WebcamVideoStream.py

from threading import Thread

import cv2


class WebcamVideoStream:
    def __init__(self, src=0):

        # Initialize webcam stream and read the first frame from the stream
        self.stream = cv2.VideoCapture(src)
        (self.grabbed, self.frame) = self.stream.read()

        # Variable indicating whether the thread should be stopped
        self.stopped = False

    def start(self):

        # start the thread to read frames from the webcam stream
        Thread(target=self.update, args=()).start()
        return self

    def update(self):

        # Endless loop until the thread stops
        while True:

            # If the thread indicator variable is set, it stops the thread
            if self.stopped:
                return

            # Otherwise, the next frame is read from the stream
            (self.grabbed, self.frame) = self.stream.read()

    def read(self):

        # returns the last frame
        return self.frame

    def stop(self):

        # indicates that the thread should be stopped
        self.stopped = True