dec.c revision a2415724fb3466168b2af5b08bd94ba732c0e753
1// Copyright 2010 Google Inc. All Rights Reserved. 2// 3// This code is licensed under the same terms as WebM: 4// Software License Agreement: http://www.webmproject.org/license/software/ 5// Additional IP Rights Grant: http://www.webmproject.org/license/additional/ 6// ----------------------------------------------------------------------------- 7// 8// Speed-critical decoding functions. 9// 10// Author: Skal (pascal.massimino@gmail.com) 11 12#include "./dsp.h" 13#include "../dec/vp8i.h" 14 15#if defined(__cplusplus) || defined(c_plusplus) 16extern "C" { 17#endif 18 19//------------------------------------------------------------------------------ 20// run-time tables (~4k) 21 22static uint8_t abs0[255 + 255 + 1]; // abs(i) 23static uint8_t abs1[255 + 255 + 1]; // abs(i)>>1 24static int8_t sclip1[1020 + 1020 + 1]; // clips [-1020, 1020] to [-128, 127] 25static int8_t sclip2[112 + 112 + 1]; // clips [-112, 112] to [-16, 15] 26static uint8_t clip1[255 + 510 + 1]; // clips [-255,510] to [0,255] 27 28// We declare this variable 'volatile' to prevent instruction reordering 29// and make sure it's set to true _last_ (so as to be thread-safe) 30static volatile int tables_ok = 0; 31 32static void DspInitTables(void) { 33 if (!tables_ok) { 34 int i; 35 for (i = -255; i <= 255; ++i) { 36 abs0[255 + i] = (i < 0) ? -i : i; 37 abs1[255 + i] = abs0[255 + i] >> 1; 38 } 39 for (i = -1020; i <= 1020; ++i) { 40 sclip1[1020 + i] = (i < -128) ? -128 : (i > 127) ? 127 : i; 41 } 42 for (i = -112; i <= 112; ++i) { 43 sclip2[112 + i] = (i < -16) ? -16 : (i > 15) ? 15 : i; 44 } 45 for (i = -255; i <= 255 + 255; ++i) { 46 clip1[255 + i] = (i < 0) ? 0 : (i > 255) ? 255 : i; 47 } 48 tables_ok = 1; 49 } 50} 51 52static WEBP_INLINE uint8_t clip_8b(int v) { 53 return (!(v & ~0xff)) ? v : (v < 0) ? 0 : 255; 54} 55 56//------------------------------------------------------------------------------ 57// Transforms (Paragraph 14.4) 58 59#define STORE(x, y, v) \ 60 dst[x + y * BPS] = clip_8b(dst[x + y * BPS] + ((v) >> 3)) 61 62static const int kC1 = 20091 + (1 << 16); 63static const int kC2 = 35468; 64#define MUL(a, b) (((a) * (b)) >> 16) 65 66static void TransformOne(const int16_t* in, uint8_t* dst) { 67 int C[4 * 4], *tmp; 68 int i; 69 tmp = C; 70 for (i = 0; i < 4; ++i) { // vertical pass 71 const int a = in[0] + in[8]; // [-4096, 4094] 72 const int b = in[0] - in[8]; // [-4095, 4095] 73 const int c = MUL(in[4], kC2) - MUL(in[12], kC1); // [-3783, 3783] 74 const int d = MUL(in[4], kC1) + MUL(in[12], kC2); // [-3785, 3781] 75 tmp[0] = a + d; // [-7881, 7875] 76 tmp[1] = b + c; // [-7878, 7878] 77 tmp[2] = b - c; // [-7878, 7878] 78 tmp[3] = a - d; // [-7877, 7879] 79 tmp += 4; 80 in++; 81 } 82 // Each pass is expanding the dynamic range by ~3.85 (upper bound). 83 // The exact value is (2. + (kC1 + kC2) / 65536). 84 // After the second pass, maximum interval is [-3794, 3794], assuming 85 // an input in [-2048, 2047] interval. We then need to add a dst value 86 // in the [0, 255] range. 87 // In the worst case scenario, the input to clip_8b() can be as large as 88 // [-60713, 60968]. 89 tmp = C; 90 for (i = 0; i < 4; ++i) { // horizontal pass 91 const int dc = tmp[0] + 4; 92 const int a = dc + tmp[8]; 93 const int b = dc - tmp[8]; 94 const int c = MUL(tmp[4], kC2) - MUL(tmp[12], kC1); 95 const int d = MUL(tmp[4], kC1) + MUL(tmp[12], kC2); 96 STORE(0, 0, a + d); 97 STORE(1, 0, b + c); 98 STORE(2, 0, b - c); 99 STORE(3, 0, a - d); 100 tmp++; 101 dst += BPS; 102 } 103} 104#undef MUL 105 106static void TransformTwo(const int16_t* in, uint8_t* dst, int do_two) { 107 TransformOne(in, dst); 108 if (do_two) { 109 TransformOne(in + 16, dst + 4); 110 } 111} 112 113static void TransformUV(const int16_t* in, uint8_t* dst) { 114 VP8Transform(in + 0 * 16, dst, 1); 115 VP8Transform(in + 2 * 16, dst + 4 * BPS, 1); 116} 117 118static void TransformDC(const int16_t *in, uint8_t* dst) { 119 const int DC = in[0] + 4; 120 int i, j; 121 for (j = 0; j < 4; ++j) { 122 for (i = 0; i < 4; ++i) { 123 STORE(i, j, DC); 124 } 125 } 126} 127 128static void TransformDCUV(const int16_t* in, uint8_t* dst) { 129 if (in[0 * 16]) TransformDC(in + 0 * 16, dst); 130 if (in[1 * 16]) TransformDC(in + 1 * 16, dst + 4); 131 if (in[2 * 16]) TransformDC(in + 2 * 16, dst + 4 * BPS); 132 if (in[3 * 16]) TransformDC(in + 3 * 16, dst + 4 * BPS + 4); 133} 134 135#undef STORE 136 137//------------------------------------------------------------------------------ 138// Paragraph 14.3 139 140static void TransformWHT(const int16_t* in, int16_t* out) { 141 int tmp[16]; 142 int i; 143 for (i = 0; i < 4; ++i) { 144 const int a0 = in[0 + i] + in[12 + i]; 145 const int a1 = in[4 + i] + in[ 8 + i]; 146 const int a2 = in[4 + i] - in[ 8 + i]; 147 const int a3 = in[0 + i] - in[12 + i]; 148 tmp[0 + i] = a0 + a1; 149 tmp[8 + i] = a0 - a1; 150 tmp[4 + i] = a3 + a2; 151 tmp[12 + i] = a3 - a2; 152 } 153 for (i = 0; i < 4; ++i) { 154 const int dc = tmp[0 + i * 4] + 3; // w/ rounder 155 const int a0 = dc + tmp[3 + i * 4]; 156 const int a1 = tmp[1 + i * 4] + tmp[2 + i * 4]; 157 const int a2 = tmp[1 + i * 4] - tmp[2 + i * 4]; 158 const int a3 = dc - tmp[3 + i * 4]; 159 out[ 0] = (a0 + a1) >> 3; 160 out[16] = (a3 + a2) >> 3; 161 out[32] = (a0 - a1) >> 3; 162 out[48] = (a3 - a2) >> 3; 163 out += 64; 164 } 165} 166 167void (*VP8TransformWHT)(const int16_t* in, int16_t* out) = TransformWHT; 168 169//------------------------------------------------------------------------------ 170// Intra predictions 171 172#define DST(x, y) dst[(x) + (y) * BPS] 173 174static WEBP_INLINE void TrueMotion(uint8_t *dst, int size) { 175 const uint8_t* top = dst - BPS; 176 const uint8_t* const clip0 = clip1 + 255 - top[-1]; 177 int y; 178 for (y = 0; y < size; ++y) { 179 const uint8_t* const clip = clip0 + dst[-1]; 180 int x; 181 for (x = 0; x < size; ++x) { 182 dst[x] = clip[top[x]]; 183 } 184 dst += BPS; 185 } 186} 187static void TM4(uint8_t *dst) { TrueMotion(dst, 4); } 188static void TM8uv(uint8_t *dst) { TrueMotion(dst, 8); } 189static void TM16(uint8_t *dst) { TrueMotion(dst, 16); } 190 191//------------------------------------------------------------------------------ 192// 16x16 193 194static void VE16(uint8_t *dst) { // vertical 195 int j; 196 for (j = 0; j < 16; ++j) { 197 memcpy(dst + j * BPS, dst - BPS, 16); 198 } 199} 200 201static void HE16(uint8_t *dst) { // horizontal 202 int j; 203 for (j = 16; j > 0; --j) { 204 memset(dst, dst[-1], 16); 205 dst += BPS; 206 } 207} 208 209static WEBP_INLINE void Put16(int v, uint8_t* dst) { 210 int j; 211 for (j = 0; j < 16; ++j) { 212 memset(dst + j * BPS, v, 16); 213 } 214} 215 216static void DC16(uint8_t *dst) { // DC 217 int DC = 16; 218 int j; 219 for (j = 0; j < 16; ++j) { 220 DC += dst[-1 + j * BPS] + dst[j - BPS]; 221 } 222 Put16(DC >> 5, dst); 223} 224 225static void DC16NoTop(uint8_t *dst) { // DC with top samples not available 226 int DC = 8; 227 int j; 228 for (j = 0; j < 16; ++j) { 229 DC += dst[-1 + j * BPS]; 230 } 231 Put16(DC >> 4, dst); 232} 233 234static void DC16NoLeft(uint8_t *dst) { // DC with left samples not available 235 int DC = 8; 236 int i; 237 for (i = 0; i < 16; ++i) { 238 DC += dst[i - BPS]; 239 } 240 Put16(DC >> 4, dst); 241} 242 243static void DC16NoTopLeft(uint8_t *dst) { // DC with no top and left samples 244 Put16(0x80, dst); 245} 246 247//------------------------------------------------------------------------------ 248// 4x4 249 250#define AVG3(a, b, c) (((a) + 2 * (b) + (c) + 2) >> 2) 251#define AVG2(a, b) (((a) + (b) + 1) >> 1) 252 253static void VE4(uint8_t *dst) { // vertical 254 const uint8_t* top = dst - BPS; 255 const uint8_t vals[4] = { 256 AVG3(top[-1], top[0], top[1]), 257 AVG3(top[ 0], top[1], top[2]), 258 AVG3(top[ 1], top[2], top[3]), 259 AVG3(top[ 2], top[3], top[4]) 260 }; 261 int i; 262 for (i = 0; i < 4; ++i) { 263 memcpy(dst + i * BPS, vals, sizeof(vals)); 264 } 265} 266 267static void HE4(uint8_t *dst) { // horizontal 268 const int A = dst[-1 - BPS]; 269 const int B = dst[-1]; 270 const int C = dst[-1 + BPS]; 271 const int D = dst[-1 + 2 * BPS]; 272 const int E = dst[-1 + 3 * BPS]; 273 *(uint32_t*)(dst + 0 * BPS) = 0x01010101U * AVG3(A, B, C); 274 *(uint32_t*)(dst + 1 * BPS) = 0x01010101U * AVG3(B, C, D); 275 *(uint32_t*)(dst + 2 * BPS) = 0x01010101U * AVG3(C, D, E); 276 *(uint32_t*)(dst + 3 * BPS) = 0x01010101U * AVG3(D, E, E); 277} 278 279static void DC4(uint8_t *dst) { // DC 280 uint32_t dc = 4; 281 int i; 282 for (i = 0; i < 4; ++i) dc += dst[i - BPS] + dst[-1 + i * BPS]; 283 dc >>= 3; 284 for (i = 0; i < 4; ++i) memset(dst + i * BPS, dc, 4); 285} 286 287static void RD4(uint8_t *dst) { // Down-right 288 const int I = dst[-1 + 0 * BPS]; 289 const int J = dst[-1 + 1 * BPS]; 290 const int K = dst[-1 + 2 * BPS]; 291 const int L = dst[-1 + 3 * BPS]; 292 const int X = dst[-1 - BPS]; 293 const int A = dst[0 - BPS]; 294 const int B = dst[1 - BPS]; 295 const int C = dst[2 - BPS]; 296 const int D = dst[3 - BPS]; 297 DST(0, 3) = AVG3(J, K, L); 298 DST(0, 2) = DST(1, 3) = AVG3(I, J, K); 299 DST(0, 1) = DST(1, 2) = DST(2, 3) = AVG3(X, I, J); 300 DST(0, 0) = DST(1, 1) = DST(2, 2) = DST(3, 3) = AVG3(A, X, I); 301 DST(1, 0) = DST(2, 1) = DST(3, 2) = AVG3(B, A, X); 302 DST(2, 0) = DST(3, 1) = AVG3(C, B, A); 303 DST(3, 0) = AVG3(D, C, B); 304} 305 306static void LD4(uint8_t *dst) { // Down-Left 307 const int A = dst[0 - BPS]; 308 const int B = dst[1 - BPS]; 309 const int C = dst[2 - BPS]; 310 const int D = dst[3 - BPS]; 311 const int E = dst[4 - BPS]; 312 const int F = dst[5 - BPS]; 313 const int G = dst[6 - BPS]; 314 const int H = dst[7 - BPS]; 315 DST(0, 0) = AVG3(A, B, C); 316 DST(1, 0) = DST(0, 1) = AVG3(B, C, D); 317 DST(2, 0) = DST(1, 1) = DST(0, 2) = AVG3(C, D, E); 318 DST(3, 0) = DST(2, 1) = DST(1, 2) = DST(0, 3) = AVG3(D, E, F); 319 DST(3, 1) = DST(2, 2) = DST(1, 3) = AVG3(E, F, G); 320 DST(3, 2) = DST(2, 3) = AVG3(F, G, H); 321 DST(3, 3) = AVG3(G, H, H); 322} 323 324static void VR4(uint8_t *dst) { // Vertical-Right 325 const int I = dst[-1 + 0 * BPS]; 326 const int J = dst[-1 + 1 * BPS]; 327 const int K = dst[-1 + 2 * BPS]; 328 const int X = dst[-1 - BPS]; 329 const int A = dst[0 - BPS]; 330 const int B = dst[1 - BPS]; 331 const int C = dst[2 - BPS]; 332 const int D = dst[3 - BPS]; 333 DST(0, 0) = DST(1, 2) = AVG2(X, A); 334 DST(1, 0) = DST(2, 2) = AVG2(A, B); 335 DST(2, 0) = DST(3, 2) = AVG2(B, C); 336 DST(3, 0) = AVG2(C, D); 337 338 DST(0, 3) = AVG3(K, J, I); 339 DST(0, 2) = AVG3(J, I, X); 340 DST(0, 1) = DST(1, 3) = AVG3(I, X, A); 341 DST(1, 1) = DST(2, 3) = AVG3(X, A, B); 342 DST(2, 1) = DST(3, 3) = AVG3(A, B, C); 343 DST(3, 1) = AVG3(B, C, D); 344} 345 346static void VL4(uint8_t *dst) { // Vertical-Left 347 const int A = dst[0 - BPS]; 348 const int B = dst[1 - BPS]; 349 const int C = dst[2 - BPS]; 350 const int D = dst[3 - BPS]; 351 const int E = dst[4 - BPS]; 352 const int F = dst[5 - BPS]; 353 const int G = dst[6 - BPS]; 354 const int H = dst[7 - BPS]; 355 DST(0, 0) = AVG2(A, B); 356 DST(1, 0) = DST(0, 2) = AVG2(B, C); 357 DST(2, 0) = DST(1, 2) = AVG2(C, D); 358 DST(3, 0) = DST(2, 2) = AVG2(D, E); 359 360 DST(0, 1) = AVG3(A, B, C); 361 DST(1, 1) = DST(0, 3) = AVG3(B, C, D); 362 DST(2, 1) = DST(1, 3) = AVG3(C, D, E); 363 DST(3, 1) = DST(2, 3) = AVG3(D, E, F); 364 DST(3, 2) = AVG3(E, F, G); 365 DST(3, 3) = AVG3(F, G, H); 366} 367 368static void HU4(uint8_t *dst) { // Horizontal-Up 369 const int I = dst[-1 + 0 * BPS]; 370 const int J = dst[-1 + 1 * BPS]; 371 const int K = dst[-1 + 2 * BPS]; 372 const int L = dst[-1 + 3 * BPS]; 373 DST(0, 0) = AVG2(I, J); 374 DST(2, 0) = DST(0, 1) = AVG2(J, K); 375 DST(2, 1) = DST(0, 2) = AVG2(K, L); 376 DST(1, 0) = AVG3(I, J, K); 377 DST(3, 0) = DST(1, 1) = AVG3(J, K, L); 378 DST(3, 1) = DST(1, 2) = AVG3(K, L, L); 379 DST(3, 2) = DST(2, 2) = 380 DST(0, 3) = DST(1, 3) = DST(2, 3) = DST(3, 3) = L; 381} 382 383static void HD4(uint8_t *dst) { // Horizontal-Down 384 const int I = dst[-1 + 0 * BPS]; 385 const int J = dst[-1 + 1 * BPS]; 386 const int K = dst[-1 + 2 * BPS]; 387 const int L = dst[-1 + 3 * BPS]; 388 const int X = dst[-1 - BPS]; 389 const int A = dst[0 - BPS]; 390 const int B = dst[1 - BPS]; 391 const int C = dst[2 - BPS]; 392 393 DST(0, 0) = DST(2, 1) = AVG2(I, X); 394 DST(0, 1) = DST(2, 2) = AVG2(J, I); 395 DST(0, 2) = DST(2, 3) = AVG2(K, J); 396 DST(0, 3) = AVG2(L, K); 397 398 DST(3, 0) = AVG3(A, B, C); 399 DST(2, 0) = AVG3(X, A, B); 400 DST(1, 0) = DST(3, 1) = AVG3(I, X, A); 401 DST(1, 1) = DST(3, 2) = AVG3(J, I, X); 402 DST(1, 2) = DST(3, 3) = AVG3(K, J, I); 403 DST(1, 3) = AVG3(L, K, J); 404} 405 406#undef DST 407#undef AVG3 408#undef AVG2 409 410//------------------------------------------------------------------------------ 411// Chroma 412 413static void VE8uv(uint8_t *dst) { // vertical 414 int j; 415 for (j = 0; j < 8; ++j) { 416 memcpy(dst + j * BPS, dst - BPS, 8); 417 } 418} 419 420static void HE8uv(uint8_t *dst) { // horizontal 421 int j; 422 for (j = 0; j < 8; ++j) { 423 memset(dst, dst[-1], 8); 424 dst += BPS; 425 } 426} 427 428// helper for chroma-DC predictions 429static WEBP_INLINE void Put8x8uv(uint64_t v, uint8_t* dst) { 430 int j; 431 for (j = 0; j < 8; ++j) { 432 *(uint64_t*)(dst + j * BPS) = v; 433 } 434} 435 436static void DC8uv(uint8_t *dst) { // DC 437 int dc0 = 8; 438 int i; 439 for (i = 0; i < 8; ++i) { 440 dc0 += dst[i - BPS] + dst[-1 + i * BPS]; 441 } 442 Put8x8uv((uint64_t)((dc0 >> 4) * 0x0101010101010101ULL), dst); 443} 444 445static void DC8uvNoLeft(uint8_t *dst) { // DC with no left samples 446 int dc0 = 4; 447 int i; 448 for (i = 0; i < 8; ++i) { 449 dc0 += dst[i - BPS]; 450 } 451 Put8x8uv((uint64_t)((dc0 >> 3) * 0x0101010101010101ULL), dst); 452} 453 454static void DC8uvNoTop(uint8_t *dst) { // DC with no top samples 455 int dc0 = 4; 456 int i; 457 for (i = 0; i < 8; ++i) { 458 dc0 += dst[-1 + i * BPS]; 459 } 460 Put8x8uv((uint64_t)((dc0 >> 3) * 0x0101010101010101ULL), dst); 461} 462 463static void DC8uvNoTopLeft(uint8_t *dst) { // DC with nothing 464 Put8x8uv(0x8080808080808080ULL, dst); 465} 466 467//------------------------------------------------------------------------------ 468// default C implementations 469 470const VP8PredFunc VP8PredLuma4[NUM_BMODES] = { 471 DC4, TM4, VE4, HE4, RD4, VR4, LD4, VL4, HD4, HU4 472}; 473 474const VP8PredFunc VP8PredLuma16[NUM_B_DC_MODES] = { 475 DC16, TM16, VE16, HE16, 476 DC16NoTop, DC16NoLeft, DC16NoTopLeft 477}; 478 479const VP8PredFunc VP8PredChroma8[NUM_B_DC_MODES] = { 480 DC8uv, TM8uv, VE8uv, HE8uv, 481 DC8uvNoTop, DC8uvNoLeft, DC8uvNoTopLeft 482}; 483 484//------------------------------------------------------------------------------ 485// Edge filtering functions 486 487// 4 pixels in, 2 pixels out 488static WEBP_INLINE void do_filter2(uint8_t* p, int step) { 489 const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step]; 490 const int a = 3 * (q0 - p0) + sclip1[1020 + p1 - q1]; 491 const int a1 = sclip2[112 + ((a + 4) >> 3)]; 492 const int a2 = sclip2[112 + ((a + 3) >> 3)]; 493 p[-step] = clip1[255 + p0 + a2]; 494 p[ 0] = clip1[255 + q0 - a1]; 495} 496 497// 4 pixels in, 4 pixels out 498static WEBP_INLINE void do_filter4(uint8_t* p, int step) { 499 const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step]; 500 const int a = 3 * (q0 - p0); 501 const int a1 = sclip2[112 + ((a + 4) >> 3)]; 502 const int a2 = sclip2[112 + ((a + 3) >> 3)]; 503 const int a3 = (a1 + 1) >> 1; 504 p[-2*step] = clip1[255 + p1 + a3]; 505 p[- step] = clip1[255 + p0 + a2]; 506 p[ 0] = clip1[255 + q0 - a1]; 507 p[ step] = clip1[255 + q1 - a3]; 508} 509 510// 6 pixels in, 6 pixels out 511static WEBP_INLINE void do_filter6(uint8_t* p, int step) { 512 const int p2 = p[-3*step], p1 = p[-2*step], p0 = p[-step]; 513 const int q0 = p[0], q1 = p[step], q2 = p[2*step]; 514 const int a = sclip1[1020 + 3 * (q0 - p0) + sclip1[1020 + p1 - q1]]; 515 const int a1 = (27 * a + 63) >> 7; // eq. to ((3 * a + 7) * 9) >> 7 516 const int a2 = (18 * a + 63) >> 7; // eq. to ((2 * a + 7) * 9) >> 7 517 const int a3 = (9 * a + 63) >> 7; // eq. to ((1 * a + 7) * 9) >> 7 518 p[-3*step] = clip1[255 + p2 + a3]; 519 p[-2*step] = clip1[255 + p1 + a2]; 520 p[- step] = clip1[255 + p0 + a1]; 521 p[ 0] = clip1[255 + q0 - a1]; 522 p[ step] = clip1[255 + q1 - a2]; 523 p[ 2*step] = clip1[255 + q2 - a3]; 524} 525 526static WEBP_INLINE int hev(const uint8_t* p, int step, int thresh) { 527 const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step]; 528 return (abs0[255 + p1 - p0] > thresh) || (abs0[255 + q1 - q0] > thresh); 529} 530 531static WEBP_INLINE int needs_filter(const uint8_t* p, int step, int thresh) { 532 const int p1 = p[-2*step], p0 = p[-step], q0 = p[0], q1 = p[step]; 533 return (2 * abs0[255 + p0 - q0] + abs1[255 + p1 - q1]) <= thresh; 534} 535 536static WEBP_INLINE int needs_filter2(const uint8_t* p, 537 int step, int t, int it) { 538 const int p3 = p[-4*step], p2 = p[-3*step], p1 = p[-2*step], p0 = p[-step]; 539 const int q0 = p[0], q1 = p[step], q2 = p[2*step], q3 = p[3*step]; 540 if ((2 * abs0[255 + p0 - q0] + abs1[255 + p1 - q1]) > t) 541 return 0; 542 return abs0[255 + p3 - p2] <= it && abs0[255 + p2 - p1] <= it && 543 abs0[255 + p1 - p0] <= it && abs0[255 + q3 - q2] <= it && 544 abs0[255 + q2 - q1] <= it && abs0[255 + q1 - q0] <= it; 545} 546 547//------------------------------------------------------------------------------ 548// Simple In-loop filtering (Paragraph 15.2) 549 550static void SimpleVFilter16(uint8_t* p, int stride, int thresh) { 551 int i; 552 for (i = 0; i < 16; ++i) { 553 if (needs_filter(p + i, stride, thresh)) { 554 do_filter2(p + i, stride); 555 } 556 } 557} 558 559static void SimpleHFilter16(uint8_t* p, int stride, int thresh) { 560 int i; 561 for (i = 0; i < 16; ++i) { 562 if (needs_filter(p + i * stride, 1, thresh)) { 563 do_filter2(p + i * stride, 1); 564 } 565 } 566} 567 568static void SimpleVFilter16i(uint8_t* p, int stride, int thresh) { 569 int k; 570 for (k = 3; k > 0; --k) { 571 p += 4 * stride; 572 SimpleVFilter16(p, stride, thresh); 573 } 574} 575 576static void SimpleHFilter16i(uint8_t* p, int stride, int thresh) { 577 int k; 578 for (k = 3; k > 0; --k) { 579 p += 4; 580 SimpleHFilter16(p, stride, thresh); 581 } 582} 583 584//------------------------------------------------------------------------------ 585// Complex In-loop filtering (Paragraph 15.3) 586 587static WEBP_INLINE void FilterLoop26(uint8_t* p, 588 int hstride, int vstride, int size, 589 int thresh, int ithresh, int hev_thresh) { 590 while (size-- > 0) { 591 if (needs_filter2(p, hstride, thresh, ithresh)) { 592 if (hev(p, hstride, hev_thresh)) { 593 do_filter2(p, hstride); 594 } else { 595 do_filter6(p, hstride); 596 } 597 } 598 p += vstride; 599 } 600} 601 602static WEBP_INLINE void FilterLoop24(uint8_t* p, 603 int hstride, int vstride, int size, 604 int thresh, int ithresh, int hev_thresh) { 605 while (size-- > 0) { 606 if (needs_filter2(p, hstride, thresh, ithresh)) { 607 if (hev(p, hstride, hev_thresh)) { 608 do_filter2(p, hstride); 609 } else { 610 do_filter4(p, hstride); 611 } 612 } 613 p += vstride; 614 } 615} 616 617// on macroblock edges 618static void VFilter16(uint8_t* p, int stride, 619 int thresh, int ithresh, int hev_thresh) { 620 FilterLoop26(p, stride, 1, 16, thresh, ithresh, hev_thresh); 621} 622 623static void HFilter16(uint8_t* p, int stride, 624 int thresh, int ithresh, int hev_thresh) { 625 FilterLoop26(p, 1, stride, 16, thresh, ithresh, hev_thresh); 626} 627 628// on three inner edges 629static void VFilter16i(uint8_t* p, int stride, 630 int thresh, int ithresh, int hev_thresh) { 631 int k; 632 for (k = 3; k > 0; --k) { 633 p += 4 * stride; 634 FilterLoop24(p, stride, 1, 16, thresh, ithresh, hev_thresh); 635 } 636} 637 638static void HFilter16i(uint8_t* p, int stride, 639 int thresh, int ithresh, int hev_thresh) { 640 int k; 641 for (k = 3; k > 0; --k) { 642 p += 4; 643 FilterLoop24(p, 1, stride, 16, thresh, ithresh, hev_thresh); 644 } 645} 646 647// 8-pixels wide variant, for chroma filtering 648static void VFilter8(uint8_t* u, uint8_t* v, int stride, 649 int thresh, int ithresh, int hev_thresh) { 650 FilterLoop26(u, stride, 1, 8, thresh, ithresh, hev_thresh); 651 FilterLoop26(v, stride, 1, 8, thresh, ithresh, hev_thresh); 652} 653 654static void HFilter8(uint8_t* u, uint8_t* v, int stride, 655 int thresh, int ithresh, int hev_thresh) { 656 FilterLoop26(u, 1, stride, 8, thresh, ithresh, hev_thresh); 657 FilterLoop26(v, 1, stride, 8, thresh, ithresh, hev_thresh); 658} 659 660static void VFilter8i(uint8_t* u, uint8_t* v, int stride, 661 int thresh, int ithresh, int hev_thresh) { 662 FilterLoop24(u + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh); 663 FilterLoop24(v + 4 * stride, stride, 1, 8, thresh, ithresh, hev_thresh); 664} 665 666static void HFilter8i(uint8_t* u, uint8_t* v, int stride, 667 int thresh, int ithresh, int hev_thresh) { 668 FilterLoop24(u + 4, 1, stride, 8, thresh, ithresh, hev_thresh); 669 FilterLoop24(v + 4, 1, stride, 8, thresh, ithresh, hev_thresh); 670} 671 672//------------------------------------------------------------------------------ 673 674VP8DecIdct2 VP8Transform; 675VP8DecIdct VP8TransformUV; 676VP8DecIdct VP8TransformDC; 677VP8DecIdct VP8TransformDCUV; 678 679VP8LumaFilterFunc VP8VFilter16; 680VP8LumaFilterFunc VP8HFilter16; 681VP8ChromaFilterFunc VP8VFilter8; 682VP8ChromaFilterFunc VP8HFilter8; 683VP8LumaFilterFunc VP8VFilter16i; 684VP8LumaFilterFunc VP8HFilter16i; 685VP8ChromaFilterFunc VP8VFilter8i; 686VP8ChromaFilterFunc VP8HFilter8i; 687VP8SimpleFilterFunc VP8SimpleVFilter16; 688VP8SimpleFilterFunc VP8SimpleHFilter16; 689VP8SimpleFilterFunc VP8SimpleVFilter16i; 690VP8SimpleFilterFunc VP8SimpleHFilter16i; 691 692extern void VP8DspInitSSE2(void); 693extern void VP8DspInitNEON(void); 694 695void VP8DspInit(void) { 696 DspInitTables(); 697 698 VP8Transform = TransformTwo; 699 VP8TransformUV = TransformUV; 700 VP8TransformDC = TransformDC; 701 VP8TransformDCUV = TransformDCUV; 702 703 VP8VFilter16 = VFilter16; 704 VP8HFilter16 = HFilter16; 705 VP8VFilter8 = VFilter8; 706 VP8HFilter8 = HFilter8; 707 VP8VFilter16i = VFilter16i; 708 VP8HFilter16i = HFilter16i; 709 VP8VFilter8i = VFilter8i; 710 VP8HFilter8i = HFilter8i; 711 VP8SimpleVFilter16 = SimpleVFilter16; 712 VP8SimpleHFilter16 = SimpleHFilter16; 713 VP8SimpleVFilter16i = SimpleVFilter16i; 714 VP8SimpleHFilter16i = SimpleHFilter16i; 715 716 // If defined, use CPUInfo() to overwrite some pointers with faster versions. 717 if (VP8GetCPUInfo) { 718#if defined(WEBP_USE_SSE2) 719 if (VP8GetCPUInfo(kSSE2)) { 720 VP8DspInitSSE2(); 721 } 722#elif defined(WEBP_USE_NEON) 723 if (VP8GetCPUInfo(kNEON)) { 724 VP8DspInitNEON(); 725 } 726#endif 727 } 728} 729 730#if defined(__cplusplus) || defined(c_plusplus) 731} // extern "C" 732#endif 733