aq_cyclicrefresh.c (29681B)
1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved. 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #include <limits.h> 13 #include <math.h> 14 15 #include "av1/common/pred_common.h" 16 #include "av1/common/seg_common.h" 17 #include "av1/encoder/aq_cyclicrefresh.h" 18 #include "av1/encoder/encoder_utils.h" 19 #include "av1/encoder/ratectrl.h" 20 #include "av1/encoder/segmentation.h" 21 #include "av1/encoder/tokenize.h" 22 #include "aom_dsp/aom_dsp_common.h" 23 24 CYCLIC_REFRESH *av1_cyclic_refresh_alloc(int mi_rows, int mi_cols) { 25 CYCLIC_REFRESH *const cr = aom_calloc(1, sizeof(*cr)); 26 if (cr == NULL) return NULL; 27 28 cr->map = aom_calloc(mi_rows * mi_cols, sizeof(*cr->map)); 29 cr->counter_encode_maxq_scene_change = 0; 30 cr->percent_refresh_adjustment = 5; 31 cr->rate_ratio_qdelta_adjustment = 0.25; 32 if (cr->map == NULL) { 33 av1_cyclic_refresh_free(cr); 34 return NULL; 35 } 36 return cr; 37 } 38 39 void av1_cyclic_refresh_free(CYCLIC_REFRESH *cr) { 40 if (cr != NULL) { 41 aom_free(cr->map); 42 aom_free(cr); 43 } 44 } 45 46 // Check if this coding block, of size bsize, should be considered for refresh 47 // (lower-qp coding). Decision can be based on various factors, such as 48 // size of the coding block (i.e., below min_block size rejected), coding 49 // mode, and rate/distortion. 50 static int candidate_refresh_aq(const CYCLIC_REFRESH *cr, 51 const MB_MODE_INFO *mbmi, int64_t rate, 52 int64_t dist, BLOCK_SIZE bsize, 53 int noise_level) { 54 MV mv = mbmi->mv[0].as_mv; 55 int is_compound = has_second_ref(mbmi); 56 // Reject the block for lower-qp coding for non-compound mode if 57 // projected distortion is above the threshold, and any of the following 58 // is true: 59 // 1) mode uses large mv 60 // 2) mode is an intra-mode 61 // Otherwise accept for refresh. 62 if (!is_compound && dist > cr->thresh_dist_sb && 63 (mv.row > cr->motion_thresh || mv.row < -cr->motion_thresh || 64 mv.col > cr->motion_thresh || mv.col < -cr->motion_thresh || 65 !is_inter_block(mbmi))) 66 return CR_SEGMENT_ID_BASE; 67 else if ((is_compound && noise_level < kMedium) || 68 (bsize >= BLOCK_16X16 && rate < cr->thresh_rate_sb && 69 is_inter_block(mbmi) && mbmi->mv[0].as_int == 0 && 70 cr->rate_boost_fac > 10)) 71 // More aggressive delta-q for bigger blocks with zero motion. 72 return CR_SEGMENT_ID_BOOST2; 73 else 74 return CR_SEGMENT_ID_BOOST1; 75 } 76 77 // Compute delta-q for the segment. 78 static int compute_deltaq(const AV1_COMP *cpi, int q, double rate_factor) { 79 const CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 80 int deltaq = av1_compute_qdelta_by_rate( 81 cpi, cpi->common.current_frame.frame_type, q, rate_factor); 82 if ((-deltaq) > cr->max_qdelta_perc * q / 100) { 83 deltaq = -cr->max_qdelta_perc * q / 100; 84 } 85 return deltaq; 86 } 87 88 int av1_cyclic_refresh_estimate_bits_at_q(const AV1_COMP *cpi, 89 double correction_factor) { 90 const AV1_COMMON *const cm = &cpi->common; 91 const int base_qindex = cm->quant_params.base_qindex; 92 const CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 93 const int mbs = cm->mi_params.MBs; 94 const int num4x4bl = mbs << 4; 95 // Weight for non-base segments: use actual number of blocks refreshed in 96 // previous/just encoded frame. Note number of blocks here is in 4x4 units. 97 double weight_segment1 = (double)cr->actual_num_seg1_blocks / num4x4bl; 98 double weight_segment2 = (double)cr->actual_num_seg2_blocks / num4x4bl; 99 if (cpi->rc.rtc_external_ratectrl) { 100 weight_segment1 = (double)(cr->percent_refresh * cm->mi_params.mi_rows * 101 cm->mi_params.mi_cols / 100) / 102 num4x4bl; 103 weight_segment2 = 0; 104 } 105 // Take segment weighted average for estimated bits. 106 const int estimated_bits = (int)round( 107 (1.0 - weight_segment1 - weight_segment2) * 108 av1_estimate_bits_at_q(cpi, base_qindex, correction_factor) + 109 weight_segment1 * 110 av1_estimate_bits_at_q(cpi, base_qindex + cr->qindex_delta[1], 111 correction_factor) + 112 weight_segment2 * 113 av1_estimate_bits_at_q(cpi, base_qindex + cr->qindex_delta[2], 114 correction_factor)); 115 return estimated_bits; 116 } 117 118 int av1_cyclic_refresh_rc_bits_per_mb(const AV1_COMP *cpi, int i, 119 double correction_factor) { 120 const AV1_COMMON *const cm = &cpi->common; 121 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 122 int bits_per_mb; 123 int num4x4bl = cm->mi_params.MBs << 4; 124 // Weight for segment prior to encoding: take the average of the target 125 // number for the frame to be encoded and the actual from the previous frame. 126 double weight_segment = 127 (double)((cr->target_num_seg_blocks + cr->actual_num_seg1_blocks + 128 cr->actual_num_seg2_blocks) >> 129 1) / 130 num4x4bl; 131 if (cpi->rc.rtc_external_ratectrl) { 132 weight_segment = (double)((cr->target_num_seg_blocks + 133 cr->percent_refresh * cm->mi_params.mi_rows * 134 cm->mi_params.mi_cols / 100) >> 135 1) / 136 num4x4bl; 137 } 138 // Compute delta-q corresponding to qindex i. 139 int deltaq = compute_deltaq(cpi, i, cr->rate_ratio_qdelta); 140 const int accurate_estimate = cpi->sf.hl_sf.accurate_bit_estimate; 141 // Take segment weighted average for bits per mb. 142 bits_per_mb = (int)round( 143 (1.0 - weight_segment) * 144 av1_rc_bits_per_mb(cpi, cm->current_frame.frame_type, i, 145 correction_factor, accurate_estimate) + 146 weight_segment * av1_rc_bits_per_mb(cpi, cm->current_frame.frame_type, 147 i + deltaq, correction_factor, 148 accurate_estimate)); 149 return bits_per_mb; 150 } 151 152 void av1_cyclic_reset_segment_skip(const AV1_COMP *cpi, MACROBLOCK *const x, 153 int mi_row, int mi_col, BLOCK_SIZE bsize, 154 RUN_TYPE dry_run) { 155 int cdf_num; 156 const AV1_COMMON *const cm = &cpi->common; 157 MACROBLOCKD *const xd = &x->e_mbd; 158 MB_MODE_INFO *const mbmi = xd->mi[0]; 159 const int prev_segment_id = mbmi->segment_id; 160 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 161 const int bw = mi_size_wide[bsize]; 162 const int bh = mi_size_high[bsize]; 163 const int xmis = AOMMIN(cm->mi_params.mi_cols - mi_col, bw); 164 const int ymis = AOMMIN(cm->mi_params.mi_rows - mi_row, bh); 165 166 assert(cm->seg.enabled); 167 168 if (!cr->skip_over4x4 && !cpi->roi.reference_enabled) { 169 mbmi->segment_id = 170 av1_get_spatial_seg_pred(cm, xd, &cdf_num, cr->skip_over4x4); 171 if (prev_segment_id != mbmi->segment_id) { 172 const int block_index = mi_row * cm->mi_params.mi_cols + mi_col; 173 const int mi_stride = cm->mi_params.mi_cols; 174 const uint8_t segment_id = mbmi->segment_id; 175 for (int mi_y = 0; mi_y < ymis; mi_y++) { 176 const int map_offset = block_index + mi_y * mi_stride; 177 memset(&cr->map[map_offset], 0, xmis); 178 memset(&cpi->enc_seg.map[map_offset], segment_id, xmis); 179 memset(&cm->cur_frame->seg_map[map_offset], segment_id, xmis); 180 } 181 } 182 } 183 if (!dry_run) { 184 if (cyclic_refresh_segment_id(prev_segment_id) == CR_SEGMENT_ID_BOOST1) 185 x->actual_num_seg1_blocks -= xmis * ymis; 186 else if (cyclic_refresh_segment_id(prev_segment_id) == CR_SEGMENT_ID_BOOST2) 187 x->actual_num_seg2_blocks -= xmis * ymis; 188 } 189 } 190 191 void av1_cyclic_refresh_update_segment(const AV1_COMP *cpi, MACROBLOCK *const x, 192 int mi_row, int mi_col, BLOCK_SIZE bsize, 193 int64_t rate, int64_t dist, int skip, 194 RUN_TYPE dry_run) { 195 const AV1_COMMON *const cm = &cpi->common; 196 MACROBLOCKD *const xd = &x->e_mbd; 197 MB_MODE_INFO *const mbmi = xd->mi[0]; 198 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 199 const int bw = mi_size_wide[bsize]; 200 const int bh = mi_size_high[bsize]; 201 const int xmis = AOMMIN(cm->mi_params.mi_cols - mi_col, bw); 202 const int ymis = AOMMIN(cm->mi_params.mi_rows - mi_row, bh); 203 const int block_index = mi_row * cm->mi_params.mi_cols + mi_col; 204 int noise_level = 0; 205 if (cpi->noise_estimate.enabled) noise_level = cpi->noise_estimate.level; 206 const int refresh_this_block = 207 candidate_refresh_aq(cr, mbmi, rate, dist, bsize, noise_level); 208 int sh = cpi->cyclic_refresh->skip_over4x4 ? 2 : 1; 209 // Default is to not update the refresh map. 210 int new_map_value = cr->map[block_index]; 211 212 // If this block is labeled for refresh, check if we should reset the 213 // segment_id. 214 if (cyclic_refresh_segment_id_boosted(mbmi->segment_id)) { 215 mbmi->segment_id = refresh_this_block; 216 // Reset segment_id if will be skipped. 217 if (skip) mbmi->segment_id = CR_SEGMENT_ID_BASE; 218 } 219 const uint8_t segment_id = mbmi->segment_id; 220 221 // Update the cyclic refresh map, to be used for setting segmentation map 222 // for the next frame. If the block will be refreshed this frame, mark it 223 // as clean. The magnitude of the -ve influences how long before we consider 224 // it for refresh again. 225 if (cyclic_refresh_segment_id_boosted(segment_id)) { 226 new_map_value = -cr->time_for_refresh; 227 } else if (refresh_this_block) { 228 // Else if it is accepted as candidate for refresh, and has not already 229 // been refreshed (marked as 1) then mark it as a candidate for cleanup 230 // for future time (marked as 0), otherwise don't update it. 231 if (cr->map[block_index] == 1) new_map_value = 0; 232 } else { 233 // Leave it marked as block that is not candidate for refresh. 234 new_map_value = 1; 235 } 236 237 // Update entries in the cyclic refresh map with new_map_value, and 238 // copy mbmi->segment_id into global segmentation map. 239 const int mi_stride = cm->mi_params.mi_cols; 240 for (int mi_y = 0; mi_y < ymis; mi_y += sh) { 241 const int map_offset = block_index + mi_y * mi_stride; 242 memset(&cr->map[map_offset], new_map_value, xmis); 243 memset(&cpi->enc_seg.map[map_offset], segment_id, xmis); 244 memset(&cm->cur_frame->seg_map[map_offset], segment_id, xmis); 245 } 246 247 // Accumulate cyclic refresh update counters. 248 if (!dry_run) { 249 if (cyclic_refresh_segment_id(segment_id) == CR_SEGMENT_ID_BOOST1) 250 x->actual_num_seg1_blocks += xmis * ymis; 251 else if (cyclic_refresh_segment_id(segment_id) == CR_SEGMENT_ID_BOOST2) 252 x->actual_num_seg2_blocks += xmis * ymis; 253 } 254 } 255 256 // Initializes counters used for cyclic refresh. 257 void av1_init_cyclic_refresh_counters(MACROBLOCK *const x) { 258 x->actual_num_seg1_blocks = 0; 259 x->actual_num_seg2_blocks = 0; 260 } 261 262 // Accumulate cyclic refresh counters. 263 void av1_accumulate_cyclic_refresh_counters( 264 CYCLIC_REFRESH *const cyclic_refresh, const MACROBLOCK *const x) { 265 cyclic_refresh->actual_num_seg1_blocks += x->actual_num_seg1_blocks; 266 cyclic_refresh->actual_num_seg2_blocks += x->actual_num_seg2_blocks; 267 } 268 269 void av1_cyclic_refresh_set_golden_update(AV1_COMP *const cpi) { 270 RATE_CONTROL *const rc = &cpi->rc; 271 PRIMARY_RATE_CONTROL *const p_rc = &cpi->ppi->p_rc; 272 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 273 // Set minimum gf_interval for GF update to a multiple of the refresh period, 274 // with some max limit. Depending on past encoding stats, GF flag may be 275 // reset and update may not occur until next baseline_gf_interval. 276 const int gf_length_mult[2] = { 8, 4 }; 277 if (cr->percent_refresh > 0) 278 p_rc->baseline_gf_interval = 279 AOMMIN(gf_length_mult[cpi->sf.rt_sf.gf_length_lvl] * 280 (100 / cr->percent_refresh), 281 MAX_GF_INTERVAL_RT); 282 else 283 p_rc->baseline_gf_interval = FIXED_GF_INTERVAL_RT; 284 if (rc->avg_frame_low_motion && rc->avg_frame_low_motion < 40) 285 p_rc->baseline_gf_interval = 16; 286 } 287 288 // Update the segmentation map, and related quantities: cyclic refresh map, 289 // refresh sb_index, and target number of blocks to be refreshed. 290 // The map is set to either 0/CR_SEGMENT_ID_BASE (no refresh) or to 291 // 1/CR_SEGMENT_ID_BOOST1 (refresh) for each superblock. 292 // Blocks labeled as BOOST1 may later get set to BOOST2 (during the 293 // encoding of the superblock). 294 static void cyclic_refresh_update_map(AV1_COMP *const cpi) { 295 AV1_COMMON *const cm = &cpi->common; 296 const CommonModeInfoParams *const mi_params = &cm->mi_params; 297 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 298 unsigned char *const seg_map = cpi->enc_seg.map; 299 unsigned char *const active_map_4x4 = cpi->active_map.map; 300 int i, block_count, bl_index, sb_rows, sb_cols, sbs_in_frame; 301 int xmis, ymis, x, y; 302 uint64_t sb_sad = 0; 303 uint64_t thresh_sad_low = 0; 304 uint64_t thresh_sad = INT64_MAX; 305 const int mi_rows = mi_params->mi_rows, mi_cols = mi_params->mi_cols; 306 const int mi_stride = mi_cols; 307 // Don't set seg_map to 0 if active_maps is enabled. Active_maps will set 308 // seg_map to either 7 or 0 (AM_SEGMENT_ID_INACTIVE/ACTIVE), and cyclic 309 // refresh set below (segment 1 or 2) will only be set for ACTIVE blocks. 310 if (!cpi->active_map.enabled) { 311 memset(seg_map, CR_SEGMENT_ID_BASE, mi_rows * mi_cols); 312 } 313 sb_cols = (mi_cols + cm->seq_params->mib_size - 1) / cm->seq_params->mib_size; 314 sb_rows = (mi_rows + cm->seq_params->mib_size - 1) / cm->seq_params->mib_size; 315 sbs_in_frame = sb_cols * sb_rows; 316 // Number of target blocks to get the q delta (segment 1). 317 block_count = cr->percent_refresh * mi_rows * mi_cols / 100; 318 // Set the segmentation map: cycle through the superblocks, starting at 319 // cr->mb_index, and stopping when either block_count blocks have been found 320 // to be refreshed, or we have passed through whole frame. 321 if (cr->sb_index >= sbs_in_frame) cr->sb_index = 0; 322 assert(cr->sb_index < sbs_in_frame); 323 i = cr->sb_index; 324 cr->last_sb_index = cr->sb_index; 325 cr->target_num_seg_blocks = 0; 326 do { 327 int sum_map = 0; 328 // Get the mi_row/mi_col corresponding to superblock index i. 329 int sb_row_index = (i / sb_cols); 330 int sb_col_index = i - sb_row_index * sb_cols; 331 int mi_row = sb_row_index * cm->seq_params->mib_size; 332 int mi_col = sb_col_index * cm->seq_params->mib_size; 333 assert(mi_row >= 0 && mi_row < mi_rows); 334 assert(mi_col >= 0 && mi_col < mi_cols); 335 bl_index = mi_row * mi_stride + mi_col; 336 // Loop through all MI blocks in superblock and update map. 337 xmis = AOMMIN(mi_cols - mi_col, cm->seq_params->mib_size); 338 ymis = AOMMIN(mi_rows - mi_row, cm->seq_params->mib_size); 339 if (cr->use_block_sad_scene_det && cpi->rc.frames_since_key > 30 && 340 cr->counter_encode_maxq_scene_change > 30 && 341 cpi->src_sad_blk_64x64 != NULL && 342 cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1) { 343 sb_sad = cpi->src_sad_blk_64x64[sb_col_index + sb_cols * sb_row_index]; 344 int scale = (cm->width * cm->height < 640 * 360) ? 6 : 8; 345 int scale_low = 2; 346 thresh_sad = (scale * 64 * 64); 347 thresh_sad_low = (scale_low * 64 * 64); 348 // For temporal layers: the base temporal layer (temporal_layer_id = 0) 349 // has larger frame separation (2 or 4 frames apart), so use larger sad 350 // thresholds to compensate for larger frame sad. The larger thresholds 351 // also increase the amount of refresh, which is needed for the base 352 // temporal layer. 353 if (cpi->svc.number_temporal_layers > 1 && 354 cpi->svc.temporal_layer_id == 0) { 355 thresh_sad <<= 4; 356 thresh_sad_low <<= 2; 357 } 358 } 359 // cr_map only needed at 8x8 blocks. 360 for (y = 0; y < ymis; y += 2) { 361 for (x = 0; x < xmis; x += 2) { 362 const int bl_index2 = bl_index + y * mi_stride + x; 363 // If the block is as a candidate for clean up then mark it 364 // for possible boost/refresh (segment 1). The segment id may get 365 // reset to 0 later if block gets coded anything other than low motion. 366 // If the block_sad (sb_sad) is very low label it for refresh anyway. 367 // If active_maps is enabled, only allow for setting on ACTIVE blocks. 368 if ((cr->map[bl_index2] == 0 || sb_sad < thresh_sad_low) && 369 (!cpi->active_map.enabled || 370 active_map_4x4[bl_index2] == AM_SEGMENT_ID_ACTIVE)) { 371 sum_map += 4; 372 } else if (cr->map[bl_index2] < 0) { 373 cr->map[bl_index2]++; 374 } 375 } 376 } 377 // Enforce constant segment over superblock. 378 // If segment is at least half of superblock, set to 1. 379 // Enforce that block sad (sb_sad) is not too high. 380 if (sum_map >= (xmis * ymis) >> 1 && sb_sad < thresh_sad) { 381 set_segment_id(seg_map, bl_index, xmis, ymis, mi_stride, 382 CR_SEGMENT_ID_BOOST1); 383 cr->target_num_seg_blocks += xmis * ymis; 384 } 385 i++; 386 if (i == sbs_in_frame) { 387 i = 0; 388 } 389 } while (cr->target_num_seg_blocks < block_count && i != cr->sb_index); 390 cr->sb_index = i; 391 if (cr->target_num_seg_blocks == 0) { 392 // Disable segmentation, seg_map is already set to 0 above. 393 // Don't disable if active_map is being used. 394 if (!cpi->active_map.enabled) av1_disable_segmentation(&cm->seg); 395 } 396 } 397 398 static int is_scene_change_detected(AV1_COMP *const cpi) { 399 return cpi->rc.high_source_sad; 400 } 401 402 // Set cyclic refresh parameters. 403 void av1_cyclic_refresh_update_parameters(AV1_COMP *const cpi) { 404 // TODO(marpan): Parameters need to be tuned. 405 const RATE_CONTROL *const rc = &cpi->rc; 406 const PRIMARY_RATE_CONTROL *const p_rc = &cpi->ppi->p_rc; 407 const AV1_COMMON *const cm = &cpi->common; 408 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 409 SVC *const svc = &cpi->svc; 410 const int qp_thresh = AOMMAX(16, rc->best_quality + 4); 411 const int qp_max_thresh = 118 * MAXQ >> 7; 412 const int scene_change_detected = is_scene_change_detected(cpi); 413 const int is_screen_content = 414 (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN); 415 416 // A scene change or key frame marks the start of a cyclic refresh cycle. 417 const int frames_since_scene_change = 418 (cpi->ppi->use_svc || !is_screen_content) 419 ? cpi->rc.frames_since_key 420 : AOMMIN(cpi->rc.frames_since_key, 421 cr->counter_encode_maxq_scene_change); 422 423 // Cases to reset the cyclic refresh adjustment parameters. 424 if (frame_is_intra_only(cm) || scene_change_detected || 425 cpi->ppi->rtc_ref.bias_recovery_frame) { 426 // Reset adaptive elements for intra only frames and scene changes. 427 cr->percent_refresh_adjustment = 5; 428 cr->rate_ratio_qdelta_adjustment = 0.25; 429 } 430 431 // Although this segment feature for RTC is only used for 432 // blocks >= 8X8, for more efficient coding of the seg map 433 // cur_frame->seg_map needs to set at 4x4 along with the 434 // function av1_cyclic_reset_segment_skip(). Skipping over 435 // 4x4 will therefore have small bdrate loss (~0.2%), so 436 // we use it only for speed > 9 for now. 437 cr->skip_over4x4 = (cpi->oxcf.speed > 9 && !cpi->roi.enabled) ? 1 : 0; 438 439 // should we enable cyclic refresh on this frame. 440 cr->apply_cyclic_refresh = 1; 441 if (frame_is_intra_only(cm) || is_lossless_requested(&cpi->oxcf.rc_cfg) || 442 cpi->roi.enabled || cpi->rc.high_motion_content_screen_rtc || 443 scene_change_detected || svc->temporal_layer_id > 0 || 444 svc->prev_number_spatial_layers != svc->number_spatial_layers || 445 p_rc->avg_frame_qindex[INTER_FRAME] < qp_thresh || 446 (svc->number_spatial_layers > 1 && 447 svc->layer_context[svc->temporal_layer_id].is_key_frame) || 448 (frames_since_scene_change > 20 && 449 p_rc->avg_frame_qindex[INTER_FRAME] > qp_max_thresh) || 450 (rc->avg_frame_low_motion && rc->avg_frame_low_motion < 30 && 451 frames_since_scene_change > 40) || 452 cpi->ppi->rtc_ref.bias_recovery_frame) { 453 cr->apply_cyclic_refresh = 0; 454 return; 455 } 456 457 // Increase the amount of refresh for #temporal_layers > 2 458 if (svc->number_temporal_layers > 2) 459 cr->percent_refresh = 15; 460 else 461 cr->percent_refresh = 10 + cr->percent_refresh_adjustment; 462 463 if (cpi->active_map.enabled) { 464 // Scale down the percent_refresh to target the active blocks only. 465 cr->percent_refresh = 466 cr->percent_refresh * (100 - cpi->rc.percent_blocks_inactive) / 100; 467 if (cr->percent_refresh == 0) { 468 cr->apply_cyclic_refresh = 0; 469 } 470 } 471 472 cr->max_qdelta_perc = 60; 473 cr->time_for_refresh = 0; 474 cr->use_block_sad_scene_det = 475 (cpi->oxcf.tune_cfg.content != AOM_CONTENT_SCREEN && 476 cm->seq_params->sb_size == BLOCK_64X64) 477 ? 1 478 : 0; 479 cr->motion_thresh = 32; 480 cr->rate_boost_fac = 481 (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN) ? 10 : 15; 482 483 // Use larger delta-qp (increase rate_ratio_qdelta) for first few 484 // refresh cycles after a key frame (svc) or scene change (non svc). 485 // For non svc screen content, after a scene change gradually reduce 486 // this boost and supress it further if either of the previous two 487 // frames overshot. 488 if (cr->percent_refresh > 0) { 489 if (cpi->ppi->use_svc || !is_screen_content) { 490 if (frames_since_scene_change < 491 ((4 * svc->number_temporal_layers) * (100 / cr->percent_refresh))) { 492 cr->rate_ratio_qdelta = 3.0 + cr->rate_ratio_qdelta_adjustment; 493 } else { 494 cr->rate_ratio_qdelta = 2.25 + cr->rate_ratio_qdelta_adjustment; 495 } 496 } else { 497 double distance_from_sc_factor = 498 AOMMIN(0.75, (int)(frames_since_scene_change / 10) * 0.1); 499 cr->rate_ratio_qdelta = 500 3.0 + cr->rate_ratio_qdelta_adjustment - distance_from_sc_factor; 501 if ((frames_since_scene_change < 10) && 502 ((cpi->rc.rc_1_frame < 0) || (cpi->rc.rc_2_frame < 0))) { 503 cr->rate_ratio_qdelta -= 0.25; 504 } 505 } 506 } else { 507 cr->rate_ratio_qdelta = 2.25 + cr->rate_ratio_qdelta_adjustment; 508 } 509 // Adjust some parameters for low resolutions. 510 if (cm->width * cm->height <= 352 * 288) { 511 if (cpi->svc.number_temporal_layers > 1) { 512 cr->motion_thresh = 32; 513 cr->rate_boost_fac = 13; 514 } else { 515 if (rc->avg_frame_bandwidth < 3000) { 516 cr->motion_thresh = 16; 517 cr->rate_boost_fac = 13; 518 } else { 519 cr->max_qdelta_perc = 50; 520 cr->rate_ratio_qdelta = AOMMAX(cr->rate_ratio_qdelta, 2.0); 521 } 522 } 523 } 524 if (cpi->oxcf.rc_cfg.mode == AOM_VBR) { 525 // To be adjusted for VBR mode, e.g., based on gf period and boost. 526 // For now use smaller qp-delta (than CBR), no second boosted seg, and 527 // turn-off (no refresh) on golden refresh (since it's already boosted). 528 cr->percent_refresh = 10; 529 cr->rate_ratio_qdelta = 1.5; 530 cr->rate_boost_fac = 10; 531 if (cpi->refresh_frame.golden_frame) { 532 cr->percent_refresh = 0; 533 cr->rate_ratio_qdelta = 1.0; 534 } 535 } 536 if (rc->rtc_external_ratectrl) { 537 cr->actual_num_seg1_blocks = cr->percent_refresh * cm->mi_params.mi_rows * 538 cm->mi_params.mi_cols / 100; 539 cr->actual_num_seg2_blocks = 0; 540 } 541 } 542 543 static void cyclic_refresh_reset_resize(AV1_COMP *const cpi) { 544 const AV1_COMMON *const cm = &cpi->common; 545 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 546 memset(cr->map, 0, cm->mi_params.mi_rows * cm->mi_params.mi_cols); 547 cr->sb_index = 0; 548 cr->last_sb_index = 0; 549 cpi->refresh_frame.golden_frame = true; 550 cr->apply_cyclic_refresh = 0; 551 cr->counter_encode_maxq_scene_change = 0; 552 cr->percent_refresh_adjustment = 5; 553 cr->rate_ratio_qdelta_adjustment = 0.25; 554 } 555 556 // Setup cyclic background refresh: set delta q and segmentation map. 557 void av1_cyclic_refresh_setup(AV1_COMP *const cpi) { 558 AV1_COMMON *const cm = &cpi->common; 559 const RATE_CONTROL *const rc = &cpi->rc; 560 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 561 struct segmentation *const seg = &cm->seg; 562 const int scene_change_detected = is_scene_change_detected(cpi); 563 const GF_GROUP *const gf_group = &cpi->ppi->gf_group; 564 const int boost_index = AOMMIN(15, (cpi->ppi->p_rc.gfu_boost / 100)); 565 const int layer_depth = AOMMIN(gf_group->layer_depth[cpi->gf_frame_index], 6); 566 const FRAME_TYPE frame_type = cm->current_frame.frame_type; 567 568 // Set resolution_change flag: for single spatial layers only. 569 const int resolution_change = !cpi->rc.rtc_external_ratectrl && 570 cm->prev_frame && 571 cpi->svc.number_spatial_layers == 1 && 572 (cm->width != cm->prev_frame->width || 573 cm->height != cm->prev_frame->height); 574 575 if (resolution_change && cpi->svc.temporal_layer_id == 0) 576 cyclic_refresh_reset_resize(cpi); 577 if (!cr->apply_cyclic_refresh) { 578 // Don't disable and set seg_map to 0 if active_maps is enabled, unless 579 // whole frame is set as inactive (since we only apply cyclic_refresh to 580 // active blocks). 581 if (!cpi->active_map.enabled || cpi->rc.percent_blocks_inactive == 100) { 582 unsigned char *const seg_map = cpi->enc_seg.map; 583 memset(seg_map, 0, cm->mi_params.mi_rows * cm->mi_params.mi_cols); 584 av1_disable_segmentation(&cm->seg); 585 } 586 if (frame_is_intra_only(cm) || scene_change_detected || 587 cpi->ppi->rtc_ref.bias_recovery_frame) { 588 cr->sb_index = 0; 589 cr->last_sb_index = 0; 590 cr->counter_encode_maxq_scene_change = 0; 591 cr->actual_num_seg1_blocks = 0; 592 cr->actual_num_seg2_blocks = 0; 593 } 594 return; 595 } else { 596 cr->counter_encode_maxq_scene_change++; 597 const double q = av1_convert_qindex_to_q(cm->quant_params.base_qindex, 598 cm->seq_params->bit_depth); 599 // Set rate threshold to some multiple (set to 2 for now) of the target 600 // rate (target is given by sb64_target_rate and scaled by 256). 601 cr->thresh_rate_sb = ((int64_t)(rc->sb64_target_rate) << 8) << 2; 602 // Distortion threshold, quadratic in Q, scale factor to be adjusted. 603 // q will not exceed 457, so (q * q) is within 32bit; see: 604 // av1_convert_qindex_to_q(), av1_ac_quant(), ac_qlookup*[]. 605 cr->thresh_dist_sb = ((int64_t)(q * q)) << 2; 606 // For low-resoln or lower speeds, the rate/dist thresholds need to be 607 // tuned/updated. 608 if (cpi->oxcf.speed <= 7 || (cm->width * cm->height < 640 * 360)) { 609 cr->thresh_dist_sb = 0; 610 cr->thresh_rate_sb = INT64_MAX; 611 } 612 // Set up segmentation. 613 av1_enable_segmentation(&cm->seg); 614 if (!cpi->active_map.enabled) { 615 // Clear down the segment map, only if active_maps is not enabled. 616 av1_clearall_segfeatures(seg); 617 } 618 619 // Note: setting temporal_update has no effect, as the seg-map coding method 620 // (temporal or spatial) is determined in 621 // av1_choose_segmap_coding_method(), 622 // based on the coding cost of each method. For error_resilient mode on the 623 // last_frame_seg_map is set to 0, so if temporal coding is used, it is 624 // relative to 0 previous map. 625 // seg->temporal_update = 0; 626 627 // Segment BASE "Q" feature is disabled so it defaults to the baseline Q. 628 av1_disable_segfeature(seg, CR_SEGMENT_ID_BASE, SEG_LVL_ALT_Q); 629 // Use segment BOOST1 for in-frame Q adjustment. 630 av1_enable_segfeature(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q); 631 // Use segment BOOST2 for more aggressive in-frame Q adjustment. 632 av1_enable_segfeature(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q); 633 634 // Set the q delta for segment BOOST1. 635 const CommonQuantParams *const quant_params = &cm->quant_params; 636 int qindex_delta = 637 compute_deltaq(cpi, quant_params->base_qindex, cr->rate_ratio_qdelta); 638 cr->qindex_delta[1] = qindex_delta; 639 640 // Compute rd-mult for segment BOOST1. 641 const int qindex2 = clamp( 642 quant_params->base_qindex + quant_params->y_dc_delta_q + qindex_delta, 643 0, MAXQ); 644 cr->rdmult = av1_compute_rd_mult( 645 qindex2, cm->seq_params->bit_depth, 646 cpi->ppi->gf_group.update_type[cpi->gf_frame_index], layer_depth, 647 boost_index, frame_type, cpi->oxcf.q_cfg.use_fixed_qp_offsets, 648 is_stat_consumption_stage(cpi), cpi->oxcf.tune_cfg.tuning); 649 650 av1_set_segdata(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q, qindex_delta); 651 652 // Set a more aggressive (higher) q delta for segment BOOST2. 653 qindex_delta = compute_deltaq( 654 cpi, quant_params->base_qindex, 655 AOMMIN(CR_MAX_RATE_TARGET_RATIO, 656 0.1 * cr->rate_boost_fac * cr->rate_ratio_qdelta)); 657 cr->qindex_delta[2] = qindex_delta; 658 av1_set_segdata(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q, qindex_delta); 659 660 // Update the segmentation and refresh map. 661 cyclic_refresh_update_map(cpi); 662 } 663 } 664 665 int av1_cyclic_refresh_get_rdmult(const CYCLIC_REFRESH *cr) { 666 return cr->rdmult; 667 } 668 669 int av1_cyclic_refresh_disable_lf_cdef(AV1_COMP *const cpi) { 670 CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; 671 const int qindex = cpi->common.quant_params.base_qindex; 672 if (cpi->active_map.enabled && 673 cpi->rc.percent_blocks_inactive > 674 cpi->sf.rt_sf.thresh_active_maps_skip_lf_cdef) 675 return 1; 676 if (cpi->rc.frames_since_key > 30 && cr->percent_refresh > 0 && 677 cr->counter_encode_maxq_scene_change > 300 / cr->percent_refresh && 678 cpi->rc.frame_source_sad < 1000 && 679 qindex < 7 * (cpi->rc.worst_quality >> 3)) 680 return 1; 681 // More aggressive skip. 682 else if (cpi->sf.rt_sf.skip_lf_screen > 1 && !cpi->rc.high_source_sad && 683 cpi->rc.frame_source_sad < 50000 && qindex < cpi->rc.worst_quality) 684 return 1; 685 return 0; 686 }