Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 801 insertions, 0 deletions

diff --git a/third_party/aom/av1/encoder/interp_search.c b/third_party/aom/av1/encoder/interp_search.c
new file mode 100644
index 0000000000..27235303c0
--- /dev/null
+++ b/third_party/aom/av1/encoder/interp_search.c
@@ -0,0 +1,801 @@
+/*
+ * Copyright (c) 2020, 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 "av1/common/pred_common.h"
+#include "av1/encoder/interp_search.h"
+#include "av1/encoder/model_rd.h"
+#include "av1/encoder/rdopt_utils.h"
+#include "av1/encoder/reconinter_enc.h"
+
+// return mv_diff
+static INLINE int is_interp_filter_good_match(
+    const INTERPOLATION_FILTER_STATS *st, MB_MODE_INFO *const mi,
+    int skip_level) {
+  const int is_comp = has_second_ref(mi);
+  int i;
+
+  for (i = 0; i < 1 + is_comp; ++i) {
+    if (st->ref_frames[i] != mi->ref_frame[i]) return INT_MAX;
+  }
+
+  if (skip_level == 1 && is_comp) {
+    if (st->comp_type != mi->interinter_comp.type) return INT_MAX;
+    if (st->compound_idx != mi->compound_idx) return INT_MAX;
+  }
+
+  int mv_diff = 0;
+  for (i = 0; i < 1 + is_comp; ++i) {
+    mv_diff += abs(st->mv[i].as_mv.row - mi->mv[i].as_mv.row) +
+               abs(st->mv[i].as_mv.col - mi->mv[i].as_mv.col);
+  }
+  return mv_diff;
+}
+
+static INLINE int save_interp_filter_search_stat(
+    MB_MODE_INFO *const mbmi, int64_t rd, unsigned int pred_sse,
+    INTERPOLATION_FILTER_STATS *interp_filter_stats,
+    int interp_filter_stats_idx) {
+  if (interp_filter_stats_idx < MAX_INTERP_FILTER_STATS) {
+    INTERPOLATION_FILTER_STATS stat = { mbmi->interp_filters,
+                                        { mbmi->mv[0], mbmi->mv[1] },
+                                        { mbmi->ref_frame[0],
+                                          mbmi->ref_frame[1] },
+                                        mbmi->interinter_comp.type,
+                                        mbmi->compound_idx,
+                                        rd,
+                                        pred_sse };
+    interp_filter_stats[interp_filter_stats_idx] = stat;
+    interp_filter_stats_idx++;
+  }
+  return interp_filter_stats_idx;
+}
+
+static INLINE int find_interp_filter_in_stats(
+    MB_MODE_INFO *const mbmi, INTERPOLATION_FILTER_STATS *interp_filter_stats,
+    int interp_filter_stats_idx, int skip_level) {
+  // [skip_levels][single or comp]
+  const int thr[2][2] = { { 0, 0 }, { 3, 7 } };
+  const int is_comp = has_second_ref(mbmi);
+
+  // Find good enough match.
+  // TODO(yunqing): Separate single-ref mode and comp mode stats for fast
+  // search.
+  int best = INT_MAX;
+  int match = -1;
+  for (int j = 0; j < interp_filter_stats_idx; ++j) {
+    const INTERPOLATION_FILTER_STATS *st = &interp_filter_stats[j];
+    const int mv_diff = is_interp_filter_good_match(st, mbmi, skip_level);
+    // Exact match is found.
+    if (mv_diff == 0) {
+      match = j;
+      break;
+    } else if (mv_diff < best && mv_diff <= thr[skip_level - 1][is_comp]) {
+      best = mv_diff;
+      match = j;
+    }
+  }
+
+  if (match != -1) {
+    mbmi->interp_filters = interp_filter_stats[match].filters;
+    return match;
+  }
+  return -1;  // no match result found
+}
+
+int av1_find_interp_filter_match(
+    MB_MODE_INFO *const mbmi, const AV1_COMP *const cpi,
+    const InterpFilter assign_filter, const int need_search,
+    INTERPOLATION_FILTER_STATS *interp_filter_stats,
+    int interp_filter_stats_idx) {
+  int match_found_idx = -1;
+  if (cpi->sf.interp_sf.use_interp_filter && need_search)
+    match_found_idx = find_interp_filter_in_stats(
+        mbmi, interp_filter_stats, interp_filter_stats_idx,
+        cpi->sf.interp_sf.use_interp_filter);
+
+  if (!need_search || match_found_idx == -1)
+    set_default_interp_filters(mbmi, assign_filter);
+  return match_found_idx;
+}
+
+static INLINE int get_switchable_rate(MACROBLOCK *const x,
+                                      const int_interpfilters filters,
+                                      const int ctx[2], int dual_filter) {
+  const InterpFilter filter0 = filters.as_filters.y_filter;
+  int inter_filter_cost =
+      x->mode_costs.switchable_interp_costs[ctx[0]][filter0];
+  if (dual_filter) {
+    const InterpFilter filter1 = filters.as_filters.x_filter;
+    inter_filter_cost += x->mode_costs.switchable_interp_costs[ctx[1]][filter1];
+  }
+  return SWITCHABLE_INTERP_RATE_FACTOR * inter_filter_cost;
+}
+
+// Build inter predictor and calculate model rd
+// for a given plane.
+static INLINE void interp_model_rd_eval(
+    MACROBLOCK *const x, const AV1_COMP *const cpi, BLOCK_SIZE bsize,
+    const BUFFER_SET *const orig_dst, int plane_from, int plane_to,
+    RD_STATS *rd_stats, int is_skip_build_pred) {
+  const AV1_COMMON *cm = &cpi->common;
+  MACROBLOCKD *const xd = &x->e_mbd;
+  RD_STATS tmp_rd_stats;
+  av1_init_rd_stats(&tmp_rd_stats);
+
+  // Skip inter predictor if the predictor is already available.
+  if (!is_skip_build_pred) {
+    const int mi_row = xd->mi_row;
+    const int mi_col = xd->mi_col;
+    av1_enc_build_inter_predictor(cm, xd, mi_row, mi_col, orig_dst, bsize,
+                                  plane_from, plane_to);
+  }
+
+  model_rd_sb_fn[cpi->sf.rt_sf.use_simple_rd_model
+                     ? MODELRD_LEGACY
+                     : MODELRD_TYPE_INTERP_FILTER](
+      cpi, bsize, x, xd, plane_from, plane_to, &tmp_rd_stats.rate,
+      &tmp_rd_stats.dist, &tmp_rd_stats.skip_txfm, &tmp_rd_stats.sse, NULL,
+      NULL, NULL);
+
+  av1_merge_rd_stats(rd_stats, &tmp_rd_stats);
+}
+
+// calculate the rdcost of given interpolation_filter
+static INLINE int64_t interpolation_filter_rd(
+    MACROBLOCK *const x, const AV1_COMP *const cpi,
+    const TileDataEnc *tile_data, BLOCK_SIZE bsize,
+    const BUFFER_SET *const orig_dst, int64_t *const rd,
+    RD_STATS *rd_stats_luma, RD_STATS *rd_stats, int *const switchable_rate,
+    const BUFFER_SET *dst_bufs[2], int filter_idx, const int switchable_ctx[2],
+    const int skip_pred) {
+  const AV1_COMMON *cm = &cpi->common;
+  const InterpSearchFlags *interp_search_flags = &cpi->interp_search_flags;
+  const int num_planes = av1_num_planes(cm);
+  MACROBLOCKD *const xd = &x->e_mbd;
+  MB_MODE_INFO *const mbmi = xd->mi[0];
+  RD_STATS this_rd_stats_luma, this_rd_stats;
+
+  // Initialize rd_stats structures to default values.
+  av1_init_rd_stats(&this_rd_stats_luma);
+  this_rd_stats = *rd_stats_luma;
+  const int_interpfilters last_best = mbmi->interp_filters;
+  mbmi->interp_filters = filter_sets[filter_idx];
+  const int tmp_rs =
+      get_switchable_rate(x, mbmi->interp_filters, switchable_ctx,
+                          cm->seq_params->enable_dual_filter);
+
+  int64_t min_rd = RDCOST(x->rdmult, tmp_rs, 0);
+  if (min_rd > *rd) {
+    mbmi->interp_filters = last_best;
+    return 0;
+  }
+
+  (void)tile_data;
+
+  assert(skip_pred != 2);
+  assert((rd_stats_luma->rate >= 0) && (rd_stats->rate >= 0));
+  assert((rd_stats_luma->dist >= 0) && (rd_stats->dist >= 0));
+  assert((rd_stats_luma->sse >= 0) && (rd_stats->sse >= 0));
+  assert((rd_stats_luma->skip_txfm == 0) || (rd_stats_luma->skip_txfm == 1));
+  assert((rd_stats->skip_txfm == 0) || (rd_stats->skip_txfm == 1));
+  assert((skip_pred >= 0) &&
+         (skip_pred <= interp_search_flags->default_interp_skip_flags));
+
+  // When skip_txfm pred is equal to default_interp_skip_flags,
+  // skip both luma and chroma MC.
+  // For mono-chrome images:
+  // num_planes = 1 and cpi->default_interp_skip_flags = 1,
+  // skip_pred = 1: skip both luma and chroma
+  // skip_pred = 0: Evaluate luma and as num_planes=1,
+  // skip chroma evaluation
+  int tmp_skip_pred =
+      (skip_pred == interp_search_flags->default_interp_skip_flags)
+          ? INTERP_SKIP_LUMA_SKIP_CHROMA
+          : skip_pred;
+
+  switch (tmp_skip_pred) {
+    case INTERP_EVAL_LUMA_EVAL_CHROMA:
+      // skip_pred = 0: Evaluate both luma and chroma.
+      // Luma MC
+      interp_model_rd_eval(x, cpi, bsize, orig_dst, AOM_PLANE_Y, AOM_PLANE_Y,
+                           &this_rd_stats_luma, 0);
+      this_rd_stats = this_rd_stats_luma;
+#if CONFIG_COLLECT_RD_STATS == 3
+      RD_STATS rd_stats_y;
+      av1_pick_recursive_tx_size_type_yrd(cpi, x, &rd_stats_y, bsize,
+                                          INT64_MAX);
+      PrintPredictionUnitStats(cpi, tile_data, x, &rd_stats_y, bsize);
+#endif  // CONFIG_COLLECT_RD_STATS == 3
+      AOM_FALLTHROUGH_INTENDED;
+    case INTERP_SKIP_LUMA_EVAL_CHROMA:
+      // skip_pred = 1: skip luma evaluation (retain previous best luma stats)
+      // and do chroma evaluation.
+      for (int plane = 1; plane < num_planes; ++plane) {
+        int64_t tmp_rd =
+            RDCOST(x->rdmult, tmp_rs + this_rd_stats.rate, this_rd_stats.dist);
+        if (tmp_rd >= *rd) {
+          mbmi->interp_filters = last_best;
+          return 0;
+        }
+        interp_model_rd_eval(x, cpi, bsize, orig_dst, plane, plane,
+                             &this_rd_stats, 0);
+      }
+      break;
+    case INTERP_SKIP_LUMA_SKIP_CHROMA:
+      // both luma and chroma evaluation is skipped
+      this_rd_stats = *rd_stats;
+      break;
+    case INTERP_EVAL_INVALID:
+    default: assert(0); return 0;
+  }
+  int64_t tmp_rd =
+      RDCOST(x->rdmult, tmp_rs + this_rd_stats.rate, this_rd_stats.dist);
+
+  if (tmp_rd < *rd) {
+    *rd = tmp_rd;
+    *switchable_rate = tmp_rs;
+    if (skip_pred != interp_search_flags->default_interp_skip_flags) {
+      if (skip_pred == INTERP_EVAL_LUMA_EVAL_CHROMA) {
+        // Overwrite the data as current filter is the best one
+        *rd_stats_luma = this_rd_stats_luma;
+        *rd_stats = this_rd_stats;
+        // As luma MC data is computed, no need to recompute after the search
+        x->recalc_luma_mc_data = 0;
+      } else if (skip_pred == INTERP_SKIP_LUMA_EVAL_CHROMA) {
+        // As luma MC data is not computed, update of luma data can be skipped
+        *rd_stats = this_rd_stats;
+        // As luma MC data is not recomputed and current filter is the best,
+        // indicate the possibility of recomputing MC data
+        // If current buffer contains valid MC data, toggle to indicate that
+        // luma MC data needs to be recomputed
+        x->recalc_luma_mc_data ^= 1;
+      }
+      swap_dst_buf(xd, dst_bufs, num_planes);
+    }
+    return 1;
+  }
+  mbmi->interp_filters = last_best;
+  return 0;
+}
+
+static INLINE INTERP_PRED_TYPE is_pred_filter_search_allowed(
+    const AV1_COMP *const cpi, MACROBLOCKD *xd, BLOCK_SIZE bsize,
+    int_interpfilters *af, int_interpfilters *lf) {
+  const AV1_COMMON *cm = &cpi->common;
+  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
+  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
+  const int bsl = mi_size_wide_log2[bsize];
+  int is_horiz_eq = 0, is_vert_eq = 0;
+
+  if (above_mbmi && is_inter_block(above_mbmi))
+    *af = above_mbmi->interp_filters;
+
+  if (left_mbmi && is_inter_block(left_mbmi)) *lf = left_mbmi->interp_filters;
+
+  if (af->as_filters.x_filter != INTERP_INVALID)
+    is_horiz_eq = af->as_filters.x_filter == lf->as_filters.x_filter;
+  if (af->as_filters.y_filter != INTERP_INVALID)
+    is_vert_eq = af->as_filters.y_filter == lf->as_filters.y_filter;
+
+  INTERP_PRED_TYPE pred_filter_type = (is_vert_eq << 1) + is_horiz_eq;
+  const int mi_row = xd->mi_row;
+  const int mi_col = xd->mi_col;
+  int pred_filter_enable =
+      cpi->sf.interp_sf.cb_pred_filter_search
+          ? (((mi_row + mi_col) >> bsl) +
+             get_chessboard_index(cm->current_frame.frame_number)) &
+                0x1
+          : 0;
+  pred_filter_enable &= is_horiz_eq || is_vert_eq;
+  // pred_filter_search = 0: pred_filter is disabled
+  // pred_filter_search = 1: pred_filter is enabled and only horz pred matching
+  // pred_filter_search = 2: pred_filter is enabled and only vert pred matching
+  // pred_filter_search = 3: pred_filter is enabled and
+  //                         both vert, horz pred matching
+  return pred_filter_enable * pred_filter_type;
+}
+
+static DUAL_FILTER_TYPE find_best_interp_rd_facade(
+    MACROBLOCK *const x, const AV1_COMP *const cpi,
+    const TileDataEnc *tile_data, BLOCK_SIZE bsize,
+    const BUFFER_SET *const orig_dst, int64_t *const rd, RD_STATS *rd_stats_y,
+    RD_STATS *rd_stats, int *const switchable_rate,
+    const BUFFER_SET *dst_bufs[2], const int switchable_ctx[2],
+    const int skip_pred, uint16_t allow_interp_mask, int is_w4_or_h4) {
+  int tmp_skip_pred = skip_pred;
+  DUAL_FILTER_TYPE best_filt_type = REG_REG;
+
+  // If no filter are set to be evaluated, return from function
+  if (allow_interp_mask == 0x0) return best_filt_type;
+  // For block width or height is 4, skip the pred evaluation of SHARP_SHARP
+  tmp_skip_pred = is_w4_or_h4
+                      ? cpi->interp_search_flags.default_interp_skip_flags
+                      : skip_pred;
+
+  // Loop over the all filter types and evaluate for only allowed filter types
+  for (int filt_type = SHARP_SHARP; filt_type >= REG_REG; --filt_type) {
+    const int is_filter_allowed =
+        get_interp_filter_allowed_mask(allow_interp_mask, filt_type);
+    if (is_filter_allowed)
+      if (interpolation_filter_rd(x, cpi, tile_data, bsize, orig_dst, rd,
+                                  rd_stats_y, rd_stats, switchable_rate,
+                                  dst_bufs, filt_type, switchable_ctx,
+                                  tmp_skip_pred))
+        best_filt_type = filt_type;
+    tmp_skip_pred = skip_pred;
+  }
+  return best_filt_type;
+}
+
+static INLINE void pred_dual_interp_filter_rd(
+    MACROBLOCK *const x, const AV1_COMP *const cpi,
+    const TileDataEnc *tile_data, BLOCK_SIZE bsize,
+    const BUFFER_SET *const orig_dst, int64_t *const rd, RD_STATS *rd_stats_y,
+    RD_STATS *rd_stats, int *const switchable_rate,
+    const BUFFER_SET *dst_bufs[2], const int switchable_ctx[2],
+    const int skip_pred, INTERP_PRED_TYPE pred_filt_type, int_interpfilters *af,
+    int_interpfilters *lf) {
+  (void)lf;
+  assert(pred_filt_type > INTERP_HORZ_NEQ_VERT_NEQ);
+  assert(pred_filt_type < INTERP_PRED_TYPE_ALL);
+  uint16_t allowed_interp_mask = 0;
+
+  if (pred_filt_type == INTERP_HORZ_EQ_VERT_NEQ) {
+    // pred_filter_search = 1: Only horizontal filter is matching
+    allowed_interp_mask =
+        av1_interp_dual_filt_mask[pred_filt_type - 1][af->as_filters.x_filter];
+  } else if (pred_filt_type == INTERP_HORZ_NEQ_VERT_EQ) {
+    // pred_filter_search = 2: Only vertical filter is matching
+    allowed_interp_mask =
+        av1_interp_dual_filt_mask[pred_filt_type - 1][af->as_filters.y_filter];
+  } else {
+    // pred_filter_search = 3: Both horizontal and vertical filter are matching
+    int filt_type =
+        af->as_filters.x_filter + af->as_filters.y_filter * SWITCHABLE_FILTERS;
+    set_interp_filter_allowed_mask(&allowed_interp_mask, filt_type);
+  }
+  // REG_REG is already been evaluated in the beginning
+  reset_interp_filter_allowed_mask(&allowed_interp_mask, REG_REG);
+  find_best_interp_rd_facade(x, cpi, tile_data, bsize, orig_dst, rd, rd_stats_y,
+                             rd_stats, switchable_rate, dst_bufs,
+                             switchable_ctx, skip_pred, allowed_interp_mask, 0);
+}
+// Evaluate dual filter type
+// a) Using above, left block interp filter
+// b) Find the best horizontal filter and
+//    then evaluate corresponding vertical filters.
+static INLINE void fast_dual_interp_filter_rd(
+    MACROBLOCK *const x, const AV1_COMP *const cpi,
+    const TileDataEnc *tile_data, BLOCK_SIZE bsize,
+    const BUFFER_SET *const orig_dst, int64_t *const rd, RD_STATS *rd_stats_y,
+    RD_STATS *rd_stats, int *const switchable_rate,
+    const BUFFER_SET *dst_bufs[2], const int switchable_ctx[2],
+    const int skip_hor, const int skip_ver) {
+  const InterpSearchFlags *interp_search_flags = &cpi->interp_search_flags;
+  MACROBLOCKD *const xd = &x->e_mbd;
+  MB_MODE_INFO *const mbmi = xd->mi[0];
+  INTERP_PRED_TYPE pred_filter_type = INTERP_HORZ_NEQ_VERT_NEQ;
+  int_interpfilters af = av1_broadcast_interp_filter(INTERP_INVALID);
+  int_interpfilters lf = af;
+
+  if (!have_newmv_in_inter_mode(mbmi->mode)) {
+    pred_filter_type = is_pred_filter_search_allowed(cpi, xd, bsize, &af, &lf);
+  }
+
+  if (pred_filter_type) {
+    pred_dual_interp_filter_rd(x, cpi, tile_data, bsize, orig_dst, rd,
+                               rd_stats_y, rd_stats, switchable_rate, dst_bufs,
+                               switchable_ctx, (skip_hor & skip_ver),
+                               pred_filter_type, &af, &lf);
+  } else {
+    const int bw = block_size_wide[bsize];
+    const int bh = block_size_high[bsize];
+    int best_dual_mode = 0;
+    int skip_pred =
+        bw <= 4 ? interp_search_flags->default_interp_skip_flags : skip_hor;
+    // TODO(any): Make use of find_best_interp_rd_facade()
+    // if speed impact is negligible
+    for (int i = (SWITCHABLE_FILTERS - 1); i >= 1; --i) {
+      if (interpolation_filter_rd(x, cpi, tile_data, bsize, orig_dst, rd,
+                                  rd_stats_y, rd_stats, switchable_rate,
+                                  dst_bufs, i, switchable_ctx, skip_pred)) {
+        best_dual_mode = i;
+      }
+      skip_pred = skip_hor;
+    }
+    // From best of horizontal EIGHTTAP_REGULAR modes, check vertical modes
+    skip_pred =
+        bh <= 4 ? interp_search_flags->default_interp_skip_flags : skip_ver;
+    for (int i = (best_dual_mode + (SWITCHABLE_FILTERS * 2));
+         i >= (best_dual_mode + SWITCHABLE_FILTERS); i -= SWITCHABLE_FILTERS) {
+      interpolation_filter_rd(x, cpi, tile_data, bsize, orig_dst, rd,
+                              rd_stats_y, rd_stats, switchable_rate, dst_bufs,
+                              i, switchable_ctx, skip_pred);
+      skip_pred = skip_ver;
+    }
+  }
+}
+
+// Find the best interp filter if dual_interp_filter = 0
+static INLINE void find_best_non_dual_interp_filter(
+    MACROBLOCK *const x, const AV1_COMP *const cpi,
+    const TileDataEnc *tile_data, BLOCK_SIZE bsize,
+    const BUFFER_SET *const orig_dst, int64_t *const rd, RD_STATS *rd_stats_y,
+    RD_STATS *rd_stats, int *const switchable_rate,
+    const BUFFER_SET *dst_bufs[2], const int switchable_ctx[2],
+    const int skip_ver, const int skip_hor) {
+  const InterpSearchFlags *interp_search_flags = &cpi->interp_search_flags;
+  int8_t i;
+  MACROBLOCKD *const xd = &x->e_mbd;
+  MB_MODE_INFO *const mbmi = xd->mi[0];
+
+  uint16_t interp_filter_search_mask =
+      interp_search_flags->interp_filter_search_mask;
+
+  if (cpi->sf.interp_sf.adaptive_interp_filter_search == 2) {
+    const FRAME_UPDATE_TYPE update_type =
+        get_frame_update_type(&cpi->ppi->gf_group, cpi->gf_frame_index);
+    const int ctx0 = av1_get_pred_context_switchable_interp(xd, 0);
+    const int ctx1 = av1_get_pred_context_switchable_interp(xd, 1);
+    int use_actual_frame_probs = 1;
+    const int *switchable_interp_p0;
+    const int *switchable_interp_p1;
+#if CONFIG_FPMT_TEST
+    use_actual_frame_probs =
+        (cpi->ppi->fpmt_unit_test_cfg == PARALLEL_SIMULATION_ENCODE) ? 0 : 1;
+    if (!use_actual_frame_probs) {
+      switchable_interp_p0 = (int *)cpi->ppi->temp_frame_probs
+                                 .switchable_interp_probs[update_type][ctx0];
+      switchable_interp_p1 = (int *)cpi->ppi->temp_frame_probs
+                                 .switchable_interp_probs[update_type][ctx1];
+    }
+#endif
+    if (use_actual_frame_probs) {
+      switchable_interp_p0 =
+          cpi->ppi->frame_probs.switchable_interp_probs[update_type][ctx0];
+      switchable_interp_p1 =
+          cpi->ppi->frame_probs.switchable_interp_probs[update_type][ctx1];
+    }
+    static const int thr[7] = { 0, 8, 8, 8, 8, 0, 8 };
+    const int thresh = thr[update_type];
+    for (i = 0; i < SWITCHABLE_FILTERS; i++) {
+      // For non-dual case, the 2 dir's prob should be identical.
+      assert(switchable_interp_p0[i] == switchable_interp_p1[i]);
+      if (switchable_interp_p0[i] < thresh &&
+          switchable_interp_p1[i] < thresh) {
+        DUAL_FILTER_TYPE filt_type = i + SWITCHABLE_FILTERS * i;
+        reset_interp_filter_allowed_mask(&interp_filter_search_mask, filt_type);
+      }
+    }
+  }
+
+  // Regular filter evaluation should have been done and hence the same should
+  // be the winner
+  assert(x->e_mbd.mi[0]->interp_filters.as_int == filter_sets[0].as_int);
+  if ((skip_hor & skip_ver) != interp_search_flags->default_interp_skip_flags) {
+    INTERP_PRED_TYPE pred_filter_type = INTERP_HORZ_NEQ_VERT_NEQ;
+    int_interpfilters af = av1_broadcast_interp_filter(INTERP_INVALID);
+    int_interpfilters lf = af;
+
+    pred_filter_type = is_pred_filter_search_allowed(cpi, xd, bsize, &af, &lf);
+    if (pred_filter_type) {
+      assert(af.as_filters.x_filter != INTERP_INVALID);
+      int filter_idx = SWITCHABLE * af.as_filters.x_filter;
+      // This assert tells that (filter_x == filter_y) for non-dual filter case
+      assert(filter_sets[filter_idx].as_filters.x_filter ==
+             filter_sets[filter_idx].as_filters.y_filter);
+      if (cpi->sf.interp_sf.adaptive_interp_filter_search &&
+          !(get_interp_filter_allowed_mask(interp_filter_search_mask,
+                                           filter_idx))) {
+        return;
+      }
+      if (filter_idx) {
+        interpolation_filter_rd(x, cpi, tile_data, bsize, orig_dst, rd,
+                                rd_stats_y, rd_stats, switchable_rate, dst_bufs,
+                                filter_idx, switchable_ctx,
+                                (skip_hor & skip_ver));
+      }
+      return;
+    }
+  }
+  // Reuse regular filter's modeled rd data for sharp filter for following
+  // cases
+  // 1) When bsize is 4x4
+  // 2) When block width is 4 (i.e. 4x8/4x16 blocks) and MV in vertical
+  // direction is full-pel
+  // 3) When block height is 4 (i.e. 8x4/16x4 blocks) and MV in horizontal
+  // direction is full-pel
+  // TODO(any): Optimize cases 2 and 3 further if luma MV in relavant direction
+  // alone is full-pel
+
+  if ((bsize == BLOCK_4X4) ||
+      (block_size_wide[bsize] == 4 &&
+       skip_ver == interp_search_flags->default_interp_skip_flags) ||
+      (block_size_high[bsize] == 4 &&
+       skip_hor == interp_search_flags->default_interp_skip_flags)) {
+    int skip_pred = skip_hor & skip_ver;
+    uint16_t allowed_interp_mask = 0;
+
+    // REG_REG filter type is evaluated beforehand, hence skip it
+    set_interp_filter_allowed_mask(&allowed_interp_mask, SHARP_SHARP);
+    set_interp_filter_allowed_mask(&allowed_interp_mask, SMOOTH_SMOOTH);
+    if (cpi->sf.interp_sf.adaptive_interp_filter_search)
+      allowed_interp_mask &= interp_filter_search_mask;
+
+    find_best_interp_rd_facade(x, cpi, tile_data, bsize, orig_dst, rd,
+                               rd_stats_y, rd_stats, switchable_rate, dst_bufs,
+                               switchable_ctx, skip_pred, allowed_interp_mask,
+                               1);
+  } else {
+    int skip_pred = (skip_hor & skip_ver);
+    for (i = (SWITCHABLE_FILTERS + 1); i < DUAL_FILTER_SET_SIZE;
+         i += (SWITCHABLE_FILTERS + 1)) {
+      // This assert tells that (filter_x == filter_y) for non-dual filter case
+      assert(filter_sets[i].as_filters.x_filter ==
+             filter_sets[i].as_filters.y_filter);
+      if (cpi->sf.interp_sf.adaptive_interp_filter_search &&
+          !(get_interp_filter_allowed_mask(interp_filter_search_mask, i))) {
+        continue;
+      }
+      interpolation_filter_rd(x, cpi, tile_data, bsize, orig_dst, rd,
+                              rd_stats_y, rd_stats, switchable_rate, dst_bufs,
+                              i, switchable_ctx, skip_pred);
+      // In first iteration, smooth filter is evaluated. If smooth filter
+      // (which is less sharper) is the winner among regular and smooth filters,
+      // sharp filter evaluation is skipped
+      // TODO(any): Refine this gating based on modelled rd only (i.e., by not
+      // accounting switchable filter rate)
+      if (cpi->sf.interp_sf.skip_sharp_interp_filter_search &&
+          skip_pred != interp_search_flags->default_interp_skip_flags) {
+        if (mbmi->interp_filters.as_int == filter_sets[SMOOTH_SMOOTH].as_int)
+          break;
+      }
+    }
+  }
+}
+
+static INLINE void calc_interp_skip_pred_flag(MACROBLOCK *const x,
+                                              const AV1_COMP *const cpi,
+                                              int *skip_hor, int *skip_ver) {
+  const AV1_COMMON *cm = &cpi->common;
+  MACROBLOCKD *const xd = &x->e_mbd;
+  MB_MODE_INFO *const mbmi = xd->mi[0];
+  const int num_planes = av1_num_planes(cm);
+  const int is_compound = has_second_ref(mbmi);
+  assert(is_intrabc_block(mbmi) == 0);
+  for (int ref = 0; ref < 1 + is_compound; ++ref) {
+    const struct scale_factors *const sf =
+        get_ref_scale_factors_const(cm, mbmi->ref_frame[ref]);
+    // TODO(any): Refine skip flag calculation considering scaling
+    if (av1_is_scaled(sf)) {
+      *skip_hor = 0;
+      *skip_ver = 0;
+      break;
+    }
+    const MV mv = mbmi->mv[ref].as_mv;
+    int skip_hor_plane = 0;
+    int skip_ver_plane = 0;
+    for (int plane_idx = 0; plane_idx < AOMMAX(1, (num_planes - 1));
+         ++plane_idx) {
+      struct macroblockd_plane *const pd = &xd->plane[plane_idx];
+      const int bw = pd->width;
+      const int bh = pd->height;
+      const MV mv_q4 = clamp_mv_to_umv_border_sb(
+          xd, &mv, bw, bh, pd->subsampling_x, pd->subsampling_y);
+      const int sub_x = (mv_q4.col & SUBPEL_MASK) << SCALE_EXTRA_BITS;
+      const int sub_y = (mv_q4.row & SUBPEL_MASK) << SCALE_EXTRA_BITS;
+      skip_hor_plane |= ((sub_x == 0) << plane_idx);
+      skip_ver_plane |= ((sub_y == 0) << plane_idx);
+    }
+    *skip_hor &= skip_hor_plane;
+    *skip_ver &= skip_ver_plane;
+    // It is not valid that "luma MV is sub-pel, whereas chroma MV is not"
+    assert(*skip_hor != 2);
+    assert(*skip_ver != 2);
+  }
+  // When compond prediction type is compound segment wedge, luma MC and chroma
+  // MC need to go hand in hand as mask generated during luma MC is reuired for
+  // chroma MC. If skip_hor = 0 and skip_ver = 1, mask used for chroma MC during
+  // vertical filter decision may be incorrect as temporary MC evaluation
+  // overwrites the mask. Make skip_ver as 0 for this case so that mask is
+  // populated during luma MC
+  if (is_compound && mbmi->compound_idx == 1 &&
+      mbmi->interinter_comp.type == COMPOUND_DIFFWTD) {
+    assert(mbmi->comp_group_idx == 1);
+    if (*skip_hor == 0 && *skip_ver == 1) *skip_ver = 0;
+  }
+}
+
+/*!\brief AV1 interpolation filter search
+ *
+ * \ingroup inter_mode_search
+ *
+ * \param[in]     cpi               Top-level encoder structure.
+ * \param[in]     tile_data         Pointer to struct holding adaptive
+ *                                  data/contexts/models for the tile during
+ *                                  encoding.
+ * \param[in]     x                 Pointer to struc holding all the data for
+ *                                  the current macroblock.
+ * \param[in]     bsize             Current block size.
+ * \param[in]     tmp_dst           A temporary prediction buffer to hold a
+ *                                  computed prediction.
+ * \param[in,out] orig_dst          A prediction buffer to hold a computed
+ *                                  prediction. This will eventually hold the
+ *                                  final prediction, and the tmp_dst info will
+ *                                  be copied here.
+ * \param[in,out] rd                The RD cost associated with the selected
+ *                                  interpolation filter parameters.
+ * \param[in,out] switchable_rate   The rate associated with using a SWITCHABLE
+ *                                  filter mode.
+ * \param[in,out] skip_build_pred   Indicates whether or not to build the inter
+ *                                  predictor. If this is 0, the inter predictor
+ *                                  has already been built and thus we can avoid
+ *                                  repeating computation.
+ * \param[in]     args              HandleInterModeArgs struct holding
+ *                                  miscellaneous arguments for inter mode
+ *                                  search. See the documentation for this
+ *                                  struct for a description of each member.
+ * \param[in]     ref_best_rd       Best RD found so far for this block.
+ *                                  It is used for early termination of this
+ *                                  search if the RD exceeds this value.
+ *
+ * \return Returns INT64_MAX if the filter parameters are invalid and the
+ * current motion mode being tested should be skipped. It returns 0 if the
+ * parameter search is a success.
+ */
+int64_t av1_interpolation_filter_search(
+    MACROBLOCK *const x, const AV1_COMP *const cpi,
+    const TileDataEnc *tile_data, BLOCK_SIZE bsize,
+    const BUFFER_SET *const tmp_dst, const BUFFER_SET *const orig_dst,
+    int64_t *const rd, int *const switchable_rate, int *skip_build_pred,
+    HandleInterModeArgs *args, int64_t ref_best_rd) {
+  const AV1_COMMON *cm = &cpi->common;
+  const InterpSearchFlags *interp_search_flags = &cpi->interp_search_flags;
+  const int num_planes = av1_num_planes(cm);
+  MACROBLOCKD *const xd = &x->e_mbd;
+  MB_MODE_INFO *const mbmi = xd->mi[0];
+  const int need_search = av1_is_interp_needed(xd);
+  const int ref_frame = xd->mi[0]->ref_frame[0];
+  RD_STATS rd_stats_luma, rd_stats;
+
+  // Initialization of rd_stats structures with default values
+  av1_init_rd_stats(&rd_stats_luma);
+  av1_init_rd_stats(&rd_stats);
+
+  int match_found_idx = -1;
+  const InterpFilter assign_filter = cm->features.interp_filter;
+
+  match_found_idx = av1_find_interp_filter_match(
+      mbmi, cpi, assign_filter, need_search, args->interp_filter_stats,
+      args->interp_filter_stats_idx);
+
+  if (match_found_idx != -1) {
+    *rd = args->interp_filter_stats[match_found_idx].rd;
+    x->pred_sse[ref_frame] =
+        args->interp_filter_stats[match_found_idx].pred_sse;
+    *skip_build_pred = 0;
+    return 0;
+  }
+
+  int switchable_ctx[2];
+  switchable_ctx[0] = av1_get_pred_context_switchable_interp(xd, 0);
+  switchable_ctx[1] = av1_get_pred_context_switchable_interp(xd, 1);
+  *switchable_rate =
+      get_switchable_rate(x, mbmi->interp_filters, switchable_ctx,
+                          cm->seq_params->enable_dual_filter);
+
+  // Do MC evaluation for default filter_type.
+  // Luma MC
+  interp_model_rd_eval(x, cpi, bsize, orig_dst, AOM_PLANE_Y, AOM_PLANE_Y,
+                       &rd_stats_luma, *skip_build_pred);
+
+#if CONFIG_COLLECT_RD_STATS == 3
+  RD_STATS rd_stats_y;
+  av1_pick_recursive_tx_size_type_yrd(cpi, x, &rd_stats_y, bsize, INT64_MAX);
+  PrintPredictionUnitStats(cpi, tile_data, x, &rd_stats_y, bsize);
+#endif  // CONFIG_COLLECT_RD_STATS == 3
+  // Chroma MC
+  if (num_planes > 1) {
+    interp_model_rd_eval(x, cpi, bsize, orig_dst, AOM_PLANE_U, AOM_PLANE_V,
+                         &rd_stats, *skip_build_pred);
+  }
+  *skip_build_pred = 1;
+
+  av1_merge_rd_stats(&rd_stats, &rd_stats_luma);
+
+  assert(rd_stats.rate >= 0);
+
+  *rd = RDCOST(x->rdmult, *switchable_rate + rd_stats.rate, rd_stats.dist);
+  x->pred_sse[ref_frame] = (unsigned int)(rd_stats_luma.sse >> 4);
+
+  if (assign_filter != SWITCHABLE || match_found_idx != -1) {
+    return 0;
+  }
+  if (!need_search) {
+    int_interpfilters filters = av1_broadcast_interp_filter(EIGHTTAP_REGULAR);
+    assert(mbmi->interp_filters.as_int == filters.as_int);
+    (void)filters;
+    return 0;
+  }
+  if (args->modelled_rd != NULL) {
+    if (has_second_ref(mbmi)) {
+      const int ref_mv_idx = mbmi->ref_mv_idx;
+      MV_REFERENCE_FRAME *refs = mbmi->ref_frame;
+      const int mode0 = compound_ref0_mode(mbmi->mode);
+      const int mode1 = compound_ref1_mode(mbmi->mode);
+      const int64_t mrd = AOMMIN(args->modelled_rd[mode0][ref_mv_idx][refs[0]],
+                                 args->modelled_rd[mode1][ref_mv_idx][refs[1]]);
+      if ((*rd >> 1) > mrd && ref_best_rd < INT64_MAX) {
+        return INT64_MAX;
+      }
+    }
+  }
+
+  x->recalc_luma_mc_data = 0;
+  // skip_flag=xx (in binary form)
+  // Setting 0th flag corresonds to skipping luma MC and setting 1st bt
+  // corresponds to skipping chroma MC  skip_flag=0 corresponds to "Don't skip
+  // luma and chroma MC"  Skip flag=1 corresponds to "Skip Luma MC only"
+  // Skip_flag=2 is not a valid case
+  // skip_flag=3 corresponds to "Skip both luma and chroma MC"
+  int skip_hor = interp_search_flags->default_interp_skip_flags;
+  int skip_ver = interp_search_flags->default_interp_skip_flags;
+  calc_interp_skip_pred_flag(x, cpi, &skip_hor, &skip_ver);
+
+  // do interp_filter search
+  restore_dst_buf(xd, *tmp_dst, num_planes);
+  const BUFFER_SET *dst_bufs[2] = { tmp_dst, orig_dst };
+  // Evaluate dual interp filters
+  if (cm->seq_params->enable_dual_filter) {
+    if (cpi->sf.interp_sf.use_fast_interpolation_filter_search) {
+      fast_dual_interp_filter_rd(x, cpi, tile_data, bsize, orig_dst, rd,
+                                 &rd_stats_luma, &rd_stats, switchable_rate,
+                                 dst_bufs, switchable_ctx, skip_hor, skip_ver);
+    } else {
+      // Use full interpolation filter search
+      uint16_t allowed_interp_mask = ALLOW_ALL_INTERP_FILT_MASK;
+      // REG_REG filter type is evaluated beforehand, so loop is repeated over
+      // REG_SMOOTH to SHARP_SHARP for full interpolation filter search
+      reset_interp_filter_allowed_mask(&allowed_interp_mask, REG_REG);
+      find_best_interp_rd_facade(x, cpi, tile_data, bsize, orig_dst, rd,
+                                 &rd_stats_luma, &rd_stats, switchable_rate,
+                                 dst_bufs, switchable_ctx,
+                                 (skip_hor & skip_ver), allowed_interp_mask, 0);
+    }
+  } else {
+    // Evaluate non-dual interp filters
+    find_best_non_dual_interp_filter(
+        x, cpi, tile_data, bsize, orig_dst, rd, &rd_stats_luma, &rd_stats,
+        switchable_rate, dst_bufs, switchable_ctx, skip_ver, skip_hor);
+  }
+  swap_dst_buf(xd, dst_bufs, num_planes);
+  // Recompute final MC data if required
+  if (x->recalc_luma_mc_data == 1) {
+    // Recomputing final luma MC data is required only if the same was skipped
+    // in either of the directions  Condition below is necessary, but not
+    // sufficient
+    assert((skip_hor == 1) || (skip_ver == 1));
+    const int mi_row = xd->mi_row;
+    const int mi_col = xd->mi_col;
+    av1_enc_build_inter_predictor(cm, xd, mi_row, mi_col, orig_dst, bsize,
+                                  AOM_PLANE_Y, AOM_PLANE_Y);
+  }
+  x->pred_sse[ref_frame] = (unsigned int)(rd_stats_luma.sse >> 4);
+
+  // save search results
+  if (cpi->sf.interp_sf.use_interp_filter) {
+    assert(match_found_idx == -1);
+    args->interp_filter_stats_idx = save_interp_filter_search_stat(
+        mbmi, *rd, x->pred_sse[ref_frame], args->interp_filter_stats,
+        args->interp_filter_stats_idx);
+  }
+  return 0;
+}