Media Session API 可讓網站讓使用者瞭解瀏覽器目前播放的內容,且無需返回至啟動該 API 的頁面即可控制目前播放的內容。使用者可以透過自訂媒體通知的中繼資料、媒體事件 (例如播放、暫停、跳轉和追蹤異動) 來自訂使用者體驗。這些自訂設定適用於多種情境,包括電腦媒體中心、行動裝置的媒體通知,甚至是穿戴式裝置。
網站播放音訊或視訊時,使用者會在行動裝置的通知匣或電腦版媒體中心自動收到媒體通知。瀏覽器會盡可能使用文件標題和所找到的最大圖示圖片,來顯示適當的資訊。Media Session API 可讓您使用更豐富的媒體中繼資料 (例如標題、演出者名稱、專輯名稱和圖片) 自訂媒體通知,如下所示。
以下範例說明如何建立自訂媒體通知,以及回應播放和暫停等基本媒體動作。
const video = document.querySelector("video");
navigator.mediaSession.metadata = new MediaMetadata({
title: "Never Gonna Give You Up",
artist: "Rick Astley",
album: "Whenever You Need Somebody",
artwork: [
{ src: "https://via.placeholder.com/96", sizes: "96x96" },
{ src: "https://via.placeholder.com/128", sizes: "128x128" },
{ src: "https://via.placeholder.com/256", sizes: "256x256" },
{ src: "https://via.placeholder.com/512", sizes: "512x512" },
],
});
navigator.mediaSession.setActionHandler("play", async () => {
// Resume playback
try {
await video.play();
} catch (err) {
console.error(err.name, err.message);
}
});
navigator.mediaSession.setActionHandler("pause", () => {
// Pause active playback
video.pause();
});
video.addEventListener("play", () => {
navigator.mediaSession.playbackState = "playing";
});
video.addEventListener("pause", () => {
navigator.mediaSession.playbackState = "paused";
});
其他資訊
操作示範
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="icon"
href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>📺</text></svg>"
/>
<title>How to customize media notifications</title>
</head>
<body>
<h1>How to customize media notifications</h1>
<video controls playsinline src="https://storage.googleapis.com/media-session/caminandes/short.mp4"></video>
<p>Credits: Media files are © copyright Blender Foundation | <a href="https://www.blender.org">www.blender.org</a>.</p>
</body>
</html>
CSS
:root {
color-scheme: dark light;
}
html {
box-sizing: border-box;
}
*,
*:before,
*:after {
box-sizing: inherit;
}
body {
margin: 1rem;
font-family: system-ui, sans-serif;
}
video {
display: block;
margin-top: 10px;
max-width: 100%;
}
JS
const video = document.querySelector("video");
navigator.mediaSession.metadata = new MediaMetadata({
title: "Caminandes 2: Gran Dillama - Blender Animated Short",
artist: "Blender Foundation",
artwork: [
{ src: "https://storage.googleapis.com/media-session/caminandes/artwork-96.png", sizes: "96x96" },
{ src: "https://storage.googleapis.com/media-session/caminandes/artwork-128.png", sizes: "128x128" },
{ src: "https://storage.googleapis.com/media-session/caminandes/artwork-256.png", sizes: "256x256" },
{ src: "https://storage.googleapis.com/media-session/caminandes/artwork-512.png", sizes: "512x512" },
],
});
navigator.mediaSession.setActionHandler("play", async () => {
// Resume playback
try {
await video.play();
} catch (err) {
console.error(err.name, err.message);
}
});
navigator.mediaSession.setActionHandler("pause", () => {
// Pause active playback
video.pause();
});
video.addEventListener("play", () => {
navigator.mediaSession.playbackState = "playing";
});
video.addEventListener("pause", () => {
navigator.mediaSession.playbackState = "paused";
});