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-rw-r--r--third_party/aom/test/acm_random.h84
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diff --git a/third_party/aom/test/acm_random.h b/third_party/aom/test/acm_random.h
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-/*
- * Copyright (c) 2016, Alliance for Open Media. All rights reserved
- *
- * This source code is subject to the terms of the BSD 2 Clause License and
- * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
- * was not distributed with this source code in the LICENSE file, you can
- * obtain it at www.aomedia.org/license/software. If the Alliance for Open
- * Media Patent License 1.0 was not distributed with this source code in the
- * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
- */
-
-#ifndef AOM_TEST_ACM_RANDOM_H_
-#define AOM_TEST_ACM_RANDOM_H_
-
-#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
-
-#include "aom/aom_integer.h"
-
-namespace libaom_test {
-
-class ACMRandom {
- public:
- ACMRandom() : random_(DeterministicSeed()) {}
-
- explicit ACMRandom(int seed) : random_(seed) {}
-
- void Reset(int seed) { random_.Reseed(seed); }
-
- uint32_t Rand31(void) {
- return random_.Generate(testing::internal::Random::kMaxRange);
- }
-
- uint16_t Rand16(void) {
- const uint32_t value =
- random_.Generate(testing::internal::Random::kMaxRange);
- return (value >> 15) & 0xffff;
- }
-
- int16_t Rand15Signed(void) {
- const uint32_t value =
- random_.Generate(testing::internal::Random::kMaxRange);
- return (value >> 17) & 0xffff;
- }
-
- uint16_t Rand12(void) {
- const uint32_t value =
- random_.Generate(testing::internal::Random::kMaxRange);
- // There's a bit more entropy in the upper bits of this implementation.
- return (value >> 19) & 0xfff;
- }
-
- int16_t Rand9Signed(void) {
- // Use 9 bits: values between 255 (0x0FF) and -256 (0x100).
- const uint32_t value = random_.Generate(512);
- return static_cast<int16_t>(value) - 256;
- }
-
- uint8_t Rand8(void) {
- const uint32_t value =
- random_.Generate(testing::internal::Random::kMaxRange);
- // There's a bit more entropy in the upper bits of this implementation.
- return (value >> 23) & 0xff;
- }
-
- uint8_t Rand8Extremes(void) {
- // Returns a random value near 0 or near 255, to better exercise
- // saturation behavior.
- const uint8_t r = Rand8();
- return r < 128 ? r << 4 : r >> 4;
- }
-
- int PseudoUniform(int range) { return random_.Generate(range); }
-
- int operator()(int n) { return PseudoUniform(n); }
-
- static int DeterministicSeed(void) { return 0xbaba; }
-
- private:
- testing::internal::Random random_;
-};
-
-} // namespace libaom_test
-
-#endif // AOM_TEST_ACM_RANDOM_H_