| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| |
| #include <limits.h> |
| #include <math.h> |
| |
| #include "av1/common/pred_common.h" |
| #include "av1/common/seg_common.h" |
| #include "av1/encoder/aq_cyclicrefresh.h" |
| #include "av1/encoder/ratectrl.h" |
| #include "av1/encoder/segmentation.h" |
| #include "av1/encoder/tokenize.h" |
| #include "aom_dsp/aom_dsp_common.h" |
| |
| CYCLIC_REFRESH *av1_cyclic_refresh_alloc(int mi_rows, int mi_cols) { |
| CYCLIC_REFRESH *const cr = aom_calloc(1, sizeof(*cr)); |
| if (cr == NULL) return NULL; |
| |
| cr->map = aom_calloc(mi_rows * mi_cols, sizeof(*cr->map)); |
| if (cr->map == NULL) { |
| av1_cyclic_refresh_free(cr); |
| return NULL; |
| } |
| return cr; |
| } |
| |
| void av1_cyclic_refresh_free(CYCLIC_REFRESH *cr) { |
| if (cr != NULL) { |
| aom_free(cr->map); |
| aom_free(cr); |
| } |
| } |
| |
| // Check if this coding block, of size bsize, should be considered for refresh |
| // (lower-qp coding). Decision can be based on various factors, such as |
| // size of the coding block (i.e., below min_block size rejected), coding |
| // mode, and rate/distortion. |
| static int candidate_refresh_aq(const CYCLIC_REFRESH *cr, |
| const MB_MODE_INFO *mbmi, int64_t rate, |
| int64_t dist, int bsize) { |
| MV mv = mbmi->mv[0].as_mv; |
| int is_compound = has_second_ref(mbmi); |
| // Reject the block for lower-qp coding for non-compound mode if |
| // projected distortion is above the threshold, and any of the following |
| // is true: |
| // 1) mode uses large mv |
| // 2) mode is an intra-mode |
| // Otherwise accept for refresh. |
| if (!is_compound && dist > cr->thresh_dist_sb && |
| (mv.row > cr->motion_thresh || mv.row < -cr->motion_thresh || |
| mv.col > cr->motion_thresh || mv.col < -cr->motion_thresh || |
| !is_inter_block(mbmi))) |
| return CR_SEGMENT_ID_BASE; |
| else if (is_compound || (bsize >= BLOCK_16X16 && rate < cr->thresh_rate_sb && |
| is_inter_block(mbmi) && mbmi->mv[0].as_int == 0 && |
| cr->rate_boost_fac > 10)) |
| // More aggressive delta-q for bigger blocks with zero motion. |
| return CR_SEGMENT_ID_BOOST2; |
| else |
| return CR_SEGMENT_ID_BOOST1; |
| } |
| |
| // Compute delta-q for the segment. |
| static int compute_deltaq(const AV1_COMP *cpi, int q, double rate_factor) { |
| const CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| int deltaq = av1_compute_qdelta_by_rate( |
| rc, cpi->common.current_frame.frame_type, q, rate_factor, |
| cpi->is_screen_content_type, cpi->common.seq_params->bit_depth); |
| if ((-deltaq) > cr->max_qdelta_perc * q / 100) { |
| deltaq = -cr->max_qdelta_perc * q / 100; |
| } |
| return deltaq; |
| } |
| |
| int av1_cyclic_refresh_estimate_bits_at_q(const AV1_COMP *cpi, |
| double correction_factor) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const FRAME_TYPE frame_type = cm->current_frame.frame_type; |
| const int base_qindex = cm->quant_params.base_qindex; |
| const int bit_depth = cm->seq_params->bit_depth; |
| const CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| const int mbs = cm->mi_params.MBs; |
| const int num4x4bl = mbs << 4; |
| // Weight for non-base segments: use actual number of blocks refreshed in |
| // previous/just encoded frame. Note number of blocks here is in 4x4 units. |
| double weight_segment1 = (double)cr->actual_num_seg1_blocks / num4x4bl; |
| double weight_segment2 = (double)cr->actual_num_seg2_blocks / num4x4bl; |
| if (cpi->rc.rtc_external_ratectrl) { |
| weight_segment1 = (double)(cr->percent_refresh * cm->mi_params.mi_rows * |
| cm->mi_params.mi_cols / 100) / |
| num4x4bl; |
| weight_segment2 = 0; |
| } |
| // Take segment weighted average for estimated bits. |
| const int estimated_bits = |
| (int)((1.0 - weight_segment1 - weight_segment2) * |
| av1_estimate_bits_at_q(frame_type, base_qindex, mbs, |
| correction_factor, bit_depth, |
| cpi->is_screen_content_type) + |
| weight_segment1 * av1_estimate_bits_at_q( |
| frame_type, base_qindex + cr->qindex_delta[1], |
| mbs, correction_factor, bit_depth, |
| cpi->is_screen_content_type) + |
| weight_segment2 * av1_estimate_bits_at_q( |
| frame_type, base_qindex + cr->qindex_delta[2], |
| mbs, correction_factor, bit_depth, |
| cpi->is_screen_content_type)); |
| return estimated_bits; |
| } |
| |
| int av1_cyclic_refresh_rc_bits_per_mb(const AV1_COMP *cpi, int i, |
| double correction_factor) { |
| const AV1_COMMON *const cm = &cpi->common; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| int bits_per_mb; |
| int num4x4bl = cm->mi_params.MBs << 4; |
| // Weight for segment prior to encoding: take the average of the target |
| // number for the frame to be encoded and the actual from the previous frame. |
| double weight_segment = |
| (double)((cr->target_num_seg_blocks + cr->actual_num_seg1_blocks + |
| cr->actual_num_seg2_blocks) >> |
| 1) / |
| num4x4bl; |
| if (cpi->rc.rtc_external_ratectrl) { |
| weight_segment = (double)((cr->target_num_seg_blocks + |
| cr->percent_refresh * cm->mi_params.mi_rows * |
| cm->mi_params.mi_cols / 100) >> |
| 1) / |
| num4x4bl; |
| } |
| // Compute delta-q corresponding to qindex i. |
| int deltaq = compute_deltaq(cpi, i, cr->rate_ratio_qdelta); |
| // Take segment weighted average for bits per mb. |
| bits_per_mb = |
| (int)((1.0 - weight_segment) * |
| av1_rc_bits_per_mb(cm->current_frame.frame_type, i, |
| correction_factor, cm->seq_params->bit_depth, |
| cpi->is_screen_content_type) + |
| weight_segment * av1_rc_bits_per_mb(cm->current_frame.frame_type, |
| i + deltaq, correction_factor, |
| cm->seq_params->bit_depth, |
| cpi->is_screen_content_type)); |
| return bits_per_mb; |
| } |
| |
| void av1_cyclic_reset_segment_skip(const AV1_COMP *cpi, MACROBLOCK *const x, |
| int mi_row, int mi_col, BLOCK_SIZE bsize) { |
| int cdf_num; |
| const AV1_COMMON *const cm = &cpi->common; |
| MACROBLOCKD *const xd = &x->e_mbd; |
| MB_MODE_INFO *const mbmi = xd->mi[0]; |
| int sh = cpi->cyclic_refresh->skip_over4x4 ? 2 : 1; |
| const int prev_segment_id = mbmi->segment_id; |
| mbmi->segment_id = av1_get_spatial_seg_pred(cm, xd, &cdf_num); |
| if (prev_segment_id != mbmi->segment_id) { |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| const int bw = mi_size_wide[bsize]; |
| const int bh = mi_size_high[bsize]; |
| const int xmis = AOMMIN(cm->mi_params.mi_cols - mi_col, bw); |
| const int ymis = AOMMIN(cm->mi_params.mi_rows - mi_row, bh); |
| const int block_index = mi_row * cm->mi_params.mi_cols + mi_col; |
| for (int mi_y = 0; mi_y < ymis; mi_y += sh) { |
| for (int mi_x = 0; mi_x < xmis; mi_x += sh) { |
| const int map_offset = |
| block_index + mi_y * cm->mi_params.mi_cols + mi_x; |
| cr->map[map_offset] = 0; |
| cpi->enc_seg.map[map_offset] = mbmi->segment_id; |
| cm->cur_frame->seg_map[map_offset] = mbmi->segment_id; |
| } |
| } |
| if (cyclic_refresh_segment_id(prev_segment_id) == CR_SEGMENT_ID_BOOST1) |
| x->actual_num_seg1_blocks -= xmis * ymis; |
| else if (cyclic_refresh_segment_id(prev_segment_id) == CR_SEGMENT_ID_BOOST2) |
| x->actual_num_seg2_blocks -= xmis * ymis; |
| if (cyclic_refresh_segment_id(mbmi->segment_id) == CR_SEGMENT_ID_BOOST1) |
| x->actual_num_seg1_blocks += xmis * ymis; |
| else if (cyclic_refresh_segment_id(mbmi->segment_id) == |
| CR_SEGMENT_ID_BOOST2) |
| x->actual_num_seg2_blocks += xmis * ymis; |
| } |
| } |
| |
| void av1_cyclic_refresh_update_segment(const AV1_COMP *cpi, MACROBLOCK *const x, |
| int mi_row, int mi_col, BLOCK_SIZE bsize, |
| int64_t rate, int64_t dist, int skip, |
| RUN_TYPE dry_run) { |
| const AV1_COMMON *const cm = &cpi->common; |
| MACROBLOCKD *const xd = &x->e_mbd; |
| MB_MODE_INFO *const mbmi = xd->mi[0]; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| const int bw = mi_size_wide[bsize]; |
| const int bh = mi_size_high[bsize]; |
| const int xmis = AOMMIN(cm->mi_params.mi_cols - mi_col, bw); |
| const int ymis = AOMMIN(cm->mi_params.mi_rows - mi_row, bh); |
| const int block_index = mi_row * cm->mi_params.mi_cols + mi_col; |
| const int refresh_this_block = |
| candidate_refresh_aq(cr, mbmi, rate, dist, bsize); |
| int sh = cpi->cyclic_refresh->skip_over4x4 ? 2 : 1; |
| // Default is to not update the refresh map. |
| int new_map_value = cr->map[block_index]; |
| |
| // If this block is labeled for refresh, check if we should reset the |
| // segment_id. |
| if (cyclic_refresh_segment_id_boosted(mbmi->segment_id)) { |
| mbmi->segment_id = refresh_this_block; |
| // Reset segment_id if will be skipped. |
| if (skip) mbmi->segment_id = CR_SEGMENT_ID_BASE; |
| } |
| |
| // Update the cyclic refresh map, to be used for setting segmentation map |
| // for the next frame. If the block will be refreshed this frame, mark it |
| // as clean. The magnitude of the -ve influences how long before we consider |
| // it for refresh again. |
| if (cyclic_refresh_segment_id_boosted(mbmi->segment_id)) { |
| new_map_value = -cr->time_for_refresh; |
| } else if (refresh_this_block) { |
| // Else if it is accepted as candidate for refresh, and has not already |
| // been refreshed (marked as 1) then mark it as a candidate for cleanup |
| // for future time (marked as 0), otherwise don't update it. |
| if (cr->map[block_index] == 1) new_map_value = 0; |
| } else { |
| // Leave it marked as block that is not candidate for refresh. |
| new_map_value = 1; |
| } |
| |
| // Update entries in the cyclic refresh map with new_map_value, and |
| // copy mbmi->segment_id into global segmentation map. |
| for (int mi_y = 0; mi_y < ymis; mi_y += sh) { |
| for (int mi_x = 0; mi_x < xmis; mi_x += sh) { |
| const int map_offset = block_index + mi_y * cm->mi_params.mi_cols + mi_x; |
| cr->map[map_offset] = new_map_value; |
| cpi->enc_seg.map[map_offset] = mbmi->segment_id; |
| cm->cur_frame->seg_map[map_offset] = mbmi->segment_id; |
| } |
| } |
| // Accumulate cyclic refresh update counters. |
| if (!dry_run) { |
| if (cyclic_refresh_segment_id(mbmi->segment_id) == CR_SEGMENT_ID_BOOST1) |
| x->actual_num_seg1_blocks += xmis * ymis; |
| else if (cyclic_refresh_segment_id(mbmi->segment_id) == |
| CR_SEGMENT_ID_BOOST2) |
| x->actual_num_seg2_blocks += xmis * ymis; |
| } |
| } |
| |
| // Initializes counters used for cyclic refresh. |
| void av1_init_cyclic_refresh_counters(MACROBLOCK *const x) { |
| x->actual_num_seg1_blocks = 0; |
| x->actual_num_seg2_blocks = 0; |
| x->cnt_zeromv = 0; |
| } |
| |
| // Accumulate cyclic refresh counters. |
| void av1_accumulate_cyclic_refresh_counters( |
| CYCLIC_REFRESH *const cyclic_refresh, const MACROBLOCK *const x) { |
| cyclic_refresh->actual_num_seg1_blocks += x->actual_num_seg1_blocks; |
| cyclic_refresh->actual_num_seg2_blocks += x->actual_num_seg2_blocks; |
| cyclic_refresh->cnt_zeromv += x->cnt_zeromv; |
| } |
| |
| void av1_cyclic_refresh_postencode(AV1_COMP *const cpi) { |
| AV1_COMMON *const cm = &cpi->common; |
| const CommonModeInfoParams *const mi_params = &cm->mi_params; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| RATE_CONTROL *const rc = &cpi->rc; |
| SVC *const svc = &cpi->svc; |
| const int avg_cnt_zeromv = |
| 100 * cr->cnt_zeromv / (mi_params->mi_rows * mi_params->mi_cols); |
| |
| if (!cpi->ppi->use_svc || |
| (cpi->ppi->use_svc && |
| !cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame && |
| cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1)) { |
| rc->avg_frame_low_motion = |
| (rc->avg_frame_low_motion == 0) |
| ? avg_cnt_zeromv |
| : (3 * rc->avg_frame_low_motion + avg_cnt_zeromv) / 4; |
| // For SVC: set avg_frame_low_motion (only computed on top spatial layer) |
| // to all lower spatial layers. |
| if (cpi->ppi->use_svc && |
| svc->spatial_layer_id == svc->number_spatial_layers - 1) { |
| for (int i = 0; i < svc->number_spatial_layers - 1; ++i) { |
| const int layer = LAYER_IDS_TO_IDX(i, svc->temporal_layer_id, |
| svc->number_temporal_layers); |
| LAYER_CONTEXT *const lc = &svc->layer_context[layer]; |
| RATE_CONTROL *const lrc = &lc->rc; |
| lrc->avg_frame_low_motion = rc->avg_frame_low_motion; |
| } |
| } |
| } |
| } |
| |
| void av1_cyclic_refresh_set_golden_update(AV1_COMP *const cpi) { |
| RATE_CONTROL *const rc = &cpi->rc; |
| PRIMARY_RATE_CONTROL *const p_rc = &cpi->ppi->p_rc; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| // Set minimum gf_interval for GF update to a multiple of the refresh period, |
| // with some max limit. Depending on past encoding stats, GF flag may be |
| // reset and update may not occur until next baseline_gf_interval. |
| const int gf_length_mult[2] = { 8, 4 }; |
| if (cr->percent_refresh > 0) |
| p_rc->baseline_gf_interval = |
| AOMMIN(gf_length_mult[cpi->sf.rt_sf.gf_length_lvl] * |
| (100 / cr->percent_refresh), |
| MAX_GF_INTERVAL_RT); |
| else |
| p_rc->baseline_gf_interval = FIXED_GF_INTERVAL_RT; |
| if (rc->avg_frame_low_motion && rc->avg_frame_low_motion < 40) |
| p_rc->baseline_gf_interval = 16; |
| } |
| |
| // Update the segmentation map, and related quantities: cyclic refresh map, |
| // refresh sb_index, and target number of blocks to be refreshed. |
| // The map is set to either 0/CR_SEGMENT_ID_BASE (no refresh) or to |
| // 1/CR_SEGMENT_ID_BOOST1 (refresh) for each superblock. |
| // Blocks labeled as BOOST1 may later get set to BOOST2 (during the |
| // encoding of the superblock). |
| static void cyclic_refresh_update_map(AV1_COMP *const cpi) { |
| AV1_COMMON *const cm = &cpi->common; |
| const CommonModeInfoParams *const mi_params = &cm->mi_params; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| unsigned char *const seg_map = cpi->enc_seg.map; |
| int i, block_count, bl_index, sb_rows, sb_cols, sbs_in_frame; |
| int xmis, ymis, x, y; |
| memset(seg_map, CR_SEGMENT_ID_BASE, mi_params->mi_rows * mi_params->mi_cols); |
| sb_cols = (mi_params->mi_cols + cm->seq_params->mib_size - 1) / |
| cm->seq_params->mib_size; |
| sb_rows = (mi_params->mi_rows + cm->seq_params->mib_size - 1) / |
| cm->seq_params->mib_size; |
| sbs_in_frame = sb_cols * sb_rows; |
| // Number of target blocks to get the q delta (segment 1). |
| block_count = |
| cr->percent_refresh * mi_params->mi_rows * mi_params->mi_cols / 100; |
| // Set the segmentation map: cycle through the superblocks, starting at |
| // cr->mb_index, and stopping when either block_count blocks have been found |
| // to be refreshed, or we have passed through whole frame. |
| if (cr->sb_index >= sbs_in_frame) cr->sb_index = 0; |
| assert(cr->sb_index < sbs_in_frame); |
| i = cr->sb_index; |
| cr->target_num_seg_blocks = 0; |
| do { |
| int sum_map = 0; |
| // Get the mi_row/mi_col corresponding to superblock index i. |
| int sb_row_index = (i / sb_cols); |
| int sb_col_index = i - sb_row_index * sb_cols; |
| int mi_row = sb_row_index * cm->seq_params->mib_size; |
| int mi_col = sb_col_index * cm->seq_params->mib_size; |
| assert(mi_row >= 0 && mi_row < mi_params->mi_rows); |
| assert(mi_col >= 0 && mi_col < mi_params->mi_cols); |
| bl_index = mi_row * mi_params->mi_cols + mi_col; |
| // Loop through all MI blocks in superblock and update map. |
| xmis = AOMMIN(mi_params->mi_cols - mi_col, cm->seq_params->mib_size); |
| ymis = AOMMIN(mi_params->mi_rows - mi_row, cm->seq_params->mib_size); |
| // cr_map only needed at 8x8 blocks. |
| for (y = 0; y < ymis; y += 2) { |
| for (x = 0; x < xmis; x += 2) { |
| const int bl_index2 = bl_index + y * mi_params->mi_cols + x; |
| // If the block is as a candidate for clean up then mark it |
| // for possible boost/refresh (segment 1). The segment id may get |
| // reset to 0 later if block gets coded anything other than GLOBALMV. |
| if (cr->map[bl_index2] == 0) { |
| sum_map += 4; |
| } else if (cr->map[bl_index2] < 0) { |
| cr->map[bl_index2]++; |
| } |
| } |
| } |
| // Enforce constant segment over superblock. |
| // If segment is at least half of superblock, set to 1. |
| if (sum_map >= (xmis * ymis) >> 1) { |
| for (y = 0; y < ymis; y++) |
| for (x = 0; x < xmis; x++) { |
| seg_map[bl_index + y * mi_params->mi_cols + x] = CR_SEGMENT_ID_BOOST1; |
| } |
| cr->target_num_seg_blocks += xmis * ymis; |
| } |
| i++; |
| if (i == sbs_in_frame) { |
| i = 0; |
| } |
| } while (cr->target_num_seg_blocks < block_count && i != cr->sb_index); |
| cr->sb_index = i; |
| } |
| |
| // Set cyclic refresh parameters. |
| void av1_cyclic_refresh_update_parameters(AV1_COMP *const cpi) { |
| // TODO(marpan): Parameters need to be tuned. |
| const RATE_CONTROL *const rc = &cpi->rc; |
| const PRIMARY_RATE_CONTROL *const p_rc = &cpi->ppi->p_rc; |
| const AV1_COMMON *const cm = &cpi->common; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| int num4x4bl = cm->mi_params.MBs << 4; |
| int target_refresh = 0; |
| double weight_segment_target = 0; |
| double weight_segment = 0; |
| int qp_thresh = AOMMIN(20, rc->best_quality << 1); |
| int qp_max_thresh = 118 * MAXQ >> 7; |
| // Although this segment feature for RTC is only used for |
| // blocks >= 8X8, for more efficient coding of the seg map |
| // cur_frame->seg_map needs to set at 4x4 along with the |
| // function av1_cyclic_reset_segment_skip(). Skipping over |
| // 4x4 will therefore have small bdrate loss (~0.2%), so |
| // we use it only for speed > 9 for now. |
| // Also if loop-filter deltas is applied via segment, then |
| // we need to set cr->skip_over4x4 = 1. |
| cr->skip_over4x4 = (cpi->oxcf.speed > 9) ? 1 : 0; |
| cr->apply_cyclic_refresh = 1; |
| if (frame_is_intra_only(cm) || is_lossless_requested(&cpi->oxcf.rc_cfg) || |
| cpi->svc.temporal_layer_id > 0 || |
| p_rc->avg_frame_qindex[INTER_FRAME] < qp_thresh || |
| (cpi->svc.number_spatial_layers > 1 && |
| cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame) || |
| (rc->frames_since_key > 20 && |
| p_rc->avg_frame_qindex[INTER_FRAME] > qp_max_thresh) || |
| (rc->avg_frame_low_motion && rc->avg_frame_low_motion < 45 && |
| rc->frames_since_key > 40)) { |
| cr->apply_cyclic_refresh = 0; |
| return; |
| } |
| cr->percent_refresh = 10; |
| if (cpi->svc.number_temporal_layers > 2) cr->percent_refresh = 15; |
| cr->max_qdelta_perc = 60; |
| cr->time_for_refresh = 0; |
| cr->motion_thresh = 32; |
| cr->rate_boost_fac = 15; |
| // Use larger delta-qp (increase rate_ratio_qdelta) for first few (~4) |
| // periods of the refresh cycle, after a key frame. |
| // Account for larger interval on base layer for temporal layers. |
| if (cr->percent_refresh > 0 && |
| rc->frames_since_key < |
| (4 * cpi->svc.number_temporal_layers) * (100 / cr->percent_refresh)) { |
| cr->rate_ratio_qdelta = 3.0; |
| } else { |
| cr->rate_ratio_qdelta = 2.0; |
| } |
| // Adjust some parameters for low resolutions. |
| if (cm->width * cm->height <= 352 * 288) { |
| if (rc->avg_frame_bandwidth < 3000) { |
| cr->motion_thresh = 16; |
| cr->rate_boost_fac = 13; |
| } else { |
| cr->max_qdelta_perc = 70; |
| cr->rate_ratio_qdelta = AOMMAX(cr->rate_ratio_qdelta, 2.5); |
| } |
| } |
| if (cpi->oxcf.rc_cfg.mode == AOM_VBR) { |
| // To be adjusted for VBR mode, e.g., based on gf period and boost. |
| // For now use smaller qp-delta (than CBR), no second boosted seg, and |
| // turn-off (no refresh) on golden refresh (since it's already boosted). |
| cr->percent_refresh = 10; |
| cr->rate_ratio_qdelta = 1.5; |
| cr->rate_boost_fac = 10; |
| if (cpi->refresh_frame.golden_frame) { |
| cr->percent_refresh = 0; |
| cr->rate_ratio_qdelta = 1.0; |
| } |
| } |
| // Weight for segment prior to encoding: take the average of the target |
| // number for the frame to be encoded and the actual from the previous frame. |
| // Use the target if its less. To be used for setting the base qp for the |
| // frame in av1_rc_regulate_q. |
| target_refresh = |
| cr->percent_refresh * cm->mi_params.mi_rows * cm->mi_params.mi_cols / 100; |
| weight_segment_target = (double)(target_refresh) / num4x4bl; |
| weight_segment = (double)((target_refresh + cr->actual_num_seg1_blocks + |
| cr->actual_num_seg2_blocks) >> |
| 1) / |
| num4x4bl; |
| if (weight_segment_target < 7 * weight_segment / 8) |
| weight_segment = weight_segment_target; |
| cr->weight_segment = weight_segment; |
| if (rc->rtc_external_ratectrl) { |
| cr->actual_num_seg1_blocks = cr->percent_refresh * cm->mi_params.mi_rows * |
| cm->mi_params.mi_cols / 100; |
| cr->actual_num_seg2_blocks = 0; |
| cr->weight_segment = (double)(cr->actual_num_seg1_blocks) / num4x4bl; |
| } |
| } |
| |
| // Setup cyclic background refresh: set delta q and segmentation map. |
| void av1_cyclic_refresh_setup(AV1_COMP *const cpi) { |
| AV1_COMMON *const cm = &cpi->common; |
| const RATE_CONTROL *const rc = &cpi->rc; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| struct segmentation *const seg = &cm->seg; |
| int resolution_change = |
| cm->prev_frame && (cm->width != cm->prev_frame->width || |
| cm->height != cm->prev_frame->height); |
| if (resolution_change) av1_cyclic_refresh_reset_resize(cpi); |
| if (!cr->apply_cyclic_refresh) { |
| // Set segmentation map to 0 and disable. |
| unsigned char *const seg_map = cpi->enc_seg.map; |
| memset(seg_map, 0, cm->mi_params.mi_rows * cm->mi_params.mi_cols); |
| av1_disable_segmentation(&cm->seg); |
| if (cm->current_frame.frame_type == KEY_FRAME) { |
| cr->sb_index = 0; |
| } |
| return; |
| } else { |
| const double q = av1_convert_qindex_to_q(cm->quant_params.base_qindex, |
| cm->seq_params->bit_depth); |
| // Set rate threshold to some multiple (set to 2 for now) of the target |
| // rate (target is given by sb64_target_rate and scaled by 256). |
| cr->thresh_rate_sb = ((int64_t)(rc->sb64_target_rate) << 8) << 2; |
| // Distortion threshold, quadratic in Q, scale factor to be adjusted. |
| // q will not exceed 457, so (q * q) is within 32bit; see: |
| // av1_convert_qindex_to_q(), av1_ac_quant(), ac_qlookup*[]. |
| cr->thresh_dist_sb = ((int64_t)(q * q)) << 2; |
| |
| // Set up segmentation. |
| // Clear down the segment map. |
| av1_enable_segmentation(&cm->seg); |
| av1_clearall_segfeatures(seg); |
| |
| // Note: setting temporal_update has no effect, as the seg-map coding method |
| // (temporal or spatial) is determined in |
| // av1_choose_segmap_coding_method(), |
| // based on the coding cost of each method. For error_resilient mode on the |
| // last_frame_seg_map is set to 0, so if temporal coding is used, it is |
| // relative to 0 previous map. |
| // seg->temporal_update = 0; |
| |
| // Segment BASE "Q" feature is disabled so it defaults to the baseline Q. |
| av1_disable_segfeature(seg, CR_SEGMENT_ID_BASE, SEG_LVL_ALT_Q); |
| // Use segment BOOST1 for in-frame Q adjustment. |
| av1_enable_segfeature(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q); |
| // Use segment BOOST2 for more aggressive in-frame Q adjustment. |
| av1_enable_segfeature(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q); |
| |
| // Set the q delta for segment BOOST1. |
| const CommonQuantParams *const quant_params = &cm->quant_params; |
| int qindex_delta = |
| compute_deltaq(cpi, quant_params->base_qindex, cr->rate_ratio_qdelta); |
| cr->qindex_delta[1] = qindex_delta; |
| |
| // Compute rd-mult for segment BOOST1. |
| const int qindex2 = clamp( |
| quant_params->base_qindex + quant_params->y_dc_delta_q + qindex_delta, |
| 0, MAXQ); |
| cr->rdmult = av1_compute_rd_mult(cpi, qindex2); |
| |
| av1_set_segdata(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q, qindex_delta); |
| |
| // Set a more aggressive (higher) q delta for segment BOOST2. |
| qindex_delta = compute_deltaq( |
| cpi, quant_params->base_qindex, |
| AOMMIN(CR_MAX_RATE_TARGET_RATIO, |
| 0.1 * cr->rate_boost_fac * cr->rate_ratio_qdelta)); |
| cr->qindex_delta[2] = qindex_delta; |
| av1_set_segdata(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q, qindex_delta); |
| |
| // Update the segmentation and refresh map. |
| cyclic_refresh_update_map(cpi); |
| } |
| } |
| |
| int av1_cyclic_refresh_get_rdmult(const CYCLIC_REFRESH *cr) { |
| return cr->rdmult; |
| } |
| |
| void av1_cyclic_refresh_reset_resize(AV1_COMP *const cpi) { |
| const AV1_COMMON *const cm = &cpi->common; |
| CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; |
| memset(cr->map, 0, cm->mi_params.mi_rows * cm->mi_params.mi_cols); |
| cr->sb_index = 0; |
| cpi->refresh_frame.golden_frame = true; |
| cr->apply_cyclic_refresh = 0; |
| } |
