txb_common.h 13.6 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;

27 28 29 30
static INLINE TX_SIZE get_txsize_context(TX_SIZE tx_size) {
  return txsize_sqr_up_map[tx_size];
}

Angie Chiang's avatar
Angie Chiang committed
31 32 33 34 35 36 37
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*/
};

38
static INLINE int get_level_count(const tran_low_t *tcoeffs, int bwl,
39
                                  int height, int row, int col, int level,
40 41 42 43 44
                                  int (*nb_offset)[2], int nb_num) {
  int count = 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];
45 46
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl))
47
      continue;
48
    const int pos = (ref_row << bwl) + ref_col;
49 50 51 52 53 54
    tran_low_t abs_coeff = abs(tcoeffs[pos]);
    count += abs_coeff > level;
  }
  return count;
}

55
static INLINE void get_mag(int *mag, const tran_low_t *tcoeffs, int bwl,
56 57
                           int height, int row, int col, int (*nb_offset)[2],
                           int nb_num) {
58 59 60 61 62
  mag[0] = 0;
  mag[1] = 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];
63 64
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl))
65
      continue;
66
    const int pos = (ref_row << bwl) + ref_col;
67 68 69 70 71 72 73 74 75 76 77
    tran_low_t abs_coeff = abs(tcoeffs[pos]);
    if (nb_offset[idx][0] >= 0 && nb_offset[idx][1] >= 0) {
      if (abs_coeff > mag[0]) {
        mag[0] = abs_coeff;
        mag[1] = 1;
      } else if (abs_coeff == mag[0]) {
        ++mag[1];
      }
    }
  }
}
Angie Chiang's avatar
Angie Chiang committed
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

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];
      }
    }
  }
}

Angie Chiang's avatar
Angie Chiang committed
109
static INLINE int get_level_count_mag(int *mag, const tran_low_t *tcoeffs,
110
                                      int bwl, int height, int row, int col,
111 112
                                      int level, int (*nb_offset)[2],
                                      int nb_num) {
113
  const int stride = 1 << bwl;
Angie Chiang's avatar
Angie Chiang committed
114 115 116
  int count = 0;
  *mag = 0;
  for (int idx = 0; idx < nb_num; ++idx) {
117 118
    const int ref_row = row + nb_offset[idx][0];
    const int ref_col = col + nb_offset[idx][1];
119
    if (ref_row < 0 || ref_col < 0 || ref_row >= height || ref_col >= stride)
Angie Chiang's avatar
Angie Chiang committed
120
      continue;
Yaowu Xu's avatar
Yaowu Xu committed
121
    const int pos = (ref_row << bwl) + ref_col;
Angie Chiang's avatar
Angie Chiang committed
122 123 124 125
    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
126
  }
Angie Chiang's avatar
Angie Chiang committed
127 128 129
  return count;
}

130
static INLINE int get_base_ctx_from_count_mag(int row, int col, int count,
131
                                              int sig_mag) {
132
  const int ctx = (count + 1) >> 1;
Angie Chiang's avatar
Angie Chiang committed
133
  int ctx_idx = -1;
Angie Chiang's avatar
Angie Chiang committed
134
  if (row == 0 && col == 0) {
135
    ctx_idx = (ctx << 1) + sig_mag;
136 137
    // TODO(angiebird): turn this on once the optimization is finalized
    // assert(ctx_idx < 8);
Angie Chiang's avatar
Angie Chiang committed
138
  } else if (row == 0) {
139
    ctx_idx = 8 + (ctx << 1) + sig_mag;
140 141
    // TODO(angiebird): turn this on once the optimization is finalized
    // assert(ctx_idx < 18);
Angie Chiang's avatar
Angie Chiang committed
142
  } else if (col == 0) {
143
    ctx_idx = 8 + 10 + (ctx << 1) + sig_mag;
144 145
    // TODO(angiebird): turn this on once the optimization is finalized
    // assert(ctx_idx < 28);
Angie Chiang's avatar
Angie Chiang committed
146
  } else {
147
    ctx_idx = 8 + 10 + 10 + (ctx << 1) + sig_mag;
Angie Chiang's avatar
Angie Chiang committed
148 149 150 151 152
    assert(ctx_idx < COEFF_BASE_CONTEXTS);
  }
  return ctx_idx;
}

153 154
static INLINE int get_base_ctx(const tran_low_t *tcoeffs,
                               int c,  // raster order
155 156
                               const int bwl, const int height,
                               const int level) {
157 158 159 160
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int level_minus_1 = level - 1;
  int mag;
161 162 163
  int count =
      get_level_count_mag(&mag, tcoeffs, bwl, height, row, col, level_minus_1,
                          base_ref_offset, BASE_CONTEXT_POSITION_NUM);
164
  int ctx_idx = get_base_ctx_from_count_mag(row, col, count, mag > level);
165 166 167
  return ctx_idx;
}

Angie Chiang's avatar
Angie Chiang committed
168 169 170 171 172 173 174 175 176 177 178 179
#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,
};

180 181 182
#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
183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209

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;
}

210 211
static INLINE int get_br_ctx_from_count_mag(int row, int col, int count,
                                            int mag) {
212
  int offset = 0;
213
  if (mag <= BR_MAG_OFFSET)
Angie Chiang's avatar
Angie Chiang committed
214 215 216 217 218 219 220 221
    offset = 0;
  else if (mag <= 3)
    offset = 1;
  else if (mag <= 6)
    offset = 2;
  else
    offset = 3;

222
  int ctx = br_level_map[count];
Angie Chiang's avatar
Angie Chiang committed
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
  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;
}

238 239
static INLINE int get_br_ctx(const tran_low_t *tcoeffs,
                             const int c,  // raster order
240
                             const int bwl, const int height) {
241 242 243 244
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int level_minus_1 = NUM_BASE_LEVELS;
  int mag;
245 246 247
  const int count =
      get_level_count_mag(&mag, tcoeffs, bwl, height, row, col, level_minus_1,
                          br_ref_offset, BR_CONTEXT_POSITION_NUM);
248 249 250 251
  const int ctx = get_br_ctx_from_count_mag(row, col, count, mag);
  return ctx;
}

Angie Chiang's avatar
Angie Chiang committed
252
#define SIG_REF_OFFSET_NUM 7
253
static int sig_ref_offset[SIG_REF_OFFSET_NUM][2] = {
Angie Chiang's avatar
Angie Chiang committed
254 255
  { -2, -1 }, { -2, 0 }, { -1, -2 }, { -1, -1 },
  { -1, 0 },  { 0, -2 }, { 0, -1 },
Angie Chiang's avatar
Angie Chiang committed
256 257
};

258
static INLINE int get_nz_count(const tran_low_t *tcoeffs, int bwl, int height,
Angie Chiang's avatar
Angie Chiang committed
259
                               int row, int col) {
260 261 262 263
  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];
264 265
    if (ref_row < 0 || ref_col < 0 || ref_row >= height ||
        ref_col >= (1 << bwl))
266
      continue;
267
    const int nb_pos = (ref_row << bwl) + ref_col;
Angie Chiang's avatar
Angie Chiang committed
268
    count += (tcoeffs[nb_pos] != 0);
269 270 271 272
  }
  return count;
}

273 274 275 276 277 278 279 280 281 282 283 284 285 286
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;
  }
}

287 288 289 290
// 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
Angie Chiang's avatar
Angie Chiang committed
291
                                            int bwl, TX_TYPE tx_type) {
292
  (void)tx_type;
293 294 295
  const int row = coeff_idx >> bwl;
  const int col = coeff_idx - (row << bwl);
  int ctx = 0;
296 297 298 299 300 301 302 303 304 305 306 307
#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
308

309
  if (row == 0 && col == 0) return offset + 0;
310

Angie Chiang's avatar
Angie Chiang committed
311
  if (row == 0 && col == 1) return offset + 1 + count;
312

Angie Chiang's avatar
Angie Chiang committed
313
  if (row == 1 && col == 0) return offset + 3 + count;
314 315

  if (row == 1 && col == 1) {
Angie Chiang's avatar
Angie Chiang committed
316
    ctx = (count + 1) >> 1;
317 318 319

    assert(5 + ctx <= 7);

320
    return offset + 5 + ctx;
321 322 323 324 325
  }

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

Angie Chiang's avatar
Angie Chiang committed
326
    assert(ctx < 2);
327
    return offset + 8 + ctx;
328 329 330 331 332
  }

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

Angie Chiang's avatar
Angie Chiang committed
333 334
    assert(ctx < 2);
    return offset + 10 + ctx;
335 336 337 338
  }

  ctx = count >> 1;

Angie Chiang's avatar
Angie Chiang committed
339
  assert(12 + ctx < 16);
340

Angie Chiang's avatar
Angie Chiang committed
341
  return offset + 12 + ctx;
342 343
}

344 345 346
static INLINE int get_nz_map_ctx(const tran_low_t *tcoeffs,
                                 const int coeff_idx,  // raster order
                                 const int bwl, const int height,
Angie Chiang's avatar
Angie Chiang committed
347
                                 TX_TYPE tx_type) {
348 349
  const int row = coeff_idx >> bwl;
  const int col = coeff_idx - (row << bwl);
Angie Chiang's avatar
Angie Chiang committed
350 351
  int count = get_nz_count(tcoeffs, bwl, height, row, col);
  return get_nz_map_ctx_from_count(count, coeff_idx, bwl, tx_type);
352 353
}

Angie Chiang's avatar
Angie Chiang committed
354
static INLINE int get_eob_ctx(const tran_low_t *tcoeffs,
355
                              const int coeff_idx,  // raster order
356
                              const TX_SIZE txs_ctx) {
Angie Chiang's avatar
Angie Chiang committed
357
  (void)tcoeffs;
358 359 360 361
  if (txs_ctx == TX_4X4) return av1_coeff_band_4x4[coeff_idx];
  if (txs_ctx == TX_8X8) return av1_coeff_band_8x8[coeff_idx];
  if (txs_ctx == TX_16X16) return av1_coeff_band_16x16[coeff_idx];
  if (txs_ctx == TX_32X32) return av1_coeff_band_32x32[coeff_idx];
Angie Chiang's avatar
Angie Chiang committed
362

363 364
  assert(0);
  return 0;
Angie Chiang's avatar
Angie Chiang committed
365 366
}

367 368 369 370 371 372
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
373 374 375 376 377 378 379 380 381 382 383

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;
}

384 385
static INLINE void get_txb_ctx(BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
                               int plane, const ENTROPY_CONTEXT *a,
386
                               const ENTROPY_CONTEXT *l, TXB_CTX *txb_ctx) {
387 388
  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
389 390
  int ctx_offset = (plane == 0) ? 0 : 7;

391
  if (plane_bsize > txsize_to_bsize[tx_size]) ctx_offset += 3;
Angie Chiang's avatar
Angie Chiang committed
392

393
  int dc_sign = 0;
394
  for (int k = 0; k < txb_w_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
395
    int sign = ((uint8_t)a[k]) >> COEFF_CONTEXT_BITS;
Angie Chiang's avatar
Angie Chiang committed
396
    if (sign == 1)
397
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
398
    else if (sign == 2)
399
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
400
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
401
      assert(0);
402
  }
Angie Chiang's avatar
Angie Chiang committed
403

404 405
  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
406
    if (sign == 1)
407
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
408
    else if (sign == 2)
409
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
410
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
411
      assert(0);
Angie Chiang's avatar
Angie Chiang committed
412
  }
413

414
  txb_ctx->dc_sign_ctx = get_dc_sign_ctx(dc_sign);
Angie Chiang's avatar
Angie Chiang committed
415 416 417 418

  if (plane == 0) {
    int top = 0;
    int left = 0;
419 420

    for (int k = 0; k < txb_w_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
421
      top = AOMMAX(top, ((uint8_t)a[k] & COEFF_CONTEXT_MASK));
422 423 424
    }

    for (int k = 0; k < txb_h_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
425
      left = AOMMAX(left, ((uint8_t)l[k] & COEFF_CONTEXT_MASK));
Angie Chiang's avatar
Angie Chiang committed
426
    }
427

Angie Chiang's avatar
Angie Chiang committed
428 429 430
    top = AOMMIN(top, 255);
    left = AOMMIN(left, 255);

431
    if (plane_bsize == txsize_to_bsize[tx_size])
432
      txb_ctx->txb_skip_ctx = 0;
Angie Chiang's avatar
Angie Chiang committed
433
    else if (top == 0 && left == 0)
434
      txb_ctx->txb_skip_ctx = 1;
Angie Chiang's avatar
Angie Chiang committed
435
    else if (top == 0 || left == 0)
436
      txb_ctx->txb_skip_ctx = 2 + (AOMMAX(top, left) > 3);
Angie Chiang's avatar
Angie Chiang committed
437
    else if (AOMMAX(top, left) <= 3)
438
      txb_ctx->txb_skip_ctx = 4;
Angie Chiang's avatar
Angie Chiang committed
439
    else if (AOMMIN(top, left) <= 3)
440
      txb_ctx->txb_skip_ctx = 5;
Angie Chiang's avatar
Angie Chiang committed
441
    else
442
      txb_ctx->txb_skip_ctx = 6;
Angie Chiang's avatar
Angie Chiang committed
443 444
  } else {
    int ctx_base = get_entropy_context(tx_size, a, l);
445
    txb_ctx->txb_skip_ctx = ctx_offset + ctx_base;
Angie Chiang's avatar
Angie Chiang committed
446 447
  }
}
Angie Chiang's avatar
Angie Chiang committed
448

449 450 451 452
#if LV_MAP_PROB
void av1_init_txb_probs(FRAME_CONTEXT *fc);
#endif  // LV_MAP_PROB

Angie Chiang's avatar
Angie Chiang committed
453 454
void av1_adapt_txb_probs(AV1_COMMON *cm, unsigned int count_sat,
                         unsigned int update_factor);
455 456

void av1_init_lv_map(AV1_COMMON *cm);
Angie Chiang's avatar
Angie Chiang committed
457
#endif  // AV1_COMMON_TXB_COMMON_H_