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
|
/*
* 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 <assert.h>
#include <limits.h>
#include "./aom_scale_rtcd.h"
#include "aom_dsp/psnr.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_mem/aom_mem.h"
#include "aom_ports/mem.h"
#include "av1/common/av1_loopfilter.h"
#include "av1/common/onyxc_int.h"
#include "av1/common/quant_common.h"
#include "av1/encoder/av1_quantize.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/picklpf.h"
int av1_get_max_filter_level(const AV1_COMP *cpi) {
if (cpi->oxcf.pass == 2) {
return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
: MAX_LOOP_FILTER;
} else {
return MAX_LOOP_FILTER;
}
}
static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd,
AV1_COMP *const cpi, int filt_level,
int partial_frame) {
AV1_COMMON *const cm = &cpi->common;
int64_t filt_err;
#if CONFIG_VAR_TX || CONFIG_EXT_PARTITION || CONFIG_CB4X4
av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level, 1,
partial_frame);
#else
if (cpi->num_workers > 1)
av1_loop_filter_frame_mt(cm->frame_to_show, cm, cpi->td.mb.e_mbd.plane,
filt_level, 1, partial_frame, cpi->workers,
cpi->num_workers, &cpi->lf_row_sync);
else
av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level,
1, partial_frame);
#endif
#if CONFIG_HIGHBITDEPTH
if (cm->use_highbitdepth) {
filt_err = aom_highbd_get_y_sse(sd, cm->frame_to_show);
} else {
filt_err = aom_get_y_sse(sd, cm->frame_to_show);
}
#else
filt_err = aom_get_y_sse(sd, cm->frame_to_show);
#endif // CONFIG_HIGHBITDEPTH
// Re-instate the unfiltered frame
aom_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
return filt_err;
}
int av1_search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
int partial_frame, double *best_cost_ret) {
const AV1_COMMON *const cm = &cpi->common;
const struct loopfilter *const lf = &cm->lf;
const int min_filter_level = 0;
const int max_filter_level = av1_get_max_filter_level(cpi);
int filt_direction = 0;
int64_t best_err;
int filt_best;
MACROBLOCK *x = &cpi->td.mb;
// Start the search at the previous frame filter level unless it is now out of
// range.
int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
// Sum squared error at each filter level
int64_t ss_err[MAX_LOOP_FILTER + 1];
// Set each entry to -1
memset(ss_err, 0xFF, sizeof(ss_err));
// Make a copy of the unfiltered / processed recon buffer
aom_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame);
filt_best = filt_mid;
ss_err[filt_mid] = best_err;
while (filter_step > 0) {
const int filt_high = AOMMIN(filt_mid + filter_step, max_filter_level);
const int filt_low = AOMMAX(filt_mid - filter_step, min_filter_level);
// Bias against raising loop filter in favor of lowering it.
int64_t bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
if ((cpi->oxcf.pass == 2) && (cpi->twopass.section_intra_rating < 20))
bias = (bias * cpi->twopass.section_intra_rating) / 20;
// yx, bias less for large block size
if (cm->tx_mode != ONLY_4X4) bias >>= 1;
if (filt_direction <= 0 && filt_low != filt_mid) {
// Get Low filter error score
if (ss_err[filt_low] < 0) {
ss_err[filt_low] = try_filter_frame(sd, cpi, filt_low, partial_frame);
}
// If value is close to the best so far then bias towards a lower loop
// filter value.
if (ss_err[filt_low] < (best_err + bias)) {
// Was it actually better than the previous best?
if (ss_err[filt_low] < best_err) {
best_err = ss_err[filt_low];
}
filt_best = filt_low;
}
}
// Now look at filt_high
if (filt_direction >= 0 && filt_high != filt_mid) {
if (ss_err[filt_high] < 0) {
ss_err[filt_high] = try_filter_frame(sd, cpi, filt_high, partial_frame);
}
// If value is significantly better than previous best, bias added against
// raising filter value
if (ss_err[filt_high] < (best_err - bias)) {
best_err = ss_err[filt_high];
filt_best = filt_high;
}
}
// Half the step distance if the best filter value was the same as last time
if (filt_best == filt_mid) {
filter_step /= 2;
filt_direction = 0;
} else {
filt_direction = (filt_best < filt_mid) ? -1 : 1;
filt_mid = filt_best;
}
}
// Update best error
best_err = ss_err[filt_best];
if (best_cost_ret)
*best_cost_ret = RDCOST_DBL(x->rdmult, x->rddiv, 0, best_err);
return filt_best;
}
void av1_pick_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
LPF_PICK_METHOD method) {
AV1_COMMON *const cm = &cpi->common;
struct loopfilter *const lf = &cm->lf;
lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0 : cpi->oxcf.sharpness;
if (method == LPF_PICK_MINIMAL_LPF && lf->filter_level) {
lf->filter_level = 0;
} else if (method >= LPF_PICK_FROM_Q) {
const int min_filter_level = 0;
const int max_filter_level = av1_get_max_filter_level(cpi);
const int q = av1_ac_quant(cm->base_qindex, 0, cm->bit_depth);
// These values were determined by linear fitting the result of the
// searched level, filt_guess = q * 0.316206 + 3.87252
#if CONFIG_HIGHBITDEPTH
int filt_guess;
switch (cm->bit_depth) {
case AOM_BITS_8:
filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
break;
case AOM_BITS_10:
filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20);
break;
case AOM_BITS_12:
filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22);
break;
default:
assert(0 &&
"bit_depth should be AOM_BITS_8, AOM_BITS_10 "
"or AOM_BITS_12");
return;
}
#else
int filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
#endif // CONFIG_HIGHBITDEPTH
if (cm->frame_type == KEY_FRAME) filt_guess -= 4;
lf->filter_level = clamp(filt_guess, min_filter_level, max_filter_level);
} else {
lf->filter_level = av1_search_filter_level(
sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL);
}
#if CONFIG_EXT_TILE
// TODO(any): 0 loopfilter level is only necessary if individual tile
// decoding is required. We need to communicate this requirement to this
// code and force loop filter level 0 only if required.
if (cm->tile_encoding_mode) lf->filter_level = 0;
#endif // CONFIG_EXT_TILE
}
|
