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
12 #include <limits.h>
13 #include <string.h>
14
15 #include "vpx_config.h"
16 #include "vp8_rtcd.h"
17 #include "vpx/vpx_integer.h"
18 #include "blockd.h"
19 #include "reconinter.h"
20 #if CONFIG_RUNTIME_CPU_DETECT
21 #include "onyxc_int.h"
22 #endif
23
vp8_copy_mem16x16_c(unsigned char * src,int src_stride,unsigned char * dst,int dst_stride)24 void vp8_copy_mem16x16_c(
25 unsigned char *src,
26 int src_stride,
27 unsigned char *dst,
28 int dst_stride)
29 {
30
31 int r;
32
33 for (r = 0; r < 16; r++)
34 {
35 memcpy(dst, src, 16);
36
37 src += src_stride;
38 dst += dst_stride;
39
40 }
41
42 }
43
vp8_copy_mem8x8_c(unsigned char * src,int src_stride,unsigned char * dst,int dst_stride)44 void vp8_copy_mem8x8_c(
45 unsigned char *src,
46 int src_stride,
47 unsigned char *dst,
48 int dst_stride)
49 {
50 int r;
51
52 for (r = 0; r < 8; r++)
53 {
54 memcpy(dst, src, 8);
55
56 src += src_stride;
57 dst += dst_stride;
58
59 }
60
61 }
62
vp8_copy_mem8x4_c(unsigned char * src,int src_stride,unsigned char * dst,int dst_stride)63 void vp8_copy_mem8x4_c(
64 unsigned char *src,
65 int src_stride,
66 unsigned char *dst,
67 int dst_stride)
68 {
69 int r;
70
71 for (r = 0; r < 4; r++)
72 {
73 memcpy(dst, src, 8);
74
75 src += src_stride;
76 dst += dst_stride;
77
78 }
79
80 }
81
82
vp8_build_inter_predictors_b(BLOCKD * d,int pitch,unsigned char * base_pre,int pre_stride,vp8_subpix_fn_t sppf)83 void vp8_build_inter_predictors_b(BLOCKD *d, int pitch, unsigned char *base_pre, int pre_stride, vp8_subpix_fn_t sppf)
84 {
85 int r;
86 unsigned char *pred_ptr = d->predictor;
87 unsigned char *ptr;
88 ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
89
90 if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
91 {
92 sppf(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, pred_ptr, pitch);
93 }
94 else
95 {
96 for (r = 0; r < 4; r++)
97 {
98 pred_ptr[0] = ptr[0];
99 pred_ptr[1] = ptr[1];
100 pred_ptr[2] = ptr[2];
101 pred_ptr[3] = ptr[3];
102 pred_ptr += pitch;
103 ptr += pre_stride;
104 }
105 }
106 }
107
build_inter_predictors4b(MACROBLOCKD * x,BLOCKD * d,unsigned char * dst,int dst_stride,unsigned char * base_pre,int pre_stride)108 static void build_inter_predictors4b(MACROBLOCKD *x, BLOCKD *d, unsigned char *dst, int dst_stride, unsigned char *base_pre, int pre_stride)
109 {
110 unsigned char *ptr;
111 ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
112
113 if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
114 {
115 x->subpixel_predict8x8(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, dst, dst_stride);
116 }
117 else
118 {
119 vp8_copy_mem8x8(ptr, pre_stride, dst, dst_stride);
120 }
121 }
122
build_inter_predictors2b(MACROBLOCKD * x,BLOCKD * d,unsigned char * dst,int dst_stride,unsigned char * base_pre,int pre_stride)123 static void build_inter_predictors2b(MACROBLOCKD *x, BLOCKD *d, unsigned char *dst, int dst_stride, unsigned char *base_pre, int pre_stride)
124 {
125 unsigned char *ptr;
126 ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
127
128 if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
129 {
130 x->subpixel_predict8x4(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, dst, dst_stride);
131 }
132 else
133 {
134 vp8_copy_mem8x4(ptr, pre_stride, dst, dst_stride);
135 }
136 }
137
build_inter_predictors_b(BLOCKD * d,unsigned char * dst,int dst_stride,unsigned char * base_pre,int pre_stride,vp8_subpix_fn_t sppf)138 static void build_inter_predictors_b(BLOCKD *d, unsigned char *dst, int dst_stride, unsigned char *base_pre, int pre_stride, vp8_subpix_fn_t sppf)
139 {
140 int r;
141 unsigned char *ptr;
142 ptr = base_pre + d->offset + (d->bmi.mv.as_mv.row >> 3) * pre_stride + (d->bmi.mv.as_mv.col >> 3);
143
144 if (d->bmi.mv.as_mv.row & 7 || d->bmi.mv.as_mv.col & 7)
145 {
146 sppf(ptr, pre_stride, d->bmi.mv.as_mv.col & 7, d->bmi.mv.as_mv.row & 7, dst, dst_stride);
147 }
148 else
149 {
150 for (r = 0; r < 4; r++)
151 {
152 dst[0] = ptr[0];
153 dst[1] = ptr[1];
154 dst[2] = ptr[2];
155 dst[3] = ptr[3];
156 dst += dst_stride;
157 ptr += pre_stride;
158 }
159 }
160 }
161
162
163 /*encoder only*/
vp8_build_inter16x16_predictors_mbuv(MACROBLOCKD * x)164 void vp8_build_inter16x16_predictors_mbuv(MACROBLOCKD *x)
165 {
166 unsigned char *uptr, *vptr;
167 unsigned char *upred_ptr = &x->predictor[256];
168 unsigned char *vpred_ptr = &x->predictor[320];
169
170 int mv_row = x->mode_info_context->mbmi.mv.as_mv.row;
171 int mv_col = x->mode_info_context->mbmi.mv.as_mv.col;
172 int offset;
173 int pre_stride = x->pre.uv_stride;
174
175 /* calc uv motion vectors */
176 mv_row += 1 | (mv_row >> (sizeof(int) * CHAR_BIT - 1));
177 mv_col += 1 | (mv_col >> (sizeof(int) * CHAR_BIT - 1));
178 mv_row /= 2;
179 mv_col /= 2;
180 mv_row &= x->fullpixel_mask;
181 mv_col &= x->fullpixel_mask;
182
183 offset = (mv_row >> 3) * pre_stride + (mv_col >> 3);
184 uptr = x->pre.u_buffer + offset;
185 vptr = x->pre.v_buffer + offset;
186
187 if ((mv_row | mv_col) & 7)
188 {
189 x->subpixel_predict8x8(uptr, pre_stride, mv_col & 7, mv_row & 7, upred_ptr, 8);
190 x->subpixel_predict8x8(vptr, pre_stride, mv_col & 7, mv_row & 7, vpred_ptr, 8);
191 }
192 else
193 {
194 vp8_copy_mem8x8(uptr, pre_stride, upred_ptr, 8);
195 vp8_copy_mem8x8(vptr, pre_stride, vpred_ptr, 8);
196 }
197 }
198
199 /*encoder only*/
vp8_build_inter4x4_predictors_mbuv(MACROBLOCKD * x)200 void vp8_build_inter4x4_predictors_mbuv(MACROBLOCKD *x)
201 {
202 int i, j;
203 int pre_stride = x->pre.uv_stride;
204 unsigned char *base_pre;
205
206 /* build uv mvs */
207 for (i = 0; i < 2; i++)
208 {
209 for (j = 0; j < 2; j++)
210 {
211 int yoffset = i * 8 + j * 2;
212 int uoffset = 16 + i * 2 + j;
213 int voffset = 20 + i * 2 + j;
214
215 int temp;
216
217 temp = x->block[yoffset ].bmi.mv.as_mv.row
218 + x->block[yoffset+1].bmi.mv.as_mv.row
219 + x->block[yoffset+4].bmi.mv.as_mv.row
220 + x->block[yoffset+5].bmi.mv.as_mv.row;
221
222 temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
223
224 x->block[uoffset].bmi.mv.as_mv.row = (temp / 8) & x->fullpixel_mask;
225
226 temp = x->block[yoffset ].bmi.mv.as_mv.col
227 + x->block[yoffset+1].bmi.mv.as_mv.col
228 + x->block[yoffset+4].bmi.mv.as_mv.col
229 + x->block[yoffset+5].bmi.mv.as_mv.col;
230
231 temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
232
233 x->block[uoffset].bmi.mv.as_mv.col = (temp / 8) & x->fullpixel_mask;
234
235 x->block[voffset].bmi.mv.as_int = x->block[uoffset].bmi.mv.as_int;
236 }
237 }
238
239 base_pre = x->pre.u_buffer;
240 for (i = 16; i < 20; i += 2)
241 {
242 BLOCKD *d0 = &x->block[i];
243 BLOCKD *d1 = &x->block[i+1];
244
245 if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
246 build_inter_predictors2b(x, d0, d0->predictor, 8, base_pre, pre_stride);
247 else
248 {
249 vp8_build_inter_predictors_b(d0, 8, base_pre, pre_stride, x->subpixel_predict);
250 vp8_build_inter_predictors_b(d1, 8, base_pre, pre_stride, x->subpixel_predict);
251 }
252 }
253
254 base_pre = x->pre.v_buffer;
255 for (i = 20; i < 24; i += 2)
256 {
257 BLOCKD *d0 = &x->block[i];
258 BLOCKD *d1 = &x->block[i+1];
259
260 if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
261 build_inter_predictors2b(x, d0, d0->predictor, 8, base_pre, pre_stride);
262 else
263 {
264 vp8_build_inter_predictors_b(d0, 8, base_pre, pre_stride, x->subpixel_predict);
265 vp8_build_inter_predictors_b(d1, 8, base_pre, pre_stride, x->subpixel_predict);
266 }
267 }
268 }
269
270
271 /*encoder only*/
vp8_build_inter16x16_predictors_mby(MACROBLOCKD * x,unsigned char * dst_y,int dst_ystride)272 void vp8_build_inter16x16_predictors_mby(MACROBLOCKD *x,
273 unsigned char *dst_y,
274 int dst_ystride)
275 {
276 unsigned char *ptr_base;
277 unsigned char *ptr;
278 int mv_row = x->mode_info_context->mbmi.mv.as_mv.row;
279 int mv_col = x->mode_info_context->mbmi.mv.as_mv.col;
280 int pre_stride = x->pre.y_stride;
281
282 ptr_base = x->pre.y_buffer;
283 ptr = ptr_base + (mv_row >> 3) * pre_stride + (mv_col >> 3);
284
285 if ((mv_row | mv_col) & 7)
286 {
287 x->subpixel_predict16x16(ptr, pre_stride, mv_col & 7, mv_row & 7,
288 dst_y, dst_ystride);
289 }
290 else
291 {
292 vp8_copy_mem16x16(ptr, pre_stride, dst_y,
293 dst_ystride);
294 }
295 }
296
clamp_mv_to_umv_border(MV * mv,const MACROBLOCKD * xd)297 static void clamp_mv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
298 {
299 /* If the MV points so far into the UMV border that no visible pixels
300 * are used for reconstruction, the subpel part of the MV can be
301 * discarded and the MV limited to 16 pixels with equivalent results.
302 *
303 * This limit kicks in at 19 pixels for the top and left edges, for
304 * the 16 pixels plus 3 taps right of the central pixel when subpel
305 * filtering. The bottom and right edges use 16 pixels plus 2 pixels
306 * left of the central pixel when filtering.
307 */
308 if (mv->col < (xd->mb_to_left_edge - (19 << 3)))
309 mv->col = xd->mb_to_left_edge - (16 << 3);
310 else if (mv->col > xd->mb_to_right_edge + (18 << 3))
311 mv->col = xd->mb_to_right_edge + (16 << 3);
312
313 if (mv->row < (xd->mb_to_top_edge - (19 << 3)))
314 mv->row = xd->mb_to_top_edge - (16 << 3);
315 else if (mv->row > xd->mb_to_bottom_edge + (18 << 3))
316 mv->row = xd->mb_to_bottom_edge + (16 << 3);
317 }
318
319 /* A version of the above function for chroma block MVs.*/
clamp_uvmv_to_umv_border(MV * mv,const MACROBLOCKD * xd)320 static void clamp_uvmv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
321 {
322 mv->col = (2*mv->col < (xd->mb_to_left_edge - (19 << 3))) ?
323 (xd->mb_to_left_edge - (16 << 3)) >> 1 : mv->col;
324 mv->col = (2*mv->col > xd->mb_to_right_edge + (18 << 3)) ?
325 (xd->mb_to_right_edge + (16 << 3)) >> 1 : mv->col;
326
327 mv->row = (2*mv->row < (xd->mb_to_top_edge - (19 << 3))) ?
328 (xd->mb_to_top_edge - (16 << 3)) >> 1 : mv->row;
329 mv->row = (2*mv->row > xd->mb_to_bottom_edge + (18 << 3)) ?
330 (xd->mb_to_bottom_edge + (16 << 3)) >> 1 : mv->row;
331 }
332
vp8_build_inter16x16_predictors_mb(MACROBLOCKD * x,unsigned char * dst_y,unsigned char * dst_u,unsigned char * dst_v,int dst_ystride,int dst_uvstride)333 void vp8_build_inter16x16_predictors_mb(MACROBLOCKD *x,
334 unsigned char *dst_y,
335 unsigned char *dst_u,
336 unsigned char *dst_v,
337 int dst_ystride,
338 int dst_uvstride)
339 {
340 int offset;
341 unsigned char *ptr;
342 unsigned char *uptr, *vptr;
343
344 int_mv _16x16mv;
345
346 unsigned char *ptr_base = x->pre.y_buffer;
347 int pre_stride = x->pre.y_stride;
348
349 _16x16mv.as_int = x->mode_info_context->mbmi.mv.as_int;
350
351 if (x->mode_info_context->mbmi.need_to_clamp_mvs)
352 {
353 clamp_mv_to_umv_border(&_16x16mv.as_mv, x);
354 }
355
356 ptr = ptr_base + ( _16x16mv.as_mv.row >> 3) * pre_stride + (_16x16mv.as_mv.col >> 3);
357
358 if ( _16x16mv.as_int & 0x00070007)
359 {
360 x->subpixel_predict16x16(ptr, pre_stride, _16x16mv.as_mv.col & 7, _16x16mv.as_mv.row & 7, dst_y, dst_ystride);
361 }
362 else
363 {
364 vp8_copy_mem16x16(ptr, pre_stride, dst_y, dst_ystride);
365 }
366
367 /* calc uv motion vectors */
368 _16x16mv.as_mv.row += 1 | (_16x16mv.as_mv.row >> (sizeof(int) * CHAR_BIT - 1));
369 _16x16mv.as_mv.col += 1 | (_16x16mv.as_mv.col >> (sizeof(int) * CHAR_BIT - 1));
370 _16x16mv.as_mv.row /= 2;
371 _16x16mv.as_mv.col /= 2;
372 _16x16mv.as_mv.row &= x->fullpixel_mask;
373 _16x16mv.as_mv.col &= x->fullpixel_mask;
374
375 pre_stride >>= 1;
376 offset = ( _16x16mv.as_mv.row >> 3) * pre_stride + (_16x16mv.as_mv.col >> 3);
377 uptr = x->pre.u_buffer + offset;
378 vptr = x->pre.v_buffer + offset;
379
380 if ( _16x16mv.as_int & 0x00070007)
381 {
382 x->subpixel_predict8x8(uptr, pre_stride, _16x16mv.as_mv.col & 7, _16x16mv.as_mv.row & 7, dst_u, dst_uvstride);
383 x->subpixel_predict8x8(vptr, pre_stride, _16x16mv.as_mv.col & 7, _16x16mv.as_mv.row & 7, dst_v, dst_uvstride);
384 }
385 else
386 {
387 vp8_copy_mem8x8(uptr, pre_stride, dst_u, dst_uvstride);
388 vp8_copy_mem8x8(vptr, pre_stride, dst_v, dst_uvstride);
389 }
390 }
391
build_inter4x4_predictors_mb(MACROBLOCKD * x)392 static void build_inter4x4_predictors_mb(MACROBLOCKD *x)
393 {
394 int i;
395 unsigned char *base_dst = x->dst.y_buffer;
396 unsigned char *base_pre = x->pre.y_buffer;
397
398 if (x->mode_info_context->mbmi.partitioning < 3)
399 {
400 BLOCKD *b;
401 int dst_stride = x->dst.y_stride;
402
403 x->block[ 0].bmi = x->mode_info_context->bmi[ 0];
404 x->block[ 2].bmi = x->mode_info_context->bmi[ 2];
405 x->block[ 8].bmi = x->mode_info_context->bmi[ 8];
406 x->block[10].bmi = x->mode_info_context->bmi[10];
407 if (x->mode_info_context->mbmi.need_to_clamp_mvs)
408 {
409 clamp_mv_to_umv_border(&x->block[ 0].bmi.mv.as_mv, x);
410 clamp_mv_to_umv_border(&x->block[ 2].bmi.mv.as_mv, x);
411 clamp_mv_to_umv_border(&x->block[ 8].bmi.mv.as_mv, x);
412 clamp_mv_to_umv_border(&x->block[10].bmi.mv.as_mv, x);
413 }
414
415 b = &x->block[ 0];
416 build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
417 b = &x->block[ 2];
418 build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
419 b = &x->block[ 8];
420 build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
421 b = &x->block[10];
422 build_inter_predictors4b(x, b, base_dst + b->offset, dst_stride, base_pre, dst_stride);
423 }
424 else
425 {
426 for (i = 0; i < 16; i += 2)
427 {
428 BLOCKD *d0 = &x->block[i];
429 BLOCKD *d1 = &x->block[i+1];
430 int dst_stride = x->dst.y_stride;
431
432 x->block[i+0].bmi = x->mode_info_context->bmi[i+0];
433 x->block[i+1].bmi = x->mode_info_context->bmi[i+1];
434 if (x->mode_info_context->mbmi.need_to_clamp_mvs)
435 {
436 clamp_mv_to_umv_border(&x->block[i+0].bmi.mv.as_mv, x);
437 clamp_mv_to_umv_border(&x->block[i+1].bmi.mv.as_mv, x);
438 }
439
440 if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
441 build_inter_predictors2b(x, d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride);
442 else
443 {
444 build_inter_predictors_b(d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
445 build_inter_predictors_b(d1, base_dst + d1->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
446 }
447
448 }
449
450 }
451 base_dst = x->dst.u_buffer;
452 base_pre = x->pre.u_buffer;
453 for (i = 16; i < 20; i += 2)
454 {
455 BLOCKD *d0 = &x->block[i];
456 BLOCKD *d1 = &x->block[i+1];
457 int dst_stride = x->dst.uv_stride;
458
459 /* Note: uv mvs already clamped in build_4x4uvmvs() */
460
461 if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
462 build_inter_predictors2b(x, d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride);
463 else
464 {
465 build_inter_predictors_b(d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
466 build_inter_predictors_b(d1, base_dst + d1->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
467 }
468 }
469
470 base_dst = x->dst.v_buffer;
471 base_pre = x->pre.v_buffer;
472 for (i = 20; i < 24; i += 2)
473 {
474 BLOCKD *d0 = &x->block[i];
475 BLOCKD *d1 = &x->block[i+1];
476 int dst_stride = x->dst.uv_stride;
477
478 /* Note: uv mvs already clamped in build_4x4uvmvs() */
479
480 if (d0->bmi.mv.as_int == d1->bmi.mv.as_int)
481 build_inter_predictors2b(x, d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride);
482 else
483 {
484 build_inter_predictors_b(d0, base_dst + d0->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
485 build_inter_predictors_b(d1, base_dst + d1->offset, dst_stride, base_pre, dst_stride, x->subpixel_predict);
486 }
487 }
488 }
489
490 static
build_4x4uvmvs(MACROBLOCKD * x)491 void build_4x4uvmvs(MACROBLOCKD *x)
492 {
493 int i, j;
494
495 for (i = 0; i < 2; i++)
496 {
497 for (j = 0; j < 2; j++)
498 {
499 int yoffset = i * 8 + j * 2;
500 int uoffset = 16 + i * 2 + j;
501 int voffset = 20 + i * 2 + j;
502
503 int temp;
504
505 temp = x->mode_info_context->bmi[yoffset + 0].mv.as_mv.row
506 + x->mode_info_context->bmi[yoffset + 1].mv.as_mv.row
507 + x->mode_info_context->bmi[yoffset + 4].mv.as_mv.row
508 + x->mode_info_context->bmi[yoffset + 5].mv.as_mv.row;
509
510 temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
511
512 x->block[uoffset].bmi.mv.as_mv.row = (temp / 8) & x->fullpixel_mask;
513
514 temp = x->mode_info_context->bmi[yoffset + 0].mv.as_mv.col
515 + x->mode_info_context->bmi[yoffset + 1].mv.as_mv.col
516 + x->mode_info_context->bmi[yoffset + 4].mv.as_mv.col
517 + x->mode_info_context->bmi[yoffset + 5].mv.as_mv.col;
518
519 temp += 4 + ((temp >> (sizeof(temp) * CHAR_BIT - 1)) * 8);
520
521 x->block[uoffset].bmi.mv.as_mv.col = (temp / 8) & x->fullpixel_mask;
522
523 if (x->mode_info_context->mbmi.need_to_clamp_mvs)
524 clamp_uvmv_to_umv_border(&x->block[uoffset].bmi.mv.as_mv, x);
525
526 x->block[voffset].bmi.mv.as_int = x->block[uoffset].bmi.mv.as_int;
527 }
528 }
529 }
530
vp8_build_inter_predictors_mb(MACROBLOCKD * xd)531 void vp8_build_inter_predictors_mb(MACROBLOCKD *xd)
532 {
533 if (xd->mode_info_context->mbmi.mode != SPLITMV)
534 {
535 vp8_build_inter16x16_predictors_mb(xd, xd->dst.y_buffer,
536 xd->dst.u_buffer, xd->dst.v_buffer,
537 xd->dst.y_stride, xd->dst.uv_stride);
538 }
539 else
540 {
541 build_4x4uvmvs(xd);
542 build_inter4x4_predictors_mb(xd);
543 }
544 }
545