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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* This file contains implementations of the randomization functions
* WebRtcSpl_RandU()
* WebRtcSpl_RandN()
* WebRtcSpl_RandUArray()
*
* The description header can be found in signal_processing_library.h
*
*/
#include "common_audio/signal_processing/include/signal_processing_library.h"
static const uint32_t kMaxSeedUsed = 0x80000000;
static const int16_t kRandNTable[] = {
9178, -7260, 40, 10189, 4894, -3531, -13779, 14764, -4008,
-8884, -8990, 1008, 7368, 5184, 3251, -5817, -9786, 5963,
1770, 8066, -7135, 10772, -2298, 1361, 6484, 2241, -8633,
792, 199, -3344, 6553, -10079, -15040, 95, 11608, -12469,
14161, -4176, 2476, 6403, 13685, -16005, 6646, 2239, 10916,
-3004, -602, -3141, 2142, 14144, -5829, 5305, 8209, 4713,
2697, -5112, 16092, -1210, -2891, -6631, -5360, -11878, -6781,
-2739, -6392, 536, 10923, 10872, 5059, -4748, -7770, 5477,
38, -1025, -2892, 1638, 6304, 14375, -11028, 1553, -1565,
10762, -393, 4040, 5257, 12310, 6554, -4799, 4899, -6354,
1603, -1048, -2220, 8247, -186, -8944, -12004, 2332, 4801,
-4933, 6371, 131, 8614, -5927, -8287, -22760, 4033, -15162,
3385, 3246, 3153, -5250, 3766, 784, 6494, -62, 3531,
-1582, 15572, 662, -3952, -330, -3196, 669, 7236, -2678,
-6569, 23319, -8645, -741, 14830, -15976, 4903, 315, -11342,
10311, 1858, -7777, 2145, 5436, 5677, -113, -10033, 826,
-1353, 17210, 7768, 986, -1471, 8291, -4982, 8207, -14911,
-6255, -2449, -11881, -7059, -11703, -4338, 8025, 7538, -2823,
-12490, 9470, -1613, -2529, -10092, -7807, 9480, 6970, -12844,
5123, 3532, 4816, 4803, -8455, -5045, 14032, -4378, -1643,
5756, -11041, -2732, -16618, -6430, -18375, -3320, 6098, 5131,
-4269, -8840, 2482, -7048, 1547, -21890, -6505, -7414, -424,
-11722, 7955, 1653, -17299, 1823, 473, -9232, 3337, 1111,
873, 4018, -8982, 9889, 3531, -11763, -3799, 7373, -4539,
3231, 7054, -8537, 7616, 6244, 16635, 447, -2915, 13967,
705, -2669, -1520, -1771, -16188, 5956, 5117, 6371, -9936,
-1448, 2480, 5128, 7550, -8130, 5236, 8213, -6443, 7707,
-1950, -13811, 7218, 7031, -3883, 67, 5731, -2874, 13480,
-3743, 9298, -3280, 3552, -4425, -18, -3785, -9988, -5357,
5477, -11794, 2117, 1416, -9935, 3376, 802, -5079, -8243,
12652, 66, 3653, -2368, 6781, -21895, -7227, 2487, 7839,
-385, 6646, -7016, -4658, 5531, -1705, 834, 129, 3694,
-1343, 2238, -22640, -6417, -11139, 11301, -2945, -3494, -5626,
185, -3615, -2041, -7972, -3106, -60, -23497, -1566, 17064,
3519, 2518, 304, -6805, -10269, 2105, 1936, -426, -736,
-8122, -1467, 4238, -6939, -13309, 360, 7402, -7970, 12576,
3287, 12194, -6289, -16006, 9171, 4042, -9193, 9123, -2512,
6388, -4734, -8739, 1028, -5406, -1696, 5889, -666, -4736,
4971, 3565, 9362, -6292, 3876, -3652, -19666, 7523, -4061,
391, -11773, 7502, -3763, 4929, -9478, 13278, 2805, 4496,
7814, 16419, 12455, -14773, 2127, -2746, 3763, 4847, 3698,
6978, 4751, -6957, -3581, -45, 6252, 1513, -4797, -7925,
11270, 16188, -2359, -5269, 9376, -10777, 7262, 20031, -6515,
-2208, -5353, 8085, -1341, -1303, 7333, 5576, 3625, 5763,
-7931, 9833, -3371, -10305, 6534, -13539, -9971, 997, 8464,
-4064, -1495, 1857, 13624, 5458, 9490, -11086, -4524, 12022,
-550, -198, 408, -8455, -7068, 10289, 9712, -3366, 9028,
-7621, -5243, 2362, 6909, 4672, -4933, -1799, 4709, -4563,
-62, -566, 1624, -7010, 14730, -17791, -3697, -2344, -1741,
7099, -9509, -6855, -1989, 3495, -2289, 2031, 12784, 891,
14189, -3963, -5683, 421, -12575, 1724, -12682, -5970, -8169,
3143, -1824, -5488, -5130, 8536, 12799, 794, 5738, 3459,
-11689, -258, -3738, -3775, -8742, 2333, 8312, -9383, 10331,
13119, 8398, 10644, -19433, -6446, -16277, -11793, 16284, 9345,
15222, 15834, 2009, -7349, 130, -14547, 338, -5998, 3337,
21492, 2406, 7703, -951, 11196, -564, 3406, 2217, 4806,
2374, -5797, 11839, 8940, -11874, 18213, 2855, 10492};
static uint32_t IncreaseSeed(uint32_t* seed) {
seed[0] = (seed[0] * ((int32_t)69069) + 1) & (kMaxSeedUsed - 1);
return seed[0];
}
int16_t WebRtcSpl_RandU(uint32_t* seed) {
return (int16_t)(IncreaseSeed(seed) >> 16);
}
int16_t WebRtcSpl_RandN(uint32_t* seed) {
return kRandNTable[IncreaseSeed(seed) >> 23];
}
// Creates an array of uniformly distributed variables.
int16_t WebRtcSpl_RandUArray(int16_t* vector,
int16_t vector_length,
uint32_t* seed) {
int i;
for (i = 0; i < vector_length; i++) {
vector[i] = WebRtcSpl_RandU(seed);
}
return vector_length;
}
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