bitstream.c 132 KB
Newer Older
Jingning Han's avatar
Jingning Han committed
1
/*
Yaowu Xu's avatar
Yaowu Xu committed
2
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
Jingning Han's avatar
Jingning Han committed
3
 *
Yaowu Xu's avatar
Yaowu Xu committed
4 5 6 7 8 9
 * 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.
Jingning Han's avatar
Jingning Han committed
10 11 12 13
 */

#include <assert.h>
#include <limits.h>
14
#include <stdio.h>
Jingning Han's avatar
Jingning Han committed
15

Yaowu Xu's avatar
Yaowu Xu committed
16
#include "aom/aom_encoder.h"
17
#include "aom_dsp/bitwriter_buffer.h"
Yaowu Xu's avatar
Yaowu Xu committed
18 19
#include "aom_dsp/aom_dsp_common.h"
#include "aom_mem/aom_mem.h"
20 21
#include "aom_ports/mem_ops.h"
#include "aom_ports/system_state.h"
22
#if CONFIG_BITSTREAM_DEBUG
23
#include "aom_util/debug_util.h"
24
#endif  // CONFIG_BITSTREAM_DEBUG
Jingning Han's avatar
Jingning Han committed
25

26
#if CONFIG_CLPF
27
#include "av1/common/clpf.h"
28
#endif
Yaowu Xu's avatar
Yaowu Xu committed
29
#if CONFIG_DERING
30
#include "av1/common/dering.h"
Yaowu Xu's avatar
Yaowu Xu committed
31
#endif  // CONFIG_DERING
32 33 34 35 36 37 38 39
#include "av1/common/entropy.h"
#include "av1/common/entropymode.h"
#include "av1/common/entropymv.h"
#include "av1/common/mvref_common.h"
#include "av1/common/pred_common.h"
#include "av1/common/reconinter.h"
#include "av1/common/seg_common.h"
#include "av1/common/tile_common.h"
Jingning Han's avatar
Jingning Han committed
40

Alex Converse's avatar
Alex Converse committed
41
#if CONFIG_ANS
Alex Converse's avatar
Alex Converse committed
42
#include "aom_dsp/buf_ans.h"
Alex Converse's avatar
Alex Converse committed
43
#endif  // CONFIG_ANS
44 45 46 47 48 49 50
#include "av1/encoder/bitstream.h"
#include "av1/encoder/cost.h"
#include "av1/encoder/encodemv.h"
#include "av1/encoder/mcomp.h"
#include "av1/encoder/segmentation.h"
#include "av1/encoder/subexp.h"
#include "av1/encoder/tokenize.h"
Jingning Han's avatar
Jingning Han committed
51

Yaowu Xu's avatar
Yaowu Xu committed
52
static const struct av1_token intra_mode_encodings[INTRA_MODES] = {
53 54 55
  { 0, 1 },  { 6, 3 },   { 28, 5 },  { 30, 5 }, { 58, 6 },
  { 59, 6 }, { 126, 7 }, { 127, 7 }, { 62, 6 }, { 2, 2 }
};
Jingning Han's avatar
Jingning Han committed
56
#if CONFIG_EXT_INTERP
Yaowu Xu's avatar
Yaowu Xu committed
57
static const struct av1_token switchable_interp_encodings[SWITCHABLE_FILTERS] =
58
    { { 0, 1 }, { 4, 3 }, { 6, 3 }, { 5, 3 }, { 7, 3 } };
59
#else
Yaowu Xu's avatar
Yaowu Xu committed
60
static const struct av1_token switchable_interp_encodings[SWITCHABLE_FILTERS] =
61
    { { 0, 1 }, { 2, 2 }, { 3, 2 } };
Jingning Han's avatar
Jingning Han committed
62
#endif  // CONFIG_EXT_INTERP
63
#if CONFIG_EXT_PARTITION_TYPES
Yaowu Xu's avatar
Yaowu Xu committed
64
static const struct av1_token ext_partition_encodings[EXT_PARTITION_TYPES] = {
65 66 67
  { 0, 1 },  { 4, 3 },  { 12, 4 }, { 7, 3 },
  { 10, 4 }, { 11, 4 }, { 26, 5 }, { 27, 5 }
};
68
#endif
Yaowu Xu's avatar
Yaowu Xu committed
69
static const struct av1_token partition_encodings[PARTITION_TYPES] = {
70 71
  { 0, 1 }, { 2, 2 }, { 6, 3 }, { 7, 3 }
};
72
#if !CONFIG_REF_MV
Yaowu Xu's avatar
Yaowu Xu committed
73
static const struct av1_token inter_mode_encodings[INTER_MODES] =
Yue Chen's avatar
Yue Chen committed
74
#if CONFIG_EXT_INTER
75
    { { 2, 2 }, { 6, 3 }, { 0, 1 }, { 14, 4 }, { 15, 4 } };
Yue Chen's avatar
Yue Chen committed
76
#else
77
    { { 2, 2 }, { 6, 3 }, { 0, 1 }, { 7, 3 } };
Yue Chen's avatar
Yue Chen committed
78
#endif  // CONFIG_EXT_INTER
79
#endif
80
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
81
static const struct av1_token
82 83 84 85
    inter_compound_mode_encodings[INTER_COMPOUND_MODES] = {
      { 2, 2 },  { 50, 6 }, { 51, 6 }, { 24, 5 }, { 52, 6 },
      { 53, 6 }, { 54, 6 }, { 55, 6 }, { 0, 1 },  { 7, 3 }
    };
86
#endif  // CONFIG_EXT_INTER
87
#if CONFIG_PALETTE
Yaowu Xu's avatar
Yaowu Xu committed
88
static const struct av1_token palette_size_encodings[] = {
89
  { 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 62, 6 }, { 63, 6 },
hui su's avatar
hui su committed
90
};
Yaowu Xu's avatar
Yaowu Xu committed
91
static const struct av1_token
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
    palette_color_encodings[PALETTE_MAX_SIZE - 1][PALETTE_MAX_SIZE] = {
      { { 0, 1 }, { 1, 1 } },                                  // 2 colors
      { { 0, 1 }, { 2, 2 }, { 3, 2 } },                        // 3 colors
      { { 0, 1 }, { 2, 2 }, { 6, 3 }, { 7, 3 } },              // 4 colors
      { { 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 } },  // 5 colors
      { { 0, 1 },
        { 2, 2 },
        { 6, 3 },
        { 14, 4 },
        { 30, 5 },
        { 31, 5 } },  // 6 colors
      { { 0, 1 },
        { 2, 2 },
        { 6, 3 },
        { 14, 4 },
        { 30, 5 },
        { 62, 6 },
        { 63, 6 } },  // 7 colors
      { { 0, 1 },
        { 2, 2 },
        { 6, 3 },
        { 14, 4 },
        { 30, 5 },
        { 62, 6 },
        { 126, 7 },
        { 127, 7 } },  // 8 colors
    };
119
#endif  // CONFIG_PALETTE
120

Yaowu Xu's avatar
Yaowu Xu committed
121
static const struct av1_token tx_size_encodings[TX_SIZES - 1][TX_SIZES] = {
122 123 124
  { { 0, 1 }, { 1, 1 } },                      // Max tx_size is 8X8
  { { 0, 1 }, { 2, 2 }, { 3, 2 } },            // Max tx_size is 16X16
  { { 0, 1 }, { 2, 2 }, { 6, 3 }, { 7, 3 } },  // Max tx_size is 32X32
125 126
};

127
#if CONFIG_EXT_INTRA || CONFIG_PALETTE
Yaowu Xu's avatar
Yaowu Xu committed
128
static INLINE void write_uniform(aom_writer *w, int n, int v) {
hui su's avatar
hui su committed
129 130
  int l = get_unsigned_bits(n);
  int m = (1 << l) - n;
131
  if (l == 0) return;
hui su's avatar
hui su committed
132
  if (v < m) {
Yaowu Xu's avatar
Yaowu Xu committed
133
    aom_write_literal(w, v, l - 1);
hui su's avatar
hui su committed
134
  } else {
Yaowu Xu's avatar
Yaowu Xu committed
135 136
    aom_write_literal(w, m + ((v - m) >> 1), l - 1);
    aom_write_literal(w, (v - m) & 1, 1);
hui su's avatar
hui su committed
137 138
  }
}
139
#endif  // CONFIG_EXT_INTRA || CONFIG_PALETTE
Jingning Han's avatar
Jingning Han committed
140

141
#if CONFIG_EXT_TX
Yaowu Xu's avatar
Yaowu Xu committed
142 143
static struct av1_token ext_tx_inter_encodings[EXT_TX_SETS_INTER][TX_TYPES];
static struct av1_token ext_tx_intra_encodings[EXT_TX_SETS_INTRA][TX_TYPES];
144
#else
Yaowu Xu's avatar
Yaowu Xu committed
145
static struct av1_token ext_tx_encodings[TX_TYPES];
146
#endif  // CONFIG_EXT_TX
147
#if CONFIG_GLOBAL_MOTION
Yaowu Xu's avatar
Yaowu Xu committed
148
static struct av1_token global_motion_types_encodings[GLOBAL_MOTION_TYPES];
149
#endif  // CONFIG_GLOBAL_MOTION
150
#if CONFIG_EXT_INTRA
Yaowu Xu's avatar
Yaowu Xu committed
151
static struct av1_token intra_filter_encodings[INTRA_FILTERS];
152
#endif  // CONFIG_EXT_INTRA
153
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
154
static struct av1_token interintra_mode_encodings[INTERINTRA_MODES];
155
#endif  // CONFIG_EXT_INTER
Yue Chen's avatar
Yue Chen committed
156 157 158
#if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
static struct av1_token motion_mode_encodings[MOTION_MODES];
#endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
159 160 161
#if CONFIG_LOOP_RESTORATION
static struct av1_token switchable_restore_encodings[RESTORE_SWITCHABLE_TYPES];
#endif  // CONFIG_LOOP_RESTORATION
162

Yaowu Xu's avatar
Yaowu Xu committed
163
void av1_encode_token_init(void) {
164
#if CONFIG_EXT_TX
165 166
  int s;
  for (s = 1; s < EXT_TX_SETS_INTER; ++s) {
Yaowu Xu's avatar
Yaowu Xu committed
167
    av1_tokens_from_tree(ext_tx_inter_encodings[s], av1_ext_tx_inter_tree[s]);
168 169
  }
  for (s = 1; s < EXT_TX_SETS_INTRA; ++s) {
Yaowu Xu's avatar
Yaowu Xu committed
170
    av1_tokens_from_tree(ext_tx_intra_encodings[s], av1_ext_tx_intra_tree[s]);
171
  }
172
#else
Yaowu Xu's avatar
Yaowu Xu committed
173
  av1_tokens_from_tree(ext_tx_encodings, av1_ext_tx_tree);
174
#endif  // CONFIG_EXT_TX
175
#if CONFIG_EXT_INTRA
Yaowu Xu's avatar
Yaowu Xu committed
176
  av1_tokens_from_tree(intra_filter_encodings, av1_intra_filter_tree);
177
#endif  // CONFIG_EXT_INTRA
178
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
179
  av1_tokens_from_tree(interintra_mode_encodings, av1_interintra_mode_tree);
180
#endif  // CONFIG_EXT_INTER
Yue Chen's avatar
Yue Chen committed
181 182 183
#if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
  av1_tokens_from_tree(motion_mode_encodings, av1_motion_mode_tree);
#endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
184
#if CONFIG_GLOBAL_MOTION
Yaowu Xu's avatar
Yaowu Xu committed
185 186
  av1_tokens_from_tree(global_motion_types_encodings,
                       av1_global_motion_types_tree);
187
#endif  // CONFIG_GLOBAL_MOTION
188 189 190 191
#if CONFIG_LOOP_RESTORATION
  av1_tokens_from_tree(switchable_restore_encodings,
                       av1_switchable_restore_tree);
#endif  // CONFIG_LOOP_RESTORATION
192 193
}

Yaowu Xu's avatar
Yaowu Xu committed
194 195 196
static void write_intra_mode(aom_writer *w, PREDICTION_MODE mode,
                             const aom_prob *probs) {
  av1_write_token(w, av1_intra_mode_tree, probs, &intra_mode_encodings[mode]);
Jingning Han's avatar
Jingning Han committed
197 198
}

199
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
200 201 202 203
static void write_interintra_mode(aom_writer *w, INTERINTRA_MODE mode,
                                  const aom_prob *probs) {
  av1_write_token(w, av1_interintra_mode_tree, probs,
                  &interintra_mode_encodings[mode]);
204 205 206
}
#endif  // CONFIG_EXT_INTER

Yaowu Xu's avatar
Yaowu Xu committed
207
static void write_inter_mode(AV1_COMMON *cm, aom_writer *w,
208
                             PREDICTION_MODE mode,
Yue Chen's avatar
Yue Chen committed
209 210 211
#if CONFIG_REF_MV && CONFIG_EXT_INTER
                             int is_compound,
#endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
212
                             const int16_t mode_ctx) {
213
#if CONFIG_REF_MV
214
  const int16_t newmv_ctx = mode_ctx & NEWMV_CTX_MASK;
Yaowu Xu's avatar
Yaowu Xu committed
215
  const aom_prob newmv_prob = cm->fc->newmv_prob[newmv_ctx];
Yue Chen's avatar
Yue Chen committed
216
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
217
  aom_write(w, mode != NEWMV && mode != NEWFROMNEARMV, newmv_prob);
Yue Chen's avatar
Yue Chen committed
218 219

  if (!is_compound && (mode == NEWMV || mode == NEWFROMNEARMV))
Yaowu Xu's avatar
Yaowu Xu committed
220
    aom_write(w, mode == NEWFROMNEARMV, cm->fc->new2mv_prob);
Yue Chen's avatar
Yue Chen committed
221 222 223

  if (mode != NEWMV && mode != NEWFROMNEARMV) {
#else
Yaowu Xu's avatar
Yaowu Xu committed
224
  aom_write(w, mode != NEWMV, newmv_prob);
225 226

  if (mode != NEWMV) {
Yue Chen's avatar
Yue Chen committed
227
#endif  // CONFIG_EXT_INTER
228
    const int16_t zeromv_ctx = (mode_ctx >> ZEROMV_OFFSET) & ZEROMV_CTX_MASK;
Yaowu Xu's avatar
Yaowu Xu committed
229
    const aom_prob zeromv_prob = cm->fc->zeromv_prob[zeromv_ctx];
230 231 232 233 234 235

    if (mode_ctx & (1 << ALL_ZERO_FLAG_OFFSET)) {
      assert(mode == ZEROMV);
      return;
    }

Yaowu Xu's avatar
Yaowu Xu committed
236
    aom_write(w, mode != ZEROMV, zeromv_prob);
237 238

    if (mode != ZEROMV) {
239
      int16_t refmv_ctx = (mode_ctx >> REFMV_OFFSET) & REFMV_CTX_MASK;
Yaowu Xu's avatar
Yaowu Xu committed
240
      aom_prob refmv_prob;
241

242 243 244
      if (mode_ctx & (1 << SKIP_NEARESTMV_OFFSET)) refmv_ctx = 6;
      if (mode_ctx & (1 << SKIP_NEARMV_OFFSET)) refmv_ctx = 7;
      if (mode_ctx & (1 << SKIP_NEARESTMV_SUB8X8_OFFSET)) refmv_ctx = 8;
245 246

      refmv_prob = cm->fc->refmv_prob[refmv_ctx];
Yaowu Xu's avatar
Yaowu Xu committed
247
      aom_write(w, mode != NEARESTMV, refmv_prob);
248 249 250
    }
  }
#else
Yaowu Xu's avatar
Yaowu Xu committed
251
  const aom_prob *const inter_probs = cm->fc->inter_mode_probs[mode_ctx];
Jingning Han's avatar
Jingning Han committed
252
  assert(is_inter_mode(mode));
Yaowu Xu's avatar
Yaowu Xu committed
253 254
  av1_write_token(w, av1_inter_mode_tree, inter_probs,
                  &inter_mode_encodings[INTER_OFFSET(mode)]);
255
#endif
Jingning Han's avatar
Jingning Han committed
256 257
}

258
#if CONFIG_REF_MV
Yaowu Xu's avatar
Yaowu Xu committed
259 260 261
static void write_drl_idx(const AV1_COMMON *cm, const MB_MODE_INFO *mbmi,
                          const MB_MODE_INFO_EXT *mbmi_ext, aom_writer *w) {
  uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
262 263 264

  assert(mbmi->ref_mv_idx < 3);

265 266 267 268 269
  if (mbmi->mode == NEWMV) {
    int idx;
    for (idx = 0; idx < 2; ++idx) {
      if (mbmi_ext->ref_mv_count[ref_frame_type] > idx + 1) {
        uint8_t drl_ctx =
Yaowu Xu's avatar
Yaowu Xu committed
270 271
            av1_drl_ctx(mbmi_ext->ref_mv_stack[ref_frame_type], idx);
        aom_prob drl_prob = cm->fc->drl_prob[drl_ctx];
272

Yaowu Xu's avatar
Yaowu Xu committed
273
        aom_write(w, mbmi->ref_mv_idx != idx, drl_prob);
274
        if (mbmi->ref_mv_idx == idx) return;
275
      }
276 277 278 279
    }
    return;
  }

280 281 282 283 284 285
  if (mbmi->mode == NEARMV) {
    int idx;
    // TODO(jingning): Temporary solution to compensate the NEARESTMV offset.
    for (idx = 1; idx < 3; ++idx) {
      if (mbmi_ext->ref_mv_count[ref_frame_type] > idx + 1) {
        uint8_t drl_ctx =
Yaowu Xu's avatar
Yaowu Xu committed
286 287
            av1_drl_ctx(mbmi_ext->ref_mv_stack[ref_frame_type], idx);
        aom_prob drl_prob = cm->fc->drl_prob[drl_ctx];
288

Yaowu Xu's avatar
Yaowu Xu committed
289
        aom_write(w, mbmi->ref_mv_idx != (idx - 1), drl_prob);
290
        if (mbmi->ref_mv_idx == (idx - 1)) return;
291
      }
292
    }
293
    return;
294 295 296 297
  }
}
#endif

298
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
299
static void write_inter_compound_mode(AV1_COMMON *cm, aom_writer *w,
300 301
                                      PREDICTION_MODE mode,
                                      const int16_t mode_ctx) {
Yaowu Xu's avatar
Yaowu Xu committed
302
  const aom_prob *const inter_compound_probs =
303
      cm->fc->inter_compound_mode_probs[mode_ctx];
304 305

  assert(is_inter_compound_mode(mode));
Yaowu Xu's avatar
Yaowu Xu committed
306 307
  av1_write_token(w, av1_inter_compound_mode_tree, inter_compound_probs,
                  &inter_compound_mode_encodings[INTER_COMPOUND_OFFSET(mode)]);
308 309 310
}
#endif  // CONFIG_EXT_INTER

Yaowu Xu's avatar
Yaowu Xu committed
311
static void encode_unsigned_max(struct aom_write_bit_buffer *wb, int data,
312
                                int max) {
Yaowu Xu's avatar
Yaowu Xu committed
313
  aom_wb_write_literal(wb, data, get_unsigned_bits(max));
Jingning Han's avatar
Jingning Han committed
314 315
}

Yaowu Xu's avatar
Yaowu Xu committed
316 317
static void prob_diff_update(const aom_tree_index *tree,
                             aom_prob probs[/*n - 1*/],
318
                             const unsigned int counts[/*n - 1*/], int n,
Yaowu Xu's avatar
Yaowu Xu committed
319
                             aom_writer *w) {
Jingning Han's avatar
Jingning Han committed
320 321 322 323 324 325
  int i;
  unsigned int branch_ct[32][2];

  // Assuming max number of probabilities <= 32
  assert(n <= 32);

Yaowu Xu's avatar
Yaowu Xu committed
326
  av1_tree_probs_from_distribution(tree, branch_ct, counts);
Jingning Han's avatar
Jingning Han committed
327
  for (i = 0; i < n - 1; ++i)
Yaowu Xu's avatar
Yaowu Xu committed
328
    av1_cond_prob_diff_update(w, &probs[i], branch_ct[i]);
Jingning Han's avatar
Jingning Han committed
329 330
}

Yaowu Xu's avatar
Yaowu Xu committed
331 332
static int prob_diff_update_savings(const aom_tree_index *tree,
                                    aom_prob probs[/*n - 1*/],
333 334 335 336 337 338 339 340
                                    const unsigned int counts[/*n - 1*/],
                                    int n) {
  int i;
  unsigned int branch_ct[32][2];
  int savings = 0;

  // Assuming max number of probabilities <= 32
  assert(n <= 32);
Yaowu Xu's avatar
Yaowu Xu committed
341
  av1_tree_probs_from_distribution(tree, branch_ct, counts);
342
  for (i = 0; i < n - 1; ++i) {
Yaowu Xu's avatar
Yaowu Xu committed
343
    savings += av1_cond_prob_diff_update_savings(&probs[i], branch_ct[i]);
344 345 346 347
  }
  return savings;
}

348
#if CONFIG_VAR_TX
Yaowu Xu's avatar
Yaowu Xu committed
349
static void write_tx_size_vartx(const AV1_COMMON *cm, const MACROBLOCKD *xd,
350
                                const MB_MODE_INFO *mbmi, TX_SIZE tx_size,
Yaowu Xu's avatar
Yaowu Xu committed
351
                                int blk_row, int blk_col, aom_writer *w) {
352 353
  const int tx_row = blk_row >> 1;
  const int tx_col = blk_col >> 1;
354 355
  int max_blocks_high = num_4x4_blocks_high_lookup[mbmi->sb_type];
  int max_blocks_wide = num_4x4_blocks_wide_lookup[mbmi->sb_type];
356
  int ctx = txfm_partition_context(xd->above_txfm_context + tx_col,
357
                                   xd->left_txfm_context + tx_row, tx_size);
358

359 360
  if (xd->mb_to_bottom_edge < 0) max_blocks_high += xd->mb_to_bottom_edge >> 5;
  if (xd->mb_to_right_edge < 0) max_blocks_wide += xd->mb_to_right_edge >> 5;
361

362
  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide) return;
363

364
  if (tx_size == mbmi->inter_tx_size[tx_row][tx_col]) {
Yaowu Xu's avatar
Yaowu Xu committed
365
    aom_write(w, 0, cm->fc->txfm_partition_prob[ctx]);
366 367
    txfm_partition_update(xd->above_txfm_context + tx_col,
                          xd->left_txfm_context + tx_row, tx_size);
368 369
  } else {
    const BLOCK_SIZE bsize = txsize_to_bsize[tx_size];
370
    int bsl = b_width_log2_lookup[bsize];
371
    int i;
Yaowu Xu's avatar
Yaowu Xu committed
372
    aom_write(w, 1, cm->fc->txfm_partition_prob[ctx]);
373

374
    if (tx_size == TX_8X8) {
375 376
      txfm_partition_update(xd->above_txfm_context + tx_col,
                            xd->left_txfm_context + tx_row, TX_4X4);
377
      return;
378
    }
379 380 381 382

    assert(bsl > 0);
    --bsl;
    for (i = 0; i < 4; ++i) {
383 384
      int offsetr = blk_row + ((i >> 1) << bsl);
      int offsetc = blk_col + ((i & 0x01) << bsl);
Debargha Mukherjee's avatar
Debargha Mukherjee committed
385
      write_tx_size_vartx(cm, xd, mbmi, tx_size - 1, offsetr, offsetc, w);
386 387 388
    }
  }
}
389

Yaowu Xu's avatar
Yaowu Xu committed
390
static void update_txfm_partition_probs(AV1_COMMON *cm, aom_writer *w,
391 392 393
                                        FRAME_COUNTS *counts) {
  int k;
  for (k = 0; k < TXFM_PARTITION_CONTEXTS; ++k)
Yaowu Xu's avatar
Yaowu Xu committed
394 395
    av1_cond_prob_diff_update(w, &cm->fc->txfm_partition_prob[k],
                              counts->txfm_partition[k]);
396
}
397 398
#endif

Yaowu Xu's avatar
Yaowu Xu committed
399 400
static void write_selected_tx_size(const AV1_COMMON *cm, const MACROBLOCKD *xd,
                                   aom_writer *w) {
401 402
  const MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const BLOCK_SIZE bsize = mbmi->sb_type;
403 404
  // For sub8x8 blocks the tx_size symbol does not need to be sent
  if (bsize >= BLOCK_8X8) {
405 406 407 408 409 410 411 412
    const TX_SIZE tx_size = mbmi->tx_size;
    const int is_inter = is_inter_block(mbmi);
    const int tx_size_ctx = get_tx_size_context(xd);
    const int tx_size_cat = is_inter ? inter_tx_size_cat_lookup[bsize]
                                     : intra_tx_size_cat_lookup[bsize];
    const TX_SIZE coded_tx_size = txsize_sqr_up_map[tx_size];

#if CONFIG_EXT_TX && CONFIG_RECT_TX
413
    assert(IMPLIES(is_rect_tx(tx_size), is_rect_tx_allowed(xd, mbmi)));
414 415 416 417
    assert(
        IMPLIES(is_rect_tx(tx_size), tx_size == max_txsize_rect_lookup[bsize]));
#endif  // CONFIG_EXT_TX && CONFIG_RECT_TX

Yaowu Xu's avatar
Yaowu Xu committed
418 419 420
    av1_write_token(w, av1_tx_size_tree[tx_size_cat],
                    cm->fc->tx_size_probs[tx_size_cat][tx_size_ctx],
                    &tx_size_encodings[tx_size_cat][coded_tx_size]);
Jingning Han's avatar
Jingning Han committed
421 422 423
  }
}

424
#if CONFIG_REF_MV
Yaowu Xu's avatar
Yaowu Xu committed
425
static void update_inter_mode_probs(AV1_COMMON *cm, aom_writer *w,
426 427 428
                                    FRAME_COUNTS *counts) {
  int i;
  for (i = 0; i < NEWMV_MODE_CONTEXTS; ++i)
Yaowu Xu's avatar
Yaowu Xu committed
429
    av1_cond_prob_diff_update(w, &cm->fc->newmv_prob[i], counts->newmv_mode[i]);
430
  for (i = 0; i < ZEROMV_MODE_CONTEXTS; ++i)
Yaowu Xu's avatar
Yaowu Xu committed
431 432
    av1_cond_prob_diff_update(w, &cm->fc->zeromv_prob[i],
                              counts->zeromv_mode[i]);
433
  for (i = 0; i < REFMV_MODE_CONTEXTS; ++i)
Yaowu Xu's avatar
Yaowu Xu committed
434
    av1_cond_prob_diff_update(w, &cm->fc->refmv_prob[i], counts->refmv_mode[i]);
435
  for (i = 0; i < DRL_MODE_CONTEXTS; ++i)
Yaowu Xu's avatar
Yaowu Xu committed
436
    av1_cond_prob_diff_update(w, &cm->fc->drl_prob[i], counts->drl_mode[i]);
Yue Chen's avatar
Yue Chen committed
437
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
438
  av1_cond_prob_diff_update(w, &cm->fc->new2mv_prob, counts->new2mv_mode);
Yue Chen's avatar
Yue Chen committed
439
#endif  // CONFIG_EXT_INTER
440 441 442
}
#endif

443
#if CONFIG_EXT_INTER
Yaowu Xu's avatar
Yaowu Xu committed
444 445 446
static void update_inter_compound_mode_probs(AV1_COMMON *cm, aom_writer *w) {
  const int savings_thresh = av1_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             av1_cost_zero(GROUP_DIFF_UPDATE_PROB);
447 448 449 450
  int i;
  int savings = 0;
  int do_update = 0;
  for (i = 0; i < INTER_MODE_CONTEXTS; ++i) {
451
    savings += prob_diff_update_savings(
Yaowu Xu's avatar
Yaowu Xu committed
452
        av1_inter_compound_mode_tree, cm->fc->inter_compound_mode_probs[i],
453
        cm->counts.inter_compound_mode[i], INTER_COMPOUND_MODES);
454 455
  }
  do_update = savings > savings_thresh;
Yaowu Xu's avatar
Yaowu Xu committed
456
  aom_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
457 458
  if (do_update) {
    for (i = 0; i < INTER_MODE_CONTEXTS; ++i) {
459
      prob_diff_update(
Yaowu Xu's avatar
Yaowu Xu committed
460
          av1_inter_compound_mode_tree, cm->fc->inter_compound_mode_probs[i],
461
          cm->counts.inter_compound_mode[i], INTER_COMPOUND_MODES, w);
462 463 464 465 466
    }
  }
}
#endif  // CONFIG_EXT_INTER

Yaowu Xu's avatar
Yaowu Xu committed
467 468
static int write_skip(const AV1_COMMON *cm, const MACROBLOCKD *xd,
                      int segment_id, const MODE_INFO *mi, aom_writer *w) {
Jingning Han's avatar
Jingning Han committed
469 470 471 472
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
    return 1;
  } else {
    const int skip = mi->mbmi.skip;
Yaowu Xu's avatar
Yaowu Xu committed
473
    aom_write(w, skip, av1_get_skip_prob(cm, xd));
Jingning Han's avatar
Jingning Han committed
474 475 476 477
    return skip;
  }
}

Yaowu Xu's avatar
Yaowu Xu committed
478
static void update_skip_probs(AV1_COMMON *cm, aom_writer *w,
Jingning Han's avatar
Jingning Han committed
479 480 481 482
                              FRAME_COUNTS *counts) {
  int k;

  for (k = 0; k < SKIP_CONTEXTS; ++k)
Yaowu Xu's avatar
Yaowu Xu committed
483
    av1_cond_prob_diff_update(w, &cm->fc->skip_probs[k], counts->skip[k]);
Jingning Han's avatar
Jingning Han committed
484 485
}

Yaowu Xu's avatar
Yaowu Xu committed
486
static void update_switchable_interp_probs(AV1_COMMON *cm, aom_writer *w,
Jingning Han's avatar
Jingning Han committed
487 488 489
                                           FRAME_COUNTS *counts) {
  int j;
  for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j)
Yaowu Xu's avatar
Yaowu Xu committed
490
    prob_diff_update(av1_switchable_interp_tree,
Jingning Han's avatar
Jingning Han committed
491 492 493 494
                     cm->fc->switchable_interp_prob[j],
                     counts->switchable_interp[j], SWITCHABLE_FILTERS, w);
}

495
#if CONFIG_EXT_TX
Yaowu Xu's avatar
Yaowu Xu committed
496 497 498
static void update_ext_tx_probs(AV1_COMMON *cm, aom_writer *w) {
  const int savings_thresh = av1_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             av1_cost_zero(GROUP_DIFF_UPDATE_PROB);
499
  int i, j;
500 501 502 503 504
  int s;
  for (s = 1; s < EXT_TX_SETS_INTER; ++s) {
    int savings = 0;
    int do_update = 0;
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
505
      if (!use_inter_ext_tx_for_txsize[s][i]) continue;
506
      savings += prob_diff_update_savings(
Yaowu Xu's avatar
Yaowu Xu committed
507
          av1_ext_tx_inter_tree[s], cm->fc->inter_ext_tx_prob[s][i],
508 509 510
          cm->counts.inter_ext_tx[s][i], num_ext_tx_set_inter[s]);
    }
    do_update = savings > savings_thresh;
Yaowu Xu's avatar
Yaowu Xu committed
511
    aom_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
512 513
    if (do_update) {
      for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
514
        if (!use_inter_ext_tx_for_txsize[s][i]) continue;
515
        prob_diff_update(
Yaowu Xu's avatar
Yaowu Xu committed
516
            av1_ext_tx_inter_tree[s], cm->fc->inter_ext_tx_prob[s][i],
517
            cm->counts.inter_ext_tx[s][i], num_ext_tx_set_inter[s], w);
518
      }
519 520
    }
  }
521

522 523 524 525
  for (s = 1; s < EXT_TX_SETS_INTRA; ++s) {
    int savings = 0;
    int do_update = 0;
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
526
      if (!use_intra_ext_tx_for_txsize[s][i]) continue;
527
      for (j = 0; j < INTRA_MODES; ++j)
528
        savings += prob_diff_update_savings(
Yaowu Xu's avatar
Yaowu Xu committed
529
            av1_ext_tx_intra_tree[s], cm->fc->intra_ext_tx_prob[s][i][j],
530 531 532
            cm->counts.intra_ext_tx[s][i][j], num_ext_tx_set_intra[s]);
    }
    do_update = savings > savings_thresh;
Yaowu Xu's avatar
Yaowu Xu committed
533
    aom_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
534 535
    if (do_update) {
      for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
536
        if (!use_intra_ext_tx_for_txsize[s][i]) continue;
537
        for (j = 0; j < INTRA_MODES; ++j)
538
          prob_diff_update(
Yaowu Xu's avatar
Yaowu Xu committed
539
              av1_ext_tx_intra_tree[s], cm->fc->intra_ext_tx_prob[s][i][j],
540
              cm->counts.intra_ext_tx[s][i][j], num_ext_tx_set_intra[s], w);
541 542
      }
    }
543
  }
544
}
Debargha Mukherjee's avatar
Debargha Mukherjee committed
545

546
#else
Debargha Mukherjee's avatar
Debargha Mukherjee committed
547

Yaowu Xu's avatar
Yaowu Xu committed
548 549 550
static void update_ext_tx_probs(AV1_COMMON *cm, aom_writer *w) {
  const int savings_thresh = av1_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             av1_cost_zero(GROUP_DIFF_UPDATE_PROB);
551 552 553 554 555 556 557
  int i, j;

  int savings = 0;
  int do_update = 0;
  for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
    for (j = 0; j < TX_TYPES; ++j)
      savings += prob_diff_update_savings(
Yaowu Xu's avatar
Yaowu Xu committed
558
          av1_ext_tx_tree, cm->fc->intra_ext_tx_prob[i][j],
559 560 561
          cm->counts.intra_ext_tx[i][j], TX_TYPES);
  }
  do_update = savings > savings_thresh;
Yaowu Xu's avatar
Yaowu Xu committed
562
  aom_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
563 564 565
  if (do_update) {
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
      for (j = 0; j < TX_TYPES; ++j)
Yaowu Xu's avatar
Yaowu Xu committed
566
        prob_diff_update(av1_ext_tx_tree, cm->fc->intra_ext_tx_prob[i][j],
567
                         cm->counts.intra_ext_tx[i][j], TX_TYPES, w);
568 569 570 571
    }
  }
  savings = 0;
  for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
572
    savings +=
Yaowu Xu's avatar
Yaowu Xu committed
573
        prob_diff_update_savings(av1_ext_tx_tree, cm->fc->inter_ext_tx_prob[i],
574
                                 cm->counts.inter_ext_tx[i], TX_TYPES);
575 576
  }
  do_update = savings > savings_thresh;
Yaowu Xu's avatar
Yaowu Xu committed
577
  aom_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
578 579
  if (do_update) {
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
Yaowu Xu's avatar
Yaowu Xu committed
580
      prob_diff_update(av1_ext_tx_tree, cm->fc->inter_ext_tx_prob[i],
581
                       cm->counts.inter_ext_tx[i], TX_TYPES, w);
582 583 584
    }
  }
}
585 586
#endif  // CONFIG_EXT_TX

587
#if CONFIG_PALETTE
Yaowu Xu's avatar
Yaowu Xu committed
588
static void pack_palette_tokens(aom_writer *w, const TOKENEXTRA **tp, int n,
589
                                int num) {
hui su's avatar
hui su committed
590
  int i;
591
  const TOKENEXTRA *p = *tp;
hui su's avatar
hui su committed
592

593
  for (i = 0; i < num; ++i) {
Yaowu Xu's avatar
Yaowu Xu committed
594 595
    av1_write_token(w, av1_palette_color_tree[n - 2], p->context_tree,
                    &palette_color_encodings[n - 2][p->token]);
hui su's avatar
hui su committed
596 597 598 599 600
    ++p;
  }

  *tp = p;
}
601
#endif  // CONFIG_PALETTE
hui su's avatar
hui su committed
602

603
#if CONFIG_SUPERTX
Yaowu Xu's avatar
Yaowu Xu committed
604 605 606
static void update_supertx_probs(AV1_COMMON *cm, aom_writer *w) {
  const int savings_thresh = av1_cost_one(GROUP_DIFF_UPDATE_PROB) -
                             av1_cost_zero(GROUP_DIFF_UPDATE_PROB);
607 608 609 610 611
  int i, j;
  int savings = 0;
  int do_update = 0;
  for (i = 0; i < PARTITION_SUPERTX_CONTEXTS; ++i) {
    for (j = 1; j < TX_SIZES; ++j) {
Yaowu Xu's avatar
Yaowu Xu committed
612 613
      savings += av1_cond_prob_diff_update_savings(&cm->fc->supertx_prob[i][j],
                                                   cm->counts.supertx[i][j]);
614 615 616
    }
  }
  do_update = savings > savings_thresh;
Yaowu Xu's avatar
Yaowu Xu committed
617
  aom_write(w, do_update, GROUP_DIFF_UPDATE_PROB);
618 619 620
  if (do_update) {
    for (i = 0; i < PARTITION_SUPERTX_CONTEXTS; ++i) {
      for (j = 1; j < TX_SIZES; ++j) {
Yaowu Xu's avatar
Yaowu Xu committed
621 622
        av1_cond_prob_diff_update(w, &cm->fc->supertx_prob[i][j],
                                  cm->counts.supertx[i][j]);
623 624 625 626 627 628
      }
    }
  }
}
#endif  // CONFIG_SUPERTX

Yaowu Xu's avatar
Yaowu Xu committed
629
static void pack_mb_tokens(aom_writer *w, const TOKENEXTRA **tp,
630
                           const TOKENEXTRA *const stop,
Yaowu Xu's avatar
Yaowu Xu committed
631
                           aom_bit_depth_t bit_depth, const TX_SIZE tx) {
632
  const TOKENEXTRA *p = *tp;
633 634
#if CONFIG_VAR_TX
  int count = 0;
Debargha Mukherjee's avatar
Debargha Mukherjee committed
635
  const int seg_eob = get_tx2d_size(tx);
636
#endif
Jingning Han's avatar
Jingning Han committed
637 638 639

  while (p < stop && p->token != EOSB_TOKEN) {
    const int t = p->token;
Alex Converse's avatar
Alex Converse committed
640
#if !CONFIG_ANS
Yaowu Xu's avatar
Yaowu Xu committed
641
    const struct av1_token *const a = &av1_coef_encodings[t];
Jingning Han's avatar
Jingning Han committed
642 643
    int v = a->value;
    int n = a->len;
Alex Converse's avatar
Alex Converse committed
644
#endif  // !CONFIG_ANS
Yaowu Xu's avatar
Yaowu Xu committed
645 646 647 648 649 650
#if CONFIG_AOM_HIGHBITDEPTH
    const av1_extra_bit *b;
    if (bit_depth == AOM_BITS_12)
      b = &av1_extra_bits_high12[t];
    else if (bit_depth == AOM_BITS_10)
      b = &av1_extra_bits_high10[t];
Jingning Han's avatar
Jingning Han committed
651
    else
Yaowu Xu's avatar
Yaowu Xu committed
652
      b = &av1_extra_bits[t];
Jingning Han's avatar
Jingning Han committed
653
#else
Yaowu Xu's avatar
Yaowu Xu committed
654
    const av1_extra_bit *const b = &av1_extra_bits[t];
655
    (void)bit_depth;
Yaowu Xu's avatar
Yaowu Xu committed
656
#endif  // CONFIG_AOM_HIGHBITDEPTH
Jingning Han's avatar
Jingning Han committed
657

Alex Converse's avatar
Alex Converse committed
658 659 660 661 662
#if CONFIG_ANS
    /* skip one or two nodes */
    if (!p->skip_eob_node) aom_write(w, t != EOB_TOKEN, p->context_tree[0]);

    if (t != EOB_TOKEN) {
663 664 665
      aom_write(w, t != ZERO_TOKEN, p->context_tree[1]);

      if (t != ZERO_TOKEN) {
666 667
        aom_write_symbol(w, t - ONE_TOKEN, *p->token_cdf,
                         CATEGORY6_TOKEN - ONE_TOKEN + 1);
668
      }
Alex Converse's avatar
Alex Converse committed
669 670
    }
#else
Jingning Han's avatar
Jingning Han committed
671
    /* skip one or two nodes */
672
    if (p->skip_eob_node)
Jingning Han's avatar
Jingning Han committed
673
      n -= p->skip_eob_node;
674
    else
Yaowu Xu's avatar
Yaowu Xu committed
675
      aom_write(w, t != EOB_TOKEN, p->context_tree[0]);
676 677

    if (t != EOB_TOKEN) {
Yaowu Xu's avatar
Yaowu Xu committed
678
      aom_write(w, t != ZERO_TOKEN, p->context_tree[1]);
Jingning Han's avatar
Jingning Han committed
679

680
      if (t != ZERO_TOKEN) {
Yaowu Xu's avatar
Yaowu Xu committed
681
        aom_write(w, t != ONE_TOKEN, p->context_tree[2]);
682 683 684

        if (t != ONE_TOKEN) {
          int len = UNCONSTRAINED_NODES - p->skip_eob_node;
685
          aom_write_tree(w, av1_coef_con_tree,
Yaowu Xu's avatar
Yaowu Xu committed
686 687
                         av1_pareto8_full[p->context_tree[PIVOT_NODE] - 1], v,
                         n - len, 0);
688 689
        }
      }
Jingning Han's avatar
Jingning Han committed
690
    }
Alex Converse's avatar
Alex Converse committed
691
#endif  // CONFIG_ANS
Jingning Han's avatar
Jingning Han committed
692 693 694

    if (b->base_val) {
      const int e = p->extra, l = b->len;
Debargha Mukherjee's avatar
Debargha Mukherjee committed
695 696 697
      int skip_bits = (b->base_val == CAT6_MIN_VAL)
                          ? TX_SIZES - 1 - txsize_sqr_up_map[tx]
                          : 0;
Jingning Han's avatar
Jingning Han committed
698 699 700 701

      if (l) {
        const unsigned char *pb = b->prob;
        int v = e >> 1;
702
        int n = l; /* number of bits in v, assumed nonzero */
Jingning Han's avatar
Jingning Han committed
703 704 705 706
        int i = 0;

        do {
          const int bb = (v >> --n) & 1;
707 708 709 710
          if (skip_bits) {
            skip_bits--;
            assert(!bb);
          } else {
Yaowu Xu's avatar
Yaowu Xu committed
711
            aom_write(w, bb, pb[i >> 1]);
712
          }
Jingning Han's avatar
Jingning Han committed
713 714 715 716
          i = b->tree[i + bb];
        } while (n);
      }

Yaowu Xu's avatar
Yaowu Xu committed
717
      aom_write_bit(w, e & 1);
Jingning Han's avatar
Jingning Han committed
718 719
    }
    ++p;
720 721 722

#if CONFIG_VAR_TX
    ++count;
723
    if (t == EOB_TOKEN || count == seg_eob) break;
724
#endif
Jingning Han's avatar
Jingning Han committed
725 726
  }

727
  *tp = p;
Jingning Han's avatar
Jingning Han committed
728 729
}

730
#if CONFIG_VAR_TX
Yaowu Xu's avatar
Yaowu Xu committed
731
static void pack_txb_tokens(aom_writer *w, const TOKENEXTRA **tp,
732 733
                            const TOKENEXTRA *const tok_end, MACROBLOCKD *xd,
                            MB_MODE_INFO *mbmi, int plane,
Yaowu Xu's avatar
Yaowu Xu committed
734
                            BLOCK_SIZE plane_bsize, aom_bit_depth_t bit_depth,
735 736
                            int block, int blk_row, int blk_col,
                            TX_SIZE tx_size) {
737 738
  const struct macroblockd_plane *const pd = &xd->plane[plane];
  const BLOCK_SIZE bsize = txsize_to_bsize[tx_size];
739 740
  const int tx_row = blk_row >> (1 - pd->subsampling_y);
  const int tx_col = blk_col >> (1 - pd->subsampling_x);
Debargha Mukherjee's avatar
Debargha Mukherjee committed
741
  TX_SIZE plane_tx_size;
742 743 744 745 746 747 748 749
  int max_blocks_high = num_4x4_blocks_high_lookup[plane_bsize];
  int max_blocks_wide = num_4x4_blocks_wide_lookup[plane_bsize];

  if (xd->mb_to_bottom_edge < 0)
    max_blocks_high += xd->mb_to_bottom_edge >> (5 + pd->subsampling_y);
  if (xd->mb_to_right_edge < 0)
    max_blocks_wide += xd->mb_to_right_edge >> (5 + pd->subsampling_x);

750
  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide) return;
751

752 753 754
  plane_tx_size =
      plane ? uv_txsize_lookup[bsize][mbmi->inter_tx_size[tx_row][tx_col]][0][0]
            : mbmi->inter_tx_size[tx_row][tx_col];
Debargha Mukherjee's avatar
Debargha Mukherjee committed
755

756 757 758 759 760 761 762 763 764 765 766 767
  if (tx_size == plane_tx_size) {
    pack_mb_tokens(w, tp, tok_end, bit_depth, tx_size);
  } else {
    int bsl = b_width_log2_lookup[bsize];
    int i;

    assert(bsl > 0);
    --bsl;

    for (i = 0; i < 4; ++i) {
      const int offsetr = blk_row + ((i >> 1) << bsl);
      const int offsetc = blk_col + ((i & 0x01) << bsl);
768
      int step = num_4x4_blocks_txsize_lookup[tx_size - 1];
769

770
      if (offsetr >= max_blocks_high || offsetc >= max_blocks_wide) continue;
771

772 773
      pack_txb_tokens(w, tp, tok_end, xd, mbmi, plane, plane_bsize, bit_depth,
                      block + i * step, offsetr, offsetc, tx_size - 1);
774 775 776 777 778
    }
  }
}
#endif

Yaowu Xu's avatar
Yaowu Xu committed
779
static void write_segment_id(aom_writer *w, const struct segmentation *seg,
780
                             const struct segmentation_probs *segp,
Jingning Han's avatar
Jingning Han committed
781 782
                             int segment_id) {
  if (seg->enabled && seg->update_map)
783
    aom_write_tree(w, av1_segment_tree, segp->tree_probs, segment_id, 3, 0);
Jingning Han's avatar
Jingning Han committed
784 785 786
}

// This function encodes the reference frame
Yaowu Xu's avatar
Yaowu Xu committed
787 788
static void write_ref_frames(const AV1_COMMON *cm, const MACROBLOCKD *xd,
                             aom_writer *w) {
Jingning Han's avatar
Jingning Han committed
789 790 791 792 793 794 795 796 797
  const MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const int is_compound = has_second_ref(mbmi);
  const int segment_id = mbmi->segment_id;