@l5i/dashjs/build/es5/src/streaming/net/FetchLoader.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 _utilsBoxParser=require('../utils/BoxParser');var _utilsBoxParser2=_interopRequireDefault(_utilsBoxParser); /**
* @module FetchLoader
* @description Manages download of resources via HTTP using fetch.
* @param {Object} cfg - dependencies from parent
*/function FetchLoader(cfg){cfg = cfg || {};var requestModifier=cfg.requestModifier;var instance=undefined;function load(httpRequest){ // Variables will be used in the callback functions
var firstProgress=true; /*jshint ignore:line*/var needFailureReport=true; /*jshint ignore:line*/var requestStartTime=new Date();var lastTraceTime=requestStartTime; /*jshint ignore:line*/var lastTraceReceivedCount=0; /*jshint ignore:line*/var request=httpRequest.request;var headers=new Headers(); /*jshint ignore:line*/if(request.range){headers.append('Range','bytes=' + request.range);}if(!request.requestStartDate){request.requestStartDate = requestStartTime;}if(requestModifier){ // modifyRequestHeader expects a XMLHttpRequest object so,
// to keep backward compatibility, we should expose a setRequestHeader method
// TODO: Remove RequestModifier dependency on XMLHttpRequest object and define
// a more generic way to intercept/modify requests
requestModifier.modifyRequestHeader({setRequestHeader:function setRequestHeader(header,value){headers.append(header,value);}});}var abortController=undefined;if(typeof window.AbortController === 'function'){abortController = new AbortController(); /*jshint ignore:line*/httpRequest.abortController = abortController;}var reqOptions={method:httpRequest.method,headers:headers,credentials:httpRequest.withCredentials?'include':undefined,signal:abortController?abortController.signal:undefined};fetch(httpRequest.url,reqOptions).then(function(response){if(!httpRequest.response){httpRequest.response = {};}httpRequest.response.status = response.status;httpRequest.response.statusText = response.statusText;httpRequest.response.responseURL = response.url;if(!response.ok){httpRequest.onerror();}var responseHeaders='';var _iteratorNormalCompletion=true;var _didIteratorError=false;var _iteratorError=undefined;try{for(var _iterator=response.headers.keys()[Symbol.iterator](),_step;!(_iteratorNormalCompletion = (_step = _iterator.next()).done);_iteratorNormalCompletion = true) {var key=_step.value;responseHeaders += key + ': ' + response.headers.get(key) + '\n';}}catch(err) {_didIteratorError = true;_iteratorError = err;}finally {try{if(!_iteratorNormalCompletion && _iterator['return']){_iterator['return']();}}finally {if(_didIteratorError){throw _iteratorError;}}}httpRequest.response.responseHeaders = responseHeaders;if(!response.body){ // Fetch returning a ReadableStream response body is not currently supported by all browsers.
// Browser compatibility: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
// If it is not supported, returning the whole segment when it's ready (as xhr)
return response.arrayBuffer().then(function(buffer){httpRequest.response.response = buffer;var event={loaded:buffer.byteLength,total:buffer.byteLength};httpRequest.progress(event);httpRequest.onload();httpRequest.onend();return;});}var totalBytes=parseInt(response.headers.get('Content-Length'),10);var bytesReceived=0;var signaledFirstByte=false;var remaining=new Uint8Array();var offset=0;httpRequest.reader = response.body.getReader();var downLoadedData=[];var processResult=function processResult(_ref){var value=_ref.value;var done=_ref.done;if(done){if(remaining){ // If there is pending data, call progress so network metrics
// are correctly generated
// Same structure as https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestEventTarget/onprogress
httpRequest.progress({loaded:bytesReceived,total:isNaN(totalBytes)?bytesReceived:totalBytes,lengthComputable:true,time:calculateDownloadedTime(downLoadedData,bytesReceived)});httpRequest.response.response = remaining.buffer;}httpRequest.onload();httpRequest.onend();return;}if(value && value.length > 0){remaining = concatTypedArray(remaining,value);bytesReceived += value.length;downLoadedData.push({ts:Date.now(),bytes:value.length});var boxesInfo=(0,_utilsBoxParser2['default'])().getInstance().findLastTopIsoBoxCompleted(['moov','mdat'],remaining,offset);if(boxesInfo.found){var end=boxesInfo.lastCompletedOffset + boxesInfo.size; // If we are going to pass full buffer, avoid copying it and pass
// complete buffer. Otherwise clone the part of the buffer that is completed
// and adjust remaining buffer. A clone is needed because ArrayBuffer of a typed-array
// keeps a reference to the original data
var data=undefined;if(end === remaining.length){data = remaining;remaining = new Uint8Array();}else {data = new Uint8Array(remaining.subarray(0,end));remaining = remaining.subarray(end);} // Announce progress but don't track traces. Throughput measures are quite unstable
// when they are based in small amount of data
httpRequest.progress({data:data.buffer,lengthComputable:false,noTrace:true});offset = 0;}else {offset = boxesInfo.lastCompletedOffset; // Call progress so it generates traces that will be later used to know when the first byte
// were received
if(!signaledFirstByte){httpRequest.progress({lengthComputable:false,noTrace:true});signaledFirstByte = true;}}}read(httpRequest,processResult);};read(httpRequest,processResult);})['catch'](function(e){if(httpRequest.onerror){httpRequest.onerror(e);}});}function read(httpRequest,processResult){httpRequest.reader.read().then(processResult)['catch'](function(e){if(httpRequest.onerror && httpRequest.response.status === 200){ // Error, but response code is 200, trigger error
httpRequest.onerror(e);}});}function concatTypedArray(remaining,data){if(remaining.length === 0){return data;}var result=new Uint8Array(remaining.length + data.length);result.set(remaining);result.set(data,remaining.length);return result;}function abort(request){if(request.abortController){ // For firefox and edge
request.abortController.abort();}else if(request.reader){ // For Chrome
try{request.reader.cancel();}catch(e) { // throw exceptions (TypeError) when reader was previously closed,
// for example, because a network issue
}}}function calculateDownloadedTime(datum,bytesReceived){datum = datum.filter(function(data){return data.bytes > bytesReceived / 4 / datum.length;});if(datum.length > 1){var _ret=(function(){var time=0;var avgTimeDistance=(datum[datum.length - 1].ts - datum[0].ts) / datum.length;datum.forEach(function(data,index){ // To be counted the data has to be over a threshold
var next=datum[index + 1];if(next){var distance=next.ts - data.ts;time += distance < avgTimeDistance?distance:0;}});return {v:time};})();if(typeof _ret === 'object')return _ret.v;}return null;}instance = {load:load,abort:abort,calculateDownloadedTime:calculateDownloadedTime};return instance;}FetchLoader.__dashjs_factory_name = 'FetchLoader';var factory=_coreFactoryMaker2['default'].getClassFactory(FetchLoader);exports['default'] = factory;module.exports = exports['default'];
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