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<html>
<head>
<title>MediaSessionDOMTest1</title>
</head>
<body>
<script>
function updatePositionState(event) {
if (event.target != active) {
return;
}
navigator.mediaSession.setPositionState({
duration: parseFloat(event.target.duration),
position: parseFloat(event.target.currentTime),
playbackRate: 1,
});
}
function updateMetadata() {
navigator.mediaSession.metadata = active.metadata;
}
function getTrack(offset) {
console.log("" + active.id + " " + offset);
const nextId = Math.min(
tracks.length - 1,
Math.max(0, parseInt(active.id) + offset)
);
return tracks[nextId];
}
navigator.mediaSession.setActionHandler("play", async () => {
updateMetadata();
await active.play();
});
navigator.mediaSession.setActionHandler("pause", () => {
active.pause();
});
navigator.mediaSession.setActionHandler("previoustrack", () => {
active = getTrack(-1);
});
navigator.mediaSession.setActionHandler("nexttrack", () => {
active = getTrack(1);
});
const audio1 = document.createElement("audio");
audio1.src = "audio/owl.mp3";
audio1.addEventListener("timeupdate", updatePositionState);
audio1.metadata = new window.MediaMetadata({
title: "hoot",
artist: "owl",
album: "hoots",
artwork: [
{
src: "images/test.gif",
type: "image/gif",
sizes: "265x199",
},
],
});
audio1.id = 0;
const audio2 = document.createElement("audio");
audio2.src = "audio/owl.mp3";
audio2.addEventListener("timeupdate", updatePositionState);
audio2.metadata = new window.MediaMetadata({
title: "hoot2",
artist: "stillowl",
album: "dahoots",
artwork: [
{
src: "images/test.gif",
type: "image/gif",
sizes: "265x199",
},
],
});
audio2.id = 1;
const audio3 = document.createElement("audio");
audio3.src = "audio/owl.mp3";
audio3.addEventListener("timeupdate", updatePositionState);
audio3.metadata = new window.MediaMetadata({
title: "hoot3",
artist: "immaowl",
album: "mahoots",
artwork: [
{
src: "images/test.gif",
type: "image/gif",
sizes: "265x199",
},
],
});
audio3.id = 2;
const tracks = [audio1, audio2, audio3];
let active = audio1;
window.onload = async () => {
active = getTrack(0);
updateMetadata();
await active.play();
};
</script>
</body>
</html>