mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Andy(김규회)
05b09728c7
Added polyfills for `Map.getOrInsert()` and `Map.getOrInsertComputed()` from the TC39 upsert proposal and refactor the codebase to use them. These methods replace the common "check if key exists, then set default" pattern with a single atomic operation. This improves code readability and eliminates redundant map lookups throughout the player. --------- Co-authored-by: Álvaro Velad Galván <ladvan91@hotmail.com>
54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
/*! @license
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* Shaka Player
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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goog.provide('shaka.media.Capabilities');
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/**
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* @summary
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* This is for capturing all media source capabilities on current platform.
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* And this is for static check and can not be constructed.
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*/
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shaka.media.Capabilities = class {
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/**
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* Cache browser engine call to improve performance on some poor platforms
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*
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* @param {string} type
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* @return {boolean}
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*/
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static isTypeSupported(type) {
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const supportMap = shaka.media.Capabilities.MediaSourceTypeSupportMap;
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return supportMap.getOrInsertComputed(type, () => {
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const mediaSource = window.ManagedMediaSource || window.MediaSource;
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return mediaSource?.isTypeSupported(type) ?? false;
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});
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}
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/**
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* Determine support for MediaSource.setLiveSeekableRange and
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* MediaSource.clearLiveSeekableRange, which can allow for a media element
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* duration of Infinite by providing a non-infinite seekable range.
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*
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* @return {boolean}
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*/
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static isInfiniteLiveStreamDurationSupported() {
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const mediaSource = window.ManagedMediaSource || window.MediaSource;
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// eslint-disable-next-line no-restricted-syntax
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if (mediaSource && mediaSource.prototype) {
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// eslint-disable-next-line no-restricted-syntax
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return !!mediaSource.prototype.setLiveSeekableRange &&
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// eslint-disable-next-line no-restricted-syntax
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!!mediaSource.prototype.clearLiveSeekableRange;
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}
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return false;
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}
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};
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/**
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* Public it for unit test, and developer could also check the support map.
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* @type {!Map<string, boolean>}
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*/
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shaka.media.Capabilities.MediaSourceTypeSupportMap = new Map();
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