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comparison: media/libvpx/vp9/decoder/vp9_decodemv.c

media/libvpx/vp9/decoder/vp9_decodemv.c

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1 /*
2 Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * 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.
9 */
10
11 #include <assert.h>
12
13 #include "vp9/common/vp9_common.h"
14 #include "vp9/common/vp9_entropy.h"
15 #include "vp9/common/vp9_entropymode.h"
16 #include "vp9/common/vp9_entropymv.h"
17 #include "vp9/common/vp9_findnearmv.h"
18 #include "vp9/common/vp9_mvref_common.h"
19 #include "vp9/common/vp9_pred_common.h"
20 #include "vp9/common/vp9_reconinter.h"
21 #include "vp9/common/vp9_seg_common.h"
22
23 #include "vp9/decoder/vp9_decodemv.h"
24 #include "vp9/decoder/vp9_decodframe.h"
25 #include "vp9/decoder/vp9_onyxd_int.h"
26 #include "vp9/decoder/vp9_treereader.h"
27
28 static MB_PREDICTION_MODE read_intra_mode(vp9_reader *r, const vp9_prob *p) {
29 return (MB_PREDICTION_MODE)treed_read(r, vp9_intra_mode_tree, p);
30 }
31
32 static MB_PREDICTION_MODE read_intra_mode_y(VP9_COMMON *cm, vp9_reader *r,
33 int size_group) {
34 const MB_PREDICTION_MODE y_mode = read_intra_mode(r,
35 cm->fc.y_mode_prob[size_group]);
36 if (!cm->frame_parallel_decoding_mode)
37 ++cm->counts.y_mode[size_group][y_mode];
38 return y_mode;
39 }
40
41 static MB_PREDICTION_MODE read_intra_mode_uv(VP9_COMMON *cm, vp9_reader *r,
42 MB_PREDICTION_MODE y_mode) {
43 const MB_PREDICTION_MODE uv_mode = read_intra_mode(r,
44 cm->fc.uv_mode_prob[y_mode]);
45 if (!cm->frame_parallel_decoding_mode)
46 ++cm->counts.uv_mode[y_mode][uv_mode];
47 return uv_mode;
48 }
49
50 static MB_PREDICTION_MODE read_inter_mode(VP9_COMMON *cm, vp9_reader *r,
51 int ctx) {
52 const int mode = treed_read(r, vp9_inter_mode_tree,
53 cm->fc.inter_mode_probs[ctx]);
54 if (!cm->frame_parallel_decoding_mode)
55 ++cm->counts.inter_mode[ctx][mode];
56
57 return NEARESTMV + mode;
58 }
59
60 static int read_segment_id(vp9_reader *r, const struct segmentation *seg) {
61 return treed_read(r, vp9_segment_tree, seg->tree_probs);
62 }
63
64 static TX_SIZE read_selected_tx_size(VP9_COMMON *cm, MACROBLOCKD *xd,
65 TX_SIZE max_tx_size, vp9_reader *r) {
66 const int ctx = vp9_get_pred_context_tx_size(xd);
67 const vp9_prob *tx_probs = get_tx_probs(max_tx_size, ctx, &cm->fc.tx_probs);
68 TX_SIZE tx_size = vp9_read(r, tx_probs[0]);
69 if (tx_size != TX_4X4 && max_tx_size >= TX_16X16) {
70 tx_size += vp9_read(r, tx_probs[1]);
71 if (tx_size != TX_8X8 && max_tx_size >= TX_32X32)
72 tx_size += vp9_read(r, tx_probs[2]);
73 }
74
75 if (!cm->frame_parallel_decoding_mode)
76 ++get_tx_counts(max_tx_size, ctx, &cm->counts.tx)[tx_size];
77 return tx_size;
78 }
79
80 static TX_SIZE read_tx_size(VP9_COMMON *cm, MACROBLOCKD *xd, TX_MODE tx_mode,
81 BLOCK_SIZE bsize, int allow_select, vp9_reader *r) {
82 const TX_SIZE max_tx_size = max_txsize_lookup[bsize];
83 if (allow_select && tx_mode == TX_MODE_SELECT && bsize >= BLOCK_8X8)
84 return read_selected_tx_size(cm, xd, max_tx_size, r);
85 else
86 return MIN(max_tx_size, tx_mode_to_biggest_tx_size[tx_mode]);
87 }
88
89 static void set_segment_id(VP9_COMMON *cm, BLOCK_SIZE bsize,
90 int mi_row, int mi_col, int segment_id) {
91 const int mi_offset = mi_row * cm->mi_cols + mi_col;
92 const int bw = num_8x8_blocks_wide_lookup[bsize];
93 const int bh = num_8x8_blocks_high_lookup[bsize];
94 const int xmis = MIN(cm->mi_cols - mi_col, bw);
95 const int ymis = MIN(cm->mi_rows - mi_row, bh);
96 int x, y;
97
98 assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
99
100 for (y = 0; y < ymis; y++)
101 for (x = 0; x < xmis; x++)
102 cm->last_frame_seg_map[mi_offset + y * cm->mi_cols + x] = segment_id;
103 }
104
105 static int read_intra_segment_id(VP9_COMMON *const cm, MACROBLOCKD *const xd,
106 int mi_row, int mi_col,
107 vp9_reader *r) {
108 struct segmentation *const seg = &cm->seg;
109 const BLOCK_SIZE bsize = xd->mi_8x8[0]->mbmi.sb_type;
110 int segment_id;
111
112 if (!seg->enabled)
113 return 0; // Default for disabled segmentation
114
115 if (!seg->update_map)
116 return 0;
117
118 segment_id = read_segment_id(r, seg);
119 set_segment_id(cm, bsize, mi_row, mi_col, segment_id);
120 return segment_id;
121 }
122
123 static int read_inter_segment_id(VP9_COMMON *const cm, MACROBLOCKD *const xd,
124 int mi_row, int mi_col, vp9_reader *r) {
125 struct segmentation *const seg = &cm->seg;
126 const BLOCK_SIZE bsize = xd->mi_8x8[0]->mbmi.sb_type;
127 int pred_segment_id, segment_id;
128
129 if (!seg->enabled)
130 return 0; // Default for disabled segmentation
131
132 pred_segment_id = vp9_get_segment_id(cm, cm->last_frame_seg_map,
133 bsize, mi_row, mi_col);
134 if (!seg->update_map)
135 return pred_segment_id;
136
137 if (seg->temporal_update) {
138 const vp9_prob pred_prob = vp9_get_pred_prob_seg_id(seg, xd);
139 const int pred_flag = vp9_read(r, pred_prob);
140 vp9_set_pred_flag_seg_id(xd, pred_flag);
141 segment_id = pred_flag ? pred_segment_id
142 : read_segment_id(r, seg);
143 } else {
144 segment_id = read_segment_id(r, seg);
145 }
146 set_segment_id(cm, bsize, mi_row, mi_col, segment_id);
147 return segment_id;
148 }
149
150 static int read_skip_coeff(VP9_COMMON *cm, const MACROBLOCKD *xd,
151 int segment_id, vp9_reader *r) {
152 if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
153 return 1;
154 } else {
155 const int ctx = vp9_get_pred_context_mbskip(xd);
156 const int skip = vp9_read(r, cm->fc.mbskip_probs[ctx]);
157 if (!cm->frame_parallel_decoding_mode)
158 ++cm->counts.mbskip[ctx][skip];
159 return skip;
160 }
161 }
162
163 static void read_intra_frame_mode_info(VP9_COMMON *const cm,
164 MACROBLOCKD *const xd,
165 MODE_INFO *const m,
166 int mi_row, int mi_col, vp9_reader *r) {
167 MB_MODE_INFO *const mbmi = &m->mbmi;
168 const BLOCK_SIZE bsize = mbmi->sb_type;
169 const MODE_INFO *above_mi = xd->mi_8x8[-cm->mode_info_stride];
170 const MODE_INFO *left_mi = xd->left_available ? xd->mi_8x8[-1] : NULL;
171
172 mbmi->segment_id = read_intra_segment_id(cm, xd, mi_row, mi_col, r);
173 mbmi->skip_coeff = read_skip_coeff(cm, xd, mbmi->segment_id, r);
174 mbmi->tx_size = read_tx_size(cm, xd, cm->tx_mode, bsize, 1, r);
175 mbmi->ref_frame[0] = INTRA_FRAME;
176 mbmi->ref_frame[1] = NONE;
177
178 if (bsize >= BLOCK_8X8) {
179 const MB_PREDICTION_MODE A = above_block_mode(m, above_mi, 0);
180 const MB_PREDICTION_MODE L = left_block_mode(m, left_mi, 0);
181 mbmi->mode = read_intra_mode(r, vp9_kf_y_mode_prob[A][L]);
182 } else {
183 // Only 4x4, 4x8, 8x4 blocks
184 const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
185 const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
186 int idx, idy;
187
188 for (idy = 0; idy < 2; idy += num_4x4_h) {
189 for (idx = 0; idx < 2; idx += num_4x4_w) {
190 const int ib = idy * 2 + idx;
191 const MB_PREDICTION_MODE A = above_block_mode(m, above_mi, ib);
192 const MB_PREDICTION_MODE L = left_block_mode(m, left_mi, ib);
193 const MB_PREDICTION_MODE b_mode = read_intra_mode(r,
194 vp9_kf_y_mode_prob[A][L]);
195 m->bmi[ib].as_mode = b_mode;
196 if (num_4x4_h == 2)
197 m->bmi[ib + 2].as_mode = b_mode;
198 if (num_4x4_w == 2)
199 m->bmi[ib + 1].as_mode = b_mode;
200 }
201 }
202
203 mbmi->mode = m->bmi[3].as_mode;
204 }
205
206 mbmi->uv_mode = read_intra_mode(r, vp9_kf_uv_mode_prob[mbmi->mode]);
207 }
208
209 static int read_mv_component(vp9_reader *r,
210 const nmv_component *mvcomp, int usehp) {
211 int mag, d, fr, hp;
212 const int sign = vp9_read(r, mvcomp->sign);
213 const int mv_class = treed_read(r, vp9_mv_class_tree, mvcomp->classes);
214 const int class0 = mv_class == MV_CLASS_0;
215
216 // Integer part
217 if (class0) {
218 d = treed_read(r, vp9_mv_class0_tree, mvcomp->class0);
219 } else {
220 int i;
221 const int n = mv_class + CLASS0_BITS - 1; // number of bits
222
223 d = 0;
224 for (i = 0; i < n; ++i)
225 d |= vp9_read(r, mvcomp->bits[i]) << i;
226 }
227
228 // Fractional part
229 fr = treed_read(r, vp9_mv_fp_tree,
230 class0 ? mvcomp->class0_fp[d] : mvcomp->fp);
231
232
233 // High precision part (if hp is not used, the default value of the hp is 1)
234 hp = usehp ? vp9_read(r, class0 ? mvcomp->class0_hp : mvcomp->hp)
235 : 1;
236
237 // Result
238 mag = vp9_get_mv_mag(mv_class, (d << 3) | (fr << 1) | hp) + 1;
239 return sign ? -mag : mag;
240 }
241
242 static INLINE void read_mv(vp9_reader *r, MV *mv, const MV *ref,
243 const nmv_context *ctx,
244 nmv_context_counts *counts, int allow_hp) {
245 const MV_JOINT_TYPE j = treed_read(r, vp9_mv_joint_tree, ctx->joints);
246 const int use_hp = allow_hp && vp9_use_mv_hp(ref);
247 MV diff = {0, 0};
248
249 if (mv_joint_vertical(j))
250 diff.row = read_mv_component(r, &ctx->comps[0], use_hp);
251
252 if (mv_joint_horizontal(j))
253 diff.col = read_mv_component(r, &ctx->comps[1], use_hp);
254
255 vp9_inc_mv(&diff, counts);
256
257 mv->row = ref->row + diff.row;
258 mv->col = ref->col + diff.col;
259 }
260
261 static COMPPREDMODE_TYPE read_reference_mode(VP9_COMMON *cm,
262 const MACROBLOCKD *xd,
263 vp9_reader *r) {
264 const int ctx = vp9_get_pred_context_comp_inter_inter(cm, xd);
265 const int mode = vp9_read(r, cm->fc.comp_inter_prob[ctx]);
266 if (!cm->frame_parallel_decoding_mode)
267 ++cm->counts.comp_inter[ctx][mode];
268 return mode; // SINGLE_PREDICTION_ONLY or COMP_PREDICTION_ONLY
269 }
270
271 // Read the referncence frame
272 static void read_ref_frames(VP9_COMMON *const cm, MACROBLOCKD *const xd,
273 vp9_reader *r,
274 int segment_id, MV_REFERENCE_FRAME ref_frame[2]) {
275 FRAME_CONTEXT *const fc = &cm->fc;
276 FRAME_COUNTS *const counts = &cm->counts;
277
278 if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
279 ref_frame[0] = vp9_get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME);
280 ref_frame[1] = NONE;
281 } else {
282 const COMPPREDMODE_TYPE mode = (cm->comp_pred_mode == HYBRID_PREDICTION)
283 ? read_reference_mode(cm, xd, r)
284 : cm->comp_pred_mode;
285
286 // FIXME(rbultje) I'm pretty sure this breaks segmentation ref frame coding
287 if (mode == COMP_PREDICTION_ONLY) {
288 const int idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
289 const int ctx = vp9_get_pred_context_comp_ref_p(cm, xd);
290 const int bit = vp9_read(r, fc->comp_ref_prob[ctx]);
291 if (!cm->frame_parallel_decoding_mode)
292 ++counts->comp_ref[ctx][bit];
293 ref_frame[idx] = cm->comp_fixed_ref;
294 ref_frame[!idx] = cm->comp_var_ref[bit];
295 } else if (mode == SINGLE_PREDICTION_ONLY) {
296 const int ctx0 = vp9_get_pred_context_single_ref_p1(xd);
297 const int bit0 = vp9_read(r, fc->single_ref_prob[ctx0][0]);
298 if (!cm->frame_parallel_decoding_mode)
299 ++counts->single_ref[ctx0][0][bit0];
300 if (bit0) {
301 const int ctx1 = vp9_get_pred_context_single_ref_p2(xd);
302 const int bit1 = vp9_read(r, fc->single_ref_prob[ctx1][1]);
303 if (!cm->frame_parallel_decoding_mode)
304 ++counts->single_ref[ctx1][1][bit1];
305 ref_frame[0] = bit1 ? ALTREF_FRAME : GOLDEN_FRAME;
306 } else {
307 ref_frame[0] = LAST_FRAME;
308 }
309
310 ref_frame[1] = NONE;
311 } else {
312 assert(!"Invalid prediction mode.");
313 }
314 }
315 }
316
317
318 static INLINE INTERPOLATION_TYPE read_switchable_filter_type(
319 VP9_COMMON *const cm, MACROBLOCKD *const xd, vp9_reader *r) {
320 const int ctx = vp9_get_pred_context_switchable_interp(xd);
321 const int type = treed_read(r, vp9_switchable_interp_tree,
322 cm->fc.switchable_interp_prob[ctx]);
323 if (!cm->frame_parallel_decoding_mode)
324 ++cm->counts.switchable_interp[ctx][type];
325 return type;
326 }
327
328 static void read_intra_block_mode_info(VP9_COMMON *const cm, MODE_INFO *mi,
329 vp9_reader *r) {
330 MB_MODE_INFO *const mbmi = &mi->mbmi;
331 const BLOCK_SIZE bsize = mi->mbmi.sb_type;
332
333 mbmi->ref_frame[0] = INTRA_FRAME;
334 mbmi->ref_frame[1] = NONE;
335
336 if (bsize >= BLOCK_8X8) {
337 mbmi->mode = read_intra_mode_y(cm, r, size_group_lookup[bsize]);
338 } else {
339 // Only 4x4, 4x8, 8x4 blocks
340 const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
341 const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
342 int idx, idy;
343
344 for (idy = 0; idy < 2; idy += num_4x4_h) {
345 for (idx = 0; idx < 2; idx += num_4x4_w) {
346 const int ib = idy * 2 + idx;
347 const int b_mode = read_intra_mode_y(cm, r, 0);
348 mi->bmi[ib].as_mode = b_mode;
349 if (num_4x4_h == 2)
350 mi->bmi[ib + 2].as_mode = b_mode;
351 if (num_4x4_w == 2)
352 mi->bmi[ib + 1].as_mode = b_mode;
353 }
354 }
355 mbmi->mode = mi->bmi[3].as_mode;
356 }
357
358 mbmi->uv_mode = read_intra_mode_uv(cm, r, mbmi->mode);
359 }
360
361 static INLINE int assign_mv(VP9_COMMON *cm, MB_PREDICTION_MODE mode,
362 int_mv mv[2], int_mv best_mv[2],
363 int_mv nearest_mv[2], int_mv near_mv[2],
364 int is_compound, int allow_hp, vp9_reader *r) {
365 int i;
366 int ret = 1;
367
368 switch (mode) {
369 case NEWMV: {
370 nmv_context_counts *const mv_counts = cm->frame_parallel_decoding_mode ?
371 NULL : &cm->counts.mv;
372 read_mv(r, &mv[0].as_mv, &best_mv[0].as_mv,
373 &cm->fc.nmvc, mv_counts, allow_hp);
374 if (is_compound)
375 read_mv(r, &mv[1].as_mv, &best_mv[1].as_mv,
376 &cm->fc.nmvc, mv_counts, allow_hp);
377 for (i = 0; i < 1 + is_compound; ++i) {
378 ret = ret && mv[i].as_mv.row < MV_UPP && mv[i].as_mv.row > MV_LOW;
379 ret = ret && mv[i].as_mv.col < MV_UPP && mv[i].as_mv.col > MV_LOW;
380 }
381 break;
382 }
383 case NEARESTMV: {
384 mv[0].as_int = nearest_mv[0].as_int;
385 if (is_compound) mv[1].as_int = nearest_mv[1].as_int;
386 break;
387 }
388 case NEARMV: {
389 mv[0].as_int = near_mv[0].as_int;
390 if (is_compound) mv[1].as_int = near_mv[1].as_int;
391 break;
392 }
393 case ZEROMV: {
394 mv[0].as_int = 0;
395 if (is_compound) mv[1].as_int = 0;
396 break;
397 }
398 default: {
399 return 0;
400 }
401 }
402 return ret;
403 }
404
405 static int read_is_inter_block(VP9_COMMON *const cm, MACROBLOCKD *const xd,
406 int segment_id, vp9_reader *r) {
407 if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
408 return vp9_get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME) !=
409 INTRA_FRAME;
410 } else {
411 const int ctx = vp9_get_pred_context_intra_inter(xd);
412 const int is_inter = vp9_read(r, vp9_get_pred_prob_intra_inter(cm, xd));
413 if (!cm->frame_parallel_decoding_mode)
414 ++cm->counts.intra_inter[ctx][is_inter];
415 return is_inter;
416 }
417 }
418
419 static void read_inter_block_mode_info(VP9_COMMON *const cm,
420 MACROBLOCKD *const xd,
421 const TileInfo *const tile,
422 MODE_INFO *const mi,
423 int mi_row, int mi_col, vp9_reader *r) {
424 MB_MODE_INFO *const mbmi = &mi->mbmi;
425 const BLOCK_SIZE bsize = mbmi->sb_type;
426 const int allow_hp = cm->allow_high_precision_mv;
427
428 int_mv nearest[2], nearmv[2], best[2];
429 uint8_t inter_mode_ctx;
430 MV_REFERENCE_FRAME ref0;
431 int is_compound;
432
433 mbmi->uv_mode = DC_PRED;
434 read_ref_frames(cm, xd, r, mbmi->segment_id, mbmi->ref_frame);
435 ref0 = mbmi->ref_frame[0];
436 is_compound = has_second_ref(mbmi);
437
438 vp9_find_mv_refs(cm, xd, tile, mi, xd->last_mi, ref0, mbmi->ref_mvs[ref0],
439 mi_row, mi_col);
440
441 inter_mode_ctx = mbmi->mode_context[ref0];
442
443 if (vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
444 mbmi->mode = ZEROMV;
445 if (bsize < BLOCK_8X8) {
446 vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
447 "Invalid usage of segement feature on small blocks");
448 return;
449 }
450 } else {
451 if (bsize >= BLOCK_8X8)
452 mbmi->mode = read_inter_mode(cm, r, inter_mode_ctx);
453 }
454
455 // nearest, nearby
456 if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
457 vp9_find_best_ref_mvs(xd, allow_hp,
458 mbmi->ref_mvs[ref0], &nearest[0], &nearmv[0]);
459 best[0].as_int = nearest[0].as_int;
460 }
461
462 if (is_compound) {
463 const MV_REFERENCE_FRAME ref1 = mbmi->ref_frame[1];
464 vp9_find_mv_refs(cm, xd, tile, mi, xd->last_mi,
465 ref1, mbmi->ref_mvs[ref1], mi_row, mi_col);
466
467 if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
468 vp9_find_best_ref_mvs(xd, allow_hp,
469 mbmi->ref_mvs[ref1], &nearest[1], &nearmv[1]);
470 best[1].as_int = nearest[1].as_int;
471 }
472 }
473
474 mbmi->interp_filter = (cm->mcomp_filter_type == SWITCHABLE)
475 ? read_switchable_filter_type(cm, xd, r)
476 : cm->mcomp_filter_type;
477
478 if (bsize < BLOCK_8X8) {
479 const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
480 const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
481 int idx, idy;
482 int b_mode;
483 for (idy = 0; idy < 2; idy += num_4x4_h) {
484 for (idx = 0; idx < 2; idx += num_4x4_w) {
485 int_mv block[2];
486 const int j = idy * 2 + idx;
487 b_mode = read_inter_mode(cm, r, inter_mode_ctx);
488
489 if (b_mode == NEARESTMV || b_mode == NEARMV) {
490 vp9_append_sub8x8_mvs_for_idx(cm, xd, tile, &nearest[0],
491 &nearmv[0], j, 0,
492 mi_row, mi_col);
493
494 if (is_compound)
495 vp9_append_sub8x8_mvs_for_idx(cm, xd, tile, &nearest[1],
496 &nearmv[1], j, 1,
497 mi_row, mi_col);
498 }
499
500 if (!assign_mv(cm, b_mode, block, best, nearest, nearmv,
501 is_compound, allow_hp, r)) {
502 xd->corrupted |= 1;
503 break;
504 };
505
506
507 mi->bmi[j].as_mv[0].as_int = block[0].as_int;
508 if (is_compound)
509 mi->bmi[j].as_mv[1].as_int = block[1].as_int;
510
511 if (num_4x4_h == 2)
512 mi->bmi[j + 2] = mi->bmi[j];
513 if (num_4x4_w == 2)
514 mi->bmi[j + 1] = mi->bmi[j];
515 }
516 }
517
518 mi->mbmi.mode = b_mode;
519
520 mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
521 mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
522 } else {
523 xd->corrupted |= !assign_mv(cm, mbmi->mode, mbmi->mv,
524 best, nearest, nearmv,
525 is_compound, allow_hp, r);
526 }
527 }
528
529 static void read_inter_frame_mode_info(VP9_COMMON *const cm,
530 MACROBLOCKD *const xd,
531 const TileInfo *const tile,
532 MODE_INFO *const mi,
533 int mi_row, int mi_col, vp9_reader *r) {
534 MB_MODE_INFO *const mbmi = &mi->mbmi;
535 int inter_block;
536
537 mbmi->mv[0].as_int = 0;
538 mbmi->mv[1].as_int = 0;
539 mbmi->segment_id = read_inter_segment_id(cm, xd, mi_row, mi_col, r);
540 mbmi->skip_coeff = read_skip_coeff(cm, xd, mbmi->segment_id, r);
541 inter_block = read_is_inter_block(cm, xd, mbmi->segment_id, r);
542 mbmi->tx_size = read_tx_size(cm, xd, cm->tx_mode, mbmi->sb_type,
543 !mbmi->skip_coeff || !inter_block, r);
544
545 if (inter_block)
546 read_inter_block_mode_info(cm, xd, tile, mi, mi_row, mi_col, r);
547 else
548 read_intra_block_mode_info(cm, mi, r);
549 }
550
551 void vp9_read_mode_info(VP9_COMMON *cm, MACROBLOCKD *xd,
552 const TileInfo *const tile,
553 int mi_row, int mi_col, vp9_reader *r) {
554 MODE_INFO *const mi = xd->mi_8x8[0];
555 const BLOCK_SIZE bsize = mi->mbmi.sb_type;
556 const int bw = num_8x8_blocks_wide_lookup[bsize];
557 const int bh = num_8x8_blocks_high_lookup[bsize];
558 const int y_mis = MIN(bh, cm->mi_rows - mi_row);
559 const int x_mis = MIN(bw, cm->mi_cols - mi_col);
560 int x, y, z;
561
562 if (frame_is_intra_only(cm))
563 read_intra_frame_mode_info(cm, xd, mi, mi_row, mi_col, r);
564 else
565 read_inter_frame_mode_info(cm, xd, tile, mi, mi_row, mi_col, r);
566
567 for (y = 0, z = 0; y < y_mis; y++, z += cm->mode_info_stride) {
568 for (x = !y; x < x_mis; x++) {
569 xd->mi_8x8[z + x] = mi;
570 }
571 }
572 }

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