vp9_decodemv.c 28.7 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 MB_PREDICTION_MODE read_intra_mode(vp9_reader *r, const vp9_prob *p) {
  MB_PREDICTION_MODE m = treed_read(r, vp9_intra_mode_tree, p);
40
41
42
  return m;
}

43
static int read_mb_segid(vp9_reader *r, MACROBLOCKD *xd) {
44
  return treed_read(r, vp9_segment_tree, xd->mb_segment_tree_probs);
Scott LaVarnway's avatar
Scott LaVarnway committed
45
}
46

47
static void set_segment_id(VP9_COMMON *cm, MB_MODE_INFO *mbmi,
48
49
                           int mi_row, int mi_col, int segment_id) {
  const int mi_index = mi_row * cm->mi_cols + mi_col;
50
  const BLOCK_SIZE_TYPE sb_type = mbmi->sb_type;
51
52
53
54
55
56
57
58
59
60
  const int bw = 1 << mi_width_log2(sb_type);
  const int bh = 1 << mi_height_log2(sb_type);
  const int ymis = MIN(cm->mi_rows - mi_row, bh);
  const int xmis = MIN(cm->mi_cols - mi_col, bw);
  int x, y;

  for (y = 0; y < ymis; y++) {
    for (x = 0; x < xmis; x++) {
      const int index = mi_index + (y * cm->mi_cols + x);
      cm->last_frame_seg_map[index] = segment_id;
61
62
63
64
    }
  }
}

65
66
67
68
69
70
71
72
73
74
75
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;
}

76

77
static void kfread_modes(VP9D_COMP *pbi, MODE_INFO *m,
78
                         int mi_row, int mi_col,
79
                         vp9_reader *r) {
80
  VP9_COMMON *const cm = &pbi->common;
81
  MACROBLOCKD *const xd = &pbi->mb;
82
  const int mis = cm->mode_info_stride;
83
84
  m->mbmi.ref_frame = INTRA_FRAME;

85
  // Read segmentation map if it is being updated explicitly this frame
John Koleszar's avatar
John Koleszar committed
86
  m->mbmi.segment_id = 0;
87
88
  if (xd->segmentation_enabled && xd->update_mb_segmentation_map) {
    m->mbmi.segment_id = read_mb_segid(r, xd);
89
    set_segment_id(cm, &m->mbmi, mi_row, mi_col, m->mbmi.segment_id);
John Koleszar's avatar
John Koleszar committed
90
91
  }

92
  m->mbmi.mb_skip_coeff = vp9_segfeature_active(xd, m->mbmi.segment_id,
93
94
                                                SEG_LVL_SKIP);
  if (!m->mbmi.mb_skip_coeff)
95
    m->mbmi.mb_skip_coeff = vp9_read(r, vp9_get_pred_prob(cm, xd, PRED_MBSKIP));
John Koleszar's avatar
John Koleszar committed
96

97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
  if (cm->txfm_mode == TX_MODE_SELECT &&
      m->mbmi.sb_type >= BLOCK_SIZE_SB8X8) {
    const int allow_16x16 = m->mbmi.sb_type >= BLOCK_SIZE_MB16X16;
    const int allow_32x32 = m->mbmi.sb_type >= BLOCK_SIZE_SB32X32;
    m->mbmi.txfm_size = select_txfm_size(cm, r, allow_16x16, allow_32x32);
  } else if (cm->txfm_mode >= ALLOW_32X32 &&
             m->mbmi.sb_type >= BLOCK_SIZE_SB32X32) {
    m->mbmi.txfm_size = TX_32X32;
  } else if (cm->txfm_mode >= ALLOW_16X16 &&
             m->mbmi.sb_type >= BLOCK_SIZE_MB16X16) {
    m->mbmi.txfm_size = TX_16X16;
  } else if (cm->txfm_mode >= ALLOW_8X8 &&
             m->mbmi.sb_type >= BLOCK_SIZE_SB8X8) {
    m->mbmi.txfm_size = TX_8X8;
  } else {
    m->mbmi.txfm_size = TX_4X4;
  }

115
  // luma mode
116
  m->mbmi.ref_frame = INTRA_FRAME;
117
118
119
120
  if (m->mbmi.sb_type >= BLOCK_SIZE_SB8X8) {
    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;
121
    m->mbmi.mode = read_intra_mode(r, cm->kf_y_mode_prob[A][L]);
122
  } else {
123
124
125
    int idx, idy;
    int bw = 1 << b_width_log2(m->mbmi.sb_type);
    int bh = 1 << b_height_log2(m->mbmi.sb_type);
126
127
128
129
130
131
132
133
134

    for (idy = 0; idy < 2; idy += bh) {
      for (idx = 0; idx < 2; idx += bw) {
        int ib = idy * 2 + idx;
        int k;
        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;
        m->bmi[ib].as_mode.first =
135
            read_intra_mode(r, cm->kf_y_mode_prob[A][L]);
136
137
138
139
140
141
        for (k = 1; k < bh; ++k)
          m->bmi[ib + k * 2].as_mode.first = m->bmi[ib].as_mode.first;
        for (k = 1; k < bw; ++k)
          m->bmi[ib + k].as_mode.first = m->bmi[ib].as_mode.first;
      }
    }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
142
    m->mbmi.mode = m->bmi[3].as_mode.first;
John Koleszar's avatar
John Koleszar committed
143
  }
Dmitry Kovalev's avatar
Dmitry Kovalev committed
144

145
  m->mbmi.uv_mode = read_intra_mode(r, cm->kf_uv_mode_prob[m->mbmi.mode]);
Scott LaVarnway's avatar
Scott LaVarnway committed
146
}
John Koleszar's avatar
John Koleszar committed
147

148
149
static int read_mv_component(vp9_reader *r,
                             const nmv_component *mvcomp, int usehp) {
150

151
  int mag, d, fr, hp;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
152
153
154
  const int sign = vp9_read(r, mvcomp->sign);
  const int mv_class = treed_read(r, vp9_mv_class_tree, mvcomp->classes);

155
  // Integer part
Dmitry Kovalev's avatar
Dmitry Kovalev committed
156
  if (mv_class == MV_CLASS_0) {
157
    d = treed_read(r, vp9_mv_class0_tree, mvcomp->class0);
158
  } else {
Dmitry Kovalev's avatar
Dmitry Kovalev committed
159
    int i;
160
    const int n = mv_class + CLASS0_BITS - 1;  // number of bits
Dmitry Kovalev's avatar
Dmitry Kovalev committed
161

162
    d = 0;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
163
164
    for (i = 0; i < n; ++i)
      d |= vp9_read(r, mvcomp->bits[i]) << i;
165
166
  }

167
168
169
  // Fractional part
  fr = treed_read(r, vp9_mv_fp_tree,
                  mv_class == MV_CLASS_0 ? mvcomp->class0_fp[d] : mvcomp->fp);
170
171


172
173
174
175
  // High precision part (if hp is not used, the default value of the hp is 1)
  hp = usehp ? vp9_read(r,
                        mv_class == MV_CLASS_0 ? mvcomp->class0_hp : mvcomp->hp)
             : 1;
176

177
178
179
  // result
  mag = vp9_get_mv_mag(mv_class, (d << 3) | (fr << 1) | hp) + 1;
  return sign ? -mag : mag;
180
181
}

182
static void update_nmv(vp9_reader *r, vp9_prob *const p,
183
                       const vp9_prob upd_p) {
184
  if (vp9_read(r, upd_p)) {
185
#ifdef LOW_PRECISION_MV_UPDATE
186
    *p = (vp9_read_literal(r, 7) << 1) | 1;
187
#else
188
    *p = (vp9_read_literal(r, 8));
189
190
191
192
#endif
  }
}

193
static void read_nmvprobs(vp9_reader *r, nmv_context *mvctx,
194
195
                          int usehp) {
  int i, j, k;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
196

197
#ifdef MV_GROUP_UPDATE
198
  if (!vp9_read_bit(r))
Dmitry Kovalev's avatar
Dmitry Kovalev committed
199
    return;
200
#endif
Dmitry Kovalev's avatar
Dmitry Kovalev committed
201
  for (j = 0; j < MV_JOINTS - 1; ++j)
202
    update_nmv(r, &mvctx->joints[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
203

204
  for (i = 0; i < 2; ++i) {
205
    update_nmv(r, &mvctx->comps[i].sign, VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
206
    for (j = 0; j < MV_CLASSES - 1; ++j)
207
      update_nmv(r, &mvctx->comps[i].classes[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
208
209

    for (j = 0; j < CLASS0_SIZE - 1; ++j)
210
      update_nmv(r, &mvctx->comps[i].class0[j], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
211
212

    for (j = 0; j < MV_OFFSET_BITS; ++j)
213
      update_nmv(r, &mvctx->comps[i].bits[j], VP9_NMV_UPDATE_PROB);
214
215
216
  }

  for (i = 0; i < 2; ++i) {
217
    for (j = 0; j < CLASS0_SIZE; ++j)
218
      for (k = 0; k < 3; ++k)
219
        update_nmv(r, &mvctx->comps[i].class0_fp[j][k], VP9_NMV_UPDATE_PROB);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
220
221

    for (j = 0; j < 3; ++j)
222
      update_nmv(r, &mvctx->comps[i].fp[j], VP9_NMV_UPDATE_PROB);
223
224
225
226
  }

  if (usehp) {
    for (i = 0; i < 2; ++i) {
227
228
      update_nmv(r, &mvctx->comps[i].class0_hp, VP9_NMV_UPDATE_PROB);
      update_nmv(r, &mvctx->comps[i].hp, VP9_NMV_UPDATE_PROB);
229
230
231
232
    }
  }
}

233
// Read the referncence frame
234
static MV_REFERENCE_FRAME read_ref_frame(VP9D_COMP *pbi,
235
                                         vp9_reader *r,
236
                                         int segment_id) {
John Koleszar's avatar
John Koleszar committed
237
  MV_REFERENCE_FRAME ref_frame;
238
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
239
240
  MACROBLOCKD *const xd = &pbi->mb;

Dmitry Kovalev's avatar
Dmitry Kovalev committed
241
  int seg_ref_count = 0;
242
243
244
245
246
247
248
  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
249
250
251

  // If segment coding enabled does the segment allow for more than one
  // possible reference frame
252
253
  if (seg_ref_active)
    seg_ref_count = intra + last + golden + altref;
John Koleszar's avatar
John Koleszar committed
254
255
256

  // Segment reference frame features not available or allows for
  // multiple reference frame options
257
  if (!seg_ref_active || seg_ref_count > 1) {
John Koleszar's avatar
John Koleszar committed
258
259
260
261
    // 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
262
    vp9_prob pred_prob = vp9_get_pred_prob(cm, xd, PRED_REF);
John Koleszar's avatar
John Koleszar committed
263
264

    // Read the prediction status flag
265
    unsigned char prediction_flag = vp9_read(r, pred_prob);
John Koleszar's avatar
John Koleszar committed
266
267

    // Store the prediction flag.
Paul Wilkins's avatar
Paul Wilkins committed
268
    vp9_set_pred_flag(xd, PRED_REF, prediction_flag);
John Koleszar's avatar
John Koleszar committed
269
270

    // Get the predicted reference frame.
Paul Wilkins's avatar
Paul Wilkins committed
271
    pred_ref = vp9_get_pred_ref(cm, xd);
John Koleszar's avatar
John Koleszar committed
272
273
274
275

    // If correctly predicted then use the predicted value
    if (prediction_flag) {
      ref_frame = pred_ref;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
276
277
    } else {
      // decode the explicitly coded value
278
      vp9_prob mod_refprobs[PREDICTION_PROBS];
279
280
      vpx_memcpy(mod_refprobs, cm->mod_refprobs[pred_ref],
                 sizeof(mod_refprobs));
John Koleszar's avatar
John Koleszar committed
281
282
283
284

      // If segment coding enabled blank out options that cant occur by
      // setting the branch probability to 0.
      if (seg_ref_active) {
285
286
287
        mod_refprobs[INTRA_FRAME] *= intra;
        mod_refprobs[LAST_FRAME] *= last;
        mod_refprobs[GOLDEN_FRAME] *= golden * altref;
John Koleszar's avatar
John Koleszar committed
288
289
290
291
292
293
294
      }

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

      // Do we need to decode the Intra/Inter branch
      if (mod_refprobs[0])
295
        ref_frame = vp9_read(r, mod_refprobs[0]);
John Koleszar's avatar
John Koleszar committed
296
297
298
299
300
301
      else
        ref_frame++;

      if (ref_frame) {
        // Do we need to decode the Last/Gf_Arf branch
        if (mod_refprobs[1])
302
          ref_frame += vp9_read(r, mod_refprobs[1]);
303
        else
John Koleszar's avatar
John Koleszar committed
304
305
306
307
          ref_frame++;

        if (ref_frame > 1) {
          // Do we need to decode the GF/Arf branch
308
          if (mod_refprobs[2]) {
309
            ref_frame += vp9_read(r, mod_refprobs[2]);
310
          } else {
311
312
313
314
315
316
            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
317
          }
318
        }
John Koleszar's avatar
John Koleszar committed
319
      }
320
    }
Dmitry Kovalev's avatar
Dmitry Kovalev committed
321
322
  } else {
    // Segment reference frame features are enabled
John Koleszar's avatar
John Koleszar committed
323
324
325
    // 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
326
327
    vp9_set_pred_flag(xd, PRED_REF, 1);
    ref_frame = vp9_get_pred_ref(cm, xd);
John Koleszar's avatar
John Koleszar committed
328
329
  }

330
  return ref_frame;
331
}
John Koleszar's avatar
John Koleszar committed
332

333
334
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
335
}
John Koleszar's avatar
John Koleszar committed
336

Scott LaVarnway's avatar
Scott LaVarnway committed
337
#ifdef VPX_MODE_COUNT
338
unsigned int vp9_mv_cont_count[5][4] = {
John Koleszar's avatar
John Koleszar committed
339
340
341
342
343
  { 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
344
};
Scott LaVarnway's avatar
Scott LaVarnway committed
345
#endif
John Koleszar's avatar
John Koleszar committed
346

347
static void read_switchable_interp_probs(VP9D_COMP* const pbi, vp9_reader *r) {
348
  VP9_COMMON *const cm = &pbi->common;
349
  int i, j;
350
351
352
  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);
353
}
John Koleszar's avatar
John Koleszar committed
354

355
356
357
358
359
360
361
362
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) {
363
  VP9_COMMON *const cm = &pbi->common;
John Koleszar's avatar
John Koleszar committed
364

365
  if (cm->frame_type != KEY_FRAME) {
366
367
    nmv_context *const nmvc = &pbi->common.fc.nmvc;
    MACROBLOCKD *const xd = &pbi->mb;
368
    int i, j;
369

370
    if (cm->mcomp_filter_type == SWITCHABLE)
371
      read_switchable_interp_probs(pbi, r);
372

373
374
375
376
    // 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
377
378
379

    // Computes a modified set of probabilities for use when reference
    // frame prediction fails.
Paul Wilkins's avatar
Paul Wilkins committed
380
    vp9_compute_mod_refprobs(cm);
John Koleszar's avatar
John Koleszar committed
381

382
383
    cm->comp_pred_mode = read_comp_pred_mode(r);
    if (cm->comp_pred_mode == HYBRID_PREDICTION)
John Koleszar's avatar
John Koleszar committed
384
      for (i = 0; i < COMP_PRED_CONTEXTS; i++)
385
        cm->prob_comppred[i] = vp9_read_prob(r);
John Koleszar's avatar
John Koleszar committed
386

387
    // VP9_INTRA_MODES
388
    if (vp9_read_bit(r))
389
      for (i = 0; i < VP9_INTRA_MODES - 1; ++i)
390
        cm->fc.y_mode_prob[i] = vp9_read_prob(r);
391

392
393
394
395
396
    for (j = 0; j < NUM_PARTITION_CONTEXTS; ++j)
      if (vp9_read_bit(r))
        for (i = 0; i < PARTITION_TYPES - 1; ++i)
          cm->fc.partition_prob[j][i] = vp9_read_prob(r);

397
    read_nmvprobs(r, nmvc, xd->allow_high_precision_mv);
John Koleszar's avatar
John Koleszar committed
398
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
399
}
John Koleszar's avatar
John Koleszar committed
400

401
402
403
// 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
404
static int read_mb_segment_id(VP9D_COMP *pbi, int mi_row, int mi_col,
405
                              vp9_reader *r) {
406
  VP9_COMMON *const cm = &pbi->common;
407
  MACROBLOCKD *const xd = &pbi->mb;
408
409
  MODE_INFO *const mi = xd->mode_info_context;
  MB_MODE_INFO *const mbmi = &mi->mbmi;
John Koleszar's avatar
John Koleszar committed
410

411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
  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
427
428
      segment_id = pred_flag ? vp9_get_pred_mi_segid(cm, mbmi->sb_type,
                                                     mi_row, mi_col)
Paul Wilkins's avatar
Paul Wilkins committed
429
                             : read_mb_segid(r, xd);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
430
    } else {
431
      segment_id = read_mb_segid(r, xd);  // Normal unpredicted coding mode
432
    }
433

434
    set_segment_id(cm, mbmi, mi_row, mi_col, segment_id);  // Side effect
435
    return segment_id;
John Koleszar's avatar
John Koleszar committed
436
  } else {
437
    return vp9_get_pred_mi_segid(cm, mbmi->sb_type, mi_row, mi_col);
John Koleszar's avatar
John Koleszar committed
438
  }
439
}
440

Dmitry Kovalev's avatar
Dmitry Kovalev committed
441
442
443
444
445
446
447
448
449
450
451

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);
}

452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
static INLINE void decode_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_nmv_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_increment_nmv(&diff, ref, counts, usehp);

  mv->row = diff.row + ref->row;
  mv->col = diff.col + ref->col;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
470
471
}

472
static INLINE INTERPOLATIONFILTERTYPE read_switchable_filter_type(
473
474
    VP9D_COMP *pbi, vp9_reader *r) {
  const int index = treed_read(r, vp9_switchable_interp_tree,
475
476
477
478
479
                               vp9_get_pred_probs(&pbi->common, &pbi->mb,
                                                  PRED_SWITCHABLE_INTERP));
  return vp9_switchable_interp[index];
}

480
static void read_mb_modes_mv(VP9D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
481
                             int mi_row, int mi_col,
482
                             vp9_reader *r) {
483
  VP9_COMMON *const cm = &pbi->common;
484
  nmv_context *const nmvc = &cm->fc.nmvc;
485
  MACROBLOCKD *const xd = &pbi->mb;
John Koleszar's avatar
John Koleszar committed
486

487
488
  int_mv *const mv0 = &mbmi->mv[0];
  int_mv *const mv1 = &mbmi->mv[1];
489
490
491
  BLOCK_SIZE_TYPE bsize = mi->mbmi.sb_type;
  int bw = 1 << b_width_log2(bsize);
  int bh = 1 << b_height_log2(bsize);
Dmitry Kovalev's avatar
Dmitry Kovalev committed
492

493
  int mb_to_left_edge, mb_to_right_edge, mb_to_top_edge, mb_to_bottom_edge;
494
  int j, idx, idy;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
495

John Koleszar's avatar
John Koleszar committed
496
497
  mbmi->need_to_clamp_mvs = 0;
  mbmi->need_to_clamp_secondmv = 0;
498
  mbmi->second_ref_frame = NONE;
Dmitry Kovalev's avatar
Dmitry Kovalev committed
499

500
501
502
503
  // Make sure the MACROBLOCKD mode info pointer is pointed at the
  // correct entry for the current macroblock.
  xd->mode_info_context = mi;

Dmitry Kovalev's avatar
Dmitry Kovalev committed
504
505
506
  // 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
507
508
  set_mi_row_col(cm, xd, mi_row, 1 << mi_height_log2(bsize),
                         mi_col, 1 << mi_width_log2(bsize));
509

510
511
  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
512
513
  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
514
515

  // Read the macroblock segment id.
516
  mbmi->segment_id = read_mb_segment_id(pbi, mi_row, mi_col, r);
John Koleszar's avatar
John Koleszar committed
517

518
519
520
  mbmi->mb_skip_coeff = vp9_segfeature_active(xd, mbmi->segment_id,
                                              SEG_LVL_SKIP);
  if (!mbmi->mb_skip_coeff)
521
    mbmi->mb_skip_coeff = vp9_read(r, vp9_get_pred_prob(cm, xd, PRED_MBSKIP));
John Koleszar's avatar
John Koleszar committed
522
523

  // Read the reference frame
524
  mbmi->ref_frame = read_ref_frame(pbi, r, mbmi->segment_id);
525

526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
  if (cm->txfm_mode == TX_MODE_SELECT &&
      (mbmi->mb_skip_coeff == 0 || mbmi->ref_frame == INTRA_FRAME) &&
      bsize >= BLOCK_SIZE_SB8X8) {
    const int allow_16x16 = bsize >= BLOCK_SIZE_MB16X16;
    const int allow_32x32 = bsize >= BLOCK_SIZE_SB32X32;
    mbmi->txfm_size = select_txfm_size(cm, r, allow_16x16, allow_32x32);
  } else if (bsize >= BLOCK_SIZE_SB32X32 &&
             cm->txfm_mode >= ALLOW_32X32) {
    mbmi->txfm_size = TX_32X32;
  } else if (cm->txfm_mode >= ALLOW_16X16 &&
             bsize >= BLOCK_SIZE_MB16X16) {
    mbmi->txfm_size = TX_16X16;
  } else if (cm->txfm_mode >= ALLOW_8X8 && (bsize >= BLOCK_SIZE_SB8X8)) {
    mbmi->txfm_size = TX_8X8;
  } else {
    mbmi->txfm_size = TX_4X4;
  }

John Koleszar's avatar
John Koleszar committed
544
545
546
547
  // 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
548
    vp9_prob mv_ref_p[VP9_MVREFS - 1];
549
    const MV_REFERENCE_FRAME ref_frame = mbmi->ref_frame;
550
551

    {
552
553
554
555
556
#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
557
558
      vp9_find_mv_refs(cm, xd, mi, xd->prev_mode_info_context, ref_frame,
                       mbmi->ref_mvs[ref_frame], cm->ref_frame_sign_bias);
Paul Wilkins's avatar
Paul Wilkins committed
559

560
      vp9_mv_ref_probs(cm, mv_ref_p, mbmi->mb_mode_context[ref_frame]);
561

562
      // If the segment level skip mode enabled
Paul Wilkins's avatar
Paul Wilkins committed
563
564
      if (vp9_segfeature_active(xd, mbmi->segment_id, SEG_LVL_SKIP)) {
        mbmi->mode = ZEROMV;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
565
566
      } else if (bsize >= BLOCK_SIZE_SB8X8) {
        mbmi->mode = read_sb_mv_ref(r, mv_ref_p);
567
        vp9_accum_mv_refs(cm, mbmi->mode, mbmi->mb_mode_context[ref_frame]);
568
569
      }

Ronald S. Bultje's avatar
Ronald S. Bultje committed
570
      if (bsize < BLOCK_SIZE_SB8X8 || mbmi->mode != ZEROMV) {
571
572
573
574
        vp9_find_best_ref_mvs(xd,
                              mbmi->ref_mvs[ref_frame],
                              &nearest, &nearby);

575
        best_mv.as_int = mbmi->ref_mvs[ref_frame][0].as_int;
576
      }
577

578
579
580
581
582
583
#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
584
    }
John Koleszar's avatar
John Koleszar committed
585

586
587
588
    mbmi->interp_filter = cm->mcomp_filter_type == SWITCHABLE
                              ? read_switchable_filter_type(pbi, r)
                              : cm->mcomp_filter_type;
589

John Koleszar's avatar
John Koleszar committed
590
591
    if (cm->comp_pred_mode == COMP_PREDICTION_ONLY ||
        (cm->comp_pred_mode == HYBRID_PREDICTION &&
592
         vp9_read(r, vp9_get_pred_prob(cm, xd, PRED_COMP)))) {
John Koleszar's avatar
John Koleszar committed
593
594
595
596
597
598
599
600
601
602
      /* 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;
603
      if (mbmi->second_ref_frame > 0) {
604
        const MV_REFERENCE_FRAME second_ref_frame = mbmi->second_ref_frame;
605

606
        vp9_find_mv_refs(cm, xd, mi, xd->prev_mode_info_context,
607
                         second_ref_frame, mbmi->ref_mvs[second_ref_frame],
Paul Wilkins's avatar
Paul Wilkins committed
608
                         cm->ref_frame_sign_bias);
Paul Wilkins's avatar
Paul Wilkins committed
609

Ronald S. Bultje's avatar
Ronald S. Bultje committed
610
        if (bsize < BLOCK_SIZE_SB8X8 || mbmi->mode != ZEROMV) {
611
          vp9_find_best_ref_mvs(xd,
612
                                mbmi->ref_mvs[second_ref_frame],
613
614
                                &nearest_second,
                                &nearby_second);
615
          best_mv_second.as_int = mbmi->ref_mvs[second_ref_frame][0].as_int;
616
        }
617
      }
John Koleszar's avatar
John Koleszar committed
618
    }
619

John Koleszar's avatar
John Koleszar committed
620
    mbmi->uv_mode = DC_PRED;
Ronald S. Bultje's avatar
Ronald S. Bultje committed
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
    if (mbmi->sb_type < BLOCK_SIZE_SB8X8) {
      mbmi->need_to_clamp_mvs = 0;
      for (idy = 0; idy < 2; idy += bh) {
        for (idx = 0; idx < 2; idx += bw) {
          int_mv blockmv, secondmv;
          int blockmode;
          int i;
          j = idy * 2 + idx;

          blockmode = read_sb_mv_ref(r, mv_ref_p);
          vp9_accum_mv_refs(cm, blockmode, mbmi->mb_mode_context[ref_frame]);
          if (blockmode == NEARESTMV || blockmode == NEARMV) {
            MV_REFERENCE_FRAME rf2 = mbmi->second_ref_frame;
            vp9_append_sub8x8_mvs_for_idx(cm, xd, &nearest, &nearby, j, 0);
            if (rf2 > 0) {
              vp9_append_sub8x8_mvs_for_idx(cm, xd,  &nearest_second,
                                            &nearby_second, j, 1);
638
            }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
639
          }
640

Ronald S. Bultje's avatar
Ronald S. Bultje committed
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
          switch (blockmode) {
            case NEWMV:
              decode_mv(r, &blockmv.as_mv, &best_mv.as_mv, nmvc,
                         &cm->fc.NMVcount, xd->allow_high_precision_mv);

              if (mbmi->second_ref_frame > 0)
                decode_mv(r, &secondmv.as_mv, &best_mv_second.as_mv, nmvc,
                          &cm->fc.NMVcount, xd->allow_high_precision_mv);

#ifdef VPX_MODE_COUNT
              vp9_mv_cont_count[mv_contz][3]++;
#endif
              break;
            case NEARESTMV:
              blockmv.as_int = nearest.as_int;
              if (mbmi->second_ref_frame > 0)
                secondmv.as_int = nearest_second.as_int;
#ifdef VPX_MODE_COUNT
              vp9_mv_cont_count[mv_contz][0]++;
#endif
              break;
            case NEARMV:
              blockmv.as_int = nearby.as_int;
              if (mbmi->second_ref_frame > 0)
                secondmv.as_int = nearby_second.as_int;
#ifdef VPX_MODE_COUNT
              vp9_mv_cont_count[mv_contz][1]++;
#endif
              break;
            case ZEROMV:
              blockmv.as_int = 0;
              if (mbmi->second_ref_frame > 0)
                secondmv.as_int = 0;
#ifdef VPX_MODE_COUNT
              vp9_mv_cont_count[mv_contz][2]++;
#endif
              break;
            default:
              break;
John Koleszar's avatar
John Koleszar committed
680
          }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
681
682
683
684
685
686
687
688
689
          mi->bmi[j].as_mv[0].as_int = blockmv.as_int;
          if (mbmi->second_ref_frame > 0)
            mi->bmi[j].as_mv[1].as_int = secondmv.as_int;

          for (i = 1; i < bh; ++i)
            vpx_memcpy(&mi->bmi[j + i * 2], &mi->bmi[j], sizeof(mi->bmi[j]));
          for (i = 1; i < bw; ++i)
            vpx_memcpy(&mi->bmi[j + i], &mi->bmi[j], sizeof(mi->bmi[j]));
          mi->mbmi.mode = blockmode;
690
        }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
691
      }
John Koleszar's avatar
John Koleszar committed
692

Ronald S. Bultje's avatar
Ronald S. Bultje committed
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
      mv0->as_int = mi->bmi[3].as_mv[0].as_int;
      mv1->as_int = mi->bmi[3].as_mv[1].as_int;
    } else {
      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);
          if (mbmi->second_ref_frame > 0)
            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);
          if (mbmi->second_ref_frame > 0)
            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;
          if (mbmi->second_ref_frame > 0)
            mv1->as_int = 0;
          break;

        case NEWMV:
          decode_mv(r, &mv0->as_mv, &best_mv.as_mv, nmvc, &cm->fc.NMVcount,
                    xd->allow_high_precision_mv);
          mbmi->need_to_clamp_mvs = check_mv_bounds(mv0,
                                                    mb_to_left_edge,
734
735
736
                                                    mb_to_right_edge,
                                                    mb_to_top_edge,
                                                    mb_to_bottom_edge);
Ronald S. Bultje's avatar
Ronald S. Bultje committed
737
738
739
740
741
742
743
744
745
746
747
748

          if (mbmi->second_ref_frame > 0) {
            decode_mv(r, &mv1->as_mv, &best_mv_second.as_mv, nmvc,
                      &cm->fc.NMVcount, xd->allow_high_precision_mv);
            mbmi->need_to_clamp_secondmv = check_mv_bounds(mv1,
                                                             mb_to_left_edge,
                                                             mb_to_right_edge,
                                                             mb_to_top_edge,
                                                             mb_to_bottom_edge);
          }
          break;
        default:
John Koleszar's avatar
John Koleszar committed
749
#if CONFIG_DEBUG
Ronald S. Bultje's avatar
Ronald S. Bultje committed
750
          assert(0);
John Koleszar's avatar
John Koleszar committed
751
#endif
Ronald S. Bultje's avatar
Ronald S. Bultje committed
752
753
          break;
      }
Scott LaVarnway's avatar
Scott LaVarnway committed
754
    }
John Koleszar's avatar
John Koleszar committed
755
  } else {
756
757
    // required for left and above block mv
    mv0->as_int = 0;
John Koleszar's avatar
John Koleszar committed
758

759
    if (bsize >= BLOCK_SIZE_SB8X8) {
760
761
      mbmi->mode = read_intra_mode(r, cm->fc.y_mode_prob);
      cm->fc.y_mode_counts[mbmi->mode]++;
762
    } else {
763
764
765
      int idx, idy;
      for (idy = 0; idy < 2; idy += bh) {
        for (idx = 0; idx < 2; idx += bw) {
766
          int ib = idy * 2 + idx, k;
767
          int m = read_intra_mode(r, cm->fc.y_mode_prob);
768
          mi->bmi[ib].as_mode.first = m;
769
          cm->fc.y_mode_counts[m]++;
770
771
772
773
          for (k = 1; k < bh; ++k)
            mi->bmi[ib + k * 2].as_mode.first = m;
          for (k = 1; k < bw; ++k)
            mi->bmi[ib + k].as_mode.first = m;
774
775
        }
      }
Ronald S. Bultje's avatar
Ronald S. Bultje committed
776
      mbmi->mode = mi->bmi[3].as_mode.first;
John Koleszar's avatar
John Koleszar committed
777
    }
John Koleszar's avatar
John Koleszar committed
778

779
    mbmi->uv_mode = read_intra_mode(r, cm->fc.uv_mode_prob[mbmi->mode]);
Jingning Han's avatar
Jingning Han committed
780
    cm->fc.uv_mode_counts[mbmi->mode][mbmi->uv_mode]++;
John Koleszar's avatar
John Koleszar committed
781
  }
Scott LaVarnway's avatar
Scott LaVarnway committed
782
}
John Koleszar's avatar
John Koleszar committed
783

784
void vp9_decode_mode_mvs_init(VP9D_COMP* const pbi, vp9_reader *r) {
785
  VP9_COMMON *cm = &pbi->common;
786
  int k;
787

788
  // TODO(jkoleszar): does this clear more than MBSKIP_CONTEXTS? Maybe remove.
789
  vpx_memset(cm->mbskip_pred_probs, 0, sizeof(cm->mbskip_pred_probs));
790
791
  for (k = 0; k < MBSKIP_CONTEXTS; ++k)
    cm->mbskip_pred_probs[k] = vp9_read_prob(r);
792

793
  mb_mode_mv_init(pbi, r);
794
}
795

796
797
void vp9_decode_mb_mode_mv(VP9D_COMP* const pbi,
                           MACROBLOCKD* const xd,
798
799
                           int mi_row,
                           int mi_col,
800
                           vp9_reader *r) {
801
  VP9_COMMON *const cm = &pbi->common;
802
  MODE_INFO *mi = xd->mode_info_context;
803
  MB_MODE_INFO *const mbmi = &mi->mbmi;
804

805
  if (cm->frame_type == KEY_FRAME) {
806
    kfread_modes(pbi, mi, mi_row, mi_col, r);
807
  } else {
Yunqing Wang's avatar
Yunqing Wang committed
808
    read_mb_modes_mv(pbi, mi, &mi->mbmi, mi_row, mi_col, r);
809
  }
810

811
812
813
814
815
  if (1) {
    const int bw = 1 << mi_width_log2(mbmi->sb_type);
    const int bh = 1 << mi_height_log2(mbmi->sb_type);
    const int y_mis = MIN(bh, cm->mi_rows - mi_row);
    const int x_mis = MIN(bw, cm->mi_cols - mi_col);
816
817
818
    const int mis = cm->mode_info_stride;
    int x, y;

819
820
    for (y = 0; y < y_mis; y++)
      for (x = !y; x < x_mis; x++)
821
822
        mi[y * mis + x] = *mi;
  }
823
}