random_vector.h (1328B)
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 MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_ 12 #define MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_ 13 14 #include <stddef.h> 15 #include <stdint.h> 16 17 namespace webrtc { 18 19 // This class generates pseudo-random samples. 20 class RandomVector { 21 public: 22 static const size_t kRandomTableSize = 256; 23 static const int16_t kRandomTable[kRandomTableSize]; 24 25 RandomVector() : seed_(777), seed_increment_(1) {} 26 27 RandomVector(const RandomVector&) = delete; 28 RandomVector& operator=(const RandomVector&) = delete; 29 30 void Reset(); 31 32 void Generate(size_t length, int16_t* output); 33 34 void IncreaseSeedIncrement(int16_t increase_by); 35 36 // Accessors and mutators. 37 int16_t seed_increment() { return seed_increment_; } 38 void set_seed_increment(int16_t value) { seed_increment_ = value; } 39 40 private: 41 uint32_t seed_; 42 int16_t seed_increment_; 43 }; 44 45 } // namespace webrtc 46 #endif // MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_