dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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<h1 class="page-title">Source: streaming/utils/TTMLParser.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">/**
* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
import FactoryMaker from '../../core/FactoryMaker';
import Debug from '../../core/Debug';
import EventBus from '../../core/EventBus';
import Events from '../../core/events/Events';
import {fromXML, generateISD} from 'imsc';
import MediaPlayerEvents from '../MediaPlayerEvents';
import ConformanceViolationConstants from '../constants/ConformanceViolationConstants';
function TTMLParser() {
const context = this.context;
const eventBus = EventBus(context).getInstance();
/*
* This TTML parser follows "EBU-TT-D SUBTITLING DISTRIBUTION FORMAT - tech3380" spec - https://tech.ebu.ch/docs/tech/tech3380.pdf.
* */
let instance,
logger;
let cueCounter = 0; // Used to give every cue a unique ID.
function setup() {
logger = Debug(context).getInstance().getLogger(instance);
}
function getCueID() {
const id = 'cue_TTML_' + cueCounter;
cueCounter++;
return id;
}
/**
* Parse the raw data and process it to return the HTML element representing the cue.
* Return the region to be processed and controlled (hide/show) by the caption controller.
* @param {string} data - raw data received from the TextSourceBuffer
* @param {number} offsetTime - offset time to apply to cue time
* @param {integer} startTimeSegment - startTime for the current segment
* @param {integer} endTimeSegment - endTime for the current segment
* @param {Array} images - images array referenced by subs MP4 box
*/
function parse(data, offsetTime, startTimeSegment, endTimeSegment, images) {
let errorMsg = '';
const captionArray = [];
let startTime,
endTime,
i;
const content = {};
const embeddedImages = {};
let currentImageId = '';
let accumulated_image_data = '';
let metadataHandler = {
onOpenTag: function (ns, name, attrs) {
// cope with existing non-compliant content
if (attrs[' imagetype'] && !attrs[' imageType']) {
eventBus.trigger(MediaPlayerEvents.CONFORMANCE_VIOLATION, {
level: ConformanceViolationConstants.LEVELS.ERROR,
event: ConformanceViolationConstants.EVENTS.NON_COMPLIANT_SMPTE_IMAGE_ATTRIBUTE
});
attrs[' imageType'] = attrs[' imagetype'];
}
if (name === 'image' &&
(ns === 'http://www.smpte-ra.org/schemas/2052-1/2010/smpte-tt' ||
ns === 'http://www.smpte-ra.org/schemas/2052-1/2013/smpte-tt')) {
if (!attrs[' imageType'] || attrs[' imageType'].value !== 'PNG') {
logger.warn('smpte-tt imageType != PNG. Discarded');
return;
}
currentImageId = attrs['http://www.w3.org/XML/1998/namespace id'].value;
}
},
onCloseTag: function () {
if (currentImageId) {
embeddedImages[currentImageId] = accumulated_image_data.trim();
}
accumulated_image_data = '';
currentImageId = '';
},
onText: function (contents) {
if (currentImageId) {
accumulated_image_data = accumulated_image_data + contents;
}
}
};
if (!data) {
errorMsg = 'no ttml data to parse';
throw new Error(errorMsg);
}
content.data = data;
eventBus.trigger(Events.TTML_TO_PARSE, content);
const imsc1doc = fromXML(content.data, function (msg) {
errorMsg = msg;
}, metadataHandler);
eventBus.trigger(Events.TTML_PARSED, { ttmlString: content.data, ttmlDoc: imsc1doc });
const mediaTimeEvents = imsc1doc.getMediaTimeEvents();
for (i = 0; i < mediaTimeEvents.length; i++) {
let isd = generateISD(imsc1doc, mediaTimeEvents[i], function (error) {
errorMsg = error;
});
if (isd.contents.some(topLevelContents => topLevelContents.contents.length)) {
//be sure that mediaTimeEvents values are in the mp4 segment time ranges.
startTime = (mediaTimeEvents[i] + offsetTime) < startTimeSegment ? startTimeSegment : (mediaTimeEvents[i] + offsetTime);
endTime = (mediaTimeEvents[i + 1] + offsetTime) > endTimeSegment ? endTimeSegment : (mediaTimeEvents[i + 1] + offsetTime);
if (startTime < endTime) {
captionArray.push({
start: startTime,
end: endTime,
type: 'html',
cueID: getCueID(),
isd: isd,
images: images,
embeddedImages: embeddedImages
});
}
}
}
if (errorMsg !== '') {
logger.error(errorMsg);
throw new Error(errorMsg);
}
return captionArray;
}
instance = {
parse: parse
};
setup();
return instance;
}
TTMLParser.__dashjs_factory_name = 'TTMLParser';
export default FactoryMaker.getSingletonFactory(TTMLParser);
</pre>
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