Медиа и трансляция

Copyvar audio = document.getElementById('player');
var tracks = [
  { src: 'https://example.com/a.mp3', title: 'Morning', artist: 'Band', art: 'https://example.com/a.jpg' },
  { src: 'https://example.com/b.mp3', title: 'Evening', artist: 'Band', art: 'https://example.com/b.jpg' }
];
var index = 0;
var handlersReady = false;

function setupHandlers() {
  if (handlersReady || !('mediaSession' in navigator)) return;
  handlersReady = true;
  var ms = navigator.mediaSession;
  ms.setActionHandler('play', function () { audio.play(); });
  ms.setActionHandler('pause', function () { audio.pause(); });
  ms.setActionHandler('nexttrack', function () { playTrack(index + 1); });
  ms.setActionHandler('previoustrack', function () { playTrack(index - 1); });
  ms.setActionHandler('stop', function () { audio.pause(); audio.currentTime = 0; });
}

function playTrack(i) {
  index = (i + tracks.length) % tracks.length;
  var t = tracks[index];
  audio.src = t.src;
  audio.play();
  setupHandlers();   // on the first play, not at page load (see Notes)
  if ('mediaSession' in navigator && window.MediaMetadata) {
    navigator.mediaSession.metadata = new MediaMetadata({
      title: t.title, artist: t.artist, album: '',
      artwork: [{ src: t.art, sizes: '512x512', type: 'image/jpeg' }]
    });
  }
}

document.getElementById('play-btn').addEventListener('click', function () { playTrack(0); });

Copyfunction publishState() {
  if (!('mediaSession' in navigator)) return;
  navigator.mediaSession.playbackState = audio.paused ? 'paused' : 'playing';   // set this FIRST
  if (audio.duration > 0 && navigator.mediaSession.setPositionState) {
    navigator.mediaSession.setPositionState({
      duration: audio.duration, position: audio.currentTime, playbackRate: 1
    });
  }
}
audio.addEventListener('play', publishState);
audio.addEventListener('pause', publishState);
audio.addEventListener('seeked', publishState);

Copyvar audio = document.getElementById('player');
function skip(seconds) {
  var end = audio.duration || 0;
  audio.currentTime = Math.max(0, Math.min(end, audio.currentTime + seconds));
  if ('mediaSession' in navigator && navigator.mediaSession.setPositionState && end > 0) {
    navigator.mediaSession.setPositionState({ duration: end, position: audio.currentTime });
  }
}
if ('mediaSession' in navigator) {
  navigator.mediaSession.setActionHandler('play', function () { audio.play(); });
  navigator.mediaSession.setActionHandler('pause', function () { audio.pause(); });
  navigator.mediaSession.setActionHandler('nexttrack', function () { skip(30); });
  navigator.mediaSession.setActionHandler('previoustrack', function () { skip(-15); });
  if (window.MediaMetadata) {
    navigator.mediaSession.metadata = new MediaMetadata({
      title: 'Episode 12: Getting started', artist: 'My Podcast',
      artwork: [{ src: 'https://example.com/podcast-512.jpg', sizes: '512x512' }]
    });
  }
}

Copy<video id="v" src="clip.mp4" controls playsinline></video>
<button id="pip">Pop out</button>
<script>
const v = document.getElementById('v');
const btn = document.getElementById('pip');
btn.hidden = !document.pictureInPictureEnabled;
btn.addEventListener('click', async () => {
  try {
    if (document.pictureInPictureElement) await document.exitPictureInPicture();
    else await v.requestPictureInPicture();
  } catch (e) {
    console.warn('Picture-in-Picture:', e.name);
  }
});
v.addEventListener('enterpictureinpicture', () => { btn.textContent = 'Back to app'; });
v.addEventListener('leavepictureinpicture', () => { btn.textContent = 'Pop out'; });
</script>

Copyconst v = document.getElementById('v');
if (!document.pictureInPictureEnabled || v.disablePictureInPicture) {
  document.getElementById('pip').hidden = true;      // this build has no picture-in-picture
}
document.addEventListener('visibilitychange', async () => {
  if (document.hidden && !v.paused && !document.pictureInPictureElement) {
    try { await v.requestPictureInPicture(); }
    catch (e) { console.warn(e.name); }               // NotAllowedError without a tap
  }
});

Copyasync function popOut(video) {
  if (video.readyState < 1) await new Promise((r) => video.addEventListener('loadedmetadata', r, { once: true }));
  try {
    const pipWin = await video.requestPictureInPicture();
    pipWin.addEventListener('resize', () => console.log(pipWin.width, pipWin.height));
  } catch (e) {
    if (e.name === 'InvalidStateError') showMessage('This video cannot float.');
    else if (e.name === 'NotAllowedError') showMessage('Tap the button to pop out.');
  }
}
document.getElementById('pip').onclick = () => popOut(document.getElementById('v'));

Copyconst video = document.querySelector('video');
button.addEventListener('click', () => video.requestPictureInPicture());

Copyasync function floatVideo(video) {
  if (!document.pictureInPictureEnabled) { showMessage('Picture-in-picture is not on in this app.'); return; }
  try {
    await video.requestPictureInPicture();
  } catch (err) {
    showMessage('Could not open the floating window.');
  }
}

Copyvideo.addEventListener('enterpictureinpicture', () => hideControls());
video.addEventListener('leavepictureinpicture', () => showControls());
closeBtn.onclick = () => { if (document.pictureInPictureElement) document.exitPictureInPicture(); };

Copyconst video = document.querySelector('video');
button.addEventListener('click', () => video.requestPictureInPicture());

Copyasync function floatVideo(video) {
  if (!document.pictureInPictureEnabled) { showMessage('Picture-in-picture is not on in this app.'); return; }
  try {
    await video.requestPictureInPicture();
  } catch (err) {
    showMessage('Could not open the floating window.');
  }
}

Copyvideo.addEventListener('enterpictureinpicture', () => hideControls());
video.addEventListener('leavepictureinpicture', () => showControls());
closeBtn.onclick = () => { if (document.pictureInPictureElement) document.exitPictureInPicture(); };

Copyconst video = document.querySelector('video');
button.addEventListener('click', () => video.requestPictureInPicture());

Copyasync function floatVideo(video) {
  if (!document.pictureInPictureEnabled) { showMessage('Picture-in-picture is not on in this app.'); return; }
  try {
    await video.requestPictureInPicture();
  } catch (err) {
    showMessage('Could not open the floating window.');
  }
}

Copyvideo.addEventListener('enterpictureinpicture', () => hideControls());
video.addEventListener('leavepictureinpicture', () => showControls());
closeBtn.onclick = () => { if (document.pictureInPictureElement) document.exitPictureInPicture(); };

Copyconst video = document.querySelector('video');
button.addEventListener('click', () => video.requestPictureInPicture());

Copyasync function floatVideo(video) {
  if (!document.pictureInPictureEnabled) { showMessage('Picture-in-picture is not on in this app.'); return; }
  try {
    await video.requestPictureInPicture();
  } catch (err) {
    showMessage('Could not open the floating window.');
  }
}

Copyvideo.addEventListener('enterpictureinpicture', () => hideControls());
video.addEventListener('leavepictureinpicture', () => showControls());
closeBtn.onclick = () => { if (document.pictureInPictureElement) document.exitPictureInPicture(); };

Copyfunction castToTv(url) {
  if (window.WebToApk && typeof window.WebToApk.castMedia === 'function') {
    window.WebToApk.castMedia(url);          // opens the "Cast to..." chooser
  } else {
    alert('Casting is only available in the app');
  }
}

document.getElementById('cast-btn').addEventListener('click', function () {
  var video = document.querySelector('video');
  var url = video && video.currentSrc ? video.currentSrc : 'https://example.com/movie.mp4';
  castToTv(url);
});

Copy// <li><button class="cast" data-src="https://example.com/ep12.mp3">Cast</button> Episode 12</li>
document.getElementById('episodes').addEventListener('click', function (e) {
  var btn = e.target.closest('button.cast');
  if (!btn) return;
  var src = btn.getAttribute('data-src') || '';
  if (src.indexOf('https://') !== 0) {
    alert('This episode cannot be cast');   // files inside the app cannot be handed over
    return;
  }
  if (window.WebToApk && typeof window.WebToApk.castMedia === 'function') {
    window.WebToApk.castMedia(src);
  }
});

Copyvar castBtn = document.getElementById('cast-live');
var canCast = !!(window.WebToApk && typeof window.WebToApk.castMedia === 'function');
castBtn.hidden = !canCast;

castBtn.addEventListener('click', function () {
  var video = document.getElementById('live');
  video.pause();                                   // avoid playing twice, here and on the TV
  window.WebToApk.castMedia('https://example.com/live/stream.m3u8');   // offered to video apps
});

Copyfunction closePlayer() {
  var audio = document.getElementById('player');
  audio.pause();
  audio.currentTime = 0;
  if (window.WebToApk && typeof window.WebToApk.clearMediaNotification === 'function') {
    window.WebToApk.clearMediaNotification();
  }
}

document.getElementById('close-player').addEventListener('click', closePlayer);

// The notification's own Stop button already removes it; just stop your audio:
if ('mediaSession' in navigator) {
  navigator.mediaSession.setActionHandler('stop', function () {
    var audio = document.getElementById('player');
    audio.pause();
    audio.currentTime = 0;
  });
}

Copyvar sleepTimer = null;
function setSleepTimer(minutes) {
  clearTimeout(sleepTimer);
  sleepTimer = setTimeout(function () {
    var audio = document.getElementById('player');
    audio.pause();
    if (window.WebToApk && typeof window.WebToApk.clearMediaNotification === 'function') {
      window.WebToApk.clearMediaNotification();
    }
  }, minutes * 60 * 1000);
}
document.getElementById('sleep-30').addEventListener('click', function () { setSleepTimer(30); });

Copyvar audio = document.getElementById('player');
var playlist = ['https://example.com/1.mp3', 'https://example.com/2.mp3'];
var current = 0;

audio.addEventListener('ended', function () {
  current++;
  if (current < playlist.length) {
    audio.src = playlist[current];
    audio.play();
  } else if (window.WebToApk && typeof window.WebToApk.clearMediaNotification === 'function') {
    window.WebToApk.clearMediaNotification();
  }
});

Copyif ('mediaSession' in navigator && window.MediaMetadata) {
  navigator.mediaSession.metadata = new MediaMetadata({
    title: 'Episode 12', artist: 'My Podcast',
    artwork: [{ src: 'https://example.com/cover.jpg', sizes: '512x512' }]
  });
}

Copyfunction showNowPlaying(track) {
  if (!(window.WebToApk && typeof window.WebToApk.setMediaMetadata === 'function')) return;
  window.WebToApk.setMediaMetadata(track.title, track.artist || '', track.cover || '');
  window.WebToApk.setPlaybackState(true, 0, Math.round(track.seconds * 1000));
}

// Buttons in the notification come back through the standard API:
if ('mediaSession' in navigator) {
  navigator.mediaSession.setActionHandler('nexttrack', function () { playNext(); });
  navigator.mediaSession.setActionHandler('previoustrack', function () { playPrevious(); });
}

Copyvar lastSong = '';
function refreshNowPlaying() {
  fetch('https://example.com/radio/now-playing.json')
    .then(function (r) { return r.json(); })
    .then(function (np) {            // e.g. { "title": "...", "artist": "...", "cover": "https://..." }
      var key = np.title + '|' + np.artist;
      if (key === lastSong) return;  // only update when the song really changed
      lastSong = key;
      if (window.WebToApk && typeof window.WebToApk.setMediaMetadata === 'function') {
        window.WebToApk.setMediaMetadata(np.title || 'Live radio', np.artist || '', np.cover || '');
      }
    })
    .catch(function () { /* try again on the next tick */ });
}
document.getElementById('radio').addEventListener('play', function () {
  refreshNowPlaying();
  setInterval(refreshNowPlaying, 30000);
}, { once: true });

Copyvar audio = document.getElementById('player');
function publish() {
  if (!('mediaSession' in navigator)) return;
  navigator.mediaSession.playbackState = audio.paused ? 'paused' : 'playing';
  if (audio.duration > 0 && navigator.mediaSession.setPositionState) {
    navigator.mediaSession.setPositionState({ duration: audio.duration, position: audio.currentTime });
  }
}
audio.addEventListener('play', publish);
audio.addEventListener('pause', publish);

Copyfunction publishRaw(audio) {
  if (!(window.WebToApk && typeof window.WebToApk.setPlaybackState === 'function')) return;
  window.WebToApk.setPlaybackState(
    !audio.paused,
    Math.floor(audio.currentTime * 1000),
    Math.floor((audio.duration || 0) * 1000)
  );
}

Copyvar audio = document.getElementById('player');
function report(playing) {
  if (!(window.WebToApk && typeof window.WebToApk.setPlaybackState === 'function')) return;
  var durMs = Math.floor((audio.duration || 0) * 1000);
  var posMs = Math.floor(audio.currentTime * 1000);
  window.WebToApk.setPlaybackState(playing, Math.min(posMs, durMs || posMs), durMs);
}
audio.addEventListener('seeked', function () { report(!audio.paused); });
audio.addEventListener('ended', function () { report(false); });   // Play button, notification can be swiped away