@l5i/dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
39 lines (38 loc) • 5.72 kB
JavaScript
/**
* 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);function FragmentedTextBoxParser(){var instance=undefined,boxParser=undefined;function setConfig(config){if(!config)return;if(config.boxParser){boxParser = config.boxParser;}}function getSamplesInfo(ab){if(!boxParser){throw new Error('boxParser is undefined');}if(!ab || ab.byteLength === 0){return {sampleList:[],lastSequenceNumber:NaN,totalDuration:NaN,numSequences:NaN};}var isoFile=boxParser.parse(ab); // zero or more moofs
var moofBoxes=isoFile.getBoxes('moof'); // exactly one mfhd per moof
var mfhdBoxes=isoFile.getBoxes('mfhd');var sampleDuration=undefined,sampleCompositionTimeOffset=undefined,sampleCount=undefined,sampleSize=undefined,sampleDts=undefined,sampleList=undefined,sample=undefined,i=undefined,j=undefined,k=undefined,l=undefined,m=undefined,n=undefined,dataOffset=undefined,lastSequenceNumber=undefined,numSequences=undefined,totalDuration=undefined;numSequences = isoFile.getBoxes('moof').length;lastSequenceNumber = mfhdBoxes[mfhdBoxes.length - 1].sequence_number;sampleCount = 0;sampleList = [];var subsIndex=-1;var nextSubsSample=-1;for(l = 0;l < moofBoxes.length;l++) {var moofBox=moofBoxes[l]; // zero or more trafs per moof
var trafBoxes=moofBox.getChildBoxes('traf');for(j = 0;j < trafBoxes.length;j++) {var trafBox=trafBoxes[j]; // exactly one tfhd per traf
var tfhdBox=trafBox.getChildBox('tfhd'); // zero or one tfdt per traf
var tfdtBox=trafBox.getChildBox('tfdt');sampleDts = tfdtBox.baseMediaDecodeTime; // zero or more truns per traf
var trunBoxes=trafBox.getChildBoxes('trun'); // zero or more subs per traf
var subsBoxes=trafBox.getChildBoxes('subs');for(k = 0;k < trunBoxes.length;k++) {var trunBox=trunBoxes[k];sampleCount = trunBox.sample_count;dataOffset = (tfhdBox.base_data_offset || 0) + (trunBox.data_offset || 0);for(i = 0;i < sampleCount;i++) {sample = trunBox.samples[i];sampleDuration = sample.sample_duration !== undefined?sample.sample_duration:tfhdBox.default_sample_duration;sampleSize = sample.sample_size !== undefined?sample.sample_size:tfhdBox.default_sample_size;sampleCompositionTimeOffset = sample.sample_composition_time_offset !== undefined?sample.sample_composition_time_offset:0;var sampleData={'dts':sampleDts,'cts':sampleDts + sampleCompositionTimeOffset,'duration':sampleDuration,'offset':moofBox.offset + dataOffset,'size':sampleSize,'subSizes':[sampleSize]};if(subsBoxes){for(m = 0;m < subsBoxes.length;m++) {var subsBox=subsBoxes[m];if(subsIndex < subsBox.entry_count - 1 && i > nextSubsSample){subsIndex++;nextSubsSample += subsBox.entries[subsIndex].sample_delta;}if(i == nextSubsSample){sampleData.subSizes = [];var entry=subsBox.entries[subsIndex];for(n = 0;n < entry.subsample_count;n++) {sampleData.subSizes.push(entry.subsamples[n].subsample_size);}}}}sampleList.push(sampleData);dataOffset += sampleSize;sampleDts += sampleDuration;}}totalDuration = sampleDts - tfdtBox.baseMediaDecodeTime;}}return {sampleList:sampleList,lastSequenceNumber:lastSequenceNumber,totalDuration:totalDuration,numSequences:numSequences};}function getMediaTimescaleFromMoov(ab){if(!boxParser){throw new Error('boxParser is undefined');}var isoFile=boxParser.parse(ab);var mdhdBox=isoFile?isoFile.getBox('mdhd'):undefined;return mdhdBox?mdhdBox.timescale:NaN;}instance = {getSamplesInfo:getSamplesInfo,getMediaTimescaleFromMoov:getMediaTimescaleFromMoov,setConfig:setConfig};return instance;}FragmentedTextBoxParser.__dashjs_factory_name = 'FragmentedTextBoxParser';exports['default'] = _coreFactoryMaker2['default'].getSingletonFactory(FragmentedTextBoxParser);module.exports = exports['default'];
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