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This adds a VTTCue polyfill for IE/Edge (3-arg TextTrackCue) and Toshiba dTV (6-arg TextTrackCue). Closes #635
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/** | ||
* @license | ||
* Copyright 2016 Google Inc. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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goog.provide('shaka.polyfill.VTTCue'); | ||
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goog.require('shaka.log'); | ||
goog.require('shaka.polyfill.register'); | ||
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/** | ||
* @namespace shaka.polyfill.VTTCue | ||
* | ||
* @summary A polyfill to provide VTTCue. | ||
*/ | ||
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/** | ||
* Install the polyfill if needed. | ||
*/ | ||
shaka.polyfill.VTTCue.install = function() { | ||
if (window.VTTCue) { | ||
shaka.log.info('Using native VTTCue.'); | ||
return; | ||
} | ||
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if (!window.TextTrackCue) { | ||
shaka.log.error('VTTCue not available.'); | ||
return; | ||
} | ||
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var constructorLength = TextTrackCue.length; | ||
if (constructorLength == 3) { | ||
shaka.log.info('Using VTTCue polyfill from 3 argument TextTrackCue.'); | ||
window.VTTCue = shaka.polyfill.VTTCue.from3ArgsTextTrackCue_; | ||
} else if (constructorLength == 6) { | ||
shaka.log.info('Using VTTCue polyfill from 6 argument TextTrackCue.'); | ||
window.VTTCue = shaka.polyfill.VTTCue.from6ArgsTextTrackCue_; | ||
} else if (shaka.polyfill.VTTCue.canUse3ArgsTextTrackCue_()) { | ||
shaka.log.info('Using VTTCue polyfill from 3 argument TextTrackCue.'); | ||
window.VTTCue = shaka.polyfill.VTTCue.from3ArgsTextTrackCue_; | ||
} | ||
}; | ||
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/** | ||
* Draft spec TextTrackCue with 3 constructor arguments. | ||
* See {@link https://goo.gl/ZXBWZi W3C Working Draft 25 October 2012}. | ||
* | ||
* @param {number} startTime | ||
* @param {number} endTime | ||
* @param {string} text | ||
* @return {TextTrackCue} | ||
* @private | ||
*/ | ||
shaka.polyfill.VTTCue.from3ArgsTextTrackCue_ = function(startTime, endTime, | ||
text) { | ||
return new window.TextTrackCue(startTime, endTime, text); | ||
}; | ||
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/** | ||
* Draft spec TextTrackCue with 6 constructor arguments (5th & 6th are | ||
* optional). | ||
* See {@link https://goo.gl/AYFqUh W3C Working Draft 29 March 2012}. | ||
* Quoting the access to the TextTrackCue object to avoid the compiler | ||
* complaining. | ||
* | ||
* @param {number} startTime | ||
* @param {number} endTime | ||
* @param {string} text | ||
* @return {TextTrackCue} | ||
* @private | ||
*/ | ||
shaka.polyfill.VTTCue.from6ArgsTextTrackCue_ = function(startTime, endTime, | ||
text) { | ||
var id = startTime + '-' + endTime + '-' + text; | ||
return new window['TextTrackCue'](id, startTime, endTime, text); | ||
}; | ||
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/** | ||
* IE10, IE11 and Edge returns TextTrackCue.length = 0 although it accepts 3 | ||
* constructor arguments. | ||
* | ||
* @return {boolean} | ||
* @private | ||
*/ | ||
shaka.polyfill.VTTCue.canUse3ArgsTextTrackCue_ = function() { | ||
try { | ||
return !!shaka.polyfill.VTTCue.from3ArgsTextTrackCue_(1, 2, ''); | ||
} catch (error) { | ||
return false; | ||
} | ||
}; | ||
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shaka.polyfill.register(shaka.polyfill.VTTCue.install); |
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