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 "./vpx_dsp_rtcd.h" 12 #include "./vpx_scale_rtcd.h" 13 #include "vp8/common/onyxc_int.h" 14 #include "onyx_int.h" 15 #include "vp8/encoder/picklpf.h" 16 #include "vp8/encoder/quantize.h" 17 #include "vpx_mem/vpx_mem.h" 18 #include "vpx_scale/vpx_scale.h" 19 #include "vp8/common/alloccommon.h" 20 #include "vp8/common/loopfilter.h" 21 #if ARCH_ARM 22 #include "vpx_ports/arm.h" 23 #endif 24 25 extern int vp8_calc_ss_err(YV12_BUFFER_CONFIG *source, 26 YV12_BUFFER_CONFIG *dest); 27 28 static void yv12_copy_partial_frame(YV12_BUFFER_CONFIG *src_ybc, 29 YV12_BUFFER_CONFIG *dst_ybc) { 30 unsigned char *src_y, *dst_y; 31 int yheight; 32 int ystride; 33 int yoffset; 34 int linestocopy; 35 36 yheight = src_ybc->y_height; 37 ystride = src_ybc->y_stride; 38 39 /* number of MB rows to use in partial filtering */ 40 linestocopy = (yheight >> 4) / PARTIAL_FRAME_FRACTION; 41 linestocopy = linestocopy ? linestocopy << 4 : 16; /* 16 lines per MB */ 42 43 /* Copy extra 4 so that full filter context is available if filtering done 44 * on the copied partial frame and not original. Partial filter does mb 45 * filtering for top row also, which can modify3 pixels above. 46 */ 47 linestocopy += 4; 48 /* partial image starts at ~middle of frame (macroblock border)*/ 49 yoffset = ystride * (((yheight >> 5) * 16) - 4); 50 src_y = src_ybc->y_buffer + yoffset; 51 dst_y = dst_ybc->y_buffer + yoffset; 52 53 memcpy(dst_y, src_y, ystride * linestocopy); 54 } 55 56 static int calc_partial_ssl_err(YV12_BUFFER_CONFIG *source, 57 YV12_BUFFER_CONFIG *dest) { 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 /* partial image starts at ~middle of frame (macroblock border)*/ 71 srcoffset = source->y_stride * ((dest->y_height >> 5) * 16); 72 dstoffset = dest->y_stride * ((dest->y_height >> 5) * 16); 73 74 src += srcoffset; 75 dst += dstoffset; 76 77 /* Loop through the Y plane raw and reconstruction data summing 78 * (square differences) 79 */ 80 for (i = 0; i < linestocopy; i += 16) { 81 for (j = 0; j < source->y_width; j += 16) { 82 unsigned int sse; 83 Total += vpx_mse16x16(src + j, source->y_stride, dst + j, dest->y_stride, 84 &sse); 85 } 86 87 src += 16 * source->y_stride; 88 dst += 16 * dest->y_stride; 89 } 90 91 return Total; 92 } 93 94 /* Enforce a minimum filter level based upon baseline Q */ 95 static int get_min_filter_level(VP8_COMP *cpi, int base_qindex) { 96 int min_filter_level; 97 98 if (cpi->source_alt_ref_active && cpi->common.refresh_golden_frame && 99 !cpi->common.refresh_alt_ref_frame) { 100 min_filter_level = 0; 101 } else { 102 if (base_qindex <= 6) { 103 min_filter_level = 0; 104 } else if (base_qindex <= 16) { 105 min_filter_level = 1; 106 } else { 107 min_filter_level = (base_qindex / 8); 108 } 109 } 110 111 return min_filter_level; 112 } 113 114 /* Enforce a maximum filter level based upon baseline Q */ 115 static int get_max_filter_level(VP8_COMP *cpi, int base_qindex) { 116 /* PGW August 2006: Highest filter values almost always a bad idea */ 117 118 /* jbb chg: 20100118 - not so any more with this overquant stuff allow 119 * high values with lots of intra coming in. 120 */ 121 int max_filter_level = MAX_LOOP_FILTER; 122 (void)base_qindex; 123 124 if (cpi->twopass.section_intra_rating > 8) { 125 max_filter_level = MAX_LOOP_FILTER * 3 / 4; 126 } 127 128 return max_filter_level; 129 } 130 131 void vp8cx_pick_filter_level_fast(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi) { 132 VP8_COMMON *cm = &cpi->common; 133 134 int best_err = 0; 135 int filt_err = 0; 136 int min_filter_level = get_min_filter_level(cpi, cm->base_qindex); 137 int max_filter_level = get_max_filter_level(cpi, cm->base_qindex); 138 int filt_val; 139 int best_filt_val; 140 YV12_BUFFER_CONFIG *saved_frame = cm->frame_to_show; 141 142 /* Replace unfiltered frame buffer with a new one */ 143 cm->frame_to_show = &cpi->pick_lf_lvl_frame; 144 145 if (cm->frame_type == KEY_FRAME) { 146 cm->sharpness_level = 0; 147 } else { 148 cm->sharpness_level = cpi->oxcf.Sharpness; 149 } 150 151 if (cm->sharpness_level != cm->last_sharpness_level) { 152 vp8_loop_filter_update_sharpness(&cm->lf_info, cm->sharpness_level); 153 cm->last_sharpness_level = cm->sharpness_level; 154 } 155 156 /* Start the search at the previous frame filter level unless it is 157 * now out of range. 158 */ 159 if (cm->filter_level < min_filter_level) { 160 cm->filter_level = min_filter_level; 161 } else if (cm->filter_level > max_filter_level) { 162 cm->filter_level = max_filter_level; 163 } 164 165 filt_val = cm->filter_level; 166 best_filt_val = filt_val; 167 168 /* Get the err using the previous frame's filter value. */ 169 170 /* Copy the unfiltered / processed recon buffer to the new buffer */ 171 yv12_copy_partial_frame(saved_frame, cm->frame_to_show); 172 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); 173 174 best_err = calc_partial_ssl_err(sd, cm->frame_to_show); 175 176 filt_val -= 1 + (filt_val > 10); 177 178 /* Search lower filter levels */ 179 while (filt_val >= min_filter_level) { 180 /* Apply the loop filter */ 181 yv12_copy_partial_frame(saved_frame, cm->frame_to_show); 182 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); 183 184 /* Get the err for filtered frame */ 185 filt_err = calc_partial_ssl_err(sd, cm->frame_to_show); 186 187 /* Update the best case record or exit loop. */ 188 if (filt_err < best_err) { 189 best_err = filt_err; 190 best_filt_val = filt_val; 191 } else { 192 break; 193 } 194 195 /* Adjust filter level */ 196 filt_val -= 1 + (filt_val > 10); 197 } 198 199 /* Search up (note that we have already done filt_val = cm->filter_level) */ 200 filt_val = cm->filter_level + 1 + (filt_val > 10); 201 202 if (best_filt_val == cm->filter_level) { 203 /* Resist raising filter level for very small gains */ 204 best_err -= (best_err >> 10); 205 206 while (filt_val < max_filter_level) { 207 /* Apply the loop filter */ 208 yv12_copy_partial_frame(saved_frame, cm->frame_to_show); 209 210 vp8_loop_filter_partial_frame(cm, &cpi->mb.e_mbd, filt_val); 211 212 /* Get the err for filtered frame */ 213 filt_err = calc_partial_ssl_err(sd, cm->frame_to_show); 214 215 /* Update the best case record or exit loop. */ 216 if (filt_err < best_err) { 217 /* Do not raise filter level if improvement is < 1 part 218 * in 4096 219 */ 220 best_err = filt_err - (filt_err >> 10); 221 222 best_filt_val = filt_val; 223 } else { 224 break; 225 } 226 227 /* Adjust filter level */ 228 filt_val += 1 + (filt_val > 10); 229 } 230 } 231 232 cm->filter_level = best_filt_val; 233 234 if (cm->filter_level < min_filter_level) cm->filter_level = min_filter_level; 235 236 if (cm->filter_level > max_filter_level) cm->filter_level = max_filter_level; 237 238 /* restore unfiltered frame pointer */ 239 cm->frame_to_show = saved_frame; 240 } 241 242 /* Stub function for now Alt LF not used */ 243 void vp8cx_set_alt_lf_level(VP8_COMP *cpi, int filt_val) { 244 MACROBLOCKD *mbd = &cpi->mb.e_mbd; 245 (void)filt_val; 246 247 mbd->segment_feature_data[MB_LVL_ALT_LF][0] = 248 cpi->segment_feature_data[MB_LVL_ALT_LF][0]; 249 mbd->segment_feature_data[MB_LVL_ALT_LF][1] = 250 cpi->segment_feature_data[MB_LVL_ALT_LF][1]; 251 mbd->segment_feature_data[MB_LVL_ALT_LF][2] = 252 cpi->segment_feature_data[MB_LVL_ALT_LF][2]; 253 mbd->segment_feature_data[MB_LVL_ALT_LF][3] = 254 cpi->segment_feature_data[MB_LVL_ALT_LF][3]; 255 } 256 257 void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi) { 258 VP8_COMMON *cm = &cpi->common; 259 260 int best_err = 0; 261 int filt_err = 0; 262 int min_filter_level = get_min_filter_level(cpi, cm->base_qindex); 263 int max_filter_level = get_max_filter_level(cpi, cm->base_qindex); 264 265 int filter_step; 266 int filt_high = 0; 267 int filt_mid; 268 int filt_low = 0; 269 int filt_best; 270 int filt_direction = 0; 271 272 /* Bias against raising loop filter and in favor of lowering it */ 273 int Bias = 0; 274 275 int ss_err[MAX_LOOP_FILTER + 1]; 276 277 YV12_BUFFER_CONFIG *saved_frame = cm->frame_to_show; 278 279 memset(ss_err, 0, sizeof(ss_err)); 280 281 /* Replace unfiltered frame buffer with a new one */ 282 cm->frame_to_show = &cpi->pick_lf_lvl_frame; 283 284 if (cm->frame_type == KEY_FRAME) { 285 cm->sharpness_level = 0; 286 } else { 287 cm->sharpness_level = cpi->oxcf.Sharpness; 288 } 289 290 /* Start the search at the previous frame filter level unless it is 291 * now out of range. 292 */ 293 filt_mid = cm->filter_level; 294 295 if (filt_mid < min_filter_level) { 296 filt_mid = min_filter_level; 297 } else if (filt_mid > max_filter_level) { 298 filt_mid = max_filter_level; 299 } 300 301 /* Define the initial step size */ 302 filter_step = (filt_mid < 16) ? 4 : filt_mid / 4; 303 304 /* Get baseline error score */ 305 306 /* Copy the unfiltered / processed recon buffer to the new buffer */ 307 vpx_yv12_copy_y(saved_frame, cm->frame_to_show); 308 309 vp8cx_set_alt_lf_level(cpi, filt_mid); 310 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_mid); 311 312 best_err = vp8_calc_ss_err(sd, cm->frame_to_show); 313 314 ss_err[filt_mid] = best_err; 315 316 filt_best = filt_mid; 317 318 while (filter_step > 0) { 319 Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step; 320 321 if (cpi->twopass.section_intra_rating < 20) { 322 Bias = Bias * cpi->twopass.section_intra_rating / 20; 323 } 324 325 filt_high = ((filt_mid + filter_step) > max_filter_level) 326 ? max_filter_level 327 : (filt_mid + filter_step); 328 filt_low = ((filt_mid - filter_step) < min_filter_level) 329 ? min_filter_level 330 : (filt_mid - filter_step); 331 332 if ((filt_direction <= 0) && (filt_low != filt_mid)) { 333 if (ss_err[filt_low] == 0) { 334 /* Get Low filter error score */ 335 vpx_yv12_copy_y(saved_frame, cm->frame_to_show); 336 vp8cx_set_alt_lf_level(cpi, filt_low); 337 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low); 338 339 filt_err = vp8_calc_ss_err(sd, cm->frame_to_show); 340 ss_err[filt_low] = filt_err; 341 } else { 342 filt_err = ss_err[filt_low]; 343 } 344 345 /* If value is close to the best so far then bias towards a 346 * lower loop filter value. 347 */ 348 if ((filt_err - Bias) < best_err) { 349 /* Was it actually better than the previous best? */ 350 if (filt_err < best_err) best_err = filt_err; 351 352 filt_best = filt_low; 353 } 354 } 355 356 /* Now look at filt_high */ 357 if ((filt_direction >= 0) && (filt_high != filt_mid)) { 358 if (ss_err[filt_high] == 0) { 359 vpx_yv12_copy_y(saved_frame, cm->frame_to_show); 360 vp8cx_set_alt_lf_level(cpi, filt_high); 361 vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high); 362 363 filt_err = vp8_calc_ss_err(sd, cm->frame_to_show); 364 ss_err[filt_high] = filt_err; 365 } else { 366 filt_err = ss_err[filt_high]; 367 } 368 369 /* Was it better than the previous best? */ 370 if (filt_err < (best_err - Bias)) { 371 best_err = filt_err; 372 filt_best = filt_high; 373 } 374 } 375 376 /* Half the step distance if the best filter value was the same 377 * as last time 378 */ 379 if (filt_best == filt_mid) { 380 filter_step = filter_step / 2; 381 filt_direction = 0; 382 } else { 383 filt_direction = (filt_best < filt_mid) ? -1 : 1; 384 filt_mid = filt_best; 385 } 386 } 387 388 cm->filter_level = filt_best; 389 390 /* restore unfiltered frame pointer */ 391 cm->frame_to_show = saved_frame; 392 } 393
