
                ind = 0 if ind < 0 else ind
                output+=symbols [ ind ]
            output+="\n"
        print(output,end="")

except (KeyboardInterrupt, TypeError) as e:
    # After the loop release the cap object
    # Destroy all the windows
    gracefulquit()