ref: 048b9d41a6718e5b491dc9dd3fbaa9939fa07cb5
dir: /vp9/common/vp9_tile_common.c/
/* * 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 "vp9/common/vp9_tile_common.h" void vp9_get_tile_offsets(VP9_COMMON *cm, int *min_tile_off, int *max_tile_off) { const int log2_n_tiles = cm->log2_tile_columns; const int tile_idx = cm->cur_tile_idx; const int mb_cols = cm->mb_cols; const int sb_cols = (mb_cols + 3) >> 2; const int sb_off1 = (tile_idx * sb_cols) >> log2_n_tiles; const int sb_off2 = ((tile_idx + 1) * sb_cols) >> log2_n_tiles; *min_tile_off = (sb_off1 << 2) > mb_cols ? mb_cols : (sb_off1 << 2); *max_tile_off = (sb_off2 << 2) > mb_cols ? mb_cols : (sb_off2 << 2); } #define MIN_TILE_WIDTH_SBS (MIN_TILE_WIDTH >> 6) #define MAX_TILE_WIDTH_SBS (MAX_TILE_WIDTH >> 6) void vp9_get_tile_n_bits(VP9_COMMON *cm, int *min_log2_n_tiles_ptr, int *delta_log2_n_tiles) { const int sb_cols = (cm->mb_cols + 3) >> 2; int min_log2_n_tiles, max_log2_n_tiles; for (max_log2_n_tiles = 0; (sb_cols >> max_log2_n_tiles) >= MIN_TILE_WIDTH_SBS; max_log2_n_tiles++) {} for (min_log2_n_tiles = 0; (MAX_TILE_WIDTH_SBS << min_log2_n_tiles) < sb_cols; min_log2_n_tiles++) {} *min_log2_n_tiles_ptr = min_log2_n_tiles; *delta_log2_n_tiles = max_log2_n_tiles - min_log2_n_tiles; }