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3b7b40b39e
Add the upstream Mozilla tracker bug for the slow decodingInfo path. Refs: https://bugzilla.mozilla.org/show_bug.cgi?id=2043895 https://github.com/TeamPiped/Piped/issues/4238
57 lines
2.5 KiB
JavaScript
57 lines
2.5 KiB
JavaScript
/**
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* HACK: Firefox-only fast path for navigator.mediaCapabilities.decodingInfo().
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*
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* Rough comparison: Chromium ~0.1 ms/call vs Firefox ~20 ms/call.
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* Shaka calls decodingInfo once per Variant while filtering the manifest, so on
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* a YouTube-shape manifest with many Variants Firefox stalls several seconds at
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* player init before any SourceBuffer is added.
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*
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* This module delegates "supported" to MediaSource.isTypeSupported (sub-ms on
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* Firefox) and synthesizes smooth = powerEfficient = supported.
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*
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* KNOWN DOWNSIDE: by forcing smooth and powerEfficient to true we discard the
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* native signals Shaka would otherwise see. If anything in the player chain
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* reads those fields (e.g. preferredDecodingAttributes is set, a downstream
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* consumer ranks variants on power efficiency, or a Shaka upgrade changes
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* filtering), this shim will cause Shaka to pick streams the device cannot
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* decode in real time — frame drops, software-decode CPU spikes, battery
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* drain. Today (Shaka 5.1, Piped default config) those fields are not read
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* and the shim is harmless; revisit on every Shaka upgrade.
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*
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* Active only on Gecko engines, so Chromium / Safari / Edge / iOS Firefox
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* (WebKit) are unaffected. DRM probes (keySystemConfiguration) and non-
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* media-source query types fall through to the native API unchanged.
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*
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* Refs:
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* https://bugzilla.mozilla.org/show_bug.cgi?id=2043895
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* https://github.com/TeamPiped/Piped/issues/4238
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*/
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if (
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typeof navigator !== "undefined" &&
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/Gecko\/[0-9]/.test(navigator.userAgent) &&
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navigator.mediaCapabilities &&
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typeof navigator.mediaCapabilities.decodingInfo === "function"
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) {
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const orig = navigator.mediaCapabilities.decodingInfo.bind(navigator.mediaCapabilities);
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const cache = new Map();
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const mimeOk = mime => {
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if (!cache.has(mime)) cache.set(mime, MediaSource.isTypeSupported(mime));
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return cache.get(mime);
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};
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navigator.mediaCapabilities.decodingInfo = function (config) {
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if (config && config.type === "media-source" && !config.keySystemConfiguration) {
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const v = config.video;
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const a = config.audio;
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const supported = (!v || mimeOk(v.contentType)) && (!a || mimeOk(a.contentType));
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return Promise.resolve({
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supported,
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smooth: supported,
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powerEfficient: supported,
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keySystemAccess: null,
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configuration: config,
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});
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}
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return orig(config);
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};
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}
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