1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include <math.h>
13
14 #include "aom_ports/mem.h"
15
16 #include "av1/encoder/aq_variance.h"
17 #include "av1/common/seg_common.h"
18 #include "av1/encoder/encodeframe.h"
19 #include "av1/encoder/ratectrl.h"
20 #include "av1/encoder/rd.h"
21 #include "av1/encoder/segmentation.h"
22 #include "av1/encoder/dwt.h"
23 #include "aom_ports/system_state.h"
24
25 static const double rate_ratio[MAX_SEGMENTS] = { 2.2, 1.7, 1.3, 1.0,
26 0.9, .8, .7, .6 };
27
28 static const double deltaq_rate_ratio[MAX_SEGMENTS] = { 2.5, 2.0, 1.5, 1.0,
29 0.75, 1.0, 1.0, 1.0 };
30 #define ENERGY_MIN (-4)
31 #define ENERGY_MAX (1)
32 #define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
33 #define ENERGY_IN_BOUNDS(energy) \
34 assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
35
36 DECLARE_ALIGNED(16, static const uint8_t, av1_all_zeros[MAX_SB_SIZE]) = { 0 };
37
38 DECLARE_ALIGNED(16, static const uint16_t,
39 av1_highbd_all_zeros[MAX_SB_SIZE]) = { 0 };
40
41 static const int segment_id[ENERGY_SPAN] = { 0, 1, 1, 2, 3, 4 };
42
43 #define SEGMENT_ID(i) segment_id[(i)-ENERGY_MIN]
44
av1_vaq_frame_setup(AV1_COMP * cpi)45 void av1_vaq_frame_setup(AV1_COMP *cpi) {
46 AV1_COMMON *cm = &cpi->common;
47 const int base_qindex = cm->quant_params.base_qindex;
48 struct segmentation *seg = &cm->seg;
49 int i;
50
51 int resolution_change =
52 cm->prev_frame && (cm->width != cm->prev_frame->width ||
53 cm->height != cm->prev_frame->height);
54 int avg_energy = (int)(cpi->twopass.mb_av_energy - 2);
55 double avg_ratio;
56 if (avg_energy > 7) avg_energy = 7;
57 if (avg_energy < 0) avg_energy = 0;
58 avg_ratio = rate_ratio[avg_energy];
59
60 if (resolution_change) {
61 memset(cpi->enc_seg.map, 0, cm->mi_params.mi_rows * cm->mi_params.mi_cols);
62 av1_clearall_segfeatures(seg);
63 aom_clear_system_state();
64 av1_disable_segmentation(seg);
65 return;
66 }
67 if (frame_is_intra_only(cm) || cm->features.error_resilient_mode ||
68 cpi->refresh_alt_ref_frame ||
69 (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
70 cpi->vaq_refresh = 1;
71
72 av1_enable_segmentation(seg);
73 av1_clearall_segfeatures(seg);
74
75 aom_clear_system_state();
76
77 for (i = 0; i < MAX_SEGMENTS; ++i) {
78 // Set up avg segment id to be 1.0 and adjust the other segments around
79 // it.
80 int qindex_delta = av1_compute_qdelta_by_rate(
81 &cpi->rc, cm->current_frame.frame_type, base_qindex,
82 rate_ratio[i] / avg_ratio, cm->seq_params.bit_depth);
83
84 // We don't allow qindex 0 in a segment if the base value is not 0.
85 // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
86 // Q delta is sometimes applied without going back around the rd loop.
87 // This could lead to an illegal combination of partition size and q.
88 if ((base_qindex != 0) && ((base_qindex + qindex_delta) == 0)) {
89 qindex_delta = -base_qindex + 1;
90 }
91
92 av1_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
93 av1_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
94 }
95 }
96 }
97
av1_log_block_var(const AV1_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)98 int av1_log_block_var(const AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
99 // This functions returns a score for the blocks local variance as calculated
100 // by: sum of the log of the (4x4 variances) of each subblock to the current
101 // block (x,bs)
102 // * 32 / number of pixels in the block_size.
103 // This is used for segmentation because to avoid situations in which a large
104 // block with a gentle gradient gets marked high variance even though each
105 // subblock has a low variance. This allows us to assign the same segment
106 // number for the same sorts of area regardless of how the partitioning goes.
107
108 MACROBLOCKD *xd = &x->e_mbd;
109 double var = 0;
110 unsigned int sse;
111 int i, j;
112
113 int right_overflow =
114 (xd->mb_to_right_edge < 0) ? ((-xd->mb_to_right_edge) >> 3) : 0;
115 int bottom_overflow =
116 (xd->mb_to_bottom_edge < 0) ? ((-xd->mb_to_bottom_edge) >> 3) : 0;
117
118 const int bw = MI_SIZE * mi_size_wide[bs] - right_overflow;
119 const int bh = MI_SIZE * mi_size_high[bs] - bottom_overflow;
120
121 aom_clear_system_state();
122
123 for (i = 0; i < bh; i += 4) {
124 for (j = 0; j < bw; j += 4) {
125 if (is_cur_buf_hbd(xd)) {
126 var +=
127 log(1.0 + cpi->fn_ptr[BLOCK_4X4].vf(
128 x->plane[0].src.buf + i * x->plane[0].src.stride + j,
129 x->plane[0].src.stride,
130 CONVERT_TO_BYTEPTR(av1_highbd_all_zeros), 0, &sse) /
131 16);
132 } else {
133 var +=
134 log(1.0 + cpi->fn_ptr[BLOCK_4X4].vf(
135 x->plane[0].src.buf + i * x->plane[0].src.stride + j,
136 x->plane[0].src.stride, av1_all_zeros, 0, &sse) /
137 16);
138 }
139 }
140 }
141 // Use average of 4x4 log variance. The range for 8 bit 0 - 9.704121561.
142 var /= (bw / 4 * bh / 4);
143 if (var > 7) var = 7;
144
145 aom_clear_system_state();
146 return (int)(var);
147 }
148
149 #define DEFAULT_E_MIDPOINT 10.0
150
haar_ac_energy(MACROBLOCK * x,BLOCK_SIZE bs)151 static unsigned int haar_ac_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
152 MACROBLOCKD *xd = &x->e_mbd;
153 int stride = x->plane[0].src.stride;
154 uint8_t *buf = x->plane[0].src.buf;
155 const int bw = MI_SIZE * mi_size_wide[bs];
156 const int bh = MI_SIZE * mi_size_high[bs];
157 const int hbd = is_cur_buf_hbd(xd);
158
159 int var = 0;
160 for (int r = 0; r < bh; r += 8)
161 for (int c = 0; c < bw; c += 8) {
162 var += av1_haar_ac_sad_8x8_uint8_input(buf + c + r * stride, stride, hbd);
163 }
164
165 return (unsigned int)((uint64_t)var * 256) >> num_pels_log2_lookup[bs];
166 }
167
av1_log_block_wavelet_energy(MACROBLOCK * x,BLOCK_SIZE bs)168 double av1_log_block_wavelet_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
169 unsigned int haar_sad = haar_ac_energy(x, bs);
170 aom_clear_system_state();
171 return log(haar_sad + 1.0);
172 }
173
av1_block_wavelet_energy_level(const AV1_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)174 int av1_block_wavelet_energy_level(const AV1_COMP *cpi, MACROBLOCK *x,
175 BLOCK_SIZE bs) {
176 double energy, energy_midpoint;
177 aom_clear_system_state();
178 energy_midpoint = (is_stat_consumption_stage_twopass(cpi))
179 ? cpi->twopass.frame_avg_haar_energy
180 : DEFAULT_E_MIDPOINT;
181 energy = av1_log_block_wavelet_energy(x, bs) - energy_midpoint;
182 return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
183 }
184
av1_compute_q_from_energy_level_deltaq_mode(const AV1_COMP * const cpi,int block_var_level)185 int av1_compute_q_from_energy_level_deltaq_mode(const AV1_COMP *const cpi,
186 int block_var_level) {
187 int rate_level;
188 const AV1_COMMON *const cm = &cpi->common;
189
190 if (DELTA_Q_PERCEPTUAL_MODULATION == 1) {
191 ENERGY_IN_BOUNDS(block_var_level);
192 rate_level = SEGMENT_ID(block_var_level);
193 } else {
194 rate_level = block_var_level;
195 }
196 const int base_qindex = cm->quant_params.base_qindex;
197 int qindex_delta = av1_compute_qdelta_by_rate(
198 &cpi->rc, cm->current_frame.frame_type, base_qindex,
199 deltaq_rate_ratio[rate_level], cm->seq_params.bit_depth);
200
201 if ((base_qindex != 0) && ((base_qindex + qindex_delta) == 0)) {
202 qindex_delta = -base_qindex + 1;
203 }
204 return base_qindex + qindex_delta;
205 }
206