media/libvpx/vp9/common/vp9_tile_common.c@6474c204b198 (annotated)
media/libvpx/vp9/common/vp9_tile_common.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license |
| michael@0 | 5 | * that can be found in the LICENSE file in the root of the source |
| michael@0 | 6 | * tree. An additional intellectual property rights grant can be found |
| michael@0 | 7 | * in the file PATENTS. All contributing project authors may |
| michael@0 | 8 | * be found in the AUTHORS file in the root of the source tree. |
| michael@0 | 9 | */ |
| michael@0 | 10 | |
| michael@0 | 11 | #include "vp9/common/vp9_tile_common.h" |
| michael@0 | 12 | |
| michael@0 | 13 | #include "vp9/common/vp9_onyxc_int.h" |
| michael@0 | 14 | |
| michael@0 | 15 | #define MIN_TILE_WIDTH_B64 4 |
| michael@0 | 16 | #define MAX_TILE_WIDTH_B64 64 |
| michael@0 | 17 | |
| michael@0 | 18 | static int get_tile_offset(int idx, int mis, int log2) { |
| michael@0 | 19 | const int sb_cols = mi_cols_aligned_to_sb(mis) >> MI_BLOCK_SIZE_LOG2; |
| michael@0 | 20 | const int offset = ((idx * sb_cols) >> log2) << MI_BLOCK_SIZE_LOG2; |
| michael@0 | 21 | return MIN(offset, mis); |
| michael@0 | 22 | } |
| michael@0 | 23 | |
| michael@0 | 24 | void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) { |
| michael@0 | 25 | tile->mi_row_start = get_tile_offset(row, cm->mi_rows, cm->log2_tile_rows); |
| michael@0 | 26 | tile->mi_row_end = get_tile_offset(row + 1, cm->mi_rows, cm->log2_tile_rows); |
| michael@0 | 27 | tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols); |
| michael@0 | 28 | tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols); |
| michael@0 | 29 | } |
| michael@0 | 30 | |
| michael@0 | 31 | void vp9_get_tile_n_bits(int mi_cols, |
| michael@0 | 32 | int *min_log2_tile_cols, int *max_log2_tile_cols) { |
| michael@0 | 33 | const int sb_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2; |
| michael@0 | 34 | int min_log2 = 0, max_log2 = 0; |
| michael@0 | 35 | |
| michael@0 | 36 | // max |
| michael@0 | 37 | while ((sb_cols >> max_log2) >= MIN_TILE_WIDTH_B64) |
| michael@0 | 38 | ++max_log2; |
| michael@0 | 39 | --max_log2; |
| michael@0 | 40 | if (max_log2 < 0) |
| michael@0 | 41 | max_log2 = 0; |
| michael@0 | 42 | |
| michael@0 | 43 | // min |
| michael@0 | 44 | while ((MAX_TILE_WIDTH_B64 << min_log2) < sb_cols) |
| michael@0 | 45 | ++min_log2; |
| michael@0 | 46 | |
| michael@0 | 47 | assert(min_log2 <= max_log2); |
| michael@0 | 48 | |
| michael@0 | 49 | *min_log2_tile_cols = min_log2; |
| michael@0 | 50 | *max_log2_tile_cols = max_log2; |
| michael@0 | 51 | } |
