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_segmentation.h"
23
24 #define ENERGY_MIN (-4)
25 #define ENERGY_MAX (1)
26 #define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
27 #define ENERGY_IN_BOUNDS(energy) \
28 assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
29
30 static const double rate_ratio[MAX_SEGMENTS] = { 2.5, 2.0, 1.5, 1.0,
31 0.75, 1.0, 1.0, 1.0 };
32 static const int segment_id[ENERGY_SPAN] = { 0, 1, 1, 2, 3, 4 };
33
34 #define SEGMENT_ID(i) segment_id[(i)-ENERGY_MIN]
35
36 DECLARE_ALIGNED(16, static const uint8_t, vp9_64_zeros[64]) = { 0 };
37 #if CONFIG_VP9_HIGHBITDEPTH
38 DECLARE_ALIGNED(16, static const uint16_t, vp9_highbd_64_zeros[64]) = { 0 };
39 #endif
40
vp9_vaq_segment_id(int energy)41 unsigned int vp9_vaq_segment_id(int energy) {
42 ENERGY_IN_BOUNDS(energy);
43 return SEGMENT_ID(energy);
44 }
45
vp9_vaq_frame_setup(VP9_COMP * cpi)46 void vp9_vaq_frame_setup(VP9_COMP *cpi) {
47 VP9_COMMON *cm = &cpi->common;
48 struct segmentation *seg = &cm->seg;
49 int i;
50
51 if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
52 cpi->refresh_alt_ref_frame || cpi->force_update_segmentation ||
53 (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
54 vp9_enable_segmentation(seg);
55 vp9_clearall_segfeatures(seg);
56
57 seg->abs_delta = SEGMENT_DELTADATA;
58
59 vpx_clear_system_state();
60
61 for (i = 0; i < MAX_SEGMENTS; ++i) {
62 int qindex_delta =
63 vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
64 rate_ratio[i], cm->bit_depth);
65
66 // We don't allow qindex 0 in a segment if the base value is not 0.
67 // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
68 // Q delta is sometimes applied without going back around the rd loop.
69 // This could lead to an illegal combination of partition size and q.
70 if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
71 qindex_delta = -cm->base_qindex + 1;
72 }
73
74 // No need to enable SEG_LVL_ALT_Q for this segment.
75 if (rate_ratio[i] == 1.0) {
76 continue;
77 }
78
79 vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
80 vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
81 }
82 }
83 }
84
85 /* TODO(agrange, paulwilkins): The block_variance calls the unoptimized versions
86 * of variance() and highbd_8_variance(). It should not.
87 */
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)88 static void aq_variance(const uint8_t *a, int a_stride, const uint8_t *b,
89 int b_stride, int w, int h, unsigned int *sse,
90 int *sum) {
91 int i, j;
92
93 *sum = 0;
94 *sse = 0;
95
96 for (i = 0; i < h; i++) {
97 for (j = 0; j < w; j++) {
98 const int diff = a[j] - b[j];
99 *sum += diff;
100 *sse += diff * diff;
101 }
102
103 a += a_stride;
104 b += b_stride;
105 }
106 }
107
108 #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,uint64_t * sum)109 static void aq_highbd_variance64(const uint8_t *a8, int a_stride,
110 const uint8_t *b8, int b_stride, int w, int h,
111 uint64_t *sse, uint64_t *sum) {
112 int i, j;
113
114 uint16_t *a = CONVERT_TO_SHORTPTR(a8);
115 uint16_t *b = CONVERT_TO_SHORTPTR(b8);
116 *sum = 0;
117 *sse = 0;
118
119 for (i = 0; i < h; i++) {
120 for (j = 0; j < w; j++) {
121 const int diff = a[j] - b[j];
122 *sum += diff;
123 *sse += diff * diff;
124 }
125 a += a_stride;
126 b += b_stride;
127 }
128 }
129
aq_highbd_8_variance(const uint8_t * a8,int a_stride,const uint8_t * b8,int b_stride,int w,int h,unsigned int * sse,int * sum)130 static void aq_highbd_8_variance(const uint8_t *a8, int a_stride,
131 const uint8_t *b8, int b_stride, int w, int h,
132 unsigned int *sse, int *sum) {
133 uint64_t sse_long = 0;
134 uint64_t sum_long = 0;
135 aq_highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
136 *sse = (unsigned int)sse_long;
137 *sum = (int)sum_long;
138 }
139 #endif // CONFIG_VP9_HIGHBITDEPTH
140
block_variance(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)141 static unsigned int block_variance(VP9_COMP *cpi, MACROBLOCK *x,
142 BLOCK_SIZE bs) {
143 MACROBLOCKD *xd = &x->e_mbd;
144 unsigned int var, sse;
145 int right_overflow =
146 (xd->mb_to_right_edge < 0) ? ((-xd->mb_to_right_edge) >> 3) : 0;
147 int bottom_overflow =
148 (xd->mb_to_bottom_edge < 0) ? ((-xd->mb_to_bottom_edge) >> 3) : 0;
149
150 if (right_overflow || bottom_overflow) {
151 const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;
152 const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;
153 int avg;
154 #if CONFIG_VP9_HIGHBITDEPTH
155 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
156 aq_highbd_8_variance(x->plane[0].src.buf, x->plane[0].src.stride,
157 CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, bw, bh,
158 &sse, &avg);
159 sse >>= 2 * (xd->bd - 8);
160 avg >>= (xd->bd - 8);
161 } else {
162 aq_variance(x->plane[0].src.buf, x->plane[0].src.stride, vp9_64_zeros, 0,
163 bw, bh, &sse, &avg);
164 }
165 #else
166 aq_variance(x->plane[0].src.buf, x->plane[0].src.stride, vp9_64_zeros, 0,
167 bw, bh, &sse, &avg);
168 #endif // CONFIG_VP9_HIGHBITDEPTH
169 var = sse - (unsigned int)(((int64_t)avg * avg) / (bw * bh));
170 return (unsigned int)(((uint64_t)256 * var) / (bw * bh));
171 } else {
172 #if CONFIG_VP9_HIGHBITDEPTH
173 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
174 var =
175 cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
176 CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, &sse);
177 } else {
178 var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
179 vp9_64_zeros, 0, &sse);
180 }
181 #else
182 var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
183 vp9_64_zeros, 0, &sse);
184 #endif // CONFIG_VP9_HIGHBITDEPTH
185 return (unsigned int)(((uint64_t)256 * var) >> num_pels_log2_lookup[bs]);
186 }
187 }
188
vp9_log_block_var(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)189 double vp9_log_block_var(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
190 unsigned int var = block_variance(cpi, x, bs);
191 vpx_clear_system_state();
192 return log(var + 1.0);
193 }
194
195 #define DEFAULT_E_MIDPOINT 10.0
vp9_block_energy(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)196 int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
197 double energy;
198 double energy_midpoint;
199 vpx_clear_system_state();
200 energy_midpoint =
201 (cpi->oxcf.pass == 2) ? cpi->twopass.mb_av_energy : DEFAULT_E_MIDPOINT;
202 energy = vp9_log_block_var(cpi, x, bs) - energy_midpoint;
203 return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
204 }
205