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1 /* | 1 /* |
2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 #include "webrtc/rtc_base/random.h" | 10 #include "webrtc/base/random.h" |
11 | 11 |
12 #include <math.h> | 12 #include <math.h> |
13 | 13 |
14 #include "webrtc/rtc_base/checks.h" | 14 #include "webrtc/base/checks.h" |
15 | 15 |
16 namespace webrtc { | 16 namespace webrtc { |
17 | 17 |
18 Random::Random(uint64_t seed) { | 18 Random::Random(uint64_t seed) { |
19 RTC_DCHECK(seed != 0x0ull); | 19 RTC_DCHECK(seed != 0x0ull); |
20 state_ = seed; | 20 state_ = seed; |
21 } | 21 } |
22 | 22 |
23 uint32_t Random::Rand(uint32_t t) { | 23 uint32_t Random::Rand(uint32_t t) { |
24 // Casting the output to 32 bits will give an almost uniform number. | 24 // Casting the output to 32 bits will give an almost uniform number. |
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77 double u2 = static_cast<double>(NextOutput()) / 0xFFFFFFFFFFFFFFFFull; | 77 double u2 = static_cast<double>(NextOutput()) / 0xFFFFFFFFFFFFFFFFull; |
78 return mean + standard_deviation * sqrt(-2 * log(u1)) * cos(2 * kPi * u2); | 78 return mean + standard_deviation * sqrt(-2 * log(u1)) * cos(2 * kPi * u2); |
79 } | 79 } |
80 | 80 |
81 double Random::Exponential(double lambda) { | 81 double Random::Exponential(double lambda) { |
82 double uniform = Rand<double>(); | 82 double uniform = Rand<double>(); |
83 return -log(uniform) / lambda; | 83 return -log(uniform) / lambda; |
84 } | 84 } |
85 | 85 |
86 } // namespace webrtc | 86 } // namespace webrtc |
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