@l5i/dashjs/build/es5/src/dash/SegmentBaseLoader.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 _streamingUtilsRequestModifier=require('../streaming/utils/RequestModifier');var _streamingUtilsRequestModifier2=_interopRequireDefault(_streamingUtilsRequestModifier);var _voSegment=require('./vo/Segment');var _voSegment2=_interopRequireDefault(_voSegment);var _streamingVoDashJSError=require('../streaming/vo/DashJSError');var _streamingVoDashJSError2=_interopRequireDefault(_streamingVoDashJSError);var _coreEventsEvents=require('../core/events/Events');var _coreEventsEvents2=_interopRequireDefault(_coreEventsEvents);var _coreEventBus=require('../core/EventBus');var _coreEventBus2=_interopRequireDefault(_coreEventBus);var _streamingUtilsBoxParser=require('../streaming/utils/BoxParser');var _streamingUtilsBoxParser2=_interopRequireDefault(_streamingUtilsBoxParser);var _coreFactoryMaker=require('../core/FactoryMaker');var _coreFactoryMaker2=_interopRequireDefault(_coreFactoryMaker);var _coreDebug=require('../core/Debug');var _coreDebug2=_interopRequireDefault(_coreDebug);var _streamingVoMetricsHTTPRequest=require('../streaming/vo/metrics/HTTPRequest');var _streamingVoFragmentRequest=require('../streaming/vo/FragmentRequest');var _streamingVoFragmentRequest2=_interopRequireDefault(_streamingVoFragmentRequest);var _streamingNetHTTPLoader=require('../streaming/net/HTTPLoader');var _streamingNetHTTPLoader2=_interopRequireDefault(_streamingNetHTTPLoader);var _coreErrorsErrors=require('../core/errors/Errors');var _coreErrorsErrors2=_interopRequireDefault(_coreErrorsErrors);function SegmentBaseLoader(){var context=this.context;var eventBus=(0,_coreEventBus2['default'])(context).getInstance();var instance=undefined,logger=undefined,errHandler=undefined,boxParser=undefined,requestModifier=undefined,metricsModel=undefined,mediaPlayerModel=undefined,httpLoader=undefined,baseURLController=undefined;function setup(){logger = (0,_coreDebug2['default'])(context).getInstance().getLogger(instance);}function initialize(){boxParser = (0,_streamingUtilsBoxParser2['default'])(context).getInstance();requestModifier = (0,_streamingUtilsRequestModifier2['default'])(context).getInstance();httpLoader = (0,_streamingNetHTTPLoader2['default'])(context).create({errHandler:errHandler,metricsModel:metricsModel,mediaPlayerModel:mediaPlayerModel,requestModifier:requestModifier});}function setConfig(config){if(config.baseURLController){baseURLController = config.baseURLController;}if(config.metricsModel){metricsModel = config.metricsModel;}if(config.mediaPlayerModel){mediaPlayerModel = config.mediaPlayerModel;}if(config.errHandler){errHandler = config.errHandler;}}function checkSetConfigCall(){if(!baseURLController || !baseURLController.hasOwnProperty('resolve')){throw new Error('setConfig function has to be called previously');}}function loadInitialization(representation,loadingInfo){checkSetConfigCall();var initRange=null;var isoFile=null;var baseUrl=baseURLController.resolve(representation.path);var info=loadingInfo || {init:true,url:baseUrl?baseUrl.url:undefined,range:{start:0,end:1500},searching:false,bytesLoaded:0,bytesToLoad:1500};logger.debug('Start searching for initialization.');var request=getFragmentRequest(info);var onload=function onload(response){info.bytesLoaded = info.range.end;isoFile = boxParser.parse(response);initRange = findInitRange(isoFile);if(initRange){representation.range = initRange; // note that we don't explicitly set rep.initialization as this
// will be computed when all BaseURLs are resolved later
eventBus.trigger(_coreEventsEvents2['default'].INITIALIZATION_LOADED,{representation:representation});}else {info.range.end = info.bytesLoaded + info.bytesToLoad;loadInitialization(representation,info);}};var onerror=function onerror(){eventBus.trigger(_coreEventsEvents2['default'].INITIALIZATION_LOADED,{representation:representation});};httpLoader.load({request:request,success:onload,error:onerror});logger.debug('Perform init search: ' + info.url);}function loadSegments(representation,type,range,loadingInfo,callback){checkSetConfigCall();if(range && (range.start === undefined || range.end === undefined)){var parts=range?range.toString().split('-'):null;range = parts?{start:parseFloat(parts[0]),end:parseFloat(parts[1])}:null;}callback = !callback?onLoaded:callback;var isoFile=null;var sidx=null;var hasRange=!!range;var baseUrl=baseURLController.resolve(representation.path);var info={init:false,url:baseUrl?baseUrl.url:undefined,range:hasRange?range:{start:0,end:1500},searching:!hasRange,bytesLoaded:loadingInfo?loadingInfo.bytesLoaded:0,bytesToLoad:1500};var request=getFragmentRequest(info);var onload=function onload(response){var extraBytes=info.bytesToLoad;var loadedLength=response.byteLength;info.bytesLoaded = info.range.end - info.range.start;isoFile = boxParser.parse(response);sidx = isoFile.getBox('sidx');if(!sidx || !sidx.isComplete){if(sidx){info.range.start = sidx.offset || info.range.start;info.range.end = info.range.start + (sidx.size || extraBytes);}else if(loadedLength < info.bytesLoaded){ // if we have reached a search limit or if we have reached the end of the file we have to stop trying to find sidx
callback(null,representation,type);return;}else {var lastBox=isoFile.getLastBox();if(lastBox && lastBox.size){info.range.start = lastBox.offset + lastBox.size;info.range.end = info.range.start + extraBytes;}else {info.range.end += extraBytes;}}loadSegments(representation,type,info.range,info,callback);}else {var ref=sidx.references;var loadMultiSidx=undefined,segments=undefined;if(ref !== null && ref !== undefined && ref.length > 0){loadMultiSidx = ref[0].reference_type === 1;}if(loadMultiSidx){(function(){logger.debug('Initiate multiple SIDX load.');info.range.end = info.range.start + sidx.size;var j=undefined,len=undefined,ss=undefined,se=undefined,r=undefined;var segs=[];var count=0;var offset=(sidx.offset || info.range.start) + sidx.size;var tmpCallback=function tmpCallback(result){if(result){segs = segs.concat(result);count++;if(count >= len){callback(segs,representation,type);}}else {callback(null,representation,type);}};for(j = 0,len = ref.length;j < len;j++) {ss = offset;se = offset + ref[j].referenced_size - 1;offset = offset + ref[j].referenced_size;r = {start:ss,end:se};loadSegments(representation,null,r,info,tmpCallback);}})();}else {logger.debug('Parsing segments from SIDX.');segments = getSegmentsForSidx(sidx,info);callback(segments,representation,type);}}};var onerror=function onerror(){callback(null,representation,type);};httpLoader.load({request:request,success:onload,error:onerror});logger.debug('Perform SIDX load: ' + info.url);}function reset(){httpLoader.abort();httpLoader = null;errHandler = null;boxParser = null;requestModifier = null;}function getSegmentsForSidx(sidx,info){var refs=sidx.references;var len=refs.length;var timescale=sidx.timescale;var time=sidx.earliest_presentation_time;var start=info.range.start + sidx.offset + sidx.first_offset + sidx.size;var segments=[];var segment=undefined,end=undefined,duration=undefined,size=undefined;for(var i=0;i < len;i++) {duration = refs[i].subsegment_duration;size = refs[i].referenced_size;segment = new _voSegment2['default'](); // note that we don't explicitly set segment.media as this will be
// computed when all BaseURLs are resolved later
segment.duration = duration;segment.startTime = time;segment.timescale = timescale;end = start + size - 1;segment.mediaRange = start + '-' + end;segments.push(segment);time += duration;start += size;}return segments;}function findInitRange(isoFile){var ftyp=isoFile.getBox('ftyp');var moov=isoFile.getBox('moov');var initRange=null;var start=undefined,end=undefined;logger.debug('Searching for initialization.');if(moov && moov.isComplete){start = ftyp?ftyp.offset:moov.offset;end = moov.offset + moov.size - 1;initRange = start + '-' + end;logger.debug('Found the initialization.  Range: ' + initRange);}return initRange;}function getFragmentRequest(info){if(!info.url){return;}var request=new _streamingVoFragmentRequest2['default']();request.type = info.init?_streamingVoMetricsHTTPRequest.HTTPRequest.INIT_SEGMENT_TYPE:_streamingVoMetricsHTTPRequest.HTTPRequest.MEDIA_SEGMENT_TYPE;request.url = info.url;request.range = info.range.start + '-' + info.range.end;return request;}function onLoaded(segments,representation,type){if(segments){eventBus.trigger(_coreEventsEvents2['default'].SEGMENTS_LOADED,{segments:segments,representation:representation,mediaType:type});}else {eventBus.trigger(_coreEventsEvents2['default'].SEGMENTS_LOADED,{segments:null,representation:representation,mediaType:type,error:new _streamingVoDashJSError2['default'](_coreErrorsErrors2['default'].SEGMENT_BASE_LOADER_ERROR_CODE,_coreErrorsErrors2['default'].SEGMENT_BASE_LOADER_ERROR_MESSAGE)});}}instance = {setConfig:setConfig,initialize:initialize,loadInitialization:loadInitialization,loadSegments:loadSegments,reset:reset};setup();return instance;}SegmentBaseLoader.__dashjs_factory_name = 'SegmentBaseLoader';exports['default'] = _coreFactoryMaker2['default'].getSingletonFactory(SegmentBaseLoader);module.exports = exports['default'];
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