henrik.lundin@webrtc.org | 9a40081 | 2013-01-29 12:09:21 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 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 |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ4_RANDOM_VECTOR_H_ |
| 12 | #define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_RANDOM_VECTOR_H_ |
| 13 | |
pbos@webrtc.org | 3f45c2e | 2013-08-05 16:22:53 +0000 | [diff] [blame] | 14 | #include <string.h> // size_t |
henrik.lundin@webrtc.org | 9a40081 | 2013-01-29 12:09:21 +0000 | [diff] [blame] | 15 | |
| 16 | #include "webrtc/system_wrappers/interface/constructor_magic.h" |
| 17 | #include "webrtc/typedefs.h" |
| 18 | |
| 19 | namespace webrtc { |
| 20 | |
| 21 | // This class generates pseudo-random samples. |
| 22 | class RandomVector { |
| 23 | public: |
| 24 | static const int kRandomTableSize = 256; |
| 25 | static const int16_t kRandomTable[kRandomTableSize]; |
| 26 | |
| 27 | RandomVector() |
| 28 | : seed_(777), |
| 29 | seed_increment_(1) { |
| 30 | } |
| 31 | |
| 32 | void Reset(); |
| 33 | |
| 34 | void Generate(size_t length, int16_t* output); |
| 35 | |
| 36 | void IncreaseSeedIncrement(int16_t increase_by); |
| 37 | |
| 38 | // Accessors and mutators. |
| 39 | int16_t seed_increment() { return seed_increment_; } |
| 40 | void set_seed_increment(int16_t value) { seed_increment_ = value; } |
| 41 | |
| 42 | private: |
| 43 | uint32_t seed_; |
| 44 | int16_t seed_increment_; |
| 45 | |
| 46 | DISALLOW_COPY_AND_ASSIGN(RandomVector); |
| 47 | }; |
| 48 | |
| 49 | } // namespace webrtc |
| 50 | #endif // WEBRTC_MODULES_AUDIO_CODING_NETEQ4_RANDOM_VECTOR_H_ |