vp9_decodemv.c 37.2 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/common/vp9_reconinter.h"
16
#include "vp9/decoder/vp9_onyxd_int.h"
17
#include "vp9/common/vp9_findnearmv.h"
Ronald S. Bultje's avatar
Ronald S. Bultje committed
18
#include "vp9/common/vp9_common.h"
19 20 21 22 23
#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
24 25 26
#if CONFIG_DEBUG
#include <assert.h>
#endif
27

John Koleszar's avatar
John Koleszar committed
28
// #define DEBUG_DEC_MV
29 30 31
#ifdef DEBUG_DEC_MV
int dec_mvcount = 0;
#endif
Dmitry Kovalev's avatar
Dmitry Kovalev committed
32

33 34 35 36
// #define DEC_DEBUG
#ifdef DEC_DEBUG
extern int dec_debug;
#endif
37

38 39
static B_PREDICTION_MODE read_bmode(vp9_reader *r, const vp9_prob *p) {
  B_PREDICTION_MODE m = treed_read(r, vp9_bmode_tree, p);
40 41 42 43 44 45 46 47
#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;
}

48 49
static B_PREDICTION_MODE read_kf_bmode(vp9_reader *r, const vp9_prob *p) {
  return (B_PREDICTION_MODE)treed_read(r, vp9_kf_bmode_tree, p);
Scott LaVarnway's avatar
Scott LaVarnway committed
50 51
}

52 53
static MB_PREDICTION_MODE read_ymode(vp9_reader *r, const vp9_prob *p) {
  return (MB_PREDICTION_MODE)treed_read(r, vp9_ymode_tree, p);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
54
}
Scott LaVarnway's avatar
Scott LaVarnway committed
55

56 57
static MB_PREDICTION_MODE read_sb_ymode(vp9_reader *r, const vp9_prob *p) {
  return (MB_PREDICTION_MODE)treed_read(r, vp9_sb_ymode_tree, p);
58 59
}

60 61
static MB_PREDICTION_MODE read_kf_sb_ymode(vp9_reader *r, const vp9_prob *p) {
  return (MB_PREDICTION_MODE)treed_read(r, vp9_uv_mode_tree, p);
Scott LaVarnway's avatar
Scott LaVarnway committed
62 63
}

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

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

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

76 77 78 79
static int read_mb_segid(vp9_reader *r, MACROBLOCKD *xd) {
  const vp9_prob *const p = xd->mb_segment_tree_probs;
  return vp9_read(r, p[0]) ? 2 + vp9_read(r, p[2])
                           :     vp9_read(r, p[1]);
Scott LaVarnway's avatar
Scott LaVarnway committed
80
}
81

82 83 84 85
static void set_segment_id(VP9_COMMON *cm, MB_MODE_INFO *mbmi,
                           int mb_row, int mb_col, int segment_id) {
  const int mb_index = mb_row * cm->mb_cols + mb_col;
  const BLOCK_SIZE_TYPE sb_type = mbmi->sb_type;
86
  if (sb_type > BLOCK_SIZE_MB16X16) {
87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
    const int bw = 1 << mb_width_log2(sb_type);
    const int bh = 1 << mb_height_log2(sb_type);
    const int ymbs = MIN(cm->mb_rows - mb_row, bh);
    const int xmbs = MIN(cm->mb_cols - mb_col, bw);
    int x, y;

    for (y = 0; y < ymbs; y++) {
      for (x = 0; x < xmbs; x++) {
        const int index = mb_index + (y * cm->mb_cols + x);
        cm->last_frame_seg_map[index] = segment_id;
      }
    }
  } else {
    cm->last_frame_seg_map[mb_index] = segment_id;
  }
}

104 105 106 107 108 109 110 111 112 113 114
static TX_SIZE select_txfm_size(VP9_COMMON *cm, vp9_reader *r,
                                int allow_16x16, int allow_32x32) {
  TX_SIZE txfm_size = vp9_read(r, cm->prob_tx[0]);  // TX_4X4 or >TX_4X4
  if (txfm_size != TX_4X4 && allow_16x16) {
    txfm_size += vp9_read(r, cm->prob_tx[1]);       // TX_8X8 or >TX_8X8
    if (txfm_size != TX_8X8 && allow_32x32)
      txfm_size += vp9_read(r, cm->prob_tx[2]);     // TX_16X16 or >TX_16X16
  }
  return txfm_size;
}

115
extern const int vp9_i8x8_block[4];
116 117 118
static void kfread_modes(VP9D_COMP *pbi, MODE_INFO *m,
                         int mb_row, int mb_col,
                         vp9_reader *r) {
119
  VP9_COMMON *const cm = &pbi->common;
120 121
  MACROBLOCKD *const xd = &pbi->mb;
  const int mis = cm->mode_info_stride;
122 123
  m->mbmi.ref_frame = INTRA_FRAME;

124
  // Read segmentation map if it is being updated explicitly this frame
John Koleszar's avatar
John Koleszar committed
125
  m->mbmi.segment_id = 0;
126 127 128
  if (xd->segmentation_enabled && xd->update_mb_segmentation_map) {
    m->mbmi.segment_id = read_mb_segid(r, xd);
    set_segment_id(cm, &m->mbmi, mb_row, mb_col, m->mbmi.segment_id);
John Koleszar's avatar
John Koleszar committed
129 130
  }

131
  m->mbmi.mb_skip_coeff = vp9_segfeature_active(xd, m->mbmi.segment_id,
132 133
                                                SEG_LVL_SKIP);
  if (!m->mbmi.mb_skip_coeff)
134
    m->mbmi.mb_skip_coeff = vp9_read(r, vp9_get_pred_prob(cm, xd, PRED_MBSKIP));
John Koleszar's avatar
John Koleszar committed
135

136
  // luma mode
137
  m->mbmi.mode = m->mbmi.sb_type > BLOCK_SIZE_MB16X16 ?
138 139
      read_kf_sb_ymode(r, cm->sb_kf_ymode_prob[cm->kf_ymode_probs_index]):
      read_kf_mb_ymode(r, cm->kf_ymode_prob[cm->kf_ymode_probs_index]);
140

John Koleszar's avatar
John Koleszar committed
141
  m->mbmi.ref_frame = INTRA_FRAME;
Paul Wilkins's avatar
Paul Wilkins committed
142

143
  if (m->mbmi.mode == I4X4_PRED) {
144 145
    int i;
    for (i = 0; i < 16; ++i) {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
146
      const B_PREDICTION_MODE a = above_block_mode(m, i, mis);
147
      const B_PREDICTION_MODE l = xd->left_available || (i & 3) ?
148
                                  left_block_mode(m, i) : B_DC_PRED;
Paul Wilkins's avatar
Paul Wilkins committed
149

150
      m->bmi[i].as_mode.first = read_kf_bmode(r, cm->kf_bmode_prob[a][l]);
151
    }
John Koleszar's avatar
John Koleszar committed
152
  }
Dmitry Kovalev's avatar
Dmitry Kovalev committed
153

154
  if (m->mbmi.mode == I8X8_PRED) {
John Koleszar's avatar
John Koleszar committed
155
    int i;
156
    for (i = 0; i < 4; ++i) {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
157
      const int ib = vp9_i8x8_block[i];
158
      const int mode8x8 = read_i8x8_mode(r, cm->fc.i8x8_mode_prob);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
159

John Koleszar's avatar
John Koleszar committed
160 161 162 163 164
      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;
    }
165 166 167 168
  }

  // chroma mode
  if (m->mbmi.mode != I8X8_PRED) {
169
    m->mbmi.uv_mode = read_uv_mode(r, cm->kf_uv_mode_prob[m->mbmi.mode]);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
170
  }
171

Dmitry Kovalev's avatar
Dmitry Kovalev committed
172
  if (cm->txfm_mode == TX_MODE_SELECT &&
173
      !m->mbmi.mb_skip_coeff &&
174
      m->mbmi.mode <= I8X8_PRED) {
175 176 177
    const int allow_16x16 = m->mbmi.mode != I8X8_PRED;
    const int allow_32x32 = m->mbmi.sb_type >= BLOCK_SIZE_SB32X32;
    m->mbmi.txfm_size = select_txfm_size(cm, r, allow_16x16, allow_32x32);
178 179
  } else if (cm->txfm_mode >= ALLOW_32X32 &&
             m->mbmi.sb_type >= BLOCK_SIZE_SB32X32) {
180
    m->mbmi.txfm_size = TX_32X32;
181
  } else if (cm->txfm_mode >= ALLOW_16X16 && m->mbmi.mode <= TM_PRED) {
182
    m->mbmi.txfm_size = TX_16X16;
Yaowu Xu's avatar
Yaowu Xu committed
183
  } else if (cm->txfm_mode >= ALLOW_8X8 && m->mbmi.mode != I4X4_PRED) {
184 185 186 187
    m->mbmi.txfm_size = TX_8X8;
  } else {
    m->mbmi.txfm_size = TX_4X4;
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
188
}
John Koleszar's avatar
John Koleszar committed
189

190

191
static int read_nmv_component(vp9_reader *r,
192 193
                              int rv,
                              const nmv_component *mvcomp) {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
194 195 196 197 198
  int mag, d;
  const int sign = vp9_read(r, mvcomp->sign);
  const int mv_class = treed_read(r, vp9_mv_class_tree, mvcomp->classes);

  if (mv_class == MV_CLASS_0) {
199
    d = treed_read(r, vp9_mv_class0_tree, mvcomp->class0);
200
  } else {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
201 202 203
    int i;
    int n = mv_class + CLASS0_BITS - 1;  // number of bits

204
    d = 0;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
205 206
    for (i = 0; i < n; ++i)
      d |= vp9_read(r, mvcomp->bits[i]) << i;
207 208
  }

Dmitry Kovalev's avatar
Dmitry Kovalev committed
209 210
  mag = vp9_get_mv_mag(mv_class, d << 3);
  return sign ? -(mag + 8) : (mag + 8);
211 212
}

213
static int read_nmv_component_fp(vp9_reader *r,
214 215 216 217
                                 int v,
                                 int rv,
                                 const nmv_component *mvcomp,
                                 int usehp) {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
218 219 220 221 222 223 224
  const int sign = v < 0;
  int mag = ((sign ? -v : v) - 1) & ~7;  // magnitude - 1
  int offset;
  const int mv_class = vp9_get_mv_class(mag, &offset);
  const int f = mv_class == MV_CLASS_0 ?
      treed_read(r, vp9_mv_fp_tree, mvcomp->class0_fp[offset >> 3]):
      treed_read(r, vp9_mv_fp_tree, mvcomp->fp);
225

Dmitry Kovalev's avatar
Dmitry Kovalev committed
226
  offset += f << 1;
227 228

  if (usehp) {
229 230
    const vp9_prob p = mv_class == MV_CLASS_0 ? mvcomp->class0_hp : mvcomp->hp;
    offset += vp9_read(r, p);
231
  } else {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
232
    offset += 1;  // If hp is not used, the default value of the hp bit is 1
233
  }
Dmitry Kovalev's avatar
Dmitry Kovalev committed
234 235
  mag = vp9_get_mv_mag(mv_class, offset);
  return sign ? -(mag + 1) : (mag + 1);
236 237
}

238
static void read_nmv(vp9_reader *r, MV *mv, const MV *ref,
239
                     const nmv_context *mvctx) {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
240
  const MV_JOINT_TYPE j = treed_read(r, vp9_mv_joint_tree, mvctx->joints);
241 242
  mv->row = mv->col = 0;

243
  if (mv_joint_vertical(j))
244
    mv->row = read_nmv_component(r, ref->row, &mvctx->comps[0]);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
245

246
  if (mv_joint_horizontal(j))
247 248 249
    mv->col = read_nmv_component(r, ref->col, &mvctx->comps[1]);
}

250
static void read_nmv_fp(vp9_reader *r, MV *mv, const MV *ref,
251
                        const nmv_context *mvctx, int usehp) {
252
  const MV_JOINT_TYPE j = vp9_get_mv_joint(mv);
253
  usehp = usehp && vp9_use_nmv_hp(ref);
254
  if (mv_joint_vertical(j))
255 256
    mv->row = read_nmv_component_fp(r, mv->row, ref->row, &mvctx->comps[0],
                                    usehp);
257

258
  if (mv_joint_horizontal(j))
259 260 261 262
    mv->col = read_nmv_component_fp(r, mv->col, ref->col, &mvctx->comps[1],
                                    usehp);
}

263
static void update_nmv(vp9_reader *r, vp9_prob *const p,
264
                       const 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
  }
}

274
static void read_nmvprobs(vp9_reader *r, nmv_context *mvctx,
275 276
                          int usehp) {
  int i, j, k;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
277

278
#ifdef MV_GROUP_UPDATE
279
  if (!vp9_read_bit(r))
Dmitry Kovalev's avatar
Dmitry Kovalev committed
280
    return;
281
#endif
Dmitry Kovalev's avatar
Dmitry Kovalev committed
282
  for (j = 0; j < MV_JOINTS - 1; ++j)
283
    update_nmv(r, &mvctx->joints[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
284

285
  for (i = 0; i < 2; ++i) {
286
    update_nmv(r, &mvctx->comps[i].sign, VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
287
    for (j = 0; j < MV_CLASSES - 1; ++j)
288
      update_nmv(r, &mvctx->comps[i].classes[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
289 290

    for (j = 0; j < CLASS0_SIZE - 1; ++j)
291
      update_nmv(r, &mvctx->comps[i].class0[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
292 293

    for (j = 0; j < MV_OFFSET_BITS; ++j)
294
      update_nmv(r, &mvctx->comps[i].bits[j], VP9_NMV_UPDATE_PROB);
295 296 297
  }

  for (i = 0; i < 2; ++i) {
298
    for (j = 0; j < CLASS0_SIZE; ++j)
299
      for (k = 0; k < 3; ++k)
300
        update_nmv(r, &mvctx->comps[i].class0_fp[j][k], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
301 302

    for (j = 0; j < 3; ++j)
303
      update_nmv(r, &mvctx->comps[i].fp[j], VP9_NMV_UPDATE_PROB);
304 305 306 307
  }

  if (usehp) {
    for (i = 0; i < 2; ++i) {
308 309
      update_nmv(r, &mvctx->comps[i].class0_hp, VP9_NMV_UPDATE_PROB);
      update_nmv(r, &mvctx->comps[i].hp, VP9_NMV_UPDATE_PROB);
310 311 312 313
    }
  }
}

314
// Read the referncence frame
315
static MV_REFERENCE_FRAME read_ref_frame(VP9D_COMP *pbi,
316
                                         vp9_reader *r,
317
                                         int segment_id) {
John Koleszar's avatar
John Koleszar committed
318
  MV_REFERENCE_FRAME ref_frame;
319
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
320 321
  MACROBLOCKD *const xd = &pbi->mb;

Dmitry Kovalev's avatar
Dmitry Kovalev committed
322
  int seg_ref_count = 0;
323 324 325 326 327 328 329
  const int seg_ref_active = vp9_segfeature_active(xd, segment_id,
                                                   SEG_LVL_REF_FRAME);

  const int intra = vp9_check_segref(xd, segment_id, INTRA_FRAME);
  const int last = vp9_check_segref(xd, segment_id, LAST_FRAME);
  const int golden = vp9_check_segref(xd, segment_id, GOLDEN_FRAME);
  const int altref = vp9_check_segref(xd, segment_id, ALTREF_FRAME);
John Koleszar's avatar
John Koleszar committed
330 331 332

  // If segment coding enabled does the segment allow for more than one
  // possible reference frame
333 334
  if (seg_ref_active)
    seg_ref_count = intra + last + golden + altref;
John Koleszar's avatar
John Koleszar committed
335 336 337

  // Segment reference frame features not available or allows for
  // multiple reference frame options
338
  if (!seg_ref_active || seg_ref_count > 1) {
John Koleszar's avatar
John Koleszar committed
339 340 341 342
    // Values used in prediction model coding
    MV_REFERENCE_FRAME pred_ref;

    // Get the context probability the prediction flag
Dmitry Kovalev's avatar
Dmitry Kovalev committed
343
    vp9_prob pred_prob = vp9_get_pred_prob(cm, xd, PRED_REF);
John Koleszar's avatar
John Koleszar committed
344 345

    // Read the prediction status flag
346
    unsigned char prediction_flag = vp9_read(r, pred_prob);
John Koleszar's avatar
John Koleszar committed
347 348

    // Store the prediction flag.
Paul Wilkins's avatar
Paul Wilkins committed
349
    vp9_set_pred_flag(xd, PRED_REF, prediction_flag);
John Koleszar's avatar
John Koleszar committed
350 351

    // Get the predicted reference frame.
Paul Wilkins's avatar
Paul Wilkins committed
352
    pred_ref = vp9_get_pred_ref(cm, xd);
John Koleszar's avatar
John Koleszar committed
353 354 355 356

    // If correctly predicted then use the predicted value
    if (prediction_flag) {
      ref_frame = pred_ref;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
357 358
    } else {
      // decode the explicitly coded value
359
      vp9_prob mod_refprobs[PREDICTION_PROBS];
360 361
      vpx_memcpy(mod_refprobs, cm->mod_refprobs[pred_ref],
                 sizeof(mod_refprobs));
John Koleszar's avatar
John Koleszar committed
362 363 364 365

      // If segment coding enabled blank out options that cant occur by
      // setting the branch probability to 0.
      if (seg_ref_active) {
366 367 368
        mod_refprobs[INTRA_FRAME] *= intra;
        mod_refprobs[LAST_FRAME] *= last;
        mod_refprobs[GOLDEN_FRAME] *= golden * altref;
John Koleszar's avatar
John Koleszar committed
369 370 371 372 373 374 375
      }

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

      // Do we need to decode the Intra/Inter branch
      if (mod_refprobs[0])
376
        ref_frame = vp9_read(r, mod_refprobs[0]);
John Koleszar's avatar
John Koleszar committed
377 378 379 380 381 382
      else
        ref_frame++;

      if (ref_frame) {
        // Do we need to decode the Last/Gf_Arf branch
        if (mod_refprobs[1])
383
          ref_frame += vp9_read(r, mod_refprobs[1]);
384
        else
John Koleszar's avatar
John Koleszar committed
385 386 387 388
          ref_frame++;

        if (ref_frame > 1) {
          // Do we need to decode the GF/Arf branch
389
          if (mod_refprobs[2]) {
390
            ref_frame += vp9_read(r, mod_refprobs[2]);
391
          } else {
392 393 394 395 396 397
            if (seg_ref_active)
              ref_frame = pred_ref == GOLDEN_FRAME || !golden ? ALTREF_FRAME
                                                              : GOLDEN_FRAME;
            else
              ref_frame = pred_ref == GOLDEN_FRAME ? ALTREF_FRAME
                                                   : GOLDEN_FRAME;
John Koleszar's avatar
John Koleszar committed
398
          }
399
        }
John Koleszar's avatar
John Koleszar committed
400
      }
401
    }
Dmitry Kovalev's avatar
Dmitry Kovalev committed
402 403
  } else {
    // Segment reference frame features are enabled
John Koleszar's avatar
John Koleszar committed
404 405 406
    // 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
407 408
    vp9_set_pred_flag(xd, PRED_REF, 1);
    ref_frame = vp9_get_pred_ref(cm, xd);
John Koleszar's avatar
John Koleszar committed
409 410
  }

411
  return ref_frame;
412
}
John Koleszar's avatar
John Koleszar committed
413

414 415
static MB_PREDICTION_MODE read_sb_mv_ref(vp9_reader *r, const vp9_prob *p) {
  return (MB_PREDICTION_MODE) treed_read(r, vp9_sb_mv_ref_tree, p);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
416
}
John Koleszar's avatar
John Koleszar committed
417

418 419
static MB_PREDICTION_MODE read_mv_ref(vp9_reader *r, const vp9_prob *p) {
  return (MB_PREDICTION_MODE) treed_read(r, vp9_mv_ref_tree, p);
John Koleszar's avatar
John Koleszar committed
420 421
}

422
static B_PREDICTION_MODE read_sub_mv_ref(vp9_reader *r, const vp9_prob *p) {
423
  return (B_PREDICTION_MODE) treed_read(r, vp9_sub_mv_ref_tree, p);
John Koleszar's avatar
John Koleszar committed
424
}
Scott LaVarnway's avatar
Scott LaVarnway committed
425 426

#ifdef VPX_MODE_COUNT
427
unsigned int vp9_mv_cont_count[5][4] = {
John Koleszar's avatar
John Koleszar committed
428 429 430 431 432
  { 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
433
};
Scott LaVarnway's avatar
Scott LaVarnway committed
434
#endif
John Koleszar's avatar
John Koleszar committed
435

Dmitry Kovalev's avatar
Dmitry Kovalev committed
436
static const unsigned char mbsplit_fill_count[4] = { 8, 8, 4, 1 };
437
static const unsigned char mbsplit_fill_offset[4][16] = {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
438 439 440 441
  { 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
442
};
John Koleszar's avatar
John Koleszar committed
443

444
static void read_switchable_interp_probs(VP9D_COMP* const pbi, vp9_reader *r) {
445
  VP9_COMMON *const cm = &pbi->common;
446
  int i, j;
447 448 449
  for (j = 0; j < VP9_SWITCHABLE_FILTERS + 1; ++j)
    for (i = 0; i < VP9_SWITCHABLE_FILTERS - 1; ++i)
      cm->fc.switchable_interp_prob[j][i] = vp9_read_prob(r);
450
}
John Koleszar's avatar
John Koleszar committed
451

452 453 454 455 456 457 458 459
static INLINE COMPPREDMODE_TYPE read_comp_pred_mode(vp9_reader *r) {
  COMPPREDMODE_TYPE mode = vp9_read_bit(r);
  if (mode)
     mode += vp9_read_bit(r);
  return mode;
}

static void mb_mode_mv_init(VP9D_COMP *pbi, vp9_reader *r) {
460
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
461

462 463
  if (cm->frame_type == KEY_FRAME) {
    if (!cm->kf_ymode_probs_update)
464
      cm->kf_ymode_probs_index = vp9_read_literal(r, 3);
465
  } else {
466 467 468
    nmv_context *const nmvc = &pbi->common.fc.nmvc;
    MACROBLOCKD *const xd = &pbi->mb;
    int i, j;
469

470
    if (cm->mcomp_filter_type == SWITCHABLE)
471
      read_switchable_interp_probs(pbi, r);
472 473
#if CONFIG_COMP_INTERINTRA_PRED
    if (cm->use_interintra) {
474 475
      if (vp9_read(r, VP9_UPD_INTERINTRA_PROB))
        cm->fc.interintra_prob = vp9_read_prob(r);
476 477
    }
#endif
478 479 480 481
    // Baseline probabilities for decoding reference frame
    cm->prob_intra_coded = vp9_read_prob(r);
    cm->prob_last_coded  = vp9_read_prob(r);
    cm->prob_gf_coded    = vp9_read_prob(r);
John Koleszar's avatar
John Koleszar committed
482 483 484

    // Computes a modified set of probabilities for use when reference
    // frame prediction fails.
Paul Wilkins's avatar
Paul Wilkins committed
485
    vp9_compute_mod_refprobs(cm);
John Koleszar's avatar
John Koleszar committed
486

487 488
    cm->comp_pred_mode = read_comp_pred_mode(r);
    if (cm->comp_pred_mode == HYBRID_PREDICTION)
John Koleszar's avatar
John Koleszar committed
489
      for (i = 0; i < COMP_PRED_CONTEXTS; i++)
490
        cm->prob_comppred[i] = vp9_read_prob(r);
John Koleszar's avatar
John Koleszar committed
491

492 493
    // VP9_YMODES
    if (vp9_read_bit(r))
494
      for (i = 0; i < VP9_YMODES - 1; ++i)
495
        cm->fc.ymode_prob[i] = vp9_read_prob(r);
496

497 498
    // VP9_I32X32_MODES
    if (vp9_read_bit(r))
499
      for (i = 0; i < VP9_I32X32_MODES - 1; ++i)
500
        cm->fc.sb_ymode_prob[i] = vp9_read_prob(r);
501

502 503
    for (j = 0; j < PARTITION_PLANES; j++)
      if (vp9_read_bit(r))
504 505 506 507
        for (i = 0; i < PARTITION_TYPES - 1; i++)
          cm->fc.partition_prob[j][i] = vp9_read_prob(r);

    read_nmvprobs(r, nmvc, xd->allow_high_precision_mv);
John Koleszar's avatar
John Koleszar committed
508
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
509
}
John Koleszar's avatar
John Koleszar committed
510

511 512 513
// 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
514 515
static int read_mb_segment_id(VP9D_COMP *pbi, int mb_row, int mb_col,
                              vp9_reader *r) {
516
  VP9_COMMON *const cm = &pbi->common;
517
  MACROBLOCKD *const xd = &pbi->mb;
518 519
  MODE_INFO *const mi = xd->mode_info_context;
  MB_MODE_INFO *const mbmi = &mi->mbmi;
John Koleszar's avatar
John Koleszar committed
520

521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
  if (!xd->segmentation_enabled)
    return 0;  // Default for disabled segmentation

  if (xd->update_mb_segmentation_map) {
    int segment_id;

    if (cm->temporal_update) {
      // Temporal coding of the segment id for this mb is enabled.
      // Get the context based probability for reading the
      // prediction status flag
      const vp9_prob pred_prob = vp9_get_pred_prob(cm, xd, PRED_SEG_ID);
      const int pred_flag = vp9_read(r, pred_prob);
      vp9_set_pred_flag(xd, PRED_SEG_ID, pred_flag);

      // If the value is flagged as correctly predicted
      // then use the predicted value, otherwise decode it explicitly
      segment_id = pred_flag ? vp9_get_pred_mb_segid(cm, mbmi->sb_type,
                                                     mb_row, mb_col)
Paul Wilkins's avatar
Paul Wilkins committed
539
                             : read_mb_segid(r, xd);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
540
    } else {
541
      segment_id = read_mb_segid(r, xd);  // Normal unpredicted coding mode
542
    }
543 544 545

    set_segment_id(cm, mbmi, mb_row, mb_col, segment_id);  // Side effect
    return segment_id;
John Koleszar's avatar
John Koleszar committed
546
  } else {
547
    return vp9_get_pred_mb_segid(cm, mbmi->sb_type, mb_row, mb_col);
John Koleszar's avatar
John Koleszar committed
548
  }
549
}
550

Dmitry Kovalev's avatar
Dmitry Kovalev committed
551 552 553 554 555 556 557 558 559 560 561

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);
}

562 563 564
static INLINE void process_mv(vp9_reader *r, MV *mv, const MV *ref,
                              const nmv_context *nmvc,
                              nmv_context_counts *mvctx,
Dmitry Kovalev's avatar
Dmitry Kovalev committed
565
                              int usehp) {
566 567
  read_nmv(r, mv, ref, nmvc);
  read_nmv_fp(r, mv, ref, nmvc, usehp);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
568 569 570 571 572
  vp9_increment_nmv(mv, ref, mvctx, usehp);
  mv->row += ref->row;
  mv->col += ref->col;
}

573
static INLINE INTERPOLATIONFILTERTYPE read_switchable_filter_type(
574 575
    VP9D_COMP *pbi, vp9_reader *r) {
  const int index = treed_read(r, vp9_switchable_interp_tree,
576 577 578 579 580
                               vp9_get_pred_probs(&pbi->common, &pbi->mb,
                                                  PRED_SWITCHABLE_INTERP));
  return vp9_switchable_interp[index];
}

581
static void read_mb_modes_mv(VP9D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
582
                             MODE_INFO *prev_mi,
John Koleszar's avatar
John Koleszar committed
583
                             int mb_row, int mb_col,
584
                             vp9_reader *r) {
585
  VP9_COMMON *const cm = &pbi->common;
586 587
  nmv_context *const nmvc = &cm->fc.nmvc;
  const int mis = cm->mode_info_stride;
588
  MACROBLOCKD *const xd = &pbi->mb;
John Koleszar's avatar
John Koleszar committed
589

590 591
  int_mv *const mv0 = &mbmi->mv[0];
  int_mv *const mv1 = &mbmi->mv[1];
592 593
  const int bw = 1 << mb_width_log2(mi->mbmi.sb_type);
  const int bh = 1 << mb_height_log2(mi->mbmi.sb_type);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
594

595 596
  const int use_prev_in_find_mv_refs = cm->width == cm->last_width &&
                                       cm->height == cm->last_height &&
597 598
                                       !cm->error_resilient_mode &&
                                       cm->last_show_frame;
John Koleszar's avatar
John Koleszar committed
599

600
  int mb_to_left_edge, mb_to_right_edge, mb_to_top_edge, mb_to_bottom_edge;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
601

John Koleszar's avatar
John Koleszar committed
602 603
  mbmi->need_to_clamp_mvs = 0;
  mbmi->need_to_clamp_secondmv = 0;
604
  mbmi->second_ref_frame = NONE;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
605

606 607 608 609 610
  // Make sure the MACROBLOCKD mode info pointer is pointed at the
  // correct entry for the current macroblock.
  xd->mode_info_context = mi;
  xd->prev_mode_info_context = prev_mi;

Dmitry Kovalev's avatar
Dmitry Kovalev committed
611 612 613
  // 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
614 615
  set_mb_row(cm, xd, mb_row, bh);
  set_mb_col(cm, xd, mb_col, bw);
616

617 618
  mb_to_top_edge = xd->mb_to_top_edge - LEFT_TOP_MARGIN;
  mb_to_bottom_edge = xd->mb_to_bottom_edge + RIGHT_BOTTOM_MARGIN;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
619 620
  mb_to_left_edge = xd->mb_to_left_edge - LEFT_TOP_MARGIN;
  mb_to_right_edge = xd->mb_to_right_edge + RIGHT_BOTTOM_MARGIN;
John Koleszar's avatar
John Koleszar committed
621 622

  // Read the macroblock segment id.
623
  mbmi->segment_id = read_mb_segment_id(pbi, mb_row, mb_col, r);
John Koleszar's avatar
John Koleszar committed
624

625 626 627
  mbmi->mb_skip_coeff = vp9_segfeature_active(xd, mbmi->segment_id,
                                              SEG_LVL_SKIP);
  if (!mbmi->mb_skip_coeff)
628
    mbmi->mb_skip_coeff = vp9_read(r, vp9_get_pred_prob(cm, xd, PRED_MBSKIP));
John Koleszar's avatar
John Koleszar committed
629 630

  // Read the reference frame
631
  mbmi->ref_frame = read_ref_frame(pbi, r, mbmi->segment_id);
632

John Koleszar's avatar
John Koleszar committed
633 634 635 636
  // 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;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
637
    vp9_prob mv_ref_p[VP9_MVREFS - 1];
John Koleszar's avatar
John Koleszar committed
638

639 640 641
    const MV_REFERENCE_FRAME ref_frame = mbmi->ref_frame;
    struct scale_factors *sf0 = &xd->scale_factor[0];
    *sf0 = cm->active_ref_scale[mbmi->ref_frame - 1];
642 643

    {
644
      // Select the appropriate reference frame for this MB
Dmitry Kovalev's avatar
Dmitry Kovalev committed
645
      const int ref_fb_idx = cm->active_ref_idx[ref_frame - 1];
646

647 648
      setup_pre_planes(xd, &cm->yv12_fb[ref_fb_idx], NULL,
                       mb_row, mb_col, xd->scale_factor, xd->scale_factor_uv);
649

650 651 652 653 654
#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
655
      vp9_find_mv_refs(cm, xd, mi, use_prev_in_find_mv_refs ? prev_mi : NULL,
Paul Wilkins's avatar
Paul Wilkins committed
656 657
                       ref_frame, mbmi->ref_mvs[ref_frame],
                       cm->ref_frame_sign_bias);
Paul Wilkins's avatar
Paul Wilkins committed
658

659
      vp9_mv_ref_probs(cm, mv_ref_p, mbmi->mb_mode_context[ref_frame]);
660

661
      // If the segment level skip mode enabled
Paul Wilkins's avatar
Paul Wilkins committed
662 663
      if (vp9_segfeature_active(xd, mbmi->segment_id, SEG_LVL_SKIP)) {
        mbmi->mode = ZEROMV;
664
      } else {
665 666
        mbmi->mode = mbmi->sb_type > BLOCK_SIZE_MB16X16 ?
                                     read_sb_mv_ref(r, mv_ref_p)
667
                                   : read_mv_ref(r, mv_ref_p);
668
        vp9_accum_mv_refs(cm, mbmi->mode, mbmi->mb_mode_context[ref_frame]);
669 670 671 672 673 674 675
      }

      if (mbmi->mode != ZEROMV) {
        vp9_find_best_ref_mvs(xd,
                              mbmi->ref_mvs[ref_frame],
                              &nearest, &nearby);

676
        best_mv.as_int = mbmi->ref_mvs[ref_frame][0].as_int;
677
      }
678

679 680 681 682 683 684
#ifdef DEC_DEBUG
      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]);
#endif
Paul Wilkins's avatar
Paul Wilkins committed
685
    }
John Koleszar's avatar
John Koleszar committed
686

Dmitry Kovalev's avatar
Dmitry Kovalev committed
687
    if (mbmi->mode >= NEARESTMV && mbmi->mode <= SPLITMV) {
688
      mbmi->interp_filter = cm->mcomp_filter_type == SWITCHABLE
689
                                ? read_switchable_filter_type(pbi, r)
690
                                : cm->mcomp_filter_type;
691
    }
692

John Koleszar's avatar
John Koleszar committed
693 694
    if (cm->comp_pred_mode == COMP_PREDICTION_ONLY ||
        (cm->comp_pred_mode == HYBRID_PREDICTION &&
695
         vp9_read(r, vp9_get_pred_prob(cm, xd, PRED_COMP)))) {
John Koleszar's avatar
John Koleszar committed
696 697 698 699 700 701 702 703 704 705
      /* Since we have 3 reference frames, we can only have 3 unique
       * combinations of combinations of 2 different reference frames
       * (A-G, G-L or A-L). In the bitstream, we use this to simply
       * derive the second reference frame from the first reference
       * frame, by saying it's the next one in the enumerator, and
       * if that's > n_refs, then the second reference frame is the
       * first one in the enumerator. */
      mbmi->second_ref_frame = mbmi->ref_frame + 1;
      if (mbmi->second_ref_frame == 4)
        mbmi->second_ref_frame = 1;
706
      if (mbmi->second_ref_frame > 0) {
707 708 709 710
        const MV_REFERENCE_FRAME second_ref_frame = mbmi->second_ref_frame;
        struct scale_factors *sf1 = &xd->scale_factor[1];
        const int second_ref_fb_idx = cm->active_ref_idx[second_ref_frame - 1];
        *sf1 = cm->active_ref_scale[second_ref_frame - 1];
711

712 713
        setup_pre_planes(xd, NULL, &cm->yv12_fb[second_ref_fb_idx],
                         mb_row, mb_col, xd->scale_factor, xd->scale_factor_uv);
714

715 716 717
        vp9_find_mv_refs(cm, xd, mi,
                         use_prev_in_find_mv_refs ? prev_mi : NULL,
                         second_ref_frame, mbmi->ref_mvs[second_ref_frame],
Paul Wilkins's avatar
Paul Wilkins committed
718
                         cm->ref_frame_sign_bias);
Paul Wilkins's avatar
Paul Wilkins committed
719

720 721
        if (mbmi->mode != ZEROMV) {
          vp9_find_best_ref_mvs(xd,
722
                                mbmi->ref_mvs[second_ref_frame],
723 724
                                &nearest_second,
                                &nearby_second);
725
          best_mv_second.as_int = mbmi->ref_mvs[second_ref_frame][0].as_int;
726
        }
727
      }
Yaowu Xu's avatar
Yaowu Xu committed
728

John Koleszar's avatar
John Koleszar committed
729
    } else {
730 731 732 733
#if CONFIG_COMP_INTERINTRA_PRED
      if (pbi->common.use_interintra &&
          mbmi->mode >= NEARESTMV && mbmi->mode < SPLITMV &&
          mbmi->second_ref_frame == NONE) {
734
        mbmi->second_ref_frame = (vp9_read(r, pbi->common.fc.interintra_prob) ?
735 736 737 738 739 740
                                  INTRA_FRAME : NONE);
        // printf("-- %d (%d)\n", mbmi->second_ref_frame == INTRA_FRAME,
        //        pbi->common.fc.interintra_prob);
        pbi->common.fc.interintra_counts[
            mbmi->second_ref_frame == INTRA_FRAME]++;
        if (mbmi->second_ref_frame == INTRA_FRAME) {
741
          mbmi->interintra_mode = read_ymode(r, pbi->common.fc.ymode_prob);
742 743
          pbi->common.fc.ymode_counts[mbmi->interintra_mode]++;
#if SEPARATE_INTERINTRA_UV
744
          mbmi->interintra_uv_mode = read_uv_mode(r,
Dmitry Kovalev's avatar
Dmitry Kovalev committed
745
              pbi->common.fc.uv_mode_prob[mbmi->interintra_mode]);
746 747 748 749 750 751 752 753 754 755
          pbi->common.fc.uv_mode_counts[mbmi->interintra_mode]
                                       [mbmi->interintra_uv_mode]++;
#else
          mbmi->interintra_uv_mode = mbmi->interintra_mode;
#endif
          // printf("** %d %d\n",
          //        mbmi->interintra_mode, mbmi->interintra_uv_mode);
        }
      }
#endif
John Koleszar's avatar
John Koleszar committed
756
    }