1 /* Effect: dither/noise-shape Copyright (c) 2008-9 robs@users.sourceforge.net 2 * 3 * This library is free software; you can redistribute it and/or modify it 4 * under the terms of the GNU Lesser General Public License as published by 5 * the Free Software Foundation; either version 2.1 of the License, or (at 6 * your option) any later version. 7 * 8 * This library is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU Lesser General Public License 14 * along with this library; if not, write to the Free Software Foundation, 15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 16 */ 17 18 typedef struct { 19 int rate; 20 enum {fir, iir} type; 21 size_t len; 22 int gain_cB; /* Chosen so clips are few if any, but not guaranteed none. */ 23 double const * coefs; 24 enum SwrDitherType name; 25 } filter_t; 26 27 static double const lip44[] = {2.033, -2.165, 1.959, -1.590, .6149}; 28 static double const fwe44[] = { 29 2.412, -3.370, 3.937, -4.174, 3.353, -2.205, 1.281, -.569, .0847}; 30 static double const mew44[] = { 31 1.662, -1.263, .4827, -.2913, .1268, -.1124, .03252, -.01265, -.03524}; 32 static double const iew44[] = { 33 2.847, -4.685, 6.214, -7.184, 6.639, -5.032, 3.263, -1.632, .4191}; 34 35 static double const shi48[] = { 36 2.8720729351043701172, -5.0413231849670410156, 6.2442994117736816406, 37 -5.8483986854553222656, 3.7067542076110839844, -1.0495119094848632812, 38 -1.1830236911773681641, 2.1126792430877685547, -1.9094531536102294922, 39 0.99913084506988525391, -0.17090806365013122559, -0.32615602016448974609, 40 0.39127644896507263184, -0.26876461505889892578, 0.097676105797290802002, 41 -0.023473845794796943665, 42 }; 43 static double const shi44[] = { 44 2.6773197650909423828, -4.8308925628662109375, 6.570110321044921875, 45 -7.4572014808654785156, 6.7263274192810058594, -4.8481650352478027344, 46 2.0412089824676513672, 0.7006359100341796875, -2.9537565708160400391, 47 4.0800385475158691406, -4.1845216751098632812, 3.3311812877655029297, 48 -2.1179926395416259766, 0.879302978515625, -0.031759146600961685181, 49 -0.42382788658142089844, 0.47882103919982910156, -0.35490813851356506348, 50 0.17496839165687561035, -0.060908168554306030273, 51 }; 52 static double const shi38[] = { 53 1.6335992813110351562, -2.2615492343902587891, 2.4077029228210449219, 54 -2.6341717243194580078, 2.1440362930297851562, -1.8153258562088012695, 55 1.0816224813461303711, -0.70302653312683105469, 0.15991993248462677002, 56 0.041549518704414367676, -0.29416576027870178223, 0.2518316805362701416, 57 -0.27766478061676025391, 0.15785403549671173096, -0.10165894031524658203, 58 0.016833892092108726501, 59 }; 60 static double const shi32[] = 61 { /* dmaker 32000: bestmax=4.99659 (inverted) */ 62 0.82118552923202515, 63 -1.0063692331314087, 64 0.62341964244842529, 65 -1.0447187423706055, 66 0.64532512426376343, 67 -0.87615132331848145, 68 0.52219754457473755, 69 -0.67434263229370117, 70 0.44954317808151245, 71 -0.52557498216629028, 72 0.34567299485206604, 73 -0.39618203043937683, 74 0.26791760325431824, 75 -0.28936097025871277, 76 0.1883765310049057, 77 -0.19097308814525604, 78 0.10431359708309174, 79 -0.10633844882249832, 80 0.046832218766212463, 81 -0.039653312414884567, 82 }; 83 static double const shi22[] = 84 { /* dmaker 22050: bestmax=5.77762 (inverted) */ 85 0.056581053882837296, 86 -0.56956905126571655, 87 -0.40727734565734863, 88 -0.33870288729667664, 89 -0.29810553789138794, 90 -0.19039161503314972, 91 -0.16510021686553955, 92 -0.13468159735202789, 93 -0.096633769571781158, 94 -0.081049129366874695, 95 -0.064953058958053589, 96 -0.054459091275930405, 97 -0.043378707021474838, 98 -0.03660014271736145, 99 -0.026256965473294258, 100 -0.018786206841468811, 101 -0.013387725688517094, 102 -0.0090983230620622635, 103 -0.0026585909072309732, 104 -0.00042083300650119781, 105 }; 106 static double const shi16[] = 107 { /* dmaker 16000: bestmax=5.97128 (inverted) */ 108 -0.37251132726669312, 109 -0.81423574686050415, 110 -0.55010956525802612, 111 -0.47405767440795898, 112 -0.32624706625938416, 113 -0.3161766529083252, 114 -0.2286367267370224, 115 -0.22916607558727264, 116 -0.19565616548061371, 117 -0.18160104751586914, 118 -0.15423151850700378, 119 -0.14104481041431427, 120 -0.11844276636838913, 121 -0.097583092749118805, 122 -0.076493598520755768, 123 -0.068106919527053833, 124 -0.041881654411554337, 125 -0.036922425031661987, 126 -0.019364040344953537, 127 -0.014994367957115173, 128 }; 129 static double const shi11[] = 130 { /* dmaker 11025: bestmax=5.9406 (inverted) */ 131 -0.9264228343963623, 132 -0.98695987462997437, 133 -0.631156325340271, 134 -0.51966935396194458, 135 -0.39738872647285461, 136 -0.35679301619529724, 137 -0.29720726609230042, 138 -0.26310476660728455, 139 -0.21719355881214142, 140 -0.18561814725399017, 141 -0.15404847264289856, 142 -0.12687471508979797, 143 -0.10339745879173279, 144 -0.083688631653785706, 145 -0.05875682458281517, 146 -0.046893671154975891, 147 -0.027950936928391457, 148 -0.020740609616041183, 149 -0.009366452693939209, 150 -0.0060260160826146603, 151 }; 152 static double const shi08[] = 153 { /* dmaker 8000: bestmax=5.56234 (inverted) */ 154 -1.202863335609436, 155 -0.94103097915649414, 156 -0.67878556251525879, 157 -0.57650017738342285, 158 -0.50004476308822632, 159 -0.44349345564842224, 160 -0.37833768129348755, 161 -0.34028723835945129, 162 -0.29413089156150818, 163 -0.24994957447052002, 164 -0.21715600788593292, 165 -0.18792112171649933, 166 -0.15268312394618988, 167 -0.12135542929172516, 168 -0.099610626697540283, 169 -0.075273610651493073, 170 -0.048787496984004974, 171 -0.042586319148540497, 172 -0.028991291299462318, 173 -0.011869125068187714, 174 }; 175 static double const shl48[] = { 176 2.3925774097442626953, -3.4350297451019287109, 3.1853709220886230469, 177 -1.8117271661758422852, -0.20124770700931549072, 1.4759907722473144531, 178 -1.7210904359817504883, 0.97746700048446655273, -0.13790138065814971924, 179 -0.38185903429985046387, 0.27421241998672485352, 0.066584214568138122559, 180 -0.35223302245140075684, 0.37672343850135803223, -0.23964276909828186035, 181 0.068674825131893157959, 182 }; 183 static double const shl44[] = { 184 2.0833916664123535156, -3.0418450832366943359, 3.2047898769378662109, 185 -2.7571926116943359375, 1.4978630542755126953, -0.3427594602108001709, 186 -0.71733748912811279297, 1.0737057924270629883, -1.0225815773010253906, 187 0.56649994850158691406, -0.20968692004680633545, -0.065378531813621520996, 188 0.10322438180446624756, -0.067442022264003753662, -0.00495197344571352005, 189 0, 190 }; 191 static double const shh44[] = { 192 3.0259189605712890625, -6.0268716812133789062, 9.195003509521484375, 193 -11.824929237365722656, 12.767142295837402344, -11.917946815490722656, 194 9.1739168167114257812, -5.3712320327758789062, 1.1393624544143676758, 195 2.4484779834747314453, -4.9719839096069335938, 6.0392003059387207031, 196 -5.9359521865844726562, 4.903278350830078125, -3.5527443885803222656, 197 2.1909697055816650391, -1.1672389507293701172, 0.4903914332389831543, 198 -0.16519790887832641602, 0.023217858746647834778, 199 }; 200 201 static const filter_t filters[] = { 202 {44100, fir, 5, 210, lip44, SWR_DITHER_NS_LIPSHITZ}, 203 {46000, fir, 9, 276, fwe44, SWR_DITHER_NS_F_WEIGHTED}, 204 {46000, fir, 9, 160, mew44, SWR_DITHER_NS_MODIFIED_E_WEIGHTED}, 205 {46000, fir, 9, 321, iew44, SWR_DITHER_NS_IMPROVED_E_WEIGHTED}, 206 // {48000, iir, 4, 220, ges48, SWR_DITHER_NS_GESEMANN}, 207 // {44100, iir, 4, 230, ges44, SWR_DITHER_NS_GESEMANN}, 208 {48000, fir, 16, 301, shi48, SWR_DITHER_NS_SHIBATA}, 209 {44100, fir, 20, 333, shi44, SWR_DITHER_NS_SHIBATA}, 210 {37800, fir, 16, 240, shi38, SWR_DITHER_NS_SHIBATA}, 211 {32000, fir, 20, 240/*TBD*/, shi32, SWR_DITHER_NS_SHIBATA}, 212 {22050, fir, 20, 240/*TBD*/, shi22, SWR_DITHER_NS_SHIBATA}, 213 {16000, fir, 20, 240/*TBD*/, shi16, SWR_DITHER_NS_SHIBATA}, 214 {11025, fir, 20, 240/*TBD*/, shi11, SWR_DITHER_NS_SHIBATA}, 215 { 8000, fir, 20, 240/*TBD*/, shi08, SWR_DITHER_NS_SHIBATA}, 216 {48000, fir, 16, 250, shl48, SWR_DITHER_NS_LOW_SHIBATA}, 217 {44100, fir, 15, 250, shl44, SWR_DITHER_NS_LOW_SHIBATA}, 218 {44100, fir, 20, 383, shh44, SWR_DITHER_NS_HIGH_SHIBATA}, 219 { 0, fir, 0, 0, NULL, SWR_DITHER_NONE}, 220 }; 221