dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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<html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="https://dashif.org/img/favicon.ico"><link type="text/css" rel="stylesheet" href="jsdoc-custom.css"><title>Source: streaming/models/FragmentModel.js</title><!--[if lt IE 9]>
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href="MediaPlayerEvents.html#event:BUFFER_LEVEL_UPDATED">BUFFER_LEVEL_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:BUFFER_LOADED">BUFFER_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAN_PLAY">CAN_PLAY</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAN_PLAY_THROUGH">CAN_PLAY_THROUGH</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAPTION_CONTAINER_RESIZE">CAPTION_CONTAINER_RESIZE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAPTION_RENDERED">CAPTION_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CONFORMANCE_VIOLATION">CONFORMANCE_VIOLATION</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CONTENT_STEERING_REQUEST_COMPLETED">CONTENT_STEERING_REQUEST_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CUE_ENTER">CUE_ENTER</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CUE_ENTER">CUE_ENTER</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_ADDED">DVB_FONT_DOWNLOAD_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_COMPLETE">DVB_FONT_DOWNLOAD_COMPLETE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_FAILED">DVB_FONT_DOWNLOAD_FAILED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DYNAMIC_TO_STATIC">DYNAMIC_TO_STATIC</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:ERROR">ERROR</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:EVENT_MODE_ON_RECEIVE">EVENT_MODE_ON_RECEIVE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:EVENT_MODE_ON_START">EVENT_MODE_ON_START</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_ABANDONED">FRAGMENT_LOADING_ABANDONED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_COMPLETED">FRAGMENT_LOADING_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_PROGRESS">FRAGMENT_LOADING_PROGRESS</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_STARTED">FRAGMENT_LOADING_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:INBAND_PRFT">INBAND_PRFT</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:LOG">LOG</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADED">MANIFEST_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_FINISHED">MANIFEST_LOADING_FINISHED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_STARTED">MANIFEST_LOADING_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_VALIDITY_CHANGED">MANIFEST_VALIDITY_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_ADDED">METRIC_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_CHANGED">METRIC_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_UPDATED">METRIC_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRICS_CHANGED">METRICS_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_COMPLETED">PERIOD_SWITCH_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_STARTED">PERIOD_SWITCH_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ENDED">PLAYBACK_ENDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ERROR">PLAYBACK_ERROR</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_LOADED_DATA">PLAYBACK_LOADED_DATA</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_METADATA_LOADED">PLAYBACK_METADATA_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_NOT_ALLOWED">PLAYBACK_NOT_ALLOWED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PAUSED">PLAYBACK_PAUSED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PLAYING">PLAYBACK_PLAYING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PROGRESS">PLAYBACK_PROGRESS</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_RATE_CHANGED">PLAYBACK_RATE_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_SEEKED">PLAYBACK_SEEKED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_SEEKING">PLAYBACK_SEEKING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_STALLED">PLAYBACK_STALLED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_STARTED">PLAYBACK_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_TIME_UPDATED">PLAYBACK_TIME_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_VOLUME_CHANGED">PLAYBACK_VOLUME_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_WAITING">PLAYBACK_WAITING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_RENDERED">QUALITY_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_REQUESTED">QUALITY_CHANGE_REQUESTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:REPRESENTATION_SWITCH">REPRESENTATION_SWITCH</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_ACTIVATED">STREAM_ACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_DEACTIVATED">STREAM_DEACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZED">STREAM_INITIALIZED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZING">STREAM_INITIALIZING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_TEARDOWN_COMPLETE">STREAM_TEARDOWN_COMPLETE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_UPDATED">STREAM_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACK_ADDED">TEXT_TRACK_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACKS_ADDED">TEXT_TRACKS_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:THROUGHPUT_MEASUREMENT_STORED">THROUGHPUT_MEASUREMENT_STORED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TRACK_CHANGE_RENDERED">TRACK_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_PARSED">TTML_PARSED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_TO_PARSE">TTML_TO_PARSE</a></div><div class="sidebar-section-children"><a href="MetricsReportingEvents.html#event:CMCD_DATA_GENERATED">CMCD_DATA_GENERATED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_FINISHED">OFFLINE_RECORD_FINISHED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_LOADEDMETADATA">OFFLINE_RECORD_LOADEDMETADATA</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STARTED">OFFLINE_RECORD_STARTED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STOPPED">OFFLINE_RECORD_STOPPED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_ADDED">KEY_ADDED</a></div><div 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class="has-anchor">streaming_models_FragmentModel.js</h1></header><article><pre class="prettyprint source lang-js"><code>/**
* 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 FragmentRequest from '../vo/FragmentRequest';
const FRAGMENT_MODEL_LOADING = 'loading';
const FRAGMENT_MODEL_EXECUTED = 'executed';
const FRAGMENT_MODEL_CANCELED = 'canceled';
const FRAGMENT_MODEL_FAILED = 'failed';
function FragmentModel(config) {
config = config || {};
const eventBus = config.eventBus;
const events = config.events;
const dashMetrics = config.dashMetrics;
const fragmentLoader = config.fragmentLoader;
const debug = config.debug;
const streamInfo = config.streamInfo;
const type = config.type;
let instance,
logger,
executedRequests,
loadingRequests;
function setup() {
logger = debug.getLogger(instance);
resetInitialSettings();
eventBus.on(events.LOADING_COMPLETED, onLoadingCompleted, instance);
eventBus.on(events.LOADING_DATA_PROGRESS, onLoadingInProgress, instance);
eventBus.on(events.LOADING_ABANDONED, onLoadingAborted, instance);
}
function getStreamId() {
return streamInfo.id;
}
function getType() {
return type;
}
function isFragmentLoaded(request) {
const isEqualComplete = function (req1, req2) {
return ((req1.action === FragmentRequest.ACTION_COMPLETE) && (req1.action === req2.action));
};
const isEqualMedia = function (req1, req2) {
return !isNaN(req1.index) && (req1.startTime === req2.startTime) && (req1.adaptationIndex === req2.adaptationIndex) && (req1.type === req2.type);
};
const isEqualInit = function (req1, req2) {
return isNaN(req1.index) && isNaN(req2.index) && (req1.quality === req2.quality);
};
const check = function (requests) {
let isLoaded = false;
requests.some(req => {
if (isEqualMedia(request, req) || isEqualInit(request, req) || isEqualComplete(request, req)) {
isLoaded = true;
return isLoaded;
}
});
return isLoaded;
};
if (!request) {
return false;
}
return check(executedRequests);
}
function isFragmentLoadedOrPending(request) {
let isLoaded = false;
let i = 0;
let req;
// First, check if the fragment has already been loaded
isLoaded = isFragmentLoaded(request);
// Then, check if the fragment is about to be loeaded
if (!isLoaded) {
for (i = 0; i < loadingRequests.length; i++) {
req = loadingRequests[i];
if ((request.url === req.url) && (request.startTime === req.startTime)) {
isLoaded = true;
}
}
}
return isLoaded;
}
/**
*
* Gets an array of {@link FragmentRequest} objects
*
* @param {Object} filter The object with properties by which the method filters the requests to be returned.
* the only mandatory property is state, which must be a value from
* other properties should match the properties of {@link FragmentRequest}. E.g.:
* getRequests({state: FragmentModel.FRAGMENT_MODEL_EXECUTED, quality: 0}) - returns
* all the requests from executedRequests array where requests.quality = filter.quality
*
* @returns {Array}
* @memberof FragmentModel#
*/
function getRequests(filter) {
const states = filter ? filter.state instanceof Array ? filter.state : [filter.state] : [];
let filteredRequests = [];
states.forEach(state => {
const requests = getRequestsForState(state);
filteredRequests = filteredRequests.concat(filterRequests(requests, filter));
});
return filteredRequests;
}
function getRequestThreshold(req) {
return isNaN(req.duration) ? 0.25 : Math.min(req.duration / 8, 0.5);
}
function removeExecutedRequestsBeforeTime(time) {
executedRequests = executedRequests.filter(req => {
const threshold = getRequestThreshold(req);
return isNaN(req.startTime) || (time !== undefined ? req.startTime >= time - threshold : false);
});
}
function removeExecutedRequestsAfterTime(time) {
executedRequests = executedRequests.filter(req => {
return isNaN(req.startTime) || (time !== undefined ? req.startTime < time : false);
});
}
function removeExecutedRequestsInTimeRange(start, end) {
if (end <= start + 0.5) {
return;
}
executedRequests = executedRequests.filter(req => {
const threshold = getRequestThreshold(req);
return (isNaN(req.startTime) || req.startTime >= (end - threshold)) ||
(isNaN(req.duration) || (req.startTime + req.duration) <= (start + threshold));
});
}
// Remove requests that are not "represented" by any of buffered ranges
function syncExecutedRequestsWithBufferedRange(bufferedRanges, streamDuration) {
if (!bufferedRanges || bufferedRanges.length === 0) {
removeExecutedRequestsBeforeTime();
return;
}
let start = 0;
for (let i = 0, ln = bufferedRanges.length; i < ln; i++) {
removeExecutedRequestsInTimeRange(start, bufferedRanges.start(i));
start = bufferedRanges.end(i);
}
if (streamDuration > 0) {
removeExecutedRequestsInTimeRange(start, streamDuration);
}
}
function abortRequests() {
logger.debug('abort requests');
fragmentLoader.abort();
loadingRequests = [];
}
function executeRequest(request) {
switch (request.action) {
case FragmentRequest.ACTION_DOWNLOAD:
addSchedulingInfoMetrics(request, FRAGMENT_MODEL_LOADING);
loadingRequests.push(request);
loadCurrentFragment(request);
break;
default:
logger.warn('Unknown request action.');
}
}
function loadCurrentFragment(request) {
eventBus.trigger(events.FRAGMENT_LOADING_STARTED,
{ request: request },
{ streamId: streamInfo.id, mediaType: type }
);
fragmentLoader.load(request);
}
function getRequestForTime(arr, time, threshold) {
// loop through the executed requests and pick the one for which the playback interval matches the given time
const lastIdx = arr.length - 1;
for (let i = lastIdx; i >= 0; i--) {
const req = arr[i];
const start = req.startTime;
const end = start + req.duration;
threshold = !isNaN(threshold) ? threshold : getRequestThreshold(req);
if ((!isNaN(start) && !isNaN(end) && ((time + threshold) >= start) && ((time - threshold) < end)) || (isNaN(start) && isNaN(time))) {
return req;
}
}
return null;
}
function filterRequests(arr, filter) {
// for time use a specific filtration function
if (filter.hasOwnProperty('time')) {
return [getRequestForTime(arr, filter.time, filter.threshold)];
}
return arr.filter(request => {
for (const prop in filter) {
if (prop === 'state') continue;
if (filter.hasOwnProperty(prop) && request[prop] != filter[prop]) return false;
}
return true;
});
}
function getRequestsForState(state) {
let requests;
switch (state) {
case FRAGMENT_MODEL_LOADING:
requests = loadingRequests;
break;
case FRAGMENT_MODEL_EXECUTED:
requests = executedRequests;
break;
default:
requests = [];
}
return requests;
}
function addSchedulingInfoMetrics(request, state) {
dashMetrics.addSchedulingInfo(request, state);
dashMetrics.addRequestsQueue(request.mediaType, loadingRequests, executedRequests);
}
function onLoadingCompleted(e) {
if (e.sender !== fragmentLoader) return;
loadingRequests.splice(loadingRequests.indexOf(e.request), 1);
if (e.response && !e.error) {
executedRequests.push(e.request);
}
addSchedulingInfoMetrics(e.request, e.error ? FRAGMENT_MODEL_FAILED : FRAGMENT_MODEL_EXECUTED);
eventBus.trigger(events.FRAGMENT_LOADING_COMPLETED,
{
request: e.request,
response: e.response,
error: e.error,
sender: this
},
{ streamId: streamInfo.id, mediaType: type }
);
}
function onLoadingInProgress(e) {
if (e.sender !== fragmentLoader) return;
eventBus.trigger(events.FRAGMENT_LOADING_PROGRESS,
{
request: e.request,
response: e.response,
error: e.error,
sender: this
},
{ streamId: streamInfo.id, mediaType: type }
);
}
function onLoadingAborted(e) {
if (e.sender !== fragmentLoader) return;
eventBus.trigger(events.FRAGMENT_LOADING_ABANDONED,
{ request: e.request },
{ streamId: streamInfo.id, mediaType: type }
);
}
function resetInitialSettings() {
executedRequests = [];
loadingRequests = [];
}
function reset() {
eventBus.off(events.LOADING_COMPLETED, onLoadingCompleted, this);
eventBus.off(events.LOADING_DATA_PROGRESS, onLoadingInProgress, this);
eventBus.off(events.LOADING_ABANDONED, onLoadingAborted, this);
if (fragmentLoader) {
fragmentLoader.reset();
}
resetInitialSettings();
}
function addExecutedRequest(request) {
executedRequests.push(request);
}
instance = {
getStreamId,
getType,
getRequests,
isFragmentLoaded,
isFragmentLoadedOrPending,
removeExecutedRequestsBeforeTime,
removeExecutedRequestsAfterTime,
syncExecutedRequestsWithBufferedRange,
abortRequests,
executeRequest,
reset,
resetInitialSettings,
addExecutedRequest
};
setup();
return instance;
}
FragmentModel.__dashjs_factory_name = 'FragmentModel';
const factory = FactoryMaker.getClassFactory(FragmentModel);
factory.FRAGMENT_MODEL_LOADING = FRAGMENT_MODEL_LOADING;
factory.FRAGMENT_MODEL_EXECUTED = FRAGMENT_MODEL_EXECUTED;
factory.FRAGMENT_MODEL_CANCELED = FRAGMENT_MODEL_CANCELED;
factory.FRAGMENT_MODEL_FAILED = FRAGMENT_MODEL_FAILED;
FactoryMaker.updateClassFactory(FragmentModel.__dashjs_factory_name, factory);
export default factory;
</code></pre></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><a href="/" class="sidebar-title sidebar-title-anchor">Home</a><div class="mobile-nav-links"></div><div 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