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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
p {
white-space: pre-wrap;
}
</style>
</head>
<body>
<h1 id="supportsFocusMode"></h1>
<h1>Supported constraints:</h1>
<p id="supportedConstraints"></p>
<h1>Available mediaDevices:</h1>
<p id="availableMediaDevices"></p>
<h1>Track capabitilies:</h1>
<div id="devices"></div>
<script>
const supportedConstraints = navigator.mediaDevices.getSupportedConstraints();
document.querySelector("#supportedConstraints").innerHTML = JSON.stringify(supportedConstraints, null, 4);
if (supportedConstraints.focusMode) {
document.querySelector("#supportsFocusMode").innerHTML = "Supports focusMode constraint";
} else {
document.querySelector("#supportsFocusMode").innerHTML = "Doesn't support focusMode constraint";
}
const printDeviceCapabilities = async (device) => {
try {
let mediaStream = await navigator.mediaDevices.getUserMedia({
video: {
deviceId: device.deviceId
}
});
const devices = document.querySelector("#devices");
const tracks = mediaStream.getTracks();
for (const track of tracks) {
const trackCapabilities = track.getCapabilities();
const trackCapabilitiesElement = document.createElement("p");
trackCapabilitiesElement.innerHTML = JSON.stringify(trackCapabilities, null, 4);
devices.appendChild(trackCapabilitiesElement);
track.stop();
}
mediaStream = null;
return Promise.resolve();
} catch (error) {
return Promise.reject(error);
}
}
navigator.mediaDevices.enumerateDevices().then(
async (availableMediaDevices) => {
document.querySelector("#availableMediaDevices").innerHTML = JSON.stringify(availableMediaDevices, null, 4);
for (const device of availableMediaDevices) {
try {
await printDeviceCapabilities(device);
} catch (error) {
console.error(error);
}
}
}
)
.catch(
(error) => {
console.error(error);
}
);
</script>
</body>
</html>