@l5i/dashjs/build/es5/src/dash/utils/TimelineConverter.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 _coreEventBus=require('../../core/EventBus');var _coreEventBus2=_interopRequireDefault(_coreEventBus);var _coreEventsEvents=require('../../core/events/Events');var _coreEventsEvents2=_interopRequireDefault(_coreEventsEvents);var _coreFactoryMaker=require('../../core/FactoryMaker');var _coreFactoryMaker2=_interopRequireDefault(_coreFactoryMaker);function TimelineConverter(){var context=this.context;var eventBus=(0,_coreEventBus2['default'])(context).getInstance();var instance=undefined,clientServerTimeShift=undefined,isClientServerTimeSyncCompleted=undefined,expectedLiveEdge=undefined;function initialize(){resetInitialSettings();eventBus.on(_coreEventsEvents2['default'].TIME_SYNCHRONIZATION_COMPLETED,onTimeSyncComplete,this);}function isTimeSyncCompleted(){return isClientServerTimeSyncCompleted;}function setTimeSyncCompleted(value){isClientServerTimeSyncCompleted = value;}function getClientTimeOffset(){return clientServerTimeShift;}function setClientTimeOffset(value){clientServerTimeShift = value;}function getExpectedLiveEdge(){return expectedLiveEdge;}function setExpectedLiveEdge(value){expectedLiveEdge = value;}function calcAvailabilityTimeFromPresentationTime(presentationTime,mpd,isDynamic,calculateEnd){var availabilityTime=NaN;if(calculateEnd){ //@timeShiftBufferDepth specifies the duration of the time shifting buffer that is guaranteed
// to be available for a Media Presentation with type 'dynamic'.
// When not present, the value is infinite.
if(isDynamic && mpd.timeShiftBufferDepth != Number.POSITIVE_INFINITY){availabilityTime = new Date(mpd.availabilityStartTime.getTime() + (presentationTime + mpd.timeShiftBufferDepth) * 1000);}else {availabilityTime = mpd.availabilityEndTime;}}else {if(isDynamic){availabilityTime = new Date(mpd.availabilityStartTime.getTime() + (presentationTime - clientServerTimeShift) * 1000);}else { // in static mpd, all segments are available at the same time
availabilityTime = mpd.availabilityStartTime;}}return availabilityTime;}function calcAvailabilityStartTimeFromPresentationTime(presentationTime,mpd,isDynamic){return calcAvailabilityTimeFromPresentationTime.call(this,presentationTime,mpd,isDynamic);}function calcAvailabilityEndTimeFromPresentationTime(presentationTime,mpd,isDynamic){return calcAvailabilityTimeFromPresentationTime.call(this,presentationTime,mpd,isDynamic,true);}function calcPresentationTimeFromWallTime(wallTime,period){return (wallTime.getTime() - period.mpd.availabilityStartTime.getTime() + clientServerTimeShift * 1000) / 1000;}function calcPresentationTimeFromMediaTime(mediaTime,representation){var periodStart=representation.adaptation.period.start;var presentationOffset=representation.presentationTimeOffset;return mediaTime + (periodStart - presentationOffset);}function calcMediaTimeFromPresentationTime(presentationTime,representation){var periodStart=representation.adaptation.period.start;var presentationOffset=representation.presentationTimeOffset;return presentationTime - periodStart + presentationOffset;}function calcWallTimeForSegment(segment,isDynamic){var suggestedPresentationDelay=undefined,displayStartTime=undefined,wallTime=undefined;if(isDynamic){suggestedPresentationDelay = segment.representation.adaptation.period.mpd.suggestedPresentationDelay;displayStartTime = segment.presentationStartTime + suggestedPresentationDelay;wallTime = new Date(segment.availabilityStartTime.getTime() + displayStartTime * 1000);}return wallTime;}function calcSegmentAvailabilityRange(voRepresentation,isDynamic){ // Static Range Finder
var voPeriod=voRepresentation.adaptation.period;var range={start:voPeriod.start,end:voPeriod.start + voPeriod.duration};if(!isDynamic)return range;if(!isClientServerTimeSyncCompleted && voRepresentation.segmentAvailabilityRange){return voRepresentation.segmentAvailabilityRange;} // Dynamic Range Finder
var d=voRepresentation.segmentDuration || (voRepresentation.segments && voRepresentation.segments.length?voRepresentation.segments[voRepresentation.segments.length - 1].duration:0);var now=calcPresentationTimeFromWallTime(new Date(),voPeriod);var periodEnd=voPeriod.start + voPeriod.duration;range.start = Math.max(now - voPeriod.mpd.timeShiftBufferDepth,voPeriod.start);var endOffset=voRepresentation.availabilityTimeOffset !== undefined && voRepresentation.availabilityTimeOffset < d?d - voRepresentation.availabilityTimeOffset:d;range.end = now >= periodEnd && now - endOffset < periodEnd?periodEnd:now - endOffset;return range;}function calcPeriodRelativeTimeFromMpdRelativeTime(representation,mpdRelativeTime){var periodStartTime=representation.adaptation.period.start;return mpdRelativeTime - periodStartTime;} /*
    * We need to figure out if we want to timesync for segmentTimeine where useCalculatedLiveEdge = true
    * seems we figure out client offset based on logic in liveEdgeFinder getLiveEdge timelineConverter.setClientTimeOffset(liveEdge - representationInfo.DVRWindow.end);
    * FYI StreamController's onManifestUpdated entry point to timeSync
    * */function onTimeSyncComplete(e){if(isClientServerTimeSyncCompleted)return;if(e.offset !== undefined){setClientTimeOffset(e.offset / 1000);isClientServerTimeSyncCompleted = true;}}function calcMSETimeOffset(representation){ // The MSEOffset is offset from AST for media. It is Period@start - presentationTimeOffset
var presentationOffset=representation.presentationTimeOffset;var periodStart=representation.adaptation.period.start;return periodStart - presentationOffset;}function resetInitialSettings(){clientServerTimeShift = 0;isClientServerTimeSyncCompleted = false;expectedLiveEdge = NaN;}function reset(){eventBus.off(_coreEventsEvents2['default'].TIME_SYNCHRONIZATION_COMPLETED,onTimeSyncComplete,this);resetInitialSettings();}instance = {initialize:initialize,isTimeSyncCompleted:isTimeSyncCompleted,setTimeSyncCompleted:setTimeSyncCompleted,getClientTimeOffset:getClientTimeOffset,setClientTimeOffset:setClientTimeOffset,getExpectedLiveEdge:getExpectedLiveEdge,setExpectedLiveEdge:setExpectedLiveEdge,calcAvailabilityStartTimeFromPresentationTime:calcAvailabilityStartTimeFromPresentationTime,calcAvailabilityEndTimeFromPresentationTime:calcAvailabilityEndTimeFromPresentationTime,calcPresentationTimeFromWallTime:calcPresentationTimeFromWallTime,calcPresentationTimeFromMediaTime:calcPresentationTimeFromMediaTime,calcPeriodRelativeTimeFromMpdRelativeTime:calcPeriodRelativeTimeFromMpdRelativeTime,calcMediaTimeFromPresentationTime:calcMediaTimeFromPresentationTime,calcSegmentAvailabilityRange:calcSegmentAvailabilityRange,calcWallTimeForSegment:calcWallTimeForSegment,calcMSETimeOffset:calcMSETimeOffset,reset:reset};return instance;}TimelineConverter.__dashjs_factory_name = 'TimelineConverter';exports['default'] = _coreFactoryMaker2['default'].getSingletonFactory(TimelineConverter);module.exports = exports['default'];
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