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 #include "rtc_base/constructor_magic.h" 18 19 namespace webrtc { 20 21 // This class generates pseudo-random samples. 22 class RandomVector { 23 public: 24 static const size_t kRandomTableSize = 256; 25 static const int16_t kRandomTable[kRandomTableSize]; 26 RandomVector()27 RandomVector() : seed_(777), seed_increment_(1) {} 28 29 void Reset(); 30 31 void Generate(size_t length, int16_t* output); 32 33 void IncreaseSeedIncrement(int16_t increase_by); 34 35 // Accessors and mutators. seed_increment()36 int16_t seed_increment() { return seed_increment_; } set_seed_increment(int16_t value)37 void set_seed_increment(int16_t value) { seed_increment_ = value; } 38 39 private: 40 uint32_t seed_; 41 int16_t seed_increment_; 42 43 RTC_DISALLOW_COPY_AND_ASSIGN(RandomVector); 44 }; 45 46 } // namespace webrtc 47 #endif // MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_ 48