1 /****************************************************************************** 2 * * 3 * Copyright (C) 2018 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ***************************************************************************** 18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore 19 */ 20 #include <string.h> 21 #include <ixheaacd_type_def.h> 22 23 #include "ixheaacd_constants.h" 24 25 #include <ixheaacd_basic_ops32.h> 26 #include "ixheaacd_windows.h" 27 28 static PLATFORM_INLINE WORD32 ixheaacd_mult32_sh1(WORD32 a, WORD32 b) { 29 WORD32 result; 30 WORD64 temp_result; 31 32 temp_result = (WORD64)a * (WORD64)b; 33 result = (WORD32)(temp_result >> 31); 34 35 return (result); 36 } 37 38 VOID ixheaacd_memset(FLOAT32 *x, WORD32 n) { 39 memset(x, 0, n * sizeof(FLOAT32)); 40 return; 41 } 42 43 VOID ixheaacd_mem_cpy(const FLOAT32 x[], FLOAT32 y[], WORD32 n) { 44 memcpy(y, x, n * sizeof(FLOAT32)); 45 return; 46 } 47 48 VOID ixheaacd_vec_cnst_mul(FLOAT32 a, FLOAT32 x[], FLOAT32 z[], WORD32 n) { 49 WORD32 i; 50 for (i = 0; i < n; i++) { 51 z[i] = (FLOAT32)a * x[i]; 52 } 53 return; 54 } 55 56 VOID ixheaacd_combine_fac(WORD32 *src1, WORD32 *src2, WORD32 *dest, WORD32 len, 57 WORD8 output_q, WORD8 fac_q) { 58 WORD32 i; 59 if (fac_q > output_q) { 60 for (i = 0; i < len; i++) { 61 *dest = ixheaacd_add32_sat(*src1, ((*src2) >> (fac_q - output_q))); 62 dest++; 63 src1++; 64 src2++; 65 } 66 } else { 67 for (i = 0; i < len; i++) { 68 *dest = ixheaacd_add32_sat(*src1, ((*src2) << (output_q - fac_q))); 69 dest++; 70 src1++; 71 src2++; 72 } 73 } 74 } 75 76 WORD8 ixheaacd_windowing_long1(WORD32 *src1, WORD32 *src2, 77 const WORD32 *win_fwd, const WORD32 *win_rev, 78 WORD32 *dest, WORD32 vlen, WORD8 shift1, 79 WORD8 shift2) { 80 WORD32 i; 81 WORD32 *rsrc2 = src2 + vlen - 1; 82 83 if (shift1 > shift2) { 84 for (i = 0; i < vlen / 2; i++) { 85 *dest = ixheaacd_add32_sat( 86 ((ixheaacd_mult32_sh1(*src1, *win_fwd)) >> (shift1 - shift2)), 87 ixheaacd_mult32_sh1(*src2, *win_rev)); 88 *(dest + (vlen - (2 * i)) - 1) = ixheaacd_add32_sat( 89 ((ixheaacd_mult32_sh1(-(*src1), *win_rev)) >> (shift1 - shift2)), 90 ixheaacd_mult32_sh1(*rsrc2, *win_fwd)); 91 92 src1++; 93 src2++; 94 win_fwd++; 95 win_rev--; 96 rsrc2--; 97 dest++; 98 } 99 return (shift2); 100 } else { 101 for (i = 0; i < vlen / 2; i++) { 102 *dest = ixheaacd_add32_sat( 103 ixheaacd_mult32_sh1(*src1, *win_fwd), 104 ((ixheaacd_mult32_sh1(*src2, *win_rev)) >> (shift2 - shift1))); 105 106 *(dest + (vlen - (2 * i)) - 1) = ixheaacd_add32_sat( 107 ixheaacd_mult32_sh1(-(*src1), *win_rev), 108 ((ixheaacd_mult32_sh1(*rsrc2, *win_fwd)) >> (shift2 - shift1))); 109 src1++; 110 src2++; 111 win_fwd++; 112 win_rev--; 113 rsrc2--; 114 dest++; 115 } 116 return (shift1); 117 } 118 } 119 120 WORD8 ixheaacd_windowing_long2(WORD32 *src1, const WORD32 *win_fwd, 121 WORD32 *fac_data_out, WORD32 *over_lap, 122 WORD32 *p_out_buffer, 123 offset_lengths *ixheaacd_drc_offset, 124 WORD8 shiftp, WORD8 shift_olap, WORD8 fac_q) { 125 WORD32 i; 126 WORD32 *dest = p_out_buffer; 127 128 win_fwd += ixheaacd_drc_offset->lfac; 129 130 if (shiftp > fac_q) { 131 if (shift_olap > fac_q) { 132 for (i = 0; 133 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 134 i++) { 135 dest[i] = over_lap[i] >> (shift_olap - fac_q); 136 } 137 138 for (i = ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 139 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_trans_ls; 140 i++) { 141 dest[i] = ixheaacd_add32_sat( 142 (ixheaacd_mult32_sh1(-src1[ixheaacd_drc_offset->n_long / 2 + 143 ixheaacd_drc_offset->n_flat_ls + 144 ixheaacd_drc_offset->lfac - i - 1], 145 *win_fwd) >> 146 (shiftp - fac_q)), 147 (*fac_data_out)); 148 win_fwd++; 149 fac_data_out++; 150 } 151 152 for (; 153 i < ixheaacd_drc_offset->n_flat_ls + (ixheaacd_drc_offset->lfac * 3); 154 i++) { 155 dest[i] = 156 ixheaacd_add32_sat((-src1[ixheaacd_drc_offset->n_long / 2 + 157 ixheaacd_drc_offset->n_flat_ls + 158 ixheaacd_drc_offset->lfac - i - 1] >> 159 (shiftp - fac_q)), 160 (*fac_data_out)); 161 fac_data_out++; 162 } 163 164 for (; i < ixheaacd_drc_offset->n_long; i++) { 165 dest[i] = -src1[ixheaacd_drc_offset->n_long / 2 + 166 ixheaacd_drc_offset->n_flat_ls + 167 ixheaacd_drc_offset->lfac - i - 1] >> 168 (shiftp - fac_q); 169 } 170 return (fac_q); 171 } else { 172 memcpy(dest, over_lap, sizeof(WORD32) * (ixheaacd_drc_offset->n_flat_ls + 173 ixheaacd_drc_offset->lfac)); 174 175 for (i = ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 176 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_trans_ls; 177 i++) { 178 dest[i] = ixheaacd_add32_sat( 179 (ixheaacd_mult32_sh1(-src1[ixheaacd_drc_offset->n_long / 2 + 180 ixheaacd_drc_offset->n_flat_ls + 181 ixheaacd_drc_offset->lfac - i - 1], 182 *win_fwd) >> 183 (shiftp - shift_olap)), 184 (*fac_data_out) >> (fac_q - shift_olap)); 185 win_fwd++; 186 fac_data_out++; 187 } 188 189 for (; 190 i < ixheaacd_drc_offset->n_flat_ls + (ixheaacd_drc_offset->lfac * 3); 191 i++) { 192 dest[i] = 193 ixheaacd_add32_sat((-src1[ixheaacd_drc_offset->n_long / 2 + 194 ixheaacd_drc_offset->n_flat_ls + 195 ixheaacd_drc_offset->lfac - i - 1] >> 196 (shiftp - shift_olap)), 197 (*fac_data_out) >> (fac_q - shift_olap)); 198 fac_data_out++; 199 } 200 201 for (; i < ixheaacd_drc_offset->n_long; i++) { 202 dest[i] = -src1[ixheaacd_drc_offset->n_long / 2 + 203 ixheaacd_drc_offset->n_flat_ls + 204 ixheaacd_drc_offset->lfac - i - 1] >> 205 (shiftp - shift_olap); 206 } 207 return (shift_olap); 208 } 209 } else { 210 if (shift_olap > shiftp) { 211 for (i = 0; 212 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 213 i++) { 214 dest[i] = over_lap[i] >> (shift_olap - shiftp); 215 } 216 217 for (i = ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 218 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_trans_ls; 219 i++) { 220 dest[i] = ixheaacd_add32_sat( 221 ixheaacd_mult32_sh1(-src1[ixheaacd_drc_offset->n_long / 2 + 222 ixheaacd_drc_offset->n_flat_ls + 223 ixheaacd_drc_offset->lfac - i - 1], 224 *win_fwd), 225 (*fac_data_out) >> (fac_q - shiftp)); 226 win_fwd++; 227 fac_data_out++; 228 } 229 230 for (; 231 i < ixheaacd_drc_offset->n_flat_ls + (ixheaacd_drc_offset->lfac * 3); 232 i++) { 233 dest[i] = ixheaacd_add32_sat(-src1[ixheaacd_drc_offset->n_long / 2 + 234 ixheaacd_drc_offset->n_flat_ls + 235 ixheaacd_drc_offset->lfac - i - 1], 236 (*fac_data_out) >> (fac_q - shiftp)); 237 fac_data_out++; 238 } 239 240 for (; i < ixheaacd_drc_offset->n_long; i++) { 241 dest[i] = -src1[ixheaacd_drc_offset->n_long / 2 + 242 ixheaacd_drc_offset->n_flat_ls + 243 ixheaacd_drc_offset->lfac - i - 1]; 244 } 245 return (shiftp); 246 } else { 247 memcpy(dest, over_lap, sizeof(WORD32) * (ixheaacd_drc_offset->n_flat_ls + 248 ixheaacd_drc_offset->lfac)); 249 250 for (i = ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 251 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_trans_ls; 252 i++) { 253 dest[i] = ixheaacd_add32_sat( 254 (ixheaacd_mult32_sh1(-src1[ixheaacd_drc_offset->n_long / 2 + 255 ixheaacd_drc_offset->n_flat_ls + 256 ixheaacd_drc_offset->lfac - i - 1], 257 *win_fwd) >> 258 (shiftp - shift_olap)), 259 (*fac_data_out) >> (fac_q - shift_olap)); 260 win_fwd++; 261 fac_data_out++; 262 } 263 264 for (; 265 i < ixheaacd_drc_offset->n_flat_ls + (ixheaacd_drc_offset->lfac * 3); 266 i++) { 267 dest[i] = 268 ixheaacd_add32_sat((-src1[ixheaacd_drc_offset->n_long / 2 + 269 ixheaacd_drc_offset->n_flat_ls + 270 ixheaacd_drc_offset->lfac - i - 1] >> 271 (shiftp - shift_olap)), 272 (*fac_data_out) >> (fac_q - shift_olap)); 273 fac_data_out++; 274 } 275 276 for (; i < ixheaacd_drc_offset->n_long; i++) { 277 dest[i] = -src1[ixheaacd_drc_offset->n_long / 2 + 278 ixheaacd_drc_offset->n_flat_ls + 279 ixheaacd_drc_offset->lfac - i - 1] >> 280 (shiftp - shift_olap); 281 } 282 return (shift_olap); 283 } 284 } 285 } 286 287 WORD8 ixheaacd_windowing_long3(WORD32 *src1, const WORD32 *win_fwd, 288 WORD32 *over_lap, WORD32 *p_out_buffer, 289 const WORD32 *win_rev, 290 offset_lengths *ixheaacd_drc_offset, 291 WORD8 shiftp, WORD8 shift_olap) { 292 WORD32 i; 293 WORD32 *dest = p_out_buffer; 294 295 if (shiftp > shift_olap) { 296 memcpy(dest, over_lap, sizeof(FLOAT32) * ixheaacd_drc_offset->n_flat_ls); 297 298 for (i = ixheaacd_drc_offset->n_flat_ls; 299 i < ixheaacd_drc_offset->n_long / 2; i++) { 300 dest[i] = ixheaacd_add32_sat( 301 (ixheaacd_mult32_sh1(src1[i], *win_fwd) >> (shiftp - shift_olap)), 302 ixheaacd_mult32_sh1(over_lap[i], *win_rev)); 303 win_fwd++; 304 win_rev--; 305 } 306 307 for (i = ixheaacd_drc_offset->n_long / 2; 308 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_trans_ls; 309 i++) { 310 dest[i] = ixheaacd_add32_sat( 311 (ixheaacd_mult32_sh1(-src1[ixheaacd_drc_offset->n_long - i - 1], 312 *win_fwd) >> 313 (shiftp - shift_olap)), 314 ixheaacd_mult32_sh1(over_lap[i], *win_rev)); 315 win_fwd++; 316 win_rev--; 317 } 318 319 for (; i < ixheaacd_drc_offset->n_long; i++) { 320 dest[i] = 321 -src1[ixheaacd_drc_offset->n_long - i - 1] >> (shiftp - shift_olap); 322 } 323 324 return (shift_olap); 325 } else { 326 for (i = 0; i < ixheaacd_drc_offset->n_flat_ls; i++) { 327 dest[i] = over_lap[i] >> (shift_olap - shiftp); 328 } 329 330 for (i = ixheaacd_drc_offset->n_flat_ls; 331 i < ixheaacd_drc_offset->n_long / 2; i++) { 332 dest[i] = ixheaacd_add32_sat( 333 ixheaacd_mult32_sh1(src1[i], *win_fwd), 334 ixheaacd_mult32_sh1(over_lap[i], *win_rev) >> (shift_olap - shiftp)); 335 win_fwd++; 336 win_rev--; 337 } 338 339 for (i = ixheaacd_drc_offset->n_long / 2; 340 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_trans_ls; 341 i++) { 342 dest[i] = ixheaacd_add32_sat( 343 ixheaacd_mult32_sh1(-src1[ixheaacd_drc_offset->n_long - i - 1], 344 *win_fwd), 345 ixheaacd_mult32_sh1(over_lap[i], *win_rev) >> (shift_olap - shiftp)); 346 win_fwd++; 347 win_rev--; 348 } 349 350 for (; i < ixheaacd_drc_offset->n_long; i++) { 351 dest[i] = -src1[ixheaacd_drc_offset->n_long - i - 1]; 352 } 353 354 return (shiftp); 355 } 356 } 357 358 VOID ixheaacd_windowing_short1(WORD32 *src1, WORD32 *src2, WORD32 *fp, 359 offset_lengths *ixheaacd_drc_offset, 360 WORD8 shiftp, WORD8 shift_olap) { 361 WORD32 i; 362 WORD32 *dest = fp; 363 364 if (shift_olap > shiftp) { 365 if (ixheaacd_drc_offset->n_short > ixheaacd_drc_offset->lfac) { 366 for (i = 0; i < ixheaacd_drc_offset->lfac; i++) { 367 dest[i] = dest[i] >> (shift_olap - shiftp); 368 } 369 for (i = ixheaacd_drc_offset->lfac; i < ixheaacd_drc_offset->n_short; 370 i++) { 371 dest[i] = ixheaacd_mult32_sh1( 372 -src1[ixheaacd_drc_offset->n_short - i - 1], src2[i]); 373 } 374 375 for (; i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 376 i++) { 377 dest[i] = 0; 378 } 379 } else { 380 for (i = 0; i < ixheaacd_drc_offset->lfac; i++) { 381 dest[i] = dest[i] >> (shift_olap - shiftp); 382 } 383 for (i = ixheaacd_drc_offset->lfac; 384 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 385 i++) { 386 dest[i] = 0; 387 } 388 } 389 } else { 390 if (ixheaacd_drc_offset->n_short > ixheaacd_drc_offset->lfac) { 391 for (i = ixheaacd_drc_offset->lfac; i < ixheaacd_drc_offset->n_short; 392 i++) { 393 dest[i] = ixheaacd_mult32_sh1( 394 -src1[ixheaacd_drc_offset->n_short - i - 1], src2[i]) >> 395 (shiftp - shift_olap); 396 } 397 398 for (; i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 399 i++) { 400 dest[i] = 0; 401 } 402 } else { 403 for (i = ixheaacd_drc_offset->lfac; 404 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->lfac; 405 i++) { 406 dest[i] = 0; 407 } 408 } 409 } 410 } 411 412 VOID ixheaacd_windowing_short2(WORD32 *src1, WORD32 *win_fwd, WORD32 *fp, 413 offset_lengths *ixheaacd_drc_offset, 414 WORD8 shiftp, WORD8 shift_olap) { 415 WORD32 i; 416 417 WORD32 *win_rev = win_fwd + ixheaacd_drc_offset->n_short - 1; 418 419 if (shift_olap > shiftp) { 420 for (i = 0; i < ixheaacd_drc_offset->n_short / 2; i++) { 421 fp[i] = ixheaacd_add32_sat( 422 ixheaacd_mult32_sh1(src1[i], *win_fwd), 423 (ixheaacd_mult32_sh1(fp[i], *win_rev) >> (shift_olap - shiftp))); 424 425 fp[ixheaacd_drc_offset->n_short - i - 1] = ixheaacd_add32_sat( 426 ixheaacd_mult32_sh1(-src1[i], *win_rev), 427 (ixheaacd_mult32_sh1(fp[ixheaacd_drc_offset->n_short - i - 1], 428 *win_fwd) >> 429 (shift_olap - shiftp))); 430 win_fwd++; 431 win_rev--; 432 } 433 434 for (i = ixheaacd_drc_offset->n_short; 435 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_short; 436 i++) { 437 fp[i] = 0; 438 } 439 } else { 440 for (i = 0; i < ixheaacd_drc_offset->n_short / 2; i++) { 441 fp[i] = ixheaacd_add32_sat( 442 (ixheaacd_mult32_sh1(src1[i], *win_fwd) >> (shiftp - shift_olap)), 443 ixheaacd_mult32_sh1(fp[i], *win_rev)); 444 445 fp[ixheaacd_drc_offset->n_short - i - 1] = ixheaacd_add32_sat( 446 (ixheaacd_mult32_sh1(-src1[i], *win_rev) >> (shiftp - shift_olap)), 447 ixheaacd_mult32_sh1(fp[ixheaacd_drc_offset->n_short - i - 1], 448 *win_fwd)); 449 450 win_fwd++; 451 win_rev--; 452 } 453 454 for (i = ixheaacd_drc_offset->n_short; 455 i < ixheaacd_drc_offset->n_flat_ls + ixheaacd_drc_offset->n_short; 456 i++) { 457 fp[i] = 0; 458 } 459 } 460 } 461 462 WORD8 ixheaacd_windowing_short3(WORD32 *src1, WORD32 *win_rev, WORD32 *fp, 463 WORD32 n_short, WORD8 shiftp, 464 WORD8 shift_olap) { 465 WORD32 i; 466 const WORD32 *win_fwd = win_rev - n_short + 1; 467 if (shift_olap > shiftp) { 468 for (i = 0; i < n_short / 2; i++) { 469 fp[i] = ixheaacd_add32_sat( 470 ixheaacd_mult32_sh1(-src1[n_short / 2 - i - 1], *win_rev), 471 (fp[i] >> (shift_olap - shiftp))); 472 473 fp[n_short - i - 1] = ixheaacd_add32_sat( 474 ixheaacd_mult32_sh1(-src1[n_short / 2 - i - 1], *win_fwd), 475 (fp[n_short - i - 1] >> (shift_olap - shiftp))); 476 win_rev--; 477 win_fwd++; 478 } 479 return (shiftp); 480 } else { 481 for (i = 0; i < n_short / 2; i++) { 482 fp[i] = ixheaacd_add32_sat( 483 (ixheaacd_mult32_sh1(-src1[n_short / 2 - i - 1], *win_rev) >> 484 (shiftp - shift_olap)), 485 fp[i]); 486 487 fp[n_short - i - 1] = ixheaacd_add32_sat( 488 (ixheaacd_mult32_sh1(-src1[n_short / 2 - i - 1], *win_fwd) >> 489 (shiftp - shift_olap)), 490 fp[n_short - i - 1]); 491 492 win_rev--; 493 win_fwd++; 494 } 495 return (shift_olap); 496 } 497 } 498 499 WORD8 ixheaacd_windowing_short4(WORD32 *src1, WORD32 *win_fwd, WORD32 *fp, 500 WORD32 *win_fwd1, WORD32 n_short, WORD32 flag, 501 WORD8 shiftp, WORD8 shift_olap, 502 WORD8 output_q) { 503 WORD32 i; 504 const WORD32 *win_rev = win_fwd + n_short - 1; 505 const WORD32 *win_rev1 = win_fwd1 - n_short + 1; 506 if (shift_olap > output_q) { 507 for (i = 0; i < n_short / 2; i++) { 508 fp[i] = ixheaacd_add32_sat( 509 ixheaacd_mult32_sh1(src1[n_short / 2 + i], *win_fwd) >> 510 (shiftp - output_q), 511 fp[i]); 512 513 fp[n_short - i - 1] = ixheaacd_add32_sat( 514 ixheaacd_mult32_sh1(-src1[n_short / 2 + i], *win_rev) >> 515 (shiftp - output_q), 516 fp[n_short - i - 1]); 517 518 win_fwd++; 519 win_rev--; 520 } 521 if (flag == 1) { 522 for (; i < n_short; i++) { 523 fp[i + n_short / 2] = ixheaacd_add32_sat( 524 ixheaacd_mult32_sh1(-src1[n_short - i - 1], *win_fwd1) >> 525 (shiftp - output_q), 526 (fp[i + n_short / 2] >> (shift_olap - output_q))); 527 528 fp[3 * n_short - n_short / 2 - i - 1] = ixheaacd_add32_sat( 529 ixheaacd_mult32_sh1(-src1[n_short - i - 1], *win_rev1) >> 530 (shiftp - output_q), 531 (fp[3 * n_short - n_short / 2 - i - 1] >> (shift_olap - output_q))); 532 533 win_fwd1--; 534 win_rev1++; 535 } 536 } else { 537 for (; i < n_short; i++) { 538 fp[i + n_short / 2] = 539 ixheaacd_add32_sat(-src1[n_short - i - 1] >> (shiftp - output_q), 540 fp[i + n_short / 2] >> (shift_olap - output_q)); 541 fp[3 * n_short - n_short / 2 - i - 1] = ixheaacd_add32_sat( 542 -src1[n_short - i - 1] >> (shiftp - output_q), 543 fp[3 * n_short - n_short / 2 - i - 1] >> (shift_olap - output_q)); 544 } 545 } 546 return (output_q); 547 } else { 548 for (i = 0; i < n_short / 2; i++) { 549 fp[i] = ixheaacd_add32_sat( 550 ixheaacd_mult32_sh1(src1[n_short / 2 + i], *win_fwd) >> 551 (shiftp - shift_olap), 552 fp[i] >> (output_q - shift_olap)); 553 554 fp[n_short - i - 1] = ixheaacd_add32_sat( 555 ixheaacd_mult32_sh1(-src1[n_short / 2 + i], *win_rev) >> 556 (shiftp - shift_olap), 557 fp[n_short - i - 1]); 558 559 win_fwd++; 560 win_rev--; 561 } 562 if (flag == 1) { 563 for (; i < n_short; i++) { 564 fp[i + n_short / 2] = ixheaacd_add32_sat( 565 ixheaacd_mult32_sh1(-src1[n_short - i - 1], *win_fwd1) >> 566 (shiftp - shift_olap), 567 fp[i + n_short / 2]); 568 569 fp[3 * n_short - n_short / 2 - i - 1] = ixheaacd_add32_sat( 570 ixheaacd_mult32_sh1(-src1[n_short - i - 1], *win_rev1) >> 571 (shiftp - shift_olap), 572 fp[3 * n_short - n_short / 2 - i - 1]); 573 574 win_fwd1--; 575 win_rev1++; 576 } 577 } else { 578 for (; i < n_short; i++) { 579 fp[i + n_short / 2] = 580 ixheaacd_add32_sat(-src1[n_short - i - 1] >> (shiftp - shift_olap), 581 fp[i + n_short / 2]); 582 fp[3 * n_short - n_short / 2 - i - 1] = 583 ixheaacd_add32_sat(-src1[n_short - i - 1] >> (shiftp - shift_olap), 584 fp[3 * n_short - n_short / 2 - i - 1]); 585 } 586 } 587 return (shift_olap); 588 } 589 } 590 591 VOID ixheaacd_scale_down(WORD32 *dest, WORD32 *src, WORD32 len, WORD8 shift1, 592 WORD8 shift2) { 593 WORD32 i; 594 if (shift1 > shift2) { 595 for (i = 0; i < len; i++) { 596 *dest = *src >> (shift1 - shift2); 597 src++; 598 dest++; 599 } 600 } else { 601 for (i = 0; i < len; i++) { 602 *dest = *src << (shift2 - shift1); 603 src++; 604 dest++; 605 } 606 } 607 } 608
