app.js

// Set constraints for the video stream
const constraints = window.constraints = { video: { facingMode: "user" }, audio: false };

const video = document.getElementById('video')

Promise.all([
  faceapi.nets.tinyFaceDetector.loadFromUri('/models'),
  faceapi.nets.faceLandmark68Net.loadFromUri('/models'),
  faceapi.nets.faceRecognitionNet.loadFromUri('/models'),
  faceapi.nets.faceExpressionNet.loadFromUri('/models')
]).then(startVideo)

// Define constants
const cameraView = document.querySelector("#video"),
    cameraOutput = document.querySelector("#camera--output"),
    cameraSensor = document.querySelector("#camera--sensor"),
    cameraTrigger = document.querySelector("#camera--trigger")

// Access the device camera and stream to cameraView
function startVideo() {
    navigator.mediaDevices
        .getUserMedia(constraints)
        .then(function(stream) {
        track = stream.getTracks()[0];
        cameraView.srcObject = stream;
    })
    .catch(function(error) {
        console.error("Oops. Something is broken.", error);
    });
}

video.addEventListener('playing', () => {
    const canvas = faceapi.createCanvasFromMedia(video)
    document.body.append(canvas)
    const displaySize = { width: video.width, height: video.height }
    faceapi.matchDimensions(canvas, displaySize)
    setInterval(async () => {
        const detections = await faceapi.detectAllFaces(video, new faceapi.TinyFaceDetectorOptions()).withFaceLandmarks().withFaceExpressions()
        const resizedDetections = faceapi.resizeResults(detections, displaySize)
        canvas.getContext('2d').clearRect(0, 0, canvas.width, canvas.height)
        faceapi.draw.drawDetections(canvas, resizedDetections)
        faceapi.draw.drawFaceLandmarks(canvas, resizedDetections)
        faceapi.draw.drawFaceExpressions(canvas, resizedDetections)
    }, 100)
})

// Take a picture when cameraTrigger is tapped
// cameraTrigger.onclick = function() {
//     cameraSensor.width = cameraView.videoWidth;
//     cameraSensor.height = cameraView.videoHeight;
//     cameraSensor.getContext("2d").drawImage(cameraView, 0, 0);
//     cameraOutput.src = cameraSensor.toDataURL("image/webp");
//     cameraOutput.classList.add("taken");
// };

// Start the video stream when the window loads
// window.addEventListener("load", startVideo, false);x