txb_common.h 7.96 KB
Newer Older
Angie Chiang's avatar
Angie Chiang committed
1
2
3
4
5
6
7
8
9
10
11
12
13
/*
 * Copyright (c) 2017, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#ifndef AV1_COMMON_TXB_COMMON_H_
#define AV1_COMMON_TXB_COMMON_H_
14
extern const int16_t av1_coeff_band_4x4[16];
Angie Chiang's avatar
Angie Chiang committed
15

16
extern const int16_t av1_coeff_band_8x8[64];
Angie Chiang's avatar
Angie Chiang committed
17

18
19
20
extern const int16_t av1_coeff_band_16x16[256];

extern const int16_t av1_coeff_band_32x32[1024];
Angie Chiang's avatar
Angie Chiang committed
21

22
23
24
25
26
typedef struct txb_ctx {
  int txb_skip_ctx;
  int dc_sign_ctx;
} TXB_CTX;

Angie Chiang's avatar
Angie Chiang committed
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
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
140
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
#define BASE_CONTEXT_POSITION_NUM 12
static int base_ref_offset[BASE_CONTEXT_POSITION_NUM][2] = {
  /* clang-format off*/
  { -2, 0 }, { -1, -1 }, { -1, 0 }, { -1, 1 }, { 0, -2 }, { 0, -1 }, { 0, 1 },
  { 0, 2 },  { 1, -1 },  { 1, 0 },  { 1, 1 },  { 2, 0 }
  /* clang-format on*/
};

static INLINE int get_base_ctx(const tran_low_t *tcoeffs,
                               int c,  // raster order
                               const int bwl, const int level) {
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int stride = 1 << bwl;
  const int level_minus_1 = level - 1;
  int ctx = 0;
  int mag = 0;
  int idx;
  int ctx_idx = -1;
  tran_low_t abs_coeff;

  ctx = 0;
  for (idx = 0; idx < BASE_CONTEXT_POSITION_NUM; ++idx) {
    int ref_row = row + base_ref_offset[idx][0];
    int ref_col = col + base_ref_offset[idx][1];
    int pos = (ref_row << bwl) + ref_col;

    if (ref_row < 0 || ref_col < 0 || ref_row >= stride || ref_col >= stride)
      continue;

    abs_coeff = abs(tcoeffs[pos]);
    ctx += abs_coeff > level_minus_1;

    if (base_ref_offset[idx][0] >= 0 && base_ref_offset[idx][1] >= 0)
      mag |= abs_coeff > level;
  }
  ctx = (ctx + 1) >> 1;
  if (row == 0 && col == 0) {
    ctx_idx = (ctx << 1) + mag;
    assert(ctx_idx < 8);
  } else if (row == 0) {
    ctx_idx = 8 + (ctx << 1) + mag;
    assert(ctx_idx < 18);
  } else if (col == 0) {
    ctx_idx = 8 + 10 + (ctx << 1) + mag;
    assert(ctx_idx < 28);
  } else {
    ctx_idx = 8 + 10 + 10 + (ctx << 1) + mag;
    assert(ctx_idx < COEFF_BASE_CONTEXTS);
  }
  return ctx_idx;
}

#define BR_CONTEXT_POSITION_NUM 8  // Base range coefficient context
static int br_ref_offset[BR_CONTEXT_POSITION_NUM][2] = {
  /* clang-format off*/
  { -1, -1 }, { -1, 0 }, { -1, 1 }, { 0, -1 },
  { 0, 1 },   { 1, -1 }, { 1, 0 },  { 1, 1 },
  /* clang-format on*/
};

static int br_level_map[9] = {
  0, 0, 1, 1, 2, 2, 3, 3, 3,
};

static INLINE int get_level_ctx(const tran_low_t *tcoeffs,
                                const int c,  // raster order
                                const int bwl) {
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int stride = 1 << bwl;
  const int level_minus_1 = NUM_BASE_LEVELS;
  int ctx = 0;
  int idx;
  tran_low_t abs_coeff;
  int mag = 0, offset = 0;

  for (idx = 0; idx < BR_CONTEXT_POSITION_NUM; ++idx) {
    int ref_row = row + br_ref_offset[idx][0];
    int ref_col = col + br_ref_offset[idx][1];
    int pos = (ref_row << bwl) + ref_col;

    if (ref_row < 0 || ref_col < 0 || ref_row >= stride || ref_col >= stride)
      continue;

    abs_coeff = abs(tcoeffs[pos]);
    ctx += abs_coeff > level_minus_1;

    if (br_ref_offset[idx][0] >= 0 && br_ref_offset[idx][1] >= 0)
      mag = AOMMAX(mag, abs_coeff);
  }

  if (mag <= 1)
    offset = 0;
  else if (mag <= 3)
    offset = 1;
  else if (mag <= 6)
    offset = 2;
  else
    offset = 3;

  ctx = br_level_map[ctx];

  ctx += offset * BR_TMP_OFFSET;

  // DC: 0 - 1
  if (row == 0 && col == 0) return ctx;

  // Top row: 2 - 4
  if (row == 0) return 2 + ctx;

  // Left column: 5 - 7
  if (col == 0) return 5 + ctx;

  // others: 8 - 11
  return 8 + ctx;
}

static int sig_ref_offset[11][2] = {
  { -2, -1 }, { -2, 0 }, { -2, 1 }, { -1, -2 }, { -1, -1 }, { -1, 0 },
  { -1, 1 },  { 0, -2 }, { 0, -1 }, { 1, -2 },  { 1, -1 },
};

static INLINE int get_nz_map_ctx(const tran_low_t *tcoeffs,
                                 const uint8_t *txb_mask,
                                 const int c,  // raster order
                                 const int bwl) {
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  int ctx = 0;
  int idx;
  int stride = 1 << bwl;

  if (row == 0 && col == 0) return 0;

  if (row == 0 && col == 1) return 1 + (tcoeffs[0] != 0);

  if (row == 1 && col == 0) return 3 + (tcoeffs[0] != 0);

  if (row == 1 && col == 1) {
    int pos;
    ctx = (tcoeffs[0] != 0);

    if (txb_mask[1]) ctx += (tcoeffs[1] != 0);
    pos = 1 << bwl;
    if (txb_mask[pos]) ctx += (tcoeffs[pos] != 0);

    ctx = (ctx + 1) >> 1;

176
    assert(5 + ctx <= 7);
Angie Chiang's avatar
Angie Chiang committed
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196

    return 5 + ctx;
  }

  for (idx = 0; idx < 11; ++idx) {
    int ref_row = row + sig_ref_offset[idx][0];
    int ref_col = col + sig_ref_offset[idx][1];
    int pos;

    if (ref_row < 0 || ref_col < 0 || ref_row >= stride || ref_col >= stride)
      continue;

    pos = (ref_row << bwl) + ref_col;

    if (txb_mask[pos]) ctx += (tcoeffs[pos] != 0);
  }

  if (row == 0) {
    ctx = (ctx + 1) >> 1;

197
    assert(ctx < 3);
Angie Chiang's avatar
Angie Chiang committed
198
199
200
201
202
203
    return 8 + ctx;
  }

  if (col == 0) {
    ctx = (ctx + 1) >> 1;

204
    assert(ctx < 3);
Angie Chiang's avatar
Angie Chiang committed
205
206
207
208
209
    return 11 + ctx;
  }

  ctx >>= 1;

210
  assert(14 + ctx < 20);
Angie Chiang's avatar
Angie Chiang committed
211
212
213
214
215
216
217
218

  return 14 + ctx;
}

static INLINE int get_eob_ctx(const tran_low_t *tcoeffs,
                              const int c,  // raster order
                              const int bwl) {
  (void)tcoeffs;
219
220
221
222
  if (bwl == 2) return av1_coeff_band_4x4[c];
  if (bwl == 3) return av1_coeff_band_8x8[c];
  if (bwl == 4) return av1_coeff_band_16x16[c];
  if (bwl == 5) return av1_coeff_band_32x32[c];
Angie Chiang's avatar
Angie Chiang committed
223

224
225
  assert(0);
  return 0;
Angie Chiang's avatar
Angie Chiang committed
226
227
}

228
229
230
231
232
233
static INLINE void set_dc_sign(int *cul_level, tran_low_t v) {
  if (v < 0)
    *cul_level |= 1 << COEFF_CONTEXT_BITS;
  else if (v > 0)
    *cul_level += 2 << COEFF_CONTEXT_BITS;
}
Angie Chiang's avatar
Angie Chiang committed
234
235
236
237
238
239
240
241
242
243
244

static INLINE int get_dc_sign_ctx(int dc_sign) {
  int dc_sign_ctx = 0;
  if (dc_sign < 0)
    dc_sign_ctx = 1;
  else if (dc_sign > 0)
    dc_sign_ctx = 2;

  return dc_sign_ctx;
}

245
246
247
static INLINE void get_txb_ctx(BLOCK_SIZE bsize, TX_SIZE tx_size, int plane,
                               const ENTROPY_CONTEXT *a,
                               const ENTROPY_CONTEXT *l, TXB_CTX *txb_ctx) {
Angie Chiang's avatar
Angie Chiang committed
248
249
250
251
252
253
  const int tx_size_in_blocks = 1 << tx_size;
  int ctx_offset = (plane == 0) ? 0 : 7;
  int k;

  if (bsize > txsize_to_bsize[tx_size]) ctx_offset += 3;

254
  int dc_sign = 0;
Angie Chiang's avatar
Angie Chiang committed
255
  for (k = 0; k < tx_size_in_blocks; ++k) {
Angie Chiang's avatar
Angie Chiang committed
256
    int sign = ((uint8_t)a[k]) >> COEFF_CONTEXT_BITS;
Angie Chiang's avatar
Angie Chiang committed
257
    if (sign == 1)
258
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
259
    else if (sign == 2)
260
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
261
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
262
      assert(0);
Angie Chiang's avatar
Angie Chiang committed
263

Angie Chiang's avatar
Angie Chiang committed
264
    sign = ((uint8_t)l[k]) >> COEFF_CONTEXT_BITS;
Angie Chiang's avatar
Angie Chiang committed
265
    if (sign == 1)
266
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
267
    else if (sign == 2)
268
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
269
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
270
      assert(0);
Angie Chiang's avatar
Angie Chiang committed
271
  }
272
  txb_ctx->dc_sign_ctx = get_dc_sign_ctx(dc_sign);
Angie Chiang's avatar
Angie Chiang committed
273
274
275
276
277

  if (plane == 0) {
    int top = 0;
    int left = 0;
    for (k = 0; k < tx_size_in_blocks; ++k) {
Angie Chiang's avatar
Angie Chiang committed
278
279
      top = AOMMAX(top, ((uint8_t)a[k] & COEFF_CONTEXT_MASK));
      left = AOMMAX(left, ((uint8_t)l[k] & COEFF_CONTEXT_MASK));
Angie Chiang's avatar
Angie Chiang committed
280
281
282
283
284
    }
    top = AOMMIN(top, 255);
    left = AOMMIN(left, 255);

    if (bsize == txsize_to_bsize[tx_size])
285
      txb_ctx->txb_skip_ctx = 0;
Angie Chiang's avatar
Angie Chiang committed
286
    else if (top == 0 && left == 0)
287
      txb_ctx->txb_skip_ctx = 1;
Angie Chiang's avatar
Angie Chiang committed
288
    else if (top == 0 || left == 0)
289
      txb_ctx->txb_skip_ctx = 2 + (AOMMAX(top, left) > 3);
Angie Chiang's avatar
Angie Chiang committed
290
    else if (AOMMAX(top, left) <= 3)
291
      txb_ctx->txb_skip_ctx = 4;
Angie Chiang's avatar
Angie Chiang committed
292
    else if (AOMMIN(top, left) <= 3)
293
      txb_ctx->txb_skip_ctx = 5;
Angie Chiang's avatar
Angie Chiang committed
294
    else
295
      txb_ctx->txb_skip_ctx = 6;
Angie Chiang's avatar
Angie Chiang committed
296
297
  } else {
    int ctx_base = get_entropy_context(tx_size, a, l);
298
    txb_ctx->txb_skip_ctx = ctx_offset + ctx_base;
Angie Chiang's avatar
Angie Chiang committed
299
300
  }
}
Angie Chiang's avatar
Angie Chiang committed
301
302
303

void av1_adapt_txb_probs(AV1_COMMON *cm, unsigned int count_sat,
                         unsigned int update_factor);
Angie Chiang's avatar
Angie Chiang committed
304
#endif  // AV1_COMMON_TXB_COMMON_H_