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Diffstat (limited to '')
| -rw-r--r-- | third_party/aom/av1/encoder/aq_cyclicrefresh.c | 657 |
1 files changed, 657 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/aq_cyclicrefresh.c b/third_party/aom/av1/encoder/aq_cyclicrefresh.c new file mode 100644 index 0000000000..f48ff11e51 --- /dev/null +++ b/third_party/aom/av1/encoder/aq_cyclicrefresh.c @@ -0,0 +1,657 @@ +/* + * 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)); + cr->counter_encode_maxq_scene_change = 0; + cr->percent_refresh_adjustment = 5; + cr->rate_ratio_qdelta_adjustment = 0.25; + 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, BLOCK_SIZE bsize, + int noise_level) { + 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 && noise_level < kMedium) || + (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; + int deltaq = av1_compute_qdelta_by_rate( + cpi, cpi->common.current_frame.frame_type, q, rate_factor); + 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 int base_qindex = cm->quant_params.base_qindex; + 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(cpi, base_qindex, correction_factor) + + weight_segment1 * + av1_estimate_bits_at_q(cpi, base_qindex + cr->qindex_delta[1], + correction_factor) + + weight_segment2 * + av1_estimate_bits_at_q(cpi, base_qindex + cr->qindex_delta[2], + correction_factor)); + 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); + const int accurate_estimate = cpi->sf.hl_sf.accurate_bit_estimate; + // Take segment weighted average for bits per mb. + bits_per_mb = + (int)((1.0 - weight_segment) * + av1_rc_bits_per_mb(cpi, cm->current_frame.frame_type, i, + correction_factor, accurate_estimate) + + weight_segment * av1_rc_bits_per_mb( + cpi, cm->current_frame.frame_type, i + deltaq, + correction_factor, accurate_estimate)); + 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, + RUN_TYPE dry_run) { + int cdf_num; + const AV1_COMMON *const cm = &cpi->common; + MACROBLOCKD *const xd = &x->e_mbd; + MB_MODE_INFO *const mbmi = xd->mi[0]; + const int 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); + + assert(cm->seg.enabled); + + if (!cr->skip_over4x4) { + mbmi->segment_id = + av1_get_spatial_seg_pred(cm, xd, &cdf_num, cr->skip_over4x4); + if (prev_segment_id != mbmi->segment_id) { + const int block_index = mi_row * cm->mi_params.mi_cols + mi_col; + const int mi_stride = cm->mi_params.mi_cols; + const uint8_t segment_id = mbmi->segment_id; + for (int mi_y = 0; mi_y < ymis; mi_y++) { + const int map_offset = block_index + mi_y * mi_stride; + memset(&cr->map[map_offset], 0, xmis); + memset(&cpi->enc_seg.map[map_offset], segment_id, xmis); + memset(&cm->cur_frame->seg_map[map_offset], segment_id, xmis); + } + } + } + if (!dry_run) { + 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; + } +} + +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; + int noise_level = 0; + if (cpi->noise_estimate.enabled) noise_level = cpi->noise_estimate.level; + const int refresh_this_block = + candidate_refresh_aq(cr, mbmi, rate, dist, bsize, noise_level); + 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; + } + const uint8_t segment_id = mbmi->segment_id; + + // 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(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. + const int mi_stride = cm->mi_params.mi_cols; + for (int mi_y = 0; mi_y < ymis; mi_y += sh) { + const int map_offset = block_index + mi_y * mi_stride; + memset(&cr->map[map_offset], new_map_value, xmis); + memset(&cpi->enc_seg.map[map_offset], segment_id, xmis); + memset(&cm->cur_frame->seg_map[map_offset], segment_id, xmis); + } + + // Accumulate cyclic refresh update counters. + if (!dry_run) { + if (cyclic_refresh_segment_id(segment_id) == CR_SEGMENT_ID_BOOST1) + x->actual_num_seg1_blocks += xmis * ymis; + else if (cyclic_refresh_segment_id(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; +} + +// 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; +} + +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; + uint64_t sb_sad = 0; + uint64_t thresh_sad_low = 0; + uint64_t thresh_sad = INT64_MAX; + const int mi_rows = mi_params->mi_rows, mi_cols = mi_params->mi_cols; + const int mi_stride = mi_cols; + memset(seg_map, CR_SEGMENT_ID_BASE, mi_rows * mi_cols); + sb_cols = (mi_cols + cm->seq_params->mib_size - 1) / cm->seq_params->mib_size; + sb_rows = (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_rows * 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->last_sb_index = 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_rows); + assert(mi_col >= 0 && mi_col < mi_cols); + bl_index = mi_row * mi_stride + mi_col; + // Loop through all MI blocks in superblock and update map. + xmis = AOMMIN(mi_cols - mi_col, cm->seq_params->mib_size); + ymis = AOMMIN(mi_rows - mi_row, cm->seq_params->mib_size); + if (cr->use_block_sad_scene_det && cpi->rc.frames_since_key > 30 && + cr->counter_encode_maxq_scene_change > 30 && + cpi->src_sad_blk_64x64 != NULL && + cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1) { + sb_sad = cpi->src_sad_blk_64x64[sb_col_index + sb_cols * sb_row_index]; + int scale = (cm->width * cm->height < 640 * 360) ? 6 : 8; + int scale_low = 2; + thresh_sad = (scale * 64 * 64); + thresh_sad_low = (scale_low * 64 * 64); + // For temporal layers: the base temporal layer (temporal_layer_id = 0) + // has larger frame separation (2 or 4 frames apart), so use larger sad + // thresholds to compensate for larger frame sad. The larger thresholds + // also increase the amount of refresh, which is needed for the base + // temporal layer. + if (cpi->svc.number_temporal_layers > 1 && + cpi->svc.temporal_layer_id == 0) { + thresh_sad <<= 4; + thresh_sad_low <<= 2; + } + } + // 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_stride + 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 low motion. + // If the block_sad (sb_sad) is very low label it for refresh anyway. + if (cr->map[bl_index2] == 0 || sb_sad < thresh_sad_low) { + 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. + // Enforce that block sad (sb_sad) is not too high. + if (sum_map >= (xmis * ymis) >> 1 && sb_sad < thresh_sad) { + set_segment_id(seg_map, bl_index, xmis, ymis, mi_stride, + 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; + if (cr->target_num_seg_blocks == 0) { + // Disable segmentation, seg_map is already set to 0 above. + av1_disable_segmentation(&cm->seg); + } +} + +static int is_scene_change_detected(AV1_COMP *const cpi) { + return cpi->rc.high_source_sad; +} + +// 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; + SVC *const svc = &cpi->svc; + const int qp_thresh = AOMMAX(16, rc->best_quality + 4); + const int qp_max_thresh = 118 * MAXQ >> 7; + const int scene_change_detected = is_scene_change_detected(cpi); + const int is_screen_content = + (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN); + + // A scene change or key frame marks the start of a cyclic refresh cycle. + const int frames_since_scene_change = + (cpi->ppi->use_svc || !is_screen_content) + ? cpi->rc.frames_since_key + : AOMMIN(cpi->rc.frames_since_key, + cr->counter_encode_maxq_scene_change); + + // Cases to reset the cyclic refresh adjustment parameters. + if (frame_is_intra_only(cm) || scene_change_detected || + cpi->ppi->rtc_ref.bias_recovery_frame) { + // Reset adaptive elements for intra only frames and scene changes. + cr->percent_refresh_adjustment = 5; + cr->rate_ratio_qdelta_adjustment = 0.25; + } + + // 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; + + // should we enable cyclic refresh on this frame. + cr->apply_cyclic_refresh = 1; + if (frame_is_intra_only(cm) || is_lossless_requested(&cpi->oxcf.rc_cfg) || + scene_change_detected || svc->temporal_layer_id > 0 || + svc->prev_number_spatial_layers != svc->number_spatial_layers || + p_rc->avg_frame_qindex[INTER_FRAME] < qp_thresh || + (svc->number_spatial_layers > 1 && + svc->layer_context[svc->temporal_layer_id].is_key_frame) || + (frames_since_scene_change > 20 && + p_rc->avg_frame_qindex[INTER_FRAME] > qp_max_thresh) || + (rc->avg_frame_low_motion && rc->avg_frame_low_motion < 30 && + frames_since_scene_change > 40) || + cpi->ppi->rtc_ref.bias_recovery_frame) { + cr->apply_cyclic_refresh = 0; + return; + } + + // Increase the amount of refresh for #temporal_layers > 2 + if (svc->number_temporal_layers > 2) + cr->percent_refresh = 15; + else + cr->percent_refresh = 10 + cr->percent_refresh_adjustment; + + cr->max_qdelta_perc = 60; + cr->time_for_refresh = 0; + cr->use_block_sad_scene_det = + (cpi->oxcf.tune_cfg.content != AOM_CONTENT_SCREEN && + cm->seq_params->sb_size == BLOCK_64X64) + ? 1 + : 0; + cr->motion_thresh = 32; + cr->rate_boost_fac = + (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN) ? 10 : 15; + + // Use larger delta-qp (increase rate_ratio_qdelta) for first few + // refresh cycles after a key frame (svc) or scene change (non svc). + // For non svc screen content, after a scene change gradually reduce + // this boost and supress it further if either of the previous two + // frames overshot. + if (cr->percent_refresh > 0) { + if (cpi->ppi->use_svc || !is_screen_content) { + if (frames_since_scene_change < + ((4 * svc->number_temporal_layers) * (100 / cr->percent_refresh))) { + cr->rate_ratio_qdelta = 3.0 + cr->rate_ratio_qdelta_adjustment; + } else { + cr->rate_ratio_qdelta = 2.25 + cr->rate_ratio_qdelta_adjustment; + } + } else { + double distance_from_sc_factor = + AOMMIN(0.75, (int)(frames_since_scene_change / 10) * 0.1); + cr->rate_ratio_qdelta = + 3.0 + cr->rate_ratio_qdelta_adjustment - distance_from_sc_factor; + if ((frames_since_scene_change < 10) && + ((cpi->rc.rc_1_frame < 0) || (cpi->rc.rc_2_frame < 0))) { + cr->rate_ratio_qdelta -= 0.25; + } + } + } else { + cr->rate_ratio_qdelta = 2.25 + cr->rate_ratio_qdelta_adjustment; + } + // Adjust some parameters for low resolutions. + if (cm->width * cm->height <= 352 * 288) { + if (cpi->svc.number_temporal_layers > 1) { + cr->motion_thresh = 32; + cr->rate_boost_fac = 13; + } else { + if (rc->avg_frame_bandwidth < 3000) { + cr->motion_thresh = 16; + cr->rate_boost_fac = 13; + } else { + cr->max_qdelta_perc = 50; + cr->rate_ratio_qdelta = AOMMAX(cr->rate_ratio_qdelta, 2.0); + } + } + } + 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; + } + } + 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; + } +} + +// 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; + const int scene_change_detected = is_scene_change_detected(cpi); + const GF_GROUP *const gf_group = &cpi->ppi->gf_group; + const int boost_index = AOMMIN(15, (cpi->ppi->p_rc.gfu_boost / 100)); + const int layer_depth = AOMMIN(gf_group->layer_depth[cpi->gf_frame_index], 6); + const FRAME_TYPE frame_type = cm->current_frame.frame_type; + + // Set resolution_change flag: for svc only set it when the + // number of spatial layers has not changed. + const int resolution_change = + cm->prev_frame && + (cm->width != cm->prev_frame->width || + cm->height != cm->prev_frame->height) && + cpi->svc.prev_number_spatial_layers == cpi->svc.number_spatial_layers; + + 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 (frame_is_intra_only(cm) || scene_change_detected || + cpi->ppi->rtc_ref.bias_recovery_frame) { + cr->sb_index = 0; + cr->last_sb_index = 0; + cr->counter_encode_maxq_scene_change = 0; + cr->actual_num_seg1_blocks = 0; + cr->actual_num_seg2_blocks = 0; + } + return; + } else { + cr->counter_encode_maxq_scene_change++; + 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; + // For low-resoln or lower speeds, the rate/dist thresholds need to be + // tuned/updated. + if (cpi->oxcf.speed <= 7 || (cm->width * cm->height < 640 * 360)) { + cr->thresh_dist_sb = 0; + cr->thresh_rate_sb = INT64_MAX; + } + // 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( + qindex2, cm->seq_params->bit_depth, + cpi->ppi->gf_group.update_type[cpi->gf_frame_index], layer_depth, + boost_index, frame_type, cpi->oxcf.q_cfg.use_fixed_qp_offsets, + is_stat_consumption_stage(cpi)); + + 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; + cr->last_sb_index = 0; + cpi->refresh_frame.golden_frame = true; + cr->apply_cyclic_refresh = 0; + cr->counter_encode_maxq_scene_change = 0; + cr->percent_refresh_adjustment = 5; + cr->rate_ratio_qdelta_adjustment = 0.25; +} + +int av1_cyclic_refresh_disable_lf_cdef(AV1_COMP *const cpi) { + CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; + const int qindex = cpi->common.quant_params.base_qindex; + if (cpi->rc.frames_since_key > 30 && cr->percent_refresh > 0 && + cr->counter_encode_maxq_scene_change > 300 / cr->percent_refresh && + cpi->rc.frame_source_sad < 1000 && + qindex < 7 * (cpi->rc.worst_quality >> 3)) + return 1; + // More aggressive skip. + else if (cpi->sf.rt_sf.skip_lf_screen > 1 && !cpi->rc.high_source_sad && + cpi->rc.frame_source_sad < 50000 && qindex < cpi->rc.worst_quality) + return 1; + return 0; +} |