txb_common.h 12.4 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
#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*/
};

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
static INLINE int get_level_count(const tran_low_t *tcoeffs, int stride,
                                  int row, int col, int level,
                                  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];
    const int pos = ref_row * stride + ref_col;
    if (ref_row < 0 || ref_col < 0 || ref_row >= stride || ref_col >= stride)
      continue;
    tran_low_t abs_coeff = abs(tcoeffs[pos]);
    count += abs_coeff > level;
  }
  return count;
}

static INLINE void get_mag(int *mag, const tran_low_t *tcoeffs, int stride,
                           int row, int col, int (*nb_offset)[2], int nb_num) {
  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];
    const int pos = ref_row * stride + ref_col;
    if (ref_row < 0 || ref_col < 0 || ref_row >= stride || ref_col >= stride)
      continue;
    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
72
static INLINE int get_level_count_mag(int *mag, const tran_low_t *tcoeffs,
73
74
                                      int stride, int row, int col, int level,
                                      int (*nb_offset)[2], int nb_num) {
Angie Chiang's avatar
Angie Chiang committed
75
76
77
  int count = 0;
  *mag = 0;
  for (int idx = 0; idx < nb_num; ++idx) {
78
79
80
    const int ref_row = row + nb_offset[idx][0];
    const int ref_col = col + nb_offset[idx][1];
    const int pos = ref_row * stride + ref_col;
Angie Chiang's avatar
Angie Chiang committed
81
82
    if (ref_row < 0 || ref_col < 0 || ref_row >= stride || ref_col >= stride)
      continue;
Angie Chiang's avatar
Angie Chiang committed
83
84
85
86
    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
87
  }
Angie Chiang's avatar
Angie Chiang committed
88
89
90
  return count;
}

91
92
93
94
static INLINE int get_base_ctx_from_count_mag(int row, int col, int count,
                                              int mag, int level) {
  const int ctx = (count + 1) >> 1;
  const int sig_mag = mag > level;
Angie Chiang's avatar
Angie Chiang committed
95
  int ctx_idx = -1;
Angie Chiang's avatar
Angie Chiang committed
96
  if (row == 0 && col == 0) {
97
    ctx_idx = (ctx << 1) + sig_mag;
Angie Chiang's avatar
Angie Chiang committed
98
99
    assert(ctx_idx < 8);
  } else if (row == 0) {
100
    ctx_idx = 8 + (ctx << 1) + sig_mag;
Angie Chiang's avatar
Angie Chiang committed
101
102
    assert(ctx_idx < 18);
  } else if (col == 0) {
103
    ctx_idx = 8 + 10 + (ctx << 1) + sig_mag;
Angie Chiang's avatar
Angie Chiang committed
104
105
    assert(ctx_idx < 28);
  } else {
106
    ctx_idx = 8 + 10 + 10 + (ctx << 1) + sig_mag;
Angie Chiang's avatar
Angie Chiang committed
107
108
109
110
111
    assert(ctx_idx < COEFF_BASE_CONTEXTS);
  }
  return ctx_idx;
}

112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
static INLINE int get_base_ctx(const tran_low_t *tcoeffs,
                               int c,  // raster order
                               const int bwl, const int level) {
  const int stride = 1 << bwl;
  const int row = c >> bwl;
  const int col = c - (row << bwl);
  const int level_minus_1 = level - 1;
  int mag;
  int count =
      get_level_count_mag(&mag, tcoeffs, stride, row, col, level_minus_1,
                          base_ref_offset, BASE_CONTEXT_POSITION_NUM);
  int ctx_idx = get_base_ctx_from_count_mag(row, col, count, mag, level);
  return ctx_idx;
}

Angie Chiang's avatar
Angie Chiang committed
127
128
129
130
131
132
133
134
135
136
137
138
#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,
};

139
140
141
142
143
#define BR_MAG_OFFSET 1
// TODO(angiebird): optimize this function by using a table to map from
// count/mag to ctx
static INLINE int get_br_ctx_from_count_mag(int row, int col, int count,
                                            int mag) {
144
  int offset = 0;
145
  if (mag <= BR_MAG_OFFSET)
Angie Chiang's avatar
Angie Chiang committed
146
147
148
149
150
151
152
153
    offset = 0;
  else if (mag <= 3)
    offset = 1;
  else if (mag <= 6)
    offset = 2;
  else
    offset = 3;

154
  int ctx = br_level_map[count];
Angie Chiang's avatar
Angie Chiang committed
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
  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;
}

170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
static INLINE int get_br_ctx(const tran_low_t *tcoeffs,
                             const int c,  // raster order
                             const int bwl) {
  const int stride = 1 << bwl;
  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(&mag, tcoeffs, stride, 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;
}

185
186
#define SIG_REF_OFFSET_NUM 11
static int sig_ref_offset[SIG_REF_OFFSET_NUM][2] = {
Angie Chiang's avatar
Angie Chiang committed
187
188
189
190
191
192
  { -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,
193
                                 const int coeff_idx,  // raster order
Angie Chiang's avatar
Angie Chiang committed
194
                                 const int bwl) {
195
196
  const int row = coeff_idx >> bwl;
  const int col = coeff_idx - (row << bwl);
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
  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;

217
    assert(5 + ctx <= 7);
Angie Chiang's avatar
Angie Chiang committed
218
219
220
221

    return 5 + ctx;
  }

222
  for (idx = 0; idx < SIG_REF_OFFSET_NUM; ++idx) {
Angie Chiang's avatar
Angie Chiang committed
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
    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;

238
    assert(ctx < 3);
Angie Chiang's avatar
Angie Chiang committed
239
240
241
242
243
244
    return 8 + ctx;
  }

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

245
    assert(ctx < 3);
Angie Chiang's avatar
Angie Chiang committed
246
247
248
249
250
    return 11 + ctx;
  }

  ctx >>= 1;

251
  assert(14 + ctx < 20);
Angie Chiang's avatar
Angie Chiang committed
252
253
254
255

  return 14 + ctx;
}

256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
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
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
static INLINE int get_nz_count(const tran_low_t *tcoeffs, int stride, int row,
                               int col, const int16_t *iscan) {
  int count = 0;
  const int pos = row * stride + col;
  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 >= stride || ref_col >= stride)
      continue;
    const int nb_pos = ref_row * stride + ref_col;
    if (iscan[nb_pos] < iscan[pos]) count += (tcoeffs[nb_pos] != 0);
  }
  return count;
}

// 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,
                                            const tran_low_t *tcoeffs,
                                            int coeff_idx,  // raster order
                                            int bwl, const int16_t *iscan) {
  const int row = coeff_idx >> bwl;
  const int col = coeff_idx - (row << bwl);
  int ctx = 0;

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

    ctx = (ctx + 1) >> 1;

    assert(5 + ctx <= 7);

    return 5 + ctx;
  }

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

    assert(ctx < 3);
    return 8 + ctx;
  }

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

    assert(ctx < 3);
    return 11 + ctx;
  }

  ctx = count >> 1;

  assert(14 + ctx < 20);

  return 14 + ctx;
}

// TODO(angiebird): merge this function with get_nz_map_ctx() after proper
// testing
static INLINE int get_nz_map_ctx2(const tran_low_t *tcoeffs,
                                  const int coeff_idx,  // raster order
                                  const int bwl, const int16_t *iscan) {
  int stride = 1 << bwl;
  const int row = coeff_idx >> bwl;
  const int col = coeff_idx - (row << bwl);
  int count = get_nz_count(tcoeffs, stride, row, col, iscan);
  return get_nz_map_ctx_from_count(count, tcoeffs, coeff_idx, bwl, iscan);
}

Angie Chiang's avatar
Angie Chiang committed
335
static INLINE int get_eob_ctx(const tran_low_t *tcoeffs,
336
                              const int coeff_idx,  // raster order
Angie Chiang's avatar
Angie Chiang committed
337
338
                              const int bwl) {
  (void)tcoeffs;
339
340
341
342
  if (bwl == 2) return av1_coeff_band_4x4[coeff_idx];
  if (bwl == 3) return av1_coeff_band_8x8[coeff_idx];
  if (bwl == 4) return av1_coeff_band_16x16[coeff_idx];
  if (bwl == 5) return av1_coeff_band_32x32[coeff_idx];
Angie Chiang's avatar
Angie Chiang committed
343

344
345
  assert(0);
  return 0;
Angie Chiang's avatar
Angie Chiang committed
346
347
}

348
349
350
351
352
353
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
354
355
356
357
358
359
360
361
362
363
364

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;
}

365
366
static INLINE void get_txb_ctx(BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
                               int plane, const ENTROPY_CONTEXT *a,
367
                               const ENTROPY_CONTEXT *l, TXB_CTX *txb_ctx) {
368
369
  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
370
371
  int ctx_offset = (plane == 0) ? 0 : 7;

372
  if (plane_bsize > txsize_to_bsize[tx_size]) ctx_offset += 3;
Angie Chiang's avatar
Angie Chiang committed
373

374
  int dc_sign = 0;
375
  for (int k = 0; k < txb_w_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
376
    int sign = ((uint8_t)a[k]) >> COEFF_CONTEXT_BITS;
Angie Chiang's avatar
Angie Chiang committed
377
    if (sign == 1)
378
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
379
    else if (sign == 2)
380
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
381
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
382
      assert(0);
383
  }
Angie Chiang's avatar
Angie Chiang committed
384

385
386
  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
387
    if (sign == 1)
388
      --dc_sign;
Angie Chiang's avatar
Angie Chiang committed
389
    else if (sign == 2)
390
      ++dc_sign;
Angie Chiang's avatar
Angie Chiang committed
391
    else if (sign != 0)
Angie Chiang's avatar
Angie Chiang committed
392
      assert(0);
Angie Chiang's avatar
Angie Chiang committed
393
  }
394

395
  txb_ctx->dc_sign_ctx = get_dc_sign_ctx(dc_sign);
Angie Chiang's avatar
Angie Chiang committed
396
397
398
399

  if (plane == 0) {
    int top = 0;
    int left = 0;
400
401

    for (int k = 0; k < txb_w_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
402
      top = AOMMAX(top, ((uint8_t)a[k] & COEFF_CONTEXT_MASK));
403
404
405
    }

    for (int k = 0; k < txb_h_unit; ++k) {
Angie Chiang's avatar
Angie Chiang committed
406
      left = AOMMAX(left, ((uint8_t)l[k] & COEFF_CONTEXT_MASK));
Angie Chiang's avatar
Angie Chiang committed
407
    }
408

Angie Chiang's avatar
Angie Chiang committed
409
410
411
    top = AOMMIN(top, 255);
    left = AOMMIN(left, 255);

412
    if (plane_bsize == txsize_to_bsize[tx_size])
413
      txb_ctx->txb_skip_ctx = 0;
Angie Chiang's avatar
Angie Chiang committed
414
    else if (top == 0 && left == 0)
415
      txb_ctx->txb_skip_ctx = 1;
Angie Chiang's avatar
Angie Chiang committed
416
    else if (top == 0 || left == 0)
417
      txb_ctx->txb_skip_ctx = 2 + (AOMMAX(top, left) > 3);
Angie Chiang's avatar
Angie Chiang committed
418
    else if (AOMMAX(top, left) <= 3)
419
      txb_ctx->txb_skip_ctx = 4;
Angie Chiang's avatar
Angie Chiang committed
420
    else if (AOMMIN(top, left) <= 3)
421
      txb_ctx->txb_skip_ctx = 5;
Angie Chiang's avatar
Angie Chiang committed
422
    else
423
      txb_ctx->txb_skip_ctx = 6;
Angie Chiang's avatar
Angie Chiang committed
424
425
  } else {
    int ctx_base = get_entropy_context(tx_size, a, l);
426
    txb_ctx->txb_skip_ctx = ctx_offset + ctx_base;
Angie Chiang's avatar
Angie Chiang committed
427
428
  }
}
Angie Chiang's avatar
Angie Chiang committed
429
430
431

void av1_adapt_txb_probs(AV1_COMMON *cm, unsigned int count_sat,
                         unsigned int update_factor);
Angie Chiang's avatar
Angie Chiang committed
432
#endif  // AV1_COMMON_TXB_COMMON_H_