התאמה אישית של התראות מדיה וטיפול בפלייליסטים

if ('mediaSession' in navigator) {

    navigator.mediaSession.metadata = new MediaMetadata({
    title: 'Never Gonna Give You Up',
    artist: 'Rick Astley',
    album: 'Whenever You Need Somebody',
    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', function() {});
    navigator.mediaSession.setActionHandler('pause', function() {});
    navigator.mediaSession.setActionHandler('seekbackward', function() {});
    navigator.mediaSession.setActionHandler('seekforward', function() {});
    navigator.mediaSession.setActionHandler('previoustrack', function() {});
    navigator.mediaSession.setActionHandler('nexttrack', function() {});
}

<audio controls>
    <source src="audio.mp3" type="audio/mp3"/>
    <source src="audio.ogg" type="audio/ogg"/>
</audio>

playButton.addEventListener('pointerup', function(event) {
    let audio = document.querySelector('audio');

    // User interacted with the page. Let's play audio...
    audio.play()
    .then(_ => { /* Set up media session... */ })
    .catch(error => { console.log(error) });
});

let audio = document.querySelector('audio');

welcomeButton.addEventListener('pointerup', function(event) {
  // User interacted with the page. Let's load audio...
  <strong>audio.load()</strong>
  .then(_ => { /* Show play button for instance... */ })
  .catch(error => { console.log(error) });
});

// Later...
playButton.addEventListener('pointerup', function(event) {
  <strong>audio.play()</strong>
  .then(_ => { /* Set up media session... */ })
  .catch(error => { console.log(error) });
});

// When audio starts playing...
if ('mediaSession' in navigator) {

    navigator.mediaSession.metadata = new MediaMetadata({
    title: 'Never Gonna Give You Up',
    artist: 'Rick Astley',
    album: 'Whenever You Need Somebody',
    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' },
    ]
    });
}

let audio = document.createElement('audio');

let playlist = ['audio1.mp3', 'audio2.mp3', 'audio3.mp3'];
let index = 0;

navigator.mediaSession.setActionHandler('previoustrack', function() {
    // User clicked "Previous Track" media notification icon.
    index = (index - 1 + playlist.length) % playlist.length;
    playAudio();
});

navigator.mediaSession.setActionHandler('nexttrack', function() {
    // User clicked "Next Track" media notification icon.
    index = (index + 1) % playlist.length;
    playAudio();
});

function playAudio() {
    audio.src = playlist[index];
    audio.play()
    .then(_ => { /* Set up media session... */ })
    .catch(error => { console.log(error); });
}

playButton.addEventListener('pointerup', function(event) {
    playAudio();
});

let skipTime = 10; // Time to skip in seconds

navigator.mediaSession.setActionHandler('seekbackward', function() {
    // User clicked "Seek Backward" media notification icon.
    audio.currentTime = Math.max(audio.currentTime - skipTime, 0);
});

navigator.mediaSession.setActionHandler('seekforward', function() {
    // User clicked "Seek Forward" media notification icon.
    audio.currentTime = Math.min(audio.currentTime + skipTime, audio.duration);
});

navigator.mediaSession.setActionHandler('play', function() {
    // User clicked "Play" media notification icon.
    // Do something more than just playing current audio...
});

navigator.mediaSession.setActionHandler('pause', function() {
    // User clicked "Pause" media notification icon.
    // Do something more than just pausing current audio...
});

const FALLBACK_ARTWORK_URL = 'fallbackArtwork.png';

addEventListener('install', event => {
    self.skipWaiting();
    event.waitUntil(initArtworkCache());
});

function initArtworkCache() {
    caches.open('artwork-cache-v1')
    .then(cache => cache.add(FALLBACK_ARTWORK_URL));
}

addEventListener('fetch', event => {
    if (/artwork-[0-9]+\.png$/.test(event.request.url)) {
    event.respondWith(handleFetchArtwork(event.request));
    }
});

function handleFetchArtwork(request) {
    // Return cache request if it's in the cache already, otherwise fetch
    // network artwork.
    return getCacheArtwork(request)
    .then(cacheResponse => cacheResponse || getNetworkArtwork(request));
}

function getCacheArtwork(request) {
    return caches.open('artwork-cache-v1')
    .then(cache => cache.match(request));
}

function getNetworkArtwork(request) {
    // Fetch network artwork.
    return fetch(request)
    .then(networkResponse => {
    if (networkResponse.status !== 200) {
        return Promise.reject('Network artwork response is not valid');
    }
    // Add artwork to the cache for later use and return network response.
    addArtworkToCache(request, networkResponse.clone())
    return networkResponse;
    })
    .catch(error => {
    // Return cached fallback artwork.
    return getCacheArtwork(new Request(FALLBACK_ARTWORK_URL))
    });
}

function addArtworkToCache(request, response) {
    return caches.open('artwork-cache-v1')
    .then(cache => cache.put(request, response));
}

// Here's how I'd compute how much cache is used by artwork files...
caches.open('artwork-cache-v1')
.then(cache => cache.matchAll())
.then(responses => {
    let cacheSize = 0;
    let blobQueue = Promise.resolve();

    responses.forEach(response => {
    let responseSize = response.headers.get('content-length');
    if (responseSize) {
        // Use content-length HTTP header when possible.
        cacheSize += Number(responseSize);
    } else {
        // Otherwise, use the uncompressed blob size.
        blobQueue = blobQueue.then(_ => response.blob())
            .then(blob => { cacheSize += blob.size; blob.close(); });
    }
    });

    return blobQueue.then(_ => {
    console.log('Artwork cache is about ' + cacheSize + ' Bytes.');
    });
})
.catch(error => { console.log(error); });

// And here's how to delete some artwork files...
const artworkFilesToDelete = ['artwork1.png', 'artwork2.png', 'artwork3.png'];

caches.open('artwork-cache-v1')
.then(cache => Promise.all(artworkFilesToDelete.map(artwork => cache.delete(artwork))))
.catch(error => { console.log(error); });

<iframe id="iframe">
  <audio>...</audio>
</iframe>
<script>
  iframe.contentWindow.navigator.mediaSession.metadata = new MediaMetadata({
    title: 'Never Gonna Give You Up',
    ...
  });
</script>