1 /*
2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <math.h>
12
13 #include "vpx_ports/mem.h"
14 #include "vpx_ports/system_state.h"
15
16 #include "vp9/encoder/vp9_aq_variance.h"
17
18 #include "vp9/common/vp9_seg_common.h"
19
20 #include "vp9/encoder/vp9_ratectrl.h"
21 #include "vp9/encoder/vp9_rd.h"
22 #include "vp9/encoder/vp9_encodeframe.h"
23 #include "vp9/encoder/vp9_segmentation.h"
24
25 #define ENERGY_MIN (-4)
26 #define ENERGY_MAX (1)
27 #define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
28 #define ENERGY_IN_BOUNDS(energy) \
29 assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
30
31 static const double rate_ratio[MAX_SEGMENTS] = { 2.5, 2.0, 1.5, 1.0,
32 0.75, 1.0, 1.0, 1.0 };
33 static const int segment_id[ENERGY_SPAN] = { 0, 1, 1, 2, 3, 4 };
34
35 #define SEGMENT_ID(i) segment_id[(i)-ENERGY_MIN]
36
37 DECLARE_ALIGNED(16, static const uint8_t, vp9_64_zeros[64]) = { 0 };
38 #if CONFIG_VP9_HIGHBITDEPTH
39 DECLARE_ALIGNED(16, static const uint16_t, vp9_highbd_64_zeros[64]) = { 0 };
40 #endif
41
vp9_vaq_segment_id(int energy)42 unsigned int vp9_vaq_segment_id(int energy) {
43 ENERGY_IN_BOUNDS(energy);
44 return SEGMENT_ID(energy);
45 }
46
vp9_vaq_frame_setup(VP9_COMP * cpi)47 void vp9_vaq_frame_setup(VP9_COMP *cpi) {
48 VP9_COMMON *cm = &cpi->common;
49 struct segmentation *seg = &cm->seg;
50 int i;
51
52 if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
53 cpi->refresh_alt_ref_frame || cpi->force_update_segmentation ||
54 (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
55 vp9_enable_segmentation(seg);
56 vp9_clearall_segfeatures(seg);
57
58 seg->abs_delta = SEGMENT_DELTADATA;
59
60 vpx_clear_system_state();
61
62 for (i = 0; i < MAX_SEGMENTS; ++i) {
63 int qindex_delta =
64 vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
65 rate_ratio[i], cm->bit_depth);
66
67 // We don't allow qindex 0 in a segment if the base value is not 0.
68 // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
69 // Q delta is sometimes applied without going back around the rd loop.
70 // This could lead to an illegal combination of partition size and q.
71 if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
72 qindex_delta = -cm->base_qindex + 1;
73 }
74
75 // No need to enable SEG_LVL_ALT_Q for this segment.
76 if (rate_ratio[i] == 1.0) {
77 continue;
78 }
79
80 vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
81 vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
82 }
83 }
84 }
85
86 /* TODO(agrange, paulwilkins): The block_variance calls the unoptimized versions
87 * of variance() and highbd_8_variance(). It should not.
88 */
aq_variance(const uint8_t * a,int a_stride,const uint8_t * b,int b_stride,int w,int h,unsigned int * sse,int * sum)89 static void aq_variance(const uint8_t *a, int a_stride, const uint8_t *b,
90 int b_stride, int w, int h, unsigned int *sse,
91 int *sum) {
92 int i, j;
93
94 *sum = 0;
95 *sse = 0;
96
97 for (i = 0; i < h; i++) {
98 for (j = 0; j < w; j++) {
99 const int diff = a[j] - b[j];
100 *sum += diff;
101 *sse += diff * diff;
102 }
103
104 a += a_stride;
105 b += b_stride;
106 }
107 }
108
109 #if CONFIG_VP9_HIGHBITDEPTH
aq_highbd_variance64(const uint8_t * a8,int a_stride,const uint8_t * b8,int b_stride,int w,int h,uint64_t * sse,int64_t * sum)110 static void aq_highbd_variance64(const uint8_t *a8, int a_stride,
111 const uint8_t *b8, int b_stride, int w, int h,
112 uint64_t *sse, int64_t *sum) {
113 int i, j;
114
115 uint16_t *a = CONVERT_TO_SHORTPTR(a8);
116 uint16_t *b = CONVERT_TO_SHORTPTR(b8);
117 *sum = 0;
118 *sse = 0;
119
120 for (i = 0; i < h; i++) {
121 for (j = 0; j < w; j++) {
122 const int diff = a[j] - b[j];
123 *sum += diff;
124 *sse += diff * diff;
125 }
126 a += a_stride;
127 b += b_stride;
128 }
129 }
130
131 #endif // CONFIG_VP9_HIGHBITDEPTH
132
block_variance(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)133 static unsigned int block_variance(VP9_COMP *cpi, MACROBLOCK *x,
134 BLOCK_SIZE bs) {
135 MACROBLOCKD *xd = &x->e_mbd;
136 unsigned int var, sse;
137 int right_overflow =
138 (xd->mb_to_right_edge < 0) ? ((-xd->mb_to_right_edge) >> 3) : 0;
139 int bottom_overflow =
140 (xd->mb_to_bottom_edge < 0) ? ((-xd->mb_to_bottom_edge) >> 3) : 0;
141
142 if (right_overflow || bottom_overflow) {
143 const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;
144 const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;
145 int avg;
146 #if CONFIG_VP9_HIGHBITDEPTH
147 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
148 uint64_t sse64 = 0;
149 int64_t sum64 = 0;
150 aq_highbd_variance64(x->plane[0].src.buf, x->plane[0].src.stride,
151 CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, bw, bh,
152 &sse64, &sum64);
153 sse = (unsigned int)(sse64 >> (2 * (xd->bd - 8)));
154 avg = (int)(sum64 >> (xd->bd - 8));
155 } else {
156 aq_variance(x->plane[0].src.buf, x->plane[0].src.stride, vp9_64_zeros, 0,
157 bw, bh, &sse, &avg);
158 }
159 #else
160 aq_variance(x->plane[0].src.buf, x->plane[0].src.stride, vp9_64_zeros, 0,
161 bw, bh, &sse, &avg);
162 #endif // CONFIG_VP9_HIGHBITDEPTH
163 var = sse - (unsigned int)(((int64_t)avg * avg) / (bw * bh));
164 return (unsigned int)(((uint64_t)256 * var) / (bw * bh));
165 } else {
166 #if CONFIG_VP9_HIGHBITDEPTH
167 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
168 var =
169 cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
170 CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, &sse);
171 } else {
172 var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
173 vp9_64_zeros, 0, &sse);
174 }
175 #else
176 var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
177 vp9_64_zeros, 0, &sse);
178 #endif // CONFIG_VP9_HIGHBITDEPTH
179 return (unsigned int)(((uint64_t)256 * var) >> num_pels_log2_lookup[bs]);
180 }
181 }
182
vp9_log_block_var(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)183 double vp9_log_block_var(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
184 unsigned int var = block_variance(cpi, x, bs);
185 vpx_clear_system_state();
186 return log(var + 1.0);
187 }
188
189 // Get the range of sub block energy values;
vp9_get_sub_block_energy(VP9_COMP * cpi,MACROBLOCK * mb,int mi_row,int mi_col,BLOCK_SIZE bsize,int * min_e,int * max_e)190 void vp9_get_sub_block_energy(VP9_COMP *cpi, MACROBLOCK *mb, int mi_row,
191 int mi_col, BLOCK_SIZE bsize, int *min_e,
192 int *max_e) {
193 VP9_COMMON *const cm = &cpi->common;
194 const int bw = num_8x8_blocks_wide_lookup[bsize];
195 const int bh = num_8x8_blocks_high_lookup[bsize];
196 const int xmis = VPXMIN(cm->mi_cols - mi_col, bw);
197 const int ymis = VPXMIN(cm->mi_rows - mi_row, bh);
198 int x, y;
199
200 if (xmis < bw || ymis < bh) {
201 vp9_setup_src_planes(mb, cpi->Source, mi_row, mi_col);
202 *min_e = vp9_block_energy(cpi, mb, bsize);
203 *max_e = *min_e;
204 } else {
205 int energy;
206 *min_e = ENERGY_MAX;
207 *max_e = ENERGY_MIN;
208
209 for (y = 0; y < ymis; ++y) {
210 for (x = 0; x < xmis; ++x) {
211 vp9_setup_src_planes(mb, cpi->Source, mi_row + y, mi_col + x);
212 energy = vp9_block_energy(cpi, mb, BLOCK_8X8);
213 *min_e = VPXMIN(*min_e, energy);
214 *max_e = VPXMAX(*max_e, energy);
215 }
216 }
217 }
218
219 // Re-instate source pointers back to what they should have been on entry.
220 vp9_setup_src_planes(mb, cpi->Source, mi_row, mi_col);
221 }
222
223 #define DEFAULT_E_MIDPOINT 10.0
vp9_block_energy(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)224 int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
225 double energy;
226 double energy_midpoint;
227 vpx_clear_system_state();
228 energy_midpoint =
229 (cpi->oxcf.pass == 2) ? cpi->twopass.mb_av_energy : DEFAULT_E_MIDPOINT;
230 energy = vp9_log_block_var(cpi, x, bs) - energy_midpoint;
231 return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
232 }
233