av1/encoder/nonrd_opt.h

/*
 * Copyright (c) 2022, 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.
 */

#ifndef AOM_AV1_ENCODER_NONRD_OPT_H_
#define AOM_AV1_ENCODER_NONRD_OPT_H_

#include "av1/encoder/rdopt_utils.h"

/*!\brief Finds predicted motion vectors for a block.
 *
 * \ingroup nonrd_mode_search
 * \callgraph
 * \callergraph
 * Finds predicted motion vectors for a block from a certain reference frame.
 * First, it fills reference MV stack, then picks the test from the stack and
 * predicts the final MV for a block for each mode.
 * \param[in]    cpi                      Top-level encoder structure
 * \param[in]    x                        Pointer to structure holding all the
 *                                        data for the current macroblock
 * \param[in]    ref_frame                Reference frame for which to find
 *                                        ref MVs
 * \param[in]    frame_mv                 Predicted MVs for a block
 * \param[in]    tile_data                Pointer to struct holding adaptive
 *                                        data/contexts/models for the tile
 *                                        during encoding
 * \param[in]    yv12_mb                  Buffer to hold predicted block
 * \param[in]    bsize                    Current block size
 * \param[in]    force_skip_low_temp_var  Flag indicating possible mode search
 *                                        prune for low temporal variance block
 * \param[in]    skip_pred_mv             Flag indicating to skip av1_mv_pred
 *
 * \return Nothing is returned. Instead, predicted MVs are placed into
 * \c frame_mv array
 */
static INLINE void find_predictors(
    AV1_COMP *cpi, MACROBLOCK *x, MV_REFERENCE_FRAME ref_frame,
    int_mv frame_mv[MB_MODE_COUNT][REF_FRAMES], TileDataEnc *tile_data,
    struct buf_2d yv12_mb[8][MAX_MB_PLANE], BLOCK_SIZE bsize,
    int force_skip_low_temp_var, int skip_pred_mv) {
  AV1_COMMON *const cm = &cpi->common;
  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *const mbmi = xd->mi[0];
  MB_MODE_INFO_EXT *const mbmi_ext = &x->mbmi_ext;
  const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_yv12_buf(cm, ref_frame);
  const int num_planes = av1_num_planes(cm);
  (void)tile_data;

  x->pred_mv_sad[ref_frame] = INT_MAX;
  x->pred_mv0_sad[ref_frame] = INT_MAX;
  x->pred_mv1_sad[ref_frame] = INT_MAX;
  frame_mv[NEWMV][ref_frame].as_int = INVALID_MV;
  // TODO(kyslov) this needs various further optimizations. to be continued..
  assert(yv12 != NULL);
  if (yv12 != NULL) {
    const struct scale_factors *const sf =
        get_ref_scale_factors_const(cm, ref_frame);
    av1_setup_pred_block(xd, yv12_mb[ref_frame], yv12, sf, sf, num_planes);
    av1_find_mv_refs(cm, xd, mbmi, ref_frame, mbmi_ext->ref_mv_count,
                     xd->ref_mv_stack, xd->weight, NULL, mbmi_ext->global_mvs,
                     mbmi_ext->mode_context);
    // TODO(Ravi): Populate mbmi_ext->ref_mv_stack[ref_frame][4] and
    // mbmi_ext->weight[ref_frame][4] inside av1_find_mv_refs.
    av1_copy_usable_ref_mv_stack_and_weight(xd, mbmi_ext, ref_frame);
    av1_find_best_ref_mvs_from_stack(
        cm->features.allow_high_precision_mv, mbmi_ext, ref_frame,
        &frame_mv[NEARESTMV][ref_frame], &frame_mv[NEARMV][ref_frame], 0);
    frame_mv[GLOBALMV][ref_frame] = mbmi_ext->global_mvs[ref_frame];
    // Early exit for non-LAST frame if force_skip_low_temp_var is set.
    if (!av1_is_scaled(sf) && bsize >= BLOCK_8X8 && !skip_pred_mv &&
        !(force_skip_low_temp_var && ref_frame != LAST_FRAME)) {
      av1_mv_pred(cpi, x, yv12_mb[ref_frame][0].buf, yv12->y_stride, ref_frame,
                  bsize);
    }
  }
  av1_count_overlappable_neighbors(cm, xd);
  mbmi->num_proj_ref = 1;
}

#endif  // AOM_AV1_ENCODER_NONRD_OPT_H_