1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <stdlib.h> 12 #include "loopfilter.h" 13 #include "onyxc_int.h" 14 15 typedef unsigned char uc; 16 17 static signed char vp8_signed_char_clamp(int t) { 18 t = (t < -128 ? -128 : t); 19 t = (t > 127 ? 127 : t); 20 return (signed char)t; 21 } 22 23 /* should we apply any filter at all ( 11111111 yes, 00000000 no) */ 24 static signed char vp8_filter_mask(uc limit, uc blimit, uc p3, uc p2, uc p1, 25 uc p0, uc q0, uc q1, uc q2, uc q3) { 26 signed char mask = 0; 27 mask |= (abs(p3 - p2) > limit); 28 mask |= (abs(p2 - p1) > limit); 29 mask |= (abs(p1 - p0) > limit); 30 mask |= (abs(q1 - q0) > limit); 31 mask |= (abs(q2 - q1) > limit); 32 mask |= (abs(q3 - q2) > limit); 33 mask |= (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 > blimit); 34 return mask - 1; 35 } 36 37 /* is there high variance internal edge ( 11111111 yes, 00000000 no) */ 38 static signed char vp8_hevmask(uc thresh, uc p1, uc p0, uc q0, uc q1) { 39 signed char hev = 0; 40 hev |= (abs(p1 - p0) > thresh) * -1; 41 hev |= (abs(q1 - q0) > thresh) * -1; 42 return hev; 43 } 44 45 static void vp8_filter(signed char mask, uc hev, uc *op1, uc *op0, uc *oq0, 46 uc *oq1) { 47 signed char ps0, qs0; 48 signed char ps1, qs1; 49 signed char filter_value, Filter1, Filter2; 50 signed char u; 51 52 ps1 = (signed char)*op1 ^ 0x80; 53 ps0 = (signed char)*op0 ^ 0x80; 54 qs0 = (signed char)*oq0 ^ 0x80; 55 qs1 = (signed char)*oq1 ^ 0x80; 56 57 /* add outer taps if we have high edge variance */ 58 filter_value = vp8_signed_char_clamp(ps1 - qs1); 59 filter_value &= hev; 60 61 /* inner taps */ 62 filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0)); 63 filter_value &= mask; 64 65 /* save bottom 3 bits so that we round one side +4 and the other +3 66 * if it equals 4 we'll set it to adjust by -1 to account for the fact 67 * we'd round it by 3 the other way 68 */ 69 Filter1 = vp8_signed_char_clamp(filter_value + 4); 70 Filter2 = vp8_signed_char_clamp(filter_value + 3); 71 Filter1 >>= 3; 72 Filter2 >>= 3; 73 u = vp8_signed_char_clamp(qs0 - Filter1); 74 *oq0 = u ^ 0x80; 75 u = vp8_signed_char_clamp(ps0 + Filter2); 76 *op0 = u ^ 0x80; 77 filter_value = Filter1; 78 79 /* outer tap adjustments */ 80 filter_value += 1; 81 filter_value >>= 1; 82 filter_value &= ~hev; 83 84 u = vp8_signed_char_clamp(qs1 - filter_value); 85 *oq1 = u ^ 0x80; 86 u = vp8_signed_char_clamp(ps1 + filter_value); 87 *op1 = u ^ 0x80; 88 } 89 90 static void loop_filter_horizontal_edge_c(unsigned char *s, int p, /* pitch */ 91 const unsigned char *blimit, 92 const unsigned char *limit, 93 const unsigned char *thresh, 94 int count) { 95 int hev = 0; /* high edge variance */ 96 signed char mask = 0; 97 int i = 0; 98 99 /* loop filter designed to work using chars so that we can make maximum use 100 * of 8 bit simd instructions. 101 */ 102 do { 103 mask = vp8_filter_mask(limit[0], blimit[0], s[-4 * p], s[-3 * p], s[-2 * p], 104 s[-1 * p], s[0 * p], s[1 * p], s[2 * p], s[3 * p]); 105 106 hev = vp8_hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]); 107 108 vp8_filter(mask, hev, s - 2 * p, s - 1 * p, s, s + 1 * p); 109 110 ++s; 111 } while (++i < count * 8); 112 } 113 114 static void loop_filter_vertical_edge_c(unsigned char *s, int p, 115 const unsigned char *blimit, 116 const unsigned char *limit, 117 const unsigned char *thresh, 118 int count) { 119 int hev = 0; /* high edge variance */ 120 signed char mask = 0; 121 int i = 0; 122 123 /* loop filter designed to work using chars so that we can make maximum use 124 * of 8 bit simd instructions. 125 */ 126 do { 127 mask = vp8_filter_mask(limit[0], blimit[0], s[-4], s[-3], s[-2], s[-1], 128 s[0], s[1], s[2], s[3]); 129 130 hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]); 131 132 vp8_filter(mask, hev, s - 2, s - 1, s, s + 1); 133 134 s += p; 135 } while (++i < count * 8); 136 } 137 138 static void vp8_mbfilter(signed char mask, uc hev, uc *op2, uc *op1, uc *op0, 139 uc *oq0, uc *oq1, uc *oq2) { 140 signed char s, u; 141 signed char filter_value, Filter1, Filter2; 142 signed char ps2 = (signed char)*op2 ^ 0x80; 143 signed char ps1 = (signed char)*op1 ^ 0x80; 144 signed char ps0 = (signed char)*op0 ^ 0x80; 145 signed char qs0 = (signed char)*oq0 ^ 0x80; 146 signed char qs1 = (signed char)*oq1 ^ 0x80; 147 signed char qs2 = (signed char)*oq2 ^ 0x80; 148 149 /* add outer taps if we have high edge variance */ 150 filter_value = vp8_signed_char_clamp(ps1 - qs1); 151 filter_value = vp8_signed_char_clamp(filter_value + 3 * (qs0 - ps0)); 152 filter_value &= mask; 153 154 Filter2 = filter_value; 155 Filter2 &= hev; 156 157 /* save bottom 3 bits so that we round one side +4 and the other +3 */ 158 Filter1 = vp8_signed_char_clamp(Filter2 + 4); 159 Filter2 = vp8_signed_char_clamp(Filter2 + 3); 160 Filter1 >>= 3; 161 Filter2 >>= 3; 162 qs0 = vp8_signed_char_clamp(qs0 - Filter1); 163 ps0 = vp8_signed_char_clamp(ps0 + Filter2); 164 165 /* only apply wider filter if not high edge variance */ 166 filter_value &= ~hev; 167 Filter2 = filter_value; 168 169 /* roughly 3/7th difference across boundary */ 170 u = vp8_signed_char_clamp((63 + Filter2 * 27) >> 7); 171 s = vp8_signed_char_clamp(qs0 - u); 172 *oq0 = s ^ 0x80; 173 s = vp8_signed_char_clamp(ps0 + u); 174 *op0 = s ^ 0x80; 175 176 /* roughly 2/7th difference across boundary */ 177 u = vp8_signed_char_clamp((63 + Filter2 * 18) >> 7); 178 s = vp8_signed_char_clamp(qs1 - u); 179 *oq1 = s ^ 0x80; 180 s = vp8_signed_char_clamp(ps1 + u); 181 *op1 = s ^ 0x80; 182 183 /* roughly 1/7th difference across boundary */ 184 u = vp8_signed_char_clamp((63 + Filter2 * 9) >> 7); 185 s = vp8_signed_char_clamp(qs2 - u); 186 *oq2 = s ^ 0x80; 187 s = vp8_signed_char_clamp(ps2 + u); 188 *op2 = s ^ 0x80; 189 } 190 191 static void mbloop_filter_horizontal_edge_c(unsigned char *s, int p, 192 const unsigned char *blimit, 193 const unsigned char *limit, 194 const unsigned char *thresh, 195 int count) { 196 signed char hev = 0; /* high edge variance */ 197 signed char mask = 0; 198 int i = 0; 199 200 /* loop filter designed to work using chars so that we can make maximum use 201 * of 8 bit simd instructions. 202 */ 203 do { 204 mask = vp8_filter_mask(limit[0], blimit[0], s[-4 * p], s[-3 * p], s[-2 * p], 205 s[-1 * p], s[0 * p], s[1 * p], s[2 * p], s[3 * p]); 206 207 hev = vp8_hevmask(thresh[0], s[-2 * p], s[-1 * p], s[0 * p], s[1 * p]); 208 209 vp8_mbfilter(mask, hev, s - 3 * p, s - 2 * p, s - 1 * p, s, s + 1 * p, 210 s + 2 * p); 211 212 ++s; 213 } while (++i < count * 8); 214 } 215 216 static void mbloop_filter_vertical_edge_c(unsigned char *s, int p, 217 const unsigned char *blimit, 218 const unsigned char *limit, 219 const unsigned char *thresh, 220 int count) { 221 signed char hev = 0; /* high edge variance */ 222 signed char mask = 0; 223 int i = 0; 224 225 do { 226 mask = vp8_filter_mask(limit[0], blimit[0], s[-4], s[-3], s[-2], s[-1], 227 s[0], s[1], s[2], s[3]); 228 229 hev = vp8_hevmask(thresh[0], s[-2], s[-1], s[0], s[1]); 230 231 vp8_mbfilter(mask, hev, s - 3, s - 2, s - 1, s, s + 1, s + 2); 232 233 s += p; 234 } while (++i < count * 8); 235 } 236 237 /* should we apply any filter at all ( 11111111 yes, 00000000 no) */ 238 static signed char vp8_simple_filter_mask(uc blimit, uc p1, uc p0, uc q0, 239 uc q1) { 240 /* Why does this cause problems for win32? 241 * error C2143: syntax error : missing ';' before 'type' 242 * (void) limit; 243 */ 244 signed char mask = (abs(p0 - q0) * 2 + abs(p1 - q1) / 2 <= blimit) * -1; 245 return mask; 246 } 247 248 static void vp8_simple_filter(signed char mask, uc *op1, uc *op0, uc *oq0, 249 uc *oq1) { 250 signed char filter_value, Filter1, Filter2; 251 signed char p1 = (signed char)*op1 ^ 0x80; 252 signed char p0 = (signed char)*op0 ^ 0x80; 253 signed char q0 = (signed char)*oq0 ^ 0x80; 254 signed char q1 = (signed char)*oq1 ^ 0x80; 255 signed char u; 256 257 filter_value = vp8_signed_char_clamp(p1 - q1); 258 filter_value = vp8_signed_char_clamp(filter_value + 3 * (q0 - p0)); 259 filter_value &= mask; 260 261 /* save bottom 3 bits so that we round one side +4 and the other +3 */ 262 Filter1 = vp8_signed_char_clamp(filter_value + 4); 263 Filter1 >>= 3; 264 u = vp8_signed_char_clamp(q0 - Filter1); 265 *oq0 = u ^ 0x80; 266 267 Filter2 = vp8_signed_char_clamp(filter_value + 3); 268 Filter2 >>= 3; 269 u = vp8_signed_char_clamp(p0 + Filter2); 270 *op0 = u ^ 0x80; 271 } 272 273 void vp8_loop_filter_simple_horizontal_edge_c(unsigned char *s, int p, 274 const unsigned char *blimit) { 275 signed char mask = 0; 276 int i = 0; 277 278 do { 279 mask = vp8_simple_filter_mask(blimit[0], s[-2 * p], s[-1 * p], s[0 * p], 280 s[1 * p]); 281 vp8_simple_filter(mask, s - 2 * p, s - 1 * p, s, s + 1 * p); 282 ++s; 283 } while (++i < 16); 284 } 285 286 void vp8_loop_filter_simple_vertical_edge_c(unsigned char *s, int p, 287 const unsigned char *blimit) { 288 signed char mask = 0; 289 int i = 0; 290 291 do { 292 mask = vp8_simple_filter_mask(blimit[0], s[-2], s[-1], s[0], s[1]); 293 vp8_simple_filter(mask, s - 2, s - 1, s, s + 1); 294 s += p; 295 } while (++i < 16); 296 } 297 298 /* Horizontal MB filtering */ 299 void vp8_loop_filter_mbh_c(unsigned char *y_ptr, unsigned char *u_ptr, 300 unsigned char *v_ptr, int y_stride, int uv_stride, 301 loop_filter_info *lfi) { 302 mbloop_filter_horizontal_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim, 303 lfi->hev_thr, 2); 304 305 if (u_ptr) { 306 mbloop_filter_horizontal_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim, 307 lfi->hev_thr, 1); 308 } 309 310 if (v_ptr) { 311 mbloop_filter_horizontal_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim, 312 lfi->hev_thr, 1); 313 } 314 } 315 316 /* Vertical MB Filtering */ 317 void vp8_loop_filter_mbv_c(unsigned char *y_ptr, unsigned char *u_ptr, 318 unsigned char *v_ptr, int y_stride, int uv_stride, 319 loop_filter_info *lfi) { 320 mbloop_filter_vertical_edge_c(y_ptr, y_stride, lfi->mblim, lfi->lim, 321 lfi->hev_thr, 2); 322 323 if (u_ptr) { 324 mbloop_filter_vertical_edge_c(u_ptr, uv_stride, lfi->mblim, lfi->lim, 325 lfi->hev_thr, 1); 326 } 327 328 if (v_ptr) { 329 mbloop_filter_vertical_edge_c(v_ptr, uv_stride, lfi->mblim, lfi->lim, 330 lfi->hev_thr, 1); 331 } 332 } 333 334 /* Horizontal B Filtering */ 335 void vp8_loop_filter_bh_c(unsigned char *y_ptr, unsigned char *u_ptr, 336 unsigned char *v_ptr, int y_stride, int uv_stride, 337 loop_filter_info *lfi) { 338 loop_filter_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, lfi->blim, 339 lfi->lim, lfi->hev_thr, 2); 340 loop_filter_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, lfi->blim, 341 lfi->lim, lfi->hev_thr, 2); 342 loop_filter_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, lfi->blim, 343 lfi->lim, lfi->hev_thr, 2); 344 345 if (u_ptr) { 346 loop_filter_horizontal_edge_c(u_ptr + 4 * uv_stride, uv_stride, lfi->blim, 347 lfi->lim, lfi->hev_thr, 1); 348 } 349 350 if (v_ptr) { 351 loop_filter_horizontal_edge_c(v_ptr + 4 * uv_stride, uv_stride, lfi->blim, 352 lfi->lim, lfi->hev_thr, 1); 353 } 354 } 355 356 void vp8_loop_filter_bhs_c(unsigned char *y_ptr, int y_stride, 357 const unsigned char *blimit) { 358 vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, 359 blimit); 360 vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, 361 blimit); 362 vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, 363 blimit); 364 } 365 366 /* Vertical B Filtering */ 367 void vp8_loop_filter_bv_c(unsigned char *y_ptr, unsigned char *u_ptr, 368 unsigned char *v_ptr, int y_stride, int uv_stride, 369 loop_filter_info *lfi) { 370 loop_filter_vertical_edge_c(y_ptr + 4, y_stride, lfi->blim, lfi->lim, 371 lfi->hev_thr, 2); 372 loop_filter_vertical_edge_c(y_ptr + 8, y_stride, lfi->blim, lfi->lim, 373 lfi->hev_thr, 2); 374 loop_filter_vertical_edge_c(y_ptr + 12, y_stride, lfi->blim, lfi->lim, 375 lfi->hev_thr, 2); 376 377 if (u_ptr) { 378 loop_filter_vertical_edge_c(u_ptr + 4, uv_stride, lfi->blim, lfi->lim, 379 lfi->hev_thr, 1); 380 } 381 382 if (v_ptr) { 383 loop_filter_vertical_edge_c(v_ptr + 4, uv_stride, lfi->blim, lfi->lim, 384 lfi->hev_thr, 1); 385 } 386 } 387 388 void vp8_loop_filter_bvs_c(unsigned char *y_ptr, int y_stride, 389 const unsigned char *blimit) { 390 vp8_loop_filter_simple_vertical_edge_c(y_ptr + 4, y_stride, blimit); 391 vp8_loop_filter_simple_vertical_edge_c(y_ptr + 8, y_stride, blimit); 392 vp8_loop_filter_simple_vertical_edge_c(y_ptr + 12, y_stride, blimit); 393 } 394
