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2_3_OffscreenCanvas.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>2. OffscreenCanvas</title>
</head>
<body>
<div>
<button type="button" id="btn">start play</button>
</div>
<video id="mix" width="640" height="480" autoplay></video>
<div style="position: absolute;right:0;top: 0" id="stat"></div>
</body>
<script src="common/stat.js"></script>
<script type="module">
import { getUserStream, getScreenStream, WIDTH, HEIGHT } from "./common/common.js";
let userStream, screenStream, worker, userCapture, screenCapture;
const stats = new Stats();
document.getElementById("stat").appendChild(stats.domElement);
document.getElementById('btn').addEventListener('click', () => { start() });
const canvas = document.createElement('canvas');
canvas.width = WIDTH;
canvas.height = HEIGHT;
const offscreen = canvas.transferControlToOffscreen();
worker = new Worker('./worker/offscreenCanvas-transfer.js');
worker.postMessage({ action: 'init', offscreen: offscreen }, [offscreen]);
async function start() {
try {
userStream = await getUserStream();
screenStream = await getScreenStream();
userCapture = new ImageCapture(userStream.getVideoTracks()[0]);
screenCapture = new ImageCapture(screenStream.getVideoTracks()[0]);
await render();
document.getElementById('mix').srcObject = canvas.captureStream();
} catch (err) {
console.error(err);
}
}
async function render() {
stats.begin();
let userImageBitMap = await userCapture.grabFrame();
let screenImageBitMap = await screenCapture.grabFrame();
worker.postMessage({
action: 'render',
user: userImageBitMap,
screen: screenImageBitMap
});
stats.end();
requestAnimationFrame(render);
}
</script>
</html>