52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vp9/common/vp9_tile_common.h"
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#include "vp9/common/vp9_onyxc_int.h"
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#define MIN_TILE_WIDTH_B64 4
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#define MAX_TILE_WIDTH_B64 64
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static int get_tile_offset(int idx, int mis, int log2) {
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const int sb_cols = mi_cols_aligned_to_sb(mis) >> MI_BLOCK_SIZE_LOG2;
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const int offset = ((idx * sb_cols) >> log2) << MI_BLOCK_SIZE_LOG2;
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return MIN(offset, mis);
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}
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void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) {
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tile->mi_row_start = get_tile_offset(row, cm->mi_rows, cm->log2_tile_rows);
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tile->mi_row_end = get_tile_offset(row + 1, cm->mi_rows, cm->log2_tile_rows);
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tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols);
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tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols);
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}
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void vp9_get_tile_n_bits(int mi_cols,
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int *min_log2_tile_cols, int *max_log2_tile_cols) {
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const int sb_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2;
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int min_log2 = 0, max_log2 = 0;
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// max
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while ((sb_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
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++max_log2;
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--max_log2;
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if (max_log2 < 0)
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max_log2 = 0;
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// min
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while ((MAX_TILE_WIDTH_B64 << min_log2) < sb_cols)
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++min_log2;
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assert(min_log2 <= max_log2);
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*min_log2_tile_cols = min_log2;
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*max_log2_tile_cols = max_log2;
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}
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