cosmetics: drop some pointless parentheses
[ffmpeg.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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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
25  * Error resilience / concealment.
26  */
27
28 #include <limits.h>
29
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33 #include "h264.h"
34 #include "rectangle.h"
35 #include "thread.h"
36
37 /*
38  * H264 redefines mb_intra so it is not mistakely used (its uninitialized in h264)
39  * but error concealment must support both h264 and h263 thus we must undo this
40  */
41 #undef mb_intra
42
43 static void decode_mb(MpegEncContext *s, int ref){
44     s->dest[0] = s->current_picture.f.data[0] + (s->mb_y *  16 * s->linesize)                         + s->mb_x *  16;
45     s->dest[1] = s->current_picture.f.data[1] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
46     s->dest[2] = s->current_picture.f.data[2] + (s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize) + s->mb_x * (16 >> s->chroma_x_shift);
47
48     if(CONFIG_H264_DECODER && s->codec_id == CODEC_ID_H264){
49         H264Context *h= (void*)s;
50         h->mb_xy= s->mb_x + s->mb_y*s->mb_stride;
51         memset(h->non_zero_count_cache, 0, sizeof(h->non_zero_count_cache));
52         assert(ref>=0);
53         /* FIXME: It is posible albeit uncommon that slice references
54          * differ between slices. We take the easy approach and ignore
55          * it for now. If this turns out to have any relevance in
56          * practice then correct remapping should be added. */
57         if (ref >= h->ref_count[0])
58             ref=0;
59         fill_rectangle(&s->current_picture.f.ref_index[0][4*h->mb_xy], 2, 2, 2, ref, 1);
60         fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);
61         fill_rectangle(h->mv_cache[0][ scan8[0] ], 4, 4, 8, pack16to32(s->mv[0][0][0],s->mv[0][0][1]), 4);
62         assert(!FRAME_MBAFF);
63         ff_h264_hl_decode_mb(h);
64     }else{
65         assert(ref==0);
66     MPV_decode_mb(s, s->block);
67     }
68 }
69
70 /**
71  * @param stride the number of MVs to get to the next row
72  * @param mv_step the number of MVs per row or column in a macroblock
73  */
74 static void set_mv_strides(MpegEncContext *s, int *mv_step, int *stride){
75     if(s->codec_id == CODEC_ID_H264){
76         H264Context *h= (void*)s;
77         assert(s->quarter_sample);
78         *mv_step= 4;
79         *stride= h->b_stride;
80     }else{
81         *mv_step= 2;
82         *stride= s->b8_stride;
83     }
84 }
85
86 /**
87  * Replace the current MB with a flat dc-only version.
88  */
89 static void put_dc(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, int mb_x, int mb_y)
90 {
91     int dc, dcu, dcv, y, i;
92     for(i=0; i<4; i++){
93         dc= s->dc_val[0][mb_x*2 + (i&1) + (mb_y*2 + (i>>1))*s->b8_stride];
94         if(dc<0) dc=0;
95         else if(dc>2040) dc=2040;
96         for(y=0; y<8; y++){
97             int x;
98             for(x=0; x<8; x++){
99                 dest_y[x + (i&1)*8 + (y + (i>>1)*8)*s->linesize]= dc/8;
100             }
101         }
102     }
103     dcu = s->dc_val[1][mb_x + mb_y*s->mb_stride];
104     dcv = s->dc_val[2][mb_x + mb_y*s->mb_stride];
105     if     (dcu<0   ) dcu=0;
106     else if(dcu>2040) dcu=2040;
107     if     (dcv<0   ) dcv=0;
108     else if(dcv>2040) dcv=2040;
109     for(y=0; y<8; y++){
110         int x;
111         for(x=0; x<8; x++){
112             dest_cb[x + y * s->uvlinesize] = dcu / 8;
113             dest_cr[x + y * s->uvlinesize] = dcv / 8;
114         }
115     }
116 }
117
118 static void filter181(int16_t *data, int width, int height, int stride){
119     int x,y;
120
121     /* horizontal filter */
122     for(y=1; y<height-1; y++){
123         int prev_dc= data[0 + y*stride];
124
125         for(x=1; x<width-1; x++){
126             int dc;
127
128             dc= - prev_dc
129                 + data[x     + y*stride]*8
130                 - data[x + 1 + y*stride];
131             dc= (dc*10923 + 32768)>>16;
132             prev_dc= data[x + y*stride];
133             data[x + y*stride]= dc;
134         }
135     }
136
137     /* vertical filter */
138     for(x=1; x<width-1; x++){
139         int prev_dc= data[x];
140
141         for(y=1; y<height-1; y++){
142             int dc;
143
144             dc= - prev_dc
145                 + data[x +  y   *stride]*8
146                 - data[x + (y+1)*stride];
147             dc= (dc*10923 + 32768)>>16;
148             prev_dc= data[x + y*stride];
149             data[x + y*stride]= dc;
150         }
151     }
152 }
153
154 /**
155  * guess the dc of blocks which do not have an undamaged dc
156  * @param w     width in 8 pixel blocks
157  * @param h     height in 8 pixel blocks
158  */
159 static void guess_dc(MpegEncContext *s, int16_t *dc, int w, int h, int stride, int is_luma){
160     int b_x, b_y;
161
162     for(b_y=0; b_y<h; b_y++){
163         for(b_x=0; b_x<w; b_x++){
164             int color[4]={1024,1024,1024,1024};
165             int distance[4]={9999,9999,9999,9999};
166             int mb_index, error, j;
167             int64_t guess, weight_sum;
168
169             mb_index= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;
170
171             error= s->error_status_table[mb_index];
172
173             if(IS_INTER(s->current_picture.f.mb_type[mb_index])) continue; //inter
174             if(!(error&ER_DC_ERROR)) continue;           //dc-ok
175
176             /* right block */
177             for(j=b_x+1; j<w; j++){
178                 int mb_index_j= (j>>is_luma) + (b_y>>is_luma)*s->mb_stride;
179                 int error_j= s->error_status_table[mb_index_j];
180                 int intra_j = IS_INTRA(s->current_picture.f.mb_type[mb_index_j]);
181                 if(intra_j==0 || !(error_j&ER_DC_ERROR)){
182                     color[0]= dc[j + b_y*stride];
183                     distance[0]= j-b_x;
184                     break;
185                 }
186             }
187
188             /* left block */
189             for(j=b_x-1; j>=0; j--){
190                 int mb_index_j= (j>>is_luma) + (b_y>>is_luma)*s->mb_stride;
191                 int error_j= s->error_status_table[mb_index_j];
192                 int intra_j = IS_INTRA(s->current_picture.f.mb_type[mb_index_j]);
193                 if(intra_j==0 || !(error_j&ER_DC_ERROR)){
194                     color[1]= dc[j + b_y*stride];
195                     distance[1]= b_x-j;
196                     break;
197                 }
198             }
199
200             /* bottom block */
201             for(j=b_y+1; j<h; j++){
202                 int mb_index_j= (b_x>>is_luma) + (j>>is_luma)*s->mb_stride;
203                 int error_j= s->error_status_table[mb_index_j];
204                 int intra_j = IS_INTRA(s->current_picture.f.mb_type[mb_index_j]);
205                 if(intra_j==0 || !(error_j&ER_DC_ERROR)){
206                     color[2]= dc[b_x + j*stride];
207                     distance[2]= j-b_y;
208                     break;
209                 }
210             }
211
212             /* top block */
213             for(j=b_y-1; j>=0; j--){
214                 int mb_index_j= (b_x>>is_luma) + (j>>is_luma)*s->mb_stride;
215                 int error_j= s->error_status_table[mb_index_j];
216                 int intra_j = IS_INTRA(s->current_picture.f.mb_type[mb_index_j]);
217                 if(intra_j==0 || !(error_j&ER_DC_ERROR)){
218                     color[3]= dc[b_x + j*stride];
219                     distance[3]= b_y-j;
220                     break;
221                 }
222             }
223
224             weight_sum=0;
225             guess=0;
226             for(j=0; j<4; j++){
227                 int64_t weight= 256*256*256*16/distance[j];
228                 guess+= weight*(int64_t)color[j];
229                 weight_sum+= weight;
230             }
231             guess= (guess + weight_sum/2) / weight_sum;
232
233             dc[b_x + b_y*stride]= guess;
234         }
235     }
236 }
237
238 /**
239  * simple horizontal deblocking filter used for error resilience
240  * @param w     width in 8 pixel blocks
241  * @param h     height in 8 pixel blocks
242  */
243 static void h_block_filter(MpegEncContext *s, uint8_t *dst, int w, int h, int stride, int is_luma){
244     int b_x, b_y, mvx_stride, mvy_stride;
245     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
246     set_mv_strides(s, &mvx_stride, &mvy_stride);
247     mvx_stride >>= is_luma;
248     mvy_stride *= mvx_stride;
249
250     for(b_y=0; b_y<h; b_y++){
251         for(b_x=0; b_x<w-1; b_x++){
252             int y;
253             int left_status = s->error_status_table[( b_x   >>is_luma) + (b_y>>is_luma)*s->mb_stride];
254             int right_status= s->error_status_table[((b_x+1)>>is_luma) + (b_y>>is_luma)*s->mb_stride];
255             int left_intra  = IS_INTRA(s->current_picture.f.mb_type[( b_x      >> is_luma) + (b_y >> is_luma) * s->mb_stride]);
256             int right_intra = IS_INTRA(s->current_picture.f.mb_type[((b_x + 1) >> is_luma) + (b_y >> is_luma) * s->mb_stride]);
257             int left_damage =  left_status&ER_MB_ERROR;
258             int right_damage= right_status&ER_MB_ERROR;
259             int offset= b_x*8 + b_y*stride*8;
260             int16_t *left_mv=  s->current_picture.f.motion_val[0][mvy_stride*b_y + mvx_stride* b_x   ];
261             int16_t *right_mv= s->current_picture.f.motion_val[0][mvy_stride*b_y + mvx_stride*(b_x+1)];
262
263             if(!(left_damage||right_damage)) continue; // both undamaged
264
265             if(   (!left_intra) && (!right_intra)
266                && FFABS(left_mv[0]-right_mv[0]) + FFABS(left_mv[1]+right_mv[1]) < 2) continue;
267
268             for(y=0; y<8; y++){
269                 int a,b,c,d;
270
271                 a= dst[offset + 7 + y*stride] - dst[offset + 6 + y*stride];
272                 b= dst[offset + 8 + y*stride] - dst[offset + 7 + y*stride];
273                 c= dst[offset + 9 + y*stride] - dst[offset + 8 + y*stride];
274
275                 d= FFABS(b) - ((FFABS(a) + FFABS(c) + 1)>>1);
276                 d= FFMAX(d, 0);
277                 if(b<0) d= -d;
278
279                 if(d==0) continue;
280
281                 if(!(left_damage && right_damage))
282                     d= d*16/9;
283
284                 if(left_damage){
285                     dst[offset + 7 + y*stride] = cm[dst[offset + 7 + y*stride] + ((d*7)>>4)];
286                     dst[offset + 6 + y*stride] = cm[dst[offset + 6 + y*stride] + ((d*5)>>4)];
287                     dst[offset + 5 + y*stride] = cm[dst[offset + 5 + y*stride] + ((d*3)>>4)];
288                     dst[offset + 4 + y*stride] = cm[dst[offset + 4 + y*stride] + ((d*1)>>4)];
289                 }
290                 if(right_damage){
291                     dst[offset + 8 + y*stride] = cm[dst[offset + 8 + y*stride] - ((d*7)>>4)];
292                     dst[offset + 9 + y*stride] = cm[dst[offset + 9 + y*stride] - ((d*5)>>4)];
293                     dst[offset + 10+ y*stride] = cm[dst[offset +10 + y*stride] - ((d*3)>>4)];
294                     dst[offset + 11+ y*stride] = cm[dst[offset +11 + y*stride] - ((d*1)>>4)];
295                 }
296             }
297         }
298     }
299 }
300
301 /**
302  * simple vertical deblocking filter used for error resilience
303  * @param w     width in 8 pixel blocks
304  * @param h     height in 8 pixel blocks
305  */
306 static void v_block_filter(MpegEncContext *s, uint8_t *dst, int w, int h, int stride, int is_luma){
307     int b_x, b_y, mvx_stride, mvy_stride;
308     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
309     set_mv_strides(s, &mvx_stride, &mvy_stride);
310     mvx_stride >>= is_luma;
311     mvy_stride *= mvx_stride;
312
313     for(b_y=0; b_y<h-1; b_y++){
314         for(b_x=0; b_x<w; b_x++){
315             int x;
316             int top_status   = s->error_status_table[(b_x>>is_luma) + ( b_y   >>is_luma)*s->mb_stride];
317             int bottom_status= s->error_status_table[(b_x>>is_luma) + ((b_y+1)>>is_luma)*s->mb_stride];
318             int top_intra    = IS_INTRA(s->current_picture.f.mb_type[(b_x >> is_luma) + ( b_y      >> is_luma) * s->mb_stride]);
319             int bottom_intra = IS_INTRA(s->current_picture.f.mb_type[(b_x >> is_luma) + ((b_y + 1) >> is_luma) * s->mb_stride]);
320             int top_damage =      top_status&ER_MB_ERROR;
321             int bottom_damage= bottom_status&ER_MB_ERROR;
322             int offset= b_x*8 + b_y*stride*8;
323             int16_t *top_mv    = s->current_picture.f.motion_val[0][mvy_stride *  b_y      + mvx_stride * b_x];
324             int16_t *bottom_mv = s->current_picture.f.motion_val[0][mvy_stride * (b_y + 1) + mvx_stride * b_x];
325
326             if(!(top_damage||bottom_damage)) continue; // both undamaged
327
328             if(   (!top_intra) && (!bottom_intra)
329                && FFABS(top_mv[0]-bottom_mv[0]) + FFABS(top_mv[1]+bottom_mv[1]) < 2) continue;
330
331             for(x=0; x<8; x++){
332                 int a,b,c,d;
333
334                 a= dst[offset + x + 7*stride] - dst[offset + x + 6*stride];
335                 b= dst[offset + x + 8*stride] - dst[offset + x + 7*stride];
336                 c= dst[offset + x + 9*stride] - dst[offset + x + 8*stride];
337
338                 d= FFABS(b) - ((FFABS(a) + FFABS(c)+1)>>1);
339                 d= FFMAX(d, 0);
340                 if(b<0) d= -d;
341
342                 if(d==0) continue;
343
344                 if(!(top_damage && bottom_damage))
345                     d= d*16/9;
346
347                 if(top_damage){
348                     dst[offset + x +  7*stride] = cm[dst[offset + x +  7*stride] + ((d*7)>>4)];
349                     dst[offset + x +  6*stride] = cm[dst[offset + x +  6*stride] + ((d*5)>>4)];
350                     dst[offset + x +  5*stride] = cm[dst[offset + x +  5*stride] + ((d*3)>>4)];
351                     dst[offset + x +  4*stride] = cm[dst[offset + x +  4*stride] + ((d*1)>>4)];
352                 }
353                 if(bottom_damage){
354                     dst[offset + x +  8*stride] = cm[dst[offset + x +  8*stride] - ((d*7)>>4)];
355                     dst[offset + x +  9*stride] = cm[dst[offset + x +  9*stride] - ((d*5)>>4)];
356                     dst[offset + x + 10*stride] = cm[dst[offset + x + 10*stride] - ((d*3)>>4)];
357                     dst[offset + x + 11*stride] = cm[dst[offset + x + 11*stride] - ((d*1)>>4)];
358                 }
359             }
360         }
361     }
362 }
363
364 static void guess_mv(MpegEncContext *s){
365     uint8_t fixed[s->mb_stride * s->mb_height];
366 #define MV_FROZEN    3
367 #define MV_CHANGED   2
368 #define MV_UNCHANGED 1
369     const int mb_stride = s->mb_stride;
370     const int mb_width = s->mb_width;
371     const int mb_height= s->mb_height;
372     int i, depth, num_avail;
373     int mb_x, mb_y, mot_step, mot_stride;
374
375     set_mv_strides(s, &mot_step, &mot_stride);
376
377     num_avail=0;
378     for(i=0; i<s->mb_num; i++){
379         const int mb_xy= s->mb_index2xy[ i ];
380         int f=0;
381         int error= s->error_status_table[mb_xy];
382
383         if(IS_INTRA(s->current_picture.f.mb_type[mb_xy])) f=MV_FROZEN; //intra //FIXME check
384         if(!(error&ER_MV_ERROR)) f=MV_FROZEN;           //inter with undamaged MV
385
386         fixed[mb_xy]= f;
387         if(f==MV_FROZEN)
388             num_avail++;
389     }
390
391     if((!(s->avctx->error_concealment&FF_EC_GUESS_MVS)) || num_avail <= mb_width/2){
392         for(mb_y=0; mb_y<s->mb_height; mb_y++){
393             for(mb_x=0; mb_x<s->mb_width; mb_x++){
394                 const int mb_xy= mb_x + mb_y*s->mb_stride;
395
396                 if(IS_INTRA(s->current_picture.f.mb_type[mb_xy]))  continue;
397                 if(!(s->error_status_table[mb_xy]&ER_MV_ERROR)) continue;
398
399                 s->mv_dir = s->last_picture.f.data[0] ? MV_DIR_FORWARD : MV_DIR_BACKWARD;
400                 s->mb_intra=0;
401                 s->mv_type = MV_TYPE_16X16;
402                 s->mb_skipped=0;
403
404                 s->dsp.clear_blocks(s->block[0]);
405
406                 s->mb_x= mb_x;
407                 s->mb_y= mb_y;
408                 s->mv[0][0][0]= 0;
409                 s->mv[0][0][1]= 0;
410                 decode_mb(s, 0);
411             }
412         }
413         return;
414     }
415
416     for(depth=0;; depth++){
417         int changed, pass, none_left;
418
419         none_left=1;
420         changed=1;
421         for(pass=0; (changed || pass<2) && pass<10; pass++){
422             int mb_x, mb_y;
423 int score_sum=0;
424
425             changed=0;
426             for(mb_y=0; mb_y<s->mb_height; mb_y++){
427                 for(mb_x=0; mb_x<s->mb_width; mb_x++){
428                     const int mb_xy= mb_x + mb_y*s->mb_stride;
429                     int mv_predictor[8][2]={{0}};
430                     int ref[8]={0};
431                     int pred_count=0;
432                     int j;
433                     int best_score=256*256*256*64;
434                     int best_pred=0;
435                     const int mot_index= (mb_x + mb_y*mot_stride) * mot_step;
436                     int prev_x, prev_y, prev_ref;
437
438                     if((mb_x^mb_y^pass)&1) continue;
439
440                     if(fixed[mb_xy]==MV_FROZEN) continue;
441                     assert(!IS_INTRA(s->current_picture.f.mb_type[mb_xy]));
442                     assert(s->last_picture_ptr && s->last_picture_ptr->f.data[0]);
443
444                     j=0;
445                     if(mb_x>0           && fixed[mb_xy-1        ]==MV_FROZEN) j=1;
446                     if(mb_x+1<mb_width  && fixed[mb_xy+1        ]==MV_FROZEN) j=1;
447                     if(mb_y>0           && fixed[mb_xy-mb_stride]==MV_FROZEN) j=1;
448                     if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]==MV_FROZEN) j=1;
449                     if(j==0) continue;
450
451                     j=0;
452                     if(mb_x>0           && fixed[mb_xy-1        ]==MV_CHANGED) j=1;
453                     if(mb_x+1<mb_width  && fixed[mb_xy+1        ]==MV_CHANGED) j=1;
454                     if(mb_y>0           && fixed[mb_xy-mb_stride]==MV_CHANGED) j=1;
455                     if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]==MV_CHANGED) j=1;
456                     if(j==0 && pass>1) continue;
457
458                     none_left=0;
459
460                     if(mb_x>0 && fixed[mb_xy-1]){
461                         mv_predictor[pred_count][0]= s->current_picture.f.motion_val[0][mot_index - mot_step][0];
462                         mv_predictor[pred_count][1]= s->current_picture.f.motion_val[0][mot_index - mot_step][1];
463                         ref         [pred_count]   = s->current_picture.f.ref_index[0][4*(mb_xy-1)];
464                         pred_count++;
465                     }
466                     if(mb_x+1<mb_width && fixed[mb_xy+1]){
467                         mv_predictor[pred_count][0]= s->current_picture.f.motion_val[0][mot_index + mot_step][0];
468                         mv_predictor[pred_count][1]= s->current_picture.f.motion_val[0][mot_index + mot_step][1];
469                         ref         [pred_count]   = s->current_picture.f.ref_index[0][4*(mb_xy+1)];
470                         pred_count++;
471                     }
472                     if(mb_y>0 && fixed[mb_xy-mb_stride]){
473                         mv_predictor[pred_count][0]= s->current_picture.f.motion_val[0][mot_index - mot_stride*mot_step][0];
474                         mv_predictor[pred_count][1]= s->current_picture.f.motion_val[0][mot_index - mot_stride*mot_step][1];
475                         ref         [pred_count]   = s->current_picture.f.ref_index[0][4*(mb_xy-s->mb_stride)];
476                         pred_count++;
477                     }
478                     if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]){
479                         mv_predictor[pred_count][0]= s->current_picture.f.motion_val[0][mot_index + mot_stride*mot_step][0];
480                         mv_predictor[pred_count][1]= s->current_picture.f.motion_val[0][mot_index + mot_stride*mot_step][1];
481                         ref         [pred_count]   = s->current_picture.f.ref_index[0][4*(mb_xy+s->mb_stride)];
482                         pred_count++;
483                     }
484                     if(pred_count==0) continue;
485
486                     if(pred_count>1){
487                         int sum_x=0, sum_y=0, sum_r=0;
488                         int max_x, max_y, min_x, min_y, max_r, min_r;
489
490                         for(j=0; j<pred_count; j++){
491                             sum_x+= mv_predictor[j][0];
492                             sum_y+= mv_predictor[j][1];
493                             sum_r+= ref[j];
494                             if(j && ref[j] != ref[j-1])
495                                 goto skip_mean_and_median;
496                         }
497
498                         /* mean */
499                         mv_predictor[pred_count][0] = sum_x/j;
500                         mv_predictor[pred_count][1] = sum_y/j;
501                         ref         [pred_count]    = sum_r/j;
502
503                         /* median */
504                         if(pred_count>=3){
505                             min_y= min_x= min_r= 99999;
506                             max_y= max_x= max_r=-99999;
507                         }else{
508                             min_x=min_y=max_x=max_y=min_r=max_r=0;
509                         }
510                         for(j=0; j<pred_count; j++){
511                             max_x= FFMAX(max_x, mv_predictor[j][0]);
512                             max_y= FFMAX(max_y, mv_predictor[j][1]);
513                             max_r= FFMAX(max_r, ref[j]);
514                             min_x= FFMIN(min_x, mv_predictor[j][0]);
515                             min_y= FFMIN(min_y, mv_predictor[j][1]);
516                             min_r= FFMIN(min_r, ref[j]);
517                         }
518                         mv_predictor[pred_count+1][0] = sum_x - max_x - min_x;
519                         mv_predictor[pred_count+1][1] = sum_y - max_y - min_y;
520                         ref         [pred_count+1]    = sum_r - max_r - min_r;
521
522                         if(pred_count==4){
523                             mv_predictor[pred_count+1][0] /= 2;
524                             mv_predictor[pred_count+1][1] /= 2;
525                             ref         [pred_count+1]    /= 2;
526                         }
527                         pred_count+=2;
528                     }
529 skip_mean_and_median:
530
531                     /* zero MV */
532                     pred_count++;
533
534                     if (!fixed[mb_xy]) {
535                         if (s->avctx->codec_id == CODEC_ID_H264) {
536                             // FIXME
537                         } else {
538                             ff_thread_await_progress((AVFrame *) s->last_picture_ptr,
539                                                      mb_y, 0);
540                         }
541                         if (!s->last_picture.f.motion_val[0] ||
542                             !s->last_picture.f.ref_index[0])
543                             goto skip_last_mv;
544                         prev_x = s->last_picture.f.motion_val[0][mot_index][0];
545                         prev_y = s->last_picture.f.motion_val[0][mot_index][1];
546                         prev_ref = s->last_picture.f.ref_index[0][4*mb_xy];
547                     } else {
548                         prev_x = s->current_picture.f.motion_val[0][mot_index][0];
549                         prev_y = s->current_picture.f.motion_val[0][mot_index][1];
550                         prev_ref = s->current_picture.f.ref_index[0][4*mb_xy];
551                     }
552
553                     /* last MV */
554                     mv_predictor[pred_count][0]= prev_x;
555                     mv_predictor[pred_count][1]= prev_y;
556                     ref         [pred_count]   = prev_ref;
557                     pred_count++;
558                 skip_last_mv:
559
560                     s->mv_dir = MV_DIR_FORWARD;
561                     s->mb_intra=0;
562                     s->mv_type = MV_TYPE_16X16;
563                     s->mb_skipped=0;
564
565                     s->dsp.clear_blocks(s->block[0]);
566
567                     s->mb_x= mb_x;
568                     s->mb_y= mb_y;
569
570                     for(j=0; j<pred_count; j++){
571                         int score=0;
572                         uint8_t *src = s->current_picture.f.data[0] + mb_x*16 + mb_y*16*s->linesize;
573
574                         s->current_picture.f.motion_val[0][mot_index][0] = s->mv[0][0][0] = mv_predictor[j][0];
575                         s->current_picture.f.motion_val[0][mot_index][1] = s->mv[0][0][1] = mv_predictor[j][1];
576
577                         if(ref[j]<0) //predictor intra or otherwise not available
578                             continue;
579
580                         decode_mb(s, ref[j]);
581
582                         if(mb_x>0 && fixed[mb_xy-1]){
583                             int k;
584                             for(k=0; k<16; k++)
585                                 score += FFABS(src[k*s->linesize-1 ]-src[k*s->linesize   ]);
586                         }
587                         if(mb_x+1<mb_width && fixed[mb_xy+1]){
588                             int k;
589                             for(k=0; k<16; k++)
590                                 score += FFABS(src[k*s->linesize+15]-src[k*s->linesize+16]);
591                         }
592                         if(mb_y>0 && fixed[mb_xy-mb_stride]){
593                             int k;
594                             for(k=0; k<16; k++)
595                                 score += FFABS(src[k-s->linesize   ]-src[k               ]);
596                         }
597                         if(mb_y+1<mb_height && fixed[mb_xy+mb_stride]){
598                             int k;
599                             for(k=0; k<16; k++)
600                                 score += FFABS(src[k+s->linesize*15]-src[k+s->linesize*16]);
601                         }
602
603                         if(score <= best_score){ // <= will favor the last MV
604                             best_score= score;
605                             best_pred= j;
606                         }
607                     }
608 score_sum+= best_score;
609                     s->mv[0][0][0]= mv_predictor[best_pred][0];
610                     s->mv[0][0][1]= mv_predictor[best_pred][1];
611
612                     for(i=0; i<mot_step; i++)
613                         for(j=0; j<mot_step; j++){
614                             s->current_picture.f.motion_val[0][mot_index + i + j * mot_stride][0] = s->mv[0][0][0];
615                             s->current_picture.f.motion_val[0][mot_index + i + j * mot_stride][1] = s->mv[0][0][1];
616                         }
617
618                     decode_mb(s, ref[best_pred]);
619
620
621                     if(s->mv[0][0][0] != prev_x || s->mv[0][0][1] != prev_y){
622                         fixed[mb_xy]=MV_CHANGED;
623                         changed++;
624                     }else
625                         fixed[mb_xy]=MV_UNCHANGED;
626                 }
627             }
628
629 //            printf(".%d/%d", changed, score_sum); fflush(stdout);
630         }
631
632         if(none_left)
633             return;
634
635         for(i=0; i<s->mb_num; i++){
636             int mb_xy= s->mb_index2xy[i];
637             if(fixed[mb_xy])
638                 fixed[mb_xy]=MV_FROZEN;
639         }
640 //        printf(":"); fflush(stdout);
641     }
642 }
643
644 static int is_intra_more_likely(MpegEncContext *s){
645     int is_intra_likely, i, j, undamaged_count, skip_amount, mb_x, mb_y;
646
647     if (!s->last_picture_ptr || !s->last_picture_ptr->f.data[0]) return 1; //no previous frame available -> use spatial prediction
648
649     undamaged_count=0;
650     for(i=0; i<s->mb_num; i++){
651         const int mb_xy= s->mb_index2xy[i];
652         const int error= s->error_status_table[mb_xy];
653         if(!((error&ER_DC_ERROR) && (error&ER_MV_ERROR)))
654             undamaged_count++;
655     }
656
657     if(s->codec_id == CODEC_ID_H264){
658         H264Context *h= (void*)s;
659         if (h->list_count <= 0 || h->ref_count[0] <= 0 || !h->ref_list[0][0].f.data[0])
660             return 1;
661     }
662
663     if(undamaged_count < 5) return 0; //almost all MBs damaged -> use temporal prediction
664
665     //prevent dsp.sad() check, that requires access to the image
666     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration && s->pict_type == AV_PICTURE_TYPE_I)
667         return 1;
668
669     skip_amount = FFMAX(undamaged_count / 50, 1); // check only up to 50 MBs
670     is_intra_likely=0;
671
672     j=0;
673     for(mb_y= 0; mb_y<s->mb_height-1; mb_y++){
674         for(mb_x= 0; mb_x<s->mb_width; mb_x++){
675             int error;
676             const int mb_xy= mb_x + mb_y*s->mb_stride;
677
678             error= s->error_status_table[mb_xy];
679             if((error&ER_DC_ERROR) && (error&ER_MV_ERROR))
680                 continue; //skip damaged
681
682             j++;
683             if((j%skip_amount) != 0) continue; //skip a few to speed things up
684
685             if(s->pict_type==AV_PICTURE_TYPE_I){
686                 uint8_t *mb_ptr     = s->current_picture.f.data[0] + mb_x*16 + mb_y*16*s->linesize;
687                 uint8_t *last_mb_ptr= s->last_picture.f.data   [0] + mb_x*16 + mb_y*16*s->linesize;
688
689                 if (s->avctx->codec_id == CODEC_ID_H264) {
690                     // FIXME
691                 } else {
692                     ff_thread_await_progress((AVFrame *) s->last_picture_ptr,
693                                              mb_y, 0);
694                 }
695                 is_intra_likely += s->dsp.sad[0](NULL, last_mb_ptr, mb_ptr                    , s->linesize, 16);
696                 is_intra_likely -= s->dsp.sad[0](NULL, last_mb_ptr, last_mb_ptr+s->linesize*16, s->linesize, 16);
697             }else{
698                 if (IS_INTRA(s->current_picture.f.mb_type[mb_xy]))
699                    is_intra_likely++;
700                 else
701                    is_intra_likely--;
702             }
703         }
704     }
705 //printf("is_intra_likely: %d type:%d\n", is_intra_likely, s->pict_type);
706     return is_intra_likely > 0;
707 }
708
709 void ff_er_frame_start(MpegEncContext *s){
710     if(!s->err_recognition) return;
711
712     memset(s->error_status_table, ER_MB_ERROR|VP_START|ER_MB_END, s->mb_stride*s->mb_height*sizeof(uint8_t));
713     s->error_count= 3*s->mb_num;
714     s->error_occurred = 0;
715 }
716
717 /**
718  * Add a slice.
719  * @param endx x component of the last macroblock, can be -1 for the last of the previous line
720  * @param status the status at the end (ER_MV_END, ER_AC_ERROR, ...), it is assumed that no earlier end or
721  *               error of the same type occurred
722  */
723 void ff_er_add_slice(MpegEncContext *s, int startx, int starty, int endx, int endy, int status){
724     const int start_i= av_clip(startx + starty * s->mb_width    , 0, s->mb_num-1);
725     const int end_i  = av_clip(endx   + endy   * s->mb_width    , 0, s->mb_num);
726     const int start_xy= s->mb_index2xy[start_i];
727     const int end_xy  = s->mb_index2xy[end_i];
728     int mask= -1;
729
730     if(s->avctx->hwaccel)
731         return;
732
733     if(start_i > end_i || start_xy > end_xy){
734         av_log(s->avctx, AV_LOG_ERROR, "internal error, slice end before start\n");
735         return;
736     }
737
738     if(!s->err_recognition) return;
739
740     mask &= ~VP_START;
741     if(status & (ER_AC_ERROR|ER_AC_END)){
742         mask &= ~(ER_AC_ERROR|ER_AC_END);
743         s->error_count -= end_i - start_i + 1;
744     }
745     if(status & (ER_DC_ERROR|ER_DC_END)){
746         mask &= ~(ER_DC_ERROR|ER_DC_END);
747         s->error_count -= end_i - start_i + 1;
748     }
749     if(status & (ER_MV_ERROR|ER_MV_END)){
750         mask &= ~(ER_MV_ERROR|ER_MV_END);
751         s->error_count -= end_i - start_i + 1;
752     }
753
754     if(status & ER_MB_ERROR) {
755         s->error_occurred = 1;
756         s->error_count= INT_MAX;
757     }
758
759     if(mask == ~0x7F){
760         memset(&s->error_status_table[start_xy], 0, (end_xy - start_xy) * sizeof(uint8_t));
761     }else{
762         int i;
763         for(i=start_xy; i<end_xy; i++){
764             s->error_status_table[ i ] &= mask;
765         }
766     }
767
768     if(end_i == s->mb_num)
769         s->error_count= INT_MAX;
770     else{
771         s->error_status_table[end_xy] &= mask;
772         s->error_status_table[end_xy] |= status;
773     }
774
775     s->error_status_table[start_xy] |= VP_START;
776
777     if(start_xy > 0 && s->avctx->thread_count <= 1 && s->avctx->skip_top*s->mb_width < start_i){
778         int prev_status= s->error_status_table[ s->mb_index2xy[start_i - 1] ];
779
780         prev_status &= ~ VP_START;
781         if(prev_status != (ER_MV_END|ER_DC_END|ER_AC_END)) s->error_count= INT_MAX;
782     }
783 }
784
785 void ff_er_frame_end(MpegEncContext *s){
786     int i, mb_x, mb_y, error, error_type, dc_error, mv_error, ac_error;
787     int distance;
788     int threshold_part[4]= {100,100,100};
789     int threshold= 50;
790     int is_intra_likely;
791     int size = s->b8_stride * 2 * s->mb_height;
792     Picture *pic= s->current_picture_ptr;
793
794     if(!s->err_recognition || s->error_count==0 || s->avctx->lowres ||
795        s->avctx->hwaccel ||
796        s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU ||
797        s->picture_structure != PICT_FRAME || // we do not support ER of field pictures yet, though it should not crash if enabled
798        s->error_count==3*s->mb_width*(s->avctx->skip_top + s->avctx->skip_bottom)) return;
799
800     if (s->current_picture.f.motion_val[0] == NULL) {
801         av_log(s->avctx, AV_LOG_ERROR, "Warning MVs not available\n");
802
803         for(i=0; i<2; i++){
804             pic->f.ref_index[i] = av_mallocz(s->mb_stride * s->mb_height * 4 * sizeof(uint8_t));
805             pic->motion_val_base[i]= av_mallocz((size+4) * 2 * sizeof(uint16_t));
806             pic->f.motion_val[i] = pic->motion_val_base[i] + 4;
807         }
808         pic->f.motion_subsample_log2 = 3;
809         s->current_picture= *s->current_picture_ptr;
810     }
811
812     if(s->avctx->debug&FF_DEBUG_ER){
813         for(mb_y=0; mb_y<s->mb_height; mb_y++){
814             for(mb_x=0; mb_x<s->mb_width; mb_x++){
815                 int status= s->error_status_table[mb_x + mb_y*s->mb_stride];
816
817                 av_log(s->avctx, AV_LOG_DEBUG, "%2X ", status);
818             }
819             av_log(s->avctx, AV_LOG_DEBUG, "\n");
820         }
821     }
822
823     /* handle overlapping slices */
824     for(error_type=1; error_type<=3; error_type++){
825         int end_ok=0;
826
827         for(i=s->mb_num-1; i>=0; i--){
828             const int mb_xy= s->mb_index2xy[i];
829             int error= s->error_status_table[mb_xy];
830
831             if(error&(1<<error_type))
832                 end_ok=1;
833             if(error&(8<<error_type))
834                 end_ok=1;
835
836             if(!end_ok)
837                 s->error_status_table[mb_xy]|= 1<<error_type;
838
839             if(error&VP_START)
840                 end_ok=0;
841         }
842     }
843
844     /* handle slices with partitions of different length */
845     if(s->partitioned_frame){
846         int end_ok=0;
847
848         for(i=s->mb_num-1; i>=0; i--){
849             const int mb_xy= s->mb_index2xy[i];
850             int error= s->error_status_table[mb_xy];
851
852             if(error&ER_AC_END)
853                 end_ok=0;
854             if((error&ER_MV_END) || (error&ER_DC_END) || (error&ER_AC_ERROR))
855                 end_ok=1;
856
857             if(!end_ok)
858                 s->error_status_table[mb_xy]|= ER_AC_ERROR;
859
860             if(error&VP_START)
861                 end_ok=0;
862         }
863     }
864
865     /* handle missing slices */
866     if(s->err_recognition&AV_EF_EXPLODE){
867         int end_ok=1;
868
869         for(i=s->mb_num-2; i>=s->mb_width+100; i--){ //FIXME +100 hack
870             const int mb_xy= s->mb_index2xy[i];
871             int error1= s->error_status_table[mb_xy  ];
872             int error2= s->error_status_table[s->mb_index2xy[i+1]];
873
874             if(error1&VP_START)
875                 end_ok=1;
876
877             if(   error2==(VP_START|ER_MB_ERROR|ER_MB_END)
878                && error1!=(VP_START|ER_MB_ERROR|ER_MB_END)
879                && ((error1&ER_AC_END) || (error1&ER_DC_END) || (error1&ER_MV_END))){ //end & uninit
880                 end_ok=0;
881             }
882
883             if(!end_ok)
884                 s->error_status_table[mb_xy]|= ER_MB_ERROR;
885         }
886     }
887
888     /* backward mark errors */
889     distance=9999999;
890     for(error_type=1; error_type<=3; error_type++){
891         for(i=s->mb_num-1; i>=0; i--){
892             const int mb_xy= s->mb_index2xy[i];
893             int error= s->error_status_table[mb_xy];
894
895             if(!s->mbskip_table[mb_xy]) //FIXME partition specific
896                 distance++;
897             if(error&(1<<error_type))
898                 distance= 0;
899
900             if(s->partitioned_frame){
901                 if(distance < threshold_part[error_type-1])
902                     s->error_status_table[mb_xy]|= 1<<error_type;
903             }else{
904                 if(distance < threshold)
905                     s->error_status_table[mb_xy]|= 1<<error_type;
906             }
907
908             if(error&VP_START)
909                 distance= 9999999;
910         }
911     }
912
913     /* forward mark errors */
914     error=0;
915     for(i=0; i<s->mb_num; i++){
916         const int mb_xy= s->mb_index2xy[i];
917         int old_error= s->error_status_table[mb_xy];
918
919         if(old_error&VP_START)
920             error= old_error& ER_MB_ERROR;
921         else{
922             error|= old_error& ER_MB_ERROR;
923             s->error_status_table[mb_xy]|= error;
924         }
925     }
926
927     /* handle not partitioned case */
928     if(!s->partitioned_frame){
929         for(i=0; i<s->mb_num; i++){
930             const int mb_xy= s->mb_index2xy[i];
931             error= s->error_status_table[mb_xy];
932             if(error&ER_MB_ERROR)
933                 error|= ER_MB_ERROR;
934             s->error_status_table[mb_xy]= error;
935         }
936     }
937
938     dc_error= ac_error= mv_error=0;
939     for(i=0; i<s->mb_num; i++){
940         const int mb_xy= s->mb_index2xy[i];
941         error= s->error_status_table[mb_xy];
942         if(error&ER_DC_ERROR) dc_error ++;
943         if(error&ER_AC_ERROR) ac_error ++;
944         if(error&ER_MV_ERROR) mv_error ++;
945     }
946     av_log(s->avctx, AV_LOG_INFO, "concealing %d DC, %d AC, %d MV errors\n", dc_error, ac_error, mv_error);
947
948     is_intra_likely= is_intra_more_likely(s);
949
950     /* set unknown mb-type to most likely */
951     for(i=0; i<s->mb_num; i++){
952         const int mb_xy= s->mb_index2xy[i];
953         error= s->error_status_table[mb_xy];
954         if(!((error&ER_DC_ERROR) && (error&ER_MV_ERROR)))
955             continue;
956
957         if(is_intra_likely)
958             s->current_picture.f.mb_type[mb_xy] = MB_TYPE_INTRA4x4;
959         else
960             s->current_picture.f.mb_type[mb_xy] = MB_TYPE_16x16 | MB_TYPE_L0;
961     }
962
963     // change inter to intra blocks if no reference frames are available
964     if (!s->last_picture.f.data[0] && !s->next_picture.f.data[0])
965         for(i=0; i<s->mb_num; i++){
966             const int mb_xy= s->mb_index2xy[i];
967             if (!IS_INTRA(s->current_picture.f.mb_type[mb_xy]))
968                 s->current_picture.f.mb_type[mb_xy] = MB_TYPE_INTRA4x4;
969         }
970
971     /* handle inter blocks with damaged AC */
972     for(mb_y=0; mb_y<s->mb_height; mb_y++){
973         for(mb_x=0; mb_x<s->mb_width; mb_x++){
974             const int mb_xy= mb_x + mb_y * s->mb_stride;
975             const int mb_type= s->current_picture.f.mb_type[mb_xy];
976             int dir = !s->last_picture.f.data[0];
977             error= s->error_status_table[mb_xy];
978
979             if(IS_INTRA(mb_type)) continue; //intra
980             if(error&ER_MV_ERROR) continue;              //inter with damaged MV
981             if(!(error&ER_AC_ERROR)) continue;           //undamaged inter
982
983             s->mv_dir = dir ? MV_DIR_BACKWARD : MV_DIR_FORWARD;
984             s->mb_intra=0;
985             s->mb_skipped=0;
986             if(IS_8X8(mb_type)){
987                 int mb_index= mb_x*2 + mb_y*2*s->b8_stride;
988                 int j;
989                 s->mv_type = MV_TYPE_8X8;
990                 for(j=0; j<4; j++){
991                     s->mv[0][j][0] = s->current_picture.f.motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][0];
992                     s->mv[0][j][1] = s->current_picture.f.motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][1];
993                 }
994             }else{
995                 s->mv_type = MV_TYPE_16X16;
996                 s->mv[0][0][0] = s->current_picture.f.motion_val[dir][ mb_x*2 + mb_y*2*s->b8_stride ][0];
997                 s->mv[0][0][1] = s->current_picture.f.motion_val[dir][ mb_x*2 + mb_y*2*s->b8_stride ][1];
998             }
999
1000             s->dsp.clear_blocks(s->block[0]);
1001
1002             s->mb_x= mb_x;
1003             s->mb_y= mb_y;
1004             decode_mb(s, 0/*FIXME h264 partitioned slices need this set*/);
1005         }
1006     }
1007
1008     /* guess MVs */
1009     if(s->pict_type==AV_PICTURE_TYPE_B){
1010         for(mb_y=0; mb_y<s->mb_height; mb_y++){
1011             for(mb_x=0; mb_x<s->mb_width; mb_x++){
1012                 int xy= mb_x*2 + mb_y*2*s->b8_stride;
1013                 const int mb_xy= mb_x + mb_y * s->mb_stride;
1014                 const int mb_type= s->current_picture.f.mb_type[mb_xy];
1015                 error= s->error_status_table[mb_xy];
1016
1017                 if(IS_INTRA(mb_type)) continue;
1018                 if(!(error&ER_MV_ERROR)) continue;           //inter with undamaged MV
1019                 if(!(error&ER_AC_ERROR)) continue;           //undamaged inter
1020
1021                 s->mv_dir = MV_DIR_FORWARD|MV_DIR_BACKWARD;
1022                 if(!s->last_picture.f.data[0]) s->mv_dir &= ~MV_DIR_FORWARD;
1023                 if(!s->next_picture.f.data[0]) s->mv_dir &= ~MV_DIR_BACKWARD;
1024                 s->mb_intra=0;
1025                 s->mv_type = MV_TYPE_16X16;
1026                 s->mb_skipped=0;
1027
1028                 if(s->pp_time){
1029                     int time_pp= s->pp_time;
1030                     int time_pb= s->pb_time;
1031
1032                     if (s->avctx->codec_id == CODEC_ID_H264) {
1033                         //FIXME
1034                     } else {
1035                         ff_thread_await_progress((AVFrame *) s->next_picture_ptr,
1036                                                  mb_y, 0);
1037                     }
1038                     s->mv[0][0][0] = s->next_picture.f.motion_val[0][xy][0] *            time_pb  / time_pp;
1039                     s->mv[0][0][1] = s->next_picture.f.motion_val[0][xy][1] *            time_pb  / time_pp;
1040                     s->mv[1][0][0] = s->next_picture.f.motion_val[0][xy][0] * (time_pb - time_pp) / time_pp;
1041                     s->mv[1][0][1] = s->next_picture.f.motion_val[0][xy][1] * (time_pb - time_pp) / time_pp;
1042                 }else{
1043                     s->mv[0][0][0]= 0;
1044                     s->mv[0][0][1]= 0;
1045                     s->mv[1][0][0]= 0;
1046                     s->mv[1][0][1]= 0;
1047                 }
1048
1049                 s->dsp.clear_blocks(s->block[0]);
1050                 s->mb_x= mb_x;
1051                 s->mb_y= mb_y;
1052                 decode_mb(s, 0);
1053             }
1054         }
1055     }else
1056         guess_mv(s);
1057
1058     /* the filters below are not XvMC compatible, skip them */
1059     if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1060         goto ec_clean;
1061     /* fill DC for inter blocks */
1062     for(mb_y=0; mb_y<s->mb_height; mb_y++){
1063         for(mb_x=0; mb_x<s->mb_width; mb_x++){
1064             int dc, dcu, dcv, y, n;
1065             int16_t *dc_ptr;
1066             uint8_t *dest_y, *dest_cb, *dest_cr;
1067             const int mb_xy= mb_x + mb_y * s->mb_stride;
1068             const int mb_type = s->current_picture.f.mb_type[mb_xy];
1069
1070             error= s->error_status_table[mb_xy];
1071
1072             if(IS_INTRA(mb_type) && s->partitioned_frame) continue;
1073 //            if(error&ER_MV_ERROR) continue; //inter data damaged FIXME is this good?
1074
1075             dest_y  = s->current_picture.f.data[0] + mb_x * 16 + mb_y * 16 * s->linesize;
1076             dest_cb = s->current_picture.f.data[1] + mb_x *  8 + mb_y *  8 * s->uvlinesize;
1077             dest_cr = s->current_picture.f.data[2] + mb_x *  8 + mb_y *  8 * s->uvlinesize;
1078
1079             dc_ptr= &s->dc_val[0][mb_x*2 + mb_y*2*s->b8_stride];
1080             for(n=0; n<4; n++){
1081                 dc=0;
1082                 for(y=0; y<8; y++){
1083                     int x;
1084                     for(x=0; x<8; x++){
1085                        dc+= dest_y[x + (n&1)*8 + (y + (n>>1)*8)*s->linesize];
1086                     }
1087                 }
1088                 dc_ptr[(n&1) + (n>>1)*s->b8_stride]= (dc+4)>>3;
1089             }
1090
1091             dcu=dcv=0;
1092             for(y=0; y<8; y++){
1093                 int x;
1094                 for(x=0; x<8; x++){
1095                     dcu += dest_cb[x + y * s->uvlinesize];
1096                     dcv += dest_cr[x + y * s->uvlinesize];
1097                 }
1098             }
1099             s->dc_val[1][mb_x + mb_y*s->mb_stride]= (dcu+4)>>3;
1100             s->dc_val[2][mb_x + mb_y*s->mb_stride]= (dcv+4)>>3;
1101         }
1102     }
1103
1104     /* guess DC for damaged blocks */
1105     guess_dc(s, s->dc_val[0], s->mb_width*2, s->mb_height*2, s->b8_stride, 1);
1106     guess_dc(s, s->dc_val[1], s->mb_width  , s->mb_height  , s->mb_stride, 0);
1107     guess_dc(s, s->dc_val[2], s->mb_width  , s->mb_height  , s->mb_stride, 0);
1108
1109     /* filter luma DC */
1110     filter181(s->dc_val[0], s->mb_width*2, s->mb_height*2, s->b8_stride);
1111
1112     /* render DC only intra */
1113     for(mb_y=0; mb_y<s->mb_height; mb_y++){
1114         for(mb_x=0; mb_x<s->mb_width; mb_x++){
1115             uint8_t *dest_y, *dest_cb, *dest_cr;
1116             const int mb_xy= mb_x + mb_y * s->mb_stride;
1117             const int mb_type = s->current_picture.f.mb_type[mb_xy];
1118
1119             error= s->error_status_table[mb_xy];
1120
1121             if(IS_INTER(mb_type)) continue;
1122             if(!(error&ER_AC_ERROR)) continue;              //undamaged
1123
1124             dest_y  = s->current_picture.f.data[0] + mb_x * 16 + mb_y * 16 * s->linesize;
1125             dest_cb = s->current_picture.f.data[1] + mb_x *  8 + mb_y *  8 * s->uvlinesize;
1126             dest_cr = s->current_picture.f.data[2] + mb_x *  8 + mb_y *  8 * s->uvlinesize;
1127
1128             put_dc(s, dest_y, dest_cb, dest_cr, mb_x, mb_y);
1129         }
1130     }
1131
1132     if(s->avctx->error_concealment&FF_EC_DEBLOCK){
1133         /* filter horizontal block boundaries */
1134         h_block_filter(s, s->current_picture.f.data[0], s->mb_width*2, s->mb_height*2, s->linesize  , 1);
1135         h_block_filter(s, s->current_picture.f.data[1], s->mb_width  , s->mb_height  , s->uvlinesize, 0);
1136         h_block_filter(s, s->current_picture.f.data[2], s->mb_width  , s->mb_height  , s->uvlinesize, 0);
1137
1138         /* filter vertical block boundaries */
1139         v_block_filter(s, s->current_picture.f.data[0], s->mb_width*2, s->mb_height*2, s->linesize  , 1);
1140         v_block_filter(s, s->current_picture.f.data[1], s->mb_width  , s->mb_height  , s->uvlinesize, 0);
1141         v_block_filter(s, s->current_picture.f.data[2], s->mb_width  , s->mb_height  , s->uvlinesize, 0);
1142     }
1143
1144 ec_clean:
1145     /* clean a few tables */
1146     for(i=0; i<s->mb_num; i++){
1147         const int mb_xy= s->mb_index2xy[i];
1148         int error= s->error_status_table[mb_xy];
1149
1150         if(s->pict_type!=AV_PICTURE_TYPE_B && (error&(ER_DC_ERROR|ER_MV_ERROR|ER_AC_ERROR))){
1151             s->mbskip_table[mb_xy]=0;
1152         }
1153         s->mbintra_table[mb_xy]=1;
1154     }
1155 }