1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
// Copyright 2019 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/prediction_mask.h"
#include <algorithm>
#include <array>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <memory>
#include "src/utils/array_2d.h"
#include "src/utils/bit_mask_set.h"
#include "src/utils/common.h"
#include "src/utils/constants.h"
#include "src/utils/logging.h"
#include "src/utils/memory.h"
namespace libgav1 {
namespace {
constexpr int kWedgeDirectionTypes = 16;
enum kWedgeDirection : uint8_t {
kWedgeHorizontal,
kWedgeVertical,
kWedgeOblique27,
kWedgeOblique63,
kWedgeOblique117,
kWedgeOblique153,
};
constexpr uint8_t kWedgeCodebook[3][16][3] = {{{kWedgeOblique27, 4, 4},
{kWedgeOblique63, 4, 4},
{kWedgeOblique117, 4, 4},
{kWedgeOblique153, 4, 4},
{kWedgeHorizontal, 4, 2},
{kWedgeHorizontal, 4, 4},
{kWedgeHorizontal, 4, 6},
{kWedgeVertical, 4, 4},
{kWedgeOblique27, 4, 2},
{kWedgeOblique27, 4, 6},
{kWedgeOblique153, 4, 2},
{kWedgeOblique153, 4, 6},
{kWedgeOblique63, 2, 4},
{kWedgeOblique63, 6, 4},
{kWedgeOblique117, 2, 4},
{kWedgeOblique117, 6, 4}},
{{kWedgeOblique27, 4, 4},
{kWedgeOblique63, 4, 4},
{kWedgeOblique117, 4, 4},
{kWedgeOblique153, 4, 4},
{kWedgeVertical, 2, 4},
{kWedgeVertical, 4, 4},
{kWedgeVertical, 6, 4},
{kWedgeHorizontal, 4, 4},
{kWedgeOblique27, 4, 2},
{kWedgeOblique27, 4, 6},
{kWedgeOblique153, 4, 2},
{kWedgeOblique153, 4, 6},
{kWedgeOblique63, 2, 4},
{kWedgeOblique63, 6, 4},
{kWedgeOblique117, 2, 4},
{kWedgeOblique117, 6, 4}},
{{kWedgeOblique27, 4, 4},
{kWedgeOblique63, 4, 4},
{kWedgeOblique117, 4, 4},
{kWedgeOblique153, 4, 4},
{kWedgeHorizontal, 4, 2},
{kWedgeHorizontal, 4, 6},
{kWedgeVertical, 2, 4},
{kWedgeVertical, 6, 4},
{kWedgeOblique27, 4, 2},
{kWedgeOblique27, 4, 6},
{kWedgeOblique153, 4, 2},
{kWedgeOblique153, 4, 6},
{kWedgeOblique63, 2, 4},
{kWedgeOblique63, 6, 4},
{kWedgeOblique117, 2, 4},
{kWedgeOblique117, 6, 4}}};
constexpr BitMaskSet kWedgeFlipSignMasks[9] = {
BitMaskSet(0xBBFF), // kBlock8x8
BitMaskSet(0xBBEF), // kBlock8x16
BitMaskSet(0xBAEF), // kBlock8x32
BitMaskSet(0xBBEF), // kBlock16x8
BitMaskSet(0xBBFF), // kBlock16x16
BitMaskSet(0xBBEF), // kBlock16x32
BitMaskSet(0xABEF), // kBlock32x8
BitMaskSet(0xBBEF), // kBlock32x16
BitMaskSet(0xBBFF) // kBlock32x32
};
// This table (and the one below) contains a few leading zeros and trailing 64s
// to avoid some additional memcpys where it is actually used.
constexpr uint8_t kWedgeMasterObliqueOdd[kWedgeMaskMasterSize * 3 / 2] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 6, 18, 37,
53, 60, 63, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64};
constexpr uint8_t kWedgeMasterObliqueEven[kWedgeMaskMasterSize * 3 / 2] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 4, 11, 27,
46, 58, 62, 63, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64};
constexpr uint8_t kWedgeMasterVertical[kWedgeMaskMasterSize] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 7, 21,
43, 57, 62, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64};
int BlockShape(BlockSize block_size) {
const int width = kNum4x4BlocksWide[block_size];
const int height = kNum4x4BlocksHigh[block_size];
if (height > width) return 0;
if (height < width) return 1;
return 2;
}
uint8_t GetWedgeDirection(BlockSize block_size, int index) {
return kWedgeCodebook[BlockShape(block_size)][index][0];
}
uint8_t GetWedgeOffsetX(BlockSize block_size, int index) {
return kWedgeCodebook[BlockShape(block_size)][index][1];
}
uint8_t GetWedgeOffsetY(BlockSize block_size, int index) {
return kWedgeCodebook[BlockShape(block_size)][index][2];
}
} // namespace
bool GenerateWedgeMask(WedgeMaskArray* const wedge_masks) {
// Generate master masks.
uint8_t master_mask[6][kWedgeMaskMasterSize][kWedgeMaskMasterSize];
for (int y = 0; y < kWedgeMaskMasterSize; ++y) {
memcpy(master_mask[kWedgeVertical][y], kWedgeMasterVertical,
kWedgeMaskMasterSize);
}
for (int y = 0, shift = 0; y < kWedgeMaskMasterSize; y += 2, ++shift) {
memcpy(master_mask[kWedgeOblique63][y], kWedgeMasterObliqueEven + shift,
kWedgeMaskMasterSize);
memcpy(master_mask[kWedgeOblique63][y + 1], kWedgeMasterObliqueOdd + shift,
kWedgeMaskMasterSize);
}
for (int y = 0; y < kWedgeMaskMasterSize; ++y) {
for (int x = 0; x < kWedgeMaskMasterSize; ++x) {
const uint8_t mask_value = master_mask[kWedgeOblique63][y][x];
master_mask[kWedgeHorizontal][x][y] = master_mask[kWedgeVertical][y][x];
master_mask[kWedgeOblique27][x][y] = mask_value;
master_mask[kWedgeOblique117][y][kWedgeMaskMasterSize - 1 - x] =
64 - mask_value;
master_mask[kWedgeOblique153][(kWedgeMaskMasterSize - 1 - x)][y] =
64 - mask_value;
}
}
// Generate wedge masks.
int block_size_index = 0;
for (int size = kBlock8x8; size <= kBlock32x32; ++size) {
if (!kIsWedgeCompoundModeAllowed.Contains(size)) continue;
const int width = kBlockWidthPixels[size];
const int height = kBlockHeightPixels[size];
assert(width >= 8);
assert(width <= 32);
assert(height >= 8);
assert(height <= 32);
const auto block_size = static_cast<BlockSize>(size);
for (int wedge_index = 0; wedge_index < kWedgeDirectionTypes;
++wedge_index) {
const uint8_t direction = GetWedgeDirection(block_size, wedge_index);
const uint8_t offset_x =
DivideBy2(kWedgeMaskMasterSize) -
((GetWedgeOffsetX(block_size, wedge_index) * width) >> 3);
const uint8_t offset_y =
DivideBy2(kWedgeMaskMasterSize) -
((GetWedgeOffsetY(block_size, wedge_index) * height) >> 3);
// Allocate the 2d array.
for (int flip_sign = 0; flip_sign < 2; ++flip_sign) {
if (!((*wedge_masks)[block_size_index][flip_sign][wedge_index].Reset(
height, width, /*zero_initialize=*/false))) {
LIBGAV1_DLOG(ERROR, "Failed to allocate memory for wedge masks.");
return false;
}
}
const auto flip_sign = static_cast<uint8_t>(
kWedgeFlipSignMasks[block_size_index].Contains(wedge_index));
uint8_t* wedge_masks_row =
(*wedge_masks)[block_size_index][flip_sign][wedge_index][0];
uint8_t* wedge_masks_row_flip =
(*wedge_masks)[block_size_index][1 - flip_sign][wedge_index][0];
uint8_t* master_mask_row = &master_mask[direction][offset_y][offset_x];
for (int y = 0; y < height; ++y) {
memcpy(wedge_masks_row, master_mask_row, width);
for (int x = 0; x < width; ++x) {
wedge_masks_row_flip[x] = 64 - wedge_masks_row[x];
}
wedge_masks_row += width;
wedge_masks_row_flip += width;
master_mask_row += kWedgeMaskMasterSize;
}
}
block_size_index++;
}
return true;
}
} // namespace libgav1
|
