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 * SWB_KLT_Tables.c 13 * 14 * This file defines tables used for entropy coding of LPC shape of 15 * upper-band signal if the bandwidth is 12 kHz. 16 * 17 */ 18 19 #include "lpc_shape_swb12_tables.h" 20 #include "settings.h" 21 #include "webrtc/typedefs.h" 22 23 /* 24 * Mean value of LAR 25 */ 26 const double WebRtcIsac_kMeanLarUb12[UB_LPC_ORDER] = 27 { 28 0.03748928306641, 0.09453441192543, -0.01112522344398, 0.03800237516842 29 }; 30 31 /* 32 * A rotation matrix to decorrelate intra-vector correlation, 33 * i.e. correlation among components of LAR vector. 34 */ 35 const double WebRtcIsac_kIntraVecDecorrMatUb12[UB_LPC_ORDER][UB_LPC_ORDER] = 36 { 37 {-0.00075365493856, -0.05809964887743, -0.23397966154116, 0.97050367376411}, 38 { 0.00625021257734, -0.17299965610679, 0.95977735920651, 0.22104179375008}, 39 { 0.20543384258374, -0.96202143495696, -0.15301870801552, -0.09432375099565}, 40 {-0.97865075648479, -0.20300322280841, -0.02581111653779, -0.01913568980258} 41 }; 42 43 /* 44 * A rotation matrix to remove correlation among LAR coefficients 45 * of different LAR vectors. One might guess that decorrelation matrix 46 * for the first component should differ from the second component 47 * but we haven't observed a significant benefit of having different 48 * decorrelation matrices for different components. 49 */ 50 const double WebRtcIsac_kInterVecDecorrMatUb12 51 [UB_LPC_VEC_PER_FRAME][UB_LPC_VEC_PER_FRAME] = 52 { 53 { 0.70650597970460, -0.70770707262373}, 54 {-0.70770707262373, -0.70650597970460} 55 }; 56 57 /* 58 * LAR quantization step-size. 59 */ 60 const double WebRtcIsac_kLpcShapeQStepSizeUb12 = 0.150000; 61 62 /* 63 * The smallest reconstruction points for quantiztion of LAR coefficients. 64 */ 65 const double WebRtcIsac_kLpcShapeLeftRecPointUb12 66 [UB_LPC_ORDER*UB_LPC_VEC_PER_FRAME] = 67 { 68 -0.900000, -1.050000, -1.350000, -1.800000, -1.350000, -1.650000, 69 -2.250000, -3.450000 70 }; 71 72 /* 73 * Number of reconstruction points of quantizers for LAR coefficients. 74 */ 75 const int16_t WebRtcIsac_kLpcShapeNumRecPointUb12 76 [UB_LPC_ORDER * UB_LPC_VEC_PER_FRAME] = 77 { 78 13, 15, 19, 27, 19, 24, 32, 48 79 }; 80 81 /* 82 * Starting index for entropy decoder to search for the right interval, 83 * one entry per LAR coefficient 84 */ 85 const uint16_t WebRtcIsac_kLpcShapeEntropySearchUb12 86 [UB_LPC_ORDER * UB_LPC_VEC_PER_FRAME] = 87 { 88 6, 7, 9, 13, 9, 12, 16, 24 89 }; 90 91 /* 92 * The following 8 vectors define CDF of 8 decorrelated LAR 93 * coefficients. 94 */ 95 const uint16_t WebRtcIsac_kLpcShapeCdfVec0Ub12[14] = 96 { 97 0, 13, 95, 418, 1687, 6498, 21317, 44200, 59029, 63849, 65147, 98 65449, 65525, 65535 99 }; 100 101 const uint16_t WebRtcIsac_kLpcShapeCdfVec1Ub12[16] = 102 { 103 0, 10, 59, 255, 858, 2667, 8200, 22609, 42988, 57202, 62947, 104 64743, 65308, 65476, 65522, 65535 105 }; 106 107 const uint16_t WebRtcIsac_kLpcShapeCdfVec2Ub12[20] = 108 { 109 0, 18, 40, 118, 332, 857, 2017, 4822, 11321, 24330, 41279, 110 54342, 60637, 63394, 64659, 65184, 65398, 65482, 65518, 65535 111 }; 112 113 const uint16_t WebRtcIsac_kLpcShapeCdfVec3Ub12[28] = 114 { 115 0, 21, 38, 90, 196, 398, 770, 1400, 2589, 4650, 8211, 116 14933, 26044, 39592, 50814, 57452, 60971, 62884, 63995, 64621, 65019, 65273, 117 65410, 65480, 65514, 65522, 65531, 65535 118 }; 119 120 const uint16_t WebRtcIsac_kLpcShapeCdfVec4Ub12[20] = 121 { 122 0, 7, 46, 141, 403, 969, 2132, 4649, 10633, 24902, 43254, 123 54665, 59928, 62674, 64173, 64938, 65293, 65464, 65523, 65535 124 }; 125 126 const uint16_t WebRtcIsac_kLpcShapeCdfVec5Ub12[25] = 127 { 128 0, 7, 22, 72, 174, 411, 854, 1737, 3545, 6774, 13165, 129 25221, 40980, 52821, 58714, 61706, 63472, 64437, 64989, 65287, 65430, 65503, 130 65525, 65529, 65535 131 }; 132 133 const uint16_t WebRtcIsac_kLpcShapeCdfVec6Ub12[33] = 134 { 135 0, 11, 21, 36, 65, 128, 228, 401, 707, 1241, 2126, 136 3589, 6060, 10517, 18853, 31114, 42477, 49770, 54271, 57467, 59838, 61569, 137 62831, 63772, 64433, 64833, 65123, 65306, 65419, 65466, 65499, 65519, 65535 138 }; 139 140 const uint16_t WebRtcIsac_kLpcShapeCdfVec7Ub12[49] = 141 { 142 0, 14, 34, 67, 107, 167, 245, 326, 449, 645, 861, 143 1155, 1508, 2003, 2669, 3544, 4592, 5961, 7583, 9887, 13256, 18765, 144 26519, 34077, 40034, 44349, 47795, 50663, 53262, 55473, 57458, 59122, 60592, 145 61742, 62690, 63391, 63997, 64463, 64794, 65045, 65207, 65309, 65394, 65443, 146 65478, 65504, 65514, 65523, 65535 147 }; 148 149 /* 150 * An array of pointers to CDFs of decorrelated LARs 151 */ 152 const uint16_t* WebRtcIsac_kLpcShapeCdfMatUb12 153 [UB_LPC_ORDER * UB_LPC_VEC_PER_FRAME] = 154 { 155 WebRtcIsac_kLpcShapeCdfVec0Ub12, WebRtcIsac_kLpcShapeCdfVec1Ub12, 156 WebRtcIsac_kLpcShapeCdfVec2Ub12, WebRtcIsac_kLpcShapeCdfVec3Ub12, 157 WebRtcIsac_kLpcShapeCdfVec4Ub12, WebRtcIsac_kLpcShapeCdfVec5Ub12, 158 WebRtcIsac_kLpcShapeCdfVec6Ub12, WebRtcIsac_kLpcShapeCdfVec7Ub12 159 }; 160
