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cobalt / cobalt / 72bde07ae3f88e8fd742a603ece725b122de47f5 / . / src / third_party / libvpx / vp9 / encoder / vp9_speed_features.c
blob: 5bbe54923689dfbf3fab41156d2a2635c60d2cba [file] [log] [blame]
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <limits.h>
#include "vp9/encoder/vp9_encoder.h"
#include "vp9/encoder/vp9_speed_features.h"
#include "vp9/encoder/vp9_rdopt.h"
#include "vpx_dsp/vpx_dsp_common.h"
// Mesh search patters for various speed settings
static MESH_PATTERN best_quality_mesh_pattern[MAX_MESH_STEP] = {
{ 64, 4 }, { 28, 2 }, { 15, 1 }, { 7, 1 }
};
#if !CONFIG_REALTIME_ONLY
// Define 3 mesh density levels to control the number of searches.
#define MESH_DENSITY_LEVELS 3
static MESH_PATTERN
good_quality_mesh_patterns[MESH_DENSITY_LEVELS][MAX_MESH_STEP] = {
{ { 64, 8 }, { 28, 4 }, { 15, 1 }, { 7, 1 } },
{ { 64, 8 }, { 14, 2 }, { 7, 1 }, { 7, 1 } },
{ { 64, 16 }, { 24, 8 }, { 12, 4 }, { 7, 1 } },
};
// Intra only frames, golden frames (except alt ref overlays) and
// alt ref frames tend to be coded at a higher than ambient quality
static int frame_is_boosted(const VP9_COMP *cpi) {
return frame_is_kf_gf_arf(cpi);
}
// Sets a partition size down to which the auto partition code will always
// search (can go lower), based on the image dimensions. The logic here
// is that the extent to which ringing artefacts are offensive, depends
// partly on the screen area that over which they propogate. Propogation is
// limited by transform block size but the screen area take up by a given block
// size will be larger for a small image format stretched to full screen.
static BLOCK_SIZE set_partition_min_limit(VP9_COMMON *const cm) {
unsigned int screen_area = (cm->width * cm->height);
// Select block size based on image format size.
if (screen_area < 1280 * 720) {
// Formats smaller in area than 720P
return BLOCK_4X4;
} else if (screen_area < 1920 * 1080) {
// Format >= 720P and < 1080P
return BLOCK_8X8;
} else {
// Formats 1080P and up
return BLOCK_16X16;
}
}
static void set_good_speed_feature_framesize_dependent(VP9_COMP *cpi,
SPEED_FEATURES *sf,
int speed) {
VP9_COMMON *const cm = &cpi->common;
const int min_frame_size = VPXMIN(cm->width, cm->height);
const int is_480p_or_larger = min_frame_size >= 480;
const int is_720p_or_larger = min_frame_size >= 720;
const int is_1080p_or_larger = min_frame_size >= 1080;
const int is_2160p_or_larger = min_frame_size >= 2160;
// speed 0 features
sf->partition_search_breakout_thr.dist = (1 << 20);
sf->partition_search_breakout_thr.rate = 80;
sf->use_square_only_thresh_high = BLOCK_SIZES;
sf->use_square_only_thresh_low = BLOCK_4X4;
if (is_480p_or_larger) {
// Currently, the machine-learning based partition search early termination
// is only used while VPXMIN(cm->width, cm->height) >= 480 and speed = 0.
sf->rd_ml_partition.search_early_termination = 1;
} else {
sf->use_square_only_thresh_high = BLOCK_32X32;
}
if (!is_1080p_or_larger) {
sf->rd_ml_partition.search_breakout = 1;
if (is_720p_or_larger) {
sf->rd_ml_partition.search_breakout_thresh[0] = 0.0f;
sf->rd_ml_partition.search_breakout_thresh[1] = 0.0f;
sf->rd_ml_partition.search_breakout_thresh[2] = 0.0f;
} else {
sf->rd_ml_partition.search_breakout_thresh[0] = 2.5f;
sf->rd_ml_partition.search_breakout_thresh[1] = 1.5f;
sf->rd_ml_partition.search_breakout_thresh[2] = 1.5f;
}
}
if (speed >= 1) {
sf->rd_ml_partition.search_early_termination = 0;
sf->rd_ml_partition.search_breakout = 1;
if (is_480p_or_larger)
sf->use_square_only_thresh_high = BLOCK_64X64;
else
sf->use_square_only_thresh_high = BLOCK_32X32;
sf->use_square_only_thresh_low = BLOCK_16X16;
if (is_720p_or_larger) {
sf->disable_split_mask =
cm->show_frame ? DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
sf->partition_search_breakout_thr.dist = (1 << 22);
sf->rd_ml_partition.search_breakout_thresh[0] = -5.0f;
sf->rd_ml_partition.search_breakout_thresh[1] = -5.0f;
sf->rd_ml_partition.search_breakout_thresh[2] = -9.0f;
} else {
sf->disable_split_mask = DISABLE_COMPOUND_SPLIT;
sf->partition_search_breakout_thr.dist = (1 << 21);
sf->rd_ml_partition.search_breakout_thresh[0] = -1.0f;
sf->rd_ml_partition.search_breakout_thresh[1] = -1.0f;
sf->rd_ml_partition.search_breakout_thresh[2] = -1.0f;
}
#if CONFIG_VP9_HIGHBITDEPTH
if (cpi->Source->flags & YV12_FLAG_HIGHBITDEPTH) {
sf->rd_ml_partition.search_breakout_thresh[0] -= 1.0f;
sf->rd_ml_partition.search_breakout_thresh[1] -= 1.0f;
sf->rd_ml_partition.search_breakout_thresh[2] -= 1.0f;
}
#endif // CONFIG_VP9_HIGHBITDEPTH
}
if (speed >= 2) {
sf->use_square_only_thresh_high = BLOCK_4X4;
sf->use_square_only_thresh_low = BLOCK_SIZES;
if (is_720p_or_larger) {
sf->disable_split_mask =
cm->show_frame ? DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
sf->adaptive_pred_interp_filter = 0;
sf->partition_search_breakout_thr.dist = (1 << 24);
sf->partition_search_breakout_thr.rate = 120;
sf->rd_ml_partition.search_breakout = 0;
} else {
sf->disable_split_mask = LAST_AND_INTRA_SPLIT_ONLY;
sf->partition_search_breakout_thr.dist = (1 << 22);
sf->partition_search_breakout_thr.rate = 100;
sf->rd_ml_partition.search_breakout_thresh[0] = 0.0f;
sf->rd_ml_partition.search_breakout_thresh[1] = -1.0f;
sf->rd_ml_partition.search_breakout_thresh[2] = -4.0f;
}
sf->rd_auto_partition_min_limit = set_partition_min_limit(cm);
// Use a set of speed features for 4k videos.
if (is_2160p_or_larger) {
sf->use_square_partition_only = 1;
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC;
sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC;
sf->alt_ref_search_fp = 1;
sf->cb_pred_filter_search = 1;
sf->adaptive_interp_filter_search = 1;
sf->disable_split_mask = DISABLE_ALL_SPLIT;
}
}
if (speed >= 3) {
sf->rd_ml_partition.search_breakout = 0;
if (is_720p_or_larger) {
sf->disable_split_mask = DISABLE_ALL_SPLIT;
sf->schedule_mode_search = cm->base_qindex < 220 ? 1 : 0;
sf->partition_search_breakout_thr.dist = (1 << 25);
sf->partition_search_breakout_thr.rate = 200;
} else {
sf->max_intra_bsize = BLOCK_32X32;
sf->disable_split_mask = DISABLE_ALL_INTER_SPLIT;
sf->schedule_mode_search = cm->base_qindex < 175 ? 1 : 0;
sf->partition_search_breakout_thr.dist = (1 << 23);
sf->partition_search_breakout_thr.rate = 120;
}
}
// If this is a two pass clip that fits the criteria for animated or
// graphics content then reset disable_split_mask for speeds 1-4.
// Also if the image edge is internal to the coded area.
if ((speed >= 1) && (cpi->oxcf.pass == 2) &&
((cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) ||
(vp9_internal_image_edge(cpi)))) {
sf->disable_split_mask = DISABLE_COMPOUND_SPLIT;
}
if (speed >= 4) {
sf->partition_search_breakout_thr.rate = 300;
if (is_720p_or_larger) {
sf->partition_search_breakout_thr.dist = (1 << 26);
} else {
sf->partition_search_breakout_thr.dist = (1 << 24);
}
sf->disable_split_mask = DISABLE_ALL_SPLIT;
}
if (speed >= 5) {
sf->partition_search_breakout_thr.rate = 500;
}
}
static double tx_dom_thresholds[6] = { 99.0, 14.0, 12.0, 8.0, 4.0, 0.0 };
static double qopt_thresholds[6] = { 99.0, 12.0, 10.0, 4.0, 2.0, 0.0 };
static void set_good_speed_feature_framesize_independent(VP9_COMP *cpi,
VP9_COMMON *cm,
SPEED_FEATURES *sf,
int speed) {
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
const int boosted = frame_is_boosted(cpi);
int i;
sf->tx_size_search_breakout = 1;
sf->adaptive_rd_thresh = 1;
sf->adaptive_rd_thresh_row_mt = 0;
sf->allow_skip_recode = 1;
sf->less_rectangular_check = 1;
sf->use_square_partition_only = !boosted;
sf->prune_ref_frame_for_rect_partitions = 1;
sf->rd_ml_partition.var_pruning = 1;
sf->rd_ml_partition.prune_rect_thresh[0] = -1;
sf->rd_ml_partition.prune_rect_thresh[1] = 350;
sf->rd_ml_partition.prune_rect_thresh[2] = 325;
sf->rd_ml_partition.prune_rect_thresh[3] = 250;
if (cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) {
sf->exhaustive_searches_thresh = (1 << 22);
} else {
sf->exhaustive_searches_thresh = INT_MAX;
}
for (i = 0; i < MAX_MESH_STEP; ++i) {
const int mesh_density_level = 0;
sf->mesh_patterns[i].range =
good_quality_mesh_patterns[mesh_density_level][i].range;
sf->mesh_patterns[i].interval =
good_quality_mesh_patterns[mesh_density_level][i].interval;
}
if (speed >= 1) {
sf->temporal_filter_search_method = NSTEP;
sf->rd_ml_partition.var_pruning = !boosted;
sf->rd_ml_partition.prune_rect_thresh[1] = 225;
sf->rd_ml_partition.prune_rect_thresh[2] = 225;
sf->rd_ml_partition.prune_rect_thresh[3] = 225;
if (oxcf->pass == 2) {
TWO_PASS *const twopass = &cpi->twopass;
if ((twopass->fr_content_type == FC_GRAPHICS_ANIMATION) ||
vp9_internal_image_edge(cpi)) {
sf->use_square_partition_only = !boosted;
} else {
sf->use_square_partition_only = !frame_is_intra_only(cm);
}
} else {
sf->use_square_partition_only = !frame_is_intra_only(cm);
}
sf->allow_txfm_domain_distortion = 1;
sf->tx_domain_thresh = tx_dom_thresholds[(speed < 6) ? speed : 5];
sf->allow_quant_coeff_opt = sf->optimize_coefficients;
sf->quant_opt_thresh = qopt_thresholds[(speed < 6) ? speed : 5];
sf->less_rectangular_check = 1;
sf->use_rd_breakout = 1;
sf->adaptive_motion_search = 1;
sf->mv.auto_mv_step_size = 1;
sf->adaptive_rd_thresh = 2;
sf->mv.subpel_search_level = 1;
if (cpi->oxcf.content != VP9E_CONTENT_FILM) sf->mode_skip_start = 10;
sf->adaptive_pred_interp_filter = 1;
sf->allow_acl = 0;
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC_H_V;
if (cpi->oxcf.content != VP9E_CONTENT_FILM) {
sf->intra_y_mode_mask[TX_16X16] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_16X16] = INTRA_DC_H_V;
}
sf->recode_tolerance_low = 15;
sf->recode_tolerance_high = 30;
sf->exhaustive_searches_thresh =
(cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) ? (1 << 23)
: INT_MAX;
sf->use_accurate_subpel_search = USE_4_TAPS;
}
if (speed >= 2) {
sf->rd_ml_partition.var_pruning = 0;
if (oxcf->vbr_corpus_complexity)
sf->recode_loop = ALLOW_RECODE_FIRST;
else
sf->recode_loop = ALLOW_RECODE_KFARFGF;
sf->tx_size_search_method =
frame_is_boosted(cpi) ? USE_FULL_RD : USE_LARGESTALL;
// Reference masking is not supported in dynamic scaling mode.
sf->reference_masking = oxcf->resize_mode != RESIZE_DYNAMIC ? 1 : 0;
sf->mode_search_skip_flags =
(cm->frame_type == KEY_FRAME)
? 0
: FLAG_SKIP_INTRA_DIRMISMATCH | FLAG_SKIP_INTRA_BESTINTER |
FLAG_SKIP_COMP_BESTINTRA | FLAG_SKIP_INTRA_LOWVAR;
sf->disable_filter_search_var_thresh = 100;
sf->comp_inter_joint_search_thresh = BLOCK_SIZES;
sf->auto_min_max_partition_size = RELAXED_NEIGHBORING_MIN_MAX;
sf->recode_tolerance_low = 15;
sf->recode_tolerance_high = 45;
sf->enhanced_full_pixel_motion_search = 0;
sf->prune_ref_frame_for_rect_partitions = 0;
sf->rd_ml_partition.prune_rect_thresh[1] = -1;
sf->rd_ml_partition.prune_rect_thresh[2] = -1;
sf->rd_ml_partition.prune_rect_thresh[3] = -1;
sf->mv.subpel_search_level = 0;
if (cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) {
for (i = 0; i < MAX_MESH_STEP; ++i) {
int mesh_density_level = 1;
sf->mesh_patterns[i].range =
good_quality_mesh_patterns[mesh_density_level][i].range;
sf->mesh_patterns[i].interval =
good_quality_mesh_patterns[mesh_density_level][i].interval;
}
}
sf->use_accurate_subpel_search = USE_2_TAPS;
}
if (speed >= 3) {
sf->use_square_partition_only = !frame_is_intra_only(cm);
sf->tx_size_search_method =
frame_is_intra_only(cm) ? USE_FULL_RD : USE_LARGESTALL;
sf->mv.subpel_search_method = SUBPEL_TREE_PRUNED;
sf->adaptive_pred_interp_filter = 0;
sf->adaptive_mode_search = 1;
sf->cb_partition_search = !boosted;
sf->cb_pred_filter_search = 1;
sf->alt_ref_search_fp = 1;
sf->recode_loop = ALLOW_RECODE_KFMAXBW;
sf->adaptive_rd_thresh = 3;
sf->mode_skip_start = 6;
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC;
sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC;
sf->adaptive_interp_filter_search = 1;
sf->allow_partition_search_skip = 1;
if (cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) {
for (i = 0; i < MAX_MESH_STEP; ++i) {
int mesh_density_level = 2;
sf->mesh_patterns[i].range =
good_quality_mesh_patterns[mesh_density_level][i].range;
sf->mesh_patterns[i].interval =
good_quality_mesh_patterns[mesh_density_level][i].interval;
}
}
}
if (speed >= 4) {
sf->use_square_partition_only = 1;
sf->tx_size_search_method = USE_LARGESTALL;
sf->mv.search_method = BIGDIA;
sf->mv.subpel_search_method = SUBPEL_TREE_PRUNED_MORE;
sf->adaptive_rd_thresh = 4;
if (cm->frame_type != KEY_FRAME)
sf->mode_search_skip_flags |= FLAG_EARLY_TERMINATE;
sf->disable_filter_search_var_thresh = 200;
sf->use_lp32x32fdct = 1;
sf->use_fast_coef_updates = ONE_LOOP_REDUCED;
sf->use_fast_coef_costing = 1;
sf->motion_field_mode_search = !boosted;
}
if (speed >= 5) {
int i;
sf->optimize_coefficients = 0;
sf->mv.search_method = HEX;
sf->disable_filter_search_var_thresh = 500;
for (i = 0; i < TX_SIZES; ++i) {
sf->intra_y_mode_mask[i] = INTRA_DC;
sf->intra_uv_mode_mask[i] = INTRA_DC;
}
sf->mv.reduce_first_step_size = 1;
sf->simple_model_rd_from_var = 1;
}
}
#endif // !CONFIG_REALTIME_ONLY
static void set_rt_speed_feature_framesize_dependent(VP9_COMP *cpi,
SPEED_FEATURES *sf,
int speed) {
VP9_COMMON *const cm = &cpi->common;
if (speed >= 1) {
if (VPXMIN(cm->width, cm->height) >= 720) {
sf->disable_split_mask =
cm->show_frame ? DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
} else {
sf->disable_split_mask = DISABLE_COMPOUND_SPLIT;
}
}
if (speed >= 2) {
if (VPXMIN(cm->width, cm->height) >= 720) {
sf->disable_split_mask =
cm->show_frame ? DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
} else {
sf->disable_split_mask = LAST_AND_INTRA_SPLIT_ONLY;
}
}
if (speed >= 5) {
sf->partition_search_breakout_thr.rate = 200;
if (VPXMIN(cm->width, cm->height) >= 720) {
sf->partition_search_breakout_thr.dist = (1 << 25);
} else {
sf->partition_search_breakout_thr.dist = (1 << 23);
}
}
if (speed >= 7) {
sf->encode_breakout_thresh =
(VPXMIN(cm->width, cm->height) >= 720) ? 800 : 300;
}
}
static void set_rt_speed_feature_framesize_independent(
VP9_COMP *cpi, SPEED_FEATURES *sf, int speed, vp9e_tune_content content) {
VP9_COMMON *const cm = &cpi->common;
SVC *const svc = &cpi->svc;
const int is_keyframe = cm->frame_type == KEY_FRAME;
const int frames_since_key = is_keyframe ? 0 : cpi->rc.frames_since_key;
sf->static_segmentation = 0;
sf->adaptive_rd_thresh = 1;
sf->adaptive_rd_thresh_row_mt = 0;
sf->use_fast_coef_costing = 1;
sf->exhaustive_searches_thresh = INT_MAX;
sf->allow_acl = 0;
sf->copy_partition_flag = 0;
sf->use_source_sad = 0;
sf->use_simple_block_yrd = 0;
sf->adapt_partition_source_sad = 0;
sf->use_altref_onepass = 0;
sf->use_compound_nonrd_pickmode = 0;
sf->nonrd_keyframe = 0;
sf->svc_use_lowres_part = 0;
sf->overshoot_detection_cbr_rt = NO_DETECTION;
sf->disable_16x16part_nonkey = 0;
sf->disable_golden_ref = 0;
sf->enable_tpl_model = 0;
sf->enhanced_full_pixel_motion_search = 0;
sf->use_accurate_subpel_search = USE_2_TAPS;
sf->nonrd_use_ml_partition = 0;
sf->variance_part_thresh_mult = 1;
sf->cb_pred_filter_search = 0;
sf->force_smooth_interpol = 0;
sf->rt_intra_dc_only_low_content = 0;
sf->mv.enable_adaptive_subpel_force_stop = 0;
if (speed >= 1) {
sf->allow_txfm_domain_distortion = 1;
sf->tx_domain_thresh = 0.0;
sf->allow_quant_coeff_opt = 0;
sf->quant_opt_thresh = 0.0;
sf->use_square_partition_only = !frame_is_intra_only(cm);
sf->less_rectangular_check = 1;
sf->tx_size_search_method =
frame_is_intra_only(cm) ? USE_FULL_RD : USE_LARGESTALL;
sf->use_rd_breakout = 1;
sf->adaptive_motion_search = 1;
sf->adaptive_pred_interp_filter = 1;
sf->mv.auto_mv_step_size = 1;
sf->adaptive_rd_thresh = 2;
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_16X16] = INTRA_DC_H_V;
}
if (speed >= 2) {
sf->mode_search_skip_flags =
(cm->frame_type == KEY_FRAME)
? 0
: FLAG_SKIP_INTRA_DIRMISMATCH | FLAG_SKIP_INTRA_BESTINTER |
FLAG_SKIP_COMP_BESTINTRA | FLAG_SKIP_INTRA_LOWVAR;
sf->adaptive_pred_interp_filter = 2;
// Reference masking only enabled for 1 spatial layer, and if none of the
// references have been scaled. The latter condition needs to be checked
// for external or internal dynamic resize.
sf->reference_masking = (svc->number_spatial_layers == 1);
if (sf->reference_masking == 1 &&
(cpi->external_resize == 1 ||
cpi->oxcf.resize_mode == RESIZE_DYNAMIC)) {
MV_REFERENCE_FRAME ref_frame;
static const int flag_list[4] = { 0, VP9_LAST_FLAG, VP9_GOLD_FLAG,
VP9_ALT_FLAG };
for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, ref_frame);
if (yv12 != NULL && (cpi->ref_frame_flags & flag_list[ref_frame])) {
const struct scale_factors *const scale_fac =
&cm->frame_refs[ref_frame - 1].sf;
if (vp9_is_scaled(scale_fac)) sf->reference_masking = 0;
}
}
}
sf->disable_filter_search_var_thresh = 50;
sf->comp_inter_joint_search_thresh = BLOCK_SIZES;
sf->auto_min_max_partition_size = RELAXED_NEIGHBORING_MIN_MAX;
sf->lf_motion_threshold = LOW_MOTION_THRESHOLD;
sf->adjust_partitioning_from_last_frame = 1;
sf->last_partitioning_redo_frequency = 3;
sf->use_lp32x32fdct = 1;
sf->mode_skip_start = 11;
sf->intra_y_mode_mask[TX_16X16] = INTRA_DC_H_V;
}
if (speed >= 3) {
sf->use_square_partition_only = 1;
sf->disable_filter_search_var_thresh = 100;
sf->use_uv_intra_rd_estimate = 1;
sf->skip_encode_sb = 1;
sf->mv.subpel_search_level = 0;
sf->adaptive_rd_thresh = 4;
sf->mode_skip_start = 6;
sf->allow_skip_recode = 0;
sf->optimize_coefficients = 0;
sf->disable_split_mask = DISABLE_ALL_SPLIT;
sf->lpf_pick = LPF_PICK_FROM_Q;
}
if (speed >= 4) {
int i;
if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0)
sf->use_altref_onepass = 1;
sf->mv.subpel_force_stop = QUARTER_PEL;
for (i = 0; i < TX_SIZES; i++) {
sf->intra_y_mode_mask[i] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[i] = INTRA_DC;
}
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC;
sf->frame_parameter_update = 0;
sf->mv.search_method = FAST_HEX;
sf->allow_skip_recode = 0;
sf->max_intra_bsize = BLOCK_32X32;
sf->use_fast_coef_costing = 0;
sf->use_quant_fp = !is_keyframe;
sf->inter_mode_mask[BLOCK_32X32] = INTER_NEAREST_NEW_ZERO;
sf->inter_mode_mask[BLOCK_32X64] = INTER_NEAREST_NEW_ZERO;
sf->inter_mode_mask[BLOCK_64X32] = INTER_NEAREST_NEW_ZERO;
sf->inter_mode_mask[BLOCK_64X64] = INTER_NEAREST_NEW_ZERO;
sf->adaptive_rd_thresh = 2;
sf->use_fast_coef_updates = is_keyframe ? TWO_LOOP : ONE_LOOP_REDUCED;
sf->mode_search_skip_flags = FLAG_SKIP_INTRA_DIRMISMATCH;
sf->tx_size_search_method = is_keyframe ? USE_LARGESTALL : USE_TX_8X8;
sf->partition_search_type = VAR_BASED_PARTITION;
}
if (speed >= 5) {
sf->use_altref_onepass = 0;
sf->use_quant_fp = !is_keyframe;
sf->auto_min_max_partition_size =
is_keyframe ? RELAXED_NEIGHBORING_MIN_MAX : STRICT_NEIGHBORING_MIN_MAX;
sf->default_max_partition_size = BLOCK_32X32;
sf->default_min_partition_size = BLOCK_8X8;
sf->force_frame_boost =
is_keyframe ||
(frames_since_key % (sf->last_partitioning_redo_frequency << 1) == 1);
sf->max_delta_qindex = is_keyframe ? 20 : 15;
sf->partition_search_type = REFERENCE_PARTITION;
if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0 &&
cpi->rc.is_src_frame_alt_ref) {
sf->partition_search_type = VAR_BASED_PARTITION;
}
sf->use_nonrd_pick_mode = 1;
sf->allow_skip_recode = 0;
sf->inter_mode_mask[BLOCK_32X32] = INTER_NEAREST_NEW_ZERO;
sf->inter_mode_mask[BLOCK_32X64] = INTER_NEAREST_NEW_ZERO;
sf->inter_mode_mask[BLOCK_64X32] = INTER_NEAREST_NEW_ZERO;
sf->inter_mode_mask[BLOCK_64X64] = INTER_NEAREST_NEW_ZERO;
sf->adaptive_rd_thresh = 2;
// This feature is only enabled when partition search is disabled.
sf->reuse_inter_pred_sby = 1;
sf->coeff_prob_appx_step = 4;
sf->use_fast_coef_updates = is_keyframe ? TWO_LOOP : ONE_LOOP_REDUCED;
sf->mode_search_skip_flags = FLAG_SKIP_INTRA_DIRMISMATCH;
sf->tx_size_search_method = is_keyframe ? USE_LARGESTALL : USE_TX_8X8;
sf->simple_model_rd_from_var = 1;
if (cpi->oxcf.rc_mode == VPX_VBR) sf->mv.search_method = NSTEP;
if (!is_keyframe) {
int i;
if (content == VP9E_CONTENT_SCREEN) {
for (i = 0; i < BLOCK_SIZES; ++i)
if (i >= BLOCK_32X32)
sf->intra_y_mode_bsize_mask[i] = INTRA_DC_H_V;
else
sf->intra_y_mode_bsize_mask[i] = INTRA_DC_TM_H_V;
} else {
for (i = 0; i < BLOCK_SIZES; ++i)
if (i > BLOCK_16X16)
sf->intra_y_mode_bsize_mask[i] = INTRA_DC;
else
// Use H and V intra mode for block sizes <= 16X16.
sf->intra_y_mode_bsize_mask[i] = INTRA_DC_H_V;
}
}
if (content == VP9E_CONTENT_SCREEN) {
sf->short_circuit_flat_blocks = 1;
}
if (cpi->oxcf.rc_mode == VPX_CBR &&
cpi->oxcf.content != VP9E_CONTENT_SCREEN) {
sf->limit_newmv_early_exit = 1;
if (!cpi->use_svc) sf->bias_golden = 1;
}
// Keep nonrd_keyframe = 1 for non-base spatial layers to prevent
// increase in encoding time.
if (cpi->use_svc && svc->spatial_layer_id > 0) sf->nonrd_keyframe = 1;
if (cm->frame_type != KEY_FRAME && cpi->resize_state == ORIG &&
cpi->oxcf.rc_mode == VPX_CBR) {
if (cm->width * cm->height <= 352 * 288 && !cpi->use_svc &&
cpi->oxcf.content != VP9E_CONTENT_SCREEN)
sf->overshoot_detection_cbr_rt = RE_ENCODE_MAXQ;
else
sf->overshoot_detection_cbr_rt = FAST_DETECTION_MAXQ;
}
if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0 &&
cm->width <= 1280 && cm->height <= 720) {
sf->use_altref_onepass = 1;
sf->use_compound_nonrd_pickmode = 1;
}
if (cm->width * cm->height > 1280 * 720) sf->cb_pred_filter_search = 1;
if (!cpi->external_resize) sf->use_source_sad = 1;
}
if (speed >= 6) {
if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0) {
sf->use_altref_onepass = 1;
sf->use_compound_nonrd_pickmode = 1;
}
sf->partition_search_type = VAR_BASED_PARTITION;
sf->mv.search_method = NSTEP;
sf->mv.reduce_first_step_size = 1;
sf->skip_encode_sb = 0;
if (sf->use_source_sad) {
sf->adapt_partition_source_sad = 1;
sf->adapt_partition_thresh =
(cm->width * cm->height <= 640 * 360) ? 40000 : 60000;
if (cpi->content_state_sb_fd == NULL &&
(!cpi->use_svc ||
svc->spatial_layer_id == svc->number_spatial_layers - 1)) {
cpi->content_state_sb_fd = (uint8_t *)vpx_calloc(
(cm->mi_stride >> 3) * ((cm->mi_rows >> 3) + 1), sizeof(uint8_t));
}
}
if (cpi->oxcf.rc_mode == VPX_CBR && content != VP9E_CONTENT_SCREEN) {
// Enable short circuit for low temporal variance.
sf->short_circuit_low_temp_var = 1;
}
if (svc->temporal_layer_id > 0) {
sf->adaptive_rd_thresh = 4;
sf->limit_newmv_early_exit = 0;
sf->base_mv_aggressive = 1;
}
if (cm->frame_type != KEY_FRAME && cpi->resize_state == ORIG &&
cpi->oxcf.rc_mode == VPX_CBR)
sf->overshoot_detection_cbr_rt = FAST_DETECTION_MAXQ;
}
if (speed >= 7) {
sf->adapt_partition_source_sad = 0;
sf->adaptive_rd_thresh = 3;
sf->mv.search_method = FAST_DIAMOND;
sf->mv.fullpel_search_step_param = 10;
// For SVC: use better mv search on base temporal layer, and only
// on base spatial layer if highest resolution is above 640x360.
if (svc->number_temporal_layers > 2 && svc->temporal_layer_id == 0 &&
(svc->spatial_layer_id == 0 ||
cpi->oxcf.width * cpi->oxcf.height <= 640 * 360)) {
sf->mv.search_method = NSTEP;
sf->mv.fullpel_search_step_param = 6;
}
if (svc->temporal_layer_id > 0 || svc->spatial_layer_id > 1) {
sf->use_simple_block_yrd = 1;
if (svc->non_reference_frame)
sf->mv.subpel_search_method = SUBPEL_TREE_PRUNED_EVENMORE;
}
if (cpi->use_svc && cpi->row_mt && cpi->oxcf.max_threads > 1)
sf->adaptive_rd_thresh_row_mt = 1;
// Enable partition copy. For SVC only enabled for top spatial resolution
// layer.
cpi->max_copied_frame = 0;
if (!cpi->last_frame_dropped && cpi->resize_state == ORIG &&
!cpi->external_resize &&
(!cpi->use_svc ||
(svc->spatial_layer_id == svc->number_spatial_layers - 1 &&
!svc->last_layer_dropped[svc->number_spatial_layers - 1]))) {
sf->copy_partition_flag = 1;
cpi->max_copied_frame = 2;
// The top temporal enhancement layer (for number of temporal layers > 1)
// are non-reference frames, so use large/max value for max_copied_frame.
if (svc->number_temporal_layers > 1 &&
svc->temporal_layer_id == svc->number_temporal_layers - 1)
cpi->max_copied_frame = 255;
}
// For SVC: enable use of lower resolution partition for higher resolution,
// only for 3 spatial layers and when config/top resolution is above VGA.
// Enable only for non-base temporal layer frames.
if (cpi->use_svc && svc->use_partition_reuse &&
svc->number_spatial_layers == 3 && svc->temporal_layer_id > 0 &&
cpi->oxcf.width * cpi->oxcf.height > 640 * 480)
sf->svc_use_lowres_part = 1;
// For SVC when golden is used as second temporal reference: to avoid
// encode time increase only use this feature on base temporal layer.
// (i.e remove golden flag from frame_flags for temporal_layer_id > 0).
if (cpi->use_svc && svc->use_gf_temporal_ref_current_layer &&
svc->temporal_layer_id > 0)
cpi->ref_frame_flags &= (~VP9_GOLD_FLAG);
if (cm->width * cm->height > 640 * 480) sf->cb_pred_filter_search = 1;
}
if (speed >= 8) {
sf->adaptive_rd_thresh = 4;
sf->skip_encode_sb = 1;
if (cpi->svc.number_spatial_layers > 1 && !cpi->svc.simulcast_mode)
sf->nonrd_keyframe = 0;
else
sf->nonrd_keyframe = 1;
if (!cpi->use_svc) cpi->max_copied_frame = 4;
if (cpi->row_mt && cpi->oxcf.max_threads > 1)
sf->adaptive_rd_thresh_row_mt = 1;
// Enable ML based partition for low res.
if (!frame_is_intra_only(cm) && cm->width * cm->height <= 352 * 288) {
sf->nonrd_use_ml_partition = 1;
}
#if CONFIG_VP9_HIGHBITDEPTH
if (cpi->Source->flags & YV12_FLAG_HIGHBITDEPTH)
sf->nonrd_use_ml_partition = 0;
#endif
if (content == VP9E_CONTENT_SCREEN) sf->mv.subpel_force_stop = HALF_PEL;
sf->rt_intra_dc_only_low_content = 1;
if (!cpi->use_svc && cpi->oxcf.rc_mode == VPX_CBR &&
content != VP9E_CONTENT_SCREEN) {
// More aggressive short circuit for speed 8.
sf->short_circuit_low_temp_var = 3;
// Use level 2 for noisey cases as there is a regression in some
// noisy clips with level 3.
if (cpi->noise_estimate.enabled && cm->width >= 1280 &&
cm->height >= 720) {
NOISE_LEVEL noise_level =
vp9_noise_estimate_extract_level(&cpi->noise_estimate);
if (noise_level >= kMedium) sf->short_circuit_low_temp_var = 2;
}
// Since the short_circuit_low_temp_var is used, reduce the
// adaptive_rd_thresh level.
if (cm->width * cm->height > 352 * 288)
sf->adaptive_rd_thresh = 1;
else
sf->adaptive_rd_thresh = 2;
}
sf->limit_newmv_early_exit = 0;
sf->use_simple_block_yrd = 1;
if (cm->width * cm->height > 352 * 288) sf->cb_pred_filter_search = 1;
}
if (speed >= 9) {
// Only keep INTRA_DC mode for speed 9.
if (!is_keyframe) {
int i = 0;
for (i = 0; i < BLOCK_SIZES; ++i)
sf->intra_y_mode_bsize_mask[i] = INTRA_DC;
}
sf->cb_pred_filter_search = 1;
sf->mv.enable_adaptive_subpel_force_stop = 1;
sf->mv.adapt_subpel_force_stop.mv_thresh = 1;
sf->mv.adapt_subpel_force_stop.force_stop_below = QUARTER_PEL;
sf->mv.adapt_subpel_force_stop.force_stop_above = HALF_PEL;
// Disable partition blocks below 16x16, except for low-resolutions.
if (cm->frame_type != KEY_FRAME && cm->width >= 320 && cm->height >= 240)
sf->disable_16x16part_nonkey = 1;
// Allow for disabling GOLDEN reference, for CBR mode.
if (cpi->oxcf.rc_mode == VPX_CBR) sf->disable_golden_ref = 1;
if (cpi->rc.avg_frame_low_motion < 70) sf->default_interp_filter = BILINEAR;
if (cm->width * cm->height >= 640 * 360) sf->variance_part_thresh_mult = 2;
}
// Disable split to 8x8 for low-resolution at very high Q.
// For variance partition (speed >= 6). Ignore the first few frames
// as avg_frame_qindex starts at max_q (worst_quality).
if (cm->frame_type != KEY_FRAME && cm->width * cm->height <= 320 * 240 &&
sf->partition_search_type == VAR_BASED_PARTITION &&
cpi->rc.avg_frame_qindex[INTER_FRAME] > 208 &&
cpi->common.current_video_frame > 8)
sf->disable_16x16part_nonkey = 1;
if (sf->nonrd_use_ml_partition)
sf->partition_search_type = ML_BASED_PARTITION;
if (sf->use_altref_onepass) {
if (cpi->rc.is_src_frame_alt_ref && cm->frame_type != KEY_FRAME) {
sf->partition_search_type = FIXED_PARTITION;
sf->always_this_block_size = BLOCK_64X64;
}
if (cpi->count_arf_frame_usage == NULL)
cpi->count_arf_frame_usage =
(uint8_t *)vpx_calloc((cm->mi_stride >> 3) * ((cm->mi_rows >> 3) + 1),
sizeof(*cpi->count_arf_frame_usage));
if (cpi->count_lastgolden_frame_usage == NULL)
cpi->count_lastgolden_frame_usage =
(uint8_t *)vpx_calloc((cm->mi_stride >> 3) * ((cm->mi_rows >> 3) + 1),
sizeof(*cpi->count_lastgolden_frame_usage));
}
if (svc->previous_frame_is_intra_only) {
sf->partition_search_type = FIXED_PARTITION;
sf->always_this_block_size = BLOCK_64X64;
}
// Special case for screen content: increase motion search on base spatial
// layer when high motion is detected or previous SL0 frame was dropped.
if (cpi->oxcf.content == VP9E_CONTENT_SCREEN && cpi->oxcf.speed >= 5 &&
(svc->high_num_blocks_with_motion || svc->last_layer_dropped[0])) {
sf->mv.search_method = NSTEP;
// TODO(marpan/jianj): Tune this setting for screensharing. For now use
// small step_param for all spatial layers.
sf->mv.fullpel_search_step_param = 2;
}
// TODO(marpan): There is regression for aq-mode=3 speed <= 4, force it
// off for now.
if (speed <= 3 && cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
cpi->oxcf.aq_mode = 0;
}
void vp9_set_speed_features_framesize_dependent(VP9_COMP *cpi, int speed) {
SPEED_FEATURES *const sf = &cpi->sf;
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
RD_OPT *const rd = &cpi->rd;
int i;
// best quality defaults
// Some speed-up features even for best quality as minimal impact on quality.
sf->partition_search_breakout_thr.dist = (1 << 19);
sf->partition_search_breakout_thr.rate = 80;
sf->rd_ml_partition.search_early_termination = 0;
sf->rd_ml_partition.search_breakout = 0;
if (oxcf->mode == REALTIME)
set_rt_speed_feature_framesize_dependent(cpi, sf, speed);
#if !CONFIG_REALTIME_ONLY
else if (oxcf->mode == GOOD)
set_good_speed_feature_framesize_dependent(cpi, sf, speed);
#endif
if (sf->disable_split_mask == DISABLE_ALL_SPLIT) {
sf->adaptive_pred_interp_filter = 0;
}
if (cpi->encode_breakout && oxcf->mode == REALTIME &&
sf->encode_breakout_thresh > cpi->encode_breakout) {
cpi->encode_breakout = sf->encode_breakout_thresh;
}
// Check for masked out split cases.
for (i = 0; i < MAX_REFS; ++i) {
if (sf->disable_split_mask & (1 << i)) {
rd->thresh_mult_sub8x8[i] = INT_MAX;
}
}
// With row based multi-threading, the following speed features
// have to be disabled to guarantee that bitstreams encoded with single thread
// and multiple threads match.
// It can be used in realtime when adaptive_rd_thresh_row_mt is enabled since
// adaptive_rd_thresh is defined per-row for non-rd pickmode.
if (!sf->adaptive_rd_thresh_row_mt && cpi->row_mt_bit_exact &&
oxcf->max_threads > 1)
sf->adaptive_rd_thresh = 0;
}
void vp9_set_speed_features_framesize_independent(VP9_COMP *cpi, int speed) {
SPEED_FEATURES *const sf = &cpi->sf;
#if !CONFIG_REALTIME_ONLY
VP9_COMMON *const cm = &cpi->common;
#endif
MACROBLOCK *const x = &cpi->td.mb;
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
int i;
// best quality defaults
sf->frame_parameter_update = 1;
sf->mv.search_method = NSTEP;
sf->recode_loop = ALLOW_RECODE_FIRST;
sf->mv.subpel_search_method = SUBPEL_TREE;
sf->mv.subpel_search_level = 2;
sf->mv.subpel_force_stop = EIGHTH_PEL;
sf->optimize_coefficients = !is_lossless_requested(&cpi->oxcf);
sf->mv.reduce_first_step_size = 0;
sf->coeff_prob_appx_step = 1;
sf->mv.auto_mv_step_size = 0;
sf->mv.fullpel_search_step_param = 6;
sf->comp_inter_joint_search_thresh = BLOCK_4X4;
sf->tx_size_search_method = USE_FULL_RD;
sf->use_lp32x32fdct = 0;
sf->adaptive_motion_search = 0;
sf->enhanced_full_pixel_motion_search = 1;
sf->adaptive_pred_interp_filter = 0;
sf->adaptive_mode_search = 0;
sf->cb_pred_filter_search = 0;
sf->cb_partition_search = 0;
sf->motion_field_mode_search = 0;
sf->alt_ref_search_fp = 0;
sf->use_quant_fp = 0;
sf->reference_masking = 0;
sf->partition_search_type = SEARCH_PARTITION;
sf->less_rectangular_check = 0;
sf->use_square_partition_only = 0;
sf->use_square_only_thresh_high = BLOCK_SIZES;
sf->use_square_only_thresh_low = BLOCK_4X4;
sf->auto_min_max_partition_size = NOT_IN_USE;
sf->rd_auto_partition_min_limit = BLOCK_4X4;
sf->default_max_partition_size = BLOCK_64X64;
sf->default_min_partition_size = BLOCK_4X4;
sf->adjust_partitioning_from_last_frame = 0;
sf->last_partitioning_redo_frequency = 4;
sf->disable_split_mask = 0;
sf->mode_search_skip_flags = 0;
sf->force_frame_boost = 0;
sf->max_delta_qindex = 0;
sf->disable_filter_search_var_thresh = 0;
sf->adaptive_interp_filter_search = 0;
sf->allow_partition_search_skip = 0;
sf->allow_txfm_domain_distortion = 0;
sf->tx_domain_thresh = 99.0;
sf->allow_quant_coeff_opt = sf->optimize_coefficients;
sf->quant_opt_thresh = 99.0;
sf->allow_acl = 1;
sf->enable_tpl_model = oxcf->enable_tpl_model;
sf->prune_ref_frame_for_rect_partitions = 0;
sf->temporal_filter_search_method = MESH;
for (i = 0; i < TX_SIZES; i++) {
sf->intra_y_mode_mask[i] = INTRA_ALL;
sf->intra_uv_mode_mask[i] = INTRA_ALL;
}
sf->use_rd_breakout = 0;
sf->skip_encode_sb = 0;
sf->use_uv_intra_rd_estimate = 0;
sf->allow_skip_recode = 0;
sf->lpf_pick = LPF_PICK_FROM_FULL_IMAGE;
sf->use_fast_coef_updates = TWO_LOOP;
sf->use_fast_coef_costing = 0;
sf->mode_skip_start = MAX_MODES; // Mode index at which mode skip mask set
sf->schedule_mode_search = 0;
sf->use_nonrd_pick_mode = 0;
for (i = 0; i < BLOCK_SIZES; ++i) sf->inter_mode_mask[i] = INTER_ALL;
sf->max_intra_bsize = BLOCK_64X64;
sf->reuse_inter_pred_sby = 0;
// This setting only takes effect when partition_search_type is set
// to FIXED_PARTITION.
sf->always_this_block_size = BLOCK_16X16;
sf->search_type_check_frequency = 50;
sf->encode_breakout_thresh = 0;
// Recode loop tolerance %.
sf->recode_tolerance_low = 12;
sf->recode_tolerance_high = 25;
sf->default_interp_filter = SWITCHABLE;
sf->simple_model_rd_from_var = 0;
sf->short_circuit_flat_blocks = 0;
sf->short_circuit_low_temp_var = 0;
sf->limit_newmv_early_exit = 0;
sf->bias_golden = 0;
sf->base_mv_aggressive = 0;
sf->rd_ml_partition.prune_rect_thresh[0] = -1;
sf->rd_ml_partition.prune_rect_thresh[1] = -1;
sf->rd_ml_partition.prune_rect_thresh[2] = -1;
sf->rd_ml_partition.prune_rect_thresh[3] = -1;
sf->rd_ml_partition.var_pruning = 0;
sf->use_accurate_subpel_search = USE_8_TAPS;
// Some speed-up features even for best quality as minimal impact on quality.
sf->adaptive_rd_thresh = 1;
sf->tx_size_search_breakout = 1;
sf->tx_size_search_depth = 2;
sf->exhaustive_searches_thresh =
(cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) ? (1 << 20)
: INT_MAX;
if (cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION) {
for (i = 0; i < MAX_MESH_STEP; ++i) {
sf->mesh_patterns[i].range = best_quality_mesh_pattern[i].range;
sf->mesh_patterns[i].interval = best_quality_mesh_pattern[i].interval;
}
}
if (oxcf->mode == REALTIME)
set_rt_speed_feature_framesize_independent(cpi, sf, speed, oxcf->content);
#if !CONFIG_REALTIME_ONLY
else if (oxcf->mode == GOOD)
set_good_speed_feature_framesize_independent(cpi, cm, sf, speed);
#endif
cpi->diamond_search_sad = vp9_diamond_search_sad;
// Slow quant, dct and trellis not worthwhile for first pass
// so make sure they are always turned off.
if (oxcf->pass == 1) sf->optimize_coefficients = 0;
// No recode for 1 pass.
if (oxcf->pass == 0) {
sf->recode_loop = DISALLOW_RECODE;
sf->optimize_coefficients = 0;
}
if (sf->mv.subpel_force_stop == FULL_PEL) {
// Whole pel only
cpi->find_fractional_mv_step = vp9_skip_sub_pixel_tree;
} else if (sf->mv.subpel_search_method == SUBPEL_TREE) {
cpi->find_fractional_mv_step = vp9_find_best_sub_pixel_tree;
} else if (sf->mv.subpel_search_method == SUBPEL_TREE_PRUNED) {
cpi->find_fractional_mv_step = vp9_find_best_sub_pixel_tree_pruned;
} else if (sf->mv.subpel_search_method == SUBPEL_TREE_PRUNED_MORE) {
cpi->find_fractional_mv_step = vp9_find_best_sub_pixel_tree_pruned_more;
} else if (sf->mv.subpel_search_method == SUBPEL_TREE_PRUNED_EVENMORE) {
cpi->find_fractional_mv_step = vp9_find_best_sub_pixel_tree_pruned_evenmore;
}
// This is only used in motion vector unit test.
if (cpi->oxcf.motion_vector_unit_test == 1)
cpi->find_fractional_mv_step = vp9_return_max_sub_pixel_mv;
else if (cpi->oxcf.motion_vector_unit_test == 2)
cpi->find_fractional_mv_step = vp9_return_min_sub_pixel_mv;
x->optimize = sf->optimize_coefficients == 1 && oxcf->pass != 1;
x->min_partition_size = sf->default_min_partition_size;
x->max_partition_size = sf->default_max_partition_size;
if (!cpi->oxcf.frame_periodic_boost) {
sf->max_delta_qindex = 0;
}
// With row based multi-threading, the following speed features
// have to be disabled to guarantee that bitstreams encoded with single thread
// and multiple threads match.
// It can be used in realtime when adaptive_rd_thresh_row_mt is enabled since
// adaptive_rd_thresh is defined per-row for non-rd pickmode.
if (!sf->adaptive_rd_thresh_row_mt && cpi->row_mt_bit_exact &&
oxcf->max_threads > 1)
sf->adaptive_rd_thresh = 0;
}