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<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>画面キャプチャをPiPで表示</title>
<style>
img {
width: 100%;
height: 100%;
object-fit: cover;
}
</style>
</head>
<body>
<button id="startCapture">画面キャプチャ開始</button>
<video id="video" autoplay hidden></video>
<canvas id="canvas" style="display:none;"></canvas>
<script>
const startButton = document.getElementById("startCapture");
const video = document.getElementById("video");
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
let pipWindow;
let img;
async function startCapture() {
try {
pipWindow = await documentPictureInPicture.requestWindow();
const stream = await navigator.mediaDevices.getDisplayMedia({ video: true });
video.srcObject = stream;
video.onloadedmetadata = () => {
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;
img = document.createElement("img");
img.style.width = "100%";
img.style.height = "100%";
img.style.objectFit = "cover";
pipWindow.document.body.appendChild(img);
updateFrame();
};
} catch (err) {
console.error("エラー: ", err);
}
}
function updateFrame() {
if (!pipWindow || pipWindow.closed) return;
ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
img.src = canvas.toDataURL("image/png");
requestAnimationFrame(updateFrame);
}
startButton.addEventListener("click", startCapture);
</script>
</body>
</html>
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