how to activate the rear camera

[Abdoulaye sidibe]

how to activate the rear camera? When I launch the activation, the screen remains frozen
code : 

document.getElementById('camera-rotate').addEventListener('click', async (e) => {

e.preventDefault();

let elem = document.getElementById('camera-rotate');

let usingRearCamera = elem.getAttribute('data-using-rear-camera') === 'true';

let onPath = elem.querySelector('path.on');

let offPath = elem.querySelector('path.off');

// if (myStream) {

// myStream.getTracks().forEach(track => track.stop());

// }

try {

const desiredCamera = usingRearCamera ? "user" : "environment";

if (desiredCamera) {

const constraints = {

video: {

facingMode: { exact: desiredCamera } // Utilisez 'ideal' pour éviter les erreurs si la caméra n'est pas disponible

},

audio: true // Optionnel, si vous avez besoin de l'audio aussi

};

const stream = await navigator.mediaDevices.getUserMedia(constraints);

console.log('------------------ streamng----------------');

console.log(stream);

myStream = stream;

// Diffuse les nouvelles pistes vidéo et audio

broadcastNewCameraTracks(myStream, 'video', true);

// Met à jour l'état de la caméra et l'interface utilisateur

usingRearCamera = !usingRearCamera;

elem.setAttribute('data-using-rear-camera', usingRearCamera);

if (usingRearCamera) {

onPath.classList.remove('on');

onPath.classList.add('off');

offPath.classList.remove('off');

offPath.classList.add('on');

elem.classList.add('camera-off');

elem.setAttribute('title', 'Activer la caméra avant');

} else {

onPath.classList.remove('off');

onPath.classList.add('on');

offPath.classList.remove('on');

offPath.classList.add('off');

elem.setAttribute('title', 'Deactivate Rear Camera');

elem.classList.remove('camera-off');

}

} else {

console.error('No appropriate camera found.');

}

} catch (error) {

console.error('Error accessing camera:', error);

}

});

function broadcastNewCameraTracks(stream, type, mirrorMode = true) {

h.setLocalStream(stream, mirrorMode);

let track = type == 'audio' ? stream.getAudioTracks()[0] : stream.getVideoTracks()[0];

for (let p in pc) {

if (pc.hasOwnProperty(p)) {

let pName = pc[p];

if (typeof pName == 'object' && pName.replaceTrack) {

pName.replaceTrack(track);

}

}

}

}