FFmpeg
error_resilience.c
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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
25  * Error resilience / concealment.
26  */
27 
28 #include <limits.h>
29 
30 #include "libavutil/internal.h"
31 #include "avcodec.h"
32 #include "error_resilience.h"
33 #include "me_cmp.h"
34 #include "mpegutils.h"
35 #include "mpegvideo.h"
36 #include "rectangle.h"
37 #include "thread.h"
38 
39 /**
40  * @param stride the number of MVs to get to the next row
41  * @param mv_step the number of MVs per row or column in a macroblock
42  */
43 static void set_mv_strides(ERContext *s, ptrdiff_t *mv_step, ptrdiff_t *stride)
44 {
45  if (s->avctx->codec_id == AV_CODEC_ID_H264) {
46  av_assert0(s->quarter_sample);
47  *mv_step = 4;
48  *stride = s->mb_width * 4;
49  } else {
50  *mv_step = 2;
51  *stride = s->b8_stride;
52  }
53 }
54 
55 /**
56  * Replace the current MB with a flat dc-only version.
57  */
58 static void put_dc(ERContext *s, uint8_t *dest_y, uint8_t *dest_cb,
59  uint8_t *dest_cr, int mb_x, int mb_y)
60 {
61  int *linesize = s->cur_pic.f->linesize;
62  int dc, dcu, dcv, y, i;
63  for (i = 0; i < 4; i++) {
64  dc = s->dc_val[0][mb_x * 2 + (i & 1) + (mb_y * 2 + (i >> 1)) * s->b8_stride];
65  if (dc < 0)
66  dc = 0;
67  else if (dc > 2040)
68  dc = 2040;
69  for (y = 0; y < 8; y++) {
70  int x;
71  for (x = 0; x < 8; x++)
72  dest_y[x + (i & 1) * 8 + (y + (i >> 1) * 8) * linesize[0]] = dc / 8;
73  }
74  }
75  dcu = s->dc_val[1][mb_x + mb_y * s->mb_stride];
76  dcv = s->dc_val[2][mb_x + mb_y * s->mb_stride];
77  if (dcu < 0)
78  dcu = 0;
79  else if (dcu > 2040)
80  dcu = 2040;
81  if (dcv < 0)
82  dcv = 0;
83  else if (dcv > 2040)
84  dcv = 2040;
85 
86  if (dest_cr)
87  for (y = 0; y < 8; y++) {
88  int x;
89  for (x = 0; x < 8; x++) {
90  dest_cb[x + y * linesize[1]] = dcu / 8;
91  dest_cr[x + y * linesize[2]] = dcv / 8;
92  }
93  }
94 }
95 
96 static void filter181(int16_t *data, int width, int height, ptrdiff_t stride)
97 {
98  int x, y;
99 
100  /* horizontal filter */
101  for (y = 1; y < height - 1; y++) {
102  int prev_dc = data[0 + y * stride];
103 
104  for (x = 1; x < width - 1; x++) {
105  int dc;
106  dc = -prev_dc +
107  data[x + y * stride] * 8 -
108  data[x + 1 + y * stride];
109  dc = (av_clip(dc, INT_MIN/10923, INT_MAX/10923 - 32768) * 10923 + 32768) >> 16;
110  prev_dc = data[x + y * stride];
111  data[x + y * stride] = dc;
112  }
113  }
114 
115  /* vertical filter */
116  for (x = 1; x < width - 1; x++) {
117  int prev_dc = data[x];
118 
119  for (y = 1; y < height - 1; y++) {
120  int dc;
121 
122  dc = -prev_dc +
123  data[x + y * stride] * 8 -
124  data[x + (y + 1) * stride];
125  dc = (av_clip(dc, INT_MIN/10923, INT_MAX/10923 - 32768) * 10923 + 32768) >> 16;
126  prev_dc = data[x + y * stride];
127  data[x + y * stride] = dc;
128  }
129  }
130 }
131 
132 /**
133  * guess the dc of blocks which do not have an undamaged dc
134  * @param w width in 8 pixel blocks
135  * @param h height in 8 pixel blocks
136  */
137 static void guess_dc(ERContext *s, int16_t *dc, int w,
138  int h, ptrdiff_t stride, int is_luma)
139 {
140  int b_x, b_y;
141  int16_t (*col )[4] = av_malloc_array(stride, h*sizeof( int16_t)*4);
142  uint32_t (*dist)[4] = av_malloc_array(stride, h*sizeof(uint32_t)*4);
143 
144  if(!col || !dist) {
145  av_log(s->avctx, AV_LOG_ERROR, "guess_dc() is out of memory\n");
146  goto fail;
147  }
148 
149  for(b_y=0; b_y<h; b_y++){
150  int color= 1024;
151  int distance= -1;
152  for(b_x=0; b_x<w; b_x++){
153  int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;
154  int error_j= s->error_status_table[mb_index_j];
155  int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);
156  if(intra_j==0 || !(error_j&ER_DC_ERROR)){
157  color= dc[b_x + b_y*stride];
158  distance= b_x;
159  }
160  col [b_x + b_y*stride][1]= color;
161  dist[b_x + b_y*stride][1]= distance >= 0 ? b_x-distance : 9999;
162  }
163  color= 1024;
164  distance= -1;
165  for(b_x=w-1; b_x>=0; b_x--){
166  int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;
167  int error_j= s->error_status_table[mb_index_j];
168  int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);
169  if(intra_j==0 || !(error_j&ER_DC_ERROR)){
170  color= dc[b_x + b_y*stride];
171  distance= b_x;
172  }
173  col [b_x + b_y*stride][0]= color;
174  dist[b_x + b_y*stride][0]= distance >= 0 ? distance-b_x : 9999;
175  }
176  }
177  for(b_x=0; b_x<w; b_x++){
178  int color= 1024;
179  int distance= -1;
180  for(b_y=0; b_y<h; b_y++){
181  int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;
182  int error_j= s->error_status_table[mb_index_j];
183  int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);
184  if(intra_j==0 || !(error_j&ER_DC_ERROR)){
185  color= dc[b_x + b_y*stride];
186  distance= b_y;
187  }
188  col [b_x + b_y*stride][3]= color;
189  dist[b_x + b_y*stride][3]= distance >= 0 ? b_y-distance : 9999;
190  }
191  color= 1024;
192  distance= -1;
193  for(b_y=h-1; b_y>=0; b_y--){
194  int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;
195  int error_j= s->error_status_table[mb_index_j];
196  int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);
197  if(intra_j==0 || !(error_j&ER_DC_ERROR)){
198  color= dc[b_x + b_y*stride];
199  distance= b_y;
200  }
201  col [b_x + b_y*stride][2]= color;
202  dist[b_x + b_y*stride][2]= distance >= 0 ? distance-b_y : 9999;
203  }
204  }
205 
206  for (b_y = 0; b_y < h; b_y++) {
207  for (b_x = 0; b_x < w; b_x++) {
208  int mb_index, error, j;
209  int64_t guess, weight_sum;
210  mb_index = (b_x >> is_luma) + (b_y >> is_luma) * s->mb_stride;
211  error = s->error_status_table[mb_index];
212 
213  if (IS_INTER(s->cur_pic.mb_type[mb_index]))
214  continue; // inter
215  if (!(error & ER_DC_ERROR))
216  continue; // dc-ok
217 
218  weight_sum = 0;
219  guess = 0;
220  for (j = 0; j < 4; j++) {
221  int64_t weight = 256 * 256 * 256 * 16 / FFMAX(dist[b_x + b_y*stride][j], 1);
222  guess += weight*(int64_t)col[b_x + b_y*stride][j];
223  weight_sum += weight;
224  }
225  guess = (guess + weight_sum / 2) / weight_sum;
226  dc[b_x + b_y * stride] = guess;
227  }
228  }
229 
230 fail:
231  av_freep(&col);
232  av_freep(&dist);
233 }
234 
235 /**
236  * simple horizontal deblocking filter used for error resilience
237  * @param w width in 8 pixel blocks
238  * @param h height in 8 pixel blocks
239  */
240 static void h_block_filter(ERContext *s, uint8_t *dst, int w,
241  int h, ptrdiff_t stride, int is_luma)
242 {
243  int b_x, b_y;
244  ptrdiff_t mvx_stride, mvy_stride;
245  const uint8_t *cm = ff_crop_tab + 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->cur_pic.mb_type[( b_x >> is_luma) + (b_y >> is_luma) * s->mb_stride]);
256  int right_intra = IS_INTRA(s->cur_pic.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->cur_pic.motion_val[0][mvy_stride * b_y + mvx_stride * b_x];
261  int16_t *right_mv = s->cur_pic.motion_val[0][mvy_stride * b_y + mvx_stride * (b_x + 1)];
262  if (!(left_damage || right_damage))
263  continue; // both undamaged
264  if ((!left_intra) && (!right_intra) &&
265  FFABS(left_mv[0] - right_mv[0]) +
266  FFABS(left_mv[1] + right_mv[1]) < 2)
267  continue;
268 
269  for (y = 0; y < 8; y++) {
270  int a, b, c, d;
271 
272  a = dst[offset + 7 + y * stride] - dst[offset + 6 + y * stride];
273  b = dst[offset + 8 + y * stride] - dst[offset + 7 + y * stride];
274  c = dst[offset + 9 + y * stride] - dst[offset + 8 + y * stride];
275 
276  d = FFABS(b) - ((FFABS(a) + FFABS(c) + 1) >> 1);
277  d = FFMAX(d, 0);
278  if (b < 0)
279  d = -d;
280 
281  if (d == 0)
282  continue;
283 
284  if (!(left_damage && right_damage))
285  d = d * 16 / 9;
286 
287  if (left_damage) {
288  dst[offset + 7 + y * stride] = cm[dst[offset + 7 + y * stride] + ((d * 7) >> 4)];
289  dst[offset + 6 + y * stride] = cm[dst[offset + 6 + y * stride] + ((d * 5) >> 4)];
290  dst[offset + 5 + y * stride] = cm[dst[offset + 5 + y * stride] + ((d * 3) >> 4)];
291  dst[offset + 4 + y * stride] = cm[dst[offset + 4 + y * stride] + ((d * 1) >> 4)];
292  }
293  if (right_damage) {
294  dst[offset + 8 + y * stride] = cm[dst[offset + 8 + y * stride] - ((d * 7) >> 4)];
295  dst[offset + 9 + y * stride] = cm[dst[offset + 9 + y * stride] - ((d * 5) >> 4)];
296  dst[offset + 10+ y * stride] = cm[dst[offset + 10 + y * stride] - ((d * 3) >> 4)];
297  dst[offset + 11+ y * stride] = cm[dst[offset + 11 + y * stride] - ((d * 1) >> 4)];
298  }
299  }
300  }
301  }
302 }
303 
304 /**
305  * simple vertical deblocking filter used for error resilience
306  * @param w width in 8 pixel blocks
307  * @param h height in 8 pixel blocks
308  */
309 static void v_block_filter(ERContext *s, uint8_t *dst, int w, int h,
310  ptrdiff_t stride, int is_luma)
311 {
312  int b_x, b_y;
313  ptrdiff_t mvx_stride, mvy_stride;
314  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
315  set_mv_strides(s, &mvx_stride, &mvy_stride);
316  mvx_stride >>= is_luma;
317  mvy_stride *= mvx_stride;
318 
319  for (b_y = 0; b_y < h - 1; b_y++) {
320  for (b_x = 0; b_x < w; b_x++) {
321  int x;
322  int top_status = s->error_status_table[(b_x >> is_luma) + (b_y >> is_luma) * s->mb_stride];
323  int bottom_status = s->error_status_table[(b_x >> is_luma) + ((b_y + 1) >> is_luma) * s->mb_stride];
324  int top_intra = IS_INTRA(s->cur_pic.mb_type[(b_x >> is_luma) + ( b_y >> is_luma) * s->mb_stride]);
325  int bottom_intra = IS_INTRA(s->cur_pic.mb_type[(b_x >> is_luma) + ((b_y + 1) >> is_luma) * s->mb_stride]);
326  int top_damage = top_status & ER_MB_ERROR;
327  int bottom_damage = bottom_status & ER_MB_ERROR;
328  int offset = b_x * 8 + b_y * stride * 8;
329 
330  int16_t *top_mv = s->cur_pic.motion_val[0][mvy_stride * b_y + mvx_stride * b_x];
331  int16_t *bottom_mv = s->cur_pic.motion_val[0][mvy_stride * (b_y + 1) + mvx_stride * b_x];
332 
333  if (!(top_damage || bottom_damage))
334  continue; // both undamaged
335 
336  if ((!top_intra) && (!bottom_intra) &&
337  FFABS(top_mv[0] - bottom_mv[0]) +
338  FFABS(top_mv[1] + bottom_mv[1]) < 2)
339  continue;
340 
341  for (x = 0; x < 8; x++) {
342  int a, b, c, d;
343 
344  a = dst[offset + x + 7 * stride] - dst[offset + x + 6 * stride];
345  b = dst[offset + x + 8 * stride] - dst[offset + x + 7 * stride];
346  c = dst[offset + x + 9 * stride] - dst[offset + x + 8 * stride];
347 
348  d = FFABS(b) - ((FFABS(a) + FFABS(c) + 1) >> 1);
349  d = FFMAX(d, 0);
350  if (b < 0)
351  d = -d;
352 
353  if (d == 0)
354  continue;
355 
356  if (!(top_damage && bottom_damage))
357  d = d * 16 / 9;
358 
359  if (top_damage) {
360  dst[offset + x + 7 * stride] = cm[dst[offset + x + 7 * stride] + ((d * 7) >> 4)];
361  dst[offset + x + 6 * stride] = cm[dst[offset + x + 6 * stride] + ((d * 5) >> 4)];
362  dst[offset + x + 5 * stride] = cm[dst[offset + x + 5 * stride] + ((d * 3) >> 4)];
363  dst[offset + x + 4 * stride] = cm[dst[offset + x + 4 * stride] + ((d * 1) >> 4)];
364  }
365  if (bottom_damage) {
366  dst[offset + x + 8 * stride] = cm[dst[offset + x + 8 * stride] - ((d * 7) >> 4)];
367  dst[offset + x + 9 * stride] = cm[dst[offset + x + 9 * stride] - ((d * 5) >> 4)];
368  dst[offset + x + 10 * stride] = cm[dst[offset + x + 10 * stride] - ((d * 3) >> 4)];
369  dst[offset + x + 11 * stride] = cm[dst[offset + x + 11 * stride] - ((d * 1) >> 4)];
370  }
371  }
372  }
373  }
374 }
375 
376 #define MV_FROZEN 8
377 #define MV_CHANGED 4
378 #define MV_UNCHANGED 2
379 #define MV_LISTED 1
380 static av_always_inline void add_blocklist(int (*blocklist)[2], int *blocklist_length, uint8_t *fixed, int mb_x, int mb_y, int mb_xy)
381 {
382  if (fixed[mb_xy])
383  return;
384  fixed[mb_xy] = MV_LISTED;
385  blocklist[ *blocklist_length ][0] = mb_x;
386  blocklist[(*blocklist_length)++][1] = mb_y;
387 }
388 
389 static void guess_mv(ERContext *s)
390 {
391  int (*blocklist)[2], (*next_blocklist)[2];
392  uint8_t *fixed;
393  const ptrdiff_t mb_stride = s->mb_stride;
394  const int mb_width = s->mb_width;
395  int mb_height = s->mb_height;
396  int i, depth, num_avail;
397  int mb_x, mb_y;
398  ptrdiff_t mot_step, mot_stride;
399  int blocklist_length, next_blocklist_length;
400 
401  if (s->last_pic.f && s->last_pic.f->data[0])
402  mb_height = FFMIN(mb_height, (s->last_pic.f->height+15)>>4);
403  if (s->next_pic.f && s->next_pic.f->data[0])
404  mb_height = FFMIN(mb_height, (s->next_pic.f->height+15)>>4);
405 
406  blocklist = (int (*)[2])s->er_temp_buffer;
407  next_blocklist = blocklist + s->mb_stride * s->mb_height;
408  fixed = (uint8_t *)(next_blocklist + s->mb_stride * s->mb_height);
409 
410  set_mv_strides(s, &mot_step, &mot_stride);
411 
412  num_avail = 0;
413  if (s->last_pic.motion_val[0])
414  ff_thread_await_progress(s->last_pic.tf, mb_height-1, 0);
415  for (i = 0; i < mb_width * mb_height; i++) {
416  const int mb_xy = s->mb_index2xy[i];
417  int f = 0;
418  int error = s->error_status_table[mb_xy];
419 
420  if (IS_INTRA(s->cur_pic.mb_type[mb_xy]))
421  f = MV_FROZEN; // intra // FIXME check
422  if (!(error & ER_MV_ERROR))
423  f = MV_FROZEN; // inter with undamaged MV
424 
425  fixed[mb_xy] = f;
426  if (f == MV_FROZEN)
427  num_avail++;
428  else if(s->last_pic.f->data[0] && s->last_pic.motion_val[0]){
429  const int mb_y= mb_xy / s->mb_stride;
430  const int mb_x= mb_xy % s->mb_stride;
431  const int mot_index= (mb_x + mb_y*mot_stride) * mot_step;
432  s->cur_pic.motion_val[0][mot_index][0]= s->last_pic.motion_val[0][mot_index][0];
433  s->cur_pic.motion_val[0][mot_index][1]= s->last_pic.motion_val[0][mot_index][1];
434  s->cur_pic.ref_index[0][4*mb_xy] = s->last_pic.ref_index[0][4*mb_xy];
435  }
436  }
437 
438  if ((!(s->avctx->error_concealment&FF_EC_GUESS_MVS)) ||
439  num_avail <= FFMAX(mb_width, mb_height) / 2) {
440  for (mb_y = 0; mb_y < mb_height; mb_y++) {
441  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
442  const int mb_xy = mb_x + mb_y * s->mb_stride;
443  int mv_dir = (s->last_pic.f && s->last_pic.f->data[0]) ? MV_DIR_FORWARD : MV_DIR_BACKWARD;
444 
445  if (IS_INTRA(s->cur_pic.mb_type[mb_xy]))
446  continue;
447  if (!(s->error_status_table[mb_xy] & ER_MV_ERROR))
448  continue;
449 
450  s->mv[0][0][0] = 0;
451  s->mv[0][0][1] = 0;
452  s->decode_mb(s->opaque, 0, mv_dir, MV_TYPE_16X16, &s->mv,
453  mb_x, mb_y, 0, 0);
454  }
455  }
456  return;
457  }
458 
459  blocklist_length = 0;
460  for (mb_y = 0; mb_y < mb_height; mb_y++) {
461  for (mb_x = 0; mb_x < mb_width; mb_x++) {
462  const int mb_xy = mb_x + mb_y * mb_stride;
463  if (fixed[mb_xy] == MV_FROZEN) {
464  if (mb_x) add_blocklist(blocklist, &blocklist_length, fixed, mb_x - 1, mb_y, mb_xy - 1);
465  if (mb_y) add_blocklist(blocklist, &blocklist_length, fixed, mb_x, mb_y - 1, mb_xy - mb_stride);
466  if (mb_x+1 < mb_width) add_blocklist(blocklist, &blocklist_length, fixed, mb_x + 1, mb_y, mb_xy + 1);
467  if (mb_y+1 < mb_height) add_blocklist(blocklist, &blocklist_length, fixed, mb_x, mb_y + 1, mb_xy + mb_stride);
468  }
469  }
470  }
471 
472  for (depth = 0; ; depth++) {
473  int changed, pass, none_left;
474  int blocklist_index;
475 
476  none_left = 1;
477  changed = 1;
478  for (pass = 0; (changed || pass < 2) && pass < 10; pass++) {
479  changed = 0;
480  for (blocklist_index = 0; blocklist_index < blocklist_length; blocklist_index++) {
481  const int mb_x = blocklist[blocklist_index][0];
482  const int mb_y = blocklist[blocklist_index][1];
483  const int mb_xy = mb_x + mb_y * mb_stride;
484  int mv_predictor[8][2];
485  int ref[8];
486  int pred_count;
487  int j;
488  int best_score;
489  int best_pred;
490  int mot_index;
491  int prev_x, prev_y, prev_ref;
492 
493  if ((mb_x ^ mb_y ^ pass) & 1)
494  continue;
495  av_assert2(fixed[mb_xy] != MV_FROZEN);
496 
497 
498  av_assert1(!IS_INTRA(s->cur_pic.mb_type[mb_xy]));
499  av_assert1(s->last_pic.f && s->last_pic.f->data[0]);
500 
501  j = 0;
502  if (mb_x > 0)
503  j |= fixed[mb_xy - 1];
504  if (mb_x + 1 < mb_width)
505  j |= fixed[mb_xy + 1];
506  if (mb_y > 0)
507  j |= fixed[mb_xy - mb_stride];
508  if (mb_y + 1 < mb_height)
509  j |= fixed[mb_xy + mb_stride];
510 
511  av_assert2(j & MV_FROZEN);
512 
513  if (!(j & MV_CHANGED) && pass > 1)
514  continue;
515 
516  none_left = 0;
517  pred_count = 0;
518  mot_index = (mb_x + mb_y * mot_stride) * mot_step;
519 
520  if (mb_x > 0 && fixed[mb_xy - 1] > 1) {
521  mv_predictor[pred_count][0] =
522  s->cur_pic.motion_val[0][mot_index - mot_step][0];
523  mv_predictor[pred_count][1] =
524  s->cur_pic.motion_val[0][mot_index - mot_step][1];
525  ref[pred_count] =
526  s->cur_pic.ref_index[0][4 * (mb_xy - 1)];
527  pred_count++;
528  }
529  if (mb_x + 1 < mb_width && fixed[mb_xy + 1] > 1) {
530  mv_predictor[pred_count][0] =
531  s->cur_pic.motion_val[0][mot_index + mot_step][0];
532  mv_predictor[pred_count][1] =
533  s->cur_pic.motion_val[0][mot_index + mot_step][1];
534  ref[pred_count] =
535  s->cur_pic.ref_index[0][4 * (mb_xy + 1)];
536  pred_count++;
537  }
538  if (mb_y > 0 && fixed[mb_xy - mb_stride] > 1) {
539  mv_predictor[pred_count][0] =
540  s->cur_pic.motion_val[0][mot_index - mot_stride * mot_step][0];
541  mv_predictor[pred_count][1] =
542  s->cur_pic.motion_val[0][mot_index - mot_stride * mot_step][1];
543  ref[pred_count] =
544  s->cur_pic.ref_index[0][4 * (mb_xy - s->mb_stride)];
545  pred_count++;
546  }
547  if (mb_y + 1<mb_height && fixed[mb_xy + mb_stride] > 1) {
548  mv_predictor[pred_count][0] =
549  s->cur_pic.motion_val[0][mot_index + mot_stride * mot_step][0];
550  mv_predictor[pred_count][1] =
551  s->cur_pic.motion_val[0][mot_index + mot_stride * mot_step][1];
552  ref[pred_count] =
553  s->cur_pic.ref_index[0][4 * (mb_xy + s->mb_stride)];
554  pred_count++;
555  }
556  if (pred_count == 0)
557  continue;
558 
559  if (pred_count > 1) {
560  int sum_x = 0, sum_y = 0, sum_r = 0;
561  int max_x, max_y, min_x, min_y, max_r, min_r;
562 
563  for (j = 0; j < pred_count; j++) {
564  sum_x += mv_predictor[j][0];
565  sum_y += mv_predictor[j][1];
566  sum_r += ref[j];
567  if (j && ref[j] != ref[j - 1])
568  goto skip_mean_and_median;
569  }
570 
571  /* mean */
572  mv_predictor[pred_count][0] = sum_x / j;
573  mv_predictor[pred_count][1] = sum_y / j;
574  ref[pred_count] = sum_r / j;
575 
576  /* median */
577  if (pred_count >= 3) {
578  min_y = min_x = min_r = 99999;
579  max_y = max_x = max_r = -99999;
580  } else {
581  min_x = min_y = max_x = max_y = min_r = max_r = 0;
582  }
583  for (j = 0; j < pred_count; j++) {
584  max_x = FFMAX(max_x, mv_predictor[j][0]);
585  max_y = FFMAX(max_y, mv_predictor[j][1]);
586  max_r = FFMAX(max_r, ref[j]);
587  min_x = FFMIN(min_x, mv_predictor[j][0]);
588  min_y = FFMIN(min_y, mv_predictor[j][1]);
589  min_r = FFMIN(min_r, ref[j]);
590  }
591  mv_predictor[pred_count + 1][0] = sum_x - max_x - min_x;
592  mv_predictor[pred_count + 1][1] = sum_y - max_y - min_y;
593  ref[pred_count + 1] = sum_r - max_r - min_r;
594 
595  if (pred_count == 4) {
596  mv_predictor[pred_count + 1][0] /= 2;
597  mv_predictor[pred_count + 1][1] /= 2;
598  ref[pred_count + 1] /= 2;
599  }
600  pred_count += 2;
601  }
602 
603 skip_mean_and_median:
604  /* zero MV */
605  mv_predictor[pred_count][0] =
606  mv_predictor[pred_count][1] =
607  ref[pred_count] = 0;
608  pred_count++;
609 
610  prev_x = s->cur_pic.motion_val[0][mot_index][0];
611  prev_y = s->cur_pic.motion_val[0][mot_index][1];
612  prev_ref = s->cur_pic.ref_index[0][4 * mb_xy];
613 
614  /* last MV */
615  mv_predictor[pred_count][0] = prev_x;
616  mv_predictor[pred_count][1] = prev_y;
617  ref[pred_count] = prev_ref;
618  pred_count++;
619 
620  best_pred = 0;
621  best_score = 256 * 256 * 256 * 64;
622  for (j = 0; j < pred_count; j++) {
623  int *linesize = s->cur_pic.f->linesize;
624  int score = 0;
625  uint8_t *src = s->cur_pic.f->data[0] +
626  mb_x * 16 + mb_y * 16 * linesize[0];
627 
628  s->cur_pic.motion_val[0][mot_index][0] =
629  s->mv[0][0][0] = mv_predictor[j][0];
630  s->cur_pic.motion_val[0][mot_index][1] =
631  s->mv[0][0][1] = mv_predictor[j][1];
632 
633  // predictor intra or otherwise not available
634  if (ref[j] < 0)
635  continue;
636 
637  s->decode_mb(s->opaque, ref[j], MV_DIR_FORWARD,
638  MV_TYPE_16X16, &s->mv, mb_x, mb_y, 0, 0);
639 
640  if (mb_x > 0 && fixed[mb_xy - 1] > 1) {
641  int k;
642  for (k = 0; k < 16; k++)
643  score += FFABS(src[k * linesize[0] - 1] -
644  src[k * linesize[0]]);
645  }
646  if (mb_x + 1 < mb_width && fixed[mb_xy + 1] > 1) {
647  int k;
648  for (k = 0; k < 16; k++)
649  score += FFABS(src[k * linesize[0] + 15] -
650  src[k * linesize[0] + 16]);
651  }
652  if (mb_y > 0 && fixed[mb_xy - mb_stride] > 1) {
653  int k;
654  for (k = 0; k < 16; k++)
655  score += FFABS(src[k - linesize[0]] - src[k]);
656  }
657  if (mb_y + 1 < mb_height && fixed[mb_xy + mb_stride] > 1) {
658  int k;
659  for (k = 0; k < 16; k++)
660  score += FFABS(src[k + linesize[0] * 15] -
661  src[k + linesize[0] * 16]);
662  }
663 
664  if (score <= best_score) { // <= will favor the last MV
665  best_score = score;
666  best_pred = j;
667  }
668  }
669  s->mv[0][0][0] = mv_predictor[best_pred][0];
670  s->mv[0][0][1] = mv_predictor[best_pred][1];
671 
672  for (i = 0; i < mot_step; i++)
673  for (j = 0; j < mot_step; j++) {
674  s->cur_pic.motion_val[0][mot_index + i + j * mot_stride][0] = s->mv[0][0][0];
675  s->cur_pic.motion_val[0][mot_index + i + j * mot_stride][1] = s->mv[0][0][1];
676  }
677 
678  s->decode_mb(s->opaque, ref[best_pred], MV_DIR_FORWARD,
679  MV_TYPE_16X16, &s->mv, mb_x, mb_y, 0, 0);
680 
681 
682  if (s->mv[0][0][0] != prev_x || s->mv[0][0][1] != prev_y) {
683  fixed[mb_xy] = MV_CHANGED;
684  changed++;
685  } else
686  fixed[mb_xy] = MV_UNCHANGED;
687  }
688  }
689 
690  if (none_left)
691  return;
692 
693  next_blocklist_length = 0;
694 
695  for (blocklist_index = 0; blocklist_index < blocklist_length; blocklist_index++) {
696  const int mb_x = blocklist[blocklist_index][0];
697  const int mb_y = blocklist[blocklist_index][1];
698  const int mb_xy = mb_x + mb_y * mb_stride;
699 
700  if (fixed[mb_xy] & (MV_CHANGED|MV_UNCHANGED|MV_FROZEN)) {
701  fixed[mb_xy] = MV_FROZEN;
702  if (mb_x > 0)
703  add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x - 1, mb_y, mb_xy - 1);
704  if (mb_y > 0)
705  add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x, mb_y - 1, mb_xy - mb_stride);
706  if (mb_x + 1 < mb_width)
707  add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x + 1, mb_y, mb_xy + 1);
708  if (mb_y + 1 < mb_height)
709  add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x, mb_y + 1, mb_xy + mb_stride);
710  }
711  }
712  av_assert0(next_blocklist_length <= mb_height * mb_width);
713  FFSWAP(int , blocklist_length, next_blocklist_length);
714  FFSWAP(void*, blocklist, next_blocklist);
715  }
716 }
717 
718 static int is_intra_more_likely(ERContext *s)
719 {
720  int is_intra_likely, i, j, undamaged_count, skip_amount, mb_x, mb_y;
721 
722  if (!s->last_pic.f || !s->last_pic.f->data[0])
723  return 1; // no previous frame available -> use spatial prediction
724 
725  if (s->avctx->error_concealment & FF_EC_FAVOR_INTER)
726  return 0;
727 
728  undamaged_count = 0;
729  for (i = 0; i < s->mb_num; i++) {
730  const int mb_xy = s->mb_index2xy[i];
731  const int error = s->error_status_table[mb_xy];
732  if (!((error & ER_DC_ERROR) && (error & ER_MV_ERROR)))
733  undamaged_count++;
734  }
735 
736  if (undamaged_count < 5)
737  return 0; // almost all MBs damaged -> use temporal prediction
738 
739  // prevent dsp.sad() check, that requires access to the image
740  if (CONFIG_XVMC &&
741  s->avctx->hwaccel && s->avctx->hwaccel->decode_mb &&
742  s->cur_pic.f->pict_type == AV_PICTURE_TYPE_I)
743  return 1;
744 
745  skip_amount = FFMAX(undamaged_count / 50, 1); // check only up to 50 MBs
746  is_intra_likely = 0;
747 
748  j = 0;
749  for (mb_y = 0; mb_y < s->mb_height - 1; mb_y++) {
750  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
751  int error;
752  const int mb_xy = mb_x + mb_y * s->mb_stride;
753 
754  error = s->error_status_table[mb_xy];
755  if ((error & ER_DC_ERROR) && (error & ER_MV_ERROR))
756  continue; // skip damaged
757 
758  j++;
759  // skip a few to speed things up
760  if ((j % skip_amount) != 0)
761  continue;
762 
763  if (s->cur_pic.f->pict_type == AV_PICTURE_TYPE_I) {
764  int *linesize = s->cur_pic.f->linesize;
765  uint8_t *mb_ptr = s->cur_pic.f->data[0] +
766  mb_x * 16 + mb_y * 16 * linesize[0];
767  uint8_t *last_mb_ptr = s->last_pic.f->data[0] +
768  mb_x * 16 + mb_y * 16 * linesize[0];
769 
770  if (s->avctx->codec_id == AV_CODEC_ID_H264) {
771  // FIXME
772  } else {
773  ff_thread_await_progress(s->last_pic.tf, mb_y, 0);
774  }
775  is_intra_likely += s->mecc.sad[0](NULL, last_mb_ptr, mb_ptr,
776  linesize[0], 16);
777  // FIXME need await_progress() here
778  is_intra_likely -= s->mecc.sad[0](NULL, last_mb_ptr,
779  last_mb_ptr + linesize[0] * 16,
780  linesize[0], 16);
781  } else {
782  if (IS_INTRA(s->cur_pic.mb_type[mb_xy]))
783  is_intra_likely++;
784  else
785  is_intra_likely--;
786  }
787  }
788  }
789 // av_log(NULL, AV_LOG_ERROR, "is_intra_likely: %d type:%d\n", is_intra_likely, s->pict_type);
790  return is_intra_likely > 0;
791 }
792 
793 void ff_er_frame_start(ERContext *s)
794 {
795  if (!s->avctx->error_concealment)
796  return;
797 
798  if (!s->mecc_inited) {
799  ff_me_cmp_init(&s->mecc, s->avctx);
800  s->mecc_inited = 1;
801  }
802 
803  memset(s->error_status_table, ER_MB_ERROR | VP_START | ER_MB_END,
804  s->mb_stride * s->mb_height * sizeof(uint8_t));
805  atomic_init(&s->error_count, 3 * s->mb_num);
806  s->error_occurred = 0;
807 }
808 
809 static int er_supported(ERContext *s)
810 {
811  if(s->avctx->hwaccel && s->avctx->hwaccel->decode_slice ||
812  !s->cur_pic.f ||
813  s->cur_pic.field_picture
814  )
815  return 0;
816  return 1;
817 }
818 
819 /**
820  * Add a slice.
821  * @param endx x component of the last macroblock, can be -1
822  * for the last of the previous line
823  * @param status the status at the end (ER_MV_END, ER_AC_ERROR, ...), it is
824  * assumed that no earlier end or error of the same type occurred
825  */
826 void ff_er_add_slice(ERContext *s, int startx, int starty,
827  int endx, int endy, int status)
828 {
829  const int start_i = av_clip(startx + starty * s->mb_width, 0, s->mb_num - 1);
830  const int end_i = av_clip(endx + endy * s->mb_width, 0, s->mb_num);
831  const int start_xy = s->mb_index2xy[start_i];
832  const int end_xy = s->mb_index2xy[end_i];
833  int mask = -1;
834 
835  if (s->avctx->hwaccel && s->avctx->hwaccel->decode_slice)
836  return;
837 
838  if (start_i > end_i || start_xy > end_xy) {
839  av_log(s->avctx, AV_LOG_ERROR,
840  "internal error, slice end before start\n");
841  return;
842  }
843 
844  if (!s->avctx->error_concealment)
845  return;
846 
847  mask &= ~VP_START;
848  if (status & (ER_AC_ERROR | ER_AC_END)) {
849  mask &= ~(ER_AC_ERROR | ER_AC_END);
850  atomic_fetch_add(&s->error_count, start_i - end_i - 1);
851  }
852  if (status & (ER_DC_ERROR | ER_DC_END)) {
853  mask &= ~(ER_DC_ERROR | ER_DC_END);
854  atomic_fetch_add(&s->error_count, start_i - end_i - 1);
855  }
856  if (status & (ER_MV_ERROR | ER_MV_END)) {
857  mask &= ~(ER_MV_ERROR | ER_MV_END);
858  atomic_fetch_add(&s->error_count, start_i - end_i - 1);
859  }
860 
861  if (status & ER_MB_ERROR) {
862  s->error_occurred = 1;
863  atomic_store(&s->error_count, INT_MAX);
864  }
865 
866  if (mask == ~0x7F) {
867  memset(&s->error_status_table[start_xy], 0,
868  (end_xy - start_xy) * sizeof(uint8_t));
869  } else {
870  int i;
871  for (i = start_xy; i < end_xy; i++)
872  s->error_status_table[i] &= mask;
873  }
874 
875  if (end_i == s->mb_num)
876  atomic_store(&s->error_count, INT_MAX);
877  else {
878  s->error_status_table[end_xy] &= mask;
879  s->error_status_table[end_xy] |= status;
880  }
881 
882  s->error_status_table[start_xy] |= VP_START;
883 
884  if (start_xy > 0 && !(s->avctx->active_thread_type & FF_THREAD_SLICE) &&
885  er_supported(s) && s->avctx->skip_top * s->mb_width < start_i) {
886  int prev_status = s->error_status_table[s->mb_index2xy[start_i - 1]];
887 
888  prev_status &= ~ VP_START;
889  if (prev_status != (ER_MV_END | ER_DC_END | ER_AC_END)) {
890  s->error_occurred = 1;
891  atomic_store(&s->error_count, INT_MAX);
892  }
893  }
894 }
895 
896 void ff_er_frame_end(ERContext *s)
897 {
898  int *linesize = NULL;
899  int i, mb_x, mb_y, error, error_type, dc_error, mv_error, ac_error;
900  int distance;
901  int threshold_part[4] = { 100, 100, 100 };
902  int threshold = 50;
903  int is_intra_likely;
904  int size = s->b8_stride * 2 * s->mb_height;
905 
906  /* We do not support ER of field pictures yet,
907  * though it should not crash if enabled. */
908  if (!s->avctx->error_concealment || !atomic_load(&s->error_count) ||
909  s->avctx->lowres ||
910  !er_supported(s) ||
911  atomic_load(&s->error_count) == 3 * s->mb_width *
912  (s->avctx->skip_top + s->avctx->skip_bottom)) {
913  return;
914  }
915  linesize = s->cur_pic.f->linesize;
916 
917  if ( s->avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO
918  && (FFALIGN(s->avctx->height, 16)&16)
919  && atomic_load(&s->error_count) == 3 * s->mb_width * (s->avctx->skip_top + s->avctx->skip_bottom + 1)) {
920  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
921  int status = s->error_status_table[mb_x + (s->mb_height - 1) * s->mb_stride];
922  if (status != 0x7F)
923  break;
924  }
925 
926  if (mb_x == s->mb_width) {
927  av_log(s->avctx, AV_LOG_DEBUG, "ignoring last missing slice\n");
928  return;
929  }
930  }
931 
932  if (s->last_pic.f) {
933  if (s->last_pic.f->width != s->cur_pic.f->width ||
934  s->last_pic.f->height != s->cur_pic.f->height ||
935  s->last_pic.f->format != s->cur_pic.f->format) {
936  av_log(s->avctx, AV_LOG_WARNING, "Cannot use previous picture in error concealment\n");
937  memset(&s->last_pic, 0, sizeof(s->last_pic));
938  }
939  }
940  if (s->next_pic.f) {
941  if (s->next_pic.f->width != s->cur_pic.f->width ||
942  s->next_pic.f->height != s->cur_pic.f->height ||
943  s->next_pic.f->format != s->cur_pic.f->format) {
944  av_log(s->avctx, AV_LOG_WARNING, "Cannot use next picture in error concealment\n");
945  memset(&s->next_pic, 0, sizeof(s->next_pic));
946  }
947  }
948 
949  if (!s->cur_pic.motion_val[0] || !s->cur_pic.ref_index[0]) {
950  av_log(s->avctx, AV_LOG_ERROR, "Warning MVs not available\n");
951 
952  for (i = 0; i < 2; i++) {
953  s->ref_index_buf[i] = av_buffer_allocz(s->mb_stride * s->mb_height * 4 * sizeof(uint8_t));
954  s->motion_val_buf[i] = av_buffer_allocz((size + 4) * 2 * sizeof(uint16_t));
955  if (!s->ref_index_buf[i] || !s->motion_val_buf[i])
956  break;
957  s->cur_pic.ref_index[i] = s->ref_index_buf[i]->data;
958  s->cur_pic.motion_val[i] = (int16_t (*)[2])s->motion_val_buf[i]->data + 4;
959  }
960  if (i < 2) {
961  for (i = 0; i < 2; i++) {
962  av_buffer_unref(&s->ref_index_buf[i]);
963  av_buffer_unref(&s->motion_val_buf[i]);
964  s->cur_pic.ref_index[i] = NULL;
965  s->cur_pic.motion_val[i] = NULL;
966  }
967  return;
968  }
969  }
970 
971  if (s->avctx->debug & FF_DEBUG_ER) {
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  int status = s->error_status_table[mb_x + mb_y * s->mb_stride];
975 
976  av_log(s->avctx, AV_LOG_DEBUG, "%2X ", status);
977  }
978  av_log(s->avctx, AV_LOG_DEBUG, "\n");
979  }
980  }
981 
982 #if 1
983  /* handle overlapping slices */
984  for (error_type = 1; error_type <= 3; error_type++) {
985  int end_ok = 0;
986 
987  for (i = s->mb_num - 1; i >= 0; i--) {
988  const int mb_xy = s->mb_index2xy[i];
989  int error = s->error_status_table[mb_xy];
990 
991  if (error & (1 << error_type))
992  end_ok = 1;
993  if (error & (8 << error_type))
994  end_ok = 1;
995 
996  if (!end_ok)
997  s->error_status_table[mb_xy] |= 1 << error_type;
998 
999  if (error & VP_START)
1000  end_ok = 0;
1001  }
1002  }
1003 #endif
1004 #if 1
1005  /* handle slices with partitions of different length */
1006  if (s->partitioned_frame) {
1007  int end_ok = 0;
1008 
1009  for (i = s->mb_num - 1; i >= 0; i--) {
1010  const int mb_xy = s->mb_index2xy[i];
1011  int error = s->error_status_table[mb_xy];
1012 
1013  if (error & ER_AC_END)
1014  end_ok = 0;
1015  if ((error & ER_MV_END) ||
1016  (error & ER_DC_END) ||
1017  (error & ER_AC_ERROR))
1018  end_ok = 1;
1019 
1020  if (!end_ok)
1021  s->error_status_table[mb_xy]|= ER_AC_ERROR;
1022 
1023  if (error & VP_START)
1024  end_ok = 0;
1025  }
1026  }
1027 #endif
1028  /* handle missing slices */
1029  if (s->avctx->err_recognition & AV_EF_EXPLODE) {
1030  int end_ok = 1;
1031 
1032  // FIXME + 100 hack
1033  for (i = s->mb_num - 2; i >= s->mb_width + 100; i--) {
1034  const int mb_xy = s->mb_index2xy[i];
1035  int error1 = s->error_status_table[mb_xy];
1036  int error2 = s->error_status_table[s->mb_index2xy[i + 1]];
1037 
1038  if (error1 & VP_START)
1039  end_ok = 1;
1040 
1041  if (error2 == (VP_START | ER_MB_ERROR | ER_MB_END) &&
1042  error1 != (VP_START | ER_MB_ERROR | ER_MB_END) &&
1043  ((error1 & ER_AC_END) || (error1 & ER_DC_END) ||
1044  (error1 & ER_MV_END))) {
1045  // end & uninit
1046  end_ok = 0;
1047  }
1048 
1049  if (!end_ok)
1050  s->error_status_table[mb_xy] |= ER_MB_ERROR;
1051  }
1052  }
1053 
1054 #if 1
1055  /* backward mark errors */
1056  distance = 9999999;
1057  for (error_type = 1; error_type <= 3; error_type++) {
1058  for (i = s->mb_num - 1; i >= 0; i--) {
1059  const int mb_xy = s->mb_index2xy[i];
1060  int error = s->error_status_table[mb_xy];
1061 
1062  if (!s->mbskip_table || !s->mbskip_table[mb_xy]) // FIXME partition specific
1063  distance++;
1064  if (error & (1 << error_type))
1065  distance = 0;
1066 
1067  if (s->partitioned_frame) {
1068  if (distance < threshold_part[error_type - 1])
1069  s->error_status_table[mb_xy] |= 1 << error_type;
1070  } else {
1071  if (distance < threshold)
1072  s->error_status_table[mb_xy] |= 1 << error_type;
1073  }
1074 
1075  if (error & VP_START)
1076  distance = 9999999;
1077  }
1078  }
1079 #endif
1080 
1081  /* forward mark errors */
1082  error = 0;
1083  for (i = 0; i < s->mb_num; i++) {
1084  const int mb_xy = s->mb_index2xy[i];
1085  int old_error = s->error_status_table[mb_xy];
1086 
1087  if (old_error & VP_START) {
1088  error = old_error & ER_MB_ERROR;
1089  } else {
1090  error |= old_error & ER_MB_ERROR;
1091  s->error_status_table[mb_xy] |= error;
1092  }
1093  }
1094 #if 1
1095  /* handle not partitioned case */
1096  if (!s->partitioned_frame) {
1097  for (i = 0; i < s->mb_num; i++) {
1098  const int mb_xy = s->mb_index2xy[i];
1099  int error = s->error_status_table[mb_xy];
1100  if (error & ER_MB_ERROR)
1101  error |= ER_MB_ERROR;
1102  s->error_status_table[mb_xy] = error;
1103  }
1104  }
1105 #endif
1106 
1107  dc_error = ac_error = mv_error = 0;
1108  for (i = 0; i < s->mb_num; i++) {
1109  const int mb_xy = s->mb_index2xy[i];
1110  int error = s->error_status_table[mb_xy];
1111  if (error & ER_DC_ERROR)
1112  dc_error++;
1113  if (error & ER_AC_ERROR)
1114  ac_error++;
1115  if (error & ER_MV_ERROR)
1116  mv_error++;
1117  }
1118  av_log(s->avctx, AV_LOG_INFO, "concealing %d DC, %d AC, %d MV errors in %c frame\n",
1119  dc_error, ac_error, mv_error, av_get_picture_type_char(s->cur_pic.f->pict_type));
1120 
1121  s->cur_pic.f->decode_error_flags |= FF_DECODE_ERROR_CONCEALMENT_ACTIVE;
1122 
1123  is_intra_likely = is_intra_more_likely(s);
1124 
1125  /* set unknown mb-type to most likely */
1126  for (i = 0; i < s->mb_num; i++) {
1127  const int mb_xy = s->mb_index2xy[i];
1128  int error = s->error_status_table[mb_xy];
1129  if (!((error & ER_DC_ERROR) && (error & ER_MV_ERROR)))
1130  continue;
1131 
1132  if (is_intra_likely)
1133  s->cur_pic.mb_type[mb_xy] = MB_TYPE_INTRA4x4;
1134  else
1135  s->cur_pic.mb_type[mb_xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1136  }
1137 
1138  // change inter to intra blocks if no reference frames are available
1139  if (!(s->last_pic.f && s->last_pic.f->data[0]) &&
1140  !(s->next_pic.f && s->next_pic.f->data[0]))
1141  for (i = 0; i < s->mb_num; i++) {
1142  const int mb_xy = s->mb_index2xy[i];
1143  if (!IS_INTRA(s->cur_pic.mb_type[mb_xy]))
1144  s->cur_pic.mb_type[mb_xy] = MB_TYPE_INTRA4x4;
1145  }
1146 
1147  /* handle inter blocks with damaged AC */
1148  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1149  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1150  const int mb_xy = mb_x + mb_y * s->mb_stride;
1151  const int mb_type = s->cur_pic.mb_type[mb_xy];
1152  const int dir = !(s->last_pic.f && s->last_pic.f->data[0]);
1153  const int mv_dir = dir ? MV_DIR_BACKWARD : MV_DIR_FORWARD;
1154  int mv_type;
1155 
1156  int error = s->error_status_table[mb_xy];
1157 
1158  if (IS_INTRA(mb_type))
1159  continue; // intra
1160  if (error & ER_MV_ERROR)
1161  continue; // inter with damaged MV
1162  if (!(error & ER_AC_ERROR))
1163  continue; // undamaged inter
1164 
1165  if (IS_8X8(mb_type)) {
1166  int mb_index = mb_x * 2 + mb_y * 2 * s->b8_stride;
1167  int j;
1168  mv_type = MV_TYPE_8X8;
1169  for (j = 0; j < 4; j++) {
1170  s->mv[0][j][0] = s->cur_pic.motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][0];
1171  s->mv[0][j][1] = s->cur_pic.motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][1];
1172  }
1173  } else {
1174  mv_type = MV_TYPE_16X16;
1175  s->mv[0][0][0] = s->cur_pic.motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][0];
1176  s->mv[0][0][1] = s->cur_pic.motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][1];
1177  }
1178 
1179  s->decode_mb(s->opaque, 0 /* FIXME H.264 partitioned slices need this set */,
1180  mv_dir, mv_type, &s->mv, mb_x, mb_y, 0, 0);
1181  }
1182  }
1183 
1184  /* guess MVs */
1185  if (s->cur_pic.f->pict_type == AV_PICTURE_TYPE_B) {
1186  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1187  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1188  int xy = mb_x * 2 + mb_y * 2 * s->b8_stride;
1189  const int mb_xy = mb_x + mb_y * s->mb_stride;
1190  const int mb_type = s->cur_pic.mb_type[mb_xy];
1191  int mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD;
1192 
1193  int error = s->error_status_table[mb_xy];
1194 
1195  if (IS_INTRA(mb_type))
1196  continue;
1197  if (!(error & ER_MV_ERROR))
1198  continue; // inter with undamaged MV
1199  if (!(error & ER_AC_ERROR))
1200  continue; // undamaged inter
1201 
1202  if (!(s->last_pic.f && s->last_pic.f->data[0]))
1203  mv_dir &= ~MV_DIR_FORWARD;
1204  if (!(s->next_pic.f && s->next_pic.f->data[0]))
1205  mv_dir &= ~MV_DIR_BACKWARD;
1206 
1207  if (s->pp_time) {
1208  int time_pp = s->pp_time;
1209  int time_pb = s->pb_time;
1210 
1211  av_assert0(s->avctx->codec_id != AV_CODEC_ID_H264);
1212  ff_thread_await_progress(s->next_pic.tf, mb_y, 0);
1213 
1214  s->mv[0][0][0] = s->next_pic.motion_val[0][xy][0] * time_pb / time_pp;
1215  s->mv[0][0][1] = s->next_pic.motion_val[0][xy][1] * time_pb / time_pp;
1216  s->mv[1][0][0] = s->next_pic.motion_val[0][xy][0] * (time_pb - time_pp) / time_pp;
1217  s->mv[1][0][1] = s->next_pic.motion_val[0][xy][1] * (time_pb - time_pp) / time_pp;
1218  } else {
1219  s->mv[0][0][0] = 0;
1220  s->mv[0][0][1] = 0;
1221  s->mv[1][0][0] = 0;
1222  s->mv[1][0][1] = 0;
1223  }
1224 
1225  s->decode_mb(s->opaque, 0, mv_dir, MV_TYPE_16X16, &s->mv,
1226  mb_x, mb_y, 0, 0);
1227  }
1228  }
1229  } else
1230  guess_mv(s);
1231 
1232  /* the filters below manipulate raw image, skip them */
1233  if (CONFIG_XVMC && s->avctx->hwaccel && s->avctx->hwaccel->decode_mb)
1234  goto ec_clean;
1235  /* fill DC for inter blocks */
1236  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1237  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1238  int dc, dcu, dcv, y, n;
1239  int16_t *dc_ptr;
1240  uint8_t *dest_y, *dest_cb, *dest_cr;
1241  const int mb_xy = mb_x + mb_y * s->mb_stride;
1242  const int mb_type = s->cur_pic.mb_type[mb_xy];
1243 
1244  // error = s->error_status_table[mb_xy];
1245 
1246  if (IS_INTRA(mb_type) && s->partitioned_frame)
1247  continue;
1248  // if (error & ER_MV_ERROR)
1249  // continue; // inter data damaged FIXME is this good?
1250 
1251  dest_y = s->cur_pic.f->data[0] + mb_x * 16 + mb_y * 16 * linesize[0];
1252  dest_cb = s->cur_pic.f->data[1] + mb_x * 8 + mb_y * 8 * linesize[1];
1253  dest_cr = s->cur_pic.f->data[2] + mb_x * 8 + mb_y * 8 * linesize[2];
1254 
1255  dc_ptr = &s->dc_val[0][mb_x * 2 + mb_y * 2 * s->b8_stride];
1256  for (n = 0; n < 4; n++) {
1257  dc = 0;
1258  for (y = 0; y < 8; y++) {
1259  int x;
1260  for (x = 0; x < 8; x++)
1261  dc += dest_y[x + (n & 1) * 8 +
1262  (y + (n >> 1) * 8) * linesize[0]];
1263  }
1264  dc_ptr[(n & 1) + (n >> 1) * s->b8_stride] = (dc + 4) >> 3;
1265  }
1266 
1267  if (!s->cur_pic.f->data[2])
1268  continue;
1269 
1270  dcu = dcv = 0;
1271  for (y = 0; y < 8; y++) {
1272  int x;
1273  for (x = 0; x < 8; x++) {
1274  dcu += dest_cb[x + y * linesize[1]];
1275  dcv += dest_cr[x + y * linesize[2]];
1276  }
1277  }
1278  s->dc_val[1][mb_x + mb_y * s->mb_stride] = (dcu + 4) >> 3;
1279  s->dc_val[2][mb_x + mb_y * s->mb_stride] = (dcv + 4) >> 3;
1280  }
1281  }
1282 #if 1
1283  /* guess DC for damaged blocks */
1284  guess_dc(s, s->dc_val[0], s->mb_width*2, s->mb_height*2, s->b8_stride, 1);
1285  guess_dc(s, s->dc_val[1], s->mb_width , s->mb_height , s->mb_stride, 0);
1286  guess_dc(s, s->dc_val[2], s->mb_width , s->mb_height , s->mb_stride, 0);
1287 #endif
1288 
1289  /* filter luma DC */
1290  filter181(s->dc_val[0], s->mb_width * 2, s->mb_height * 2, s->b8_stride);
1291 
1292 #if 1
1293  /* render DC only intra */
1294  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1295  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1296  uint8_t *dest_y, *dest_cb, *dest_cr;
1297  const int mb_xy = mb_x + mb_y * s->mb_stride;
1298  const int mb_type = s->cur_pic.mb_type[mb_xy];
1299 
1300  int error = s->error_status_table[mb_xy];
1301 
1302  if (IS_INTER(mb_type))
1303  continue;
1304  if (!(error & ER_AC_ERROR))
1305  continue; // undamaged
1306 
1307  dest_y = s->cur_pic.f->data[0] + mb_x * 16 + mb_y * 16 * linesize[0];
1308  dest_cb = s->cur_pic.f->data[1] + mb_x * 8 + mb_y * 8 * linesize[1];
1309  dest_cr = s->cur_pic.f->data[2] + mb_x * 8 + mb_y * 8 * linesize[2];
1310  if (!s->cur_pic.f->data[2])
1311  dest_cb = dest_cr = NULL;
1312 
1313  put_dc(s, dest_y, dest_cb, dest_cr, mb_x, mb_y);
1314  }
1315  }
1316 #endif
1317 
1318  if (s->avctx->error_concealment & FF_EC_DEBLOCK) {
1319  /* filter horizontal block boundaries */
1320  h_block_filter(s, s->cur_pic.f->data[0], s->mb_width * 2,
1321  s->mb_height * 2, linesize[0], 1);
1322 
1323  /* filter vertical block boundaries */
1324  v_block_filter(s, s->cur_pic.f->data[0], s->mb_width * 2,
1325  s->mb_height * 2, linesize[0], 1);
1326 
1327  if (s->cur_pic.f->data[2]) {
1328  h_block_filter(s, s->cur_pic.f->data[1], s->mb_width,
1329  s->mb_height, linesize[1], 0);
1330  h_block_filter(s, s->cur_pic.f->data[2], s->mb_width,
1331  s->mb_height, linesize[2], 0);
1332  v_block_filter(s, s->cur_pic.f->data[1], s->mb_width,
1333  s->mb_height, linesize[1], 0);
1334  v_block_filter(s, s->cur_pic.f->data[2], s->mb_width,
1335  s->mb_height, linesize[2], 0);
1336  }
1337  }
1338 
1339 ec_clean:
1340  /* clean a few tables */
1341  for (i = 0; i < s->mb_num; i++) {
1342  const int mb_xy = s->mb_index2xy[i];
1343  int error = s->error_status_table[mb_xy];
1344 
1345  if (s->mbskip_table && s->cur_pic.f->pict_type != AV_PICTURE_TYPE_B &&
1346  (error & (ER_DC_ERROR | ER_MV_ERROR | ER_AC_ERROR))) {
1347  s->mbskip_table[mb_xy] = 0;
1348  }
1349  if (s->mbintra_table)
1350  s->mbintra_table[mb_xy] = 1;
1351  }
1352 
1353  for (i = 0; i < 2; i++) {
1354  av_buffer_unref(&s->ref_index_buf[i]);
1355  av_buffer_unref(&s->motion_val_buf[i]);
1356  s->cur_pic.ref_index[i] = NULL;
1357  s->cur_pic.motion_val[i] = NULL;
1358  }
1359 
1360  memset(&s->cur_pic, 0, sizeof(ERPicture));
1361  memset(&s->last_pic, 0, sizeof(ERPicture));
1362  memset(&s->next_pic, 0, sizeof(ERPicture));
1363 }
error
static void error(const char *err)
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#define FF_DECODE_ERROR_CONCEALMENT_ACTIVE
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Definition: error_resilience.c:240
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Definition: mpegvideo.h:256
dc
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
rectangle.h
VP_START
#define VP_START
< current MB is the first after a resync marker
Definition: error_resilience.h:30
size
int size
Definition: twinvq_data.h:10344
color
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
FF_THREAD_SLICE
#define FF_THREAD_SLICE
Decode more than one part of a single frame at once.
Definition: avcodec.h:1452
height
#define height
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
av_get_picture_type_char
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:83
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
internal.h
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
av_always_inline
#define av_always_inline
Definition: attributes.h:49
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
avcodec.h
av_buffer_allocz
AVBufferRef * av_buffer_allocz(size_t size)
Same as av_buffer_alloc(), except the returned buffer will be initialized to zero.
Definition: buffer.c:93
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
me_cmp.h
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
error_resilience.h
atomic_fetch_add
#define atomic_fetch_add(object, operand)
Definition: stdatomic.h:131
cm
#define cm
Definition: dvbsubdec.c:38
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
MV_LISTED
#define MV_LISTED
Definition: error_resilience.c:379
put_dc
static void put_dc(ERContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, int mb_x, int mb_y)
Replace the current MB with a flat dc-only version.
Definition: error_resilience.c:58
IS_INTER
#define IS_INTER(a)
Definition: mpegutils.h:78
ER_MB_END
#define ER_MB_END
Definition: error_resilience.h:39
ER_MV_END
#define ER_MV_END
Definition: error_resilience.h:36
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:251
ff_er_frame_end
void ff_er_frame_end(ERContext *s)
Definition: error_resilience.c:896
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
d
d
Definition: ffmpeg_filter.c:153
fixed
#define fixed(width, name, value)
Definition: cbs_av1.c:566
distance
static float distance(float x, float y, int band)
Definition: nellymoserenc.c:233
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
h
h
Definition: vp9dsp_template.c:2038
ER_AC_END
#define ER_AC_END
Definition: error_resilience.h:34
atomic_init
#define atomic_init(obj, value)
Definition: stdatomic.h:33
MAX_NEG_CROP
#define MAX_NEG_CROP
Definition: mathops.h:31
FF_EC_FAVOR_INTER
#define FF_EC_FAVOR_INTER
Definition: avcodec.h:1295
int
int
Definition: ffmpeg_filter.c:153
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:52
filter181
static void filter181(int16_t *data, int width, int height, ptrdiff_t stride)
Definition: error_resilience.c:96
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