mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-20 16:57:25 +03:00
Joey Parrish
f539147d48
This fixes all the license headers in the main library, which corrects the appearance of the main license in the compiled output. It seems that the `!` in the header forces the compiler to keep it in the output. I believe older compiler releases did this purely based on `@license`. Issue #2638 Change-Id: I7f0e918caad10c9af689c9d07672b7fe9be7b2f3
93 lines
2.5 KiB
JavaScript
93 lines
2.5 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.polyfill.VTTCue');
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goog.require('shaka.log');
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goog.require('shaka.polyfill');
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/**
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* @summary A polyfill to provide VTTCue.
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*/
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shaka.polyfill.VTTCue = class {
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/**
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* Install the polyfill if needed.
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*/
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static install() {
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if (window.VTTCue) {
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shaka.log.info('Using native VTTCue.');
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return;
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}
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if (!window.TextTrackCue) {
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shaka.log.error('VTTCue not available.');
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return;
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}
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const constructorLength = TextTrackCue.length;
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if (constructorLength == 3) {
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shaka.log.info('Using VTTCue polyfill from 3 argument TextTrackCue.');
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window['VTTCue'] = shaka.polyfill.VTTCue.from3ArgsTextTrackCue_;
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} else if (constructorLength == 6) {
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shaka.log.info('Using VTTCue polyfill from 6 argument TextTrackCue.');
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window['VTTCue'] = shaka.polyfill.VTTCue.from6ArgsTextTrackCue_;
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} else if (shaka.polyfill.VTTCue.canUse3ArgsTextTrackCue_()) {
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shaka.log.info('Using VTTCue polyfill from 3 argument TextTrackCue.');
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window['VTTCue'] = shaka.polyfill.VTTCue.from3ArgsTextTrackCue_;
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}
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}
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/**
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* Draft spec TextTrackCue with 3 constructor arguments.
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* @see {@link https://bit.ly/2IdyKbA W3C Working Draft 25 October 2012}.
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*
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* @param {number} startTime
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* @param {number} endTime
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* @param {string} text
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* @return {!TextTrackCue}
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* @private
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*/
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static from3ArgsTextTrackCue_(startTime, endTime, text) {
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return new window.TextTrackCue(startTime, endTime, text);
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}
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/**
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* Draft spec TextTrackCue with 6 constructor arguments (5th & 6th are
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* optional).
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* @see {@link https://bit.ly/2KaGSP2 W3C Working Draft 29 March 2012}.
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*
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* @param {number} startTime
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* @param {number} endTime
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* @param {string} text
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* @return {!TextTrackCue}
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* @private
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*/
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static from6ArgsTextTrackCue_(startTime, endTime, text) {
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const id = startTime + '-' + endTime + '-' + text;
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// Quoting the access to the TextTrackCue object to satisfy the compiler.
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return new window['TextTrackCue'](id, startTime, endTime, text);
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}
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/**
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* IE10, IE11 and Edge return TextTrackCue.length = 0, although they accept 3
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* constructor arguments.
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*
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* @return {boolean}
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* @private
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*/
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static canUse3ArgsTextTrackCue_() {
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try {
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return !!shaka.polyfill.VTTCue.from3ArgsTextTrackCue_(1, 2, '');
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} catch (error) {
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return false;
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}
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}
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};
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shaka.polyfill.register(shaka.polyfill.VTTCue.install);
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