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fix(VideoPlayer): work around slow Firefox MediaCapabilities.decodingInfo

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Firefox's navigator.mediaCapabilities.decodingInfo costs ~14 ms per call
(out-of-process RDD decoder probe). Shaka Player calls it once per Variant
in the DASH manifest while filtering supported variants, and YouTube
manifests routinely have 1000+ variants, so player initialization stalls
15-20 s on Gecko-based browsers before the first SourceBuffer is added.

Wrap decodingInfo to delegate "supported" checks to
MediaSource.isTypeSupported (sub-ms on Firefox) with a per-MIME cache.
DRM probes and non-media-source queries fall through to native.
Wrapper is gated to Gecko UAs so Chromium and Safari are unaffected.

Refs: https://github.com/shaka-project/shaka-player/issues/4775

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
LogicalKarma
2026-05-23 13:27:35 +03:00
committed by LogicalKarma
parent de44e80a5c
commit 6b666b4b6f
2 changed files with 50 additions and 0 deletions
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49
src/utils/firefoxMediaCapabilitiesFix.js Normal file
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/**
* Workaround for shaka-project/shaka-player#4775.
*
* Firefox's navigator.mediaCapabilities.decodingInfo() costs ~14 ms per call
* (out-of-process decoder probe). Shaka calls it once per Variant in the DASH
* manifest while filtering supported variants; YouTube manifests routinely
* have 1000+ variants, so player initialization stalls 15-20 s on Gecko-based
* browsers before any SourceBuffer is added or any segment is fetched.
*
* This module delegates the "supported" check to MediaSource.isTypeSupported
* (sub-ms on Firefox) and caches the result per MIME string. Smooth /
* powerEfficient are returned conservatively as true; Shaka's ABR will
* downshift if real playback isn't smooth.
*
* Active only on Gecko engines, so Chromium / Safari / Edge / iOS Firefox
* (WebKit) are unaffected. DRM probes (keySystemConfiguration) and non-
* media-source query types fall through to the native API unchanged.
*
* Remove this module (and its import in main.js) once Shaka ships a caching
* fix for #4775.
*/
if (
typeof navigator !== "undefined" &&
/Gecko\/[0-9]/.test(navigator.userAgent) &&
navigator.mediaCapabilities &&
typeof navigator.mediaCapabilities.decodingInfo === "function"
) {
const orig = navigator.mediaCapabilities.decodingInfo.bind(navigator.mediaCapabilities);
const cache = new Map();
const mimeOk = mime => {
if (!cache.has(mime)) cache.set(mime, MediaSource.isTypeSupported(mime));
return cache.get(mime);
};
navigator.mediaCapabilities.decodingInfo = function (config) {
if (config && config.type === "media-source" && !config.keySystemConfiguration) {
const v = config.video;
const a = config.audio;
const supported = (!v || mimeOk(v.contentType)) && (!a || mimeOk(a.contentType));
return Promise.resolve({
supported,
smooth: supported,
powerEfficient: supported,
keySystemAccess: null,
configuration: config,
});
}
return orig(config);
};
}