av1/encoder/picklpf.c - aom - Git at Google


            
            /*

            
             * 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 <assert.h>

            
            #include <limits.h>


            #include "config/aom_scale_rtcd.h"


            #include "aom_dsp/aom_dsp_common.h"

            
            #include "aom_dsp/psnr.h"

            
            #include "aom_mem/aom_mem.h"

            
            #include "aom_ports/mem.h"


            #include "av1/common/av1_common_int.h"

            
            #include "av1/common/av1_loopfilter.h"

            
            #include "av1/common/quant_common.h"


            #include "av1/encoder/av1_quantize.h"

            
            #include "av1/encoder/encoder.h"

            
            #include "av1/encoder/picklpf.h"


            static void yv12_copy_plane(const YV12_BUFFER_CONFIG *src_bc,

            
                                        YV12_BUFFER_CONFIG *dst_bc, int plane) {

            
              switch (plane) {

            
                case 0: aom_yv12_copy_y(src_bc, dst_bc); break;

            
                case 1: aom_yv12_copy_u(src_bc, dst_bc); break;

            
                case 2: aom_yv12_copy_v(src_bc, dst_bc); break;

            
                default: assert(plane >= 0 && plane <= 2); break;

            
              }

            
            }


            int av1_get_max_filter_level(const AV1_COMP *cpi) {

            
              if (is_stat_consumption_stage_twopass(cpi)) {

            
                return cpi->ppi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4

            
                                                                  : MAX_LOOP_FILTER;

            
              } else {

            
                return MAX_LOOP_FILTER;

            
              }

            
            }


            static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd,

            
                                            AV1_COMP *const cpi, int filt_level,

            
                                            int partial_frame, int plane, int dir) {

            
              MultiThreadInfo *const mt_info = &cpi->mt_info;

            
              int num_workers = mt_info->num_mod_workers[MOD_LPF];

            
              AV1_COMMON *const cm = &cpi->common;

            
              int64_t filt_err;


              assert(plane >= 0 && plane <= 2);

            
              int filter_level[2] = { filt_level, filt_level };

            
              if (plane == 0 && dir == 0) filter_level[1] = cm->lf.filter_level[1];

            
              if (plane == 0 && dir == 1) filter_level[0] = cm->lf.filter_level[0];


              // set base filters for use of av1_get_filter_level when in DELTA_LF mode

            
              switch (plane) {

            
                case 0:

            
                  cm->lf.filter_level[0] = filter_level[0];

            
                  cm->lf.filter_level[1] = filter_level[1];

            
                  break;

            
                case 1: cm->lf.filter_level_u = filter_level[0]; break;

            
                case 2: cm->lf.filter_level_v = filter_level[0]; break;

            
              }


              // lpf_opt_level = 1 : Enables dual/quad loop-filtering.

            
              int lpf_opt_level = is_inter_tx_size_search_level_one(&cpi->sf.tx_sf);


              av1_loop_filter_frame_mt(&cm->cur_frame->buf, cm, &cpi->td.mb.e_mbd, plane,

            
                                       plane + 1, partial_frame, mt_info->workers,

            
                                       num_workers, &mt_info->lf_row_sync, lpf_opt_level);


              filt_err = aom_get_sse_plane(sd, &cm->cur_frame->buf, plane,

            
                                           cm->seq_params->use_highbitdepth);


              // Re-instate the unfiltered frame

            
              yv12_copy_plane(&cpi->last_frame_uf, &cm->cur_frame->buf, plane);


              return filt_err;

            
            }


            static int search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,

            
                                           int partial_frame,

            
                                           const int *last_frame_filter_level, int plane,

            
                                           int dir) {

            
              const AV1_COMMON *const cm = &cpi->common;

            
              const int min_filter_level = 0;

            
              const int max_filter_level = av1_get_max_filter_level(cpi);

            
              int filt_direction = 0;

            
              int64_t best_err;

            
              int filt_best;


              // Start the search at the previous frame filter level unless it is now out of

            
              // range.

            
              int lvl;

            
              switch (plane) {

            
                case 0:

            
                  switch (dir) {

            
                    case 2:

            
                      lvl = (last_frame_filter_level[0] + last_frame_filter_level[1] + 1) >>

            
                            1;

            
                      break;

            
                    case 0:

            
                    case 1: lvl = last_frame_filter_level[dir]; break;

            
                    default: assert(dir >= 0 && dir <= 2); return 0;

            
                  }

            
                  break;

            
                case 1: lvl = last_frame_filter_level[2]; break;

            
                case 2: lvl = last_frame_filter_level[3]; break;

            
                default: assert(plane >= 0 && plane <= 2); return 0;

            
              }

            
              int filt_mid = clamp(lvl, min_filter_level, max_filter_level);

            
              int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;

            
              // Sum squared error at each filter level

            
              int64_t ss_err[MAX_LOOP_FILTER + 1];


              const int use_coarse_search = cpi->sf.lpf_sf.use_coarse_filter_level_search;

            
              assert(use_coarse_search <= 1);

            
              static const int min_filter_step_lookup[2] = { 0, 2 };

            
              // min_filter_step_thesh determines the stopping criteria for the search.

            
              // The search is terminated when filter_step equals min_filter_step_thesh.

            
              const int min_filter_step_thesh = min_filter_step_lookup[use_coarse_search];


              // Set each entry to -1

            
              memset(ss_err, 0xFF, sizeof(ss_err));

            
              yv12_copy_plane(&cm->cur_frame->buf, &cpi->last_frame_uf, plane);

            
              best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame, plane, dir);

            
              filt_best = filt_mid;

            
              ss_err[filt_mid] = best_err;


              while (filter_step > min_filter_step_thesh) {

            
                const int filt_high = AOMMIN(filt_mid + filter_step, max_filter_level);

            
                const int filt_low = AOMMAX(filt_mid - filter_step, min_filter_level);


                // Bias against raising loop filter in favor of lowering it.

            
                int64_t bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;


                if ((is_stat_consumption_stage_twopass(cpi)) &&

            
                    (cpi->ppi->twopass.section_intra_rating < 20))

            
                  bias = (bias * cpi->ppi->twopass.section_intra_rating) / 20;


                // yx, bias less for large block size

            
                if (cm->features.tx_mode != ONLY_4X4) bias >>= 1;


                if (filt_direction <= 0 && filt_low != filt_mid) {

            
                  // Get Low filter error score

            
                  if (ss_err[filt_low] < 0) {

            
                    ss_err[filt_low] =

            
                        try_filter_frame(sd, cpi, filt_low, partial_frame, plane, dir);

            
                  }

            
                  // If value is close to the best so far then bias towards a lower loop

            
                  // filter value.

            
                  if (ss_err[filt_low] < (best_err + bias)) {

            
                    // Was it actually better than the previous best?

            
                    if (ss_err[filt_low] < best_err) {

            
                      best_err = ss_err[filt_low];

            
                    }

            
                    filt_best = filt_low;

            
                  }

            
                }


                // Now look at filt_high

            
                if (filt_direction >= 0 && filt_high != filt_mid) {

            
                  if (ss_err[filt_high] < 0) {

            
                    ss_err[filt_high] =

            
                        try_filter_frame(sd, cpi, filt_high, partial_frame, plane, dir);

            
                  }

            
                  // If value is significantly better than previous best, bias added against

            
                  // raising filter value

            
                  if (ss_err[filt_high] < (best_err - bias)) {

            
                    best_err = ss_err[filt_high];

            
                    filt_best = filt_high;

            
                  }

            
                }


                // Half the step distance if the best filter value was the same as last time

            
                if (filt_best == filt_mid) {

            
                  filter_step /= 2;

            
                  filt_direction = 0;

            
                } else {

            
                  filt_direction = (filt_best < filt_mid) ? -1 : 1;

            
                  filt_mid = filt_best;

            
                }

            
              }


              return filt_best;

            
            }


            void av1_pick_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,

            
                                       LPF_PICK_METHOD method) {

            
              AV1_COMMON *const cm = &cpi->common;

            
              const SequenceHeader *const seq_params = cm->seq_params;

            
              const int num_planes = av1_num_planes(cm);

            
              struct loopfilter *const lf = &cm->lf;

            
              int disable_filter_rt_screen = 0;

            
              (void)sd;


              lf->sharpness_level = 0;


              if (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN &&

            
                  cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ &&

            
                  cpi->sf.rt_sf.skip_lf_screen)

            
                disable_filter_rt_screen = av1_cyclic_refresh_disable_lf_cdef(cpi);


              if (disable_filter_rt_screen ||

            
                  cpi->oxcf.algo_cfg.loopfilter_control == LOOPFILTER_NONE ||

            
                  (cpi->oxcf.algo_cfg.loopfilter_control == LOOPFILTER_REFERENCE &&

            
                   cpi->ppi->rtc_ref.non_reference_frame)) {

            
                lf->filter_level[0] = 0;

            
                lf->filter_level[1] = 0;

            
                return;

            
              }


              if (method == LPF_PICK_MINIMAL_LPF) {

            
                lf->filter_level[0] = 0;

            
                lf->filter_level[1] = 0;

            
              } else if (method >= LPF_PICK_FROM_Q) {

            
                const int min_filter_level = 0;

            
                const int max_filter_level = av1_get_max_filter_level(cpi);

            
                const int q = av1_ac_quant_QTX(cm->quant_params.base_qindex, 0,

            
                                               seq_params->bit_depth);

            
                // based on tests result for rtc test set

            
                // 0.04590 boosted or 0.02295 non-booseted in 18-bit fixed point

            
                const int strength_boost_q_treshold = 0;

            
                int inter_frame_multiplier =

            
                    (q > strength_boost_q_treshold ||

            
                     (cpi->sf.rt_sf.use_nonrd_pick_mode &&

            
                      cpi->common.width * cpi->common.height > 352 * 288))

            
                        ? 12034

            
                        : 6017;

            
                // Increase strength on base TL0 for temporal layers, for low-resoln,

            
                // based on frame source_sad.

            
                if (cpi->svc.number_temporal_layers > 1 &&

            
                    cpi->svc.temporal_layer_id == 0 &&

            
                    cpi->common.width * cpi->common.height <= 352 * 288 &&

            
                    cpi->sf.rt_sf.use_nonrd_pick_mode) {

            
                  if (cpi->rc.frame_source_sad > 100000)

            
                    inter_frame_multiplier = inter_frame_multiplier << 1;

            
                  else if (cpi->rc.frame_source_sad > 50000)

            
                    inter_frame_multiplier = 3 * (inter_frame_multiplier >> 1);

            
                }

            
                // These values were determined by linear fitting the result of the

            
                // searched level for 8 bit depth:

            
                // Keyframes: filt_guess = q * 0.06699 - 1.60817

            
                // Other frames: filt_guess = q * inter_frame_multiplier + 2.48225

            
                //

            
                // And high bit depth separately:

            
                // filt_guess = q * 0.316206 + 3.87252

            
                int filt_guess;

            
                switch (seq_params->bit_depth) {

            
                  case AOM_BITS_8:

            
                    filt_guess =

            
                        (cm->current_frame.frame_type == KEY_FRAME)

            
                            ? ROUND_POWER_OF_TWO(q * 17563 - 421574, 18)

            
                            : ROUND_POWER_OF_TWO(q * inter_frame_multiplier + 650707, 18);

            
                    break;

            
                  case AOM_BITS_10:

            
                    filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20);

            
                    break;

            
                  case AOM_BITS_12:

            
                    filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22);

            
                    break;

            
                  default:

            
                    assert(0 &&

            
                           "bit_depth should be AOM_BITS_8, AOM_BITS_10 "

            
                           "or AOM_BITS_12");

            
                    return;

            
                }

            
                if (seq_params->bit_depth != AOM_BITS_8 &&

            
                    cm->current_frame.frame_type == KEY_FRAME)

            
                  filt_guess -= 4;

            
                // TODO(chengchen): retrain the model for Y, U, V filter levels

            
                lf->filter_level[0] = clamp(filt_guess, min_filter_level, max_filter_level);

            
                lf->filter_level[1] = clamp(filt_guess, min_filter_level, max_filter_level);

            
                lf->filter_level_u = clamp(filt_guess, min_filter_level, max_filter_level);

            
                lf->filter_level_v = clamp(filt_guess, min_filter_level, max_filter_level);

            
                if (cpi->oxcf.algo_cfg.loopfilter_control == LOOPFILTER_SELECTIVELY &&

            
                    !frame_is_intra_only(cm) && !cpi->rc.high_source_sad) {

            
                  if (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN) {

            
                    lf->filter_level[0] = 0;

            
                    lf->filter_level[1] = 0;

            
                  } else {

            
                    const int num4x4 = (cm->width >> 2) * (cm->height >> 2);

            
                    const int newmv_thresh = 7;

            
                    const int distance_since_key_thresh = 5;

            
                    if ((cpi->td.rd_counts.newmv_or_intra_blocks * 100 / num4x4) <

            
                            newmv_thresh &&

            
                        cpi->rc.frames_since_key > distance_since_key_thresh) {

            
                      lf->filter_level[0] = 0;

            
                      lf->filter_level[1] = 0;

            
                    }

            
                  }

            
                }

            
              } else {

            
                int last_frame_filter_level[4] = { 0 };

            
                if (!frame_is_intra_only(cm)) {

            
                  last_frame_filter_level[0] = cpi->ppi->filter_level[0];

            
                  last_frame_filter_level[1] = cpi->ppi->filter_level[1];

            
                  last_frame_filter_level[2] = cpi->ppi->filter_level_u;

            
                  last_frame_filter_level[3] = cpi->ppi->filter_level_v;

            
                }

            
                // The frame buffer last_frame_uf is used to store the non-loop filtered

            
                // reconstructed frame in search_filter_level().

            
                if (aom_realloc_frame_buffer(

            
                        &cpi->last_frame_uf, cm->width, cm->height,

            
                        seq_params->subsampling_x, seq_params->subsampling_y,

            
                        seq_params->use_highbitdepth, cpi->oxcf.border_in_pixels,

            
                        cm->features.byte_alignment, NULL, NULL, NULL, 0, 0))

            
                  aom_internal_error(cm->error, AOM_CODEC_MEM_ERROR,

            
                                     "Failed to allocate last frame buffer");


                lf->filter_level[0] = lf->filter_level[1] =

            
                    search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,

            
                                        last_frame_filter_level, 0, 2);

            
                if (method != LPF_PICK_FROM_FULL_IMAGE_NON_DUAL) {

            
                  lf->filter_level[0] =

            
                      search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,

            
                                          last_frame_filter_level, 0, 0);

            
                  lf->filter_level[1] =

            
                      search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,

            
                                          last_frame_filter_level, 0, 1);

            
                }


                if (num_planes > 1) {

            
                  lf->filter_level_u =

            
                      search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,

            
                                          last_frame_filter_level, 1, 0);

            
                  lf->filter_level_v =

            
                      search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,

            
                                          last_frame_filter_level, 2, 0);

            
                }

            
              }

            
            }
	/*
	* 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 <assert.h>
	#include <limits.h>

	#include "config/aom_scale_rtcd.h"

	#include "aom_dsp/aom_dsp_common.h"
	#include "aom_dsp/psnr.h"
	#include "aom_mem/aom_mem.h"
	#include "aom_ports/mem.h"

	#include "av1/common/av1_common_int.h"
	#include "av1/common/av1_loopfilter.h"
	#include "av1/common/quant_common.h"

	#include "av1/encoder/av1_quantize.h"
	#include "av1/encoder/encoder.h"
	#include "av1/encoder/picklpf.h"

	static void yv12_copy_plane(const YV12_BUFFER_CONFIG *src_bc,
	YV12_BUFFER_CONFIG *dst_bc, int plane) {
	switch (plane) {
	case 0: aom_yv12_copy_y(src_bc, dst_bc); break;
	case 1: aom_yv12_copy_u(src_bc, dst_bc); break;
	case 2: aom_yv12_copy_v(src_bc, dst_bc); break;
	default: assert(plane >= 0 && plane <= 2); break;
	}
	}

	int av1_get_max_filter_level(const AV1_COMP *cpi) {
	if (is_stat_consumption_stage_twopass(cpi)) {
	return cpi->ppi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
	: MAX_LOOP_FILTER;
	} else {
	return MAX_LOOP_FILTER;
	}
	}

	static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd,
	AV1_COMP *const cpi, int filt_level,
	int partial_frame, int plane, int dir) {
	MultiThreadInfo *const mt_info = &cpi->mt_info;
	int num_workers = mt_info->num_mod_workers[MOD_LPF];
	AV1_COMMON *const cm = &cpi->common;
	int64_t filt_err;

	assert(plane >= 0 && plane <= 2);
	int filter_level[2] = { filt_level, filt_level };
	if (plane == 0 && dir == 0) filter_level[1] = cm->lf.filter_level[1];
	if (plane == 0 && dir == 1) filter_level[0] = cm->lf.filter_level[0];

	// set base filters for use of av1_get_filter_level when in DELTA_LF mode
	switch (plane) {
	case 0:
	cm->lf.filter_level[0] = filter_level[0];
	cm->lf.filter_level[1] = filter_level[1];
	break;
	case 1: cm->lf.filter_level_u = filter_level[0]; break;
	case 2: cm->lf.filter_level_v = filter_level[0]; break;
	}

	// lpf_opt_level = 1 : Enables dual/quad loop-filtering.
	int lpf_opt_level = is_inter_tx_size_search_level_one(&cpi->sf.tx_sf);

	av1_loop_filter_frame_mt(&cm->cur_frame->buf, cm, &cpi->td.mb.e_mbd, plane,
	plane + 1, partial_frame, mt_info->workers,
	num_workers, &mt_info->lf_row_sync, lpf_opt_level);

	filt_err = aom_get_sse_plane(sd, &cm->cur_frame->buf, plane,
	cm->seq_params->use_highbitdepth);

	// Re-instate the unfiltered frame
	yv12_copy_plane(&cpi->last_frame_uf, &cm->cur_frame->buf, plane);

	return filt_err;
	}

	static int search_filter_level(const YV12_BUFFER_CONFIG sd, AV1_COMP cpi,
	int partial_frame,
	const int *last_frame_filter_level, int plane,
	int dir) {
	const AV1_COMMON *const cm = &cpi->common;
	const int min_filter_level = 0;
	const int max_filter_level = av1_get_max_filter_level(cpi);
	int filt_direction = 0;
	int64_t best_err;
	int filt_best;

	// Start the search at the previous frame filter level unless it is now out of
	// range.
	int lvl;
	switch (plane) {
	case 0:
	switch (dir) {
	case 2:
	lvl = (last_frame_filter_level[0] + last_frame_filter_level[1] + 1) >>
	1;
	break;
	case 0:
	case 1: lvl = last_frame_filter_level[dir]; break;
	default: assert(dir >= 0 && dir <= 2); return 0;
	}
	break;
	case 1: lvl = last_frame_filter_level[2]; break;
	case 2: lvl = last_frame_filter_level[3]; break;
	default: assert(plane >= 0 && plane <= 2); return 0;
	}
	int filt_mid = clamp(lvl, min_filter_level, max_filter_level);
	int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
	// Sum squared error at each filter level
	int64_t ss_err[MAX_LOOP_FILTER + 1];

	const int use_coarse_search = cpi->sf.lpf_sf.use_coarse_filter_level_search;
	assert(use_coarse_search <= 1);
	static const int min_filter_step_lookup[2] = { 0, 2 };
	// min_filter_step_thesh determines the stopping criteria for the search.
	// The search is terminated when filter_step equals min_filter_step_thesh.
	const int min_filter_step_thesh = min_filter_step_lookup[use_coarse_search];

	// Set each entry to -1
	memset(ss_err, 0xFF, sizeof(ss_err));
	yv12_copy_plane(&cm->cur_frame->buf, &cpi->last_frame_uf, plane);
	best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame, plane, dir);
	filt_best = filt_mid;
	ss_err[filt_mid] = best_err;

	while (filter_step > min_filter_step_thesh) {
	const int filt_high = AOMMIN(filt_mid + filter_step, max_filter_level);
	const int filt_low = AOMMAX(filt_mid - filter_step, min_filter_level);

	// Bias against raising loop filter in favor of lowering it.
	int64_t bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;

	if ((is_stat_consumption_stage_twopass(cpi)) &&
	(cpi->ppi->twopass.section_intra_rating < 20))
	bias = (bias * cpi->ppi->twopass.section_intra_rating) / 20;

	// yx, bias less for large block size
	if (cm->features.tx_mode != ONLY_4X4) bias >>= 1;

	if (filt_direction <= 0 && filt_low != filt_mid) {
	// Get Low filter error score
	if (ss_err[filt_low] < 0) {
	ss_err[filt_low] =
	try_filter_frame(sd, cpi, filt_low, partial_frame, plane, dir);
	}
	// If value is close to the best so far then bias towards a lower loop
	// filter value.
	if (ss_err[filt_low] < (best_err + bias)) {
	// Was it actually better than the previous best?
	if (ss_err[filt_low] < best_err) {
	best_err = ss_err[filt_low];
	}
	filt_best = filt_low;
	}
	}

	// Now look at filt_high
	if (filt_direction >= 0 && filt_high != filt_mid) {
	if (ss_err[filt_high] < 0) {
	ss_err[filt_high] =
	try_filter_frame(sd, cpi, filt_high, partial_frame, plane, dir);
	}
	// If value is significantly better than previous best, bias added against
	// raising filter value
	if (ss_err[filt_high] < (best_err - bias)) {
	best_err = ss_err[filt_high];
	filt_best = filt_high;
	}
	}

	// Half the step distance if the best filter value was the same as last time
	if (filt_best == filt_mid) {
	filter_step /= 2;
	filt_direction = 0;
	} else {
	filt_direction = (filt_best < filt_mid) ? -1 : 1;
	filt_mid = filt_best;
	}
	}

	return filt_best;
	}

	void av1_pick_filter_level(const YV12_BUFFER_CONFIG sd, AV1_COMP cpi,
	LPF_PICK_METHOD method) {
	AV1_COMMON *const cm = &cpi->common;
	const SequenceHeader *const seq_params = cm->seq_params;
	const int num_planes = av1_num_planes(cm);
	struct loopfilter *const lf = &cm->lf;
	int disable_filter_rt_screen = 0;
	(void)sd;

	lf->sharpness_level = 0;

	if (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN &&
	cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ &&
	cpi->sf.rt_sf.skip_lf_screen)
	disable_filter_rt_screen = av1_cyclic_refresh_disable_lf_cdef(cpi);

	if (disable_filter_rt_screen \|\|
	cpi->oxcf.algo_cfg.loopfilter_control == LOOPFILTER_NONE \|\|
	(cpi->oxcf.algo_cfg.loopfilter_control == LOOPFILTER_REFERENCE &&
	cpi->ppi->rtc_ref.non_reference_frame)) {
	lf->filter_level[0] = 0;
	lf->filter_level[1] = 0;
	return;
	}

	if (method == LPF_PICK_MINIMAL_LPF) {
	lf->filter_level[0] = 0;
	lf->filter_level[1] = 0;
	} else if (method >= LPF_PICK_FROM_Q) {
	const int min_filter_level = 0;
	const int max_filter_level = av1_get_max_filter_level(cpi);
	const int q = av1_ac_quant_QTX(cm->quant_params.base_qindex, 0,
	seq_params->bit_depth);
	// based on tests result for rtc test set
	// 0.04590 boosted or 0.02295 non-booseted in 18-bit fixed point
	const int strength_boost_q_treshold = 0;
	int inter_frame_multiplier =
	(q > strength_boost_q_treshold \|\|
	(cpi->sf.rt_sf.use_nonrd_pick_mode &&
	cpi->common.width * cpi->common.height > 352 * 288))
	? 12034
	: 6017;
	// Increase strength on base TL0 for temporal layers, for low-resoln,
	// based on frame source_sad.
	if (cpi->svc.number_temporal_layers > 1 &&
	cpi->svc.temporal_layer_id == 0 &&
	cpi->common.width * cpi->common.height <= 352 * 288 &&
	cpi->sf.rt_sf.use_nonrd_pick_mode) {
	if (cpi->rc.frame_source_sad > 100000)
	inter_frame_multiplier = inter_frame_multiplier << 1;
	else if (cpi->rc.frame_source_sad > 50000)
	inter_frame_multiplier = 3 * (inter_frame_multiplier >> 1);
	}
	// These values were determined by linear fitting the result of the
	// searched level for 8 bit depth:
	// Keyframes: filt_guess = q * 0.06699 - 1.60817
	// Other frames: filt_guess = q * inter_frame_multiplier + 2.48225
	//
	// And high bit depth separately:
	// filt_guess = q * 0.316206 + 3.87252
	int filt_guess;
	switch (seq_params->bit_depth) {
	case AOM_BITS_8:
	filt_guess =
	(cm->current_frame.frame_type == KEY_FRAME)
	? ROUND_POWER_OF_TWO(q * 17563 - 421574, 18)
	: ROUND_POWER_OF_TWO(q * inter_frame_multiplier + 650707, 18);
	break;
	case AOM_BITS_10:
	filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20);
	break;
	case AOM_BITS_12:
	filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22);
	break;
	default:
	assert(0 &&
	"bit_depth should be AOM_BITS_8, AOM_BITS_10 "
	"or AOM_BITS_12");
	return;
	}
	if (seq_params->bit_depth != AOM_BITS_8 &&
	cm->current_frame.frame_type == KEY_FRAME)
	filt_guess -= 4;
	// TODO(chengchen): retrain the model for Y, U, V filter levels
	lf->filter_level[0] = clamp(filt_guess, min_filter_level, max_filter_level);
	lf->filter_level[1] = clamp(filt_guess, min_filter_level, max_filter_level);
	lf->filter_level_u = clamp(filt_guess, min_filter_level, max_filter_level);
	lf->filter_level_v = clamp(filt_guess, min_filter_level, max_filter_level);
	if (cpi->oxcf.algo_cfg.loopfilter_control == LOOPFILTER_SELECTIVELY &&
	!frame_is_intra_only(cm) && !cpi->rc.high_source_sad) {
	if (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN) {
	lf->filter_level[0] = 0;
	lf->filter_level[1] = 0;
	} else {
	const int num4x4 = (cm->width >> 2) * (cm->height >> 2);
	const int newmv_thresh = 7;
	const int distance_since_key_thresh = 5;
	if ((cpi->td.rd_counts.newmv_or_intra_blocks * 100 / num4x4) <
	newmv_thresh &&
	cpi->rc.frames_since_key > distance_since_key_thresh) {
	lf->filter_level[0] = 0;
	lf->filter_level[1] = 0;
	}
	}
	}
	} else {
	int last_frame_filter_level[4] = { 0 };
	if (!frame_is_intra_only(cm)) {
	last_frame_filter_level[0] = cpi->ppi->filter_level[0];
	last_frame_filter_level[1] = cpi->ppi->filter_level[1];
	last_frame_filter_level[2] = cpi->ppi->filter_level_u;
	last_frame_filter_level[3] = cpi->ppi->filter_level_v;
	}
	// The frame buffer last_frame_uf is used to store the non-loop filtered
	// reconstructed frame in search_filter_level().
	if (aom_realloc_frame_buffer(
	&cpi->last_frame_uf, cm->width, cm->height,
	seq_params->subsampling_x, seq_params->subsampling_y,
	seq_params->use_highbitdepth, cpi->oxcf.border_in_pixels,
	cm->features.byte_alignment, NULL, NULL, NULL, 0, 0))
	aom_internal_error(cm->error, AOM_CODEC_MEM_ERROR,
	"Failed to allocate last frame buffer");

	lf->filter_level[0] = lf->filter_level[1] =
	search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
	last_frame_filter_level, 0, 2);
	if (method != LPF_PICK_FROM_FULL_IMAGE_NON_DUAL) {
	lf->filter_level[0] =
	search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
	last_frame_filter_level, 0, 0);
	lf->filter_level[1] =
	search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
	last_frame_filter_level, 0, 1);
	}

	if (num_planes > 1) {
	lf->filter_level_u =
	search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
	last_frame_filter_level, 1, 0);
	lf->filter_level_v =
	search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
	last_frame_filter_level, 2, 0);
	}
	}
	}