dashjs
Version:
A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
40 lines (39 loc) • 3.06 kB
JavaScript
;Object.defineProperty(exports,"__esModule",{value:true});/**
* 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.
*//**
* @ignore
*/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=void 0,index=void 0,instance=void 0;function initialise(){if(crypto){if(!randomNumbers){randomNumbers=new ArrayType(NUM_RANDOM_NUMBERS);}crypto.getRandomValues(randomNumbers);index=0;}}function rand(min,max){var r=void 0;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 */
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