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
24 static const double rate_ratio[MAX_SEGMENTS] = { 2.2, 1.7, 1.3, 1.0,
25 0.9, .8, .7, .6 };
26
27 static const double deltaq_rate_ratio[MAX_SEGMENTS] = { 2.5, 2.0, 1.5, 1.0,
28 0.75, 1.0, 1.0, 1.0 };
29 #define ENERGY_MIN (-4)
30 #define ENERGY_MAX (1)
31 #define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
32 #define ENERGY_IN_BOUNDS(energy) \
33 assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
34
35 DECLARE_ALIGNED(16, static const uint8_t, av1_all_zeros[MAX_SB_SIZE]) = { 0 };
36
37 DECLARE_ALIGNED(16, static const uint16_t,
38 av1_highbd_all_zeros[MAX_SB_SIZE]) = { 0 };
39
40 static const int segment_id[ENERGY_SPAN] = { 0, 1, 1, 2, 3, 4 };
41
42 #define SEGMENT_ID(i) segment_id[(i)-ENERGY_MIN]
43
av1_vaq_frame_setup(AV1_COMP * cpi)44 void av1_vaq_frame_setup(AV1_COMP *cpi) {
45 AV1_COMMON *cm = &cpi->common;
46 const RefreshFrameInfo *const refresh_frame = &cpi->refresh_frame;
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_frame.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 av1_disable_segmentation(seg);
64 return;
65 }
66 if (frame_is_intra_only(cm) || cm->features.error_resilient_mode ||
67 refresh_frame->alt_ref_frame ||
68 (refresh_frame->golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
69 cpi->vaq_refresh = 1;
70
71 av1_enable_segmentation(seg);
72 av1_clearall_segfeatures(seg);
73
74 for (i = 0; i < MAX_SEGMENTS; ++i) {
75 // Set up avg segment id to be 1.0 and adjust the other segments around
76 // it.
77 int qindex_delta =
78 av1_compute_qdelta_by_rate(cpi, cm->current_frame.frame_type,
79 base_qindex, rate_ratio[i] / avg_ratio);
80
81 // We don't allow qindex 0 in a segment if the base value is not 0.
82 // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
83 // Q delta is sometimes applied without going back around the rd loop.
84 // This could lead to an illegal combination of partition size and q.
85 if ((base_qindex != 0) && ((base_qindex + qindex_delta) == 0)) {
86 qindex_delta = -base_qindex + 1;
87 }
88
89 av1_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
90 av1_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
91 }
92 }
93 }
94
av1_log_block_var(const AV1_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)95 int av1_log_block_var(const AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
96 // This functions returns a score for the blocks local variance as calculated
97 // by: sum of the log of the (4x4 variances) of each subblock to the current
98 // block (x,bs)
99 // * 32 / number of pixels in the block_size.
100 // This is used for segmentation because to avoid situations in which a large
101 // block with a gentle gradient gets marked high variance even though each
102 // subblock has a low variance. This allows us to assign the same segment
103 // number for the same sorts of area regardless of how the partitioning goes.
104
105 MACROBLOCKD *xd = &x->e_mbd;
106 double var = 0;
107 unsigned int sse;
108 int i, j;
109
110 int right_overflow =
111 (xd->mb_to_right_edge < 0) ? ((-xd->mb_to_right_edge) >> 3) : 0;
112 int bottom_overflow =
113 (xd->mb_to_bottom_edge < 0) ? ((-xd->mb_to_bottom_edge) >> 3) : 0;
114
115 const int bw = MI_SIZE * mi_size_wide[bs] - right_overflow;
116 const int bh = MI_SIZE * mi_size_high[bs] - bottom_overflow;
117
118 for (i = 0; i < bh; i += 4) {
119 for (j = 0; j < bw; j += 4) {
120 if (is_cur_buf_hbd(xd)) {
121 var +=
122 log(1.0 + cpi->ppi->fn_ptr[BLOCK_4X4].vf(
123 x->plane[0].src.buf + i * x->plane[0].src.stride + j,
124 x->plane[0].src.stride,
125 CONVERT_TO_BYTEPTR(av1_highbd_all_zeros), 0, &sse) /
126 16.0);
127 } else {
128 var +=
129 log(1.0 + cpi->ppi->fn_ptr[BLOCK_4X4].vf(
130 x->plane[0].src.buf + i * x->plane[0].src.stride + j,
131 x->plane[0].src.stride, av1_all_zeros, 0, &sse) /
132 16.0);
133 }
134 }
135 }
136 // Use average of 4x4 log variance. The range for 8 bit 0 - 9.704121561.
137 var /= (bw / 4 * bh / 4);
138 if (var > 7) var = 7;
139
140 return (int)(var);
141 }
142
av1_log_block_avg(const AV1_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs,int mi_row,int mi_col)143 int av1_log_block_avg(const AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs,
144 int mi_row, int mi_col) {
145 // This functions returns the block average of luma block
146 unsigned int sum, avg, num_pix;
147 int r, c;
148 const int pic_w = cpi->common.width;
149 const int pic_h = cpi->common.height;
150 const int bw = MI_SIZE * mi_size_wide[bs];
151 const int bh = MI_SIZE * mi_size_high[bs];
152 const uint16_t *x16 = CONVERT_TO_SHORTPTR(x->plane[0].src.buf);
153
154 sum = 0;
155 num_pix = 0;
156 avg = 0;
157 int row = mi_row << MI_SIZE_LOG2;
158 int col = mi_col << MI_SIZE_LOG2;
159 for (r = row; (r < (row + bh)) && (r < pic_h); r++) {
160 for (c = col; (c < (col + bw)) && (c < pic_w); c++) {
161 sum += *(x16 + r * x->plane[0].src.stride + c);
162 num_pix++;
163 }
164 }
165 if (num_pix != 0) {
166 avg = sum / num_pix;
167 }
168 return avg;
169 }
170
171 #define DEFAULT_E_MIDPOINT 10.0
172
haar_ac_energy(MACROBLOCK * x,BLOCK_SIZE bs)173 static unsigned int haar_ac_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
174 MACROBLOCKD *xd = &x->e_mbd;
175 int stride = x->plane[0].src.stride;
176 uint8_t *buf = x->plane[0].src.buf;
177 const int num_8x8_cols = block_size_wide[bs] / 8;
178 const int num_8x8_rows = block_size_high[bs] / 8;
179 const int hbd = is_cur_buf_hbd(xd);
180
181 int64_t var = av1_haar_ac_sad_mxn_uint8_input(buf, stride, hbd, num_8x8_rows,
182 num_8x8_cols);
183
184 return (unsigned int)((uint64_t)var * 256) >> num_pels_log2_lookup[bs];
185 }
186
av1_log_block_wavelet_energy(MACROBLOCK * x,BLOCK_SIZE bs)187 double av1_log_block_wavelet_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
188 unsigned int haar_sad = haar_ac_energy(x, bs);
189 return log(haar_sad + 1.0);
190 }
191
av1_block_wavelet_energy_level(const AV1_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)192 int av1_block_wavelet_energy_level(const AV1_COMP *cpi, MACROBLOCK *x,
193 BLOCK_SIZE bs) {
194 double energy, energy_midpoint;
195 energy_midpoint = (is_stat_consumption_stage_twopass(cpi))
196 ? cpi->twopass_frame.frame_avg_haar_energy
197 : DEFAULT_E_MIDPOINT;
198 energy = av1_log_block_wavelet_energy(x, bs) - energy_midpoint;
199 return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
200 }
201
av1_compute_q_from_energy_level_deltaq_mode(const AV1_COMP * const cpi,int block_var_level)202 int av1_compute_q_from_energy_level_deltaq_mode(const AV1_COMP *const cpi,
203 int block_var_level) {
204 int rate_level;
205 const AV1_COMMON *const cm = &cpi->common;
206
207 if (DELTA_Q_PERCEPTUAL_MODULATION == 1) {
208 ENERGY_IN_BOUNDS(block_var_level);
209 rate_level = SEGMENT_ID(block_var_level);
210 } else {
211 rate_level = block_var_level;
212 }
213 const int base_qindex = cm->quant_params.base_qindex;
214 int qindex_delta =
215 av1_compute_qdelta_by_rate(cpi, cm->current_frame.frame_type, base_qindex,
216 deltaq_rate_ratio[rate_level]);
217
218 if ((base_qindex != 0) && ((base_qindex + qindex_delta) == 0)) {
219 qindex_delta = -base_qindex + 1;
220 }
221 return base_qindex + qindex_delta;
222 }
223