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: offline/OfflineStreamProcessor.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 DashHandler from '../dash/DashHandler';
import RepresentationController from '../dash/controllers/RepresentationController';
import FragmentModel from '../streaming/models/FragmentModel';
import FragmentLoader from '../streaming/FragmentLoader';
import URLUtils from '../streaming/utils/URLUtils';
import RequestModifier from '../streaming/utils/RequestModifier';
import SegmentsController from '../dash/controllers/SegmentsController';
function OfflineStreamProcessor(config) {
config = config || {};
const context = this.context;
const eventBus = config.eventBus;
const events = config.events;
const errors = config.errors;
const debug = config.debug;
const constants = config.constants;
const settings = config.settings;
const dashConstants = config.dashConstants;
const manifestId = config.id;
const type = config.type;
const streamInfo = config.streamInfo;
const errHandler = config.errHandler;
const mediaPlayerModel = config.mediaPlayerModel;
const abrController = config.abrController;
const playbackController = config.playbackController;
const adapter = config.adapter;
const dashMetrics = config.dashMetrics;
const baseURLController = config.baseURLController;
const timelineConverter = config.timelineConverter;
const bitrate = config.bitrate;
const offlineStoreController = config.offlineStoreController;
const completedCb = config.callbacks && config.callbacks.completed;
const progressCb = config.callbacks && config.callbacks.progression;
let instance,
logger,
mediaInfo,
indexHandler,
representationController,
fragmentModel,
updating,
downloadedSegments,
isInitialized,
segmentsController,
isStopped;
function setup() {
resetInitialSettings();
logger = debug.getLogger(instance);
segmentsController = SegmentsController(context).create({
events,
eventBus,
streamInfo,
timelineConverter,
dashConstants,
segmentBaseController: config.segmentBaseController,
type
});
indexHandler = DashHandler(context).create({
streamInfo: streamInfo,
type: type,
timelineConverter: timelineConverter,
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
baseURLController: baseURLController,
errHandler: errHandler,
settings: settings,
// boxParser: boxParser,
eventBus: eventBus,
events: events,
debug: debug,
requestModifier: RequestModifier(context).getInstance(),
dashConstants: dashConstants,
constants: constants,
segmentsController: segmentsController,
urlUtils: URLUtils(context).getInstance()
});
representationController = RepresentationController(context).create({
streamInfo: streamInfo,
type: type,
abrController: abrController,
dashMetrics: dashMetrics,
playbackController: playbackController,
timelineConverter: timelineConverter,
dashConstants: dashConstants,
events: events,
eventBus: eventBus,
errors: errors,
segmentsController: segmentsController
});
fragmentModel = FragmentModel(context).create({
streamInfo: streamInfo,
dashMetrics: dashMetrics,
fragmentLoader: FragmentLoader(context).create({
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
errHandler: errHandler,
requestModifier: RequestModifier(context).getInstance(),
settings: settings,
eventBus: eventBus,
events: events,
errors: errors,
constants: constants,
dashConstants: dashConstants,
urlUtils: URLUtils(context).getInstance()
}),
debug: debug,
eventBus: eventBus,
events: events
});
eventBus.on(events.STREAM_REQUESTING_COMPLETED, onStreamRequestingCompleted, instance);
eventBus.on(events.FRAGMENT_LOADING_COMPLETED, onFragmentLoadingCompleted, instance);
}
function initialize(_mediaInfo) {
mediaInfo = _mediaInfo;
indexHandler.initialize(false);
updateRepresentation(mediaInfo);
}
function isInitRequest(request) {
return request.type === 'InitializationSegment';
}
function onFragmentLoadingCompleted(e) {
if (e.sender !== fragmentModel) {
return;
}
if (e.request !== null) {
let isInit = isInitRequest(e.request);
let suffix = isInit ? 'init' : e.request.index;
let fragmentName = e.request.representationId + '_' + suffix;
offlineStoreController.storeFragment(manifestId, fragmentName, e.response)
.then(() => {
if (!isInit) {
// store current index and downloadedSegments number
offlineStoreController.setRepresentationCurrentState(manifestId, e.request.representationId, {
index: e.request.index,
downloaded: downloadedSegments
});
}
});
}
if (e.error && e.request.serviceLocation && !isStopped) {
fragmentModel.executeRequest(e.request);
} else {
downloadedSegments++;
download();
}
}
function onStreamRequestingCompleted(e) {
if (e.fragmentModel !== fragmentModel) {
return;
}
logger.info(`[${manifestId}] Stream is complete`);
stop();
completedCb();
}
function getRepresentationController() {
return representationController;
}
function getRepresentationId() {
return representationController.getCurrentRepresentation().id;
}
/**
* Stops download of fragments
* @memberof OfflineStreamProcessor#
*/
function stop() {
if (isStopped) {
return;
}
isStopped = true;
}
function removeExecutedRequestsBeforeTime(time) {
if (fragmentModel) {
fragmentModel.removeExecutedRequestsBeforeTime(time);
}
}
/**
* Execute init request for the represenation
* @memberof OfflineStreamProcessor#
*/
function getInitRequest() {
if (!representationController.getCurrentRepresentation()) {
return null;
}
return indexHandler.getInitRequest(getMediaInfo(), representationController.getCurrentRepresentation());
}
/**
* Get next request
* @memberof OfflineStreamProcessor#
*/
function getNextRequest() {
return indexHandler.getNextSegmentRequest(getMediaInfo(), representationController.getCurrentRepresentation());
}
/**
* Start download
* @memberof OfflineStreamProcessor#
*/
function start() {
if (representationController) {
if (!representationController.getCurrentRepresentation()) {
throw new Error('Start denied to OfflineStreamProcessor');
}
isStopped = false;
offlineStoreController.getRepresentationCurrentState(manifestId, representationController.getCurrentRepresentation().id)
.then((state) => {
if (state) {
indexHandler.setCurrentIndex(state.index);
downloadedSegments = state.downloaded;
}
download();
})
.catch(() => {
// start from beginining
download();
});
}
}
/**
* Performs download of fragment according to type
* @memberof OfflineStreamProcessor#
*/
function download() {
if (isStopped) {
return;
}
if (isNaN(representationController.getCurrentRepresentation())) {
let request = null;
if (!isInitialized) {
request = getInitRequest();
isInitialized = true;
} else {
request = getNextRequest();
// update progression : done here because availableSegmentsNumber is done in getNextRequest from dash handler
updateProgression();
}
if (request) {
logger.info(`[${manifestId}] download request : ${request.url}`);
fragmentModel.executeRequest(request);
} else {
logger.info(`[${manifestId}] no request to be downloaded`);
}
}
}
/**
* Update representation
* @param {Object} mediaInfo - mediaInfo
* @memberof OfflineStreamProcessor#
*/
function updateRepresentation(mediaInfo) {
updating = true;
let voRepresentations = adapter.getVoRepresentations(mediaInfo);
// get representation VO according to id.
let quality = voRepresentations.findIndex((representation) => {
return representation.id === bitrate.id;
});
if (type !== constants.VIDEO && type !== constants.AUDIO && type !== constants.TEXT) {
updating = false;
return;
}
representationController.updateData(null, voRepresentations, type, mediaInfo.isFragmented, quality);
}
function isUpdating() {
return updating;
}
function getType() {
return type;
}
function getMediaInfo() {
return mediaInfo;
}
function getAvailableSegmentsNumber() {
return representationController.getCurrentRepresentation().numberOfSegments + 1; // do not forget init segment
}
function updateProgression() {
if (progressCb) {
progressCb(instance, downloadedSegments, getAvailableSegmentsNumber());
}
}
function resetInitialSettings() {
isInitialized = false;
downloadedSegments = 0;
updating = false;
}
/**
* Reset
* @memberof OfflineStreamProcessor#
*/
function reset() {
resetInitialSettings();
indexHandler.reset();
eventBus.off(events.STREAM_REQUESTING_COMPLETED, onStreamRequestingCompleted, instance);
eventBus.off(events.FRAGMENT_LOADING_COMPLETED, onFragmentLoadingCompleted, instance);
}
instance = {
initialize: initialize,
getMediaInfo: getMediaInfo,
getRepresentationController: getRepresentationController,
removeExecutedRequestsBeforeTime: removeExecutedRequestsBeforeTime,
getType: getType,
getRepresentationId: getRepresentationId,
isUpdating: isUpdating,
start: start,
stop: stop,
getAvailableSegmentsNumber: getAvailableSegmentsNumber,
reset: reset
};
setup();
return instance;
}
OfflineStreamProcessor.__dashjs_factory_name = 'OfflineStreamProcessor';
const factory = dashjs.FactoryMaker.getClassFactory(OfflineStreamProcessor); /* jshint ignore:line */
export default factory;
</pre>
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$( "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>