import cv2
import mediapipe as mp

mp_drawing = mp.solutions.drawing_utils
mp_face_mesh = mp.solutions.face_mesh

drawing_spec = mp_drawing.DrawingSpec(thickness = 1, circle_radius = 1)

cap = cv2.VideoCapture(0)
ratio = cap.get(cv2.CAP_PROP_FRAME_WIDTH) / cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
WIDTH = 400
HEIGHT = int(WIDTH / ratio)

face_mesh = mp_face_mesh.FaceMesh(min_detection_confidence = 0.5, min_tracking_confidence = 0.5)

while cap.isOpened():
    ret, frame = cap.read()

    if ret:
        frame = cv2.resize(frame, (WIDTH, HEIGHT))
        frame = cv2.rotate(frame, rotateCode = 1)
        frame = cv2.flip(frame, 1)

        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        frame.flags.writeable = False
        results = face_mesh.process(frame)
        frame.flags.writeable = True
        frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)

        if results.multi_face_landmarks:
            for face_landmarks in results.multi_face_landmarks:
                mp_drawing.draw_landmarks(image = frame,
                   landmark_list = face_landmarks,
                   connections = mp_face_mesh.FACE_CONNECTIONS,
                   landmark_drawing_spec = drawing_spec,
                   connection_drawing_spec = drawing_spec)

        cv2.imshow("MediaPipe FaceMesh", frame)

    if cv2.waitKey(1) == 27:
        break

cap.release()
cv2.destroyAllWindows()