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| 1 /* | |
| 2 * http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html | |
| 3 * Copyright Takuya OOURA, 1996-2001 | |
| 4 * | |
| 5 * You may use, copy, modify and distribute this code for any purpose (include | |
| 6 * commercial use) and without fee. Please refer to this package when you modify | |
| 7 * this code. | |
| 8 * | |
| 9 * Changes by the WebRTC authors: | |
| 10 * - Trivial type modifications. | |
| 11 * - Minimal code subset to do rdft of length 128. | |
| 12 * - Optimizations because of known length. | |
| 13 * | |
| 14 * All changes are covered by the WebRTC license and IP grant: | |
| 15 * Use of this source code is governed by a BSD-style license | |
| 16 * that can be found in the LICENSE file in the root of the source | |
| 17 * tree. An additional intellectual property rights grant can be found | |
| 18 * in the file PATENTS. All contributing project authors may | |
| 19 * be found in the AUTHORS file in the root of the source tree. | |
| 20 */ | |
| 21 | |
| 22 #include "webrtc/modules/audio_processing/aec/aec_rdft.h" | |
| 23 | |
| 24 #include <math.h> | |
| 25 | |
| 26 #include "webrtc/system_wrappers/include/cpu_features_wrapper.h" | |
| 27 #include "webrtc/typedefs.h" | |
| 28 | |
| 29 // These tables used to be computed at run-time. For example, refer to: | |
| 30 // https://code.google.com/p/webrtc/source/browse/trunk/webrtc/modules/audio_pro
cessing/aec/aec_rdft.c?r=6564 | |
| 31 // to see the initialization code. | |
| 32 const float rdft_w[64] = { | |
| 33 1.0000000000f, 0.0000000000f, 0.7071067691f, 0.7071067691f, | |
| 34 0.9238795638f, 0.3826834559f, 0.3826834559f, 0.9238795638f, | |
| 35 0.9807852507f, 0.1950903237f, 0.5555702448f, 0.8314695954f, | |
| 36 0.8314695954f, 0.5555702448f, 0.1950903237f, 0.9807852507f, | |
| 37 0.9951847196f, 0.0980171412f, 0.6343933344f, 0.7730104327f, | |
| 38 0.8819212914f, 0.4713967443f, 0.2902846634f, 0.9569403529f, | |
| 39 0.9569403529f, 0.2902846634f, 0.4713967443f, 0.8819212914f, | |
| 40 0.7730104327f, 0.6343933344f, 0.0980171412f, 0.9951847196f, | |
| 41 0.7071067691f, 0.4993977249f, 0.4975923598f, 0.4945882559f, | |
| 42 0.4903926253f, 0.4850156307f, 0.4784701765f, 0.4707720280f, | |
| 43 0.4619397819f, 0.4519946277f, 0.4409606457f, 0.4288643003f, | |
| 44 0.4157347977f, 0.4016037583f, 0.3865052164f, 0.3704755902f, | |
| 45 0.3535533845f, 0.3357794881f, 0.3171966672f, 0.2978496552f, | |
| 46 0.2777851224f, 0.2570513785f, 0.2356983721f, 0.2137775421f, | |
| 47 0.1913417280f, 0.1684449315f, 0.1451423317f, 0.1214900985f, | |
| 48 0.0975451618f, 0.0733652338f, 0.0490085706f, 0.0245338380f, | |
| 49 }; | |
| 50 const float rdft_wk3ri_first[16] = { | |
| 51 1.000000000f, 0.000000000f, 0.382683456f, 0.923879564f, | |
| 52 0.831469536f, 0.555570245f, -0.195090353f, 0.980785251f, | |
| 53 0.956940353f, 0.290284693f, 0.098017156f, 0.995184720f, | |
| 54 0.634393334f, 0.773010492f, -0.471396863f, 0.881921172f, | |
| 55 }; | |
| 56 const float rdft_wk3ri_second[16] = { | |
| 57 -0.707106769f, 0.707106769f, -0.923879564f, -0.382683456f, | |
| 58 -0.980785251f, 0.195090353f, -0.555570245f, -0.831469536f, | |
| 59 -0.881921172f, 0.471396863f, -0.773010492f, -0.634393334f, | |
| 60 -0.995184720f, -0.098017156f, -0.290284693f, -0.956940353f, | |
| 61 }; | |
| 62 ALIGN16_BEG const float ALIGN16_END rdft_wk1r[32] = { | |
| 63 1.000000000f, 1.000000000f, 0.707106769f, 0.707106769f, | |
| 64 0.923879564f, 0.923879564f, 0.382683456f, 0.382683456f, | |
| 65 0.980785251f, 0.980785251f, 0.555570245f, 0.555570245f, | |
| 66 0.831469595f, 0.831469595f, 0.195090324f, 0.195090324f, | |
| 67 0.995184720f, 0.995184720f, 0.634393334f, 0.634393334f, | |
| 68 0.881921291f, 0.881921291f, 0.290284663f, 0.290284663f, | |
| 69 0.956940353f, 0.956940353f, 0.471396744f, 0.471396744f, | |
| 70 0.773010433f, 0.773010433f, 0.098017141f, 0.098017141f, | |
| 71 }; | |
| 72 ALIGN16_BEG const float ALIGN16_END rdft_wk2r[32] = { | |
| 73 1.000000000f, 1.000000000f, -0.000000000f, -0.000000000f, | |
| 74 0.707106769f, 0.707106769f, -0.707106769f, -0.707106769f, | |
| 75 0.923879564f, 0.923879564f, -0.382683456f, -0.382683456f, | |
| 76 0.382683456f, 0.382683456f, -0.923879564f, -0.923879564f, | |
| 77 0.980785251f, 0.980785251f, -0.195090324f, -0.195090324f, | |
| 78 0.555570245f, 0.555570245f, -0.831469595f, -0.831469595f, | |
| 79 0.831469595f, 0.831469595f, -0.555570245f, -0.555570245f, | |
| 80 0.195090324f, 0.195090324f, -0.980785251f, -0.980785251f, | |
| 81 }; | |
| 82 ALIGN16_BEG const float ALIGN16_END rdft_wk3r[32] = { | |
| 83 1.000000000f, 1.000000000f, -0.707106769f, -0.707106769f, | |
| 84 0.382683456f, 0.382683456f, -0.923879564f, -0.923879564f, | |
| 85 0.831469536f, 0.831469536f, -0.980785251f, -0.980785251f, | |
| 86 -0.195090353f, -0.195090353f, -0.555570245f, -0.555570245f, | |
| 87 0.956940353f, 0.956940353f, -0.881921172f, -0.881921172f, | |
| 88 0.098017156f, 0.098017156f, -0.773010492f, -0.773010492f, | |
| 89 0.634393334f, 0.634393334f, -0.995184720f, -0.995184720f, | |
| 90 -0.471396863f, -0.471396863f, -0.290284693f, -0.290284693f, | |
| 91 }; | |
| 92 ALIGN16_BEG const float ALIGN16_END rdft_wk1i[32] = { | |
| 93 -0.000000000f, 0.000000000f, -0.707106769f, 0.707106769f, | |
| 94 -0.382683456f, 0.382683456f, -0.923879564f, 0.923879564f, | |
| 95 -0.195090324f, 0.195090324f, -0.831469595f, 0.831469595f, | |
| 96 -0.555570245f, 0.555570245f, -0.980785251f, 0.980785251f, | |
| 97 -0.098017141f, 0.098017141f, -0.773010433f, 0.773010433f, | |
| 98 -0.471396744f, 0.471396744f, -0.956940353f, 0.956940353f, | |
| 99 -0.290284663f, 0.290284663f, -0.881921291f, 0.881921291f, | |
| 100 -0.634393334f, 0.634393334f, -0.995184720f, 0.995184720f, | |
| 101 }; | |
| 102 ALIGN16_BEG const float ALIGN16_END rdft_wk2i[32] = { | |
| 103 -0.000000000f, 0.000000000f, -1.000000000f, 1.000000000f, | |
| 104 -0.707106769f, 0.707106769f, -0.707106769f, 0.707106769f, | |
| 105 -0.382683456f, 0.382683456f, -0.923879564f, 0.923879564f, | |
| 106 -0.923879564f, 0.923879564f, -0.382683456f, 0.382683456f, | |
| 107 -0.195090324f, 0.195090324f, -0.980785251f, 0.980785251f, | |
| 108 -0.831469595f, 0.831469595f, -0.555570245f, 0.555570245f, | |
| 109 -0.555570245f, 0.555570245f, -0.831469595f, 0.831469595f, | |
| 110 -0.980785251f, 0.980785251f, -0.195090324f, 0.195090324f, | |
| 111 }; | |
| 112 ALIGN16_BEG const float ALIGN16_END rdft_wk3i[32] = { | |
| 113 -0.000000000f, 0.000000000f, -0.707106769f, 0.707106769f, | |
| 114 -0.923879564f, 0.923879564f, 0.382683456f, -0.382683456f, | |
| 115 -0.555570245f, 0.555570245f, -0.195090353f, 0.195090353f, | |
| 116 -0.980785251f, 0.980785251f, 0.831469536f, -0.831469536f, | |
| 117 -0.290284693f, 0.290284693f, -0.471396863f, 0.471396863f, | |
| 118 -0.995184720f, 0.995184720f, 0.634393334f, -0.634393334f, | |
| 119 -0.773010492f, 0.773010492f, 0.098017156f, -0.098017156f, | |
| 120 -0.881921172f, 0.881921172f, 0.956940353f, -0.956940353f, | |
| 121 }; | |
| 122 ALIGN16_BEG const float ALIGN16_END cftmdl_wk1r[4] = { | |
| 123 0.707106769f, 0.707106769f, 0.707106769f, -0.707106769f, | |
| 124 }; | |
| 125 | |
| 126 static void bitrv2_128_C(float* a) { | |
| 127 /* | |
| 128 Following things have been attempted but are no faster: | |
| 129 (a) Storing the swap indexes in a LUT (index calculations are done | |
| 130 for 'free' while waiting on memory/L1). | |
| 131 (b) Consolidate the load/store of two consecutive floats by a 64 bit | |
| 132 integer (execution is memory/L1 bound). | |
| 133 (c) Do a mix of floats and 64 bit integer to maximize register | |
| 134 utilization (execution is memory/L1 bound). | |
| 135 (d) Replacing ip[i] by ((k<<31)>>25) + ((k >> 1)<<5). | |
| 136 (e) Hard-coding of the offsets to completely eliminates index | |
| 137 calculations. | |
| 138 */ | |
| 139 | |
| 140 unsigned int j, j1, k, k1; | |
| 141 float xr, xi, yr, yi; | |
| 142 | |
| 143 static const int ip[4] = {0, 64, 32, 96}; | |
| 144 for (k = 0; k < 4; k++) { | |
| 145 for (j = 0; j < k; j++) { | |
| 146 j1 = 2 * j + ip[k]; | |
| 147 k1 = 2 * k + ip[j]; | |
| 148 xr = a[j1 + 0]; | |
| 149 xi = a[j1 + 1]; | |
| 150 yr = a[k1 + 0]; | |
| 151 yi = a[k1 + 1]; | |
| 152 a[j1 + 0] = yr; | |
| 153 a[j1 + 1] = yi; | |
| 154 a[k1 + 0] = xr; | |
| 155 a[k1 + 1] = xi; | |
| 156 j1 += 8; | |
| 157 k1 += 16; | |
| 158 xr = a[j1 + 0]; | |
| 159 xi = a[j1 + 1]; | |
| 160 yr = a[k1 + 0]; | |
| 161 yi = a[k1 + 1]; | |
| 162 a[j1 + 0] = yr; | |
| 163 a[j1 + 1] = yi; | |
| 164 a[k1 + 0] = xr; | |
| 165 a[k1 + 1] = xi; | |
| 166 j1 += 8; | |
| 167 k1 -= 8; | |
| 168 xr = a[j1 + 0]; | |
| 169 xi = a[j1 + 1]; | |
| 170 yr = a[k1 + 0]; | |
| 171 yi = a[k1 + 1]; | |
| 172 a[j1 + 0] = yr; | |
| 173 a[j1 + 1] = yi; | |
| 174 a[k1 + 0] = xr; | |
| 175 a[k1 + 1] = xi; | |
| 176 j1 += 8; | |
| 177 k1 += 16; | |
| 178 xr = a[j1 + 0]; | |
| 179 xi = a[j1 + 1]; | |
| 180 yr = a[k1 + 0]; | |
| 181 yi = a[k1 + 1]; | |
| 182 a[j1 + 0] = yr; | |
| 183 a[j1 + 1] = yi; | |
| 184 a[k1 + 0] = xr; | |
| 185 a[k1 + 1] = xi; | |
| 186 } | |
| 187 j1 = 2 * k + 8 + ip[k]; | |
| 188 k1 = j1 + 8; | |
| 189 xr = a[j1 + 0]; | |
| 190 xi = a[j1 + 1]; | |
| 191 yr = a[k1 + 0]; | |
| 192 yi = a[k1 + 1]; | |
| 193 a[j1 + 0] = yr; | |
| 194 a[j1 + 1] = yi; | |
| 195 a[k1 + 0] = xr; | |
| 196 a[k1 + 1] = xi; | |
| 197 } | |
| 198 } | |
| 199 | |
| 200 static void cft1st_128_C(float* a) { | |
| 201 const int n = 128; | |
| 202 int j, k1, k2; | |
| 203 float wk1r, wk1i, wk2r, wk2i, wk3r, wk3i; | |
| 204 float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i; | |
| 205 | |
| 206 // The processing of the first set of elements was simplified in C to avoid | |
| 207 // some operations (multiplication by zero or one, addition of two elements | |
| 208 // multiplied by the same weight, ...). | |
| 209 x0r = a[0] + a[2]; | |
| 210 x0i = a[1] + a[3]; | |
| 211 x1r = a[0] - a[2]; | |
| 212 x1i = a[1] - a[3]; | |
| 213 x2r = a[4] + a[6]; | |
| 214 x2i = a[5] + a[7]; | |
| 215 x3r = a[4] - a[6]; | |
| 216 x3i = a[5] - a[7]; | |
| 217 a[0] = x0r + x2r; | |
| 218 a[1] = x0i + x2i; | |
| 219 a[4] = x0r - x2r; | |
| 220 a[5] = x0i - x2i; | |
| 221 a[2] = x1r - x3i; | |
| 222 a[3] = x1i + x3r; | |
| 223 a[6] = x1r + x3i; | |
| 224 a[7] = x1i - x3r; | |
| 225 wk1r = rdft_w[2]; | |
| 226 x0r = a[8] + a[10]; | |
| 227 x0i = a[9] + a[11]; | |
| 228 x1r = a[8] - a[10]; | |
| 229 x1i = a[9] - a[11]; | |
| 230 x2r = a[12] + a[14]; | |
| 231 x2i = a[13] + a[15]; | |
| 232 x3r = a[12] - a[14]; | |
| 233 x3i = a[13] - a[15]; | |
| 234 a[8] = x0r + x2r; | |
| 235 a[9] = x0i + x2i; | |
| 236 a[12] = x2i - x0i; | |
| 237 a[13] = x0r - x2r; | |
| 238 x0r = x1r - x3i; | |
| 239 x0i = x1i + x3r; | |
| 240 a[10] = wk1r * (x0r - x0i); | |
| 241 a[11] = wk1r * (x0r + x0i); | |
| 242 x0r = x3i + x1r; | |
| 243 x0i = x3r - x1i; | |
| 244 a[14] = wk1r * (x0i - x0r); | |
| 245 a[15] = wk1r * (x0i + x0r); | |
| 246 k1 = 0; | |
| 247 for (j = 16; j < n; j += 16) { | |
| 248 k1 += 2; | |
| 249 k2 = 2 * k1; | |
| 250 wk2r = rdft_w[k1 + 0]; | |
| 251 wk2i = rdft_w[k1 + 1]; | |
| 252 wk1r = rdft_w[k2 + 0]; | |
| 253 wk1i = rdft_w[k2 + 1]; | |
| 254 wk3r = rdft_wk3ri_first[k1 + 0]; | |
| 255 wk3i = rdft_wk3ri_first[k1 + 1]; | |
| 256 x0r = a[j + 0] + a[j + 2]; | |
| 257 x0i = a[j + 1] + a[j + 3]; | |
| 258 x1r = a[j + 0] - a[j + 2]; | |
| 259 x1i = a[j + 1] - a[j + 3]; | |
| 260 x2r = a[j + 4] + a[j + 6]; | |
| 261 x2i = a[j + 5] + a[j + 7]; | |
| 262 x3r = a[j + 4] - a[j + 6]; | |
| 263 x3i = a[j + 5] - a[j + 7]; | |
| 264 a[j + 0] = x0r + x2r; | |
| 265 a[j + 1] = x0i + x2i; | |
| 266 x0r -= x2r; | |
| 267 x0i -= x2i; | |
| 268 a[j + 4] = wk2r * x0r - wk2i * x0i; | |
| 269 a[j + 5] = wk2r * x0i + wk2i * x0r; | |
| 270 x0r = x1r - x3i; | |
| 271 x0i = x1i + x3r; | |
| 272 a[j + 2] = wk1r * x0r - wk1i * x0i; | |
| 273 a[j + 3] = wk1r * x0i + wk1i * x0r; | |
| 274 x0r = x1r + x3i; | |
| 275 x0i = x1i - x3r; | |
| 276 a[j + 6] = wk3r * x0r - wk3i * x0i; | |
| 277 a[j + 7] = wk3r * x0i + wk3i * x0r; | |
| 278 wk1r = rdft_w[k2 + 2]; | |
| 279 wk1i = rdft_w[k2 + 3]; | |
| 280 wk3r = rdft_wk3ri_second[k1 + 0]; | |
| 281 wk3i = rdft_wk3ri_second[k1 + 1]; | |
| 282 x0r = a[j + 8] + a[j + 10]; | |
| 283 x0i = a[j + 9] + a[j + 11]; | |
| 284 x1r = a[j + 8] - a[j + 10]; | |
| 285 x1i = a[j + 9] - a[j + 11]; | |
| 286 x2r = a[j + 12] + a[j + 14]; | |
| 287 x2i = a[j + 13] + a[j + 15]; | |
| 288 x3r = a[j + 12] - a[j + 14]; | |
| 289 x3i = a[j + 13] - a[j + 15]; | |
| 290 a[j + 8] = x0r + x2r; | |
| 291 a[j + 9] = x0i + x2i; | |
| 292 x0r -= x2r; | |
| 293 x0i -= x2i; | |
| 294 a[j + 12] = -wk2i * x0r - wk2r * x0i; | |
| 295 a[j + 13] = -wk2i * x0i + wk2r * x0r; | |
| 296 x0r = x1r - x3i; | |
| 297 x0i = x1i + x3r; | |
| 298 a[j + 10] = wk1r * x0r - wk1i * x0i; | |
| 299 a[j + 11] = wk1r * x0i + wk1i * x0r; | |
| 300 x0r = x1r + x3i; | |
| 301 x0i = x1i - x3r; | |
| 302 a[j + 14] = wk3r * x0r - wk3i * x0i; | |
| 303 a[j + 15] = wk3r * x0i + wk3i * x0r; | |
| 304 } | |
| 305 } | |
| 306 | |
| 307 static void cftmdl_128_C(float* a) { | |
| 308 const int l = 8; | |
| 309 const int n = 128; | |
| 310 const int m = 32; | |
| 311 int j0, j1, j2, j3, k, k1, k2, m2; | |
| 312 float wk1r, wk1i, wk2r, wk2i, wk3r, wk3i; | |
| 313 float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i; | |
| 314 | |
| 315 for (j0 = 0; j0 < l; j0 += 2) { | |
| 316 j1 = j0 + 8; | |
| 317 j2 = j0 + 16; | |
| 318 j3 = j0 + 24; | |
| 319 x0r = a[j0 + 0] + a[j1 + 0]; | |
| 320 x0i = a[j0 + 1] + a[j1 + 1]; | |
| 321 x1r = a[j0 + 0] - a[j1 + 0]; | |
| 322 x1i = a[j0 + 1] - a[j1 + 1]; | |
| 323 x2r = a[j2 + 0] + a[j3 + 0]; | |
| 324 x2i = a[j2 + 1] + a[j3 + 1]; | |
| 325 x3r = a[j2 + 0] - a[j3 + 0]; | |
| 326 x3i = a[j2 + 1] - a[j3 + 1]; | |
| 327 a[j0 + 0] = x0r + x2r; | |
| 328 a[j0 + 1] = x0i + x2i; | |
| 329 a[j2 + 0] = x0r - x2r; | |
| 330 a[j2 + 1] = x0i - x2i; | |
| 331 a[j1 + 0] = x1r - x3i; | |
| 332 a[j1 + 1] = x1i + x3r; | |
| 333 a[j3 + 0] = x1r + x3i; | |
| 334 a[j3 + 1] = x1i - x3r; | |
| 335 } | |
| 336 wk1r = rdft_w[2]; | |
| 337 for (j0 = m; j0 < l + m; j0 += 2) { | |
| 338 j1 = j0 + 8; | |
| 339 j2 = j0 + 16; | |
| 340 j3 = j0 + 24; | |
| 341 x0r = a[j0 + 0] + a[j1 + 0]; | |
| 342 x0i = a[j0 + 1] + a[j1 + 1]; | |
| 343 x1r = a[j0 + 0] - a[j1 + 0]; | |
| 344 x1i = a[j0 + 1] - a[j1 + 1]; | |
| 345 x2r = a[j2 + 0] + a[j3 + 0]; | |
| 346 x2i = a[j2 + 1] + a[j3 + 1]; | |
| 347 x3r = a[j2 + 0] - a[j3 + 0]; | |
| 348 x3i = a[j2 + 1] - a[j3 + 1]; | |
| 349 a[j0 + 0] = x0r + x2r; | |
| 350 a[j0 + 1] = x0i + x2i; | |
| 351 a[j2 + 0] = x2i - x0i; | |
| 352 a[j2 + 1] = x0r - x2r; | |
| 353 x0r = x1r - x3i; | |
| 354 x0i = x1i + x3r; | |
| 355 a[j1 + 0] = wk1r * (x0r - x0i); | |
| 356 a[j1 + 1] = wk1r * (x0r + x0i); | |
| 357 x0r = x3i + x1r; | |
| 358 x0i = x3r - x1i; | |
| 359 a[j3 + 0] = wk1r * (x0i - x0r); | |
| 360 a[j3 + 1] = wk1r * (x0i + x0r); | |
| 361 } | |
| 362 k1 = 0; | |
| 363 m2 = 2 * m; | |
| 364 for (k = m2; k < n; k += m2) { | |
| 365 k1 += 2; | |
| 366 k2 = 2 * k1; | |
| 367 wk2r = rdft_w[k1 + 0]; | |
| 368 wk2i = rdft_w[k1 + 1]; | |
| 369 wk1r = rdft_w[k2 + 0]; | |
| 370 wk1i = rdft_w[k2 + 1]; | |
| 371 wk3r = rdft_wk3ri_first[k1 + 0]; | |
| 372 wk3i = rdft_wk3ri_first[k1 + 1]; | |
| 373 for (j0 = k; j0 < l + k; j0 += 2) { | |
| 374 j1 = j0 + 8; | |
| 375 j2 = j0 + 16; | |
| 376 j3 = j0 + 24; | |
| 377 x0r = a[j0 + 0] + a[j1 + 0]; | |
| 378 x0i = a[j0 + 1] + a[j1 + 1]; | |
| 379 x1r = a[j0 + 0] - a[j1 + 0]; | |
| 380 x1i = a[j0 + 1] - a[j1 + 1]; | |
| 381 x2r = a[j2 + 0] + a[j3 + 0]; | |
| 382 x2i = a[j2 + 1] + a[j3 + 1]; | |
| 383 x3r = a[j2 + 0] - a[j3 + 0]; | |
| 384 x3i = a[j2 + 1] - a[j3 + 1]; | |
| 385 a[j0 + 0] = x0r + x2r; | |
| 386 a[j0 + 1] = x0i + x2i; | |
| 387 x0r -= x2r; | |
| 388 x0i -= x2i; | |
| 389 a[j2 + 0] = wk2r * x0r - wk2i * x0i; | |
| 390 a[j2 + 1] = wk2r * x0i + wk2i * x0r; | |
| 391 x0r = x1r - x3i; | |
| 392 x0i = x1i + x3r; | |
| 393 a[j1 + 0] = wk1r * x0r - wk1i * x0i; | |
| 394 a[j1 + 1] = wk1r * x0i + wk1i * x0r; | |
| 395 x0r = x1r + x3i; | |
| 396 x0i = x1i - x3r; | |
| 397 a[j3 + 0] = wk3r * x0r - wk3i * x0i; | |
| 398 a[j3 + 1] = wk3r * x0i + wk3i * x0r; | |
| 399 } | |
| 400 wk1r = rdft_w[k2 + 2]; | |
| 401 wk1i = rdft_w[k2 + 3]; | |
| 402 wk3r = rdft_wk3ri_second[k1 + 0]; | |
| 403 wk3i = rdft_wk3ri_second[k1 + 1]; | |
| 404 for (j0 = k + m; j0 < l + (k + m); j0 += 2) { | |
| 405 j1 = j0 + 8; | |
| 406 j2 = j0 + 16; | |
| 407 j3 = j0 + 24; | |
| 408 x0r = a[j0 + 0] + a[j1 + 0]; | |
| 409 x0i = a[j0 + 1] + a[j1 + 1]; | |
| 410 x1r = a[j0 + 0] - a[j1 + 0]; | |
| 411 x1i = a[j0 + 1] - a[j1 + 1]; | |
| 412 x2r = a[j2 + 0] + a[j3 + 0]; | |
| 413 x2i = a[j2 + 1] + a[j3 + 1]; | |
| 414 x3r = a[j2 + 0] - a[j3 + 0]; | |
| 415 x3i = a[j2 + 1] - a[j3 + 1]; | |
| 416 a[j0 + 0] = x0r + x2r; | |
| 417 a[j0 + 1] = x0i + x2i; | |
| 418 x0r -= x2r; | |
| 419 x0i -= x2i; | |
| 420 a[j2 + 0] = -wk2i * x0r - wk2r * x0i; | |
| 421 a[j2 + 1] = -wk2i * x0i + wk2r * x0r; | |
| 422 x0r = x1r - x3i; | |
| 423 x0i = x1i + x3r; | |
| 424 a[j1 + 0] = wk1r * x0r - wk1i * x0i; | |
| 425 a[j1 + 1] = wk1r * x0i + wk1i * x0r; | |
| 426 x0r = x1r + x3i; | |
| 427 x0i = x1i - x3r; | |
| 428 a[j3 + 0] = wk3r * x0r - wk3i * x0i; | |
| 429 a[j3 + 1] = wk3r * x0i + wk3i * x0r; | |
| 430 } | |
| 431 } | |
| 432 } | |
| 433 | |
| 434 static void cftfsub_128_C(float* a) { | |
| 435 int j, j1, j2, j3, l; | |
| 436 float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i; | |
| 437 | |
| 438 cft1st_128(a); | |
| 439 cftmdl_128(a); | |
| 440 l = 32; | |
| 441 for (j = 0; j < l; j += 2) { | |
| 442 j1 = j + l; | |
| 443 j2 = j1 + l; | |
| 444 j3 = j2 + l; | |
| 445 x0r = a[j] + a[j1]; | |
| 446 x0i = a[j + 1] + a[j1 + 1]; | |
| 447 x1r = a[j] - a[j1]; | |
| 448 x1i = a[j + 1] - a[j1 + 1]; | |
| 449 x2r = a[j2] + a[j3]; | |
| 450 x2i = a[j2 + 1] + a[j3 + 1]; | |
| 451 x3r = a[j2] - a[j3]; | |
| 452 x3i = a[j2 + 1] - a[j3 + 1]; | |
| 453 a[j] = x0r + x2r; | |
| 454 a[j + 1] = x0i + x2i; | |
| 455 a[j2] = x0r - x2r; | |
| 456 a[j2 + 1] = x0i - x2i; | |
| 457 a[j1] = x1r - x3i; | |
| 458 a[j1 + 1] = x1i + x3r; | |
| 459 a[j3] = x1r + x3i; | |
| 460 a[j3 + 1] = x1i - x3r; | |
| 461 } | |
| 462 } | |
| 463 | |
| 464 static void cftbsub_128_C(float* a) { | |
| 465 int j, j1, j2, j3, l; | |
| 466 float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i; | |
| 467 | |
| 468 cft1st_128(a); | |
| 469 cftmdl_128(a); | |
| 470 l = 32; | |
| 471 | |
| 472 for (j = 0; j < l; j += 2) { | |
| 473 j1 = j + l; | |
| 474 j2 = j1 + l; | |
| 475 j3 = j2 + l; | |
| 476 x0r = a[j] + a[j1]; | |
| 477 x0i = -a[j + 1] - a[j1 + 1]; | |
| 478 x1r = a[j] - a[j1]; | |
| 479 x1i = -a[j + 1] + a[j1 + 1]; | |
| 480 x2r = a[j2] + a[j3]; | |
| 481 x2i = a[j2 + 1] + a[j3 + 1]; | |
| 482 x3r = a[j2] - a[j3]; | |
| 483 x3i = a[j2 + 1] - a[j3 + 1]; | |
| 484 a[j] = x0r + x2r; | |
| 485 a[j + 1] = x0i - x2i; | |
| 486 a[j2] = x0r - x2r; | |
| 487 a[j2 + 1] = x0i + x2i; | |
| 488 a[j1] = x1r - x3i; | |
| 489 a[j1 + 1] = x1i - x3r; | |
| 490 a[j3] = x1r + x3i; | |
| 491 a[j3 + 1] = x1i + x3r; | |
| 492 } | |
| 493 } | |
| 494 | |
| 495 static void rftfsub_128_C(float* a) { | |
| 496 const float* c = rdft_w + 32; | |
| 497 int j1, j2, k1, k2; | |
| 498 float wkr, wki, xr, xi, yr, yi; | |
| 499 | |
| 500 for (j1 = 1, j2 = 2; j2 < 64; j1 += 1, j2 += 2) { | |
| 501 k2 = 128 - j2; | |
| 502 k1 = 32 - j1; | |
| 503 wkr = 0.5f - c[k1]; | |
| 504 wki = c[j1]; | |
| 505 xr = a[j2 + 0] - a[k2 + 0]; | |
| 506 xi = a[j2 + 1] + a[k2 + 1]; | |
| 507 yr = wkr * xr - wki * xi; | |
| 508 yi = wkr * xi + wki * xr; | |
| 509 a[j2 + 0] -= yr; | |
| 510 a[j2 + 1] -= yi; | |
| 511 a[k2 + 0] += yr; | |
| 512 a[k2 + 1] -= yi; | |
| 513 } | |
| 514 } | |
| 515 | |
| 516 static void rftbsub_128_C(float* a) { | |
| 517 const float* c = rdft_w + 32; | |
| 518 int j1, j2, k1, k2; | |
| 519 float wkr, wki, xr, xi, yr, yi; | |
| 520 | |
| 521 a[1] = -a[1]; | |
| 522 for (j1 = 1, j2 = 2; j2 < 64; j1 += 1, j2 += 2) { | |
| 523 k2 = 128 - j2; | |
| 524 k1 = 32 - j1; | |
| 525 wkr = 0.5f - c[k1]; | |
| 526 wki = c[j1]; | |
| 527 xr = a[j2 + 0] - a[k2 + 0]; | |
| 528 xi = a[j2 + 1] + a[k2 + 1]; | |
| 529 yr = wkr * xr + wki * xi; | |
| 530 yi = wkr * xi - wki * xr; | |
| 531 a[j2 + 0] = a[j2 + 0] - yr; | |
| 532 a[j2 + 1] = yi - a[j2 + 1]; | |
| 533 a[k2 + 0] = yr + a[k2 + 0]; | |
| 534 a[k2 + 1] = yi - a[k2 + 1]; | |
| 535 } | |
| 536 a[65] = -a[65]; | |
| 537 } | |
| 538 | |
| 539 void aec_rdft_forward_128(float* a) { | |
| 540 float xi; | |
| 541 bitrv2_128(a); | |
| 542 cftfsub_128(a); | |
| 543 rftfsub_128(a); | |
| 544 xi = a[0] - a[1]; | |
| 545 a[0] += a[1]; | |
| 546 a[1] = xi; | |
| 547 } | |
| 548 | |
| 549 void aec_rdft_inverse_128(float* a) { | |
| 550 a[1] = 0.5f * (a[0] - a[1]); | |
| 551 a[0] -= a[1]; | |
| 552 rftbsub_128(a); | |
| 553 bitrv2_128(a); | |
| 554 cftbsub_128(a); | |
| 555 } | |
| 556 | |
| 557 // code path selection | |
| 558 RftSub128 cft1st_128; | |
| 559 RftSub128 cftmdl_128; | |
| 560 RftSub128 rftfsub_128; | |
| 561 RftSub128 rftbsub_128; | |
| 562 RftSub128 cftfsub_128; | |
| 563 RftSub128 cftbsub_128; | |
| 564 RftSub128 bitrv2_128; | |
| 565 | |
| 566 void aec_rdft_init(void) { | |
| 567 cft1st_128 = cft1st_128_C; | |
| 568 cftmdl_128 = cftmdl_128_C; | |
| 569 rftfsub_128 = rftfsub_128_C; | |
| 570 rftbsub_128 = rftbsub_128_C; | |
| 571 cftfsub_128 = cftfsub_128_C; | |
| 572 cftbsub_128 = cftbsub_128_C; | |
| 573 bitrv2_128 = bitrv2_128_C; | |
| 574 #if defined(WEBRTC_ARCH_X86_FAMILY) | |
| 575 if (WebRtc_GetCPUInfo(kSSE2)) { | |
| 576 aec_rdft_init_sse2(); | |
| 577 } | |
| 578 #endif | |
| 579 #if defined(MIPS_FPU_LE) | |
| 580 aec_rdft_init_mips(); | |
| 581 #endif | |
| 582 #if defined(WEBRTC_HAS_NEON) | |
| 583 aec_rdft_init_neon(); | |
| 584 #elif defined(WEBRTC_DETECT_NEON) | |
| 585 if ((WebRtc_GetCPUFeaturesARM() & kCPUFeatureNEON) != 0) { | |
| 586 aec_rdft_init_neon(); | |
| 587 } | |
| 588 #endif | |
| 589 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1881153003:
Moved the aec_rdft*.c files to be built using C++ (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master