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- // 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
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