camera.py

import config
from time import gmtime, strftime, sleep
import cv2
import time
import subprocess
import logging

def takePhoto():
    photoTitle = config.FOLDER_PHOTOS_ORIGINAL + "photobooth_" + strftime("%Y-%m-%d_%H%M%S", gmtime()) + ".jpg"
    camera_port = 0
    camera = cv2.VideoCapture(camera_port)
    time.sleep(0.1)  # If you don't wait, the image will be dark
    return_value, image = camera.read()
    cv2.imwrite(photoTitle, image)
    del(camera)
    return photoTitle

def actuate_camera_shutter(img_size):
    '''
    Actuates the camera and downloads the image onto the Raspberry Pi
    :return: the filepath of the photo taken
    '''

    image_name = "photobooth_" + strftime("%Y-%m-%d_%H%M%S", gmtime()) + ".jpg"
    image_filepath = config.FOLDER_PHOTOS_ORIGINAL + image_name
    gpout = ""

    try:
        gpout = subprocess.check_output("gphoto2 --set-config /main/imgsettings/imagesize=" + str(img_size), stderr=subprocess.STDOUT, shell=True)
        gpout = subprocess.check_output("gphoto2 --capture-image-and-download --keep --filename " + image_filepath, stderr=subprocess.STDOUT, shell=True)

        # CalledProcessError is raised when the camera is turned off (or battery dies?)

        #if "ERROR" in gpout:
        print(gpout)
        #    logging.error(gpout)
        #    raise IOError("Not able to take photo as the command failed for photo " + image_filepath)

    except subprocess.CalledProcessError as e:
        logging.error("Unable to take photo, likely due to camera not responding - check batteries")
        logging.error(e)
        raise

    except Exception as e:
        logging.error("Unable to take photo as the command failed for photo " + image_filepath)
        logging.error(e)
        raise
    else:
        return image_filepath