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91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
/*
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This file is a part of JRTPLIB
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Copyright (c) 1999-2017 Jori Liesenborgs
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Contact: jori.liesenborgs@gmail.com
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This library was developed at the Expertise Centre for Digital Media
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(http://www.edm.uhasselt.be), a research center of the Hasselt University
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(http://www.uhasselt.be). The library is based upon work done for
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my thesis at the School for Knowledge Technology (Belgium/The Netherlands).
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#include "rtprandomrand48.h"
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namespace qrtplib
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{
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RTPRandomRand48::RTPRandomRand48()
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{
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SetSeed(PickSeed());
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}
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RTPRandomRand48::RTPRandomRand48(uint32_t seed)
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{
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SetSeed(seed);
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}
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RTPRandomRand48::~RTPRandomRand48()
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{
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}
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void RTPRandomRand48::SetSeed(uint32_t seed)
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{
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state = ((uint64_t) seed) << 16 | 0x330EULL;
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}
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uint8_t RTPRandomRand48::GetRandom8()
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{
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uint32_t x = ((GetRandom32() >> 24) & 0xff);
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return (uint8_t) x;
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}
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uint16_t RTPRandomRand48::GetRandom16()
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{
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uint32_t x = ((GetRandom32() >> 16) & 0xffff);
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return (uint16_t) x;
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}
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uint32_t RTPRandomRand48::GetRandom32()
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{
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state = ((0x5DEECE66DULL * state) + 0xBULL) & 0x0000ffffffffffffULL;
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uint32_t x = (uint32_t) ((state >> 16) & 0xffffffffULL);
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return x;
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}
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double RTPRandomRand48::GetRandomDouble()
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{
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state = ((0x5DEECE66DULL * state) + 0xBULL) & 0x0000ffffffffffffULL;
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int64_t x = (int64_t) state;
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double y = 3.552713678800500929355621337890625e-15 * (double) x;
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return y;
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}
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} // end namespace
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