| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "media/learning/impl/test_random_number_generator.h" |
| |
| namespace media { |
| |
| TestRandomNumberGenerator::TestRandomNumberGenerator(uint32_t seed) { |
| seed_ = seed & 0x7fffffff; // make this a non-negative number |
| if (seed_ == 0 || seed_ == M) { |
| seed_ = 1; |
| } |
| } |
| |
| TestRandomNumberGenerator::~TestRandomNumberGenerator() = default; |
| |
| uint64_t TestRandomNumberGenerator::Generate() { |
| static const uint64_t A = 16807; // bits 14, 8, 7, 5, 2, 1, 0 |
| uint64_t result = seed_ = static_cast<int32_t>((seed_ * A) % M); |
| result <<= 32; |
| result |= seed_ = static_cast<int32_t>((seed_ * A) % M); |
| return result; |
| } |
| |
| } // namespace media |
