1 /*
2 * Copyright (c) 2011 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 #include "modules/audio_coding/neteq/random_vector.h"
12
13 namespace webrtc {
14
15 const int16_t RandomVector::kRandomTable[RandomVector::kRandomTableSize] = {
16 2680, 5532, 441, 5520, 16170, -5146, -1024, -8733, 3115,
17 9598, -10380, -4959, -1280, -21716, 7133, -1522, 13458, -3902,
18 2789, -675, 3441, 5016, -13599, -4003, -2739, 3922, -7209,
19 13352, -11617, -7241, 12905, -2314, 5426, 10121, -9702, 11207,
20 -13542, 1373, 816, -5934, -12504, 4798, 1811, 4112, -613,
21 201, -10367, -2960, -2419, 3442, 4299, -6116, -6092, 1552,
22 -1650, -480, -1237, 18720, -11858, -8303, -8212, 865, -2890,
23 -16968, 12052, -5845, -5912, 9777, -5665, -6294, 5426, -4737,
24 -6335, 1652, 761, 3832, 641, -8552, -9084, -5753, 8146,
25 12156, -4915, 15086, -1231, -1869, 11749, -9319, -6403, 11407,
26 6232, -1683, 24340, -11166, 4017, -10448, 3153, -2936, 6212,
27 2891, -866, -404, -4807, -2324, -1917, -2388, -6470, -3895,
28 -10300, 5323, -5403, 2205, 4640, 7022, -21186, -6244, -882,
29 -10031, -3395, -12885, 7155, -5339, 5079, -2645, -9515, 6622,
30 14651, 15852, 359, 122, 8246, -3502, -6696, -3679, -13535,
31 -1409, -704, -7403, -4007, 1798, 279, -420, -12796, -14219,
32 1141, 3359, 11434, 7049, -6684, -7473, 14283, -4115, -9123,
33 -8969, 4152, 4117, 13792, 5742, 16168, 8661, -1609, -6095,
34 1881, 14380, -5588, 6758, -6425, -22969, -7269, 7031, 1119,
35 -1611, -5850, -11281, 3559, -8952, -10146, -4667, -16251, -1538,
36 2062, -1012, -13073, 227, -3142, -5265, 20, 5770, -7559,
37 4740, -4819, 992, -8208, -7130, -4652, 6725, 7369, -1036,
38 13144, -1588, -5304, -2344, -449, -5705, -8894, 5205, -17904,
39 -11188, -1022, 4852, 10101, -5255, -4200, -752, 7941, -1543,
40 5959, 14719, 13346, 17045, -15605, -1678, -1600, -9230, 68,
41 23348, 1172, 7750, 11212, -18227, 9956, 4161, 883, 3947,
42 4341, 1014, -4889, -2603, 1246, -5630, -3596, -870, -1298,
43 2784, -3317, -6612, -20541, 4166, 4181, -8625, 3562, 12890,
44 4761, 3205, -12259, -8579};
45
Reset()46 void RandomVector::Reset() {
47 seed_ = 777;
48 seed_increment_ = 1;
49 }
50
Generate(size_t length,int16_t * output)51 void RandomVector::Generate(size_t length, int16_t* output) {
52 for (size_t i = 0; i < length; i++) {
53 seed_ += seed_increment_;
54 size_t position = seed_ & (kRandomTableSize - 1);
55 output[i] = kRandomTable[position];
56 }
57 }
58
IncreaseSeedIncrement(int16_t increase_by)59 void RandomVector::IncreaseSeedIncrement(int16_t increase_by) {
60 seed_increment_ += increase_by;
61 seed_increment_ &= kRandomTableSize - 1;
62 }
63 } // namespace webrtc
64