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 12 /* 13 * This file contains implementations of the randomization functions 14 * WebRtcSpl_RandU() 15 * WebRtcSpl_RandN() 16 * WebRtcSpl_RandUArray() 17 * 18 * The description header can be found in signal_processing_library.h 19 * 20 */ 21 22 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" 23 24 static const uint32_t kMaxSeedUsed = 0x80000000; 25 26 static const int16_t kRandNTable[] = { 27 9178, -7260, 40, 10189, 4894, -3531, -13779, 14764, 28 -4008, -8884, -8990, 1008, 7368, 5184, 3251, -5817, 29 -9786, 5963, 1770, 8066, -7135, 10772, -2298, 1361, 30 6484, 2241, -8633, 792, 199, -3344, 6553, -10079, 31 -15040, 95, 11608, -12469, 14161, -4176, 2476, 6403, 32 13685, -16005, 6646, 2239, 10916, -3004, -602, -3141, 33 2142, 14144, -5829, 5305, 8209, 4713, 2697, -5112, 34 16092, -1210, -2891, -6631, -5360, -11878, -6781, -2739, 35 -6392, 536, 10923, 10872, 5059, -4748, -7770, 5477, 36 38, -1025, -2892, 1638, 6304, 14375, -11028, 1553, 37 -1565, 10762, -393, 4040, 5257, 12310, 6554, -4799, 38 4899, -6354, 1603, -1048, -2220, 8247, -186, -8944, 39 -12004, 2332, 4801, -4933, 6371, 131, 8614, -5927, 40 -8287, -22760, 4033, -15162, 3385, 3246, 3153, -5250, 41 3766, 784, 6494, -62, 3531, -1582, 15572, 662, 42 -3952, -330, -3196, 669, 7236, -2678, -6569, 23319, 43 -8645, -741, 14830, -15976, 4903, 315, -11342, 10311, 44 1858, -7777, 2145, 5436, 5677, -113, -10033, 826, 45 -1353, 17210, 7768, 986, -1471, 8291, -4982, 8207, 46 -14911, -6255, -2449, -11881, -7059, -11703, -4338, 8025, 47 7538, -2823, -12490, 9470, -1613, -2529, -10092, -7807, 48 9480, 6970, -12844, 5123, 3532, 4816, 4803, -8455, 49 -5045, 14032, -4378, -1643, 5756, -11041, -2732, -16618, 50 -6430, -18375, -3320, 6098, 5131, -4269, -8840, 2482, 51 -7048, 1547, -21890, -6505, -7414, -424, -11722, 7955, 52 1653, -17299, 1823, 473, -9232, 3337, 1111, 873, 53 4018, -8982, 9889, 3531, -11763, -3799, 7373, -4539, 54 3231, 7054, -8537, 7616, 6244, 16635, 447, -2915, 55 13967, 705, -2669, -1520, -1771, -16188, 5956, 5117, 56 6371, -9936, -1448, 2480, 5128, 7550, -8130, 5236, 57 8213, -6443, 7707, -1950, -13811, 7218, 7031, -3883, 58 67, 5731, -2874, 13480, -3743, 9298, -3280, 3552, 59 -4425, -18, -3785, -9988, -5357, 5477, -11794, 2117, 60 1416, -9935, 3376, 802, -5079, -8243, 12652, 66, 61 3653, -2368, 6781, -21895, -7227, 2487, 7839, -385, 62 6646, -7016, -4658, 5531, -1705, 834, 129, 3694, 63 -1343, 2238, -22640, -6417, -11139, 11301, -2945, -3494, 64 -5626, 185, -3615, -2041, -7972, -3106, -60, -23497, 65 -1566, 17064, 3519, 2518, 304, -6805, -10269, 2105, 66 1936, -426, -736, -8122, -1467, 4238, -6939, -13309, 67 360, 7402, -7970, 12576, 3287, 12194, -6289, -16006, 68 9171, 4042, -9193, 9123, -2512, 6388, -4734, -8739, 69 1028, -5406, -1696, 5889, -666, -4736, 4971, 3565, 70 9362, -6292, 3876, -3652, -19666, 7523, -4061, 391, 71 -11773, 7502, -3763, 4929, -9478, 13278, 2805, 4496, 72 7814, 16419, 12455, -14773, 2127, -2746, 3763, 4847, 73 3698, 6978, 4751, -6957, -3581, -45, 6252, 1513, 74 -4797, -7925, 11270, 16188, -2359, -5269, 9376, -10777, 75 7262, 20031, -6515, -2208, -5353, 8085, -1341, -1303, 76 7333, 5576, 3625, 5763, -7931, 9833, -3371, -10305, 77 6534, -13539, -9971, 997, 8464, -4064, -1495, 1857, 78 13624, 5458, 9490, -11086, -4524, 12022, -550, -198, 79 408, -8455, -7068, 10289, 9712, -3366, 9028, -7621, 80 -5243, 2362, 6909, 4672, -4933, -1799, 4709, -4563, 81 -62, -566, 1624, -7010, 14730, -17791, -3697, -2344, 82 -1741, 7099, -9509, -6855, -1989, 3495, -2289, 2031, 83 12784, 891, 14189, -3963, -5683, 421, -12575, 1724, 84 -12682, -5970, -8169, 3143, -1824, -5488, -5130, 8536, 85 12799, 794, 5738, 3459, -11689, -258, -3738, -3775, 86 -8742, 2333, 8312, -9383, 10331, 13119, 8398, 10644, 87 -19433, -6446, -16277, -11793, 16284, 9345, 15222, 15834, 88 2009, -7349, 130, -14547, 338, -5998, 3337, 21492, 89 2406, 7703, -951, 11196, -564, 3406, 2217, 4806, 90 2374, -5797, 11839, 8940, -11874, 18213, 2855, 10492 91 }; 92 93 static uint32_t IncreaseSeed(uint32_t* seed) { 94 seed[0] = (seed[0] * ((int32_t)69069) + 1) & (kMaxSeedUsed - 1); 95 return seed[0]; 96 } 97 98 int16_t WebRtcSpl_RandU(uint32_t* seed) { 99 return (int16_t)(IncreaseSeed(seed) >> 16); 100 } 101 102 int16_t WebRtcSpl_RandN(uint32_t* seed) { 103 return kRandNTable[IncreaseSeed(seed) >> 23]; 104 } 105 106 // Creates an array of uniformly distributed variables. 107 int16_t WebRtcSpl_RandUArray(int16_t* vector, 108 int16_t vector_length, 109 uint32_t* seed) { 110 int i; 111 for (i = 0; i < vector_length; i++) { 112 vector[i] = WebRtcSpl_RandU(seed); 113 } 114 return vector_length; 115 } 116
