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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / vc1_pred.c
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f6fa7814
DM		 1/*
2 * VC-1 and WMV3 decoder
3 * Copyright (c) 2011 Mashiat Sarker Shakkhar
4 * Copyright (c) 2006-2007 Konstantin Shishkov
5 * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24/**
25 * @file
26 * VC-1 and WMV3 block decoding routines
27 */
28
29#include "mathops.h"
30#include "mpegutils.h"
31#include "mpegvideo.h"
32#include "vc1.h"
33#include "vc1_pred.h"
34#include "vc1data.h"
35
36static av_always_inline int scaleforsame_x(VC1Context *v, int n /* MV */, int dir)
37{
38 int scaledvalue, refdist;
39 int scalesame1, scalesame2;
40 int scalezone1_x, zone1offset_x;
41 int table_index = dir ^ v->second_field;
42
43 if (v->s.pict_type != AV_PICTURE_TYPE_B)
44 refdist = v->refdist;
45 else
46 refdist = dir ? v->brfd : v->frfd;
47 if (refdist > 3)
48 refdist = 3;
49 scalesame1 = ff_vc1_field_mvpred_scales[table_index][1][refdist];
50 scalesame2 = ff_vc1_field_mvpred_scales[table_index][2][refdist];
51 scalezone1_x = ff_vc1_field_mvpred_scales[table_index][3][refdist];
52 zone1offset_x = ff_vc1_field_mvpred_scales[table_index][5][refdist];
53
54 if (FFABS(n) > 255)
55 scaledvalue = n;
56 else {
57 if (FFABS(n) < scalezone1_x)
58 scaledvalue = (n * scalesame1) >> 8;
59 else {
60 if (n < 0)
61 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_x;
62 else
63 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_x;
64 }
65 }
66 return av_clip(scaledvalue, -v->range_x, v->range_x - 1);
67}
68
69static av_always_inline int scaleforsame_y(VC1Context *v, int i, int n /* MV */, int dir)
70{
71 int scaledvalue, refdist;
72 int scalesame1, scalesame2;
73 int scalezone1_y, zone1offset_y;
74 int table_index = dir ^ v->second_field;
75
76 if (v->s.pict_type != AV_PICTURE_TYPE_B)
77 refdist = v->refdist;
78 else
79 refdist = dir ? v->brfd : v->frfd;
80 if (refdist > 3)
81 refdist = 3;
82 scalesame1 = ff_vc1_field_mvpred_scales[table_index][1][refdist];
83 scalesame2 = ff_vc1_field_mvpred_scales[table_index][2][refdist];
84 scalezone1_y = ff_vc1_field_mvpred_scales[table_index][4][refdist];
85 zone1offset_y = ff_vc1_field_mvpred_scales[table_index][6][refdist];
86
87 if (FFABS(n) > 63)
88 scaledvalue = n;
89 else {
90 if (FFABS(n) < scalezone1_y)
91 scaledvalue = (n * scalesame1) >> 8;
92 else {
93 if (n < 0)
94 scaledvalue = ((n * scalesame2) >> 8) - zone1offset_y;
95 else
96 scaledvalue = ((n * scalesame2) >> 8) + zone1offset_y;
97 }
98 }
99
100 if (v->cur_field_type && !v->ref_field_type[dir])
101 return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);
102 else
103 return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);
104}
105
106static av_always_inline int scaleforopp_x(VC1Context *v, int n /* MV */)
107{
108 int scalezone1_x, zone1offset_x;
109 int scaleopp1, scaleopp2, brfd;
110 int scaledvalue;
111
112 brfd = FFMIN(v->brfd, 3);
113 scalezone1_x = ff_vc1_b_field_mvpred_scales[3][brfd];
114 zone1offset_x = ff_vc1_b_field_mvpred_scales[5][brfd];
115 scaleopp1 = ff_vc1_b_field_mvpred_scales[1][brfd];
116 scaleopp2 = ff_vc1_b_field_mvpred_scales[2][brfd];
117
118 if (FFABS(n) > 255)
119 scaledvalue = n;
120 else {
121 if (FFABS(n) < scalezone1_x)
122 scaledvalue = (n * scaleopp1) >> 8;
123 else {
124 if (n < 0)
125 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_x;
126 else
127 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_x;
128 }
129 }
130 return av_clip(scaledvalue, -v->range_x, v->range_x - 1);
131}
132
133static av_always_inline int scaleforopp_y(VC1Context *v, int n /* MV */, int dir)
134{
135 int scalezone1_y, zone1offset_y;
136 int scaleopp1, scaleopp2, brfd;
137 int scaledvalue;
138
139 brfd = FFMIN(v->brfd, 3);
140 scalezone1_y = ff_vc1_b_field_mvpred_scales[4][brfd];
141 zone1offset_y = ff_vc1_b_field_mvpred_scales[6][brfd];
142 scaleopp1 = ff_vc1_b_field_mvpred_scales[1][brfd];
143 scaleopp2 = ff_vc1_b_field_mvpred_scales[2][brfd];
144
145 if (FFABS(n) > 63)
146 scaledvalue = n;
147 else {
148 if (FFABS(n) < scalezone1_y)
149 scaledvalue = (n * scaleopp1) >> 8;
150 else {
151 if (n < 0)
152 scaledvalue = ((n * scaleopp2) >> 8) - zone1offset_y;
153 else
154 scaledvalue = ((n * scaleopp2) >> 8) + zone1offset_y;
155 }
156 }
157 if (v->cur_field_type && !v->ref_field_type[dir]) {
158 return av_clip(scaledvalue, -v->range_y / 2 + 1, v->range_y / 2);
159 } else {
160 return av_clip(scaledvalue, -v->range_y / 2, v->range_y / 2 - 1);
161 }
162}
163
164static av_always_inline int scaleforsame(VC1Context *v, int i, int n /* MV */,
165 int dim, int dir)
166{
167 int brfd, scalesame;
168 int hpel = 1 - v->s.quarter_sample;
169
170 n >>= hpel;
171 if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {
172 if (dim)
173 n = scaleforsame_y(v, i, n, dir) << hpel;
174 else
175 n = scaleforsame_x(v, n, dir) << hpel;
176 return n;
177 }
178 brfd = FFMIN(v->brfd, 3);
179 scalesame = ff_vc1_b_field_mvpred_scales[0][brfd];
180
181 n = (n * scalesame >> 8) << hpel;
182 return n;
183}
184
185static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */,
186 int dim, int dir)
187{
188 int refdist, scaleopp;
189 int hpel = 1 - v->s.quarter_sample;
190
191 n >>= hpel;
192 if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {
193 if (dim)
194 n = scaleforopp_y(v, n, dir) << hpel;
195 else
196 n = scaleforopp_x(v, n) << hpel;
197 return n;
198 }
199 if (v->s.pict_type != AV_PICTURE_TYPE_B)
200 refdist = FFMIN(v->refdist, 3);
201 else
202 refdist = dir ? v->brfd : v->frfd;
203 scaleopp = ff_vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];
204
205 n = (n * scaleopp >> 8) << hpel;
206 return n;
207}
208
209/** Predict and set motion vector
210 */
211void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
212 int mv1, int r_x, int r_y, uint8_t* is_intra,
213 int pred_flag, int dir)
214{
215 MpegEncContext *s = &v->s;
216 int xy, wrap, off = 0;
217 int16_t *A, *B, *C;
218 int px, py;
219 int sum;
220 int mixedmv_pic, num_samefield = 0, num_oppfield = 0;
221 int opposite, a_f, b_f, c_f;
222 int16_t field_predA[2];
223 int16_t field_predB[2];
224 int16_t field_predC[2];
225 int a_valid, b_valid, c_valid;
226 int hybridmv_thresh, y_bias = 0;
227
228 if (v->mv_mode == MV_PMODE_MIXED_MV ||
229 ((v->mv_mode == MV_PMODE_INTENSITY_COMP) && (v->mv_mode2 == MV_PMODE_MIXED_MV)))
230 mixedmv_pic = 1;
231 else
232 mixedmv_pic = 0;
233 /* scale MV difference to be quad-pel */
234 dmv_x <<= 1 - s->quarter_sample;
235 dmv_y <<= 1 - s->quarter_sample;
236
237 wrap = s->b8_stride;
238 xy = s->block_index[n];
239
240 if (s->mb_intra) {
241 s->mv[0][n][0] = s->current_picture.motion_val[0][xy + v->blocks_off][0] = 0;
242 s->mv[0][n][1] = s->current_picture.motion_val[0][xy + v->blocks_off][1] = 0;
243 s->current_picture.motion_val[1][xy + v->blocks_off][0] = 0;
244 s->current_picture.motion_val[1][xy + v->blocks_off][1] = 0;
245 if (mv1) { /* duplicate motion data for 1-MV block */
246 s->current_picture.motion_val[0][xy + 1 + v->blocks_off][0] = 0;
247 s->current_picture.motion_val[0][xy + 1 + v->blocks_off][1] = 0;
248 s->current_picture.motion_val[0][xy + wrap + v->blocks_off][0] = 0;
249 s->current_picture.motion_val[0][xy + wrap + v->blocks_off][1] = 0;
250 s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][0] = 0;
251 s->current_picture.motion_val[0][xy + wrap + 1 + v->blocks_off][1] = 0;
252 v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;
253 s->current_picture.motion_val[1][xy + 1 + v->blocks_off][0] = 0;
254 s->current_picture.motion_val[1][xy + 1 + v->blocks_off][1] = 0;
255 s->current_picture.motion_val[1][xy + wrap][0] = 0;
256 s->current_picture.motion_val[1][xy + wrap + v->blocks_off][1] = 0;
257 s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][0] = 0;
258 s->current_picture.motion_val[1][xy + wrap + 1 + v->blocks_off][1] = 0;
259 }
260 return;
261 }
262
263 C = s->current_picture.motion_val[dir][xy - 1 + v->blocks_off];
264 A = s->current_picture.motion_val[dir][xy - wrap + v->blocks_off];
265 if (mv1) {
266 if (v->field_mode && mixedmv_pic)
267 off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
268 else
269 off = (s->mb_x == (s->mb_width - 1)) ? -1 : 2;
270 } else {
271 //in 4-MV mode different blocks have different B predictor position
272 switch (n) {
273 case 0:
274 off = (s->mb_x > 0) ? -1 : 1;
275 break;
276 case 1:
277 off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1;
278 break;
279 case 2:
280 off = 1;
281 break;
282 case 3:
283 off = -1;
284 }
285 }
286 B = s->current_picture.motion_val[dir][xy - wrap + off + v->blocks_off];
287
288 a_valid = !s->first_slice_line || (n == 2 || n == 3);
289 b_valid = a_valid && (s->mb_width > 1);
290 c_valid = s->mb_x || (n == 1 || n == 3);
291 if (v->field_mode) {
292 a_valid = a_valid && !is_intra[xy - wrap];
293 b_valid = b_valid && !is_intra[xy - wrap + off];
294 c_valid = c_valid && !is_intra[xy - 1];
295 }
296
297 if (a_valid) {
298 a_f = v->mv_f[dir][xy - wrap + v->blocks_off];
299 num_oppfield += a_f;
300 num_samefield += 1 - a_f;
301 field_predA[0] = A[0];
302 field_predA[1] = A[1];
303 } else {
304 field_predA[0] = field_predA[1] = 0;
305 a_f = 0;
306 }
307 if (b_valid) {
308 b_f = v->mv_f[dir][xy - wrap + off + v->blocks_off];
309 num_oppfield += b_f;
310 num_samefield += 1 - b_f;
311 field_predB[0] = B[0];
312 field_predB[1] = B[1];
313 } else {
314 field_predB[0] = field_predB[1] = 0;
315 b_f = 0;
316 }
317 if (c_valid) {
318 c_f = v->mv_f[dir][xy - 1 + v->blocks_off];
319 num_oppfield += c_f;
320 num_samefield += 1 - c_f;
321 field_predC[0] = C[0];
322 field_predC[1] = C[1];
323 } else {
324 field_predC[0] = field_predC[1] = 0;
325 c_f = 0;
326 }
327
328 if (v->field_mode) {
329 if (!v->numref)
330 // REFFIELD determines if the last field or the second-last field is
331 // to be used as reference
332 opposite = 1 - v->reffield;
333 else {
334 if (num_samefield <= num_oppfield)
335 opposite = 1 - pred_flag;
336 else
337 opposite = pred_flag;
338 }
339 } else
340 opposite = 0;
341 if (opposite) {
342 if (a_valid && !a_f) {
343 field_predA[0] = scaleforopp(v, field_predA[0], 0, dir);
344 field_predA[1] = scaleforopp(v, field_predA[1], 1, dir);
345 }
346 if (b_valid && !b_f) {
347 field_predB[0] = scaleforopp(v, field_predB[0], 0, dir);
348 field_predB[1] = scaleforopp(v, field_predB[1], 1, dir);
349 }
350 if (c_valid && !c_f) {
351 field_predC[0] = scaleforopp(v, field_predC[0], 0, dir);
352 field_predC[1] = scaleforopp(v, field_predC[1], 1, dir);
353 }
354 v->mv_f[dir][xy + v->blocks_off] = 1;
355 v->ref_field_type[dir] = !v->cur_field_type;
356 } else {
357 if (a_valid && a_f) {
358 field_predA[0] = scaleforsame(v, n, field_predA[0], 0, dir);
359 field_predA[1] = scaleforsame(v, n, field_predA[1], 1, dir);
360 }
361 if (b_valid && b_f) {
362 field_predB[0] = scaleforsame(v, n, field_predB[0], 0, dir);
363 field_predB[1] = scaleforsame(v, n, field_predB[1], 1, dir);
364 }
365 if (c_valid && c_f) {
366 field_predC[0] = scaleforsame(v, n, field_predC[0], 0, dir);
367 field_predC[1] = scaleforsame(v, n, field_predC[1], 1, dir);
368 }
369 v->mv_f[dir][xy + v->blocks_off] = 0;
370 v->ref_field_type[dir] = v->cur_field_type;
371 }
372
373 if (a_valid) {
374 px = field_predA[0];
375 py = field_predA[1];
376 } else if (c_valid) {
377 px = field_predC[0];
378 py = field_predC[1];
379 } else if (b_valid) {
380 px = field_predB[0];
381 py = field_predB[1];
382 } else {
383 px = 0;
384 py = 0;
385 }
386
387 if (num_samefield + num_oppfield > 1) {
388 px = mid_pred(field_predA[0], field_predB[0], field_predC[0]);
389 py = mid_pred(field_predA[1], field_predB[1], field_predC[1]);
390 }
391
392 /* Pullback MV as specified in 8.3.5.3.4 */
393 if (!v->field_mode) {
394 int qx, qy, X, Y;
395 qx = (s->mb_x << 6) + ((n == 1 || n == 3) ? 32 : 0);
396 qy = (s->mb_y << 6) + ((n == 2 || n == 3) ? 32 : 0);
397 X = (s->mb_width << 6) - 4;
398 Y = (s->mb_height << 6) - 4;
399 if (mv1) {
400 if (qx + px < -60) px = -60 - qx;
401 if (qy + py < -60) py = -60 - qy;
402 } else {
403 if (qx + px < -28) px = -28 - qx;
404 if (qy + py < -28) py = -28 - qy;
405 }
406 if (qx + px > X) px = X - qx;
407 if (qy + py > Y) py = Y - qy;
408 }
409
410 if (!v->field_mode || s->pict_type != AV_PICTURE_TYPE_B) {
411 /* Calculate hybrid prediction as specified in 8.3.5.3.5 (also 10.3.5.4.3.5) */
412 hybridmv_thresh = 32;
413 if (a_valid && c_valid) {
414 if (is_intra[xy - wrap])
415 sum = FFABS(px) + FFABS(py);
416 else
417 sum = FFABS(px - field_predA[0]) + FFABS(py - field_predA[1]);
418 if (sum > hybridmv_thresh) {
419 if (get_bits1(&s->gb)) { // read HYBRIDPRED bit
420 px = field_predA[0];
421 py = field_predA[1];
422 } else {
423 px = field_predC[0];
424 py = field_predC[1];
425 }
426 } else {
427 if (is_intra[xy - 1])
428 sum = FFABS(px) + FFABS(py);
429 else
430 sum = FFABS(px - field_predC[0]) + FFABS(py - field_predC[1]);
431 if (sum > hybridmv_thresh) {
432 if (get_bits1(&s->gb)) {
433 px = field_predA[0];
434 py = field_predA[1];
435 } else {
436 px = field_predC[0];
437 py = field_predC[1];
438 }
439 }
440 }
441 }
442 }
443
444 if (v->field_mode && v->numref)
445 r_y >>= 1;
446 if (v->field_mode && v->cur_field_type && v->ref_field_type[dir] == 0)
447 y_bias = 1;
448 /* store MV using signed modulus of MV range defined in 4.11 */
449 s->mv[dir][n][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;
450 s->mv[dir][n][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1] = ((py + dmv_y + r_y - y_bias) & ((r_y << 1) - 1)) - r_y + y_bias;
451 if (mv1) { /* duplicate motion data for 1-MV block */
452 s->current_picture.motion_val[dir][xy + 1 + v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];
453 s->current_picture.motion_val[dir][xy + 1 + v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];
454 s->current_picture.motion_val[dir][xy + wrap + v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];
455 s->current_picture.motion_val[dir][xy + wrap + v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];
456 s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][0] = s->current_picture.motion_val[dir][xy + v->blocks_off][0];
457 s->current_picture.motion_val[dir][xy + wrap + 1 + v->blocks_off][1] = s->current_picture.motion_val[dir][xy + v->blocks_off][1];
458 v->mv_f[dir][xy + 1 + v->blocks_off] = v->mv_f[dir][xy + v->blocks_off];
459 v->mv_f[dir][xy + wrap + v->blocks_off] = v->mv_f[dir][xy + wrap + 1 + v->blocks_off] = v->mv_f[dir][xy + v->blocks_off];
460 }
461}
462
463/** Predict and set motion vector for interlaced frame picture MBs
464 */
465void ff_vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,
466 int mvn, int r_x, int r_y, uint8_t* is_intra, int dir)
467{
468 MpegEncContext *s = &v->s;
469 int xy, wrap, off = 0;
470 int A[2], B[2], C[2];
471 int px = 0, py = 0;
472 int a_valid = 0, b_valid = 0, c_valid = 0;
473 int field_a, field_b, field_c; // 0: same, 1: opposit
474 int total_valid, num_samefield, num_oppfield;
475 int pos_c, pos_b, n_adj;
476
477 wrap = s->b8_stride;
478 xy = s->block_index[n];
479
480 if (s->mb_intra) {
481 s->mv[0][n][0] = s->current_picture.motion_val[0][xy][0] = 0;
482 s->mv[0][n][1] = s->current_picture.motion_val[0][xy][1] = 0;
483 s->current_picture.motion_val[1][xy][0] = 0;
484 s->current_picture.motion_val[1][xy][1] = 0;
485 if (mvn == 1) { /* duplicate motion data for 1-MV block */
486 s->current_picture.motion_val[0][xy + 1][0] = 0;
487 s->current_picture.motion_val[0][xy + 1][1] = 0;
488 s->current_picture.motion_val[0][xy + wrap][0] = 0;
489 s->current_picture.motion_val[0][xy + wrap][1] = 0;
490 s->current_picture.motion_val[0][xy + wrap + 1][0] = 0;
491 s->current_picture.motion_val[0][xy + wrap + 1][1] = 0;
492 v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;
493 s->current_picture.motion_val[1][xy + 1][0] = 0;
494 s->current_picture.motion_val[1][xy + 1][1] = 0;
495 s->current_picture.motion_val[1][xy + wrap][0] = 0;
496 s->current_picture.motion_val[1][xy + wrap][1] = 0;
497 s->current_picture.motion_val[1][xy + wrap + 1][0] = 0;
498 s->current_picture.motion_val[1][xy + wrap + 1][1] = 0;
499 }
500 return;
501 }
502
503 off = ((n == 0) || (n == 1)) ? 1 : -1;
504 /* predict A */
505 if (s->mb_x || (n == 1) || (n == 3)) {
506 if ((v->blk_mv_type[xy]) // current block (MB) has a field MV
507 || (!v->blk_mv_type[xy] && !v->blk_mv_type[xy - 1])) { // or both have frame MV
508 A[0] = s->current_picture.motion_val[dir][xy - 1][0];
509 A[1] = s->current_picture.motion_val[dir][xy - 1][1];
510 a_valid = 1;
511 } else { // current block has frame mv and cand. has field MV (so average)
512 A[0] = (s->current_picture.motion_val[dir][xy - 1][0]
513 + s->current_picture.motion_val[dir][xy - 1 + off * wrap][0] + 1) >> 1;
514 A[1] = (s->current_picture.motion_val[dir][xy - 1][1]
515 + s->current_picture.motion_val[dir][xy - 1 + off * wrap][1] + 1) >> 1;
516 a_valid = 1;
517 }
518 if (!(n & 1) && v->is_intra[s->mb_x - 1]) {
519 a_valid = 0;
520 A[0] = A[1] = 0;
521 }
522 } else
523 A[0] = A[1] = 0;
524 /* Predict B and C */
525 B[0] = B[1] = C[0] = C[1] = 0;
526 if (n == 0 || n == 1 || v->blk_mv_type[xy]) {
527 if (!s->first_slice_line) {
528 if (!v->is_intra[s->mb_x - s->mb_stride]) {
529 b_valid = 1;
530 n_adj = n | 2;
531 pos_b = s->block_index[n_adj] - 2 * wrap;
532 if (v->blk_mv_type[pos_b] && v->blk_mv_type[xy]) {
533 n_adj = (n & 2) | (n & 1);
534 }
535 B[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][0];
536 B[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap][1];
537 if (v->blk_mv_type[pos_b] && !v->blk_mv_type[xy]) {
538 B[0] = (B[0] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][0] + 1) >> 1;
539 B[1] = (B[1] + s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap][1] + 1) >> 1;
540 }
541 }
542 if (s->mb_width > 1) {
543 if (!v->is_intra[s->mb_x - s->mb_stride + 1]) {
544 c_valid = 1;
545 n_adj = 2;
546 pos_c = s->block_index[2] - 2 * wrap + 2;
547 if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {
548 n_adj = n & 2;
549 }
550 C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][0];
551 C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap + 2][1];
552 if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {
553 C[0] = (1 + C[0] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][0])) >> 1;
554 C[1] = (1 + C[1] + (s->current_picture.motion_val[dir][s->block_index[n_adj ^ 2] - 2 * wrap + 2][1])) >> 1;
555 }
556 if (s->mb_x == s->mb_width - 1) {
557 if (!v->is_intra[s->mb_x - s->mb_stride - 1]) {
558 c_valid = 1;
559 n_adj = 3;
560 pos_c = s->block_index[3] - 2 * wrap - 2;
561 if (v->blk_mv_type[pos_c] && v->blk_mv_type[xy]) {
562 n_adj = n | 1;
563 }
564 C[0] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][0];
565 C[1] = s->current_picture.motion_val[dir][s->block_index[n_adj] - 2 * wrap - 2][1];
566 if (v->blk_mv_type[pos_c] && !v->blk_mv_type[xy]) {
567 C[0] = (1 + C[0] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][0]) >> 1;
568 C[1] = (1 + C[1] + s->current_picture.motion_val[dir][s->block_index[1] - 2 * wrap - 2][1]) >> 1;
569 }
570 } else
571 c_valid = 0;
572 }
573 }
574 }
575 }
576 } else {
577 pos_b = s->block_index[1];
578 b_valid = 1;
579 B[0] = s->current_picture.motion_val[dir][pos_b][0];
580 B[1] = s->current_picture.motion_val[dir][pos_b][1];
581 pos_c = s->block_index[0];
582 c_valid = 1;
583 C[0] = s->current_picture.motion_val[dir][pos_c][0];
584 C[1] = s->current_picture.motion_val[dir][pos_c][1];
585 }
586
587 total_valid = a_valid + b_valid + c_valid;
588 // check if predictor A is out of bounds
589 if (!s->mb_x && !(n == 1 || n == 3)) {
590 A[0] = A[1] = 0;
591 }
592 // check if predictor B is out of bounds
593 if ((s->first_slice_line && v->blk_mv_type[xy]) || (s->first_slice_line && !(n & 2))) {
594 B[0] = B[1] = C[0] = C[1] = 0;
595 }
596 if (!v->blk_mv_type[xy]) {
597 if (s->mb_width == 1) {
598 px = B[0];
599 py = B[1];
600 } else {
601 if (total_valid >= 2) {
602 px = mid_pred(A[0], B[0], C[0]);
603 py = mid_pred(A[1], B[1], C[1]);
604 } else if (total_valid) {
605 if (a_valid) { px = A[0]; py = A[1]; }
606 else if (b_valid) { px = B[0]; py = B[1]; }
607 else { px = C[0]; py = C[1]; }
608 }
609 }
610 } else {
611 if (a_valid)
612 field_a = (A[1] & 4) ? 1 : 0;
613 else
614 field_a = 0;
615 if (b_valid)
616 field_b = (B[1] & 4) ? 1 : 0;
617 else
618 field_b = 0;
619 if (c_valid)
620 field_c = (C[1] & 4) ? 1 : 0;
621 else
622 field_c = 0;
623
624 num_oppfield = field_a + field_b + field_c;
625 num_samefield = total_valid - num_oppfield;
626 if (total_valid == 3) {
627 if ((num_samefield == 3) || (num_oppfield == 3)) {
628 px = mid_pred(A[0], B[0], C[0]);
629 py = mid_pred(A[1], B[1], C[1]);
630 } else if (num_samefield >= num_oppfield) {
631 /* take one MV from same field set depending on priority
632 the check for B may not be necessary */
633 px = !field_a ? A[0] : B[0];
634 py = !field_a ? A[1] : B[1];
635 } else {
636 px = field_a ? A[0] : B[0];
637 py = field_a ? A[1] : B[1];
638 }
639 } else if (total_valid == 2) {
640 if (num_samefield >= num_oppfield) {
641 if (!field_a && a_valid) {
642 px = A[0];
643 py = A[1];
644 } else if (!field_b && b_valid) {
645 px = B[0];
646 py = B[1];
647 } else /*if (c_valid)*/ {
648 av_assert1(c_valid);
649 px = C[0];
650 py = C[1];
651 }
652 } else {
653 if (field_a && a_valid) {
654 px = A[0];
655 py = A[1];
656 } else /*if (field_b && b_valid)*/ {
657 av_assert1(field_b && b_valid);
658 px = B[0];
659 py = B[1];
660 }
661 }
662 } else if (total_valid == 1) {
663 px = (a_valid) ? A[0] : ((b_valid) ? B[0] : C[0]);
664 py = (a_valid) ? A[1] : ((b_valid) ? B[1] : C[1]);
665 }
666 }
667
668 /* store MV using signed modulus of MV range defined in 4.11 */
669 s->mv[dir][n][0] = s->current_picture.motion_val[dir][xy][0] = ((px + dmv_x + r_x) & ((r_x << 1) - 1)) - r_x;
670 s->mv[dir][n][1] = s->current_picture.motion_val[dir][xy][1] = ((py + dmv_y + r_y) & ((r_y << 1) - 1)) - r_y;
671 if (mvn == 1) { /* duplicate motion data for 1-MV block */
672 s->current_picture.motion_val[dir][xy + 1 ][0] = s->current_picture.motion_val[dir][xy][0];
673 s->current_picture.motion_val[dir][xy + 1 ][1] = s->current_picture.motion_val[dir][xy][1];
674 s->current_picture.motion_val[dir][xy + wrap ][0] = s->current_picture.motion_val[dir][xy][0];
675 s->current_picture.motion_val[dir][xy + wrap ][1] = s->current_picture.motion_val[dir][xy][1];
676 s->current_picture.motion_val[dir][xy + wrap + 1][0] = s->current_picture.motion_val[dir][xy][0];
677 s->current_picture.motion_val[dir][xy + wrap + 1][1] = s->current_picture.motion_val[dir][xy][1];
678 } else if (mvn == 2) { /* duplicate motion data for 2-Field MV block */
679 s->current_picture.motion_val[dir][xy + 1][0] = s->current_picture.motion_val[dir][xy][0];
680 s->current_picture.motion_val[dir][xy + 1][1] = s->current_picture.motion_val[dir][xy][1];
681 s->mv[dir][n + 1][0] = s->mv[dir][n][0];
682 s->mv[dir][n + 1][1] = s->mv[dir][n][1];
683 }
684}
685
686void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],
687 int direct, int mvtype)
688{
689 MpegEncContext *s = &v->s;
690 int xy, wrap, off = 0;
691 int16_t *A, *B, *C;
692 int px, py;
693 int sum;
694 int r_x, r_y;
695 const uint8_t *is_intra = v->mb_type[0];
696
697 av_assert0(!v->field_mode);
698
699 r_x = v->range_x;
700 r_y = v->range_y;
701 /* scale MV difference to be quad-pel */
702 dmv_x[0] <<= 1 - s->quarter_sample;
703 dmv_y[0] <<= 1 - s->quarter_sample;
704 dmv_x[1] <<= 1 - s->quarter_sample;
705 dmv_y[1] <<= 1 - s->quarter_sample;
706
707 wrap = s->b8_stride;
708 xy = s->block_index[0];
709
710 if (s->mb_intra) {
711 s->current_picture.motion_val[0][xy][0] =
712 s->current_picture.motion_val[0][xy][1] =
713 s->current_picture.motion_val[1][xy][0] =
714 s->current_picture.motion_val[1][xy][1] = 0;
715 return;
716 }
717 if (direct && s->next_picture_ptr->field_picture)
718 av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");
719
720 s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 0, s->quarter_sample);
721 s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample);
722 s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample);
723 s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample);
724
725 /* Pullback predicted motion vectors as specified in 8.4.5.4 */
726 s->mv[0][0][0] = av_clip(s->mv[0][0][0], -60 - (s->mb_x << 6), (s->mb_width << 6) - 4 - (s->mb_x << 6));
727 s->mv[0][0][1] = av_clip(s->mv[0][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));
728 s->mv[1][0][0] = av_clip(s->mv[1][0][0], -60 - (s->mb_x << 6), (s->mb_width << 6) - 4 - (s->mb_x << 6));
729 s->mv[1][0][1] = av_clip(s->mv[1][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6));
730 if (direct) {
731 s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
732 s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
733 s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
734 s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];
735 return;
736 }
737
738 if ((mvtype == BMV_TYPE_FORWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {
739 C = s->current_picture.motion_val[0][xy - 2];
740 A = s->current_picture.motion_val[0][xy - wrap * 2];
741 off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
742 B = s->current_picture.motion_val[0][xy - wrap * 2 + off];
743
744 if (!s->mb_x) C[0] = C[1] = 0;
745 if (!s->first_slice_line) { // predictor A is not out of bounds
746 if (s->mb_width == 1) {
747 px = A[0];
748 py = A[1];
749 } else {
750 px = mid_pred(A[0], B[0], C[0]);
751 py = mid_pred(A[1], B[1], C[1]);
752 }
753 } else if (s->mb_x) { // predictor C is not out of bounds
754 px = C[0];
755 py = C[1];
756 } else {
757 px = py = 0;
758 }
759 /* Pullback MV as specified in 8.3.5.3.4 */
760 {
761 int qx, qy, X, Y;
762 if (v->profile < PROFILE_ADVANCED) {
763 qx = (s->mb_x << 5);
764 qy = (s->mb_y << 5);
765 X = (s->mb_width << 5) - 4;
766 Y = (s->mb_height << 5) - 4;
767 if (qx + px < -28) px = -28 - qx;
768 if (qy + py < -28) py = -28 - qy;
769 if (qx + px > X) px = X - qx;
770 if (qy + py > Y) py = Y - qy;
771 } else {
772 qx = (s->mb_x << 6);
773 qy = (s->mb_y << 6);
774 X = (s->mb_width << 6) - 4;
775 Y = (s->mb_height << 6) - 4;
776 if (qx + px < -60) px = -60 - qx;
777 if (qy + py < -60) py = -60 - qy;
778 if (qx + px > X) px = X - qx;
779 if (qy + py > Y) py = Y - qy;
780 }
781 }
782 /* Calculate hybrid prediction as specified in 8.3.5.3.5 */
783 if (0 && !s->first_slice_line && s->mb_x) {
784 if (is_intra[xy - wrap])
785 sum = FFABS(px) + FFABS(py);
786 else
787 sum = FFABS(px - A[0]) + FFABS(py - A[1]);
788 if (sum > 32) {
789 if (get_bits1(&s->gb)) {
790 px = A[0];
791 py = A[1];
792 } else {
793 px = C[0];
794 py = C[1];
795 }
796 } else {
797 if (is_intra[xy - 2])
798 sum = FFABS(px) + FFABS(py);
799 else
800 sum = FFABS(px - C[0]) + FFABS(py - C[1]);
801 if (sum > 32) {
802 if (get_bits1(&s->gb)) {
803 px = A[0];
804 py = A[1];
805 } else {
806 px = C[0];
807 py = C[1];
808 }
809 }
810 }
811 }
812 /* store MV using signed modulus of MV range defined in 4.11 */
813 s->mv[0][0][0] = ((px + dmv_x[0] + r_x) & ((r_x << 1) - 1)) - r_x;
814 s->mv[0][0][1] = ((py + dmv_y[0] + r_y) & ((r_y << 1) - 1)) - r_y;
815 }
816 if ((mvtype == BMV_TYPE_BACKWARD) || (mvtype == BMV_TYPE_INTERPOLATED)) {
817 C = s->current_picture.motion_val[1][xy - 2];
818 A = s->current_picture.motion_val[1][xy - wrap * 2];
819 off = (s->mb_x == (s->mb_width - 1)) ? -2 : 2;
820 B = s->current_picture.motion_val[1][xy - wrap * 2 + off];
821
822 if (!s->mb_x)
823 C[0] = C[1] = 0;
824 if (!s->first_slice_line) { // predictor A is not out of bounds
825 if (s->mb_width == 1) {
826 px = A[0];
827 py = A[1];
828 } else {
829 px = mid_pred(A[0], B[0], C[0]);
830 py = mid_pred(A[1], B[1], C[1]);
831 }
832 } else if (s->mb_x) { // predictor C is not out of bounds
833 px = C[0];
834 py = C[1];
835 } else {
836 px = py = 0;
837 }
838 /* Pullback MV as specified in 8.3.5.3.4 */
839 {
840 int qx, qy, X, Y;
841 if (v->profile < PROFILE_ADVANCED) {
842 qx = (s->mb_x << 5);
843 qy = (s->mb_y << 5);
844 X = (s->mb_width << 5) - 4;
845 Y = (s->mb_height << 5) - 4;
846 if (qx + px < -28) px = -28 - qx;
847 if (qy + py < -28) py = -28 - qy;
848 if (qx + px > X) px = X - qx;
849 if (qy + py > Y) py = Y - qy;
850 } else {
851 qx = (s->mb_x << 6);
852 qy = (s->mb_y << 6);
853 X = (s->mb_width << 6) - 4;
854 Y = (s->mb_height << 6) - 4;
855 if (qx + px < -60) px = -60 - qx;
856 if (qy + py < -60) py = -60 - qy;
857 if (qx + px > X) px = X - qx;
858 if (qy + py > Y) py = Y - qy;
859 }
860 }
861 /* Calculate hybrid prediction as specified in 8.3.5.3.5 */
862 if (0 && !s->first_slice_line && s->mb_x) {
863 if (is_intra[xy - wrap])
864 sum = FFABS(px) + FFABS(py);
865 else
866 sum = FFABS(px - A[0]) + FFABS(py - A[1]);
867 if (sum > 32) {
868 if (get_bits1(&s->gb)) {
869 px = A[0];
870 py = A[1];
871 } else {
872 px = C[0];
873 py = C[1];
874 }
875 } else {
876 if (is_intra[xy - 2])
877 sum = FFABS(px) + FFABS(py);
878 else
879 sum = FFABS(px - C[0]) + FFABS(py - C[1]);
880 if (sum > 32) {
881 if (get_bits1(&s->gb)) {
882 px = A[0];
883 py = A[1];
884 } else {
885 px = C[0];
886 py = C[1];
887 }
888 }
889 }
890 }
891 /* store MV using signed modulus of MV range defined in 4.11 */
892
893 s->mv[1][0][0] = ((px + dmv_x[1] + r_x) & ((r_x << 1) - 1)) - r_x;
894 s->mv[1][0][1] = ((py + dmv_y[1] + r_y) & ((r_y << 1) - 1)) - r_y;
895 }
896 s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0];
897 s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1];
898 s->current_picture.motion_val[1][xy][0] = s->mv[1][0][0];
899 s->current_picture.motion_val[1][xy][1] = s->mv[1][0][1];
900}
901
902void ff_vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y,
903 int mv1, int *pred_flag)
904{
905 int dir = (v->bmvtype == BMV_TYPE_BACKWARD) ? 1 : 0;
906 MpegEncContext *s = &v->s;
907 int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
908
909 if (v->bmvtype == BMV_TYPE_DIRECT) {
910 int total_opp, k, f;
911 if (s->next_picture.mb_type[mb_pos + v->mb_off] != MB_TYPE_INTRA) {
912 s->mv[0][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],
913 v->bfraction, 0, s->quarter_sample);
914 s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],
915 v->bfraction, 0, s->quarter_sample);
916 s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],
917 v->bfraction, 1, s->quarter_sample);
918 s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0] + v->blocks_off][1],
919 v->bfraction, 1, s->quarter_sample);
920
921 total_opp = v->mv_f_next[0][s->block_index[0] + v->blocks_off]
922 + v->mv_f_next[0][s->block_index[1] + v->blocks_off]
923 + v->mv_f_next[0][s->block_index[2] + v->blocks_off]
924 + v->mv_f_next[0][s->block_index[3] + v->blocks_off];
925 f = (total_opp > 2) ? 1 : 0;
926 } else {
927 s->mv[0][0][0] = s->mv[0][0][1] = 0;
928 s->mv[1][0][0] = s->mv[1][0][1] = 0;
929 f = 0;
930 }
931 v->ref_field_type[0] = v->ref_field_type[1] = v->cur_field_type ^ f;
932 for (k = 0; k < 4; k++) {
933 s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][0] = s->mv[0][0][0];
934 s->current_picture.motion_val[0][s->block_index[k] + v->blocks_off][1] = s->mv[0][0][1];
935 s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][0] = s->mv[1][0][0];
936 s->current_picture.motion_val[1][s->block_index[k] + v->blocks_off][1] = s->mv[1][0][1];
937 v->mv_f[0][s->block_index[k] + v->blocks_off] = f;
938 v->mv_f[1][s->block_index[k] + v->blocks_off] = f;
939 }
940 return;
941 }
942 if (v->bmvtype == BMV_TYPE_INTERPOLATED) {
943 ff_vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0], 1, v->range_x, v->range_y, v->mb_type[0], pred_flag[0], 0);
944 ff_vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1], 1, v->range_x, v->range_y, v->mb_type[0], pred_flag[1], 1);
945 return;
946 }
947 if (dir) { // backward
948 ff_vc1_pred_mv(v, n, dmv_x[1], dmv_y[1], mv1, v->range_x, v->range_y, v->mb_type[0], pred_flag[1], 1);
949 if (n == 3 || mv1) {
950 ff_vc1_pred_mv(v, 0, dmv_x[0], dmv_y[0], 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);
951 }
952 } else { // forward
953 ff_vc1_pred_mv(v, n, dmv_x[0], dmv_y[0], mv1, v->range_x, v->range_y, v->mb_type[0], pred_flag[0], 0);
954 if (n == 3 || mv1) {
955 ff_vc1_pred_mv(v, 0, dmv_x[1], dmv_y[1], 1, v->range_x, v->range_y, v->mb_type[0], 0, 1);
956 }
957 }
958}
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