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/models/FragmentModel.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 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;
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if ( lang && lang[1] ) {
exampleText = exampleText.replace( lang[0], "" );
example.html( exampleText );
lang = lang[1];
} else {
var langClassMatch = example.parent()[0].className.match(/lang\-(\S+)/);
lang = langClassMatch ? langClassMatch[1] : "javascript";
}
if ( lang ) {
$this
.addClass( "sunlight-highlight-" + lang )
.addClass( "linenums" )
.html( example.html() );
}
} );
Sunlight.highlightAll( {
lineNumbers : true,
showMenu : true,
enableDoclinks : true
} );
$.catchAnchorLinks( {
navbarOffset: 10
} );
$( "#toc" ).toc( {
anchorName : function ( i, heading, prefix ) {
return $( heading ).attr( "id" ) || ( prefix + i );
},
selectors : "#toc-content h1,#toc-content h2,#toc-content h3,#toc-content h4",
showAndHide : false,
smoothScrolling: true
} );
$( "#main span[id^='toc']" ).addClass( "toc-shim" );
$( '.dropdown-toggle' ).dropdown();
$( "table" ).each( function () {
var $this = $( this );
$this.addClass('table');
} );
} );
</script>
<!--Navigation and Symbol Display-->
<script>
$( function () {
$( '#main' ).localScroll( {
offset : { top : 60 } //offset by the height of your header (give or take a few px, see what works for you)
} );
$( "dt.name" ).each( function () {
var $this = $( this ).find("h4");
var icon = $( "<i/>" ).addClass( "icon-plus-sign" ).addClass( "pull-right" ).addClass( "icon-white" );
var dt = $(this);
var children = dt.next( "dd" );
dt.prepend( icon ).css( {cursor : "pointer"} );
dt.addClass( "member-collapsed" ).addClass( "member" );
children.hide();
dt.children().on( "click", function () {
children = dt.next( "dd" );
children.slideToggle( "fast", function () {
if ( children.is( ":visible" ) ) {
icon.addClass( "icon-minus-sign" ).removeClass( "icon-plus-sign" ).removeClass( "icon-white" );
dt.addClass( "member-open" ).animate( "member-collapsed" );
} else {
icon.addClass( "icon-plus-sign" ).removeClass( "icon-minus-sign" ).addClass( "icon-white" );
dt.addClass( "member-collapsed" ).removeClass( "member-open" );
}
} );
} );
} );
} );
</script>
<!--Google Analytics-->
<script type="text/javascript">
$(document).ready(function() {
SearcherDisplay.init();
});
</script>
</body>
</html>