vp9_decodemv.c 44.2 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/decoder/vp9_treereader.h"
13 14
#include "vp9/common/vp9_entropymv.h"
#include "vp9/common/vp9_entropymode.h"
15
#include "vp9/decoder/vp9_onyxd_int.h"
16
#include "vp9/common/vp9_findnearmv.h"
Ronald S. Bultje's avatar
Ronald S. Bultje committed
17
#include "vp9/common/vp9_common.h"
18 19 20 21 22
#include "vp9/common/vp9_seg_common.h"
#include "vp9/common/vp9_pred_common.h"
#include "vp9/common/vp9_entropy.h"
#include "vp9/decoder/vp9_decodemv.h"
#include "vp9/common/vp9_mvref_common.h"
John Koleszar's avatar
John Koleszar committed
23 24 25
#if CONFIG_DEBUG
#include <assert.h>
#endif
26

John Koleszar's avatar
John Koleszar committed
27
// #define DEBUG_DEC_MV
28 29 30
#ifdef DEBUG_DEC_MV
int dec_mvcount = 0;
#endif
31 32 33 34
// #define DEC_DEBUG
#ifdef DEC_DEBUG
extern int dec_debug;
#endif
35

36
static int read_bmode(vp9_reader *bc, const vp9_prob *p) {
37 38 39 40 41 42 43 44 45 46 47
  B_PREDICTION_MODE m = treed_read(bc, vp9_bmode_tree, p);
#if CONFIG_NEWBINTRAMODES
  if (m == B_CONTEXT_PRED - CONTEXT_PRED_REPLACEMENTS)
    m = B_CONTEXT_PRED;
  assert(m < B_CONTEXT_PRED - CONTEXT_PRED_REPLACEMENTS || m == B_CONTEXT_PRED);
#endif
  return m;
}

static int read_kf_bmode(vp9_reader *bc, const vp9_prob *p) {
  return treed_read(bc, vp9_kf_bmode_tree, p);
Scott LaVarnway's avatar
Scott LaVarnway committed
48 49
}

50 51
static int read_ymode(vp9_reader *bc, const vp9_prob *p) {
  return treed_read(bc, vp9_ymode_tree, p);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
52
}
Scott LaVarnway's avatar
Scott LaVarnway committed
53

Ronald S. Bultje's avatar
Ronald S. Bultje committed
54
#if CONFIG_SUPERBLOCKS
55 56 57 58
static int read_sb_ymode(vp9_reader *bc, const vp9_prob *p) {
  return treed_read(bc, vp9_sb_ymode_tree, p);
}

59 60
static int read_kf_sb_ymode(vp9_reader *bc, const vp9_prob *p) {
  return treed_read(bc, vp9_uv_mode_tree, p);
Scott LaVarnway's avatar
Scott LaVarnway committed
61
}
Ronald S. Bultje's avatar
Ronald S. Bultje committed
62
#endif
Scott LaVarnway's avatar
Scott LaVarnway committed
63

64 65
static int read_kf_mb_ymode(vp9_reader *bc, const vp9_prob *p) {
  return treed_read(bc, vp9_kf_ymode_tree, p);
Scott LaVarnway's avatar
Scott LaVarnway committed
66 67
}

68 69
static int read_i8x8_mode(vp9_reader *bc, const vp9_prob *p) {
  return treed_read(bc, vp9_i8x8_mode_tree, p);
Yaowu Xu's avatar
Yaowu Xu committed
70
}
Scott LaVarnway's avatar
Scott LaVarnway committed
71

72 73
static int read_uv_mode(vp9_reader *bc, const vp9_prob *p) {
  return treed_read(bc, vp9_uv_mode_tree, p);
Scott LaVarnway's avatar
Scott LaVarnway committed
74 75
}

76
// This function reads the current macro block's segnent id from the bitstream
Paul Wilkins's avatar
Paul Wilkins committed
77
// It should only be called if a segment map update is indicated.
78 79
static void read_mb_segid(vp9_reader *r, MB_MODE_INFO *mi,
                          MACROBLOCKD *xd) {
John Koleszar's avatar
John Koleszar committed
80
  /* Is segmentation enabled */
Paul Wilkins's avatar
Paul Wilkins committed
81
  if (xd->segmentation_enabled && xd->update_mb_segmentation_map) {
John Koleszar's avatar
John Koleszar committed
82
    /* If so then read the segment id. */
83
    if (vp9_read(r, xd->mb_segment_tree_probs[0]))
Paul Wilkins's avatar
Paul Wilkins committed
84
      mi->segment_id =
85
        (unsigned char)(2 + vp9_read(r, xd->mb_segment_tree_probs[2]));
John Koleszar's avatar
John Koleszar committed
86
    else
Paul Wilkins's avatar
Paul Wilkins committed
87
      mi->segment_id =
88
        (unsigned char)(vp9_read(r, xd->mb_segment_tree_probs[1]));
John Koleszar's avatar
John Koleszar committed
89
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
90
}
91

92
#if CONFIG_NEW_MVREF
93 94
int vp9_read_mv_ref_id(vp9_reader *r,
                       vp9_prob * ref_id_probs) {
95 96
  int ref_index = 0;

97
  if (vp9_read(r, ref_id_probs[0])) {
98
    ref_index++;
99
    if (vp9_read(r, ref_id_probs[1])) {
100
      ref_index++;
101
      if (vp9_read(r, ref_id_probs[2]))
102 103 104 105 106 107 108
        ref_index++;
    }
  }
  return ref_index;
}
#endif

109
extern const int vp9_i8x8_block[4];
110
static void kfread_modes(VP9D_COMP *pbi,
John Koleszar's avatar
John Koleszar committed
111 112 113 114
                         MODE_INFO *m,
                         int mb_row,
                         int mb_col,
                         BOOL_DECODER* const bc) {
115
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
116 117 118 119 120 121 122 123
  const int mis = pbi->common.mode_info_stride;
  int map_index = mb_row * pbi->common.mb_cols + mb_col;
  MB_PREDICTION_MODE y_mode;

  // Read the Macroblock segmentation map if it is being updated explicitly
  // this frame (reset to 0 by default).
  m->mbmi.segment_id = 0;
  if (pbi->mb.update_mb_segmentation_map) {
124
    read_mb_segid(bc, &m->mbmi, &pbi->mb);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
#if CONFIG_SUPERBLOCKS
    if (m->mbmi.sb_type) {
      const int nmbs = 1 << m->mbmi.sb_type;
      const int ymbs = MIN(cm->mb_rows - mb_row, nmbs);
      const int xmbs = MIN(cm->mb_cols - mb_col, nmbs);
      int x, y;

      for (y = 0; y < ymbs; y++) {
        for (x = 0; x < xmbs; x++) {
          cm->last_frame_seg_map[map_index + x + y * cm->mb_cols] =
              m->mbmi.segment_id;
        }
      }
    } else
#endif
    {
      cm->last_frame_seg_map[map_index] = m->mbmi.segment_id;
    }
John Koleszar's avatar
John Koleszar committed
143 144 145 146
  }

  m->mbmi.mb_skip_coeff = 0;
  if (pbi->common.mb_no_coeff_skip &&
147 148 149 150
      (!vp9_segfeature_active(&pbi->mb,
                              m->mbmi.segment_id, SEG_LVL_EOB) ||
       (vp9_get_segdata(&pbi->mb,
                        m->mbmi.segment_id, SEG_LVL_EOB) != 0))) {
John Koleszar's avatar
John Koleszar committed
151
    MACROBLOCKD *const xd  = &pbi->mb;
Paul Wilkins's avatar
Paul Wilkins committed
152
    m->mbmi.mb_skip_coeff =
153
      vp9_read(bc, vp9_get_pred_prob(cm, xd, PRED_MBSKIP));
John Koleszar's avatar
John Koleszar committed
154
  } else {
155 156 157 158
    if (vp9_segfeature_active(&pbi->mb,
                              m->mbmi.segment_id, SEG_LVL_EOB) &&
        (vp9_get_segdata(&pbi->mb,
                         m->mbmi.segment_id, SEG_LVL_EOB) == 0)) {
John Koleszar's avatar
John Koleszar committed
159 160 161 162 163
      m->mbmi.mb_skip_coeff = 1;
    } else
      m->mbmi.mb_skip_coeff = 0;
  }

Ronald S. Bultje's avatar
Ronald S. Bultje committed
164
#if CONFIG_SUPERBLOCKS
Ronald S. Bultje's avatar
Ronald S. Bultje committed
165
  if (m->mbmi.sb_type) {
166
    y_mode = (MB_PREDICTION_MODE) read_kf_sb_ymode(bc,
Ronald S. Bultje's avatar
Ronald S. Bultje committed
167 168 169
      pbi->common.sb_kf_ymode_prob[pbi->common.kf_ymode_probs_index]);
  } else
#endif
170
  y_mode = (MB_PREDICTION_MODE) read_kf_mb_ymode(bc,
Ronald S. Bultje's avatar
Ronald S. Bultje committed
171
    pbi->common.kf_ymode_prob[pbi->common.kf_ymode_probs_index]);
172
#if CONFIG_COMP_INTRA_PRED
John Koleszar's avatar
John Koleszar committed
173
  m->mbmi.second_mode = (MB_PREDICTION_MODE)(DC_PRED - 1);
174
#endif
175

John Koleszar's avatar
John Koleszar committed
176
  m->mbmi.ref_frame = INTRA_FRAME;
Paul Wilkins's avatar
Paul Wilkins committed
177

John Koleszar's avatar
John Koleszar committed
178 179
  if ((m->mbmi.mode = y_mode) == B_PRED) {
    int i = 0;
180
#if CONFIG_COMP_INTRA_PRED
181
    int use_comp_pred = vp9_read(bc, DEFAULT_COMP_INTRA_PROB);
182
#endif
John Koleszar's avatar
John Koleszar committed
183 184 185
    do {
      const B_PREDICTION_MODE A = above_block_mode(m, i, mis);
      const B_PREDICTION_MODE L = left_block_mode(m, i);
Paul Wilkins's avatar
Paul Wilkins committed
186

John Koleszar's avatar
John Koleszar committed
187
      m->bmi[i].as_mode.first =
188
        (B_PREDICTION_MODE) read_kf_bmode(
John Koleszar's avatar
John Koleszar committed
189
          bc, pbi->common.kf_bmode_prob [A] [L]);
190
#if CONFIG_COMP_INTRA_PRED
John Koleszar's avatar
John Koleszar committed
191 192
      if (use_comp_pred) {
        m->bmi[i].as_mode.second =
193
          (B_PREDICTION_MODE) read_kf_bmode(
John Koleszar's avatar
John Koleszar committed
194 195 196 197
            bc, pbi->common.kf_bmode_prob [A] [L]);
      } else {
        m->bmi[i].as_mode.second = (B_PREDICTION_MODE)(B_DC_PRED - 1);
      }
198
#endif
John Koleszar's avatar
John Koleszar committed
199 200 201 202 203 204
    } while (++i < 16);
  }
  if ((m->mbmi.mode = y_mode) == I8X8_PRED) {
    int i;
    int mode8x8;
    for (i = 0; i < 4; i++) {
205
      int ib = vp9_i8x8_block[i];
206
      mode8x8 = read_i8x8_mode(bc, pbi->common.fc.i8x8_mode_prob);
John Koleszar's avatar
John Koleszar committed
207 208 209 210
      m->bmi[ib + 0].as_mode.first = mode8x8;
      m->bmi[ib + 1].as_mode.first = mode8x8;
      m->bmi[ib + 4].as_mode.first = mode8x8;
      m->bmi[ib + 5].as_mode.first = mode8x8;
211
#if CONFIG_COMP_INTRA_PRED
John Koleszar's avatar
John Koleszar committed
212 213 214 215
      m->bmi[ib + 0].as_mode.second = (MB_PREDICTION_MODE)(DC_PRED - 1);
      m->bmi[ib + 1].as_mode.second = (MB_PREDICTION_MODE)(DC_PRED - 1);
      m->bmi[ib + 4].as_mode.second = (MB_PREDICTION_MODE)(DC_PRED - 1);
      m->bmi[ib + 5].as_mode.second = (MB_PREDICTION_MODE)(DC_PRED - 1);
216
#endif
John Koleszar's avatar
John Koleszar committed
217 218
    }
  } else
219 220
    m->mbmi.uv_mode = (MB_PREDICTION_MODE)read_uv_mode(bc,
                                                       pbi->common.kf_uv_mode_prob[m->mbmi.mode]);
221
#if CONFIG_COMP_INTRA_PRED
John Koleszar's avatar
John Koleszar committed
222
  m->mbmi.second_uv_mode = (MB_PREDICTION_MODE)(DC_PRED - 1);
223
#endif
224

225
  if (cm->txfm_mode == TX_MODE_SELECT && m->mbmi.mb_skip_coeff == 0 &&
226
      m->mbmi.mode <= I8X8_PRED) {
227
    // FIXME(rbultje) code ternary symbol once all experiments are merged
228
    m->mbmi.txfm_size = vp9_read(bc, cm->prob_tx[0]);
229
    if (m->mbmi.txfm_size != TX_4X4 && m->mbmi.mode != I8X8_PRED) {
230
      m->mbmi.txfm_size += vp9_read(bc, cm->prob_tx[1]);
231
#if CONFIG_TX32X32 && CONFIG_SUPERBLOCKS
Ronald S. Bultje's avatar
Ronald S. Bultje committed
232
      if (m->mbmi.txfm_size != TX_8X8 && m->mbmi.sb_type)
233 234 235 236
        m->mbmi.txfm_size += vp9_read(bc, cm->prob_tx[2]);
#endif
    }
#if CONFIG_TX32X32 && CONFIG_SUPERBLOCKS
Ronald S. Bultje's avatar
Ronald S. Bultje committed
237
  } else if (cm->txfm_mode >= ALLOW_32X32 && m->mbmi.sb_type) {
238 239
    m->mbmi.txfm_size = TX_32X32;
#endif
240
  } else if (cm->txfm_mode >= ALLOW_16X16 && m->mbmi.mode <= TM_PRED) {
241
    m->mbmi.txfm_size = TX_16X16;
242
  } else if (cm->txfm_mode >= ALLOW_8X8 && m->mbmi.mode != B_PRED) {
243 244 245 246
    m->mbmi.txfm_size = TX_8X8;
  } else {
    m->mbmi.txfm_size = TX_4X4;
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
247
}
John Koleszar's avatar
John Koleszar committed
248

249
static int read_nmv_component(vp9_reader *r,
250 251 252
                              int rv,
                              const nmv_component *mvcomp) {
  int v, s, z, c, o, d;
253 254
  s = vp9_read(r, mvcomp->sign);
  c = treed_read(r, vp9_mv_class_tree, mvcomp->classes);
255
  if (c == MV_CLASS_0) {
256
    d = treed_read(r, vp9_mv_class0_tree, mvcomp->class0);
257 258 259 260 261
  } else {
    int i, b;
    d = 0;
    b = c + CLASS0_BITS - 1;  /* number of bits */
    for (i = 0; i < b; ++i)
262
      d |= (vp9_read(r, mvcomp->bits[i]) << i);
263 264 265
  }
  o = d << 3;

266
  z = vp9_get_mv_mag(c, o);
267
  v = (s ? -(z + 8) : (z + 8));
268 269 270
  return v;
}

271
static int read_nmv_component_fp(vp9_reader *r,
272 273 274 275 276 277 278
                                 int v,
                                 int rv,
                                 const nmv_component *mvcomp,
                                 int usehp) {
  int s, z, c, o, d, e, f;
  s = v < 0;
  z = (s ? -v : v) - 1;       /* magnitude - 1 */
279
  z &= ~7;
280

281
  c = vp9_get_mv_class(z, &o);
282 283 284
  d = o >> 3;

  if (c == MV_CLASS_0) {
285
    f = treed_read(r, vp9_mv_fp_tree, mvcomp->class0_fp[d]);
286
  } else {
287
    f = treed_read(r, vp9_mv_fp_tree, mvcomp->fp);
288 289 290 291 292
  }
  o += (f << 1);

  if (usehp) {
    if (c == MV_CLASS_0) {
293
      e = vp9_read(r, mvcomp->class0_hp);
294
    } else {
295
      e = vp9_read(r, mvcomp->hp);
296 297 298 299 300
    }
    o += e;
  } else {
    ++o;  /* Note if hp is not used, the default value of the hp bit is 1 */
  }
301
  z = vp9_get_mv_mag(c, o);
302 303 304 305
  v = (s ? -(z + 1) : (z + 1));
  return v;
}

306
static void read_nmv(vp9_reader *r, MV *mv, const MV *ref,
307
                     const nmv_context *mvctx) {
308
  MV_JOINT_TYPE j = treed_read(r, vp9_mv_joint_tree, mvctx->joints);
309 310 311 312 313 314 315 316 317
  mv->row = mv-> col = 0;
  if (j == MV_JOINT_HZVNZ || j == MV_JOINT_HNZVNZ) {
    mv->row = read_nmv_component(r, ref->row, &mvctx->comps[0]);
  }
  if (j == MV_JOINT_HNZVZ || j == MV_JOINT_HNZVNZ) {
    mv->col = read_nmv_component(r, ref->col, &mvctx->comps[1]);
  }
}

318
static void read_nmv_fp(vp9_reader *r, MV *mv, const MV *ref,
319
                        const nmv_context *mvctx, int usehp) {
320 321
  MV_JOINT_TYPE j = vp9_get_mv_joint(*mv);
  usehp = usehp && vp9_use_nmv_hp(ref);
322 323 324 325 326 327 328 329
  if (j == MV_JOINT_HZVNZ || j == MV_JOINT_HNZVNZ) {
    mv->row = read_nmv_component_fp(r, mv->row, ref->row, &mvctx->comps[0],
                                    usehp);
  }
  if (j == MV_JOINT_HNZVZ || j == MV_JOINT_HNZVNZ) {
    mv->col = read_nmv_component_fp(r, mv->col, ref->col, &mvctx->comps[1],
                                    usehp);
  }
330
  //printf("  %d: %d %d ref: %d %d\n", usehp, mv->row, mv-> col, ref->row, ref->col);
331 332
}

333 334 335
static void update_nmv(vp9_reader *bc, vp9_prob *const p,
                       const vp9_prob upd_p) {
  if (vp9_read(bc, upd_p)) {
336
#ifdef LOW_PRECISION_MV_UPDATE
337
    *p = (vp9_read_literal(bc, 7) << 1) | 1;
338
#else
339
    *p = (vp9_read_literal(bc, 8));
340 341 342 343
#endif
  }
}

344
static void read_nmvprobs(vp9_reader *bc, nmv_context *mvctx,
345 346 347
                          int usehp) {
  int i, j, k;
#ifdef MV_GROUP_UPDATE
348
  if (!vp9_read_bit(bc)) return;
349 350 351
#endif
  for (j = 0; j < MV_JOINTS - 1; ++j) {
    update_nmv(bc, &mvctx->joints[j],
352
               VP9_NMV_UPDATE_PROB);
353 354 355
  }
  for (i = 0; i < 2; ++i) {
    update_nmv(bc, &mvctx->comps[i].sign,
356
               VP9_NMV_UPDATE_PROB);
357 358
    for (j = 0; j < MV_CLASSES - 1; ++j) {
      update_nmv(bc, &mvctx->comps[i].classes[j],
359
                 VP9_NMV_UPDATE_PROB);
360 361 362
    }
    for (j = 0; j < CLASS0_SIZE - 1; ++j) {
      update_nmv(bc, &mvctx->comps[i].class0[j],
363
                 VP9_NMV_UPDATE_PROB);
364 365 366
    }
    for (j = 0; j < MV_OFFSET_BITS; ++j) {
      update_nmv(bc, &mvctx->comps[i].bits[j],
367
                 VP9_NMV_UPDATE_PROB);
368 369 370 371 372 373 374
    }
  }

  for (i = 0; i < 2; ++i) {
    for (j = 0; j < CLASS0_SIZE; ++j) {
      for (k = 0; k < 3; ++k)
        update_nmv(bc, &mvctx->comps[i].class0_fp[j][k],
375
                   VP9_NMV_UPDATE_PROB);
376 377 378
    }
    for (j = 0; j < 3; ++j) {
      update_nmv(bc, &mvctx->comps[i].fp[j],
379
                 VP9_NMV_UPDATE_PROB);
380 381 382 383 384 385
    }
  }

  if (usehp) {
    for (i = 0; i < 2; ++i) {
      update_nmv(bc, &mvctx->comps[i].class0_hp,
386
                 VP9_NMV_UPDATE_PROB);
387
      update_nmv(bc, &mvctx->comps[i].hp,
388
                 VP9_NMV_UPDATE_PROB);
389 390 391 392
    }
  }
}

393
// Read the referncence frame
394
static MV_REFERENCE_FRAME read_ref_frame(VP9D_COMP *pbi,
395
                                         vp9_reader *const bc,
John Koleszar's avatar
John Koleszar committed
396 397 398 399 400
                                         unsigned char segment_id) {
  MV_REFERENCE_FRAME ref_frame;
  int seg_ref_active;
  int seg_ref_count = 0;

401
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
402 403
  MACROBLOCKD *const xd = &pbi->mb;

404 405 406
  seg_ref_active = vp9_segfeature_active(xd,
                                         segment_id,
                                         SEG_LVL_REF_FRAME);
John Koleszar's avatar
John Koleszar committed
407 408 409 410

  // If segment coding enabled does the segment allow for more than one
  // possible reference frame
  if (seg_ref_active) {
411 412 413 414
    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
415 416 417 418 419 420 421
  }

  // Segment reference frame features not available or allows for
  // multiple reference frame options
  if (!seg_ref_active || (seg_ref_count > 1)) {
    // Values used in prediction model coding
    unsigned char prediction_flag;
422
    vp9_prob pred_prob;
John Koleszar's avatar
John Koleszar committed
423 424 425
    MV_REFERENCE_FRAME pred_ref;

    // Get the context probability the prediction flag
Paul Wilkins's avatar
Paul Wilkins committed
426
    pred_prob = vp9_get_pred_prob(cm, xd, PRED_REF);
John Koleszar's avatar
John Koleszar committed
427 428

    // Read the prediction status flag
429
    prediction_flag = (unsigned char)vp9_read(bc, pred_prob);
John Koleszar's avatar
John Koleszar committed
430 431

    // Store the prediction flag.
Paul Wilkins's avatar
Paul Wilkins committed
432
    vp9_set_pred_flag(xd, PRED_REF, prediction_flag);
John Koleszar's avatar
John Koleszar committed
433 434

    // Get the predicted reference frame.
Paul Wilkins's avatar
Paul Wilkins committed
435
    pred_ref = vp9_get_pred_ref(cm, xd);
John Koleszar's avatar
John Koleszar committed
436 437 438 439

    // If correctly predicted then use the predicted value
    if (prediction_flag) {
      ref_frame = pred_ref;
Paul Wilkins's avatar
Paul Wilkins committed
440
    }
John Koleszar's avatar
John Koleszar committed
441 442
    // else decode the explicitly coded value
    else {
443
      vp9_prob mod_refprobs[PREDICTION_PROBS];
John Koleszar's avatar
John Koleszar committed
444 445 446 447 448 449 450
      vpx_memcpy(mod_refprobs,
                 cm->mod_refprobs[pred_ref], 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] *=
451
          vp9_check_segref(xd, segment_id, INTRA_FRAME);
John Koleszar's avatar
John Koleszar committed
452
        mod_refprobs[LAST_FRAME] *=
453
          vp9_check_segref(xd, segment_id, LAST_FRAME);
John Koleszar's avatar
John Koleszar committed
454
        mod_refprobs[GOLDEN_FRAME] *=
455 456
          (vp9_check_segref(xd, segment_id, GOLDEN_FRAME) *
           vp9_check_segref(xd, segment_id, ALTREF_FRAME));
John Koleszar's avatar
John Koleszar committed
457 458 459 460 461 462 463
      }

      // Default to INTRA_FRAME (value 0)
      ref_frame = INTRA_FRAME;

      // Do we need to decode the Intra/Inter branch
      if (mod_refprobs[0])
464
        ref_frame = (MV_REFERENCE_FRAME) vp9_read(bc, mod_refprobs[0]);
John Koleszar's avatar
John Koleszar committed
465 466 467 468 469 470
      else
        ref_frame++;

      if (ref_frame) {
        // Do we need to decode the Last/Gf_Arf branch
        if (mod_refprobs[1])
471
          ref_frame += vp9_read(bc, mod_refprobs[1]);
472
        else
John Koleszar's avatar
John Koleszar committed
473 474 475 476 477
          ref_frame++;

        if (ref_frame > 1) {
          // Do we need to decode the GF/Arf branch
          if (mod_refprobs[2])
478
            ref_frame += vp9_read(bc, mod_refprobs[2]);
John Koleszar's avatar
John Koleszar committed
479 480 481
          else {
            if (seg_ref_active) {
              if ((pred_ref == GOLDEN_FRAME) ||
482
                  !vp9_check_segref(xd, segment_id, GOLDEN_FRAME)) {
John Koleszar's avatar
John Koleszar committed
483 484 485 486 487 488 489
                ref_frame = ALTREF_FRAME;
              } else
                ref_frame = GOLDEN_FRAME;
            } else
              ref_frame = (pred_ref == GOLDEN_FRAME)
                          ? ALTREF_FRAME : GOLDEN_FRAME;
          }
490
        }
John Koleszar's avatar
John Koleszar committed
491
      }
492
    }
John Koleszar's avatar
John Koleszar committed
493 494 495 496 497 498 499
  }

  // Segment reference frame features are enabled
  else {
    // The reference frame for the mb is considered as correclty predicted
    // if it is signaled at the segment level for the purposes of the
    // common prediction model
Paul Wilkins's avatar
Paul Wilkins committed
500 501
    vp9_set_pred_flag(xd, PRED_REF, 1);
    ref_frame = vp9_get_pred_ref(cm, xd);
John Koleszar's avatar
John Koleszar committed
502 503 504
  }

  return (MV_REFERENCE_FRAME)ref_frame;
505
}
John Koleszar's avatar
John Koleszar committed
506

Ronald S. Bultje's avatar
Ronald S. Bultje committed
507
#if CONFIG_SUPERBLOCKS
508 509
static MB_PREDICTION_MODE read_sb_mv_ref(vp9_reader *bc, const vp9_prob *p) {
  return (MB_PREDICTION_MODE) treed_read(bc, vp9_sb_mv_ref_tree, p);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
510 511
}
#endif
John Koleszar's avatar
John Koleszar committed
512

513 514
static MB_PREDICTION_MODE read_mv_ref(vp9_reader *bc, const vp9_prob *p) {
  return (MB_PREDICTION_MODE) treed_read(bc, vp9_mv_ref_tree, p);
John Koleszar's avatar
John Koleszar committed
515 516
}

517 518
static B_PREDICTION_MODE sub_mv_ref(vp9_reader *bc, const vp9_prob *p) {
  return (B_PREDICTION_MODE) treed_read(bc, vp9_sub_mv_ref_tree, p);
John Koleszar's avatar
John Koleszar committed
519
}
Scott LaVarnway's avatar
Scott LaVarnway committed
520 521

#ifdef VPX_MODE_COUNT
522
unsigned int vp9_mv_cont_count[5][4] = {
John Koleszar's avatar
John Koleszar committed
523 524 525 526 527
  { 0, 0, 0, 0 },
  { 0, 0, 0, 0 },
  { 0, 0, 0, 0 },
  { 0, 0, 0, 0 },
  { 0, 0, 0, 0 }
John Koleszar's avatar
John Koleszar committed
528
};
Scott LaVarnway's avatar
Scott LaVarnway committed
529
#endif
John Koleszar's avatar
John Koleszar committed
530

531 532
static const unsigned char mbsplit_fill_count[4] = {8, 8, 4, 1};
static const unsigned char mbsplit_fill_offset[4][16] = {
John Koleszar's avatar
John Koleszar committed
533 534 535 536
  { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10, 11, 12, 13, 14, 15},
  { 0,  1,  4,  5,  8,  9, 12, 13,  2,  3,   6,  7, 10, 11, 14, 15},
  { 0,  1,  4,  5,  2,  3,  6,  7,  8,  9,  12, 13, 10, 11, 14, 15},
  { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10, 11, 12, 13, 14, 15}
Scott LaVarnway's avatar
Scott LaVarnway committed
537
};
John Koleszar's avatar
John Koleszar committed
538

539
static void read_switchable_interp_probs(VP9D_COMP* const pbi,
John Koleszar's avatar
John Koleszar committed
540
                                         BOOL_DECODER* const bc) {
541
  VP9_COMMON *const cm = &pbi->common;
542
  int i, j;
543 544 545
  for (j = 0; j <= VP9_SWITCHABLE_FILTERS; ++j) {
    for (i = 0; i < VP9_SWITCHABLE_FILTERS - 1; ++i) {
      cm->fc.switchable_interp_prob[j][i] = vp9_read_literal(bc, 8);
546 547 548 549 550
    }
  }
  //printf("DECODER: %d %d\n", cm->fc.switchable_interp_prob[0],
  //cm->fc.switchable_interp_prob[1]);
}
John Koleszar's avatar
John Koleszar committed
551

552
static void mb_mode_mv_init(VP9D_COMP *pbi, vp9_reader *bc) {
553
  VP9_COMMON *const cm = &pbi->common;
554
  nmv_context *const nmvc = &pbi->common.fc.nmvc;
John Koleszar's avatar
John Koleszar committed
555
  MACROBLOCKD *const xd  = &pbi->mb;
John Koleszar's avatar
John Koleszar committed
556

557 558
  if (cm->frame_type == KEY_FRAME) {
    if (!cm->kf_ymode_probs_update)
559
      cm->kf_ymode_probs_index = vp9_read_literal(bc, 3);
560
  } else {
561
#if CONFIG_PRED_FILTER
562
    cm->pred_filter_mode = (vp9_prob)vp9_read_literal(bc, 2);
563

John Koleszar's avatar
John Koleszar committed
564
    if (cm->pred_filter_mode == 2)
565
      cm->prob_pred_filter_off = (vp9_prob)vp9_read_literal(bc, 8);
566 567
#endif
    if (cm->mcomp_filter_type == SWITCHABLE)
John Koleszar's avatar
John Koleszar committed
568
      read_switchable_interp_probs(pbi, bc);
569 570 571 572 573 574
#if CONFIG_COMP_INTERINTRA_PRED
    if (cm->use_interintra) {
      if (vp9_read(bc, VP9_UPD_INTERINTRA_PROB))
        cm->fc.interintra_prob  = (vp9_prob)vp9_read_literal(bc, 8);
    }
#endif
John Koleszar's avatar
John Koleszar committed
575
    // Decode the baseline probabilities for decoding reference frame
576 577 578
    cm->prob_intra_coded = (vp9_prob)vp9_read_literal(bc, 8);
    cm->prob_last_coded  = (vp9_prob)vp9_read_literal(bc, 8);
    cm->prob_gf_coded    = (vp9_prob)vp9_read_literal(bc, 8);
John Koleszar's avatar
John Koleszar committed
579 580 581

    // Computes a modified set of probabilities for use when reference
    // frame prediction fails.
Paul Wilkins's avatar
Paul Wilkins committed
582
    vp9_compute_mod_refprobs(cm);
John Koleszar's avatar
John Koleszar committed
583

584
    pbi->common.comp_pred_mode = vp9_read(bc, 128);
John Koleszar's avatar
John Koleszar committed
585
    if (cm->comp_pred_mode)
586
      cm->comp_pred_mode += vp9_read(bc, 128);
John Koleszar's avatar
John Koleszar committed
587 588 589
    if (cm->comp_pred_mode == HYBRID_PREDICTION) {
      int i;
      for (i = 0; i < COMP_PRED_CONTEXTS; i++)
590
        cm->prob_comppred[i] = (vp9_prob)vp9_read_literal(bc, 8);
John Koleszar's avatar
John Koleszar committed
591
    }
John Koleszar's avatar
John Koleszar committed
592

593
    if (vp9_read_bit(bc)) {
John Koleszar's avatar
John Koleszar committed
594
      int i = 0;
John Koleszar's avatar
John Koleszar committed
595

John Koleszar's avatar
John Koleszar committed
596
      do {
597 598
        cm->fc.ymode_prob[i] = (vp9_prob) vp9_read_literal(bc, 8);
      } while (++i < VP9_YMODES - 1);
John Koleszar's avatar
John Koleszar committed
599
    }
600

601 602 603 604 605 606 607 608 609 610
#if CONFIG_SUPERBLOCKS
    if (vp9_read_bit(bc)) {
      int i = 0;

      do {
        cm->fc.sb_ymode_prob[i] = (vp9_prob) vp9_read_literal(bc, 8);
      } while (++i < VP9_I32X32_MODES - 1);
    }
#endif

611
    read_nmvprobs(bc, nmvc, xd->allow_high_precision_mv);
John Koleszar's avatar
John Koleszar committed
612
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
613
}
John Koleszar's avatar
John Koleszar committed
614

615 616 617
// This function either reads the segment id for the current macroblock from
// the bitstream or if the value is temporally predicted asserts the predicted
// value
618
static void read_mb_segment_id(VP9D_COMP *pbi,
John Koleszar's avatar
John Koleszar committed
619 620
                               int mb_row, int mb_col,
                               BOOL_DECODER* const bc) {
621
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
622
  MACROBLOCKD *const xd  = &pbi->mb;
John Koleszar's avatar
John Koleszar committed
623 624 625 626 627 628 629 630 631 632
  MODE_INFO *mi = xd->mode_info_context;
  MB_MODE_INFO *mbmi = &mi->mbmi;
  int index = mb_row * pbi->common.mb_cols + mb_col;

  if (xd->segmentation_enabled) {
    if (xd->update_mb_segmentation_map) {
      // Is temporal coding of the segment id for this mb enabled.
      if (cm->temporal_update) {
        // Get the context based probability for reading the
        // prediction status flag
633
        vp9_prob pred_prob =
Paul Wilkins's avatar
Paul Wilkins committed
634
          vp9_get_pred_prob(cm, xd, PRED_SEG_ID);
635

John Koleszar's avatar
John Koleszar committed
636 637
        // Read the prediction status flag
        unsigned char seg_pred_flag =
638
          (unsigned char)vp9_read(bc, pred_prob);
639

John Koleszar's avatar
John Koleszar committed
640
        // Store the prediction flag.
Paul Wilkins's avatar
Paul Wilkins committed
641
        vp9_set_pred_flag(xd, PRED_SEG_ID, seg_pred_flag);
John Koleszar's avatar
John Koleszar committed
642 643 644 645

        // If the value is flagged as correctly predicted
        // then use the predicted value
        if (seg_pred_flag) {
Ronald S. Bultje's avatar
Ronald S. Bultje committed
646
          mbmi->segment_id = vp9_get_pred_mb_segid(cm, xd, index);
647
        }
John Koleszar's avatar
John Koleszar committed
648 649
        // Else .... decode it explicitly
        else {
650
          read_mb_segid(bc, mbmi, xd);
John Koleszar's avatar
John Koleszar committed
651 652 653 654
        }
      }
      // Normal unpredicted coding mode
      else {
655
        read_mb_segid(bc, mbmi, xd);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
656 657
      }
#if CONFIG_SUPERBLOCKS
Ronald S. Bultje's avatar
Ronald S. Bultje committed
658 659 660 661 662 663 664 665 666 667 668
      if (mbmi->sb_type) {
        const int nmbs = 1 << mbmi->sb_type;
        const int ymbs = MIN(cm->mb_rows - mb_row, nmbs);
        const int xmbs = MIN(cm->mb_cols - mb_col, nmbs);
        int x, y;

        for (y = 0; y < ymbs; y++) {
          for (x = 0; x < xmbs; x++) {
            cm->last_frame_seg_map[index + x + y * cm->mb_cols] =
                mbmi->segment_id;
          }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
669
        }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
670 671 672
      } else
#endif
      {
John Koleszar's avatar
John Koleszar committed
673 674
        cm->last_frame_seg_map[index] = mbmi->segment_id;
      }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
675 676
    } else {
#if CONFIG_SUPERBLOCKS
Ronald S. Bultje's avatar
Ronald S. Bultje committed
677 678 679 680 681 682 683 684 685 686 687 688 689
      if (mbmi->sb_type) {
        const int nmbs = 1 << mbmi->sb_type;
        const int ymbs = MIN(cm->mb_rows - mb_row, nmbs);
        const int xmbs = MIN(cm->mb_cols - mb_col, nmbs);
        unsigned segment_id = -1;
        int x, y;

        for (y = 0; y < ymbs; y++) {
          for (x = 0; x < xmbs; x++) {
            segment_id = MIN(segment_id,
                             cm->last_frame_seg_map[index + x +
                                                    y * cm->mb_cols]);
          }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
690
        }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
691
        mbmi->segment_id = segment_id;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
692 693 694 695 696
      } else
#endif
      {
        mbmi->segment_id = cm->last_frame_seg_map[index];
      }
697
    }
John Koleszar's avatar
John Koleszar committed
698 699 700 701 702
  } else {
    // The encoder explicitly sets the segment_id to 0
    // when segmentation is disabled
    mbmi->segment_id = 0;
  }
703
}
704

705
static void read_mb_modes_mv(VP9D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
706
                             MODE_INFO *prev_mi,
John Koleszar's avatar
John Koleszar committed
707 708
                             int mb_row, int mb_col,
                             BOOL_DECODER* const bc) {
709
  VP9_COMMON *const cm = &pbi->common;
710
  nmv_context *const nmvc = &pbi->common.fc.nmvc;
John Koleszar's avatar
John Koleszar committed
711
  const int mis = pbi->common.mode_info_stride;
John Koleszar's avatar
John Koleszar committed
712
  MACROBLOCKD *const xd  = &pbi->mb;
John Koleszar's avatar
John Koleszar committed
713

714
  int_mv *const mv = &mbmi->mv[0];
John Koleszar's avatar
John Koleszar committed
715 716 717 718
  int mb_to_left_edge;
  int mb_to_right_edge;
  int mb_to_top_edge;
  int mb_to_bottom_edge;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
719 720 721 722 723
#if CONFIG_SUPERBLOCKS
  const int mb_size = 1 << mi->mbmi.sb_type;
#else
  const int mb_size = 1;
#endif
John Koleszar's avatar
John Koleszar committed
724 725 726 727 728 729 730

  mb_to_top_edge = xd->mb_to_top_edge;
  mb_to_bottom_edge = xd->mb_to_bottom_edge;
  mb_to_top_edge -= LEFT_TOP_MARGIN;
  mb_to_bottom_edge += RIGHT_BOTTOM_MARGIN;
  mbmi->need_to_clamp_mvs = 0;
  mbmi->need_to_clamp_secondmv = 0;
731
  mbmi->second_ref_frame = NONE;
John Koleszar's avatar
John Koleszar committed
732 733 734 735
  /* 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 =
Scott LaVarnway's avatar
Scott LaVarnway committed
736
    mb_to_left_edge = -((mb_col * 16) << 3);
John Koleszar's avatar
John Koleszar committed
737
  mb_to_left_edge -= LEFT_TOP_MARGIN;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
738 739
  xd->mb_to_right_edge =
      mb_to_right_edge = ((pbi->common.mb_cols - mb_size - mb_col) * 16) << 3;
John Koleszar's avatar
John Koleszar committed
740 741 742 743 744
  mb_to_right_edge += RIGHT_BOTTOM_MARGIN;

  // Make sure the MACROBLOCKD mode info pointer is pointed at the
  // correct entry for the current macroblock.
  xd->mode_info_context = mi;
745
  xd->prev_mode_info_context = prev_mi;
John Koleszar's avatar
John Koleszar committed
746 747

  // Read the macroblock segment id.
John Koleszar's avatar
John Koleszar committed
748
  read_mb_segment_id(pbi, mb_row, mb_col, bc);
John Koleszar's avatar
John Koleszar committed
749 750

  if (pbi->common.mb_no_coeff_skip &&
751 752 753
      (!vp9_segfeature_active(xd,
                              mbmi->segment_id, SEG_LVL_EOB) ||
       (vp9_get_segdata(xd, mbmi->segment_id, SEG_LVL_EOB) != 0))) {
John Koleszar's avatar
John Koleszar committed
754 755
    // Read the macroblock coeff skip flag if this feature is in use,
    // else default to 0
756
    mbmi->mb_skip_coeff = vp9_read(bc, vp9_get_pred_prob(cm, xd, PRED_MBSKIP));
John Koleszar's avatar
John Koleszar committed
757
  } else {
758 759 760
    if (vp9_segfeature_active(xd,
                              mbmi->segment_id, SEG_LVL_EOB) &&
        (vp9_get_segdata(xd, mbmi->segment_id, SEG_LVL_EOB) == 0)) {
John Koleszar's avatar
John Koleszar committed
761 762 763 764 765 766
      mbmi->mb_skip_coeff = 1;
    } else
      mbmi->mb_skip_coeff = 0;
  }

  // Read the reference frame
767 768 769 770 771
  if (vp9_segfeature_active(xd, mbmi->segment_id, SEG_LVL_MODE)
      && vp9_get_segdata(xd, mbmi->segment_id, SEG_LVL_MODE) < NEARESTMV)
    mbmi->ref_frame = INTRA_FRAME;
  else
    mbmi->ref_frame = read_ref_frame(pbi, bc, mbmi->segment_id);
John Koleszar's avatar
John Koleszar committed
772 773 774 775 776

  // If reference frame is an Inter frame
  if (mbmi->ref_frame) {
    int_mv nearest, nearby, best_mv;
    int_mv nearest_second, nearby_second, best_mv_second;
777
    vp9_prob mv_ref_p [VP9_MVREFS - 1];
John Koleszar's avatar
John Koleszar committed
778

779 780
    int recon_y_stride, recon_yoffset;
    int recon_uv_stride, recon_uvoffset;
781
    MV_REFERENCE_FRAME ref_frame = mbmi->ref_frame;
782 783 784 785 786

    {
      int ref_fb_idx;

      /* Select the appropriate reference frame for this MB */
Paul Wilkins's avatar
Paul Wilkins committed
787
      if (ref_frame == LAST_FRAME)
788
        ref_fb_idx = cm->lst_fb_idx;
Paul Wilkins's avatar
Paul Wilkins committed
789
      else if (ref_frame == GOLDEN_FRAME)
790 791 792 793 794 795 796 797 798 799 800 801 802 803
        ref_fb_idx = cm->gld_fb_idx;
      else
        ref_fb_idx = cm->alt_fb_idx;

      recon_y_stride = cm->yv12_fb[ref_fb_idx].y_stride  ;
      recon_uv_stride = cm->yv12_fb[ref_fb_idx].uv_stride;

      recon_yoffset = (mb_row * recon_y_stride * 16) + (mb_col * 16);
      recon_uvoffset = (mb_row * recon_uv_stride * 8) + (mb_col * 8);

      xd->pre.y_buffer = cm->yv12_fb[ref_fb_idx].y_buffer + recon_yoffset;
      xd->pre.u_buffer = cm->yv12_fb[ref_fb_idx].u_buffer + recon_uvoffset;
      xd->pre.v_buffer = cm->yv12_fb[ref_fb_idx].v_buffer + recon_uvoffset;

804 805 806 807 808
#ifdef DEC_DEBUG
      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);
#endif
Paul Wilkins's avatar
Paul Wilkins committed
809 810 811
      vp9_find_mv_refs(xd, mi, prev_mi,
                       ref_frame, mbmi->ref_mvs[ref_frame],
                       cm->ref_frame_sign_bias);
Paul Wilkins's avatar
Paul Wilkins committed
812

Paul Wilkins's avatar
Paul Wilkins committed
813 814
      vp9_mv_ref_probs(&pbi->common, mv_ref_p,
                       mbmi->mb_mode_context[ref_frame]);
815

816 817 818 819 820 821
      // Is the segment level mode feature enabled for this segment
      if (vp9_segfeature_active(xd, mbmi->segment_id, SEG_LVL_MODE)) {
        mbmi->mode =
          vp9_get_segdata(xd, mbmi->segment_id, SEG_LVL_MODE);
      } else {
#if CONFIG_SUPERBLOCKS
Ronald S. Bultje's avatar
Ronald S. Bultje committed
822
        if (mbmi->sb_type)
823 824 825 826