MediaSession

if ("mediaSession" in navigator) {
  navigator.mediaSession.metadata = new MediaMetadata({
    title: "Unforgettable",
    artist: "Nat King Cole",
    album: "The Ultimate Collection (Remastered)",
    artwork: [
      {
        src: "https://dummyimage.com/96x96",
        sizes: "96x96",
        type: "image/png",
      },
      {
        src: "https://dummyimage.com/128x128",
        sizes: "128x128",
        type: "image/png",
      },
      {
        src: "https://dummyimage.com/192x192",
        sizes: "192x192",
        type: "image/png",
      },
      {
        src: "https://dummyimage.com/256x256",
        sizes: "256x256",
        type: "image/png",
      },
      {
        src: "https://dummyimage.com/384x384",
        sizes: "384x384",
        type: "image/png",
      },
      {
        src: "https://dummyimage.com/512x512",
        sizes: "512x512",
        type: "image/png",
      },
    ],
  });

  navigator.mediaSession.setActionHandler("play", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("pause", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("stop", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("seekbackward", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("seekforward", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("seekto", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("previoustrack", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("nexttrack", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("skipad", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("togglecamera", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("togglemicrophone", () => {
    /* Code excerpted. */
  });
  navigator.mediaSession.setActionHandler("hangup", () => {
    /* Code excerpted. */
  });
}

const actionHandlers = [
  // play
  [
    "play",
    async () => {
      // play our audio
      await audioEl.play();
      // set playback state
      navigator.mediaSession.playbackState = "playing";
      // update our status element
      updateStatus(allMeta[index], "Action: play  |  Track is playing…");
    },
  ],
  [
    "pause",
    () => {
      // pause out audio
      audioEl.pause();
      // set playback state
      navigator.mediaSession.playbackState = "paused";
      // update our status element
      updateStatus(allMeta[index], "Action: pause  |  Track has been paused…");
    },
  ],
];

for (const [action, handler] of actionHandlers) {
  try {
    navigator.mediaSession.setActionHandler(action, handler);
  } catch (error) {
    console.log(`The media session action "${action}" is not supported yet.`);
  }
}

try {
  navigator.mediaSession.setActionHandler("previousslide", () => {
    log('> User clicked "Previous Slide" icon.');
    if (slideNumber > 1) slideNumber--;
    updateSlide();
  });
} catch (error) {
  log('Warning! The "previousslide" media session action is not supported.');
}

try {
  navigator.mediaSession.setActionHandler("nextslide", () => {
    log('> User clicked "Next Slide" icon.');
    slideNumber++;
    updateSlide();
  });
} catch (error) {
  log('Warning! The "nextslide" media session action is not supported.');
}