vp9_decodemv.c 25.5 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 <assert.h>

13 14
#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_entropy.h"
15
#include "vp9/common/vp9_entropymode.h"
16
#include "vp9/common/vp9_entropymv.h"
17
#include "vp9/common/vp9_findnearmv.h"
18
#include "vp9/common/vp9_mvref_common.h"
19
#include "vp9/common/vp9_pred_common.h"
20 21 22
#include "vp9/common/vp9_reconinter.h"
#include "vp9/common/vp9_seg_common.h"

23
#include "vp9/decoder/vp9_decodemv.h"
24
#include "vp9/decoder/vp9_decodframe.h"
25
#include "vp9/decoder/vp9_onyxd_int.h"
26
#include "vp9/decoder/vp9_dsubexp.h"
27 28
#include "vp9/decoder/vp9_treereader.h"

John Koleszar's avatar
John Koleszar committed
29
// #define DEBUG_DEC_MV
30 31 32
#ifdef DEBUG_DEC_MV
int dec_mvcount = 0;
#endif
Dmitry Kovalev's avatar
Dmitry Kovalev committed
33

34 35 36 37
// #define DEC_DEBUG
#ifdef DEC_DEBUG
extern int dec_debug;
#endif
38

39
static MB_PREDICTION_MODE read_intra_mode(vp9_reader *r, const vp9_prob *p) {
40 41 42 43 44
  return (MB_PREDICTION_MODE)treed_read(r, vp9_intra_mode_tree, p);
}

static MB_PREDICTION_MODE read_inter_mode(vp9_reader *r, const vp9_prob *p) {
  return (MB_PREDICTION_MODE)treed_read(r, vp9_sb_mv_ref_tree, p);
45 46
}

47 48
static int read_segment_id(vp9_reader *r, const struct segmentation *seg) {
  return treed_read(r, vp9_segment_tree, seg->tree_probs);
Scott LaVarnway's avatar
Scott LaVarnway committed
49
}
50

51 52
static TX_SIZE read_selected_txfm_size(VP9_COMMON *cm, MACROBLOCKD *xd,
                                       BLOCK_SIZE_TYPE bsize, vp9_reader *r) {
53 54
  const int context = vp9_get_pred_context_tx_size(xd);
  const vp9_prob *tx_probs = vp9_get_pred_probs_tx_size(xd, &cm->fc.tx_probs);
55 56 57 58 59 60 61 62
  TX_SIZE txfm_size = vp9_read(r, tx_probs[0]);
  if (txfm_size != TX_4X4 && bsize >= BLOCK_SIZE_MB16X16) {
    txfm_size += vp9_read(r, tx_probs[1]);
    if (txfm_size != TX_8X8 && bsize >= BLOCK_SIZE_SB32X32)
      txfm_size += vp9_read(r, tx_probs[2]);
  }

  if (bsize >= BLOCK_SIZE_SB32X32)
63
    cm->fc.tx_counts.p32x32[context][txfm_size]++;
64
  else if (bsize >= BLOCK_SIZE_MB16X16)
65
    cm->fc.tx_counts.p16x16[context][txfm_size]++;
66
  else
67
    cm->fc.tx_counts.p8x8[context][txfm_size]++;
68 69 70 71

  return txfm_size;
}

72 73 74
static TX_SIZE read_txfm_size(VP9D_COMP *pbi, TXFM_MODE txfm_mode,
                              BLOCK_SIZE_TYPE bsize, int select_cond,
                              vp9_reader *r) {
75 76 77 78
  VP9_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;

  if (txfm_mode == TX_MODE_SELECT && bsize >= BLOCK_SIZE_SB8X8 && select_cond)
79
    return read_selected_txfm_size(cm, xd, bsize, r);
80 81 82 83 84 85 86 87 88 89
  else if (txfm_mode >= ALLOW_32X32 && bsize >= BLOCK_SIZE_SB32X32)
    return TX_32X32;
  else if (txfm_mode >= ALLOW_16X16 && bsize >= BLOCK_SIZE_MB16X16)
    return TX_16X16;
  else if (txfm_mode >= ALLOW_8X8 && bsize >= BLOCK_SIZE_SB8X8)
    return TX_8X8;
  else
    return TX_4X4;
}

90
static void set_segment_id(VP9_COMMON *cm, BLOCK_SIZE_TYPE bsize,
91
                           int mi_row, int mi_col, int segment_id) {
92 93 94
  const int mi_offset = mi_row * cm->mi_cols + mi_col;
  const int bw = 1 << mi_width_log2(bsize);
  const int bh = 1 << mi_height_log2(bsize);
95
  const int xmis = MIN(cm->mi_cols - mi_col, bw);
96
  const int ymis = MIN(cm->mi_rows - mi_row, bh);
97 98
  int x, y;

99 100 101 102 103 104 105 106 107 108
  assert(segment_id >= 0 && segment_id < MAX_MB_SEGMENTS);

  for (y = 0; y < ymis; y++)
    for (x = 0; x < xmis; x++)
      cm->last_frame_seg_map[mi_offset + y * cm->mi_cols + x] = segment_id;
}

static int read_intra_segment_id(VP9D_COMP *pbi, int mi_row, int mi_col,
                                 vp9_reader *r) {
  MACROBLOCKD *const xd = &pbi->mb;
109
  struct segmentation *const seg = &xd->seg;
110
  const BLOCK_SIZE_TYPE bsize = xd->mode_info_context->mbmi.sb_type;
111
  int segment_id;
112

113 114 115 116
  if (!seg->enabled)
    return 0;  // Default for disabled segmentation

  if (!seg->update_map)
117
    return 0;
118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142

  segment_id = read_segment_id(r, seg);
  set_segment_id(&pbi->common, bsize, mi_row, mi_col, segment_id);
  return segment_id;
}

static int read_inter_segment_id(VP9D_COMP *pbi, int mi_row, int mi_col,
                                 vp9_reader *r) {
  VP9_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
  struct segmentation *const seg = &xd->seg;
  const BLOCK_SIZE_TYPE bsize = xd->mode_info_context->mbmi.sb_type;
  int pred_segment_id, segment_id;

  if (!seg->enabled)
    return 0;  // Default for disabled segmentation

  pred_segment_id = vp9_get_segment_id(cm, cm->last_frame_seg_map,
                                       bsize, mi_row, mi_col);
  if (!seg->update_map)
    return pred_segment_id;

  if (seg->temporal_update) {
    const vp9_prob pred_prob = vp9_get_pred_prob_seg_id(xd);
    const int pred_flag = vp9_read(r, pred_prob);
143
    vp9_set_pred_flag_seg_id(cm, bsize, mi_row, mi_col, pred_flag);
144 145 146 147
    segment_id = pred_flag ? pred_segment_id
                           : read_segment_id(r, seg);
  } else {
    segment_id = read_segment_id(r, seg);
148
  }
149 150
  set_segment_id(cm, bsize, mi_row, mi_col, segment_id);
  return segment_id;
151 152
}

153
static uint8_t read_skip_coeff(VP9D_COMP *pbi, int segment_id, vp9_reader *r) {
154
  VP9_COMMON *const cm = &pbi->common;
155
  MACROBLOCKD *const xd = &pbi->mb;
156
  int skip_coeff = vp9_segfeature_active(&xd->seg, segment_id, SEG_LVL_SKIP);
157
  if (!skip_coeff) {
158
    const int ctx = vp9_get_pred_context_mbskip(xd);
159
    skip_coeff = vp9_read(r, vp9_get_pred_prob_mbskip(cm, xd));
160
    cm->fc.mbskip_count[ctx][skip_coeff]++;
Deb Mukherjee's avatar
Deb Mukherjee committed
161
  }
162 163
  return skip_coeff;
}
John Koleszar's avatar
John Koleszar committed
164

165 166 167 168 169 170 171
static void read_intra_mode_info(VP9D_COMP *pbi, MODE_INFO *m,
                                 int mi_row, int mi_col, vp9_reader *r) {
  VP9_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
  MB_MODE_INFO *const mbmi = &m->mbmi;
  const BLOCK_SIZE_TYPE bsize = mbmi->sb_type;
  const int mis = cm->mode_info_stride;
172

173 174
  mbmi->segment_id = read_intra_segment_id(pbi, mi_row, mi_col, r);
  mbmi->mb_skip_coeff = read_skip_coeff(pbi, mbmi->segment_id, r);
175
  mbmi->txfm_size = read_txfm_size(pbi, cm->txfm_mode, bsize, 1, r);
176 177 178
  mbmi->ref_frame[0] = INTRA_FRAME;

  if (bsize >= BLOCK_SIZE_SB8X8) {
179 180 181
    const MB_PREDICTION_MODE A = above_block_mode(m, 0, mis);
    const MB_PREDICTION_MODE L = xd->left_available ?
                                  left_block_mode(m, 0) : DC_PRED;
182
    mbmi->mode = read_intra_mode(r, cm->kf_y_mode_prob[A][L]);
183
  } else {
184 185 186
    // Only 4x4, 4x8, 8x4 blocks
    const int bw = 1 << b_width_log2(bsize);
    const int bh = 1 << b_height_log2(bsize);
187
    int idx, idy;
188 189 190

    for (idy = 0; idy < 2; idy += bh) {
      for (idx = 0; idx < 2; idx += bw) {
191
        const int ib = idy * 2 + idx;
192 193 194
        const MB_PREDICTION_MODE A = above_block_mode(m, ib, mis);
        const MB_PREDICTION_MODE L = (xd->left_available || idx) ?
                                      left_block_mode(m, ib) : DC_PRED;
195 196
        const MB_PREDICTION_MODE b_mode = read_intra_mode(r,
                                              cm->kf_y_mode_prob[A][L]);
197
        m->bmi[ib].as_mode = b_mode;
198
        if (bh == 2)
199
          m->bmi[ib + 2].as_mode = b_mode;
200
        if (bw == 2)
201
          m->bmi[ib + 1].as_mode = b_mode;
202 203
      }
    }
204

205
    mbmi->mode = m->bmi[3].as_mode;
John Koleszar's avatar
John Koleszar committed
206
  }
Dmitry Kovalev's avatar
Dmitry Kovalev committed
207

208
  mbmi->uv_mode = read_intra_mode(r, cm->kf_uv_mode_prob[mbmi->mode]);
Scott LaVarnway's avatar
Scott LaVarnway committed
209
}
John Koleszar's avatar
John Koleszar committed
210

211 212
static int read_mv_component(vp9_reader *r,
                             const nmv_component *mvcomp, int usehp) {
213

214
  int mag, d, fr, hp;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
215 216
  const int sign = vp9_read(r, mvcomp->sign);
  const int mv_class = treed_read(r, vp9_mv_class_tree, mvcomp->classes);
217
  const int class0 = mv_class == MV_CLASS_0;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
218

219
  // Integer part
220
  if (class0) {
221
    d = treed_read(r, vp9_mv_class0_tree, mvcomp->class0);
222
  } else {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
223
    int i;
224
    const int n = mv_class + CLASS0_BITS - 1;  // number of bits
Dmitry Kovalev's avatar
Dmitry Kovalev committed
225

226
    d = 0;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
227 228
    for (i = 0; i < n; ++i)
      d |= vp9_read(r, mvcomp->bits[i]) << i;
229 230
  }

231 232
  // Fractional part
  fr = treed_read(r, vp9_mv_fp_tree,
233
                  class0 ? mvcomp->class0_fp[d] : mvcomp->fp);
234 235


236
  // High precision part (if hp is not used, the default value of the hp is 1)
237
  hp = usehp ? vp9_read(r, class0 ? mvcomp->class0_hp : mvcomp->hp)
238
             : 1;
239

240
  // Result
241 242
  mag = vp9_get_mv_mag(mv_class, (d << 3) | (fr << 1) | hp) + 1;
  return sign ? -mag : mag;
243 244
}

245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263
static INLINE void read_mv(vp9_reader *r, MV *mv, const MV *ref,
                           const nmv_context *ctx,
                           nmv_context_counts *counts, int usehp) {
  const MV_JOINT_TYPE j = treed_read(r, vp9_mv_joint_tree, ctx->joints);
  MV diff = {0, 0};

  usehp = usehp && vp9_use_mv_hp(ref);
  if (mv_joint_vertical(j))
    diff.row = read_mv_component(r, &ctx->comps[0], usehp);

  if (mv_joint_horizontal(j))
    diff.col = read_mv_component(r, &ctx->comps[1], usehp);

  vp9_inc_mv(&diff, ref, counts, usehp);

  mv->row = ref->row + diff.row;
  mv->col = ref->col + diff.col;
}

264
static void update_mv(vp9_reader *r, vp9_prob *p, vp9_prob upd_p) {
265
  if (vp9_read(r, upd_p)) {
266
#ifdef LOW_PRECISION_MV_UPDATE
267
    *p = (vp9_read_literal(r, 7) << 1) | 1;
268
#else
269
    *p = vp9_read_literal(r, 8);
270 271 272 273
#endif
  }
}

Dmitry Kovalev's avatar
Dmitry Kovalev committed
274
static void read_mv_probs(vp9_reader *r, nmv_context *mvc, int usehp) {
275
  int i, j, k;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
276

277
#ifdef MV_GROUP_UPDATE
278
  if (!vp9_read_bit(r))
Dmitry Kovalev's avatar
Dmitry Kovalev committed
279
    return;
280
#endif
281

Dmitry Kovalev's avatar
Dmitry Kovalev committed
282
  for (j = 0; j < MV_JOINTS - 1; ++j)
Dmitry Kovalev's avatar
Dmitry Kovalev committed
283
    update_mv(r, &mvc->joints[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
284

285
  for (i = 0; i < 2; ++i) {
286 287 288
    nmv_component *const comp = &mvc->comps[i];

    update_mv(r, &comp->sign, VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
289
    for (j = 0; j < MV_CLASSES - 1; ++j)
290
      update_mv(r, &comp->classes[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
291 292

    for (j = 0; j < CLASS0_SIZE - 1; ++j)
293
      update_mv(r, &comp->class0[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
294 295

    for (j = 0; j < MV_OFFSET_BITS; ++j)
296
      update_mv(r, &comp->bits[j], VP9_NMV_UPDATE_PROB);
297 298 299
  }

  for (i = 0; i < 2; ++i) {
300 301
    nmv_component *const comp = &mvc->comps[i];

302
    for (j = 0; j < CLASS0_SIZE; ++j)
303
      for (k = 0; k < 3; ++k)
304
        update_mv(r, &comp->class0_fp[j][k], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
305 306

    for (j = 0; j < 3; ++j)
307
      update_mv(r, &comp->fp[j], VP9_NMV_UPDATE_PROB);
308 309 310 311
  }

  if (usehp) {
    for (i = 0; i < 2; ++i) {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
312 313
      update_mv(r, &mvc->comps[i].class0_hp, VP9_NMV_UPDATE_PROB);
      update_mv(r, &mvc->comps[i].hp, VP9_NMV_UPDATE_PROB);
314 315 316 317
    }
  }
}

318
// Read the referncence frame
Ronald S. Bultje's avatar
Ronald S. Bultje committed
319 320
static void read_ref_frame(VP9D_COMP *pbi, vp9_reader *r,
                           int segment_id, MV_REFERENCE_FRAME ref_frame[2]) {
321
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
322
  MACROBLOCKD *const xd = &pbi->mb;
323
  FRAME_CONTEXT *const fc = &cm->fc;
324

325 326
  if (vp9_segfeature_active(&xd->seg, segment_id, SEG_LVL_REF_FRAME)) {
    ref_frame[0] = vp9_get_segdata(&xd->seg, segment_id, SEG_LVL_REF_FRAME);
327 328
    ref_frame[1] = NONE;
  } else {
329
    const int comp_ctx = vp9_get_pred_context_comp_inter_inter(cm, xd);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
330
    int is_comp;
John Koleszar's avatar
John Koleszar committed
331

Ronald S. Bultje's avatar
Ronald S. Bultje committed
332
    if (cm->comp_pred_mode == HYBRID_PREDICTION) {
333 334
      is_comp = vp9_read(r, fc->comp_inter_prob[comp_ctx]);
      fc->comp_inter_count[comp_ctx][is_comp]++;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
335 336 337
    } else {
      is_comp = cm->comp_pred_mode == COMP_PREDICTION_ONLY;
    }
John Koleszar's avatar
John Koleszar committed
338

Ronald S. Bultje's avatar
Ronald S. Bultje committed
339 340
    // FIXME(rbultje) I'm pretty sure this breaks segmentation ref frame coding
    if (is_comp) {
341
      const int fix_ref_idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
342
      const int ref_ctx = vp9_get_pred_context_comp_ref_p(cm, xd);
343 344 345
      const int b = vp9_read(r, fc->comp_ref_prob[ref_ctx]);
      fc->comp_ref_count[ref_ctx][b]++;
      ref_frame[fix_ref_idx] = cm->comp_fixed_ref;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
346
      ref_frame[!fix_ref_idx] = cm->comp_var_ref[b];
Dmitry Kovalev's avatar
Dmitry Kovalev committed
347
    } else {
348
      const int ref1_ctx = vp9_get_pred_context_single_ref_p1(cm, xd);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
349
      ref_frame[1] = NONE;
350
      if (vp9_read(r, fc->single_ref_prob[ref1_ctx][0])) {
351
        const int ref2_ctx = vp9_get_pred_context_single_ref_p2(cm, xd);
352 353 354 355
        const int b = vp9_read(r, fc->single_ref_prob[ref2_ctx][1]);
        ref_frame[0] = b ? ALTREF_FRAME : GOLDEN_FRAME;
        fc->single_ref_count[ref1_ctx][0][1]++;
        fc->single_ref_count[ref2_ctx][1][b]++;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
356 357
      } else {
        ref_frame[0] = LAST_FRAME;
358
        fc->single_ref_count[ref1_ctx][0][0]++;
John Koleszar's avatar
John Koleszar committed
359
      }
360
    }
John Koleszar's avatar
John Koleszar committed
361
  }
362
}
John Koleszar's avatar
John Koleszar committed
363

364
static void read_switchable_interp_probs(FRAME_CONTEXT *fc, vp9_reader *r) {
365
  int i, j;
366 367 368
  for (j = 0; j < VP9_SWITCHABLE_FILTERS + 1; ++j)
    for (i = 0; i < VP9_SWITCHABLE_FILTERS - 1; ++i)
      if (vp9_read(r, VP9_MODE_UPDATE_PROB))
369
        vp9_diff_update_prob(r, &fc->switchable_interp_prob[j][i]);
370 371
}

372
static void read_inter_mode_probs(FRAME_CONTEXT *fc, vp9_reader *r) {
373 374
  int i, j;
  for (i = 0; i < INTER_MODE_CONTEXTS; ++i)
375 376
    for (j = 0; j < VP9_INTER_MODES - 1; ++j)
      if (vp9_read(r, VP9_MODE_UPDATE_PROB))
377
        vp9_diff_update_prob(r, &fc->inter_mode_probs[i][j]);
378
}
John Koleszar's avatar
John Koleszar committed
379

380 381 382
static INLINE COMPPREDMODE_TYPE read_comp_pred_mode(vp9_reader *r) {
  COMPPREDMODE_TYPE mode = vp9_read_bit(r);
  if (mode)
383
    mode += vp9_read_bit(r);
384 385 386
  return mode;
}

Dmitry Kovalev's avatar
Dmitry Kovalev committed
387 388 389 390 391 392 393 394 395 396
static INLINE void assign_and_clamp_mv(int_mv *dst, const int_mv *src,
                                       int mb_to_left_edge,
                                       int mb_to_right_edge,
                                       int mb_to_top_edge,
                                       int mb_to_bottom_edge) {
  dst->as_int = src->as_int;
  clamp_mv(dst, mb_to_left_edge, mb_to_right_edge, mb_to_top_edge,
           mb_to_bottom_edge);
}

397
static INLINE INTERPOLATIONFILTERTYPE read_switchable_filter_type(
398
    VP9D_COMP *pbi, vp9_reader *r) {
399 400
  VP9_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
401
  const vp9_prob *probs = vp9_get_pred_probs_switchable_interp(cm, xd);
402
  const int index = treed_read(r, vp9_switchable_interp_tree, probs);
403
  const int ctx = vp9_get_pred_context_switchable_interp(cm, xd);
404
  ++cm->fc.switchable_interp_count[ctx][index];
405 406 407
  return vp9_switchable_interp[index];
}

408
static void read_intra_block_modes(VP9D_COMP *pbi, MODE_INFO *mi,
409
                                   vp9_reader *r) {
410
  VP9_COMMON *const cm = &pbi->common;
411
  MB_MODE_INFO *const mbmi = &mi->mbmi;
412
  const BLOCK_SIZE_TYPE bsize = mi->mbmi.sb_type;
413
  const int bwl = b_width_log2(bsize), bhl = b_height_log2(bsize);
414 415

  if (bsize >= BLOCK_SIZE_SB8X8) {
416 417 418
    const int size_group = MIN(3, MIN(bwl, bhl));
    mbmi->mode = read_intra_mode(r, cm->fc.y_mode_prob[size_group]);
    cm->fc.y_mode_counts[size_group][mbmi->mode]++;
419
  } else {
420 421
     // Only 4x4, 4x8, 8x4 blocks
     const int bw = 1 << bwl, bh = 1 << bhl;
422
     int idx, idy;
423

424 425
     for (idy = 0; idy < 2; idy += bh) {
       for (idx = 0; idx < 2; idx += bw) {
426 427
         const int ib = idy * 2 + idx;
         const int b_mode = read_intra_mode(r, cm->fc.y_mode_prob[0]);
428
         mi->bmi[ib].as_mode = b_mode;
429 430 431
         cm->fc.y_mode_counts[0][b_mode]++;

         if (bh == 2)
432
           mi->bmi[ib + 2].as_mode = b_mode;
433
         if (bw == 2)
434
           mi->bmi[ib + 1].as_mode = b_mode;
435 436
      }
    }
437
    mbmi->mode = mi->bmi[3].as_mode;
438 439 440 441 442 443 444 445 446 447 448 449
  }

  mbmi->uv_mode = read_intra_mode(r, cm->fc.uv_mode_prob[mbmi->mode]);
  cm->fc.uv_mode_counts[mbmi->mode][mbmi->uv_mode]++;
}

static MV_REFERENCE_FRAME read_reference_frame(VP9D_COMP *pbi, int segment_id,
                                               vp9_reader *r) {
  VP9_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;

  MV_REFERENCE_FRAME ref;
450
  if (!vp9_segfeature_active(&xd->seg, segment_id, SEG_LVL_REF_FRAME)) {
451
    const int ctx = vp9_get_pred_context_intra_inter(cm, xd);
452
    ref = (MV_REFERENCE_FRAME)
453
              vp9_read(r, vp9_get_pred_prob_intra_inter(cm, xd));
454 455
    cm->fc.intra_inter_count[ctx][ref != INTRA_FRAME]++;
  } else {
456 457
    ref = (MV_REFERENCE_FRAME) vp9_get_segdata(&xd->seg, segment_id,
                                   SEG_LVL_REF_FRAME) != INTRA_FRAME;
458 459 460 461
  }
  return ref;
}

462 463
static void read_inter_mode_info(VP9D_COMP *pbi, MODE_INFO *mi,
                                 int mi_row, int mi_col, vp9_reader *r) {
464
  VP9_COMMON *const cm = &pbi->common;
465
  MACROBLOCKD *const xd = &pbi->mb;
466
  nmv_context *const nmvc = &cm->fc.nmvc;
467
  MB_MODE_INFO *const mbmi = &mi->mbmi;
John Koleszar's avatar
John Koleszar committed
468

469 470
  int_mv *const mv0 = &mbmi->mv[0];
  int_mv *const mv1 = &mbmi->mv[1];
471 472 473
  const BLOCK_SIZE_TYPE bsize = mi->mbmi.sb_type;
  const int bw = 1 << b_width_log2(bsize);
  const int bh = 1 << b_height_log2(bsize);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
474

475
  int idx, idy;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
476

477
  mbmi->segment_id = read_inter_segment_id(pbi, mi_row, mi_col, r);
478
  mbmi->mb_skip_coeff = read_skip_coeff(pbi, mbmi->segment_id, r);
479
  mbmi->ref_frame[0] = read_reference_frame(pbi, mbmi->segment_id, r);
480 481 482
  mbmi->ref_frame[1] = NONE;
  mbmi->txfm_size = read_txfm_size(pbi, cm->txfm_mode, bsize,
     (!mbmi->mb_skip_coeff || mbmi->ref_frame[0] == INTRA_FRAME), r);
483

Ronald S. Bultje's avatar
Ronald S. Bultje committed
484
  if (mbmi->ref_frame[0] != INTRA_FRAME) {
John Koleszar's avatar
John Koleszar committed
485 486
    int_mv nearest, nearby, best_mv;
    int_mv nearest_second, nearby_second, best_mv_second;
487
    vp9_prob *mv_ref_p;
488
    MV_REFERENCE_FRAME ref0, ref1;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
489 490

    read_ref_frame(pbi, r, mbmi->segment_id, mbmi->ref_frame);
491 492
    ref0 = mbmi->ref_frame[0];
    ref1 = mbmi->ref_frame[1];
493

494
#ifdef DEC_DEBUG
495 496 497
    if (dec_debug)
      printf("%d %d\n", xd->mode_info_context->mbmi.mv[0].as_mv.row,
             xd->mode_info_context->mbmi.mv[0].as_mv.col);
498
#endif
499 500
    vp9_find_mv_refs(cm, xd, mi, xd->prev_mode_info_context,
                     ref0, mbmi->ref_mvs[ref0], cm->ref_frame_sign_bias);
501

502
    mv_ref_p = cm->fc.inter_mode_probs[mbmi->mb_mode_context[ref0]];
503

504
    if (vp9_segfeature_active(&xd->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
505 506 507 508 509 510 511 512 513 514 515 516
      mbmi->mode = ZEROMV;
    } else if (bsize >= BLOCK_SIZE_SB8X8) {
      mbmi->mode = read_inter_mode(r, mv_ref_p);
      vp9_accum_mv_refs(cm, mbmi->mode, mbmi->mb_mode_context[ref0]);
    }
    mbmi->uv_mode = DC_PRED;

    // nearest, nearby
    if (bsize < BLOCK_SIZE_SB8X8 || mbmi->mode != ZEROMV) {
      vp9_find_best_ref_mvs(xd, mbmi->ref_mvs[ref0], &nearest, &nearby);
      best_mv.as_int = mbmi->ref_mvs[ref0][0].as_int;
    }
517

518
#ifdef DEC_DEBUG
519 520 521 522
    if (dec_debug)
      printf("[D %d %d] %d %d %d %d\n", ref_frame,
             mbmi->mb_mode_context[ref_frame],
             mv_ref_p[0], mv_ref_p[1], mv_ref_p[2], mv_ref_p[3]);
523
#endif
John Koleszar's avatar
John Koleszar committed
524

525 526 527
    mbmi->interp_filter = cm->mcomp_filter_type == SWITCHABLE
                              ? read_switchable_filter_type(pbi, r)
                              : cm->mcomp_filter_type;
528

529
    if (ref1 > INTRA_FRAME) {
Ronald S. Bultje's avatar
Ronald S. Bultje committed
530
      vp9_find_mv_refs(cm, xd, mi, xd->prev_mode_info_context,
531
                       ref1, mbmi->ref_mvs[ref1], cm->ref_frame_sign_bias);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
532 533

      if (bsize < BLOCK_SIZE_SB8X8 || mbmi->mode != ZEROMV) {
534 535 536
        vp9_find_best_ref_mvs(xd, mbmi->ref_mvs[ref1],
                              &nearest_second, &nearby_second);
        best_mv_second.as_int = mbmi->ref_mvs[ref1][0].as_int;
537
      }
John Koleszar's avatar
John Koleszar committed
538
    }
539

540

Ronald S. Bultje's avatar
Ronald S. Bultje committed
541 542 543 544
    if (mbmi->sb_type < BLOCK_SIZE_SB8X8) {
      for (idy = 0; idy < 2; idy += bh) {
        for (idx = 0; idx < 2; idx += bw) {
          int_mv blockmv, secondmv;
545
          const int j = idy * 2 + idx;
546
          const int blockmode = read_inter_mode(r, mv_ref_p);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
547

548
          vp9_accum_mv_refs(cm, blockmode, mbmi->mb_mode_context[ref0]);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
549 550
          if (blockmode == NEARESTMV || blockmode == NEARMV) {
            vp9_append_sub8x8_mvs_for_idx(cm, xd, &nearest, &nearby, j, 0);
551
            if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
552 553 554
              vp9_append_sub8x8_mvs_for_idx(cm, xd,  &nearest_second,
                                            &nearby_second, j, 1);
          }
555

Ronald S. Bultje's avatar
Ronald S. Bultje committed
556 557
          switch (blockmode) {
            case NEWMV:
558 559
              read_mv(r, &blockmv.as_mv, &best_mv.as_mv, nmvc,
                      &cm->fc.NMVcount, xd->allow_high_precision_mv);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
560

561
              if (ref1 > 0)
562 563
                read_mv(r, &secondmv.as_mv, &best_mv_second.as_mv, nmvc,
                        &cm->fc.NMVcount, xd->allow_high_precision_mv);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
564 565 566
              break;
            case NEARESTMV:
              blockmv.as_int = nearest.as_int;
567
              if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
568 569 570 571
                secondmv.as_int = nearest_second.as_int;
              break;
            case NEARMV:
              blockmv.as_int = nearby.as_int;
572
              if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
573 574 575 576
                secondmv.as_int = nearby_second.as_int;
              break;
            case ZEROMV:
              blockmv.as_int = 0;
577
              if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
578 579 580
                secondmv.as_int = 0;
              break;
            default:
581
              assert(!"Invalid inter mode value");
John Koleszar's avatar
John Koleszar committed
582
          }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
583
          mi->bmi[j].as_mv[0].as_int = blockmv.as_int;
584
          if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
585 586
            mi->bmi[j].as_mv[1].as_int = secondmv.as_int;

587
          if (bh == 2)
588
            mi->bmi[j + 2] = mi->bmi[j];
589
          if (bw == 2)
590
            mi->bmi[j + 1] = mi->bmi[j];
Ronald S. Bultje's avatar
Ronald S. Bultje committed
591
          mi->mbmi.mode = blockmode;
592
        }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
593
      }
John Koleszar's avatar
John Koleszar committed
594

Ronald S. Bultje's avatar
Ronald S. Bultje committed
595 596 597
      mv0->as_int = mi->bmi[3].as_mv[0].as_int;
      mv1->as_int = mi->bmi[3].as_mv[1].as_int;
    } else {
598 599 600 601 602
      const int mb_to_top_edge = xd->mb_to_top_edge - LEFT_TOP_MARGIN;
      const int mb_to_bottom_edge = xd->mb_to_bottom_edge + RIGHT_BOTTOM_MARGIN;
      const int mb_to_left_edge = xd->mb_to_left_edge - LEFT_TOP_MARGIN;
      const int mb_to_right_edge = xd->mb_to_right_edge + RIGHT_BOTTOM_MARGIN;

Ronald S. Bultje's avatar
Ronald S. Bultje committed
603 604 605 606 607 608 609
      switch (mbmi->mode) {
        case NEARMV:
          // Clip "next_nearest" so that it does not extend to far out of image
          assign_and_clamp_mv(mv0, &nearby, mb_to_left_edge,
                                            mb_to_right_edge,
                                            mb_to_top_edge,
                                            mb_to_bottom_edge);
610
          if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
611 612 613 614 615 616 617 618 619 620 621 622
            assign_and_clamp_mv(mv1, &nearby_second, mb_to_left_edge,
                                                     mb_to_right_edge,
                                                     mb_to_top_edge,
                                                     mb_to_bottom_edge);
          break;

        case NEARESTMV:
          // Clip "next_nearest" so that it does not extend to far out of image
          assign_and_clamp_mv(mv0, &nearest, mb_to_left_edge,
                                             mb_to_right_edge,
                                             mb_to_top_edge,
                                             mb_to_bottom_edge);
623
          if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
624 625 626 627 628 629 630 631
            assign_and_clamp_mv(mv1, &nearest_second, mb_to_left_edge,
                                                      mb_to_right_edge,
                                                      mb_to_top_edge,
                                                      mb_to_bottom_edge);
          break;

        case ZEROMV:
          mv0->as_int = 0;
632
          if (ref1 > 0)
Ronald S. Bultje's avatar
Ronald S. Bultje committed
633 634 635 636
            mv1->as_int = 0;
          break;

        case NEWMV:
637 638
          read_mv(r, &mv0->as_mv, &best_mv.as_mv, nmvc, &cm->fc.NMVcount,
                  xd->allow_high_precision_mv);
639
          if (ref1 > 0)
640 641
            read_mv(r, &mv1->as_mv, &best_mv_second.as_mv, nmvc,
                    &cm->fc.NMVcount, xd->allow_high_precision_mv);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
642 643
          break;
        default:
644
          assert(!"Invalid inter mode value");
Ronald S. Bultje's avatar
Ronald S. Bultje committed
645
      }
Scott LaVarnway's avatar
Scott LaVarnway committed
646
    }
John Koleszar's avatar
John Koleszar committed
647
  } else {
648
    mv0->as_int = 0;  // required for left and above block mv
649
    read_intra_block_modes(pbi, mi, r);
John Koleszar's avatar
John Koleszar committed
650
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
651
}
John Koleszar's avatar
John Koleszar committed
652

653 654
void vp9_prepare_read_mode_info(VP9D_COMP* pbi, vp9_reader *r) {
  VP9_COMMON *const cm = &pbi->common;
655
  int k;
656

657
  // TODO(jkoleszar): does this clear more than MBSKIP_CONTEXTS? Maybe remove.
Deb Mukherjee's avatar
Deb Mukherjee committed
658
  // vpx_memset(cm->fc.mbskip_probs, 0, sizeof(cm->fc.mbskip_probs));
659 660
  for (k = 0; k < MBSKIP_CONTEXTS; ++k)
    if (vp9_read(r, VP9_MODE_UPDATE_PROB))
661
      vp9_diff_update_prob(r, &cm->fc.mbskip_probs[k]);
662

663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
  if (cm->frame_type != KEY_FRAME && !cm->intra_only) {
    nmv_context *const nmvc = &pbi->common.fc.nmvc;
    MACROBLOCKD *const xd = &pbi->mb;
    int i, j;

    read_inter_mode_probs(&cm->fc, r);

    if (cm->mcomp_filter_type == SWITCHABLE)
      read_switchable_interp_probs(&cm->fc, r);

    for (i = 0; i < INTRA_INTER_CONTEXTS; i++)
      if (vp9_read(r, VP9_MODE_UPDATE_PROB))
        vp9_diff_update_prob(r, &cm->fc.intra_inter_prob[i]);

    if (cm->allow_comp_inter_inter) {
      cm->comp_pred_mode = read_comp_pred_mode(r);
      if (cm->comp_pred_mode == HYBRID_PREDICTION)
        for (i = 0; i < COMP_INTER_CONTEXTS; i++)
          if (vp9_read(r, VP9_MODE_UPDATE_PROB))
            vp9_diff_update_prob(r, &cm->fc.comp_inter_prob[i]);
    } else {
      cm->comp_pred_mode = SINGLE_PREDICTION_ONLY;
    }

    if (cm->comp_pred_mode != COMP_PREDICTION_ONLY)
      for (i = 0; i < REF_CONTEXTS; i++) {
        if (vp9_read(r, VP9_MODE_UPDATE_PROB))
          vp9_diff_update_prob(r, &cm->fc.single_ref_prob[i][0]);

        if (vp9_read(r, VP9_MODE_UPDATE_PROB))
          vp9_diff_update_prob(r, &cm->fc.single_ref_prob[i][1]);
      }

    if (cm->comp_pred_mode != SINGLE_PREDICTION_ONLY)
      for (i = 0; i < REF_CONTEXTS; i++)
        if (vp9_read(r, VP9_MODE_UPDATE_PROB))
          vp9_diff_update_prob(r, &cm->fc.comp_ref_prob[i]);

    // VP9_INTRA_MODES
    for (j = 0; j < BLOCK_SIZE_GROUPS; j++)
      for (i = 0; i < VP9_INTRA_MODES - 1; ++i)
        if (vp9_read(r, VP9_MODE_UPDATE_PROB))
          vp9_diff_update_prob(r, &cm->fc.y_mode_prob[j][i]);

    for (j = 0; j < NUM_PARTITION_CONTEXTS; ++j)
      for (i = 0; i < PARTITION_TYPES - 1; ++i)
        if (vp9_read(r, VP9_MODE_UPDATE_PROB))
          vp9_diff_update_prob(r, &cm->fc.partition_prob[INTER_FRAME][j][i]);

    read_mv_probs(r, nmvc, xd->allow_high_precision_mv);
  }
714
}
715

716
void vp9_read_mode_info(VP9D_COMP* pbi, int mi_row, int mi_col, vp9_reader *r) {
717
  VP9_COMMON *const cm = &pbi->common;
718
  MACROBLOCKD *const xd = &pbi->mb;
719
  MODE_INFO *mi = xd->mode_info_context;
720
  const BLOCK_SIZE_TYPE bsize = mi->mbmi.sb_type;
Jim Bankoski's avatar
Jim Bankoski committed
721 722 723 724 725
  const int bw = 1 << mi_width_log2(bsize);
  const int bh = 1 << mi_height_log2(bsize);
  const int y_mis = MIN(bh, cm->mi_rows - mi_row);
  const int x_mis = MIN(bw, cm->mi_cols - mi_col);
  int x, y;
726

727 728 729 730
  if (cm->frame_type == KEY_FRAME || cm->intra_only)
    read_intra_mode_info(pbi, mi, mi_row, mi_col, r);
  else
    read_inter_mode_info(pbi, mi, mi_row, mi_col, r);
731

Jim Bankoski's avatar
Jim Bankoski committed
732 733 734
  for (y = 0; y < y_mis; y++)
    for (x = !y; x < x_mis; x++)
      mi[y * cm->mode_info_stride + x] = *mi;
735
}