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[libav.git] / libavcodec / error_resilience.c
1 /*
2 * Error resilience / concealment
3 *
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file libavcodec/error_resilience.c
25 * Error resilience / concealment.
26 */
27
28 #include <limits.h>
29
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33
34 static void decode_mb(MpegEncContext *s){
35 s->dest[0] = s->current_picture.data[0] + (s->mb_y * 16* s->linesize ) + s->mb_x * 16;
36 s->dest[1] = s->current_picture.data[1] + (s->mb_y * 8 * s->uvlinesize) + s->mb_x * 8;
37 s->dest[2] = s->current_picture.data[2] + (s->mb_y * 8 * s->uvlinesize) + s->mb_x * 8;
38
39 MPV_decode_mb(s, s->block);
40 }
41
42 /**
43 * replaces the current MB with a flat dc only version.
44 */
45 static void put_dc(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, int mb_x, int mb_y)
46 {
47 int dc, dcu, dcv, y, i;
48 for(i=0; i<4; i++){
49 dc= s->dc_val[0][mb_x*2 + (i&1) + (mb_y*2 + (i>>1))*s->b8_stride];
50 if(dc<0) dc=0;
51 else if(dc>2040) dc=2040;
52 for(y=0; y<8; y++){
53 int x;
54 for(x=0; x<8; x++){
55 dest_y[x + (i&1)*8 + (y + (i>>1)*8)*s->linesize]= dc/8;
56 }
57 }
58 }
59 dcu = s->dc_val[1][mb_x + mb_y*s->mb_stride];
60 dcv = s->dc_val[2][mb_x + mb_y*s->mb_stride];
61 if (dcu<0 ) dcu=0;
62 else if(dcu>2040) dcu=2040;
63 if (dcv<0 ) dcv=0;
64 else if(dcv>2040) dcv=2040;
65 for(y=0; y<8; y++){
66 int x;
67 for(x=0; x<8; x++){
68 dest_cb[x + y*(s->uvlinesize)]= dcu/8;
69 dest_cr[x + y*(s->uvlinesize)]= dcv/8;
70 }
71 }
72 }
73
74 static void filter181(int16_t *data, int width, int height, int stride){
75 int x,y;
76
77 /* horizontal filter */
78 for(y=1; y<height-1; y++){
79 int prev_dc= data[0 + y*stride];
80
81 for(x=1; x<width-1; x++){
82 int dc;
83
84 dc= - prev_dc
85 + data[x + y*stride]*8
86 - data[x + 1 + y*stride];
87 dc= (dc*10923 + 32768)>>16;
88 prev_dc= data[x + y*stride];
89 data[x + y*stride]= dc;
90 }
91 }
92
93 /* vertical filter */
94 for(x=1; x<width-1; x++){
95 int prev_dc= data[x];
96
97 for(y=1; y<height-1; y++){
98 int dc;
99
100 dc= - prev_dc
101 + data[x + y *stride]*8
102 - data[x + (y+1)*stride];
103 dc= (dc*10923 + 32768)>>16;
104 prev_dc= data[x + y*stride];
105 data[x + y*stride]= dc;
106 }
107 }
108 }
109
110 /**
111 * guess the dc of blocks which do not have an undamaged dc
112 * @param w width in 8 pixel blocks
113 * @param h height in 8 pixel blocks
114 */
115 static void guess_dc(MpegEncContext *s, int16_t *dc, int w, int h, int stride, int is_luma){
116 int b_x, b_y;
117
118 for(b_y=0; b_y<h; b_y++){
119 for(b_x=0; b_x<w; b_x++){
120 int color[4]={1024,1024,1024,1024};
121 int distance[4]={9999,9999,9999,9999};
122 int mb_index, error, j;
123 int64_t guess, weight_sum;
124
125 mb_index= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;
126
127 error= s->error_status_table[mb_index];
128
129 if(IS_INTER(s->current_picture.mb_type[mb_index])) continue; //inter
130 if(!(error&DC_ERROR)) continue; //dc-ok
131
132 /* right block */
133 for(j=b_x+1; j<w; j++){
134 int mb_index_j= (j>>is_luma) + (b_y>>is_luma)*s->mb_stride;
135 int error_j= s->error_status_table[mb_index_j];
136 int intra_j= IS_INTRA(s->current_picture.mb_type[mb_index_j]);
137 if(intra_j==0 || !(error_j&DC_ERROR)){
138 color[0]= dc[j + b_y*stride];
139 distance[0]= j-b_x;
140 break;
141 }
142 }
143
144 /* left block */
145 for(j=b_x-1; j>=0; j--){
146 int mb_index_j= (j>>is_luma) + (b_y>>is_luma)*s->mb_stride;
147 int error_j= s->error_status_table[mb_index_j];
148 int intra_j= IS_INTRA(s->current_picture.mb_type[mb_index_j]);
149 if(intra_j==0 || !(error_j&DC_ERROR)){
150 color[1]= dc[j + b_y*stride];
151 distance[1]= b_x-j;
152 break;
153 }
154 }
155
156 /* bottom block */
157 for(j=b_y+1; j<h; j++){
158 int mb_index_j= (b_x>>is_luma) + (j>>is_luma)*s->mb_stride;
159 int error_j= s->error_status_table[mb_index_j];
160 int intra_j= IS_INTRA(s->current_picture.mb_type[mb_index_j]);
161 if(intra_j==0 || !(error_j&DC_ERROR)){
162 color[2]= dc[b_x + j*stride];
163 distance[2]= j-b_y;
164 break;
165 }
166 }
167
168 /* top block */
169 for(j=b_y-1; j>=0; j--){
170 int mb_index_j= (b_x>>is_luma) + (j>>is_luma)*s->mb_stride;
171 int error_j= s->error_status_table[mb_index_j];
172 int intra_j= IS_INTRA(s->current_picture.mb_type[mb_index_j]);
173 if(intra_j==0 || !(error_j&DC_ERROR)){
174 color[3]= dc[b_x + j*stride];
175 distance[3]= b_y-j;
176 break;
177 }
178 }
179
180 weight_sum=0;
181 guess=0;
182 for(j=0; j<4; j++){
183 int64_t weight= 256*256*256*16/distance[j];
184 guess+= weight*(int64_t)color[j];
185 weight_sum+= weight;
186 }
187 guess= (guess + weight_sum/2) / weight_sum;
188
189 dc[b_x + b_y*stride]= guess;
190 }
191 }
192 }
193
194 /**
195 * simple horizontal deblocking filter used for error resilience
196 * @param w width in 8 pixel blocks
197 * @param h height in 8 pixel blocks
198 */
199 static void h_block_filter(MpegEncContext *s, uint8_t *dst, int w, int h, int stride, int is_luma){
200 int b_x, b_y;
201 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
202
203 for(b_y=0; b_y<h; b_y++){
204 for(b_x=0; b_x<w-1; b_x++){
205 int y;
206 int left_status = s->error_status_table[( b_x >>is_luma) + (b_y>>is_luma)*s->mb_stride];
207 int right_status= s->error_status_table[((b_x+1)>>is_luma) + (b_y>>is_luma)*s->mb_stride];
208 int left_intra= IS_INTRA(s->current_picture.mb_type [( b_x >>is_luma) + (b_y>>is_luma)*s->mb_stride]);
209 int right_intra= IS_INTRA(s->current_picture.mb_type [((b_x+1)>>is_luma) + (b_y>>is_luma)*s->mb_stride]);
210 int left_damage = left_status&(DC_ERROR|AC_ERROR|MV_ERROR);
211 int right_damage= right_status&(DC_ERROR|AC_ERROR|MV_ERROR);
212 int offset= b_x*8 + b_y*stride*8;
213 int16_t *left_mv= s->current_picture.motion_val[0][s->b8_stride*(b_y<<(1-is_luma)) + ( b_x <<(1-is_luma))];
214 int16_t *right_mv= s->current_picture.motion_val[0][s->b8_stride*(b_y<<(1-is_luma)) + ((b_x+1)<<(1-is_luma))];
215
216 if(!(left_damage||right_damage)) continue; // both undamaged
217
218 if( (!left_intra) && (!right_intra)
219 && FFABS(left_mv[0]-right_mv[0]) + FFABS(left_mv[1]+right_mv[1]) < 2) continue;
220
221 for(y=0; y<8; y++){
222 int a,b,c,d;
223
224 a= dst[offset + 7 + y*stride] - dst[offset + 6 + y*stride];
225 b= dst[offset + 8 + y*stride] - dst[offset + 7 + y*stride];
226 c= dst[offset + 9 + y*stride] - dst[offset + 8 + y*stride];
227
228 d= FFABS(b) - ((FFABS(a) + FFABS(c) + 1)>>1);
229 d= FFMAX(d, 0);
230 if(b<0) d= -d;
231
232 if(d==0) continue;
233
234 if(!(left_damage && right_damage))
235 d= d*16/9;
236
237 if(left_damage){
238 dst[offset + 7 + y*stride] = cm[dst[offset + 7 + y*stride] + ((d*7)>>4)];
239 dst[offset + 6 + y*stride] = cm[dst[offset + 6 + y*stride] + ((d*5)>>4)];
240 dst[offset + 5 + y*stride] = cm[dst[offset + 5 + y*stride] + ((d*3)>>4)];
241 dst[offset + 4 + y*stride] = cm[dst[offset + 4 + y*stride] + ((d*1)>>4)];
242 }
243 if(right_damage){
244 dst[offset + 8 + y*stride] = cm[dst[offset + 8 + y*stride] - ((d*7)>>4)];
245 dst[offset + 9 + y*stride] = cm[dst[offset + 9 + y*stride] - ((d*5)>>4)];
246 dst[offset + 10+ y*stride] = cm[dst[offset +10 + y*stride] - ((d*3)>>4)];
247 dst[offset + 11+ y*stride] = cm[dst[offset +11 + y*stride] - ((d*1)>>4)];
248 }
249 }
250 }
251 }
252 }
253
254 /**
255 * simple vertical deblocking filter used for error resilience
256 * @param w width in 8 pixel blocks
257 * @param h height in 8 pixel blocks
258 */
259 static void v_block_filter(MpegEncContext *s, uint8_t *dst, int w, int h, int stride, int is_luma){
260 int b_x, b_y;
261 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
262
263 for(b_y=0; b_y<h-1; b_y++){
264 for(b_x=0; b_x<w; b_x++){
265 int x;
266 int top_status = s->error_status_table[(b_x>>is_luma) + ( b_y >>is_luma)*s->mb_stride];
267 int bottom_status= s->error_status_table[(b_x>>is_luma) + ((b_y+1)>>is_luma)*s->mb_stride];
268 int top_intra= IS_INTRA(s->current_picture.mb_type [(b_x>>is_luma) + ( b_y >>is_luma)*s->mb_stride]);
269 int bottom_intra= IS_INTRA(s->current_picture.mb_type [(b_x>>is_luma) + ((b_y+1)>>is_luma)*s->mb_stride]);
270 int top_damage = top_status&(DC_ERROR|AC_ERROR|MV_ERROR);
271 int bottom_damage= bottom_status&(DC_ERROR|AC_ERROR|MV_ERROR);
272 int offset= b_x*8 + b_y*stride*8;
273 int16_t *top_mv= s->current_picture.motion_val[0][s->b8_stride*( b_y <<(1-is_luma)) + (b_x<<(1-is_luma))];
274 int16_t *bottom_mv= s->current_picture.motion_val[0][s->b8_stride*((b_y+1)<<(1-is_luma)) + (b_x<<(1-is_luma))];
275
276 if(!(top_damage||bottom_damage)) continue; // both undamaged
277
278 if( (!top_intra) && (!bottom_intra)
279 && FFABS(top_mv[0]-bottom_mv[0]) + FFABS(top_mv[1]+bottom_mv[1]) < 2) continue;
280
281 for(x=0; x<8; x++){
282 int a,b,c,d;
283
284 a= dst[offset + x + 7*stride] - dst[offset + x + 6*stride];
285 b= dst[offset + x + 8*stride] - dst[offset + x + 7*stride];
286 c= dst[offset + x + 9*stride] - dst[offset + x + 8*stride];
287
288 d= FFABS(b) - ((FFABS(a) + FFABS(c)+1)>>1);
289 d= FFMAX(d, 0);
290 if(b<0) d= -d;
291
292 if(d==0) continue;
293
294 if(!(top_damage && bottom_damage))
295 d= d*16/9;
296
297 if(top_damage){
298 dst[offset + x + 7*stride] = cm[dst[offset + x + 7*stride] + ((d*7)>>4)];
299 dst[offset + x + 6*stride] = cm[dst[offset + x + 6*stride] + ((d*5)>>4)];
300 dst[offset + x + 5*stride] = cm[dst[offset + x + 5*stride] + ((d*3)>>4)];
301 dst[offset + x + 4*stride] = cm[dst[offset + x + 4*stride] + ((d*1)>>4)];
302 }
303 if(bottom_damage){
304 dst[offset + x + 8*stride] = cm[dst[offset + x + 8*stride] - ((d*7)>>4)];
305 dst[offset + x + 9*stride] = cm[dst[offset + x + 9*stride] - ((d*5)>>4)];
306 dst[offset + x + 10*stride] = cm[dst[offset + x + 10*stride] - ((d*3)>>4)];
307 dst[offset + x + 11*stride] = cm[dst[offset + x + 11*stride] - ((d*1)>>4)];
308 }
309 }
310 }
311 }
312 }
313
314 static void guess_mv(MpegEncContext *s){
315 uint8_t fixed[s->mb_stride * s->mb_height];
316 #define MV_FROZEN 3
317 #define MV_CHANGED 2
318 #define MV_UNCHANGED 1
319 const int mb_stride = s->mb_stride;
320 const int mb_width = s->mb_width;
321 const int mb_height= s->mb_height;
322 int i, depth, num_avail;
323 int mb_x, mb_y;
324
325 num_avail=0;
326 for(i=0; i<s->mb_num; i++){
327 const int mb_xy= s->mb_index2xy[ i ];
328 int f=0;
329 int error= s->error_status_table[mb_xy];
330
331 if(IS_INTRA(s->current_picture.mb_type[mb_xy])) f=MV_FROZEN; //intra //FIXME check
332 if(!(error&MV_ERROR)) f=MV_FROZEN; //inter with undamaged MV
333
334 fixed[mb_xy]= f;
335 if(f==MV_FROZEN)
336 num_avail++;
337 }
338
339 if((!(s->avctx->error_concealment&FF_EC_GUESS_MVS)) || num_avail <= mb_width/2){
340 for(mb_y=0; mb_y<s->mb_height; mb_y++){
341 for(mb_x=0; mb_x<s->mb_width; mb_x++){
342 const int mb_xy= mb_x + mb_y*s->mb_stride;
343
344 if(IS_INTRA(s->current_picture.mb_type[mb_xy])) continue;
345 if(!(s->error_status_table[mb_xy]&MV_ERROR)) continue;
346
347 s->mv_dir = MV_DIR_FORWARD;
348 s->mb_intra=0;
349 s->mv_type = MV_TYPE_16X16;
350 s->mb_skipped=0;
351
352 s->dsp.clear_blocks(s->block[0]);
353
354 s->mb_x= mb_x;
355 s->mb_y= mb_y;
356 s->mv[0][0][0]= 0;
357 s->mv[0][0][1]= 0;
358 decode_mb(s);
359 }
360 }
361 return;
362 }
363
364 for(depth=0;; depth++){
365 int changed, pass, none_left;
366
367 none_left=1;
368 changed=1;
369 for(pass=0; (changed || pass<2) && pass<10; pass++){
370 int mb_x, mb_y;
371 int score_sum=0;
372
373 changed=0;
374 for(mb_y=0; mb_y<s->mb_height; mb_y++){
375 for(mb_x=0; mb_x<s->mb_width; mb_x++){
376 const int mb_xy= mb_x + mb_y*s->mb_stride;
377 int mv_predictor[8][2]={{0}};
378 int pred_count=0;
379 int j;
380 int best_score=256*256*256*64;
381 int best_pred=0;
382 const int mot_stride= s->b8_stride;
383 const int mot_index= mb_x*2 + mb_y*2*mot_stride;
384 int prev_x= s->current_picture.motion_val[0][mot_index][0];
385 int prev_y= s->current_picture.motion_val[0][mot_index][1];
386
387 if((mb_x^mb_y^pass)&1) continue;
388
389 if(fixed[mb_xy]==MV_FROZEN) continue;
390 assert(!IS_INTRA(s->current_picture.mb_type[mb_xy]));
391 assert(s->last_picture_ptr && s->last_picture_ptr->data[0]);
392
393 j=0;
394 if(mb_x>0 && fixed[mb_xy-1 ]==MV_FROZEN) j=1;
395 if(mb_x+1<mb_width && fixed[mb_xy+1 ]==MV_FROZEN) j=1;
396 if(mb_y>0 && fixed[mb_xy-mb_stride]==MV_FROZEN) j=1;
397 if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]==MV_FROZEN) j=1;
398 if(j==0) continue;
399
400 j=0;
401 if(mb_x>0 && fixed[mb_xy-1 ]==MV_CHANGED) j=1;
402 if(mb_x+1<mb_width && fixed[mb_xy+1 ]==MV_CHANGED) j=1;
403 if(mb_y>0 && fixed[mb_xy-mb_stride]==MV_CHANGED) j=1;
404 if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]==MV_CHANGED) j=1;
405 if(j==0 && pass>1) continue;
406
407 none_left=0;
408
409 if(mb_x>0 && fixed[mb_xy-1]){
410 mv_predictor[pred_count][0]= s->current_picture.motion_val[0][mot_index - 2][0];
411 mv_predictor[pred_count][1]= s->current_picture.motion_val[0][mot_index - 2][1];
412 pred_count++;
413 }
414 if(mb_x+1<mb_width && fixed[mb_xy+1]){
415 mv_predictor[pred_count][0]= s->current_picture.motion_val[0][mot_index + 2][0];
416 mv_predictor[pred_count][1]= s->current_picture.motion_val[0][mot_index + 2][1];
417 pred_count++;
418 }
419 if(mb_y>0 && fixed[mb_xy-mb_stride]){
420 mv_predictor[pred_count][0]= s->current_picture.motion_val[0][mot_index - mot_stride*2][0];
421 mv_predictor[pred_count][1]= s->current_picture.motion_val[0][mot_index - mot_stride*2][1];
422 pred_count++;
423 }
424 if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]){
425 mv_predictor[pred_count][0]= s->current_picture.motion_val[0][mot_index + mot_stride*2][0];
426 mv_predictor[pred_count][1]= s->current_picture.motion_val[0][mot_index + mot_stride*2][1];
427 pred_count++;
428 }
429 if(pred_count==0) continue;
430
431 if(pred_count>1){
432 int sum_x=0, sum_y=0;
433 int max_x, max_y, min_x, min_y;
434
435 for(j=0; j<pred_count; j++){
436 sum_x+= mv_predictor[j][0];
437 sum_y+= mv_predictor[j][1];
438 }
439
440 /* mean */
441 mv_predictor[pred_count][0] = sum_x/j;
442 mv_predictor[pred_count][1] = sum_y/j;
443
444 /* median */
445 if(pred_count>=3){
446 min_y= min_x= 99999;
447 max_y= max_x=-99999;
448 }else{
449 min_x=min_y=max_x=max_y=0;
450 }
451 for(j=0; j<pred_count; j++){
452 max_x= FFMAX(max_x, mv_predictor[j][0]);
453 max_y= FFMAX(max_y, mv_predictor[j][1]);
454 min_x= FFMIN(min_x, mv_predictor[j][0]);
455 min_y= FFMIN(min_y, mv_predictor[j][1]);
456 }
457 mv_predictor[pred_count+1][0] = sum_x - max_x - min_x;
458 mv_predictor[pred_count+1][1] = sum_y - max_y - min_y;
459
460 if(pred_count==4){
461 mv_predictor[pred_count+1][0] /= 2;
462 mv_predictor[pred_count+1][1] /= 2;
463 }
464 pred_count+=2;
465 }
466
467 /* zero MV */
468 pred_count++;
469
470 /* last MV */
471 mv_predictor[pred_count][0]= s->current_picture.motion_val[0][mot_index][0];
472 mv_predictor[pred_count][1]= s->current_picture.motion_val[0][mot_index][1];
473 pred_count++;
474
475 s->mv_dir = MV_DIR_FORWARD;
476 s->mb_intra=0;
477 s->mv_type = MV_TYPE_16X16;
478 s->mb_skipped=0;
479
480 s->dsp.clear_blocks(s->block[0]);
481
482 s->mb_x= mb_x;
483 s->mb_y= mb_y;
484
485 for(j=0; j<pred_count; j++){
486 int score=0;
487 uint8_t *src= s->current_picture.data[0] + mb_x*16 + mb_y*16*s->linesize;
488
489 s->current_picture.motion_val[0][mot_index][0]= s->mv[0][0][0]= mv_predictor[j][0];
490 s->current_picture.motion_val[0][mot_index][1]= s->mv[0][0][1]= mv_predictor[j][1];
491
492 decode_mb(s);
493
494 if(mb_x>0 && fixed[mb_xy-1]){
495 int k;
496 for(k=0; k<16; k++)
497 score += FFABS(src[k*s->linesize-1 ]-src[k*s->linesize ]);
498 }
499 if(mb_x+1<mb_width && fixed[mb_xy+1]){
500 int k;
501 for(k=0; k<16; k++)
502 score += FFABS(src[k*s->linesize+15]-src[k*s->linesize+16]);
503 }
504 if(mb_y>0 && fixed[mb_xy-mb_stride]){
505 int k;
506 for(k=0; k<16; k++)
507 score += FFABS(src[k-s->linesize ]-src[k ]);
508 }
509 if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]){
510 int k;
511 for(k=0; k<16; k++)
512 score += FFABS(src[k+s->linesize*15]-src[k+s->linesize*16]);
513 }
514
515 if(score <= best_score){ // <= will favor the last MV
516 best_score= score;
517 best_pred= j;
518 }
519 }
520 score_sum+= best_score;
521 //FIXME no need to set s->current_picture.motion_val[0][mot_index][0] explicit
522 s->current_picture.motion_val[0][mot_index][0]= s->mv[0][0][0]= mv_predictor[best_pred][0];
523 s->current_picture.motion_val[0][mot_index][1]= s->mv[0][0][1]= mv_predictor[best_pred][1];
524
525 decode_mb(s);
526
527
528 if(s->mv[0][0][0] != prev_x || s->mv[0][0][1] != prev_y){
529 fixed[mb_xy]=MV_CHANGED;
530 changed++;
531 }else
532 fixed[mb_xy]=MV_UNCHANGED;
533 }
534 }
535
536 // printf(".%d/%d", changed, score_sum); fflush(stdout);
537 }
538
539 if(none_left)
540 return;
541
542 for(i=0; i<s->mb_num; i++){
543 int mb_xy= s->mb_index2xy[i];
544 if(fixed[mb_xy])
545 fixed[mb_xy]=MV_FROZEN;
546 }
547 // printf(":"); fflush(stdout);
548 }
549 }
550
551 static int is_intra_more_likely(MpegEncContext *s){
552 int is_intra_likely, i, j, undamaged_count, skip_amount, mb_x, mb_y;
553
554 if(!s->last_picture_ptr || !s->last_picture_ptr->data[0]) return 1; //no previous frame available -> use spatial prediction
555
556 undamaged_count=0;
557 for(i=0; i<s->mb_num; i++){
558 const int mb_xy= s->mb_index2xy[i];
559 const int error= s->error_status_table[mb_xy];
560 if(!((error&DC_ERROR) && (error&MV_ERROR)))
561 undamaged_count++;
562 }
563
564 if(undamaged_count < 5) return 0; //almost all MBs damaged -> use temporal prediction
565
566 //prevent dsp.sad() check, that requires access to the image
567 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration && s->pict_type == FF_I_TYPE)
568 return 1;
569
570 skip_amount= FFMAX(undamaged_count/50, 1); //check only upto 50 MBs
571 is_intra_likely=0;
572
573 j=0;
574 for(mb_y= 0; mb_y<s->mb_height-1; mb_y++){
575 for(mb_x= 0; mb_x<s->mb_width; mb_x++){
576 int error;
577 const int mb_xy= mb_x + mb_y*s->mb_stride;
578
579 error= s->error_status_table[mb_xy];
580 if((error&DC_ERROR) && (error&MV_ERROR))
581 continue; //skip damaged
582
583 j++;
584 if((j%skip_amount) != 0) continue; //skip a few to speed things up
585
586 if(s->pict_type==FF_I_TYPE){
587 uint8_t *mb_ptr = s->current_picture.data[0] + mb_x*16 + mb_y*16*s->linesize;
588 uint8_t *last_mb_ptr= s->last_picture.data [0] + mb_x*16 + mb_y*16*s->linesize;
589
590 is_intra_likely += s->dsp.sad[0](NULL, last_mb_ptr, mb_ptr , s->linesize, 16);
591 is_intra_likely -= s->dsp.sad[0](NULL, last_mb_ptr, last_mb_ptr+s->linesize*16, s->linesize, 16);
592 }else{
593 if(IS_INTRA(s->current_picture.mb_type[mb_xy]))
594 is_intra_likely++;
595 else
596 is_intra_likely--;
597 }
598 }
599 }
600 //printf("is_intra_likely: %d type:%d\n", is_intra_likely, s->pict_type);
601 return is_intra_likely > 0;
602 }
603
604 void ff_er_frame_start(MpegEncContext *s){
605 if(!s->error_recognition) return;
606
607 memset(s->error_status_table, MV_ERROR|AC_ERROR|DC_ERROR|VP_START|AC_END|DC_END|MV_END, s->mb_stride*s->mb_height*sizeof(uint8_t));
608 s->error_count= 3*s->mb_num;
609 }
610
611 /**
612 * adds a slice.
613 * @param endx x component of the last macroblock, can be -1 for the last of the previous line
614 * @param status the status at the end (MV_END, AC_ERROR, ...), it is assumed that no earlier end or
615 * error of the same type occurred
616 */
617 void ff_er_add_slice(MpegEncContext *s, int startx, int starty, int endx, int endy, int status){
618 const int start_i= av_clip(startx + starty * s->mb_width , 0, s->mb_num-1);
619 const int end_i = av_clip(endx + endy * s->mb_width , 0, s->mb_num);
620 const int start_xy= s->mb_index2xy[start_i];
621 const int end_xy = s->mb_index2xy[end_i];
622 int mask= -1;
623
624 if(start_i > end_i || start_xy > end_xy){
625 av_log(s->avctx, AV_LOG_ERROR, "internal error, slice end before start\n");
626 return;
627 }
628
629 if(!s->error_recognition) return;
630
631 mask &= ~VP_START;
632 if(status & (AC_ERROR|AC_END)){
633 mask &= ~(AC_ERROR|AC_END);
634 s->error_count -= end_i - start_i + 1;
635 }
636 if(status & (DC_ERROR|DC_END)){
637 mask &= ~(DC_ERROR|DC_END);
638 s->error_count -= end_i - start_i + 1;
639 }
640 if(status & (MV_ERROR|MV_END)){
641 mask &= ~(MV_ERROR|MV_END);
642 s->error_count -= end_i - start_i + 1;
643 }
644
645 if(status & (AC_ERROR|DC_ERROR|MV_ERROR)) s->error_count= INT_MAX;
646
647 if(mask == ~0x7F){
648 memset(&s->error_status_table[start_xy], 0, (end_xy - start_xy) * sizeof(uint8_t));
649 }else{
650 int i;
651 for(i=start_xy; i<end_xy; i++){
652 s->error_status_table[ i ] &= mask;
653 }
654 }
655
656 if(end_i == s->mb_num)
657 s->error_count= INT_MAX;
658 else{
659 s->error_status_table[end_xy] &= mask;
660 s->error_status_table[end_xy] |= status;
661 }
662
663 s->error_status_table[start_xy] |= VP_START;
664
665 if(start_xy > 0 && s->avctx->thread_count <= 1 && s->avctx->skip_top*s->mb_width < start_i){
666 int prev_status= s->error_status_table[ s->mb_index2xy[start_i - 1] ];
667
668 prev_status &= ~ VP_START;
669 if(prev_status != (MV_END|DC_END|AC_END)) s->error_count= INT_MAX;
670 }
671 }
672
673 void ff_er_frame_end(MpegEncContext *s){
674 int i, mb_x, mb_y, error, error_type, dc_error, mv_error, ac_error;
675 int distance;
676 int threshold_part[4]= {100,100,100};
677 int threshold= 50;
678 int is_intra_likely;
679 int size = s->b8_stride * 2 * s->mb_height;
680 Picture *pic= s->current_picture_ptr;
681
682 if(!s->error_recognition || s->error_count==0 || s->avctx->lowres ||
683 s->avctx->hwaccel ||
684 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU ||
685 s->error_count==3*s->mb_width*(s->avctx->skip_top + s->avctx->skip_bottom)) return;
686
687 if(s->current_picture.motion_val[0] == NULL){
688 av_log(s->avctx, AV_LOG_ERROR, "Warning MVs not available\n");
689
690 for(i=0; i<2; i++){
691 pic->ref_index[i]= av_mallocz(size * sizeof(uint8_t));
692 pic->motion_val_base[i]= av_mallocz((size+4) * 2 * sizeof(uint16_t));
693 pic->motion_val[i]= pic->motion_val_base[i]+4;
694 }
695 pic->motion_subsample_log2= 3;
696 s->current_picture= *s->current_picture_ptr;
697 }
698
699 for(i=0; i<2; i++){
700 if(pic->ref_index[i])
701 memset(pic->ref_index[i], 0, size * sizeof(uint8_t));
702 }
703
704 if(s->avctx->debug&FF_DEBUG_ER){
705 for(mb_y=0; mb_y<s->mb_height; mb_y++){
706 for(mb_x=0; mb_x<s->mb_width; mb_x++){
707 int status= s->error_status_table[mb_x + mb_y*s->mb_stride];
708
709 av_log(s->avctx, AV_LOG_DEBUG, "%2X ", status);
710 }
711 av_log(s->avctx, AV_LOG_DEBUG, "\n");
712 }
713 }
714
715 #if 1
716 /* handle overlapping slices */
717 for(error_type=1; error_type<=3; error_type++){
718 int end_ok=0;
719
720 for(i=s->mb_num-1; i>=0; i--){
721 const int mb_xy= s->mb_index2xy[i];
722 int error= s->error_status_table[mb_xy];
723
724 if(error&(1<<error_type))
725 end_ok=1;
726 if(error&(8<<error_type))
727 end_ok=1;
728
729 if(!end_ok)
730 s->error_status_table[mb_xy]|= 1<<error_type;
731
732 if(error&VP_START)
733 end_ok=0;
734 }
735 }
736 #endif
737 #if 1
738 /* handle slices with partitions of different length */
739 if(s->partitioned_frame){
740 int end_ok=0;
741
742 for(i=s->mb_num-1; i>=0; i--){
743 const int mb_xy= s->mb_index2xy[i];
744 int error= s->error_status_table[mb_xy];
745
746 if(error&AC_END)
747 end_ok=0;
748 if((error&MV_END) || (error&DC_END) || (error&AC_ERROR))
749 end_ok=1;
750
751 if(!end_ok)
752 s->error_status_table[mb_xy]|= AC_ERROR;
753
754 if(error&VP_START)
755 end_ok=0;
756 }
757 }
758 #endif
759 /* handle missing slices */
760 if(s->error_recognition>=4){
761 int end_ok=1;
762
763 for(i=s->mb_num-2; i>=s->mb_width+100; i--){ //FIXME +100 hack
764 const int mb_xy= s->mb_index2xy[i];
765 int error1= s->error_status_table[mb_xy ];
766 int error2= s->error_status_table[s->mb_index2xy[i+1]];
767
768 if(error1&VP_START)
769 end_ok=1;
770
771 if( error2==(VP_START|DC_ERROR|AC_ERROR|MV_ERROR|AC_END|DC_END|MV_END)
772 && error1!=(VP_START|DC_ERROR|AC_ERROR|MV_ERROR|AC_END|DC_END|MV_END)
773 && ((error1&AC_END) || (error1&DC_END) || (error1&MV_END))){ //end & uninit
774 end_ok=0;
775 }
776
777 if(!end_ok)
778 s->error_status_table[mb_xy]|= DC_ERROR|AC_ERROR|MV_ERROR;
779 }
780 }
781
782 #if 1
783 /* backward mark errors */
784 distance=9999999;
785 for(error_type=1; error_type<=3; error_type++){
786 for(i=s->mb_num-1; i>=0; i--){
787 const int mb_xy= s->mb_index2xy[i];
788 int error= s->error_status_table[mb_xy];
789
790 if(!s->mbskip_table[mb_xy]) //FIXME partition specific
791 distance++;
792 if(error&(1<<error_type))
793 distance= 0;
794
795 if(s->partitioned_frame){
796 if(distance < threshold_part[error_type-1])
797 s->error_status_table[mb_xy]|= 1<<error_type;
798 }else{
799 if(distance < threshold)
800 s->error_status_table[mb_xy]|= 1<<error_type;
801 }
802
803 if(error&VP_START)
804 distance= 9999999;
805 }
806 }
807 #endif
808
809 /* forward mark errors */
810 error=0;
811 for(i=0; i<s->mb_num; i++){
812 const int mb_xy= s->mb_index2xy[i];
813 int old_error= s->error_status_table[mb_xy];
814
815 if(old_error&VP_START)
816 error= old_error& (DC_ERROR|AC_ERROR|MV_ERROR);
817 else{
818 error|= old_error& (DC_ERROR|AC_ERROR|MV_ERROR);
819 s->error_status_table[mb_xy]|= error;
820 }
821 }
822 #if 1
823 /* handle not partitioned case */
824 if(!s->partitioned_frame){
825 for(i=0; i<s->mb_num; i++){
826 const int mb_xy= s->mb_index2xy[i];
827 error= s->error_status_table[mb_xy];
828 if(error&(AC_ERROR|DC_ERROR|MV_ERROR))
829 error|= AC_ERROR|DC_ERROR|MV_ERROR;
830 s->error_status_table[mb_xy]= error;
831 }
832 }
833 #endif
834
835 dc_error= ac_error= mv_error=0;
836 for(i=0; i<s->mb_num; i++){
837 const int mb_xy= s->mb_index2xy[i];
838 error= s->error_status_table[mb_xy];
839 if(error&DC_ERROR) dc_error ++;
840 if(error&AC_ERROR) ac_error ++;
841 if(error&MV_ERROR) mv_error ++;
842 }
843 av_log(s->avctx, AV_LOG_INFO, "concealing %d DC, %d AC, %d MV errors\n", dc_error, ac_error, mv_error);
844
845 is_intra_likely= is_intra_more_likely(s);
846
847 /* set unknown mb-type to most likely */
848 for(i=0; i<s->mb_num; i++){
849 const int mb_xy= s->mb_index2xy[i];
850 error= s->error_status_table[mb_xy];
851 if(!((error&DC_ERROR) && (error&MV_ERROR)))
852 continue;
853
854 if(is_intra_likely)
855 s->current_picture.mb_type[mb_xy]= MB_TYPE_INTRA4x4;
856 else
857 s->current_picture.mb_type[mb_xy]= MB_TYPE_16x16 | MB_TYPE_L0;
858 }
859
860 /* handle inter blocks with damaged AC */
861 for(mb_y=0; mb_y<s->mb_height; mb_y++){
862 for(mb_x=0; mb_x<s->mb_width; mb_x++){
863 const int mb_xy= mb_x + mb_y * s->mb_stride;
864 const int mb_type= s->current_picture.mb_type[mb_xy];
865 error= s->error_status_table[mb_xy];
866
867 if(IS_INTRA(mb_type)) continue; //intra
868 if(error&MV_ERROR) continue; //inter with damaged MV
869 if(!(error&AC_ERROR)) continue; //undamaged inter
870
871 s->mv_dir = MV_DIR_FORWARD;
872 s->mb_intra=0;
873 s->mb_skipped=0;
874 if(IS_8X8(mb_type)){
875 int mb_index= mb_x*2 + mb_y*2*s->b8_stride;
876 int j;
877 s->mv_type = MV_TYPE_8X8;
878 for(j=0; j<4; j++){
879 s->mv[0][j][0] = s->current_picture.motion_val[0][ mb_index + (j&1) + (j>>1)*s->b8_stride ][0];
880 s->mv[0][j][1] = s->current_picture.motion_val[0][ mb_index + (j&1) + (j>>1)*s->b8_stride ][1];
881 }
882 }else{
883 s->mv_type = MV_TYPE_16X16;
884 s->mv[0][0][0] = s->current_picture.motion_val[0][ mb_x*2 + mb_y*2*s->b8_stride ][0];
885 s->mv[0][0][1] = s->current_picture.motion_val[0][ mb_x*2 + mb_y*2*s->b8_stride ][1];
886 }
887
888 s->dsp.clear_blocks(s->block[0]);
889
890 s->mb_x= mb_x;
891 s->mb_y= mb_y;
892 decode_mb(s);
893 }
894 }
895
896 /* guess MVs */
897 if(s->pict_type==FF_B_TYPE){
898 for(mb_y=0; mb_y<s->mb_height; mb_y++){
899 for(mb_x=0; mb_x<s->mb_width; mb_x++){
900 int xy= mb_x*2 + mb_y*2*s->b8_stride;
901 const int mb_xy= mb_x + mb_y * s->mb_stride;
902 const int mb_type= s->current_picture.mb_type[mb_xy];
903 error= s->error_status_table[mb_xy];
904
905 if(IS_INTRA(mb_type)) continue;
906 if(!(error&MV_ERROR)) continue; //inter with undamaged MV
907 if(!(error&AC_ERROR)) continue; //undamaged inter
908
909 s->mv_dir = MV_DIR_FORWARD|MV_DIR_BACKWARD;
910 s->mb_intra=0;
911 s->mv_type = MV_TYPE_16X16;
912 s->mb_skipped=0;
913
914 if(s->pp_time){
915 int time_pp= s->pp_time;
916 int time_pb= s->pb_time;
917
918 s->mv[0][0][0] = s->next_picture.motion_val[0][xy][0]*time_pb/time_pp;
919 s->mv[0][0][1] = s->next_picture.motion_val[0][xy][1]*time_pb/time_pp;
920 s->mv[1][0][0] = s->next_picture.motion_val[0][xy][0]*(time_pb - time_pp)/time_pp;
921 s->mv[1][0][1] = s->next_picture.motion_val[0][xy][1]*(time_pb - time_pp)/time_pp;
922 }else{
923 s->mv[0][0][0]= 0;
924 s->mv[0][0][1]= 0;
925 s->mv[1][0][0]= 0;
926 s->mv[1][0][1]= 0;
927 }
928
929 s->dsp.clear_blocks(s->block[0]);
930 s->mb_x= mb_x;
931 s->mb_y= mb_y;
932 decode_mb(s);
933 }
934 }
935 }else
936 guess_mv(s);
937
938 /* the filters below are not XvMC compatible, skip them */
939 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
940 goto ec_clean;
941 /* fill DC for inter blocks */
942 for(mb_y=0; mb_y<s->mb_height; mb_y++){
943 for(mb_x=0; mb_x<s->mb_width; mb_x++){
944 int dc, dcu, dcv, y, n;
945 int16_t *dc_ptr;
946 uint8_t *dest_y, *dest_cb, *dest_cr;
947 const int mb_xy= mb_x + mb_y * s->mb_stride;
948 const int mb_type= s->current_picture.mb_type[mb_xy];
949
950 error= s->error_status_table[mb_xy];
951
952 if(IS_INTRA(mb_type) && s->partitioned_frame) continue;
953 // if(error&MV_ERROR) continue; //inter data damaged FIXME is this good?
954
955 dest_y = s->current_picture.data[0] + mb_x*16 + mb_y*16*s->linesize;
956 dest_cb= s->current_picture.data[1] + mb_x*8 + mb_y*8 *s->uvlinesize;
957 dest_cr= s->current_picture.data[2] + mb_x*8 + mb_y*8 *s->uvlinesize;
958
959 dc_ptr= &s->dc_val[0][mb_x*2 + mb_y*2*s->b8_stride];
960 for(n=0; n<4; n++){
961 dc=0;
962 for(y=0; y<8; y++){
963 int x;
964 for(x=0; x<8; x++){
965 dc+= dest_y[x + (n&1)*8 + (y + (n>>1)*8)*s->linesize];
966 }
967 }
968 dc_ptr[(n&1) + (n>>1)*s->b8_stride]= (dc+4)>>3;
969 }
970
971 dcu=dcv=0;
972 for(y=0; y<8; y++){
973 int x;
974 for(x=0; x<8; x++){
975 dcu+=dest_cb[x + y*(s->uvlinesize)];
976 dcv+=dest_cr[x + y*(s->uvlinesize)];
977 }
978 }
979 s->dc_val[1][mb_x + mb_y*s->mb_stride]= (dcu+4)>>3;
980 s->dc_val[2][mb_x + mb_y*s->mb_stride]= (dcv+4)>>3;
981 }
982 }
983 #if 1
984 /* guess DC for damaged blocks */
985 guess_dc(s, s->dc_val[0], s->mb_width*2, s->mb_height*2, s->b8_stride, 1);
986 guess_dc(s, s->dc_val[1], s->mb_width , s->mb_height , s->mb_stride, 0);
987 guess_dc(s, s->dc_val[2], s->mb_width , s->mb_height , s->mb_stride, 0);
988 #endif
989 /* filter luma DC */
990 filter181(s->dc_val[0], s->mb_width*2, s->mb_height*2, s->b8_stride);
991
992 #if 1
993 /* render DC only intra */
994 for(mb_y=0; mb_y<s->mb_height; mb_y++){
995 for(mb_x=0; mb_x<s->mb_width; mb_x++){
996 uint8_t *dest_y, *dest_cb, *dest_cr;
997 const int mb_xy= mb_x + mb_y * s->mb_stride;
998 const int mb_type= s->current_picture.mb_type[mb_xy];
999
1000 error= s->error_status_table[mb_xy];
1001
1002 if(IS_INTER(mb_type)) continue;
1003 if(!(error&AC_ERROR)) continue; //undamaged
1004
1005 dest_y = s->current_picture.data[0] + mb_x*16 + mb_y*16*s->linesize;
1006 dest_cb= s->current_picture.data[1] + mb_x*8 + mb_y*8 *s->uvlinesize;
1007 dest_cr= s->current_picture.data[2] + mb_x*8 + mb_y*8 *s->uvlinesize;
1008
1009 put_dc(s, dest_y, dest_cb, dest_cr, mb_x, mb_y);
1010 }
1011 }
1012 #endif
1013
1014 if(s->avctx->error_concealment&FF_EC_DEBLOCK){
1015 /* filter horizontal block boundaries */
1016 h_block_filter(s, s->current_picture.data[0], s->mb_width*2, s->mb_height*2, s->linesize , 1);
1017 h_block_filter(s, s->current_picture.data[1], s->mb_width , s->mb_height , s->uvlinesize, 0);
1018 h_block_filter(s, s->current_picture.data[2], s->mb_width , s->mb_height , s->uvlinesize, 0);
1019
1020 /* filter vertical block boundaries */
1021 v_block_filter(s, s->current_picture.data[0], s->mb_width*2, s->mb_height*2, s->linesize , 1);
1022 v_block_filter(s, s->current_picture.data[1], s->mb_width , s->mb_height , s->uvlinesize, 0);
1023 v_block_filter(s, s->current_picture.data[2], s->mb_width , s->mb_height , s->uvlinesize, 0);
1024 }
1025
1026 ec_clean:
1027 /* clean a few tables */
1028 for(i=0; i<s->mb_num; i++){
1029 const int mb_xy= s->mb_index2xy[i];
1030 int error= s->error_status_table[mb_xy];
1031
1032 if(s->pict_type!=FF_B_TYPE && (error&(DC_ERROR|MV_ERROR|AC_ERROR))){
1033 s->mbskip_table[mb_xy]=0;
1034 }
1035 s->mbintra_table[mb_xy]=1;
1036 }
1037 }