@l5i/dashjs/build/es5/src/streaming/controllers/EventController.js

A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.

/**
 * 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.
 */'use strict';Object.defineProperty(exports,'__esModule',{value:true});function _interopRequireDefault(obj){return obj && obj.__esModule?obj:{'default':obj};}var _coreFactoryMaker=require('../../core/FactoryMaker');var _coreFactoryMaker2=_interopRequireDefault(_coreFactoryMaker);var _coreDebug=require('../../core/Debug');var _coreDebug2=_interopRequireDefault(_coreDebug);var _coreEventBus=require('../../core/EventBus');var _coreEventBus2=_interopRequireDefault(_coreEventBus);var _coreEventsEvents=require('../../core/events/Events');var _coreEventsEvents2=_interopRequireDefault(_coreEventsEvents);function EventController(){var MPD_RELOAD_SCHEME='urn:mpeg:dash:event:2012';var MPD_RELOAD_VALUE=1;var context=this.context;var eventBus=(0,_coreEventBus2['default'])(context).getInstance();var instance=undefined,logger=undefined,inlineEvents=undefined, // Holds all Inline Events not triggered yet
inbandEvents=undefined, // Holds all Inband Events not triggered yet
activeEvents=undefined, // Holds all Events currently running
eventInterval=undefined, // variable holding the setInterval
refreshDelay=undefined, // refreshTime for the setInterval
presentationTimeThreshold=undefined,manifestUpdater=undefined,playbackController=undefined,isStarted=undefined;function setup(){logger = (0,_coreDebug2['default'])(context).getInstance().getLogger(instance);resetInitialSettings();}function resetInitialSettings(){isStarted = false;inlineEvents = {};inbandEvents = {};activeEvents = {};eventInterval = null;refreshDelay = 100;presentationTimeThreshold = refreshDelay / 1000;}function checkSetConfigCall(){if(!manifestUpdater || !playbackController){throw new Error('setConfig function has to be called previously');}}function stop(){if(eventInterval !== null && isStarted){clearInterval(eventInterval);eventInterval = null;isStarted = false;}}function start(){checkSetConfigCall();logger.debug('Start Event Controller');if(!isStarted && !isNaN(refreshDelay)){isStarted = true;eventInterval = setInterval(onEventTimer,refreshDelay);}} /**
     * Add events to the eventList. Events that are not in the mpd anymore but not triggered yet will still be deleted
     * @param {Array.<Object>} values
     */function addInlineEvents(values){checkSetConfigCall();inlineEvents = {};if(values){for(var i=0;i < values.length;i++) {var event=values[i];inlineEvents[event.id] = event;logger.debug('Add inline event with id ' + event.id);}}logger.debug('Added ' + values.length + ' inline events');} /**
     * i.e. processing of any one event message box with the same id is sufficient
     * @param {Array.<Object>} values
     */function addInbandEvents(values){checkSetConfigCall();for(var i=0;i < values.length;i++) {var event=values[i];if(!(event.id in inbandEvents)){if(event.eventStream.schemeIdUri === MPD_RELOAD_SCHEME && inbandEvents[event.id] === undefined){handleManifestReloadEvent(event);}inbandEvents[event.id] = event;logger.debug('Add inband event with id ' + event.id);}else {logger.debug('Repeated event with id ' + event.id);}}}function handleManifestReloadEvent(event){if(event.eventStream.value == MPD_RELOAD_VALUE){var timescale=event.eventStream.timescale || 1;var validUntil=event.presentationTime / timescale;var newDuration=undefined;if(event.presentationTime == 0xFFFFFFFF){ //0xFF... means remaining duration unknown
newDuration = NaN;}else {newDuration = (event.presentationTime + event.duration) / timescale;}logger.info('Manifest validity changed: Valid until: ' + validUntil + '; remaining duration: ' + newDuration);eventBus.trigger(_coreEventsEvents2['default'].MANIFEST_VALIDITY_CHANGED,{id:event.id,validUntil:validUntil,newDuration:newDuration,newManifestValidAfter:NaN //event.message_data - this is an arraybuffer with a timestring in it, but not used yet
});}} /**
     * Remove events which are over from the list
     */function removeEvents(){if(activeEvents){var currentVideoTime=playbackController.getTime();var eventIds=Object.keys(activeEvents);for(var i=0;i < eventIds.length;i++) {var eventId=eventIds[i];var curr=activeEvents[eventId];if(curr !== null && (curr.duration + curr.presentationTime) / curr.eventStream.timescale < currentVideoTime){logger.debug('Remove Event ' + eventId + ' at time ' + currentVideoTime);curr = null;delete activeEvents[eventId];}}}} /**
     * Iterate through the eventList and trigger/remove the events
     */function onEventTimer(){triggerEvents(inbandEvents);triggerEvents(inlineEvents);removeEvents();}function refreshManifest(){checkSetConfigCall();manifestUpdater.refreshManifest();}function triggerEvents(events){var currentVideoTime=playbackController.getTime();var presentationTime; /* == Trigger events that are ready == */if(events){var eventIds=Object.keys(events);for(var i=0;i < eventIds.length;i++) {var eventId=eventIds[i];var curr=events[eventId];if(curr !== undefined){presentationTime = curr.presentationTime / curr.eventStream.timescale;if(presentationTime === 0 || presentationTime <= currentVideoTime && presentationTime + presentationTimeThreshold > currentVideoTime){logger.debug('Start Event ' + eventId + ' at ' + currentVideoTime);if(curr.duration > 0){activeEvents[eventId] = curr;}if(curr.eventStream.schemeIdUri == MPD_RELOAD_SCHEME && curr.eventStream.value == MPD_RELOAD_VALUE){if(curr.duration !== 0 || curr.presentationTimeDelta !== 0){ //If both are set to zero, it indicates the media is over at this point. Don't reload the manifest.
refreshManifest();}}else {eventBus.trigger(curr.eventStream.schemeIdUri,{event:curr});}delete events[eventId];}}}}}function setConfig(config){if(!config)return;if(config.manifestUpdater){manifestUpdater = config.manifestUpdater;}if(config.playbackController){playbackController = config.playbackController;}}function reset(){stop();resetInitialSettings();}instance = {addInlineEvents:addInlineEvents,addInbandEvents:addInbandEvents,stop:stop,start:start,setConfig:setConfig,reset:reset};setup();return instance;}EventController.__dashjs_factory_name = 'EventController';exports['default'] = _coreFactoryMaker2['default'].getClassFactory(EventController);module.exports = exports['default'];
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