aq_variance.c 6.7 KB
Newer Older
Jingning Han's avatar
Jingning Han committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
/*
 *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <math.h>

#include "vpx_ports/mem.h"

15
#include "vp10/encoder/aq_variance.h"
Jingning Han's avatar
Jingning Han committed
16

17
18
19
20
#include "vp10/common/seg_common.h"
#include "vp10/encoder/ratectrl.h"
#include "vp10/encoder/rd.h"
#include "vp10/encoder/segmentation.h"
21
#include "vpx_ports/system_state.h"
Jingning Han's avatar
Jingning Han committed
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

#define ENERGY_MIN (-4)
#define ENERGY_MAX (1)
#define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN +  1)
#define ENERGY_IN_BOUNDS(energy)\
  assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)

static const double rate_ratio[MAX_SEGMENTS] =
  {2.5, 2.0, 1.5, 1.0, 0.75, 1.0, 1.0, 1.0};
static const int segment_id[ENERGY_SPAN] = {0, 1, 1, 2, 3, 4};

#define SEGMENT_ID(i) segment_id[(i) - ENERGY_MIN]

DECLARE_ALIGNED(16, static const uint8_t, vp10_64_zeros[64]) = {0};
#if CONFIG_VP9_HIGHBITDEPTH
DECLARE_ALIGNED(16, static const uint16_t, vp10_highbd_64_zeros[64]) = {0};
#endif

unsigned int vp10_vaq_segment_id(int energy) {
  ENERGY_IN_BOUNDS(energy);
  return SEGMENT_ID(energy);
}

Yaowu Xu's avatar
Yaowu Xu committed
45
void vp10_vaq_frame_setup(VP10_COMP *cpi) {
Yaowu Xu's avatar
Yaowu Xu committed
46
  VP10_COMMON *cm = &cpi->common;
Jingning Han's avatar
Jingning Han committed
47
48
49
  struct segmentation *seg = &cm->seg;
  int i;

50
  if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
Jingning Han's avatar
Jingning Han committed
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
      cpi->refresh_alt_ref_frame ||
      (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
    vp10_enable_segmentation(seg);
    vp10_clearall_segfeatures(seg);

    seg->abs_delta = SEGMENT_DELTADATA;

    vpx_clear_system_state();

    for (i = 0; i < MAX_SEGMENTS; ++i) {
      int qindex_delta =
          vp10_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
                                     rate_ratio[i], cm->bit_depth);

      // We don't allow qindex 0 in a segment if the base value is not 0.
      // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
      // Q delta is sometimes applied without going back around the rd loop.
      // This could lead to an illegal combination of partition size and q.
      if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
        qindex_delta = -cm->base_qindex + 1;
      }

      // No need to enable SEG_LVL_ALT_Q for this segment.
      if (rate_ratio[i] == 1.0) {
        continue;
      }

      vp10_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
      vp10_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
    }
  }
}

/* TODO(agrange, paulwilkins): The block_variance calls the unoptimized versions
 * of variance() and highbd_8_variance(). It should not.
 */
static void 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) {
  int i, j;

  *sum = 0;
  *sse = 0;

  for (i = 0; i < h; i++) {
    for (j = 0; j < w; j++) {
      const int diff = a[j] - b[j];
      *sum += diff;
      *sse += diff * diff;
    }

    a += a_stride;
    b += b_stride;
  }
}

#if CONFIG_VP9_HIGHBITDEPTH
static void 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) {
  int i, j;

  uint16_t *a = CONVERT_TO_SHORTPTR(a8);
  uint16_t *b = CONVERT_TO_SHORTPTR(b8);
  *sum = 0;
  *sse = 0;

  for (i = 0; i < h; i++) {
    for (j = 0; j < w; j++) {
      const int diff = a[j] - b[j];
      *sum += diff;
      *sse += diff * diff;
    }
    a += a_stride;
    b += b_stride;
  }
}

static void 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) {
  uint64_t sse_long = 0;
  uint64_t sum_long = 0;
  aq_highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
  *sse = (unsigned int)sse_long;
  *sum = (int)sum_long;
}
#endif  // CONFIG_VP9_HIGHBITDEPTH

Yaowu Xu's avatar
Yaowu Xu committed
140
static unsigned int block_variance(VP10_COMP *cpi, MACROBLOCK *x,
Jingning Han's avatar
Jingning Han committed
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
                                   BLOCK_SIZE bs) {
  MACROBLOCKD *xd = &x->e_mbd;
  unsigned int var, sse;
  int right_overflow = (xd->mb_to_right_edge < 0) ?
      ((-xd->mb_to_right_edge) >> 3) : 0;
  int bottom_overflow = (xd->mb_to_bottom_edge < 0) ?
      ((-xd->mb_to_bottom_edge) >> 3) : 0;

  if (right_overflow || bottom_overflow) {
    const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;
    const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;
    int avg;
#if CONFIG_VP9_HIGHBITDEPTH
    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
      aq_highbd_8_variance(x->plane[0].src.buf, x->plane[0].src.stride,
                           CONVERT_TO_BYTEPTR(vp10_highbd_64_zeros), 0, bw, bh,
                           &sse, &avg);
      sse >>= 2 * (xd->bd - 8);
      avg >>= (xd->bd - 8);
    } else {
      aq_variance(x->plane[0].src.buf, x->plane[0].src.stride,
                  vp10_64_zeros, 0, bw, bh, &sse, &avg);
    }
#else
    aq_variance(x->plane[0].src.buf, x->plane[0].src.stride,
                vp10_64_zeros, 0, bw, bh, &sse, &avg);
#endif  // CONFIG_VP9_HIGHBITDEPTH
    var = sse - (((int64_t)avg * avg) / (bw * bh));
    return (256 * var) / (bw * bh);
  } else {
#if CONFIG_VP9_HIGHBITDEPTH
    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
      var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
                               x->plane[0].src.stride,
                               CONVERT_TO_BYTEPTR(vp10_highbd_64_zeros),
                               0, &sse);
    } else {
      var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
                               x->plane[0].src.stride,
                               vp10_64_zeros, 0, &sse);
    }
#else
    var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
                             x->plane[0].src.stride,
                             vp10_64_zeros, 0, &sse);
#endif  // CONFIG_VP9_HIGHBITDEPTH
    return (256 * var) >> num_pels_log2_lookup[bs];
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
191
double vp10_log_block_var(VP10_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
Jingning Han's avatar
Jingning Han committed
192
193
194
195
196
197
  unsigned int var = block_variance(cpi, x, bs);
  vpx_clear_system_state();
  return log(var + 1.0);
}

#define DEFAULT_E_MIDPOINT 10.0
Yaowu Xu's avatar
Yaowu Xu committed
198
int vp10_block_energy(VP10_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
Jingning Han's avatar
Jingning Han committed
199
200
201
202
203
204
205
206
  double energy;
  double energy_midpoint;
  vpx_clear_system_state();
  energy_midpoint =
    (cpi->oxcf.pass == 2) ? cpi->twopass.mb_av_energy : DEFAULT_E_MIDPOINT;
  energy = vp10_log_block_var(cpi, x, bs) - energy_midpoint;
  return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
}