@l5i/dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
38 lines (37 loc) • 3.13 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 RNG(){ // check whether secure random numbers are available. if not, revert to
// using Math.random
var crypto=window.crypto || window.msCrypto; // could just as easily use any other array type by changing line below
var ArrayType=Uint32Array;var MAX_VALUE=Math.pow(2,ArrayType.BYTES_PER_ELEMENT * 8) - 1; // currently there is only one client for this code, and that only uses
// a single random number per initialisation. may want to increase this
// number if more consumers in the future
var NUM_RANDOM_NUMBERS=10;var randomNumbers=undefined,index=undefined,instance=undefined;function initialise(){if(crypto){if(!randomNumbers){randomNumbers = new ArrayType(NUM_RANDOM_NUMBERS);}crypto.getRandomValues(randomNumbers);index = 0;}}function rand(min,max){var r=undefined;if(!min){min = 0;}if(!max){max = 1;}if(crypto){if(index === randomNumbers.length){initialise();}r = randomNumbers[index] / MAX_VALUE;index += 1;}else {r = Math.random();}return r * (max - min) + min;}instance = {random:rand};initialise();return instance;}RNG.__dashjs_factory_name = 'RNG';exports['default'] = dashjs.FactoryMaker.getSingletonFactory(RNG); /* jshint ignore:line */module.exports = exports['default'];
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