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
|
/*
* 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 <math.h>
#include <stdlib.h>
#include "av1/encoder/cost.h"
#include "av1/encoder/palette.h"
#include "av1/encoder/random.h"
#define AV1_K_MEANS_DIM 1
#include "av1/encoder/k_means_template.h"
#undef AV1_K_MEANS_DIM
#define AV1_K_MEANS_DIM 2
#include "av1/encoder/k_means_template.h"
#undef AV1_K_MEANS_DIM
static int int_comparer(const void *a, const void *b) {
return (*(int *)a - *(int *)b);
}
int av1_remove_duplicates(int *centroids, int num_centroids) {
int num_unique; // number of unique centroids
int i;
qsort(centroids, num_centroids, sizeof(*centroids), int_comparer);
// Remove duplicates.
num_unique = 1;
for (i = 1; i < num_centroids; ++i) {
if (centroids[i] != centroids[i - 1]) { // found a new unique centroid
centroids[num_unique++] = centroids[i];
}
}
return num_unique;
}
static int delta_encode_cost(const int *colors, int num, int bit_depth,
int min_val) {
if (num <= 0) return 0;
int bits_cost = bit_depth;
if (num == 1) return bits_cost;
bits_cost += 2;
int max_delta = 0;
int deltas[PALETTE_MAX_SIZE];
const int min_bits = bit_depth - 3;
for (int i = 1; i < num; ++i) {
const int delta = colors[i] - colors[i - 1];
deltas[i - 1] = delta;
assert(delta >= min_val);
if (delta > max_delta) max_delta = delta;
}
int bits_per_delta = AOMMAX(av1_ceil_log2(max_delta + 1 - min_val), min_bits);
assert(bits_per_delta <= bit_depth);
int range = (1 << bit_depth) - colors[0] - min_val;
for (int i = 0; i < num - 1; ++i) {
bits_cost += bits_per_delta;
range -= deltas[i];
bits_per_delta = AOMMIN(bits_per_delta, av1_ceil_log2(range));
}
return bits_cost;
}
int av1_index_color_cache(const uint16_t *color_cache, int n_cache,
const uint16_t *colors, int n_colors,
uint8_t *cache_color_found, int *out_cache_colors) {
if (n_cache <= 0) {
for (int i = 0; i < n_colors; ++i) out_cache_colors[i] = colors[i];
return n_colors;
}
memset(cache_color_found, 0, n_cache * sizeof(*cache_color_found));
int n_in_cache = 0;
int in_cache_flags[PALETTE_MAX_SIZE];
memset(in_cache_flags, 0, sizeof(in_cache_flags));
for (int i = 0; i < n_cache && n_in_cache < n_colors; ++i) {
for (int j = 0; j < n_colors; ++j) {
if (colors[j] == color_cache[i]) {
in_cache_flags[j] = 1;
cache_color_found[i] = 1;
++n_in_cache;
break;
}
}
}
int j = 0;
for (int i = 0; i < n_colors; ++i)
if (!in_cache_flags[i]) out_cache_colors[j++] = colors[i];
assert(j == n_colors - n_in_cache);
return j;
}
int av1_get_palette_delta_bits_v(const PALETTE_MODE_INFO *const pmi,
int bit_depth, int *zero_count,
int *min_bits) {
const int n = pmi->palette_size[1];
const int max_val = 1 << bit_depth;
int max_d = 0;
*min_bits = bit_depth - 4;
*zero_count = 0;
for (int i = 1; i < n; ++i) {
const int delta = pmi->palette_colors[2 * PALETTE_MAX_SIZE + i] -
pmi->palette_colors[2 * PALETTE_MAX_SIZE + i - 1];
const int v = abs(delta);
const int d = AOMMIN(v, max_val - v);
if (d > max_d) max_d = d;
if (d == 0) ++(*zero_count);
}
return AOMMAX(av1_ceil_log2(max_d + 1), *min_bits);
}
int av1_palette_color_cost_y(const PALETTE_MODE_INFO *const pmi,
uint16_t *color_cache, int n_cache,
int bit_depth) {
const int n = pmi->palette_size[0];
int out_cache_colors[PALETTE_MAX_SIZE];
uint8_t cache_color_found[2 * PALETTE_MAX_SIZE];
const int n_out_cache =
av1_index_color_cache(color_cache, n_cache, pmi->palette_colors, n,
cache_color_found, out_cache_colors);
const int total_bits =
n_cache + delta_encode_cost(out_cache_colors, n_out_cache, bit_depth, 1);
return av1_cost_literal(total_bits);
}
int av1_palette_color_cost_uv(const PALETTE_MODE_INFO *const pmi,
uint16_t *color_cache, int n_cache,
int bit_depth) {
const int n = pmi->palette_size[1];
int total_bits = 0;
// U channel palette color cost.
int out_cache_colors[PALETTE_MAX_SIZE];
uint8_t cache_color_found[2 * PALETTE_MAX_SIZE];
const int n_out_cache = av1_index_color_cache(
color_cache, n_cache, pmi->palette_colors + PALETTE_MAX_SIZE, n,
cache_color_found, out_cache_colors);
total_bits +=
n_cache + delta_encode_cost(out_cache_colors, n_out_cache, bit_depth, 0);
// V channel palette color cost.
int zero_count = 0, min_bits_v = 0;
const int bits_v =
av1_get_palette_delta_bits_v(pmi, bit_depth, &zero_count, &min_bits_v);
const int bits_using_delta =
2 + bit_depth + (bits_v + 1) * (n - 1) - zero_count;
const int bits_using_raw = bit_depth * n;
total_bits += 1 + AOMMIN(bits_using_delta, bits_using_raw);
return av1_cost_literal(total_bits);
}
|
