dashjs/build/es5/src/streaming/thumbnail/ThumbnailTracks.js

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

'use strict';Object.defineProperty(exports,"__esModule",{value:true});exports.THUMBNAILS_SCHEME_ID_URIS=undefined;var _Constants=require('../constants/Constants');var _Constants2=_interopRequireDefault(_Constants);var _DashConstants=require('../../dash/constants/DashConstants');var _DashConstants2=_interopRequireDefault(_DashConstants);var _FactoryMaker=require('../../core/FactoryMaker');var _FactoryMaker2=_interopRequireDefault(_FactoryMaker);var _ThumbnailTrackInfo=require('../vo/ThumbnailTrackInfo');var _ThumbnailTrackInfo2=_interopRequireDefault(_ThumbnailTrackInfo);var _URLUtils=require('../../streaming/utils/URLUtils');var _URLUtils2=_interopRequireDefault(_URLUtils);var _SegmentsUtils=require('../../dash/utils/SegmentsUtils');var _SegmentBaseLoader=require('../../dash/SegmentBaseLoader');var _SegmentBaseLoader2=_interopRequireDefault(_SegmentBaseLoader);var _BoxParser=require('../../streaming/utils/BoxParser');var _BoxParser2=_interopRequireDefault(_BoxParser);var _XHRLoader=require('../../streaming/net/XHRLoader');var _XHRLoader2=_interopRequireDefault(_XHRLoader);function _interopRequireDefault(obj){return obj&&obj.__esModule?obj:{default:obj};}var THUMBNAILS_SCHEME_ID_URIS=exports.THUMBNAILS_SCHEME_ID_URIS=['http://dashif.org/thumbnail_tile','http://dashif.org/guidelines/thumbnail_tile'];/**
 * 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.
 */function ThumbnailTracks(config){var context=this.context;var adapter=config.adapter;var baseURLController=config.baseURLController;var stream=config.stream;var timelineConverter=config.timelineConverter;var dashMetrics=config.dashMetrics;var mediaPlayerModel=config.mediaPlayerModel;var errHandler=config.errHandler;var urlUtils=(0,_URLUtils2.default)(context).getInstance();var instance=void 0,tracks=void 0,currentTrackIndex=void 0,loader=void 0,segmentBaseLoader=void 0,boxParser=void 0;function initialize(){reset();loader=(0,_XHRLoader2.default)(context).create({});boxParser=(0,_BoxParser2.default)(context).getInstance();segmentBaseLoader=(0,_SegmentBaseLoader2.default)(context).getInstance();segmentBaseLoader.setConfig({baseURLController:baseURLController,dashMetrics:dashMetrics,mediaPlayerModel:mediaPlayerModel,errHandler:errHandler});// parse representation and create tracks
addTracks();}function normalizeSegments(fragments,representation){var segments=[];var count=0;var i=void 0,len=void 0,s=void 0,seg=void 0;for(i=0,len=fragments.length;i<len;i++){s=fragments[i];seg=(0,_SegmentsUtils.getTimeBasedSegment)(timelineConverter,adapter.getIsDynamic(),representation,s.startTime,s.duration,s.timescale,s.media,s.mediaRange,count);if(seg){segments.push(seg);seg=null;count++;}}return segments;}function addTracks(){if(!stream||!adapter){return;}var streamInfo=stream.getStreamInfo();if(!streamInfo){return;}// Extract thumbnail tracks
var mediaInfo=adapter.getMediaInfoForType(streamInfo,_Constants2.default.IMAGE);if(!mediaInfo){return;}var voReps=adapter.getVoRepresentations(mediaInfo);if(voReps&&voReps.length>0){voReps.forEach(function(rep){if(rep.segmentInfoType===_DashConstants2.default.SEGMENT_TEMPLATE&&rep.segmentDuration>0&&rep.media)createTrack(rep);if(rep.segmentInfoType===_DashConstants2.default.SEGMENT_BASE)createTrack(rep,true);});}if(tracks.length>0){// Sort bitrates and select the lowest bitrate rendition
tracks.sort(function(a,b){return a.bitrate-b.bitrate;});currentTrackIndex=tracks.length-1;}}function createTrack(representation,useSegmentBase){var track=new _ThumbnailTrackInfo2.default();track.id=representation.id;track.bitrate=representation.bandwidth;track.width=representation.width;track.height=representation.height;track.tilesHor=1;track.tilesVert=1;if(representation.essentialProperties){representation.essentialProperties.forEach(function(p){if(THUMBNAILS_SCHEME_ID_URIS.indexOf(p.schemeIdUri)>=0&&p.value){var vars=p.value.split('x');if(vars.length===2&&!isNaN(vars[0])&&!isNaN(vars[1])){track.tilesHor=parseInt(vars[0],10);track.tilesVert=parseInt(vars[1],10);}}});}if(useSegmentBase){segmentBaseLoader.loadSegments(representation,_Constants2.default.IMAGE,representation.indexRange,{},function(segments,representation){var cache=[];segments=normalizeSegments(segments,representation);track.segmentDuration=segments[0].duration;//assume all segments have the same duration
track.readThumbnail=function(time,callback){var cached=null;cache.some(function(el){if(el.start<=time&&el.end>time){cached=el.url;return true;}});if(cached){callback(cached);}else{segments.some(function(ss){if(ss.mediaStartTime<=time&&ss.mediaStartTime+ss.duration>time){var baseURL=baseURLController.resolve(representation.path);loader.load({method:'get',url:baseURL.url,request:{range:ss.mediaRange,responseType:'arraybuffer'},onload:function onload(e){var info=boxParser.getSamplesInfo(e.target.response);var blob=new Blob([e.target.response.slice(info.sampleList[0].offset,info.sampleList[0].offset+info.sampleList[0].size)],{type:'image/jpeg'});var imageUrl=window.URL.createObjectURL(blob);cache.push({start:ss.mediaStartTime,end:ss.mediaStartTime+ss.duration,url:imageUrl});if(callback)callback(imageUrl);}});return true;}});}};});}else{track.startNumber=representation.startNumber;track.segmentDuration=representation.segmentDuration;track.timescale=representation.timescale;track.templateUrl=buildTemplateUrl(representation);}if(track.tilesHor>0&&track.tilesVert>0){// Precalculate width and heigth per tile for perf reasons
track.widthPerTile=track.width/track.tilesHor;track.heightPerTile=track.height/track.tilesVert;tracks.push(track);}}function buildTemplateUrl(representation){var templateUrl=urlUtils.isRelative(representation.media)?urlUtils.resolve(representation.media,baseURLController.resolve(representation.path).url):representation.media;if(!templateUrl){return'';}return(0,_SegmentsUtils.replaceIDForTemplate)(templateUrl,representation.id);}function getTracks(){return tracks;}function getCurrentTrackIndex(){return currentTrackIndex;}function getCurrentTrack(){if(currentTrackIndex<0){return null;}return tracks[currentTrackIndex];}function setTrackByIndex(index){if(!tracks||tracks.length===0){return;}// select highest bitrate in case selected index is higher than bitrate list length
if(index>=tracks.length){index=tracks.length-1;}currentTrackIndex=index;}function reset(){tracks=[];currentTrackIndex=-1;}instance={initialize:initialize,getTracks:getTracks,reset:reset,setTrackByIndex:setTrackByIndex,getCurrentTrack:getCurrentTrack,getCurrentTrackIndex:getCurrentTrackIndex};initialize();return instance;}ThumbnailTracks.__dashjs_factory_name='ThumbnailTracks';exports.default=_FactoryMaker2.default.getClassFactory(ThumbnailTracks);
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