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Side by Side Diff: media/blink/test_random.h

Issue 1534273002: Switch to standard integer types in media/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: more Created 5 years ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved. 1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef MEDIA_BLINK_TEST_RANDOM_H_ 5 #ifndef MEDIA_BLINK_TEST_RANDOM_H_
6 #define MEDIA_BLINK_TEST_RANDOM_H_ 6 #define MEDIA_BLINK_TEST_RANDOM_H_
7 7
8 // Vastly simplified ACM random class meant to only be used for testing. 8 // Vastly simplified ACM random class meant to only be used for testing.
9 // This class is meant to generate predictable sequences of pseudorandom 9 // This class is meant to generate predictable sequences of pseudorandom
10 // numbers, unlike the classes in base/rand_util.h which are meant to generate 10 // numbers, unlike the classes in base/rand_util.h which are meant to generate
11 // unpredictable sequences. 11 // unpredictable sequences.
12 // See 12 // See
13 // https://code.google.com/p/szl/source/browse/trunk/src/utilities/acmrandom.h 13 // https://code.google.com/p/szl/source/browse/trunk/src/utilities/acmrandom.h
14 // for more information. 14 // for more information.
15 15
16 namespace media { 16 namespace media {
17 17
18 class TestRandom { 18 class TestRandom {
19 public: 19 public:
20 explicit TestRandom(uint32_t seed) { 20 explicit TestRandom(uint32_t seed) {
21 seed_ = seed & 0x7fffffff; // make this a non-negative number 21 seed_ = seed & 0x7fffffff; // make this a non-negative number
22 if (seed_ == 0 || seed_ == M) { 22 if (seed_ == 0 || seed_ == M) {
23 seed_ = 1; 23 seed_ = 1;
24 } 24 }
25 } 25 }
26 26
27 int32_t Rand() { 27 int32_t Rand() {
28 static const uint64 A = 16807; // bits 14, 8, 7, 5, 2, 1, 0 28 static const uint64_t A = 16807; // bits 14, 8, 7, 5, 2, 1, 0
29 seed_ = static_cast<int32_t>((seed_ * A) % M); 29 seed_ = static_cast<int32_t>((seed_ * A) % M);
30 CHECK_GT(seed_, 0); 30 CHECK_GT(seed_, 0);
31 return seed_; 31 return seed_;
32 } 32 }
33 33
34 private: 34 private:
35 static const uint64 M = 2147483647L; // 2^32-1 35 static const uint64_t M = 2147483647L; // 2^32-1
36 int32_t seed_; 36 int32_t seed_;
37 }; 37 };
38 38
39 } // namespace media 39 } // namespace media
40 40
41 #endif // MEDIA_BLINK_TEST_RANDOM_H_ 41 #endif // MEDIA_BLINK_TEST_RANDOM_H_
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