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_NETEQ_RANDOM_VECTOR_H_ 12 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_ 13 14 #include <string.h> // size_t 15 16 #include "webrtc/base/constructormagic.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_NETEQ_RANDOM_VECTOR_H_ 51
