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 12 #include "./vpx_scale_rtcd.h" 13 #include "vp8/common/onyxc_int.h" 14 #include "onyx_int.h" 15 #include "quantize.h" 16 #include "vpx_mem/vpx_mem.h" 17 #include "vpx_scale/vpx_scale.h" 18 #include "vp8/common/alloccommon.h" 19 #include "vp8/common/loopfilter.h" 20 #if ARCH_ARM 21 #include "vpx_ports/arm.h" 22 #endif 23 24 extern int vp8_calc_ss_err(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest); 25 26 void vp8_yv12_copy_partial_frame_c(YV12_BUFFER_CONFIG *src_ybc, 27 YV12_BUFFER_CONFIG *dst_ybc) 28 { 29 unsigned char *src_y, *dst_y; 30 int yheight; 31 int ystride; 32 int yoffset; 33 int linestocopy; 34 35 yheight = src_ybc->y_height; 36 ystride = src_ybc->y_stride; 37 38 /* number of MB rows to use in partial filtering */ 39 linestocopy = (yheight >> 4) / PARTIAL_FRAME_FRACTION; 40 linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */ 41 42 /* Copy extra 4 so that full filter context is available if filtering done 43 * on the copied partial frame and not original. Partial filter does mb 44 * filtering for top row also, which can modify3 pixels above. 45 */ 46 linestocopy += 4; 47 /* partial image starts at ~middle of frame (macroblock border)*/ 48 yoffset = ystride * (((yheight >> 5) * 16) - 4); 49 src_y = src_ybc->y_buffer + yoffset; 50 dst_y = dst_ybc->y_buffer + yoffset; 51 52 vpx_memcpy(dst_y, src_y, ystride * linestocopy); 53 } 54 55 static int calc_partial_ssl_err(YV12_BUFFER_CONFIG *source, 56 YV12_BUFFER_CONFIG *dest) 57 { 58 int i, j; 59 int Total = 0; 60 int srcoffset, dstoffset; 61 unsigned char *src = source->y_buffer; 62 unsigned char *dst = dest->y_buffer; 63 64 int linestocopy; 65 66 /* number of MB rows to use in partial filtering */ 67 linestocopy = (source->y_height >> 4) / PARTIAL_FRAME_FRACTION; 68 linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */ 69 70 71 /* partial image starts at ~middle of frame (macroblock border)*/ 72 srcoffset = source->y_stride * ((dest->y_height >> 5) * 16); 73 dstoffset = dest->y_stride * ((dest->y_height >> 5) * 16); 74 75 src += srcoffset; 76 dst += dstoffset; 77 78 /* Loop through the Y plane raw and reconstruction data summing 79 * (square differences) 80 */ 81 for (i = 0; i < linestocopy; i += 16) 82 { 83 for (j = 0; j < source->y_width; j += 16) 84 { 85 unsigned int sse; 86 Total += vp8_mse16x16(src + j, source->y_stride, 87 dst + j, dest->y_stride, 88 &sse); 89 } 90 91 src += 16 * source->y_stride; 92 dst += 16 * dest->y_stride; 93 } 94 95 return Total; 96 } 97 98 /* Enforce a minimum filter level based upon baseline Q */ 99 static int get_min_filter_level(VP8_COMP *cpi, int base_qindex) 100 { 101 int min_filter_level; 102 103 if (cpi->source_alt_ref_active && cpi->common.refresh_golden_frame && 104 !cpi->common.refresh_alt_ref_frame) 105 min_filter_level = 0; 106 else 107 { 108 if (base_qindex <= 6) 109 min_filter_level = 0; 110 else if (base_qindex <= 16) 111 min_filter_level = 1; 112 else 113 min_filter_level = (base_qindex / 8); 114 } 115 116 return min_filter_level; 117 } 118 119 /* Enforce a maximum filter level based upon baseline Q */ 120 static int get_max_filter_level(VP8_COMP *cpi, int base_qindex) 121 { 122 /* PGW August 2006: Highest filter values almost always a bad idea */ 123 124 /* jbb chg: 20100118 - not so any more with this overquant stuff allow 125 * high values with lots of intra coming in. 126 */ 127 int max_filter_level = MAX_LOOP_FILTER; 128 (void)base_qindex; 129 130 if (cpi->twopass.section_intra_rating > 8) 131 max_filter_level = MAX_LOOP_FILTER * 3 / 4; 132 133 return max_filter_level; 134 } 135 136 void vp8cx_pick_filter_level_fast(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi) 137 { 138 VP8_COMMON *cm = &cpi->common; 139 140 int best_err = 0; 141 int filt_err = 0; 142 int min_filter_level = get_min_filter_level(cpi, cm->base_qindex); 143 int max_filter_level = get_max_filter_level(cpi, cm->base_qindex); 144 int filt_val; 145 int best_filt_val = cm->filter_level; 146 YV12_BUFFER_CONFIG * saved_frame = cm->frame_to_show; 147 148 /* Replace unfiltered frame buffer with a new one */ 149 cm->frame_to_show = &cpi->pick_lf_lvl_frame; 150 151 if (cm->frame_type == KEY_FRAME) 152 cm->sharpness_level = 0; 153 else 154 cm->sharpness_level = cpi->oxcf.Sharpness; 155 156 if (cm->sharpness_level != cm->last_sharpness_level) 157 { 158 vp8_loop_filter_update_sharpness(&cm->lf_info, cm->sharpness_level); 159 cm->last_sharpness_level = cm->sharpness_level; 160 } 161 162 /* Start the search at the previous frame filter level unless it is 163 * now out of range. 164 */ 165 if (cm->filter_level < min_filter_level) 166 cm->filter_level = min_filter_level; 167 else if (cm->filter_level > max_filter_level) 168 cm->filter_level = max_filter_level; 169 170 filt_val = cm->filter_level; 171 best_filt_val = filt_val; 172 173 /* Get the err using the previous frame's filter value. */ 174 175 /* Copy the unfiltered / processed recon buffer to the new buffer */ 176 vp8_yv12_copy_partial_frame(saved_frame, cm->frame_to_show); 177 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); 178 179 best_err = calc_partial_ssl_err(sd, cm->frame_to_show); 180 181 filt_val -= 1 + (filt_val > 10); 182 183 /* Search lower filter levels */ 184 while (filt_val >= min_filter_level) 185 { 186 /* Apply the loop filter */ 187 vp8_yv12_copy_partial_frame(saved_frame, cm->frame_to_show); 188 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); 189 190 /* Get the err for filtered frame */ 191 filt_err = calc_partial_ssl_err(sd, cm->frame_to_show); 192 193 /* Update the best case record or exit loop. */ 194 if (filt_err < best_err) 195 { 196 best_err = filt_err; 197 best_filt_val = filt_val; 198 } 199 else 200 break; 201 202 /* Adjust filter level */ 203 filt_val -= 1 + (filt_val > 10); 204 } 205 206 /* Search up (note that we have already done filt_val = cm->filter_level) */ 207 filt_val = cm->filter_level + 1 + (filt_val > 10); 208 209 if (best_filt_val == cm->filter_level) 210 { 211 /* Resist raising filter level for very small gains */ 212 best_err -= (best_err >> 10); 213 214 while (filt_val < max_filter_level) 215 { 216 /* Apply the loop filter */ 217 vp8_yv12_copy_partial_frame(saved_frame, cm->frame_to_show); 218 219 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); 220 221 /* Get the err for filtered frame */ 222 filt_err = calc_partial_ssl_err(sd, cm->frame_to_show); 223 224 /* Update the best case record or exit loop. */ 225 if (filt_err < best_err) 226 { 227 /* Do not raise filter level if improvement is < 1 part 228 * in 4096 229 */ 230 best_err = filt_err - (filt_err >> 10); 231 232 best_filt_val = filt_val; 233 } 234 else 235 break; 236 237 /* Adjust filter level */ 238 filt_val += 1 + (filt_val > 10); 239 } 240 } 241 242 cm->filter_level = best_filt_val; 243 244 if (cm->filter_level < min_filter_level) 245 cm->filter_level = min_filter_level; 246 247 if (cm->filter_level > max_filter_level) 248 cm->filter_level = max_filter_level; 249 250 /* restore unfiltered frame pointer */ 251 cm->frame_to_show = saved_frame; 252 } 253 254 /* Stub function for now Alt LF not used */ 255 void vp8cx_set_alt_lf_level(VP8_COMP *cpi, int filt_val) 256 { 257 MACROBLOCKD *mbd = &cpi->mb.e_mbd; 258 (void) filt_val; 259 260 mbd->segment_feature_data[MB_LVL_ALT_LF][0] = cpi->segment_feature_data[MB_LVL_ALT_LF][0]; 261 mbd->segment_feature_data[MB_LVL_ALT_LF][1] = cpi->segment_feature_data[MB_LVL_ALT_LF][1]; 262 mbd->segment_feature_data[MB_LVL_ALT_LF][2] = cpi->segment_feature_data[MB_LVL_ALT_LF][2]; 263 mbd->segment_feature_data[MB_LVL_ALT_LF][3] = cpi->segment_feature_data[MB_LVL_ALT_LF][3]; 264 } 265 266 void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi) 267 { 268 VP8_COMMON *cm = &cpi->common; 269 270 int best_err = 0; 271 int filt_err = 0; 272 int min_filter_level = get_min_filter_level(cpi, cm->base_qindex); 273 int max_filter_level = get_max_filter_level(cpi, cm->base_qindex); 274 275 int filter_step; 276 int filt_high = 0; 277 /* Start search at previous frame filter level */ 278 int filt_mid = cm->filter_level; 279 int filt_low = 0; 280 int filt_best; 281 int filt_direction = 0; 282 283 /* Bias against raising loop filter and in favor of lowering it */ 284 int Bias = 0; 285 286 int ss_err[MAX_LOOP_FILTER + 1]; 287 288 YV12_BUFFER_CONFIG * saved_frame = cm->frame_to_show; 289 290 vpx_memset(ss_err, 0, sizeof(ss_err)); 291 292 /* Replace unfiltered frame buffer with a new one */ 293 cm->frame_to_show = &cpi->pick_lf_lvl_frame; 294 295 if (cm->frame_type == KEY_FRAME) 296 cm->sharpness_level = 0; 297 else 298 cm->sharpness_level = cpi->oxcf.Sharpness; 299 300 /* Start the search at the previous frame filter level unless it is 301 * now out of range. 302 */ 303 filt_mid = cm->filter_level; 304 305 if (filt_mid < min_filter_level) 306 filt_mid = min_filter_level; 307 else if (filt_mid > max_filter_level) 308 filt_mid = max_filter_level; 309 310 /* Define the initial step size */ 311 filter_step = (filt_mid < 16) ? 4 : filt_mid / 4; 312 313 /* Get baseline error score */ 314 315 /* Copy the unfiltered / processed recon buffer to the new buffer */ 316 vpx_yv12_copy_y(saved_frame, cm->frame_to_show); 317 318 vp8cx_set_alt_lf_level(cpi, filt_mid); 319 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_mid); 320 321 best_err = vp8_calc_ss_err(sd, cm->frame_to_show); 322 323 ss_err[filt_mid] = best_err; 324 325 filt_best = filt_mid; 326 327 while (filter_step > 0) 328 { 329 Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step; 330 331 if (cpi->twopass.section_intra_rating < 20) 332 Bias = Bias * cpi->twopass.section_intra_rating / 20; 333 334 filt_high = ((filt_mid + filter_step) > max_filter_level) ? max_filter_level : (filt_mid + filter_step); 335 filt_low = ((filt_mid - filter_step) < min_filter_level) ? min_filter_level : (filt_mid - filter_step); 336 337 if ((filt_direction <= 0) && (filt_low != filt_mid)) 338 { 339 if(ss_err[filt_low] == 0) 340 { 341 /* Get Low filter error score */ 342 vpx_yv12_copy_y(saved_frame, cm->frame_to_show); 343 vp8cx_set_alt_lf_level(cpi, filt_low); 344 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low); 345 346 filt_err = vp8_calc_ss_err(sd, cm->frame_to_show); 347 ss_err[filt_low] = filt_err; 348 } 349 else 350 filt_err = ss_err[filt_low]; 351 352 /* If value is close to the best so far then bias towards a 353 * lower loop filter value. 354 */ 355 if ((filt_err - Bias) < best_err) 356 { 357 /* Was it actually better than the previous best? */ 358 if (filt_err < best_err) 359 best_err = filt_err; 360 361 filt_best = filt_low; 362 } 363 } 364 365 /* Now look at filt_high */ 366 if ((filt_direction >= 0) && (filt_high != filt_mid)) 367 { 368 if(ss_err[filt_high] == 0) 369 { 370 vpx_yv12_copy_y(saved_frame, cm->frame_to_show); 371 vp8cx_set_alt_lf_level(cpi, filt_high); 372 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high); 373 374 filt_err = vp8_calc_ss_err(sd, cm->frame_to_show); 375 ss_err[filt_high] = filt_err; 376 } 377 else 378 filt_err = ss_err[filt_high]; 379 380 /* Was it better than the previous best? */ 381 if (filt_err < (best_err - Bias)) 382 { 383 best_err = filt_err; 384 filt_best = filt_high; 385 } 386 } 387 388 /* Half the step distance if the best filter value was the same 389 * as last time 390 */ 391 if (filt_best == filt_mid) 392 { 393 filter_step = filter_step / 2; 394 filt_direction = 0; 395 } 396 else 397 { 398 filt_direction = (filt_best < filt_mid) ? -1 : 1; 399 filt_mid = filt_best; 400 } 401 } 402 403 cm->filter_level = filt_best; 404 405 /* restore unfiltered frame pointer */ 406 cm->frame_to_show = saved_frame; 407 } 408
