txb_common.h 20.9 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
15
16
17

#define REDUCE_CONTEXT_DEPENDENCY 0
#define MIN_SCAN_IDX_REDUCE_CONTEXT_DEPENDENCY 0

Dake He's avatar
Dake He committed
18
19
20
21
22
23
24
#if CONFIG_EOB_FIRST
extern const int16_t k_eob_group_start[12];
extern const int16_t k_eob_offset_bits[12];
int16_t get_eob_pos_token(int eob, int16_t *extra);
int get_eob_pos_ctx(int eob_token);
#endif

25
extern const int16_t av1_coeff_band_4x4[16];
Angie Chiang's avatar
Angie Chiang committed
26

27
extern const int16_t av1_coeff_band_8x8[64];
Angie Chiang's avatar
Angie Chiang committed
28

29
30
31
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
32

33
34
35
36
37
typedef struct txb_ctx {
  int txb_skip_ctx;
  int dc_sign_ctx;
} TXB_CTX;

38
39
40
41
static INLINE TX_SIZE get_txsize_context(TX_SIZE tx_size) {
  return txsize_sqr_up_map[tx_size];
}

42
static const int base_ref_offset[BASE_CONTEXT_POSITION_NUM][2] = {
Angie Chiang's avatar
Angie Chiang committed
43
44
45
46
47
48
  /* 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*/
};

Linfeng Zhang's avatar
Linfeng Zhang committed
49
50
51
// TODO(linfengz): Some functions have coeff_is_byte_flag to handle different
// types of input coefficients. If possible, unify types to uint8_t* later.

Angie Chiang's avatar
Angie Chiang committed
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
static INLINE void get_base_count_mag(int *mag, int *count,
                                      const tran_low_t *tcoeffs, int bwl,
                                      int height, int row, int col) {
  mag[0] = 0;
  mag[1] = 0;
  for (int i = 0; i < NUM_BASE_LEVELS; ++i) count[i] = 0;
  for (int idx = 0; idx < BASE_CONTEXT_POSITION_NUM; ++idx) {
    const int ref_row = row + base_ref_offset[idx][0];
    const int ref_col = col + base_ref_offset[idx][1];
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl))
      continue;
    const int pos = (ref_row << bwl) + ref_col;
    tran_low_t abs_coeff = abs(tcoeffs[pos]);
    // count
    for (int i = 0; i < NUM_BASE_LEVELS; ++i) {
      count[i] += abs_coeff > i;
    }
    // mag
    if (base_ref_offset[idx][0] >= 0 && base_ref_offset[idx][1] >= 0) {
      if (abs_coeff > mag[0]) {
        mag[0] = abs_coeff;
        mag[1] = 1;
      } else if (abs_coeff == mag[0]) {
        ++mag[1];
      }
    }
  }
}

82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
static INLINE int get_level_count_mag(
    int *const mag, const uint8_t *const levels, const int bwl,
    const int height, const int row, const int col, const int level,
    const int (*nb_offset)[2], const int nb_num) {
  const int stride = 1 << bwl;
  int count = 0;
  *mag = 0;
  for (int idx = 0; idx < nb_num; ++idx) {
    const int ref_row = row + nb_offset[idx][0];
    const int ref_col = col + nb_offset[idx][1];
    if (ref_row < 0 || ref_col < 0 || ref_row >= height || ref_col >= stride)
      continue;
    const int pos = (ref_row << bwl) + ref_col;
    count += levels[pos] > level;
    if (nb_offset[idx][0] >= 0 && nb_offset[idx][1] >= 0)
      *mag = AOMMAX(*mag, levels[pos]);
  }
  return count;
}

static INLINE int get_level_count_mag_coeff(
    int *const mag, const tran_low_t *const tcoeffs, const int bwl,
    const int height, const int row, const int col, const int level,
    const int (*nb_offset)[2], const int nb_num) {
106
  const int stride = 1 << bwl;
Angie Chiang's avatar
Angie Chiang committed
107
108
109
  int count = 0;
  *mag = 0;
  for (int idx = 0; idx < nb_num; ++idx) {
110
111
    const int ref_row = row + nb_offset[idx][0];
    const int ref_col = col + nb_offset[idx][1];
112
    if (ref_row < 0 || ref_col < 0 || ref_row >= height || ref_col >= stride)
Angie Chiang's avatar
Angie Chiang committed
113
      continue;
Yaowu Xu's avatar
Yaowu Xu committed
114
    const int pos = (ref_row << bwl) + ref_col;
Angie Chiang's avatar
Angie Chiang committed
115
116
117
118
    tran_low_t abs_coeff = abs(tcoeffs[pos]);
    count += abs_coeff > level;
    if (nb_offset[idx][0] >= 0 && nb_offset[idx][1] >= 0)
      *mag = AOMMAX(*mag, abs_coeff);
Angie Chiang's avatar
Angie Chiang committed
119
  }
Angie Chiang's avatar
Angie Chiang committed
120
121
122
  return count;
}

123
static INLINE int get_base_ctx_from_count_mag(int row, int col, int count,
124
                                              int sig_mag) {
125
  const int ctx = (count + 1) >> 1;
Angie Chiang's avatar
Angie Chiang committed
126
  int ctx_idx = -1;
Angie Chiang's avatar
Angie Chiang committed
127
  if (row == 0 && col == 0) {
128
    ctx_idx = (ctx << 1) + sig_mag;
129
130
    // TODO(angiebird): turn this on once the optimization is finalized
    // assert(ctx_idx < 8);
Angie Chiang's avatar
Angie Chiang committed
131
  } else if (row == 0) {
132
    ctx_idx = 8 + (ctx << 1) + sig_mag;
133
134
    // TODO(angiebird): turn this on once the optimization is finalized
    // assert(ctx_idx < 18);
Angie Chiang's avatar
Angie Chiang committed
135
  } else if (col == 0) {
136
    ctx_idx = 8 + 10 + (ctx << 1) + sig_mag;
137
138
    // TODO(angiebird): turn this on once the optimization is finalized
    // assert(ctx_idx < 28);
Angie Chiang's avatar
Angie Chiang committed
139
  } else {
140
    ctx_idx = 8 + 10 + 10 + (ctx << 1) + sig_mag;
Angie Chiang's avatar
Angie Chiang committed
141
142
143
144
145
    assert(ctx_idx < COEFF_BASE_CONTEXTS);
  }
  return ctx_idx;
}

146
147
static INLINE int get_base_ctx(const uint8_t *const levels,
                               const int c,  // raster order
148
149
                               const int bwl, const int height,
                               const int level) {
150
151
152
153
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int level_minus_1 = level - 1;
  int mag;
154
155
  const int count =
      get_level_count_mag(&mag, levels, bwl, height, row, col, level_minus_1,
156
                          base_ref_offset, BASE_CONTEXT_POSITION_NUM);
157
  const int ctx_idx = get_base_ctx_from_count_mag(row, col, count, mag > level);
158
159
160
  return ctx_idx;
}

Angie Chiang's avatar
Angie Chiang committed
161
#define BR_CONTEXT_POSITION_NUM 8  // Base range coefficient context
Dake He's avatar
Dake He committed
162
#if CONFIG_EOB_FIRST
163
static const int br_ref_offset[BR_CONTEXT_POSITION_NUM][2] = {
Angie Chiang's avatar
Angie Chiang committed
164
165
166
167
168
  /* clang-format off*/
  { -1, -1 }, { -1, 0 }, { -1, 1 }, { 0, -1 },
  { 0, 1 },   { 1, -1 }, { 1, 0 },  { 1, 1 },
  /* clang-format on*/
};
Dake He's avatar
Dake He committed
169
170
171
172
173
174
175
176
#else
static const 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*/
};
#endif
Angie Chiang's avatar
Angie Chiang committed
177

178
static const int br_level_map[9] = {
Angie Chiang's avatar
Angie Chiang committed
179
180
181
  0, 0, 1, 1, 2, 2, 3, 3, 3,
};

182
183
184
185
186
187
188
189
190
191
192
193
static const int coeff_to_br_index[COEFF_BASE_RANGE] = {
  0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2,
};

static const int br_index_to_coeff[BASE_RANGE_SETS] = {
  0, 2, 6,
};

static const int br_extra_bits[BASE_RANGE_SETS] = {
  1, 2, 3,
};

194
195
196
#define BR_MAG_OFFSET 1
// TODO(angiebird): optimize this function by using a table to map from
// count/mag to ctx
Angie Chiang's avatar
Angie Chiang committed
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223

static INLINE int get_br_count_mag(int *mag, const tran_low_t *tcoeffs, int bwl,
                                   int height, int row, int col, int level) {
  mag[0] = 0;
  mag[1] = 0;
  int count = 0;
  for (int idx = 0; idx < BR_CONTEXT_POSITION_NUM; ++idx) {
    const int ref_row = row + br_ref_offset[idx][0];
    const int ref_col = col + br_ref_offset[idx][1];
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl))
      continue;
    const int pos = (ref_row << bwl) + ref_col;
    tran_low_t abs_coeff = abs(tcoeffs[pos]);
    count += abs_coeff > level;
    if (br_ref_offset[idx][0] >= 0 && br_ref_offset[idx][1] >= 0) {
      if (abs_coeff > mag[0]) {
        mag[0] = abs_coeff;
        mag[1] = 1;
      } else if (abs_coeff == mag[0]) {
        ++mag[1];
      }
    }
  }
  return count;
}

224
225
static INLINE int get_br_ctx_from_count_mag(int row, int col, int count,
                                            int mag) {
226
  int offset = 0;
227
  if (mag <= BR_MAG_OFFSET)
Angie Chiang's avatar
Angie Chiang committed
228
229
230
    offset = 0;
  else if (mag <= 3)
    offset = 1;
231
  else if (mag <= 5)
Angie Chiang's avatar
Angie Chiang committed
232
233
234
235
    offset = 2;
  else
    offset = 3;

236
  int ctx = br_level_map[count];
Angie Chiang's avatar
Angie Chiang committed
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
  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;
}

252
static INLINE int get_br_ctx(const uint8_t *const levels,
253
                             const int c,  // raster order
254
                             const int bwl, const int height) {
255
256
257
258
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int level_minus_1 = NUM_BASE_LEVELS;
  int mag;
259
  const int count =
260
      get_level_count_mag(&mag, levels, bwl, height, row, col, level_minus_1,
261
                          br_ref_offset, BR_CONTEXT_POSITION_NUM);
262
263
264
265
  const int ctx = get_br_ctx_from_count_mag(row, col, count, mag);
  return ctx;
}

266
267
268
269
270
271
272
273
274
275
276
277
278
279
static INLINE int get_br_ctx_coeff(const tran_low_t *const tcoeffs,
                                   const int c,  // raster order
                                   const int bwl, const int height) {
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int level_minus_1 = NUM_BASE_LEVELS;
  int mag;
  const int count = get_level_count_mag_coeff(&mag, tcoeffs, bwl, height, row,
                                              col, level_minus_1, br_ref_offset,
                                              BR_CONTEXT_POSITION_NUM);
  const int ctx = get_br_ctx_from_count_mag(row, col, count, mag);
  return ctx;
}

Angie Chiang's avatar
Angie Chiang committed
280
#define SIG_REF_OFFSET_NUM 7
Dake He's avatar
Dake He committed
281
#if CONFIG_EOB_FIRST
282
static const int sig_ref_offset[SIG_REF_OFFSET_NUM][2] = {
Dake He's avatar
Dake He committed
283
284
285
  { 2, 1 }, { 2, 0 }, { 1, 2 }, { 1, 1 }, { 1, 0 }, { 0, 2 }, { 0, 1 },
};

286
static const int sig_ref_offset_vert[SIG_REF_OFFSET_NUM][2] = {
Dake He's avatar
Dake He committed
287
288
289
  { 2, 1 }, { 2, 0 }, { 3, 0 }, { 1, 1 }, { 1, 0 }, { 4, 0 }, { 0, 1 },
};

290
static const int sig_ref_offset_horiz[SIG_REF_OFFSET_NUM][2] = {
Dake He's avatar
Dake He committed
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
  { 0, 3 }, { 0, 4 }, { 1, 2 }, { 1, 1 }, { 1, 0 }, { 0, 2 }, { 0, 1 },
};

static INLINE int get_nz_count(const tran_low_t *tcoeffs, int bwl, int height,
                               int row, int col, TX_CLASS tx_class,
                               const int coeff_is_byte_flag) {
  int count = 0;
  for (int idx = 0; idx < SIG_REF_OFFSET_NUM; ++idx) {
    const int ref_row = row + ((tx_class == TX_CLASS_2D)
                                   ? sig_ref_offset[idx][0]
                                   : ((tx_class == TX_CLASS_VERT)
                                          ? sig_ref_offset_vert[idx][0]
                                          : sig_ref_offset_horiz[idx][0]));
    const int ref_col = col + ((tx_class == TX_CLASS_2D)
                                   ? sig_ref_offset[idx][1]
                                   : ((tx_class == TX_CLASS_VERT)
                                          ? sig_ref_offset_vert[idx][1]
                                          : sig_ref_offset_horiz[idx][1]));
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl))
      continue;
    const int nb_pos = (ref_row << bwl) + ref_col;
    count +=
        ((coeff_is_byte_flag ? ((const uint8_t *)tcoeffs)[nb_pos]
                             : ((const tran_low_t *)tcoeffs)[nb_pos]) != 0);
  }
  return count;
}
#else
320
static const int sig_ref_offset[SIG_REF_OFFSET_NUM][2] = {
Angie Chiang's avatar
Angie Chiang committed
321
322
  { -2, -1 }, { -2, 0 }, { -1, -2 }, { -1, -1 },
  { -1, 0 },  { 0, -2 }, { 0, -1 },
Angie Chiang's avatar
Angie Chiang committed
323
324
};

325
#if REDUCE_CONTEXT_DEPENDENCY
Linfeng Zhang's avatar
Linfeng Zhang committed
326
327
328
329
static INLINE int get_nz_count(const void *const tcoeffs, const int bwl,
                               const int height, const int row, const int col,
                               const int coeff_is_byte_flag, const int prev_row,
                               const int prev_col) {
330
331
332
333
334
335
336
337
  int count = 0;
  for (int idx = 0; idx < SIG_REF_OFFSET_NUM; ++idx) {
    const int ref_row = row + sig_ref_offset[idx][0];
    const int ref_col = col + sig_ref_offset[idx][1];
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl) || (prev_row == ref_row && prev_col == ref_col))
      continue;
    const int nb_pos = (ref_row << bwl) + ref_col;
Linfeng Zhang's avatar
Linfeng Zhang committed
338
339
340
    count +=
        ((coeff_is_byte_flag ? ((const uint8_t *)tcoeffs)[nb_pos]
                             : ((const tran_low_t *)tcoeffs)[nb_pos]) != 0);
341
342
343
344
  }
  return count;
}
#else
Linfeng Zhang's avatar
Linfeng Zhang committed
345
346
347
static INLINE int get_nz_count(const void *const tcoeffs, const int bwl,
                               const int height, const int row, const int col,
                               const int coeff_is_byte_flag) {
348
349
350
351
  int count = 0;
  for (int idx = 0; idx < SIG_REF_OFFSET_NUM; ++idx) {
    const int ref_row = row + sig_ref_offset[idx][0];
    const int ref_col = col + sig_ref_offset[idx][1];
352
353
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl))
354
      continue;
355
    const int nb_pos = (ref_row << bwl) + ref_col;
Linfeng Zhang's avatar
Linfeng Zhang committed
356
357
358
    count +=
        ((coeff_is_byte_flag ? ((const uint8_t *)tcoeffs)[nb_pos]
                             : ((const tran_low_t *)tcoeffs)[nb_pos]) != 0);
359
360
361
  }
  return count;
}
362
#endif
363

Dake He's avatar
Dake He committed
364
365
#endif

366
367
368
369
370
371
372
373
374
375
376
377
378
379
static INLINE TX_CLASS get_tx_class(TX_TYPE tx_type) {
  switch (tx_type) {
#if CONFIG_EXT_TX
    case V_DCT:
    case V_ADST:
    case V_FLIPADST: return TX_CLASS_VERT;
    case H_DCT:
    case H_ADST:
    case H_FLIPADST: return TX_CLASS_HORIZ;
#endif
    default: return TX_CLASS_2D;
  }
}

380
381
382
383
// TODO(angiebird): optimize this function by generate a table that maps from
// count to ctx
static INLINE int get_nz_map_ctx_from_count(int count,
                                            int coeff_idx,  // raster order
Dake He's avatar
Dake He committed
384
385
386
387
388
                                            int bwl,
#if CONFIG_EOB_FIRST
                                            int height,
#endif
                                            TX_TYPE tx_type) {
389
  (void)tx_type;
390
391
392
  const int row = coeff_idx >> bwl;
  const int col = coeff_idx - (row << bwl);
  int ctx = 0;
393
394
395
396
397
398
399
400
401
402
403
404
#if CONFIG_EXT_TX
  int tx_class = get_tx_class(tx_type);
  int offset;
  if (tx_class == TX_CLASS_2D)
    offset = 0;
  else if (tx_class == TX_CLASS_VERT)
    offset = SIG_COEF_CONTEXTS_2D;
  else
    offset = SIG_COEF_CONTEXTS_2D + SIG_COEF_CONTEXTS_1D;
#else
  int offset = 0;
#endif
405

Dake He's avatar
Dake He committed
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
#if CONFIG_EOB_FIRST
  (void)height;
  ctx = (count + 1) >> 1;

  if (tx_class == TX_CLASS_2D) {
    {
      if (row == 0 && col == 0) return offset + 0;

      if (row + col < 2) return offset + ctx + 1;

      if (row + col < 4) return offset + 5 + ctx + 1;

      return offset + 11 + AOMMIN(ctx, 4);
    }
  } else {
    if (tx_class == TX_CLASS_VERT) {
      if (row == 0) return offset + ctx;
      if (row < 2) return offset + 5 + ctx;
      return offset + 10 + ctx;
    } else {
      if (col == 0) return offset + ctx;
      if (col < 2) return offset + 5 + ctx;
      return offset + 10 + ctx;
    }
  }
#else
432
  if (row == 0 && col == 0) return offset + 0;
433

Angie Chiang's avatar
Angie Chiang committed
434
  if (row == 0 && col == 1) return offset + 1 + count;
435

Angie Chiang's avatar
Angie Chiang committed
436
  if (row == 1 && col == 0) return offset + 3 + count;
437
438

  if (row == 1 && col == 1) {
Angie Chiang's avatar
Angie Chiang committed
439
    ctx = (count + 1) >> 1;
440
441
442

    assert(5 + ctx <= 7);

443
    return offset + 5 + ctx;
444
445
446
447
448
  }

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

Angie Chiang's avatar
Angie Chiang committed
449
    assert(ctx < 2);
450
    return offset + 8 + ctx;
451
452
453
454
455
  }

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

Angie Chiang's avatar
Angie Chiang committed
456
457
    assert(ctx < 2);
    return offset + 10 + ctx;
458
459
460
461
  }

  ctx = count >> 1;

Angie Chiang's avatar
Angie Chiang committed
462
  assert(12 + ctx < 16);
463

Angie Chiang's avatar
Angie Chiang committed
464
  return offset + 12 + ctx;
Dake He's avatar
Dake He committed
465
#endif
466
467
}

Linfeng Zhang's avatar
Linfeng Zhang committed
468
469
470
471
static INLINE int get_nz_map_ctx(const void *const tcoeffs, const int scan_idx,
                                 const int16_t *const scan, const int bwl,
                                 const int height, const TX_TYPE tx_type,
                                 const int coeff_is_byte_flag) {
472
  const int coeff_idx = scan[scan_idx];
473
474
  const int row = coeff_idx >> bwl;
  const int col = coeff_idx - (row << bwl);
475
476
477
478
479
480
481
482
483
484
485
486
487
#if REDUCE_CONTEXT_DEPENDENCY
  int prev_coeff_idx;
  int prev_row;
  int prev_col;
  if (scan_idx > MIN_SCAN_IDX_REDUCE_CONTEXT_DEPENDENCY) {
    prev_coeff_idx = scan[scan_idx - 1];  // raster order
    prev_row = prev_coeff_idx >> bwl;
    prev_col = prev_coeff_idx - (prev_row << bwl);
  } else {
    prev_coeff_idx = -1;
    prev_row = -1;
    prev_col = -1;
  }
Linfeng Zhang's avatar
Linfeng Zhang committed
488
489
  const int count = get_nz_count(tcoeffs, bwl, height, row, col,
                                 coeff_is_byte_flag, prev_row, prev_col);
490
#else
Dake He's avatar
Dake He committed
491
492
493
494
495
496
497
498
499
500
501
#if CONFIG_EOB_FIRST
  int tx_class = get_tx_class(tx_type);
  int count = get_nz_count(tcoeffs, bwl, height, row, col, tx_class,
                           coeff_is_byte_flag);
#else
  int count = get_nz_count(tcoeffs, bwl, height, row, col, coeff_is_byte_flag);
#endif
#endif
  return get_nz_map_ctx_from_count(count, coeff_idx, bwl,
#if CONFIG_EOB_FIRST
                                   height,
502
#endif
Dake He's avatar
Dake He committed
503
                                   tx_type);
504
505
}

Linfeng Zhang's avatar
Linfeng Zhang committed
506
507
static INLINE int get_eob_ctx(const int coeff_idx,  // raster order
                              const TX_SIZE txs_ctx, const TX_TYPE tx_type) {
508
509
  int offset = 0;
#if CONFIG_CTX1D
Linfeng Zhang's avatar
Linfeng Zhang committed
510
  const TX_CLASS tx_class = get_tx_class(tx_type);
511
512
513
514
515
  if (tx_class == TX_CLASS_VERT)
    offset = EOB_COEF_CONTEXTS_2D;
  else if (tx_class == TX_CLASS_HORIZ)
    offset = EOB_COEF_CONTEXTS_2D + EOB_COEF_CONTEXTS_1D;
#else
Angie Chiang's avatar
Angie Chiang committed
516
  (void)tx_type;
517
518
519
520
521
522
#endif

  if (txs_ctx == TX_4X4) return offset + av1_coeff_band_4x4[coeff_idx];
  if (txs_ctx == TX_8X8) return offset + av1_coeff_band_8x8[coeff_idx];
  if (txs_ctx == TX_16X16) return offset + av1_coeff_band_16x16[coeff_idx];
  if (txs_ctx == TX_32X32) return offset + av1_coeff_band_32x32[coeff_idx];
Angie Chiang's avatar
Angie Chiang committed
523

524
525
  assert(0);
  return 0;
Angie Chiang's avatar
Angie Chiang committed
526
527
}

528
529
530
531
532
533
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
534
535
536
537
538
539
540
541
542
543
544

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;
}

545
546
static INLINE void get_txb_ctx(BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
                               int plane, const ENTROPY_CONTEXT *a,
547
                               const ENTROPY_CONTEXT *l, TXB_CTX *txb_ctx) {
548
549
  const int txb_w_unit = tx_size_wide_unit[tx_size];
  const int txb_h_unit = tx_size_high_unit[tx_size];
Angie Chiang's avatar
Angie Chiang committed
550
551
  int ctx_offset = (plane == 0) ? 0 : 7;

552
  if (plane_bsize > txsize_to_bsize[tx_size]) ctx_offset += 3;
Angie Chiang's avatar
Angie Chiang committed
553

554
  int dc_sign = 0;
555
  for (int k = 0; k < txb_w_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
556
    int sign = ((uint8_t)a[k]) >> COEFF_CONTEXT_BITS;
Angie Chiang's avatar
Angie Chiang committed
557
    if (sign == 1)
558
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
559
    else if (sign == 2)
560
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
561
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
562
      assert(0);
563
  }
Angie Chiang's avatar
Angie Chiang committed
564

565
566
  for (int k = 0; k < txb_h_unit; ++k) {
    int sign = ((uint8_t)l[k]) >> COEFF_CONTEXT_BITS;
Angie Chiang's avatar
Angie Chiang committed
567
    if (sign == 1)
568
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
569
    else if (sign == 2)
570
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
571
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
572
      assert(0);
Angie Chiang's avatar
Angie Chiang committed
573
  }
574

575
  txb_ctx->dc_sign_ctx = get_dc_sign_ctx(dc_sign);
Angie Chiang's avatar
Angie Chiang committed
576
577
578
579

  if (plane == 0) {
    int top = 0;
    int left = 0;
580
581

    for (int k = 0; k < txb_w_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
582
      top = AOMMAX(top, ((uint8_t)a[k] & COEFF_CONTEXT_MASK));
583
584
585
    }

    for (int k = 0; k < txb_h_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
586
      left = AOMMAX(left, ((uint8_t)l[k] & COEFF_CONTEXT_MASK));
Angie Chiang's avatar
Angie Chiang committed
587
    }
588

Angie Chiang's avatar
Angie Chiang committed
589
590
591
    top = AOMMIN(top, 255);
    left = AOMMIN(left, 255);

592
    if (plane_bsize == txsize_to_bsize[tx_size])
593
      txb_ctx->txb_skip_ctx = 0;
Angie Chiang's avatar
Angie Chiang committed
594
    else if (top == 0 && left == 0)
595
      txb_ctx->txb_skip_ctx = 1;
Angie Chiang's avatar
Angie Chiang committed
596
    else if (top == 0 || left == 0)
597
      txb_ctx->txb_skip_ctx = 2 + (AOMMAX(top, left) > 3);
Angie Chiang's avatar
Angie Chiang committed
598
    else if (AOMMAX(top, left) <= 3)
599
      txb_ctx->txb_skip_ctx = 4;
Angie Chiang's avatar
Angie Chiang committed
600
    else if (AOMMIN(top, left) <= 3)
601
      txb_ctx->txb_skip_ctx = 5;
Angie Chiang's avatar
Angie Chiang committed
602
    else
603
      txb_ctx->txb_skip_ctx = 6;
Angie Chiang's avatar
Angie Chiang committed
604
605
  } else {
    int ctx_base = get_entropy_context(tx_size, a, l);
606
    txb_ctx->txb_skip_ctx = ctx_offset + ctx_base;
Angie Chiang's avatar
Angie Chiang committed
607
608
  }
}
Angie Chiang's avatar
Angie Chiang committed
609

610
611
612
613
#if LV_MAP_PROB
void av1_init_txb_probs(FRAME_CONTEXT *fc);
#endif  // LV_MAP_PROB

Angie Chiang's avatar
Angie Chiang committed
614
615
void av1_adapt_txb_probs(AV1_COMMON *cm, unsigned int count_sat,
                         unsigned int update_factor);
616
617

void av1_init_lv_map(AV1_COMMON *cm);
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665

#if CONFIG_CTX1D
static INLINE void get_eob_vert(int16_t *eob_ls, const tran_low_t *tcoeff,
                                int w, int h) {
  for (int c = 0; c < w; ++c) {
    eob_ls[c] = 0;
    for (int r = h - 1; r >= 0; --r) {
      int coeff_idx = r * w + c;
      if (tcoeff[coeff_idx] != 0) {
        eob_ls[c] = r + 1;
        break;
      }
    }
  }
}

static INLINE void get_eob_horiz(int16_t *eob_ls, const tran_low_t *tcoeff,
                                 int w, int h) {
  for (int r = 0; r < h; ++r) {
    eob_ls[r] = 0;
    for (int c = w - 1; c >= 0; --c) {
      int coeff_idx = r * w + c;
      if (tcoeff[coeff_idx] != 0) {
        eob_ls[r] = c + 1;
        break;
      }
    }
  }
}

static INLINE int get_empty_line_ctx(int line_idx, int16_t *eob_ls) {
  if (line_idx > 0) {
    int prev_eob = eob_ls[line_idx - 1];
    if (prev_eob == 0) {
      return 1;
    } else if (prev_eob < 3) {
      return 2;
    } else if (prev_eob < 6) {
      return 3;
    } else {
      return 4;
    }
  } else {
    return 0;
  }
}

#define MAX_POS_CTX 8
666
static const int pos_ctx[MAX_HVTX_SIZE] = {
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5,
  6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7,
};
static INLINE int get_hv_eob_ctx(int line_idx, int pos, int16_t *eob_ls) {
  if (line_idx > 0) {
    int prev_eob = eob_ls[line_idx - 1];
    int diff = pos + 1 - prev_eob;
    int abs_diff = abs(diff);
    int ctx_idx = pos_ctx[abs_diff];
    assert(ctx_idx < MAX_POS_CTX);
    if (diff < 0) {
      ctx_idx += MAX_POS_CTX;
      assert(ctx_idx >= MAX_POS_CTX);
      assert(ctx_idx < 2 * MAX_POS_CTX);
    }
    return ctx_idx;
  } else {
    int ctx_idx = MAX_POS_CTX + MAX_POS_CTX + pos_ctx[pos];
    assert(ctx_idx < HV_EOB_CONTEXTS);
    assert(HV_EOB_CONTEXTS == MAX_POS_CTX * 3);
    return ctx_idx;
  }
}
#endif  // CONFIG_CTX1D

Angie Chiang's avatar
Angie Chiang committed
692
#endif  // AV1_COMMON_TXB_COMMON_H_