1/* 2 * Copyright (C) 2003 James Klicman <james@klicman.org> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include "config.h" 22 23#include "libavutil/attributes.h" 24#include "libavutil/cpu.h" 25#include "libavutil/ppc/cpu.h" 26#include "libavutil/ppc/util_altivec.h" 27 28#include "libavcodec/fdctdsp.h" 29 30#include "fdct.h" 31 32#if HAVE_ALTIVEC 33 34#define vs16(v) ((vector signed short) (v)) 35#define vs32(v) ((vector signed int) (v)) 36#define vu8(v) ((vector unsigned char) (v)) 37#define vu16(v) ((vector unsigned short) (v)) 38#define vu32(v) ((vector unsigned int) (v)) 39 40#define C1 0.98078528040323044912618224 /* cos(1 * PI / 16) */ 41#define C2 0.92387953251128675612818319 /* cos(2 * PI / 16) */ 42#define C3 0.83146961230254523707878838 /* cos(3 * PI / 16) */ 43#define C4 0.70710678118654752440084436 /* cos(4 * PI / 16) */ 44#define C5 0.55557023301960222474283081 /* cos(5 * PI / 16) */ 45#define C6 0.38268343236508977172845998 /* cos(6 * PI / 16) */ 46#define C7 0.19509032201612826784828487 /* cos(7 * PI / 16) */ 47 48#define W0 -(2 * C2) 49#define W1 (2 * C6) 50#define W2 (M_SQRT2 * C6) 51#define W3 (M_SQRT2 * C3) 52#define W4 (M_SQRT2 * (-C1 + C3 + C5 - C7)) 53#define W5 (M_SQRT2 * (C1 + C3 - C5 + C7)) 54#define W6 (M_SQRT2 * (C1 + C3 + C5 - C7)) 55#define W7 (M_SQRT2 * (C1 + C3 - C5 - C7)) 56#define W8 (M_SQRT2 * (C7 - C3)) 57#define W9 (M_SQRT2 * (-C1 - C3)) 58#define WA (M_SQRT2 * (-C3 - C5)) 59#define WB (M_SQRT2 * (C5 - C3)) 60 61static const vector float fdctconsts[3] = { 62 { W0, W1, W2, W3 }, 63 { W4, W5, W6, W7 }, 64 { W8, W9, WA, WB } 65}; 66 67#define LD_W0 vec_splat(cnsts0, 0) 68#define LD_W1 vec_splat(cnsts0, 1) 69#define LD_W2 vec_splat(cnsts0, 2) 70#define LD_W3 vec_splat(cnsts0, 3) 71#define LD_W4 vec_splat(cnsts1, 0) 72#define LD_W5 vec_splat(cnsts1, 1) 73#define LD_W6 vec_splat(cnsts1, 2) 74#define LD_W7 vec_splat(cnsts1, 3) 75#define LD_W8 vec_splat(cnsts2, 0) 76#define LD_W9 vec_splat(cnsts2, 1) 77#define LD_WA vec_splat(cnsts2, 2) 78#define LD_WB vec_splat(cnsts2, 3) 79 80#define FDCTROW(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */ \ 81 x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \ 82 x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \ 83 x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \ 84 x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \ 85 x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \ 86 x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \ 87 x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \ 88 x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \ 89 \ 90 b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \ 91 b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \ 92 b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \ 93 b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \ 94 \ 95 b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \ 96 b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \ 97 b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \ 98 cnst = LD_W2; \ 99 b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \ 100 cnst = LD_W1; \ 101 b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \ 102 cnst = LD_W0; \ 103 b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \ 104 \ 105 x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \ 106 x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \ 107 x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \ 108 x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \ 109 x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \ 110 cnst = LD_W3; \ 111 x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \ 112 \ 113 cnst = LD_W8; \ 114 x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \ 115 cnst = LD_W9; \ 116 x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \ 117 cnst = LD_WA; \ 118 x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \ 119 cnst = LD_WB; \ 120 x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \ 121 \ 122 cnst = LD_W4; \ 123 b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \ 124 cnst = LD_W5; \ 125 b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \ 126 cnst = LD_W6; \ 127 b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \ 128 cnst = LD_W7; \ 129 b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \ 130 \ 131 b7 = vec_add(b7, x2); /* b7 = b7 + x2; */ \ 132 b5 = vec_add(b5, x3); /* b5 = b5 + x3; */ \ 133 b3 = vec_add(b3, x2); /* b3 = b3 + x2; */ \ 134 b1 = vec_add(b1, x3) /* b1 = b1 + x3; */ \ 135 /* }}} */ 136 137#define FDCTCOL(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */ \ 138 x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \ 139 x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \ 140 x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \ 141 x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \ 142 x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \ 143 x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \ 144 x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \ 145 x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \ 146 \ 147 b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \ 148 b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \ 149 b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \ 150 b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \ 151 \ 152 b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \ 153 b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \ 154 b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \ 155 cnst = LD_W2; \ 156 b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \ 157 cnst = LD_W1; \ 158 b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \ 159 cnst = LD_W0; \ 160 b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \ 161 \ 162 x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \ 163 x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \ 164 x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \ 165 x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \ 166 x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \ 167 cnst = LD_W3; \ 168 x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \ 169 \ 170 cnst = LD_W8; \ 171 x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \ 172 cnst = LD_W9; \ 173 x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \ 174 cnst = LD_WA; \ 175 x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \ 176 cnst = LD_WB; \ 177 x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \ 178 \ 179 cnst = LD_W4; \ 180 b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \ 181 cnst = LD_W5; \ 182 b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \ 183 cnst = LD_W6; \ 184 b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \ 185 cnst = LD_W7; \ 186 b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \ 187 \ 188 b7 = vec_add(b7, x2); /* b7 += x2; */ \ 189 b5 = vec_add(b5, x3); /* b5 += x3; */ \ 190 b3 = vec_add(b3, x2); /* b3 += x2; */ \ 191 b1 = vec_add(b1, x3) /* b1 += x3; */ \ 192 /* }}} */ 193 194/* two dimensional discrete cosine transform */ 195void ff_fdct_altivec(int16_t *block) 196{ 197 vector signed short *bp; 198 const vector float *cp = fdctconsts; 199 vector float b00, b10, b20, b30, b40, b50, b60, b70; 200 vector float b01, b11, b21, b31, b41, b51, b61, b71; 201 vector float mzero, cnst, cnsts0, cnsts1, cnsts2; 202 vector float x0, x1, x2, x3, x4, x5, x6, x7, x8; 203 204 /* setup constants {{{ */ 205 /* mzero = -0.0 */ 206 mzero = ((vector float) vec_splat_u32(-1)); 207 mzero = ((vector float) vec_sl(vu32(mzero), vu32(mzero))); 208 cnsts0 = vec_ld(0, cp); 209 cp++; 210 cnsts1 = vec_ld(0, cp); 211 cp++; 212 cnsts2 = vec_ld(0, cp); 213 /* }}} */ 214 215 /* 8x8 matrix transpose (vector short[8]) {{{ */ 216#define MERGE_S16(hl, a, b) vec_merge ## hl(vs16(a), vs16(b)) 217 218 bp = (vector signed short *) block; 219 b00 = ((vector float) vec_ld(0, bp)); 220 b40 = ((vector float) vec_ld(16 * 4, bp)); 221 b01 = ((vector float) MERGE_S16(h, b00, b40)); 222 b11 = ((vector float) MERGE_S16(l, b00, b40)); 223 bp++; 224 b10 = ((vector float) vec_ld(0, bp)); 225 b50 = ((vector float) vec_ld(16 * 4, bp)); 226 b21 = ((vector float) MERGE_S16(h, b10, b50)); 227 b31 = ((vector float) MERGE_S16(l, b10, b50)); 228 bp++; 229 b20 = ((vector float) vec_ld(0, bp)); 230 b60 = ((vector float) vec_ld(16 * 4, bp)); 231 b41 = ((vector float) MERGE_S16(h, b20, b60)); 232 b51 = ((vector float) MERGE_S16(l, b20, b60)); 233 bp++; 234 b30 = ((vector float) vec_ld(0, bp)); 235 b70 = ((vector float) vec_ld(16 * 4, bp)); 236 b61 = ((vector float) MERGE_S16(h, b30, b70)); 237 b71 = ((vector float) MERGE_S16(l, b30, b70)); 238 239 x0 = ((vector float) MERGE_S16(h, b01, b41)); 240 x1 = ((vector float) MERGE_S16(l, b01, b41)); 241 x2 = ((vector float) MERGE_S16(h, b11, b51)); 242 x3 = ((vector float) MERGE_S16(l, b11, b51)); 243 x4 = ((vector float) MERGE_S16(h, b21, b61)); 244 x5 = ((vector float) MERGE_S16(l, b21, b61)); 245 x6 = ((vector float) MERGE_S16(h, b31, b71)); 246 x7 = ((vector float) MERGE_S16(l, b31, b71)); 247 248 b00 = ((vector float) MERGE_S16(h, x0, x4)); 249 b10 = ((vector float) MERGE_S16(l, x0, x4)); 250 b20 = ((vector float) MERGE_S16(h, x1, x5)); 251 b30 = ((vector float) MERGE_S16(l, x1, x5)); 252 b40 = ((vector float) MERGE_S16(h, x2, x6)); 253 b50 = ((vector float) MERGE_S16(l, x2, x6)); 254 b60 = ((vector float) MERGE_S16(h, x3, x7)); 255 b70 = ((vector float) MERGE_S16(l, x3, x7)); 256 257#undef MERGE_S16 258 /* }}} */ 259 260 /* Some of the initial calculations can be done as vector short 261 * before conversion to vector float. The following code section 262 * takes advantage of this. */ 263 264 /* fdct rows {{{ */ 265 x0 = ((vector float) vec_add(vs16(b00), vs16(b70))); 266 x7 = ((vector float) vec_sub(vs16(b00), vs16(b70))); 267 x1 = ((vector float) vec_add(vs16(b10), vs16(b60))); 268 x6 = ((vector float) vec_sub(vs16(b10), vs16(b60))); 269 x2 = ((vector float) vec_add(vs16(b20), vs16(b50))); 270 x5 = ((vector float) vec_sub(vs16(b20), vs16(b50))); 271 x3 = ((vector float) vec_add(vs16(b30), vs16(b40))); 272 x4 = ((vector float) vec_sub(vs16(b30), vs16(b40))); 273 274 b70 = ((vector float) vec_add(vs16(x0), vs16(x3))); 275 b10 = ((vector float) vec_add(vs16(x1), vs16(x2))); 276 277 b00 = ((vector float) vec_add(vs16(b70), vs16(b10))); 278 b40 = ((vector float) vec_sub(vs16(b70), vs16(b10))); 279 280#define CTF0(n) \ 281 b ## n ## 1 = ((vector float) vec_unpackl(vs16(b ## n ## 0))); \ 282 b ## n ## 0 = ((vector float) vec_unpackh(vs16(b ## n ## 0))); \ 283 b ## n ## 1 = vec_ctf(vs32(b ## n ## 1), 0); \ 284 b ## n ## 0 = vec_ctf(vs32(b ## n ## 0), 0) 285 286 CTF0(0); 287 CTF0(4); 288 289 b20 = ((vector float) vec_sub(vs16(x0), vs16(x3))); 290 b60 = ((vector float) vec_sub(vs16(x1), vs16(x2))); 291 292 CTF0(2); 293 CTF0(6); 294 295#undef CTF0 296 297 x0 = vec_add(b60, b20); 298 x1 = vec_add(b61, b21); 299 300 cnst = LD_W2; 301 x0 = vec_madd(cnst, x0, mzero); 302 x1 = vec_madd(cnst, x1, mzero); 303 cnst = LD_W1; 304 b20 = vec_madd(cnst, b20, x0); 305 b21 = vec_madd(cnst, b21, x1); 306 cnst = LD_W0; 307 b60 = vec_madd(cnst, b60, x0); 308 b61 = vec_madd(cnst, b61, x1); 309 310#define CTFX(x, b) \ 311 b ## 0 = ((vector float) vec_unpackh(vs16(x))); \ 312 b ## 1 = ((vector float) vec_unpackl(vs16(x))); \ 313 b ## 0 = vec_ctf(vs32(b ## 0), 0); \ 314 b ## 1 = vec_ctf(vs32(b ## 1), 0) 315 316 CTFX(x4, b7); 317 CTFX(x5, b5); 318 CTFX(x6, b3); 319 CTFX(x7, b1); 320 321#undef CTFX 322 323 x0 = vec_add(b70, b10); 324 x1 = vec_add(b50, b30); 325 x2 = vec_add(b70, b30); 326 x3 = vec_add(b50, b10); 327 x8 = vec_add(x2, x3); 328 cnst = LD_W3; 329 x8 = vec_madd(cnst, x8, mzero); 330 331 cnst = LD_W8; 332 x0 = vec_madd(cnst, x0, mzero); 333 cnst = LD_W9; 334 x1 = vec_madd(cnst, x1, mzero); 335 cnst = LD_WA; 336 x2 = vec_madd(cnst, x2, x8); 337 cnst = LD_WB; 338 x3 = vec_madd(cnst, x3, x8); 339 340 cnst = LD_W4; 341 b70 = vec_madd(cnst, b70, x0); 342 cnst = LD_W5; 343 b50 = vec_madd(cnst, b50, x1); 344 cnst = LD_W6; 345 b30 = vec_madd(cnst, b30, x1); 346 cnst = LD_W7; 347 b10 = vec_madd(cnst, b10, x0); 348 349 b70 = vec_add(b70, x2); 350 b50 = vec_add(b50, x3); 351 b30 = vec_add(b30, x2); 352 b10 = vec_add(b10, x3); 353 354 x0 = vec_add(b71, b11); 355 x1 = vec_add(b51, b31); 356 x2 = vec_add(b71, b31); 357 x3 = vec_add(b51, b11); 358 x8 = vec_add(x2, x3); 359 cnst = LD_W3; 360 x8 = vec_madd(cnst, x8, mzero); 361 362 cnst = LD_W8; 363 x0 = vec_madd(cnst, x0, mzero); 364 cnst = LD_W9; 365 x1 = vec_madd(cnst, x1, mzero); 366 cnst = LD_WA; 367 x2 = vec_madd(cnst, x2, x8); 368 cnst = LD_WB; 369 x3 = vec_madd(cnst, x3, x8); 370 371 cnst = LD_W4; 372 b71 = vec_madd(cnst, b71, x0); 373 cnst = LD_W5; 374 b51 = vec_madd(cnst, b51, x1); 375 cnst = LD_W6; 376 b31 = vec_madd(cnst, b31, x1); 377 cnst = LD_W7; 378 b11 = vec_madd(cnst, b11, x0); 379 380 b71 = vec_add(b71, x2); 381 b51 = vec_add(b51, x3); 382 b31 = vec_add(b31, x2); 383 b11 = vec_add(b11, x3); 384 /* }}} */ 385 386 /* 8x8 matrix transpose (vector float[8][2]) {{{ */ 387 x0 = vec_mergel(b00, b20); 388 x1 = vec_mergeh(b00, b20); 389 x2 = vec_mergel(b10, b30); 390 x3 = vec_mergeh(b10, b30); 391 392 b00 = vec_mergeh(x1, x3); 393 b10 = vec_mergel(x1, x3); 394 b20 = vec_mergeh(x0, x2); 395 b30 = vec_mergel(x0, x2); 396 397 x4 = vec_mergel(b41, b61); 398 x5 = vec_mergeh(b41, b61); 399 x6 = vec_mergel(b51, b71); 400 x7 = vec_mergeh(b51, b71); 401 402 b41 = vec_mergeh(x5, x7); 403 b51 = vec_mergel(x5, x7); 404 b61 = vec_mergeh(x4, x6); 405 b71 = vec_mergel(x4, x6); 406 407 x0 = vec_mergel(b01, b21); 408 x1 = vec_mergeh(b01, b21); 409 x2 = vec_mergel(b11, b31); 410 x3 = vec_mergeh(b11, b31); 411 412 x4 = vec_mergel(b40, b60); 413 x5 = vec_mergeh(b40, b60); 414 x6 = vec_mergel(b50, b70); 415 x7 = vec_mergeh(b50, b70); 416 417 b40 = vec_mergeh(x1, x3); 418 b50 = vec_mergel(x1, x3); 419 b60 = vec_mergeh(x0, x2); 420 b70 = vec_mergel(x0, x2); 421 422 b01 = vec_mergeh(x5, x7); 423 b11 = vec_mergel(x5, x7); 424 b21 = vec_mergeh(x4, x6); 425 b31 = vec_mergel(x4, x6); 426 /* }}} */ 427 428 FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70); 429 FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71); 430 431 /* round, convert back to short {{{ */ 432#define CTS(n) \ 433 b ## n ## 0 = vec_round(b ## n ## 0); \ 434 b ## n ## 1 = vec_round(b ## n ## 1); \ 435 b ## n ## 0 = ((vector float) vec_cts(b ## n ## 0, 0)); \ 436 b ## n ## 1 = ((vector float) vec_cts(b ## n ## 1, 0)); \ 437 b ## n ## 0 = ((vector float) vec_pack(vs32(b ## n ## 0), \ 438 vs32(b ## n ## 1))); \ 439 vec_st(vs16(b ## n ## 0), 0, bp) 440 441 bp = (vector signed short *) block; 442 CTS(0); 443 bp++; 444 CTS(1); 445 bp++; 446 CTS(2); 447 bp++; 448 CTS(3); 449 bp++; 450 CTS(4); 451 bp++; 452 CTS(5); 453 bp++; 454 CTS(6); 455 bp++; 456 CTS(7); 457 458#undef CTS 459 /* }}} */ 460} 461 462#endif /* HAVE_ALTIVEC */ 463 464av_cold void ff_fdctdsp_init_ppc(FDCTDSPContext *c, AVCodecContext *avctx, 465 unsigned high_bit_depth) 466{ 467#if HAVE_ALTIVEC 468 if (!PPC_ALTIVEC(av_get_cpu_flags())) 469 return; 470 471 if (!high_bit_depth) { 472 if (avctx->dct_algo == FF_DCT_AUTO || 473 avctx->dct_algo == FF_DCT_ALTIVEC) { 474 c->fdct = ff_fdct_altivec; 475 } 476 } 477#endif /* HAVE_ALTIVEC */ 478} 479