6dac1028a3
A favorite outlives its thumbnail. Sources sign their CDN paths and the signature expires, so a video kept months ago has a `thumb` that 404s and a card that is a grey box with a title under it. Asking the source page for a fresh picture covers the case where the page still exists; nothing covered the case where it doesn't. The video does, because playback re-resolves from the page URL every time. So once every route to the listed picture is exhausted, a frame a quarter of the way in becomes the card's picture -- past the black lead-in, and a fair guess at what the video looks like. It goes through our own proxy, so the canvas can be read back, is scaled to card width and JPEG'd to a handful of KB, and is kept: later mounts and later sessions paint it without a request, instead of asking again for a picture that is known to be gone. Only for favorites, once per item, one at a time, and never for a live stream or a manifest. Two things worth knowing, both found with the browser rather than reasoned about: a browser fires `seeked` for its own initial seek to zero, so taking the frame on the first one captures the opening of every video; and the same item is on screen in more than one place, so the captures are deduped by a promise rather than the first asker getting the picture and the rest being told there isn't one. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MPZFnNdHbPGDTqQUNiE4ZN
54 lines
1.8 KiB
JavaScript
54 lines
1.8 KiB
JavaScript
window.App = window.App || {};
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// Centralized runtime state for pagination, player, and UI behavior.
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App.state = {
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currentPage: 1,
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perPage: 12,
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renderedVideoIds: new Set(),
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hasNextPage: true,
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isLoading: false,
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hlsPlayer: null,
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currentLoadController: null,
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errorToastTimer: null,
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loadedVideos: [],
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feedOpen: false,
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feedMuted: true,
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feedActiveIndex: -1,
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feedActiveVideoId: null,
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groupCursors: null
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};
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// Local storage keys used across modules.
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App.constants = {
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FAVORITES_KEY: 'favorites',
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FAVORITES_VISIBILITY_KEY: 'favoritesVisible',
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FAVORITES_SORT_KEY: 'favoritesSort',
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PREFERRED_QUALITY_KEY: 'preferredQuality',
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FEED_END_BEHAVIOR_KEY: 'feedEndBehavior',
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SEARCH_HISTORY_KEY: 'searchHistory',
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SAVED_SEARCHES_KEY: 'savedSearches',
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// Thumbnails captured out of a video whose listed picture is gone:
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// the index, plus one entry per picture under `<key>:<hash>`.
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POSTER_CACHE_KEY: 'posterCache'
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};
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// Lazily injects hls.js the first time a stream actually needs it. Sessions
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// that only browse thumbnails, or that play native/MP4, never download it.
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// Resolves with window.Hls (or null if loading failed).
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App.ensureHls = function() {
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if (window.Hls) return Promise.resolve(window.Hls);
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if (App._hlsPromise) return App._hlsPromise;
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App._hlsPromise = new Promise((resolve, reject) => {
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const script = document.createElement('script');
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script.src = 'https://cdn.jsdelivr.net/npm/hls.js@1.5';
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script.async = true;
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script.onload = () => resolve(window.Hls || null);
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script.onerror = () => {
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App._hlsPromise = null;
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reject(new Error('Failed to load hls.js'));
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};
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document.head.appendChild(script);
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});
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return App._hlsPromise;
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};
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