vp9_bitstream.c 74.8 KB
Newer Older
John Koleszar's avatar
John Koleszar committed
1
/*
2
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
John Koleszar's avatar
John Koleszar committed
3
 *
4
 *  Use of this source code is governed by a BSD-style license
5
6
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
7
 *  in the file PATENTS.  All contributing project authors may
8
 *  be found in the AUTHORS file in the root of the source tree.
John Koleszar's avatar
John Koleszar committed
9
10
11
 */


12
#include "vp9/common/vp9_header.h"
13
#include "vp9/encoder/vp9_encodemv.h"
14
15
#include "vp9/common/vp9_entropymode.h"
#include "vp9/common/vp9_findnearmv.h"
16
#include "vp9/encoder/vp9_mcomp.h"
17
#include "vp9/common/vp9_systemdependent.h"
John Koleszar's avatar
John Koleszar committed
18
19
#include <assert.h>
#include <stdio.h>
20
#include <limits.h>
21
#include "vp9/common/vp9_pragmas.h"
22
#include "vpx/vpx_encoder.h"
John Koleszar's avatar
John Koleszar committed
23
#include "vpx_mem/vpx_mem.h"
24
25
#include "vp9/encoder/vp9_bitstream.h"
#include "vp9/encoder/vp9_segmentation.h"
26

27
28
29
30
31
32
#include "vp9/common/vp9_seg_common.h"
#include "vp9/common/vp9_pred_common.h"
#include "vp9/common/vp9_entropy.h"
#include "vp9/encoder/vp9_encodemv.h"
#include "vp9/common/vp9_entropymv.h"
#include "vp9/common/vp9_mvref_common.h"
Paul Wilkins's avatar
Paul Wilkins committed
33

John Koleszar's avatar
John Koleszar committed
34
35
36
37
38
#if defined(SECTIONBITS_OUTPUT)
unsigned __int64 Sectionbits[500];
#endif

#ifdef ENTROPY_STATS
39
40
41
int intra_mode_stats[VP9_KF_BINTRAMODES]
                    [VP9_KF_BINTRAMODES]
                    [VP9_KF_BINTRAMODES];
42
unsigned int tree_update_hist [BLOCK_TYPES]
43
44
45
                              [COEF_BANDS]
                              [PREV_COEF_CONTEXTS]
                              [ENTROPY_NODES][2];
46
47
48
49
unsigned int hybrid_tree_update_hist [BLOCK_TYPES]
                                     [COEF_BANDS]
                                     [PREV_COEF_CONTEXTS]
                                     [ENTROPY_NODES][2];
50
unsigned int tree_update_hist_8x8 [BLOCK_TYPES_8X8]
51
52
53
                                  [COEF_BANDS]
                                  [PREV_COEF_CONTEXTS]
                                  [ENTROPY_NODES] [2];
54
55
56
57
unsigned int hybrid_tree_update_hist_8x8 [BLOCK_TYPES_8X8]
                                         [COEF_BANDS]
                                         [PREV_COEF_CONTEXTS]
                                         [ENTROPY_NODES] [2];
Daniel Kang's avatar
Daniel Kang committed
58
59
60
61
unsigned int tree_update_hist_16x16 [BLOCK_TYPES_16X16]
                                    [COEF_BANDS]
                                    [PREV_COEF_CONTEXTS]
                                    [ENTROPY_NODES] [2];
62
63
64
65
unsigned int hybrid_tree_update_hist_16x16 [BLOCK_TYPES_16X16]
                                           [COEF_BANDS]
                                           [PREV_COEF_CONTEXTS]
                                           [ENTROPY_NODES] [2];
66

John Koleszar's avatar
John Koleszar committed
67
68
69
70
71
72
73
extern unsigned int active_section;
#endif

#ifdef MODE_STATS
int count_mb_seg[4] = { 0, 0, 0, 0 };
#endif

74
75
#define vp9_cost_upd  ((int)(vp9_cost_one(upd) - vp9_cost_zero(upd)) >> 8)
#define vp9_cost_upd256  ((int)(vp9_cost_one(upd) - vp9_cost_zero(upd)))
76
77
78
79

#define SEARCH_NEWP
static int update_bits[255];

John Koleszar's avatar
John Koleszar committed
80
81
82
static void compute_update_table() {
  int i;
  for (i = 0; i < 255; i++)
83
    update_bits[i] = vp9_count_term_subexp(i, SUBEXP_PARAM, 255);
84
85
}

John Koleszar's avatar
John Koleszar committed
86
87
88
89
90
static int split_index(int i, int n, int modulus) {
  int max1 = (n - 1 - modulus / 2) / modulus + 1;
  if (i % modulus == modulus / 2) i = i / modulus;
  else i = max1 + i - (i + modulus - modulus / 2) / modulus;
  return i;
91
92
}

John Koleszar's avatar
John Koleszar committed
93
94
95
96
97
static int remap_prob(int v, int m) {
  const int n = 256;
  const int modulus = MODULUS_PARAM;
  int i;
  if ((m << 1) <= n)
98
    i = vp9_recenter_nonneg(v, m) - 1;
John Koleszar's avatar
John Koleszar committed
99
  else
100
    i = vp9_recenter_nonneg(n - 1 - v, n - 1 - m) - 1;
John Koleszar's avatar
John Koleszar committed
101
102
103

  i = split_index(i, n - 1, modulus);
  return i;
104
}
105

106
107
static void write_prob_diff_update(vp9_writer *const bc,
                                   vp9_prob newp, vp9_prob oldp) {
John Koleszar's avatar
John Koleszar committed
108
  int delp = remap_prob(newp, oldp);
109
  vp9_encode_term_subexp(bc, delp, SUBEXP_PARAM, 255);
110
111
}

112
static int prob_diff_update_cost(vp9_prob newp, vp9_prob oldp) {
John Koleszar's avatar
John Koleszar committed
113
114
  int delp = remap_prob(newp, oldp);
  return update_bits[delp] * 256;
115
}
116

John Koleszar's avatar
John Koleszar committed
117
static void update_mode(
118
  vp9_writer *const bc,
John Koleszar's avatar
John Koleszar committed
119
  int n,
120
121
122
123
  vp9_token tok               [/* n */],
  vp9_tree tree,
  vp9_prob Pnew               [/* n-1 */],
  vp9_prob Pcur               [/* n-1 */],
John Koleszar's avatar
John Koleszar committed
124
125
126
127
128
129
  unsigned int bct            [/* n-1 */] [2],
  const unsigned int num_events[/* n */]
) {
  unsigned int new_b = 0, old_b = 0;
  int i = 0;

130
  vp9_tree_probs_from_distribution(
John Koleszar's avatar
John Koleszar committed
131
132
133
134
135
136
    n--, tok, tree,
    Pnew, bct, num_events,
    256, 1
  );

  do {
137
138
    new_b += cost_branch(bct[i], Pnew[i]);
    old_b += cost_branch(bct[i], Pcur[i]);
John Koleszar's avatar
John Koleszar committed
139
140
141
  } while (++i < n);

  if (new_b + (n << 8) < old_b) {
John Koleszar's avatar
John Koleszar committed
142
143
    int i = 0;

144
    vp9_write_bit(bc, 1);
John Koleszar's avatar
John Koleszar committed
145

John Koleszar's avatar
John Koleszar committed
146
    do {
147
      const vp9_prob p = Pnew[i];
John Koleszar's avatar
John Koleszar committed
148

149
      vp9_write_literal(bc, Pcur[i] = p ? p : 1, 8);
John Koleszar's avatar
John Koleszar committed
150
151
    } while (++i < n);
  } else
152
    vp9_write_bit(bc, 0);
John Koleszar's avatar
John Koleszar committed
153
154
}

155
static void update_mbintra_mode_probs(VP9_COMP* const cpi,
156
                                      vp9_writer* const bc) {
157
  VP9_COMMON *const cm = &cpi->common;
John Koleszar's avatar
John Koleszar committed
158

John Koleszar's avatar
John Koleszar committed
159
  {
160
161
    vp9_prob Pnew   [VP9_YMODES - 1];
    unsigned int bct [VP9_YMODES - 1] [2];
John Koleszar's avatar
John Koleszar committed
162

John Koleszar's avatar
John Koleszar committed
163
    update_mode(
164
      bc, VP9_YMODES, vp9_ymode_encodings, vp9_ymode_tree,
Paul Wilkins's avatar
Paul Wilkins committed
165
      Pnew, cm->fc.ymode_prob, bct, (unsigned int *)cpi->ymode_count
John Koleszar's avatar
John Koleszar committed
166
    );
167
168
169
170
171
#if CONFIG_SUPERBLOCKS
    update_mode(bc, VP9_I32X32_MODES, vp9_sb_ymode_encodings,
                vp9_sb_ymode_tree, Pnew, cm->fc.sb_ymode_prob, bct,
                (unsigned int *)cpi->sb_ymode_count);
#endif
John Koleszar's avatar
John Koleszar committed
172
  }
John Koleszar's avatar
John Koleszar committed
173
174
}

John Koleszar's avatar
John Koleszar committed
175
static int get_prob(int num, int den) {
176
177
178
179
  int p;
  if (den <= 0)
    return 128;
  p = (num * 255 + (den >> 1)) / den;
180
  return clip_prob(p);
181
182
}

John Koleszar's avatar
John Koleszar committed
183
184
185
186
static int get_binary_prob(int n0, int n1) {
  return get_prob(n0, n0 + n1);
}

187
188
void vp9_update_skip_probs(VP9_COMP *cpi) {
  VP9_COMMON *const pc = &cpi->common;
John Koleszar's avatar
John Koleszar committed
189
  int k;
Paul Wilkins's avatar
Paul Wilkins committed
190

John Koleszar's avatar
John Koleszar committed
191
  for (k = 0; k < MBSKIP_CONTEXTS; ++k) {
John Koleszar's avatar
John Koleszar committed
192
193
    pc->mbskip_pred_probs[k] = get_binary_prob(cpi->skip_false_count[k],
                                               cpi->skip_true_count[k]);
John Koleszar's avatar
John Koleszar committed
194
  }
Paul Wilkins's avatar
Paul Wilkins committed
195
196
}

197
static void update_switchable_interp_probs(VP9_COMP *cpi,
198
                                           vp9_writer* const bc) {
199
  VP9_COMMON *const pc = &cpi->common;
200
201
  unsigned int branch_ct[32][2];
  int i, j;
202
  for (j = 0; j <= VP9_SWITCHABLE_FILTERS; ++j) {
203
    vp9_tree_probs_from_distribution(
204
        VP9_SWITCHABLE_FILTERS,
205
        vp9_switchable_interp_encodings, vp9_switchable_interp_tree,
206
207
        pc->fc.switchable_interp_prob[j], branch_ct,
        cpi->switchable_interp_count[j], 256, 1);
208
    for (i = 0; i < VP9_SWITCHABLE_FILTERS - 1; ++i) {
209
210
      if (pc->fc.switchable_interp_prob[j][i] < 1)
        pc->fc.switchable_interp_prob[j][i] = 1;
211
      vp9_write_literal(bc, pc->fc.switchable_interp_prob[j][i], 8);
212
213
214
215
    }
  }
}

216
// This function updates the reference frame prediction stats
217
218
static void update_refpred_stats(VP9_COMP *cpi) {
  VP9_COMMON *const cm = &cpi->common;
John Koleszar's avatar
John Koleszar committed
219
  int i;
220
  vp9_prob new_pred_probs[PREDICTION_PROBS];
John Koleszar's avatar
John Koleszar committed
221
222
223
224
225
226
227
228
229
230
231
232
233
234
  int old_cost, new_cost;

  // Set the prediction probability structures to defaults
  if (cm->frame_type == KEY_FRAME) {
    // Set the prediction probabilities to defaults
    cm->ref_pred_probs[0] = 120;
    cm->ref_pred_probs[1] = 80;
    cm->ref_pred_probs[2] = 40;

    vpx_memset(cpi->ref_pred_probs_update, 0,
               sizeof(cpi->ref_pred_probs_update));
  } else {
    // From the prediction counts set the probabilities for each context
    for (i = 0; i < PREDICTION_PROBS; i++) {
John Koleszar's avatar
John Koleszar committed
235
236
      new_pred_probs[i] = get_binary_prob(cpi->ref_pred_count[i][0],
                                          cpi->ref_pred_count[i][1]);
John Koleszar's avatar
John Koleszar committed
237
238
239
240

      // Decide whether or not to update the reference frame probs.
      // Returned costs are in 1/256 bit units.
      old_cost =
241
242
        (cpi->ref_pred_count[i][0] * vp9_cost_zero(cm->ref_pred_probs[i])) +
        (cpi->ref_pred_count[i][1] * vp9_cost_one(cm->ref_pred_probs[i]));
John Koleszar's avatar
John Koleszar committed
243
244

      new_cost =
245
246
        (cpi->ref_pred_count[i][0] * vp9_cost_zero(new_pred_probs[i])) +
        (cpi->ref_pred_count[i][1] * vp9_cost_one(new_pred_probs[i]));
John Koleszar's avatar
John Koleszar committed
247
248
249
250
251
252
253

      // Cost saving must be >= 8 bits (2048 in these units)
      if ((old_cost - new_cost) >= 2048) {
        cpi->ref_pred_probs_update[i] = 1;
        cm->ref_pred_probs[i] = new_pred_probs[i];
      } else
        cpi->ref_pred_probs_update[i] = 0;
254
255

    }
John Koleszar's avatar
John Koleszar committed
256
  }
257
258
}

259
260
261
262
263
264
// This function is called to update the mode probability context used to encode
// inter modes. It assumes the branch counts table has already been populated
// prior to the actual packing of the bitstream (in rd stage or dummy pack)
//
// The branch counts table is re-populated during the actual pack stage and in
// the decoder to facilitate backwards update of the context.
Jim Bankoski's avatar
Jim Bankoski committed
265
266
static void update_mode_probs(VP9_COMMON *cm,
                              int mode_context[INTER_MODE_CONTEXTS][4]) {
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
  int i, j;
  int (*mv_ref_ct)[4][2];

  vpx_memcpy(mode_context, cm->fc.vp9_mode_contexts,
             sizeof(cm->fc.vp9_mode_contexts));

  mv_ref_ct = cm->fc.mv_ref_ct;

  for (i = 0; i < INTER_MODE_CONTEXTS; i++) {
    for (j = 0; j < 4; j++) {
      int new_prob, count, old_cost, new_cost;

      // Work out cost of coding branches with the old and optimal probability
      old_cost = cost_branch256(mv_ref_ct[i][j], mode_context[i][j]);
      count = mv_ref_ct[i][j][0] + mv_ref_ct[i][j][1];
      new_prob = count > 0 ? (255 * mv_ref_ct[i][j][0]) / count : 128;
      new_prob = (new_prob > 0) ? new_prob : 1;
      new_cost = cost_branch256(mv_ref_ct[i][j], new_prob);

      // If cost saving is >= 14 bits then update the mode probability.
      // This is the approximate net cost of updating one probability given
      // that the no update case ismuch more common than the update case.
      if (new_cost <= (old_cost - (14 << 8))) {
        mode_context[i][j] = new_prob;
      }
    }
  }
}
295
296
static void write_ymode(vp9_writer *bc, int m, const vp9_prob *p) {
  write_token(bc, vp9_ymode_tree, p, vp9_ymode_encodings + m);
John Koleszar's avatar
John Koleszar committed
297
298
}

299
300
static void kfwrite_ymode(vp9_writer *bc, int m, const vp9_prob *p) {
  write_token(bc, vp9_kf_ymode_tree, p, vp9_kf_ymode_encodings + m);
John Koleszar's avatar
John Koleszar committed
301
302
}

Ronald S. Bultje's avatar
Ronald S. Bultje committed
303
#if CONFIG_SUPERBLOCKS
304
305
306
307
static void write_sb_ymode(vp9_writer *bc, int m, const vp9_prob *p) {
  write_token(bc, vp9_sb_ymode_tree, p, vp9_sb_ymode_encodings + m);
}

308
309
static void sb_kfwrite_ymode(vp9_writer *bc, int m, const vp9_prob *p) {
  write_token(bc, vp9_uv_mode_tree, p, vp9_sb_kf_ymode_encodings + m);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
310
311
312
}
#endif

313
314
static void write_i8x8_mode(vp9_writer *bc, int m, const vp9_prob *p) {
  write_token(bc, vp9_i8x8_mode_tree, p, vp9_i8x8_mode_encodings + m);
Yaowu Xu's avatar
Yaowu Xu committed
315
}
Yaowu Xu's avatar
Yaowu Xu committed
316

317
318
static void write_uv_mode(vp9_writer *bc, int m, const vp9_prob *p) {
  write_token(bc, vp9_uv_mode_tree, p, vp9_uv_mode_encodings + m);
John Koleszar's avatar
John Koleszar committed
319
320
321
}


322
static void write_bmode(vp9_writer *bc, int m, const vp9_prob *p) {
323
324
325
326
#if CONFIG_NEWBINTRAMODES
  assert(m < B_CONTEXT_PRED - CONTEXT_PRED_REPLACEMENTS || m == B_CONTEXT_PRED);
  if (m == B_CONTEXT_PRED) m -= CONTEXT_PRED_REPLACEMENTS;
#endif
327
  write_token(bc, vp9_bmode_tree, p, vp9_bmode_encodings + m);
John Koleszar's avatar
John Koleszar committed
328
329
}

330
331
332
333
static void write_kf_bmode(vp9_writer *bc, int m, const vp9_prob *p) {
  write_token(bc, vp9_kf_bmode_tree, p, vp9_kf_bmode_encodings + m);
}

334
static void write_split(vp9_writer *bc, int x, const vp9_prob *p) {
335
336
  write_token(
    bc, vp9_mbsplit_tree, p, vp9_mbsplit_encodings + x);
John Koleszar's avatar
John Koleszar committed
337
338
}

339
static int prob_update_savings(const unsigned int *ct,
340
341
342
343
344
                               const vp9_prob oldp, const vp9_prob newp,
                               const vp9_prob upd) {
  const int old_b = cost_branch256(ct, oldp);
  const int new_b = cost_branch256(ct, newp);
  const int update_b = 2048 + vp9_cost_upd256;
John Koleszar's avatar
John Koleszar committed
345
  return (old_b - new_b - update_b);
346
347
}

348
static int prob_diff_update_savings(const unsigned int *ct,
349
350
351
352
                                    const vp9_prob oldp, const vp9_prob newp,
                                    const vp9_prob upd) {
  const int old_b = cost_branch256(ct, oldp);
  const int new_b = cost_branch256(ct, newp);
John Koleszar's avatar
John Koleszar committed
353
  const int update_b = (newp == oldp ? 0 :
354
                        prob_diff_update_cost(newp, oldp) + vp9_cost_upd256);
John Koleszar's avatar
John Koleszar committed
355
  return (old_b - new_b - update_b);
356
357
358
}

static int prob_diff_update_savings_search(const unsigned int *ct,
359
360
361
                                           const vp9_prob oldp, vp9_prob *bestp,
                                           const vp9_prob upd) {
  const int old_b = cost_branch256(ct, oldp);
John Koleszar's avatar
John Koleszar committed
362
  int new_b, update_b, savings, bestsavings, step;
363
  vp9_prob newp, bestnewp;
John Koleszar's avatar
John Koleszar committed
364
365
366
367
368
369

  bestsavings = 0;
  bestnewp = oldp;

  step = (*bestp > oldp ? -1 : 1);
  for (newp = *bestp; newp != oldp; newp += step) {
370
371
    new_b = cost_branch256(ct, newp);
    update_b = prob_diff_update_cost(newp, oldp) + vp9_cost_upd256;
John Koleszar's avatar
John Koleszar committed
372
373
374
375
    savings = old_b - new_b - update_b;
    if (savings > bestsavings) {
      bestsavings = savings;
      bestnewp = newp;
376
    }
John Koleszar's avatar
John Koleszar committed
377
378
379
  }
  *bestp = bestnewp;
  return bestsavings;
380
381
}

382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
static void vp9_cond_prob_update(vp9_writer *bc, vp9_prob *oldp, vp9_prob upd,
                                 unsigned int *ct) {
  vp9_prob newp;
  int savings;
  newp = get_binary_prob(ct[0], ct[1]);
  savings = prob_update_savings(ct, *oldp, newp, upd);
  if (savings > 0) {
    vp9_write(bc, 1, upd);
    vp9_write_literal(bc, newp, 8);
    *oldp = newp;
  } else {
    vp9_write(bc, 0, upd);
  }
}

397
static void pack_mb_tokens(vp9_writer* const bc,
398
399
                           TOKENEXTRA **tp,
                           const TOKENEXTRA *const stop) {
John Koleszar's avatar
John Koleszar committed
400
401
  unsigned int split;
  unsigned int shift;
John Koleszar's avatar
John Koleszar committed
402
403
404
  int count = bc->count;
  unsigned int range = bc->range;
  unsigned int lowvalue = bc->lowvalue;
405
  TOKENEXTRA *p = *tp;
John Koleszar's avatar
John Koleszar committed
406

John Koleszar's avatar
John Koleszar committed
407
408
  while (p < stop) {
    const int t = p->Token;
409
410
    vp9_token *const a = vp9_coef_encodings + t;
    const vp9_extra_bit_struct *const b = vp9_extra_bits + t;
John Koleszar's avatar
John Koleszar committed
411
412
413
414
415
    int i = 0;
    const unsigned char *pp = p->context_tree;
    int v = a->value;
    int n = a->Len;

416
417
418
419
420
421
    if (t == EOSB_TOKEN)
    {
      ++p;
      break;
    }

John Koleszar's avatar
John Koleszar committed
422
423
424
425
426
    /* skip one or two nodes */
    if (p->skip_eob_node) {
      n -= p->skip_eob_node;
      i = 2 * p->skip_eob_node;
    }
John Koleszar's avatar
John Koleszar committed
427

John Koleszar's avatar
John Koleszar committed
428
429
430
    do {
      const int bb = (v >> --n) & 1;
      split = 1 + (((range - 1) * pp[i >> 1]) >> 8);
431
      i = vp9_coef_tree[i + bb];
John Koleszar's avatar
John Koleszar committed
432

John Koleszar's avatar
John Koleszar committed
433
434
435
436
437
438
      if (bb) {
        lowvalue += split;
        range = range - split;
      } else {
        range = split;
      }
John Koleszar's avatar
John Koleszar committed
439

440
      shift = vp9_norm[range];
John Koleszar's avatar
John Koleszar committed
441
442
      range <<= shift;
      count += shift;
John Koleszar's avatar
John Koleszar committed
443

John Koleszar's avatar
John Koleszar committed
444
445
      if (count >= 0) {
        int offset = shift - count;
John Koleszar's avatar
John Koleszar committed
446

John Koleszar's avatar
John Koleszar committed
447
        if ((lowvalue << (offset - 1)) & 0x80000000) {
John Koleszar's avatar
John Koleszar committed
448
          int x = bc->pos - 1;
John Koleszar's avatar
John Koleszar committed
449

John Koleszar's avatar
John Koleszar committed
450
451
          while (x >= 0 && bc->buffer[x] == 0xff) {
            bc->buffer[x] = (unsigned char)0;
John Koleszar's avatar
John Koleszar committed
452
453
            x--;
          }
John Koleszar's avatar
John Koleszar committed
454

John Koleszar's avatar
John Koleszar committed
455
          bc->buffer[x] += 1;
John Koleszar's avatar
John Koleszar committed
456
        }
John Koleszar's avatar
John Koleszar committed
457

John Koleszar's avatar
John Koleszar committed
458
        bc->buffer[bc->pos++] = (lowvalue >> (24 - offset));
John Koleszar's avatar
John Koleszar committed
459
460
461
462
463
        lowvalue <<= offset;
        shift = count;
        lowvalue &= 0xffffff;
        count -= 8;
      }
John Koleszar's avatar
John Koleszar committed
464

John Koleszar's avatar
John Koleszar committed
465
466
      lowvalue <<= shift;
    } while (n);
John Koleszar's avatar
John Koleszar committed
467
468


John Koleszar's avatar
John Koleszar committed
469
470
    if (b->base_val) {
      const int e = p->Extra, L = b->Len;
John Koleszar's avatar
John Koleszar committed
471

John Koleszar's avatar
John Koleszar committed
472
473
474
475
476
      if (L) {
        const unsigned char *pp = b->prob;
        int v = e >> 1;
        int n = L;              /* number of bits in v, assumed nonzero */
        int i = 0;
John Koleszar's avatar
John Koleszar committed
477

John Koleszar's avatar
John Koleszar committed
478
479
480
481
        do {
          const int bb = (v >> --n) & 1;
          split = 1 + (((range - 1) * pp[i >> 1]) >> 8);
          i = b->tree[i + bb];
John Koleszar's avatar
John Koleszar committed
482

John Koleszar's avatar
John Koleszar committed
483
484
485
486
487
488
          if (bb) {
            lowvalue += split;
            range = range - split;
          } else {
            range = split;
          }
John Koleszar's avatar
John Koleszar committed
489

490
          shift = vp9_norm[range];
John Koleszar's avatar
John Koleszar committed
491
492
          range <<= shift;
          count += shift;
John Koleszar's avatar
John Koleszar committed
493

John Koleszar's avatar
John Koleszar committed
494
495
          if (count >= 0) {
            int offset = shift - count;
John Koleszar's avatar
John Koleszar committed
496

John Koleszar's avatar
John Koleszar committed
497
            if ((lowvalue << (offset - 1)) & 0x80000000) {
John Koleszar's avatar
John Koleszar committed
498
              int x = bc->pos - 1;
John Koleszar's avatar
John Koleszar committed
499

John Koleszar's avatar
John Koleszar committed
500
501
              while (x >= 0 && bc->buffer[x] == 0xff) {
                bc->buffer[x] = (unsigned char)0;
John Koleszar's avatar
John Koleszar committed
502
503
504
                x--;
              }

John Koleszar's avatar
John Koleszar committed
505
              bc->buffer[x] += 1;
John Koleszar's avatar
John Koleszar committed
506
507
            }

John Koleszar's avatar
John Koleszar committed
508
            bc->buffer[bc->pos++] = (lowvalue >> (24 - offset));
John Koleszar's avatar
John Koleszar committed
509
510
511
512
513
            lowvalue <<= offset;
            shift = count;
            lowvalue &= 0xffffff;
            count -= 8;
          }
John Koleszar's avatar
John Koleszar committed
514

John Koleszar's avatar
John Koleszar committed
515
516
517
          lowvalue <<= shift;
        } while (n);
      }
John Koleszar's avatar
John Koleszar committed
518
519


John Koleszar's avatar
John Koleszar committed
520
      {
John Koleszar's avatar
John Koleszar committed
521

John Koleszar's avatar
John Koleszar committed
522
        split = (range + 1) >> 1;
John Koleszar's avatar
John Koleszar committed
523

John Koleszar's avatar
John Koleszar committed
524
525
526
527
528
529
        if (e & 1) {
          lowvalue += split;
          range = range - split;
        } else {
          range = split;
        }
John Koleszar's avatar
John Koleszar committed
530

John Koleszar's avatar
John Koleszar committed
531
        range <<= 1;
John Koleszar's avatar
John Koleszar committed
532

John Koleszar's avatar
John Koleszar committed
533
        if ((lowvalue & 0x80000000)) {
John Koleszar's avatar
John Koleszar committed
534
          int x = bc->pos - 1;
John Koleszar's avatar
John Koleszar committed
535

John Koleszar's avatar
John Koleszar committed
536
537
          while (x >= 0 && bc->buffer[x] == 0xff) {
            bc->buffer[x] = (unsigned char)0;
John Koleszar's avatar
John Koleszar committed
538
539
            x--;
          }
John Koleszar's avatar
John Koleszar committed
540

John Koleszar's avatar
John Koleszar committed
541
          bc->buffer[x] += 1;
John Koleszar's avatar
John Koleszar committed
542

John Koleszar's avatar
John Koleszar committed
543
        }
John Koleszar's avatar
John Koleszar committed
544

John Koleszar's avatar
John Koleszar committed
545
546
547
548
        lowvalue  <<= 1;

        if (!++count) {
          count = -8;
John Koleszar's avatar
John Koleszar committed
549
          bc->buffer[bc->pos++] = (lowvalue >> 24);
John Koleszar's avatar
John Koleszar committed
550
          lowvalue &= 0xffffff;
John Koleszar's avatar
John Koleszar committed
551
        }
John Koleszar's avatar
John Koleszar committed
552
      }
John Koleszar's avatar
John Koleszar committed
553
554

    }
John Koleszar's avatar
John Koleszar committed
555
556
557
    ++p;
  }

John Koleszar's avatar
John Koleszar committed
558
559
560
  bc->count = count;
  bc->lowvalue = lowvalue;
  bc->range = range;
561
  *tp = p;
John Koleszar's avatar
John Koleszar committed
562
563
}

John Koleszar's avatar
John Koleszar committed
564
565
static void write_partition_size(unsigned char *cx_data, int size) {
  signed char csize;
John Koleszar's avatar
John Koleszar committed
566

John Koleszar's avatar
John Koleszar committed
567
568
569
570
571
572
  csize = size & 0xff;
  *cx_data = csize;
  csize = (size >> 8) & 0xff;
  *(cx_data + 1) = csize;
  csize = (size >> 16) & 0xff;
  *(cx_data + 2) = csize;
John Koleszar's avatar
John Koleszar committed
573
574
575
576
577

}

static void write_mv_ref
(
578
  vp9_writer *bc, MB_PREDICTION_MODE m, const vp9_prob *p
John Koleszar's avatar
John Koleszar committed
579
) {
580
#if CONFIG_DEBUG
John Koleszar's avatar
John Koleszar committed
581
  assert(NEARESTMV <= m  &&  m <= SPLITMV);
582
#endif
583
584
  write_token(bc, vp9_mv_ref_tree, p,
              vp9_mv_ref_encoding_array - NEARESTMV + m);
John Koleszar's avatar
John Koleszar committed
585
586
}

Ronald S. Bultje's avatar
Ronald S. Bultje committed
587
#if CONFIG_SUPERBLOCKS
588
589
static void write_sb_mv_ref(vp9_writer *bc, MB_PREDICTION_MODE m,
                            const vp9_prob *p) {
Ronald S. Bultje's avatar
Ronald S. Bultje committed
590
591
592
#if CONFIG_DEBUG
  assert(NEARESTMV <= m  &&  m < SPLITMV);
#endif
593
594
  write_token(bc, vp9_sb_mv_ref_tree, p,
              vp9_sb_mv_ref_encoding_array - NEARESTMV + m);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
595
596
597
}
#endif

John Koleszar's avatar
John Koleszar committed
598
599
static void write_sub_mv_ref
(
600
  vp9_writer *bc, B_PREDICTION_MODE m, const vp9_prob *p
John Koleszar's avatar
John Koleszar committed
601
) {
602
#if CONFIG_DEBUG
John Koleszar's avatar
John Koleszar committed
603
  assert(LEFT4X4 <= m  &&  m <= NEW4X4);
604
#endif
605
606
  write_token(bc, vp9_sub_mv_ref_tree, p,
              vp9_sub_mv_ref_encoding_array - LEFT4X4 + m);
John Koleszar's avatar
John Koleszar committed
607
608
}

609
static void write_nmv(vp9_writer *bc, const MV *mv, const int_mv *ref,
John Koleszar's avatar
John Koleszar committed
610
                      const nmv_context *nmvc, int usehp) {
611
612
613
614
  MV e;
  e.row = mv->row - ref->as_mv.row;
  e.col = mv->col - ref->as_mv.col;

615
616
  vp9_encode_nmv(bc, &e, &ref->as_mv, nmvc);
  vp9_encode_nmv_fp(bc, &e, &ref->as_mv, nmvc, usehp);
617
618
}

619
#if CONFIG_NEW_MVREF
620
621
static void vp9_write_mv_ref_id(vp9_writer *w,
                                vp9_prob * ref_id_probs,
622
623
624
625
                                int mv_ref_id) {
  // Encode the index for the MV reference.
  switch (mv_ref_id) {
    case 0:
626
      vp9_write(w, 0, ref_id_probs[0]);
627
628
      break;
    case 1:
629
630
      vp9_write(w, 1, ref_id_probs[0]);
      vp9_write(w, 0, ref_id_probs[1]);
631
632
      break;
    case 2:
633
634
635
      vp9_write(w, 1, ref_id_probs[0]);
      vp9_write(w, 1, ref_id_probs[1]);
      vp9_write(w, 0, ref_id_probs[2]);
636
637
      break;
    case 3:
638
639
640
      vp9_write(w, 1, ref_id_probs[0]);
      vp9_write(w, 1, ref_id_probs[1]);
      vp9_write(w, 1, ref_id_probs[2]);
641
642
643
644
645
646
647
648
649
650
      break;

      // TRAP.. This should not happen
    default:
      assert(0);
      break;
  }
}
#endif

Paul Wilkins's avatar
Paul Wilkins committed
651
652
// This function writes the current macro block's segnment id to the bitstream
// It should only be called if a segment map update is indicated.
653
static void write_mb_segid(vp9_writer *bc,
Paul Wilkins's avatar
Paul Wilkins committed
654
                           const MB_MODE_INFO *mi, const MACROBLOCKD *xd) {
John Koleszar's avatar
John Koleszar committed
655
  // Encode the MB segment id.
Ronald S. Bultje's avatar
Ronald S. Bultje committed
656
657
658
  int seg_id = mi->segment_id;
#if CONFIG_SUPERBLOCKS
  if (mi->encoded_as_sb) {
659
    if (xd->mb_to_right_edge >= 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
660
      seg_id = seg_id && xd->mode_info_context[1].mbmi.segment_id;
661
    if (xd->mb_to_bottom_edge >= 0) {
Ronald S. Bultje's avatar
Ronald S. Bultje committed
662
663
      seg_id = seg_id &&
               xd->mode_info_context[xd->mode_info_stride].mbmi.segment_id;
664
      if (xd->mb_to_right_edge >= 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
665
666
667
668
669
        seg_id = seg_id &&
                xd->mode_info_context[xd->mode_info_stride + 1].mbmi.segment_id;
    }
  }
#endif
Paul Wilkins's avatar
Paul Wilkins committed
670
  if (xd->segmentation_enabled && xd->update_mb_segmentation_map) {
Ronald S. Bultje's avatar
Ronald S. Bultje committed
671
    switch (seg_id) {
John Koleszar's avatar
John Koleszar committed
672
      case 0:
673
674
        vp9_write(bc, 0, xd->mb_segment_tree_probs[0]);
        vp9_write(bc, 0, xd->mb_segment_tree_probs[1]);
John Koleszar's avatar
John Koleszar committed
675
676
        break;
      case 1:
677
678
        vp9_write(bc, 0, xd->mb_segment_tree_probs[0]);
        vp9_write(bc, 1, xd->mb_segment_tree_probs[1]);
John Koleszar's avatar
John Koleszar committed
679
680
        break;
      case 2:
681
682
        vp9_write(bc, 1, xd->mb_segment_tree_probs[0]);
        vp9_write(bc, 0, xd->mb_segment_tree_probs[2]);
John Koleszar's avatar
John Koleszar committed
683
684
        break;
      case 3:
685
686
        vp9_write(bc, 1, xd->mb_segment_tree_probs[0]);
        vp9_write(bc, 1, xd->mb_segment_tree_probs[2]);
John Koleszar's avatar
John Koleszar committed
687
688
689
690
        break;

        // TRAP.. This should not happen
      default:
691
692
        vp9_write(bc, 0, xd->mb_segment_tree_probs[0]);
        vp9_write(bc, 0, xd->mb_segment_tree_probs[1]);
John Koleszar's avatar
John Koleszar committed
693
        break;
John Koleszar's avatar
John Koleszar committed
694
    }
John Koleszar's avatar
John Koleszar committed
695
  }
John Koleszar's avatar
John Koleszar committed
696
697
}

Paul Wilkins's avatar
Paul Wilkins committed
698
// This function encodes the reference frame
699
static void encode_ref_frame(vp9_writer *const bc,
700
                             VP9_COMMON *const cm,
John Koleszar's avatar
John Koleszar committed
701
702
703
704
705
                             MACROBLOCKD *xd,
                             int segment_id,
                             MV_REFERENCE_FRAME rf) {
  int seg_ref_active;
  int seg_ref_count = 0;
706
707
708
  seg_ref_active = vp9_segfeature_active(xd,
                                         segment_id,
                                         SEG_LVL_REF_FRAME);
John Koleszar's avatar
John Koleszar committed
709
710

  if (seg_ref_active) {
711
712
713
714
    seg_ref_count = vp9_check_segref(xd, segment_id, INTRA_FRAME) +
                    vp9_check_segref(xd, segment_id, LAST_FRAME) +
                    vp9_check_segref(xd, segment_id, GOLDEN_FRAME) +
                    vp9_check_segref(xd, segment_id, ALTREF_FRAME);
John Koleszar's avatar
John Koleszar committed
715
716
717
718
719
720
721
  }

  // If segment level coding of this signal is disabled...
  // or the segment allows multiple reference frame options
  if (!seg_ref_active || (seg_ref_count > 1)) {
    // Values used in prediction model coding
    unsigned char prediction_flag;
722
    vp9_prob pred_prob;
John Koleszar's avatar
John Koleszar committed
723
724
725
    MV_REFERENCE_FRAME pred_rf;

    // Get the context probability the prediction flag
Paul Wilkins's avatar
Paul Wilkins committed
726
    pred_prob = vp9_get_pred_prob(cm, xd, PRED_REF);
John Koleszar's avatar
John Koleszar committed
727
728

    // Get the predicted value.
Paul Wilkins's avatar
Paul Wilkins committed
729
    pred_rf = vp9_get_pred_ref(cm, xd);
John Koleszar's avatar
John Koleszar committed
730
731
732
733
734

    // Did the chosen reference frame match its predicted value.
    prediction_flag =
      (xd->mode_info_context->mbmi.ref_frame == pred_rf);

Paul Wilkins's avatar
Paul Wilkins committed
735
    vp9_set_pred_flag(xd, PRED_REF, prediction_flag);
736
    vp9_write(bc, prediction_flag, pred_prob);
John Koleszar's avatar
John Koleszar committed
737
738
739

    // If not predicted correctly then code value explicitly
    if (!prediction_flag) {
740
      vp9_prob mod_refprobs[PREDICTION_PROBS];
John Koleszar's avatar
John Koleszar committed
741
742
743
744
745
746
747
748

      vpx_memcpy(mod_refprobs,
                 cm->mod_refprobs[pred_rf], sizeof(mod_refprobs));

      // If segment coding enabled blank out options that cant occur by
      // setting the branch probability to 0.
      if (seg_ref_active) {
        mod_refprobs[INTRA_FRAME] *=
749
          vp9_check_segref(xd, segment_id, INTRA_FRAME);
John Koleszar's avatar
John Koleszar committed
750
        mod_refprobs[LAST_FRAME] *=
751
          vp9_check_segref(xd, segment_id, LAST_FRAME);
John Koleszar's avatar
John Koleszar committed
752
        mod_refprobs[GOLDEN_FRAME] *=
753
754
          (vp9_check_segref(xd, segment_id, GOLDEN_FRAME) *
           vp9_check_segref(xd, segment_id, ALTREF_FRAME));
John Koleszar's avatar
John Koleszar committed
755
756
757
      }

      if (mod_refprobs[0]) {
758
        vp9_write(bc, (rf != INTRA_FRAME), mod_refprobs[0]);
John Koleszar's avatar
John Koleszar committed
759
760
761
762
763
      }

      // Inter coded
      if (rf != INTRA_FRAME) {
        if (mod_refprobs[1]) {
764
          vp9_write(bc, (rf != LAST_FRAME), mod_refprobs[1]);
John Koleszar's avatar
John Koleszar committed
765
        }
766

John Koleszar's avatar
John Koleszar committed
767
768
        if (rf != LAST_FRAME) {
          if (mod_refprobs[2]) {
769
            vp9_write(bc, (rf != GOLDEN_FRAME), mod_refprobs[2]);
John Koleszar's avatar
John Koleszar committed
770
          }
771
        }
John Koleszar's avatar
John Koleszar committed
772
      }
Paul Wilkins's avatar
Paul Wilkins committed
773
    }
John Koleszar's avatar
John Koleszar committed
774
  }
Paul Wilkins's avatar
Paul Wilkins committed
775

John Koleszar's avatar
John Koleszar committed
776
777
  // if using the prediction mdoel we have nothing further to do because
  // the reference frame is fully coded by the segment
Paul Wilkins's avatar
Paul Wilkins committed
778
}
John Koleszar's avatar
John Koleszar committed
779

780
// Update the probabilities used to encode reference frame data
781
782
static void update_ref_probs(VP9_COMP *const cpi) {
  VP9_COMMON *const cm = &cpi->common;
783

John Koleszar's avatar
John Koleszar committed
784
785
786
787
  const int *const rfct = cpi->count_mb_ref_frame_usage;
  const int rf_intra = rfct[INTRA_FRAME];
  const int rf_inter = rfct[LAST_FRAME] +
                       rfct[GOLDEN_FRAME] + rfct[ALTREF_FRAME];
788

John Koleszar's avatar
John Koleszar committed
789
790
791
  cm->prob_intra_coded = get_binary_prob(rf_intra, rf_inter);
  cm->prob_last_coded = get_prob(rfct[LAST_FRAME], rf_inter);
  cm->prob_gf_coded = get_binary_prob(rfct[GOLDEN_FRAME], rfct[ALTREF_FRAME]);
792

John Koleszar's avatar
John Koleszar committed
793
794
  // Compute a modified set of probabilities to use when prediction of the
  // reference frame fails
Paul Wilkins's avatar
Paul Wilkins committed
795
  vp9_compute_mod_refprobs(cm);
796
797
}

798
static void pack_inter_mode_mvs(VP9_COMP *const cpi, vp9_writer *const bc) {
799
  VP9_COMMON *const pc = &cpi->common;
800
  const nmv_context *nmvc = &pc->fc.nmvc;
Paul Wilkins's avatar
Paul Wilkins committed
801
  MACROBLOCK *x = &cpi->mb;
John Koleszar's avatar
John Koleszar committed
802
803
804
  MACROBLOCKD *xd = &cpi->mb.e_mbd;
  MODE_INFO *m;
  MODE_INFO *prev_m;
805
806
  TOKENEXTRA *tok = cpi->tok;
  TOKENEXTRA *tok_end = tok + cpi->tok_count;
807

John Koleszar's avatar
John Koleszar committed
808
809
810
  const int mis = pc->mode_info_stride;
  int mb_row, mb_col;
  int row, col;
John Koleszar's avatar
John Koleszar committed
811

John Koleszar's avatar
John Koleszar committed
812
  // Values used in prediction model coding
813
  vp9_prob pred_prob;
John Koleszar's avatar
John Koleszar committed
814
  unsigned char prediction_flag;
815

John Koleszar's avatar
John Koleszar committed
816
817
  int row_delta[4] = { 0, +1,  0, -1};
  int col_delta[4] = { +1, -1, +1, +1};
Adrian Grange's avatar
Adrian Grange committed
818

John Koleszar's avatar
John Koleszar committed
819
  cpi->mb.partition_info = cpi->mb.pi;
820

John Koleszar's avatar
John Koleszar committed
821
822
823
824
825
826
827
828
829
830
831
  mb_row = 0;
  for (row = 0; row < pc->mb_rows; row += 2) {
    m = pc->mi + row * mis;
    prev_m = pc->prev_mi + row * mis;

    mb_col = 0;
    for (col = 0; col < pc->mb_cols; col += 2) {
      int i;

      // Process the 4 MBs in the order:
      // top-left, top-right, bottom-left, bottom-right
Ronald S. Bultje's avatar
Ronald S. Bultje committed
832
#if CONFIG_SUPERBLOCKS
833
      vp9_write(bc, m->mbmi.encoded_as_sb, pc->sb_coded);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
834
#endif
John Koleszar's avatar
John Koleszar committed
835
836
837
      for (i = 0; i < 4; i++) {
        MB_MODE_INFO *mi;
        MV_REFERENCE_FRAME rf;
Deb Mukherjee's avatar
Deb Mukherjee committed
838
        MV_REFERENCE_FRAME sec_ref_frame;
John Koleszar's avatar
John Koleszar committed
839
        MB_PREDICTION_MODE mode;
840
        int segment_id, skip_coeff;
John Koleszar's avatar
John Koleszar committed
841
842
843
844
845
846
847
848
849
850
851
852
853
854

        int dy = row_delta[i];
        int dx = col_delta[i];
        int offset_extended = dy * mis + dx;

        if ((mb_row >= pc->mb_rows) || (mb_col >= pc->mb_cols)) {
          // MB lies outside frame, move on
          mb_row += dy;
          mb_col += dx;
          m += offset_extended;
          prev_m += offset_extended;
          cpi->mb.partition_info += offset_extended;
          continue;
        }
Adrian Grange's avatar
Adrian Grange committed
855

John Koleszar's avatar
John Koleszar committed
856
        mi = &m->mbmi;
John Koleszar's avatar
John Koleszar committed
857
        rf = mi->ref_frame;
Deb Mukherjee's avatar
Deb Mukherjee committed
858
        sec_ref_frame = mi->second_ref_frame;
John Koleszar's avatar
John Koleszar committed
859
860
        mode = mi->mode;
        segment_id = mi->segment_id;
861

John Koleszar's avatar
John Koleszar committed
862
863
864
865
866
        // Distance of Mb to the various image edges.
        // These specified to 8th pel as they are always compared to MV
        // values that are in 1/8th pel units
        xd->mb_to_left_edge = -((mb_col * 16) << 3);
        xd->mb_to_top_edge = -((mb_row * 16)) << 3;
867
868
869
870
871
872
873
874
875
876
877
878

#if CONFIG_SUPERBLOCKS
        if (mi->encoded_as_sb) {
          xd->mb_to_right_edge = ((pc->mb_cols - 2 - mb_col) * 16) << 3;
          xd->mb_to_bottom_edge = ((pc->mb_rows - 2 - mb_row) * 16) << 3;
        } else {
#endif
          xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;
          xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
#if CONFIG_SUPERBLOCKS
        }
#endif
879

John Koleszar's avatar
John Koleszar committed
880
881
882
        // Make sure the MacroBlockD mode info pointer is set correctly
        xd->mode_info_context = m;
        xd->prev_mode_info_context = prev_m;
Paul Wilkins's avatar
Paul Wilkins committed
883

John Koleszar's avatar
John Koleszar committed
884
#ifdef ENTROPY_STATS
John Koleszar's avatar
John Koleszar committed
885
        active_section = 9;
John Koleszar's avatar
John Koleszar committed
886
#endif
John Koleszar's avatar
John Koleszar committed
887
888
889
        if (cpi->mb.e_mbd.update_mb_segmentation_map) {
          // Is temporal coding of the segment map enabled
          if (pc->temporal_update) {
Paul Wilkins's avatar
Paul Wilkins committed
890
891
            prediction_flag = vp9_get_pred_flag(xd, PRED_SEG_ID);
            pred_prob = vp9_get_pred_prob(pc, xd, PRED_SEG_ID);
892

John Koleszar's avatar
John Koleszar committed
893
            // Code the segment id prediction flag for this mb
894
            vp9_write(bc, prediction_flag, pred_prob);
895

John Koleszar's avatar
John Koleszar committed
896
897
            // If the mb segment id wasn't predicted code explicitly
            if (!prediction_flag)
John Koleszar's avatar
John Koleszar committed
898
              write_mb_segid(bc, mi, &cpi->mb.e_mbd);
John Koleszar's avatar
John Koleszar committed
899
900
          } else {
            // Normal unpredicted coding
John Koleszar's avatar
John Koleszar committed
901
            write_mb_segid(bc, mi, &cpi->mb.e_mbd);
John Koleszar's avatar
John Koleszar committed
902
903
          }
        }
John Koleszar's avatar
John Koleszar committed
904

905
        skip_coeff = 1;
John Koleszar's avatar
John Koleszar committed
906
        if (pc->mb_no_coeff_skip &&
907
908
            (!vp9_segfeature_active(xd, segment_id, SEG_LVL_EOB) ||
             (vp9_get_segdata(xd, segment_id, SEG_LVL_EOB) != 0))) {
909
          skip_coeff = mi->mb_skip_coeff;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
910
911
912
913
914
915
916
#if CONFIG_SUPERBLOCKS
          if (mi->encoded_as_sb) {
            skip_coeff &= m[1].mbmi.mb_skip_coeff;
            skip_coeff &= m[mis].mbmi.mb_skip_coeff;
            skip_coeff &= m[mis + 1].mbmi.mb_skip_coeff;
          }
#endif
917
918
          vp9_write(bc, skip_coeff,
                    vp9_get_pred_prob(pc, xd, PRED_MBSKIP));
John Koleszar's avatar
John Koleszar committed
919
        }
John Koleszar's avatar
John Koleszar committed
920

John Koleszar's avatar
John Koleszar committed
921
        // Encode the reference frame.
922
923
924
925
926
927
        if (!vp9_segfeature_active(xd, segment_id, SEG_LVL_MODE)
            || vp9_get_segdata(xd, segment_id, SEG_LVL_MODE) >= NEARESTMV) {
          encode_ref_frame(bc, pc, xd, segment_id, rf);
        } else {
          assert(rf == INTRA_FRAME);
        }
Paul Wilkins's avatar
Paul Wilkins committed
928

John Koleszar's avatar
John Koleszar committed
929
        if (rf == INTRA_FRAME) {
930
#ifdef ENTROPY_STATS
John Koleszar's avatar
John Koleszar committed
931
          active_section = 6;
932
#endif
Paul Wilkins's avatar
Paul Wilkins committed
933

934
          if (!vp9_segfeature_active(xd, segment_id, SEG_LVL_MODE)) {
935
936
937
938
939
#if CONFIG_SUPERBLOCKS
            if (m->mbmi.encoded_as_sb)
              write_sb_ymode(bc, mode, pc->fc.sb_ymode_prob);
            else
#endif
John Koleszar's avatar
John Koleszar committed
940
            write_ymode(bc, mode, pc->fc.ymode_prob);
John Koleszar's avatar
John Koleszar committed
941
942
943