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 "vp9/encoder/vp9_aq_variance.h"
14
15 #include "vp9/common/vp9_seg_common.h"
16
17 #include "vp9/encoder/vp9_ratectrl.h"
18 #include "vp9/encoder/vp9_rdopt.h"
19 #include "vp9/encoder/vp9_segmentation.h"
20 #include "vp9/common/vp9_systemdependent.h"
21
22 #define ENERGY_MIN (-1)
23 #define ENERGY_MAX (1)
24 #define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
25 #define ENERGY_IN_BOUNDS(energy)\
26 assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
27
28 static double q_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
29 static double rdmult_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
30 static int segment_id[MAX_SEGMENTS] = { 5, 3, 1, 0, 2, 4, 6, 7 };
31
32 #define Q_RATIO(i) q_ratio[(i) - ENERGY_MIN]
33 #define RDMULT_RATIO(i) rdmult_ratio[(i) - ENERGY_MIN]
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
vp9_vaq_segment_id(int energy)38 unsigned int vp9_vaq_segment_id(int energy) {
39 ENERGY_IN_BOUNDS(energy);
40
41 return SEGMENT_ID(energy);
42 }
43
vp9_vaq_rdmult_ratio(int energy)44 double vp9_vaq_rdmult_ratio(int energy) {
45 ENERGY_IN_BOUNDS(energy);
46
47 vp9_clear_system_state();
48
49 return RDMULT_RATIO(energy);
50 }
51
vp9_vaq_inv_q_ratio(int energy)52 double vp9_vaq_inv_q_ratio(int energy) {
53 ENERGY_IN_BOUNDS(energy);
54
55 vp9_clear_system_state();
56
57 return Q_RATIO(-energy);
58 }
59
vp9_vaq_init()60 void vp9_vaq_init() {
61 int i;
62 double base_ratio;
63
64 assert(ENERGY_SPAN <= MAX_SEGMENTS);
65
66 vp9_clear_system_state();
67
68 base_ratio = 1.5;
69
70 for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {
71 Q_RATIO(i) = pow(base_ratio, i/3.0);
72 }
73 }
74
vp9_vaq_frame_setup(VP9_COMP * cpi)75 void vp9_vaq_frame_setup(VP9_COMP *cpi) {
76 VP9_COMMON *cm = &cpi->common;
77 struct segmentation *seg = &cm->seg;
78 const double base_q = vp9_convert_qindex_to_q(cm->base_qindex);
79 const int base_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex +
80 cm->y_dc_delta_q);
81 int i;
82
83 if (cm->frame_type == KEY_FRAME ||
84 cpi->refresh_alt_ref_frame ||
85 (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
86 vp9_enable_segmentation(seg);
87 vp9_clearall_segfeatures(seg);
88
89 seg->abs_delta = SEGMENT_DELTADATA;
90
91 vp9_clear_system_state();
92
93 for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {
94 int qindex_delta, segment_rdmult;
95
96 if (Q_RATIO(i) == 1) {
97 // No need to enable SEG_LVL_ALT_Q for this segment
98 RDMULT_RATIO(i) = 1;
99 continue;
100 }
101
102 qindex_delta = vp9_compute_qdelta(cpi, base_q, base_q * Q_RATIO(i));
103 vp9_set_segdata(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q, qindex_delta);
104 vp9_enable_segfeature(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q);
105
106 segment_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex + qindex_delta +
107 cm->y_dc_delta_q);
108
109 RDMULT_RATIO(i) = (double) segment_rdmult / base_rdmult;
110 }
111 }
112 }
113
114
block_variance(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)115 static unsigned int block_variance(VP9_COMP *cpi, MACROBLOCK *x,
116 BLOCK_SIZE bs) {
117 MACROBLOCKD *xd = &x->e_mbd;
118 unsigned int var, sse;
119 int right_overflow = (xd->mb_to_right_edge < 0) ?
120 ((-xd->mb_to_right_edge) >> 3) : 0;
121 int bottom_overflow = (xd->mb_to_bottom_edge < 0) ?
122 ((-xd->mb_to_bottom_edge) >> 3) : 0;
123
124 if (right_overflow || bottom_overflow) {
125 const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;
126 const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;
127 int avg;
128 variance(x->plane[0].src.buf, x->plane[0].src.stride,
129 vp9_64_zeros, 0, bw, bh, &sse, &avg);
130 var = sse - (((int64_t)avg * avg) / (bw * bh));
131 return (256 * var) / (bw * bh);
132 } else {
133 var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
134 x->plane[0].src.stride,
135 vp9_64_zeros, 0, &sse);
136 return (256 * var) >> num_pels_log2_lookup[bs];
137 }
138 }
139
vp9_block_energy(VP9_COMP * cpi,MACROBLOCK * x,BLOCK_SIZE bs)140 int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
141 double energy;
142 unsigned int var = block_variance(cpi, x, bs);
143
144 vp9_clear_system_state();
145
146 energy = 0.9 * (log(var + 1.0) - 10.0);
147 return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
148 }
149