av1/common/tile_common.c

/*
 * 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 "av1/common/tile_common.h"
#include "av1/common/onyxc_int.h"
#include "aom_dsp/aom_dsp_common.h"

void av1_tile_set_row(TileInfo *tile, const AV1_COMMON *cm, int row) {
  tile->mi_row_start = row * cm->tile_height;
  tile->mi_row_end = AOMMIN(tile->mi_row_start + cm->tile_height, cm->mi_rows);
}

void av1_tile_set_col(TileInfo *tile, const AV1_COMMON *cm, int col) {
  tile->mi_col_start = col * cm->tile_width;
  tile->mi_col_end = AOMMIN(tile->mi_col_start + cm->tile_width, cm->mi_cols);
}

void av1_tile_init(TileInfo *tile, const AV1_COMMON *cm, int row, int col) {
  av1_tile_set_row(tile, cm, row);
  av1_tile_set_col(tile, cm, col);
}

#if !CONFIG_EXT_TILE

#if CONFIG_EXT_PARTITION
#define MIN_TILE_WIDTH_MAX_SB 2
#define MAX_TILE_WIDTH_MAX_SB 32
#else
#define MIN_TILE_WIDTH_MAX_SB 4
#define MAX_TILE_WIDTH_MAX_SB 64
#endif  // CONFIG_EXT_PARTITION

static int get_min_log2_tile_cols(const int max_sb_cols) {
  int min_log2 = 0;
  while ((MAX_TILE_WIDTH_MAX_SB << min_log2) < max_sb_cols) ++min_log2;
  return min_log2;
}

static int get_max_log2_tile_cols(const int max_sb_cols) {
  int max_log2 = 1;
  while ((max_sb_cols >> max_log2) >= MIN_TILE_WIDTH_MAX_SB) ++max_log2;
  return max_log2 - 1;
}

void av1_get_tile_n_bits(const int mi_cols, int *min_log2_tile_cols,
                         int *max_log2_tile_cols) {
  const int max_sb_cols =
      ALIGN_POWER_OF_TWO(mi_cols, MAX_MIB_SIZE_LOG2) >> MAX_MIB_SIZE_LOG2;
  *min_log2_tile_cols = get_min_log2_tile_cols(max_sb_cols);
  *max_log2_tile_cols = get_max_log2_tile_cols(max_sb_cols);
  assert(*min_log2_tile_cols <= *max_log2_tile_cols);
}
#endif  // !CONFIG_EXT_TILE