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FFmpeg/libavcodec/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/atomic.h"

  31. #include "libavutil/internal.h"

  32. #include "avcodec.h"

  33. #include "error_resilience.h"

  34. #include "me_cmp.h"

  35. #include "mpegutils.h"

  36. #include "mpegvideo.h"

  37. #include "rectangle.h"

  38. #include "thread.h"

  39. #include "version.h"

  40. 

  41. /**

  42.  * @param stride the number of MVs to get to the next row

  43.  * @param mv_step the number of MVs per row or column in a macroblock

  44.  */

  45. static void set_mv_strides(ERContext *s, ptrdiff_t *mv_step, ptrdiff_t *stride)

  46. {

  47.     if (s->avctx->codec_id == AV_CODEC_ID_H264) {

  48.         av_assert0(s->quarter_sample);

  49.         *mv_step = 4;

  50.         *stride  = s->mb_width * 4;

  51.     } else {

  52.         *mv_step = 2;

  53.         *stride  = s->b8_stride;

  54.     }

  55. }

  56. 

  57. /**

  58.  * Replace the current MB with a flat dc-only version.

  59.  */

  60. static void put_dc(ERContext *s, uint8_t *dest_y, uint8_t *dest_cb,

  61.                    uint8_t *dest_cr, int mb_x, int mb_y)

  62. {

  63.     int *linesize = s->cur_pic.f->linesize;

  64.     int dc, dcu, dcv, y, i;

  65.     for (i = 0; i < 4; i++) {

  66.         dc = s->dc_val[0][mb_x * 2 + (i &  1) + (mb_y * 2 + (i >> 1)) * s->b8_stride];

  67.         if (dc < 0)

  68.             dc = 0;

  69.         else if (dc > 2040)

  70.             dc = 2040;

  71.         for (y = 0; y < 8; y++) {

  72.             int x;

  73.             for (x = 0; x < 8; x++)

  74.                 dest_y[x + (i &  1) * 8 + (y + (i >> 1) * 8) * linesize[0]] = dc / 8;

  75.         }

  76.     }

  77.     dcu = s->dc_val[1][mb_x + mb_y * s->mb_stride];

  78.     dcv = s->dc_val[2][mb_x + mb_y * s->mb_stride];

  79.     if (dcu < 0)

  80.         dcu = 0;

  81.     else if (dcu > 2040)

  82.         dcu = 2040;

  83.     if (dcv < 0)

  84.         dcv = 0;

  85.     else if (dcv > 2040)

  86.         dcv = 2040;

  87. 

  88.     if (dest_cr)

  89.     for (y = 0; y < 8; y++) {

  90.         int x;

  91.         for (x = 0; x < 8; x++) {

  92.             dest_cb[x + y * linesize[1]] = dcu / 8;

  93.             dest_cr[x + y * linesize[2]] = dcv / 8;

  94.         }

  95.     }

  96. }

  97. 

  98. static void filter181(int16_t *data, int width, int height, ptrdiff_t stride)

  99. {

  100.     int x, y;

  101. 

  102.     /* horizontal filter */

  103.     for (y = 1; y < height - 1; y++) {

  104.         int prev_dc = data[0 + y * stride];

  105. 

  106.         for (x = 1; x < width - 1; x++) {

  107.             int dc;

  108.             dc = -prev_dc +

  109.                  data[x     + y * stride] * 8 -

  110.                  data[x + 1 + y * stride];

  111.             dc = (dc * 10923 + 32768) >> 16;

  112.             prev_dc = data[x + y * stride];

  113.             data[x + y * stride] = dc;

  114.         }

  115.     }

  116. 

  117.     /* vertical filter */

  118.     for (x = 1; x < width - 1; x++) {

  119.         int prev_dc = data[x];

  120. 

  121.         for (y = 1; y < height - 1; y++) {

  122.             int dc;

  123. 

  124.             dc = -prev_dc +

  125.                  data[x +  y      * stride] * 8 -

  126.                  data[x + (y + 1) * stride];

  127.             dc = (dc * 10923 + 32768) >> 16;

  128.             prev_dc = data[x + y * stride];

  129.             data[x + y * stride] = dc;

  130.         }

  131.     }

  132. }

  133. 

  134. /**

  135.  * guess the dc of blocks which do not have an undamaged dc

  136.  * @param w     width in 8 pixel blocks

  137.  * @param h     height in 8 pixel blocks

  138.  */

  139. static void guess_dc(ERContext *s, int16_t *dc, int w,

  140.                      int h, ptrdiff_t stride, int is_luma)

  141. {

  142.     int b_x, b_y;

  143.     int16_t  (*col )[4] = av_malloc_array(stride, h*sizeof( int16_t)*4);

  144.     uint32_t (*dist)[4] = av_malloc_array(stride, h*sizeof(uint32_t)*4);

  145. 

  146.     if(!col || !dist) {

  147.         av_log(s->avctx, AV_LOG_ERROR, "guess_dc() is out of memory\n");

  148.         goto fail;

  149.     }

  150. 

  151.     for(b_y=0; b_y<h; b_y++){

  152.         int color= 1024;

  153.         int distance= -1;

  154.         for(b_x=0; b_x<w; b_x++){

  155.             int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;

  156.             int error_j= s->error_status_table[mb_index_j];

  157.             int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);

  158.             if(intra_j==0 || !(error_j&ER_DC_ERROR)){

  159.                 color= dc[b_x + b_y*stride];

  160.                 distance= b_x;

  161.             }

  162.             col [b_x + b_y*stride][1]= color;

  163.             dist[b_x + b_y*stride][1]= distance >= 0 ? b_x-distance : 9999;

  164.         }

  165.         color= 1024;

  166.         distance= -1;

  167.         for(b_x=w-1; b_x>=0; b_x--){

  168.             int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;

  169.             int error_j= s->error_status_table[mb_index_j];

  170.             int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);

  171.             if(intra_j==0 || !(error_j&ER_DC_ERROR)){

  172.                 color= dc[b_x + b_y*stride];

  173.                 distance= b_x;

  174.             }

  175.             col [b_x + b_y*stride][0]= color;

  176.             dist[b_x + b_y*stride][0]= distance >= 0 ? distance-b_x : 9999;

  177.         }

  178.     }

  179.     for(b_x=0; b_x<w; b_x++){

  180.         int color= 1024;

  181.         int distance= -1;

  182.         for(b_y=0; b_y<h; b_y++){

  183.             int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;

  184.             int error_j= s->error_status_table[mb_index_j];

  185.             int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);

  186.             if(intra_j==0 || !(error_j&ER_DC_ERROR)){

  187.                 color= dc[b_x + b_y*stride];

  188.                 distance= b_y;

  189.             }

  190.             col [b_x + b_y*stride][3]= color;

  191.             dist[b_x + b_y*stride][3]= distance >= 0 ? b_y-distance : 9999;

  192.         }

  193.         color= 1024;

  194.         distance= -1;

  195.         for(b_y=h-1; b_y>=0; b_y--){

  196.             int mb_index_j= (b_x>>is_luma) + (b_y>>is_luma)*s->mb_stride;

  197.             int error_j= s->error_status_table[mb_index_j];

  198.             int intra_j = IS_INTRA(s->cur_pic.mb_type[mb_index_j]);

  199.             if(intra_j==0 || !(error_j&ER_DC_ERROR)){

  200.                 color= dc[b_x + b_y*stride];

  201.                 distance= b_y;

  202.             }

  203.             col [b_x + b_y*stride][2]= color;

  204.             dist[b_x + b_y*stride][2]= distance >= 0 ? distance-b_y : 9999;

  205.         }

  206.     }

  207. 

  208.     for (b_y = 0; b_y < h; b_y++) {

  209.         for (b_x = 0; b_x < w; b_x++) {

  210.             int mb_index, error, j;

  211.             int64_t guess, weight_sum;

  212.             mb_index = (b_x >> is_luma) + (b_y >> is_luma) * s->mb_stride;

  213.             error    = s->error_status_table[mb_index];

  214. 

  215.             if (IS_INTER(s->cur_pic.mb_type[mb_index]))

  216.                 continue; // inter

  217.             if (!(error & ER_DC_ERROR))

  218.                 continue; // dc-ok

  219. 

  220.             weight_sum = 0;

  221.             guess      = 0;

  222.             for (j = 0; j < 4; j++) {

  223.                 int64_t weight  = 256 * 256 * 256 * 16 / FFMAX(dist[b_x + b_y*stride][j], 1);

  224.                 guess          += weight*(int64_t)col[b_x + b_y*stride][j];

  225.                 weight_sum     += weight;

  226.             }

  227.             guess = (guess + weight_sum / 2) / weight_sum;

  228.             dc[b_x + b_y * stride] = guess;

  229.         }

  230.     }

  231. 

  232. fail:

  233.     av_freep(&col);

  234.     av_freep(&dist);

  235. }

  236. 

  237. /**

  238.  * simple horizontal deblocking filter used for error resilience

  239.  * @param w     width in 8 pixel blocks

  240.  * @param h     height in 8 pixel blocks

  241.  */

  242. static void h_block_filter(ERContext *s, uint8_t *dst, int w,

  243.                            int h, ptrdiff_t stride, int is_luma)

  244. {

  245.     int b_x, b_y;

  246.     ptrdiff_t mvx_stride, mvy_stride;

  247.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  248.     set_mv_strides(s, &mvx_stride, &mvy_stride);

  249.     mvx_stride >>= is_luma;

  250.     mvy_stride *= mvx_stride;

  251. 

  252.     for (b_y = 0; b_y < h; b_y++) {

  253.         for (b_x = 0; b_x < w - 1; b_x++) {

  254.             int y;

  255.             int left_status  = s->error_status_table[( b_x      >> is_luma) + (b_y >> is_luma) * s->mb_stride];

  256.             int right_status = s->error_status_table[((b_x + 1) >> is_luma) + (b_y >> is_luma) * s->mb_stride];

  257.             int left_intra   = IS_INTRA(s->cur_pic.mb_type[( b_x      >> is_luma) + (b_y >> is_luma) * s->mb_stride]);

  258.             int right_intra  = IS_INTRA(s->cur_pic.mb_type[((b_x + 1) >> is_luma) + (b_y >> is_luma) * s->mb_stride]);

  259.             int left_damage  = left_status & ER_MB_ERROR;

  260.             int right_damage = right_status & ER_MB_ERROR;

  261.             int offset       = b_x * 8 + b_y * stride * 8;

  262.             int16_t *left_mv  = s->cur_pic.motion_val[0][mvy_stride * b_y + mvx_stride *  b_x];

  263.             int16_t *right_mv = s->cur_pic.motion_val[0][mvy_stride * b_y + mvx_stride * (b_x + 1)];

  264.             if (!(left_damage || right_damage))

  265.                 continue; // both undamaged

  266.             if ((!left_intra) && (!right_intra) &&

  267.                 FFABS(left_mv[0] - right_mv[0]) +

  268.                 FFABS(left_mv[1] + right_mv[1]) < 2)

  269.                 continue;

  270. 

  271.             for (y = 0; y < 8; y++) {

  272.                 int a, b, c, d;

  273. 

  274.                 a = dst[offset + 7 + y * stride] - dst[offset + 6 + y * stride];

  275.                 b = dst[offset + 8 + y * stride] - dst[offset + 7 + y * stride];

  276.                 c = dst[offset + 9 + y * stride] - dst[offset + 8 + y * stride];

  277. 

  278.                 d = FFABS(b) - ((FFABS(a) + FFABS(c) + 1) >> 1);

  279.                 d = FFMAX(d, 0);

  280.                 if (b < 0)

  281.                     d = -d;

  282. 

  283.                 if (d == 0)

  284.                     continue;

  285. 

  286.                 if (!(left_damage && right_damage))

  287.                     d = d * 16 / 9;

  288. 

  289.                 if (left_damage) {

  290.                     dst[offset + 7 + y * stride] = cm[dst[offset + 7 + y * stride] + ((d * 7) >> 4)];

  291.                     dst[offset + 6 + y * stride] = cm[dst[offset + 6 + y * stride] + ((d * 5) >> 4)];

  292.                     dst[offset + 5 + y * stride] = cm[dst[offset + 5 + y * stride] + ((d * 3) >> 4)];

  293.                     dst[offset + 4 + y * stride] = cm[dst[offset + 4 + y * stride] + ((d * 1) >> 4)];

  294.                 }

  295.                 if (right_damage) {

  296.                     dst[offset + 8 + y * stride] = cm[dst[offset +  8 + y * stride] - ((d * 7) >> 4)];

  297.                     dst[offset + 9 + y * stride] = cm[dst[offset +  9 + y * stride] - ((d * 5) >> 4)];

  298.                     dst[offset + 10+ y * stride] = cm[dst[offset + 10 + y * stride] - ((d * 3) >> 4)];

  299.                     dst[offset + 11+ y * stride] = cm[dst[offset + 11 + y * stride] - ((d * 1) >> 4)];

  300.                 }

  301.             }

  302.         }

  303.     }

  304. }

  305. 

  306. /**

  307.  * simple vertical deblocking filter used for error resilience

  308.  * @param w     width in 8 pixel blocks

  309.  * @param h     height in 8 pixel blocks

  310.  */

  311. static void v_block_filter(ERContext *s, uint8_t *dst, int w, int h,

  312.                            ptrdiff_t stride, int is_luma)

  313. {

  314.     int b_x, b_y;

  315.     ptrdiff_t mvx_stride, mvy_stride;

  316.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  317.     set_mv_strides(s, &mvx_stride, &mvy_stride);

  318.     mvx_stride >>= is_luma;

  319.     mvy_stride *= mvx_stride;

  320. 

  321.     for (b_y = 0; b_y < h - 1; b_y++) {

  322.         for (b_x = 0; b_x < w; b_x++) {

  323.             int x;

  324.             int top_status    = s->error_status_table[(b_x >> is_luma) +  (b_y      >> is_luma) * s->mb_stride];

  325.             int bottom_status = s->error_status_table[(b_x >> is_luma) + ((b_y + 1) >> is_luma) * s->mb_stride];

  326.             int top_intra     = IS_INTRA(s->cur_pic.mb_type[(b_x >> is_luma) + ( b_y      >> is_luma) * s->mb_stride]);

  327.             int bottom_intra  = IS_INTRA(s->cur_pic.mb_type[(b_x >> is_luma) + ((b_y + 1) >> is_luma) * s->mb_stride]);

  328.             int top_damage    = top_status & ER_MB_ERROR;

  329.             int bottom_damage = bottom_status & ER_MB_ERROR;

  330.             int offset        = b_x * 8 + b_y * stride * 8;

  331. 

  332.             int16_t *top_mv    = s->cur_pic.motion_val[0][mvy_stride *  b_y      + mvx_stride * b_x];

  333.             int16_t *bottom_mv = s->cur_pic.motion_val[0][mvy_stride * (b_y + 1) + mvx_stride * b_x];

  334. 

  335.             if (!(top_damage || bottom_damage))

  336.                 continue; // both undamaged

  337. 

  338.             if ((!top_intra) && (!bottom_intra) &&

  339.                 FFABS(top_mv[0] - bottom_mv[0]) +

  340.                 FFABS(top_mv[1] + bottom_mv[1]) < 2)

  341.                 continue;

  342. 

  343.             for (x = 0; x < 8; x++) {

  344.                 int a, b, c, d;

  345. 

  346.                 a = dst[offset + x + 7 * stride] - dst[offset + x + 6 * stride];

  347.                 b = dst[offset + x + 8 * stride] - dst[offset + x + 7 * stride];

  348.                 c = dst[offset + x + 9 * stride] - dst[offset + x + 8 * stride];

  349. 

  350.                 d = FFABS(b) - ((FFABS(a) + FFABS(c) + 1) >> 1);

  351.                 d = FFMAX(d, 0);

  352.                 if (b < 0)

  353.                     d = -d;

  354. 

  355.                 if (d == 0)

  356.                     continue;

  357. 

  358.                 if (!(top_damage && bottom_damage))

  359.                     d = d * 16 / 9;

  360. 

  361.                 if (top_damage) {

  362.                     dst[offset + x +  7 * stride] = cm[dst[offset + x +  7 * stride] + ((d * 7) >> 4)];

  363.                     dst[offset + x +  6 * stride] = cm[dst[offset + x +  6 * stride] + ((d * 5) >> 4)];

  364.                     dst[offset + x +  5 * stride] = cm[dst[offset + x +  5 * stride] + ((d * 3) >> 4)];

  365.                     dst[offset + x +  4 * stride] = cm[dst[offset + x +  4 * stride] + ((d * 1) >> 4)];

  366.                 }

  367.                 if (bottom_damage) {

  368.                     dst[offset + x +  8 * stride] = cm[dst[offset + x +  8 * stride] - ((d * 7) >> 4)];

  369.                     dst[offset + x +  9 * stride] = cm[dst[offset + x +  9 * stride] - ((d * 5) >> 4)];

  370.                     dst[offset + x + 10 * stride] = cm[dst[offset + x + 10 * stride] - ((d * 3) >> 4)];

  371.                     dst[offset + x + 11 * stride] = cm[dst[offset + x + 11 * stride] - ((d * 1) >> 4)];

  372.                 }

  373.             }

  374.         }

  375.     }

  376. }

  377. 

  378. #define MV_FROZEN    8

  379. #define MV_CHANGED   4

  380. #define MV_UNCHANGED 2

  381. #define MV_LISTED    1

  382. 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)

  383. {

  384.     if (fixed[mb_xy])

  385.         return;

  386.     fixed[mb_xy] = MV_LISTED;

  387.     blocklist[ *blocklist_length   ][0] = mb_x;

  388.     blocklist[(*blocklist_length)++][1] = mb_y;

  389. }

  390. 

  391. static void guess_mv(ERContext *s)

  392. {

  393.     int (*blocklist)[2], (*next_blocklist)[2];

  394.     uint8_t *fixed;

  395.     const ptrdiff_t mb_stride = s->mb_stride;

  396.     const int mb_width  = s->mb_width;

  397.     int mb_height = s->mb_height;

  398.     int i, depth, num_avail;

  399.     int mb_x, mb_y;

  400.     ptrdiff_t mot_step, mot_stride;

  401.     int blocklist_length, next_blocklist_length;

  402. 

  403.     if (s->last_pic.f && s->last_pic.f->data[0])

  404.         mb_height = FFMIN(mb_height, (s->last_pic.f->height+15)>>4);

  405.     if (s->next_pic.f && s->next_pic.f->data[0])

  406.         mb_height = FFMIN(mb_height, (s->next_pic.f->height+15)>>4);

  407. 

  408.     blocklist      = (int (*)[2])s->er_temp_buffer;

  409.     next_blocklist = blocklist + s->mb_stride * s->mb_height;

  410.     fixed          = (uint8_t *)(next_blocklist + s->mb_stride * s->mb_height);

  411. 

  412.     set_mv_strides(s, &mot_step, &mot_stride);

  413. 

  414.     num_avail = 0;

  415.     if (s->last_pic.motion_val[0])

  416.         ff_thread_await_progress(s->last_pic.tf, mb_height-1, 0);

  417.     for (i = 0; i < mb_width * mb_height; i++) {

  418.         const int mb_xy = s->mb_index2xy[i];

  419.         int f = 0;

  420.         int error = s->error_status_table[mb_xy];

  421. 

  422.         if (IS_INTRA(s->cur_pic.mb_type[mb_xy]))

  423.             f = MV_FROZEN; // intra // FIXME check

  424.         if (!(error & ER_MV_ERROR))

  425.             f = MV_FROZEN; // inter with undamaged MV

  426. 

  427.         fixed[mb_xy] = f;

  428.         if (f == MV_FROZEN)

  429.             num_avail++;

  430.         else if(s->last_pic.f->data[0] && s->last_pic.motion_val[0]){

  431.             const int mb_y= mb_xy / s->mb_stride;

  432.             const int mb_x= mb_xy % s->mb_stride;

  433.             const int mot_index= (mb_x + mb_y*mot_stride) * mot_step;

  434.             s->cur_pic.motion_val[0][mot_index][0]= s->last_pic.motion_val[0][mot_index][0];

  435.             s->cur_pic.motion_val[0][mot_index][1]= s->last_pic.motion_val[0][mot_index][1];

  436.             s->cur_pic.ref_index[0][4*mb_xy]      = s->last_pic.ref_index[0][4*mb_xy];

  437.         }

  438.     }

  439. 

  440.     if ((!(s->avctx->error_concealment&FF_EC_GUESS_MVS)) ||

  441.         num_avail <= mb_width / 2) {

  442.         for (mb_y = 0; mb_y < mb_height; mb_y++) {

  443.             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  444.                 const int mb_xy = mb_x + mb_y * s->mb_stride;

  445.                 int mv_dir = (s->last_pic.f && s->last_pic.f->data[0]) ? MV_DIR_FORWARD : MV_DIR_BACKWARD;

  446. 

  447.                 if (IS_INTRA(s->cur_pic.mb_type[mb_xy]))

  448.                     continue;

  449.                 if (!(s->error_status_table[mb_xy] & ER_MV_ERROR))

  450.                     continue;

  451. 

  452.                 s->mv[0][0][0] = 0;

  453.                 s->mv[0][0][1] = 0;

  454.                 s->decode_mb(s->opaque, 0, mv_dir, MV_TYPE_16X16, &s->mv,

  455.                              mb_x, mb_y, 0, 0);

  456.             }

  457.         }

  458.         return;

  459.     }

  460. 

  461.     blocklist_length = 0;

  462.     for (mb_y = 0; mb_y < mb_height; mb_y++) {

  463.         for (mb_x = 0; mb_x < mb_width; mb_x++) {

  464.             const int mb_xy = mb_x + mb_y * mb_stride;

  465.             if (fixed[mb_xy] == MV_FROZEN) {

  466.                 if (mb_x)               add_blocklist(blocklist, &blocklist_length, fixed, mb_x - 1, mb_y, mb_xy - 1);

  467.                 if (mb_y)               add_blocklist(blocklist, &blocklist_length, fixed, mb_x, mb_y - 1, mb_xy - mb_stride);

  468.                 if (mb_x+1 < mb_width)  add_blocklist(blocklist, &blocklist_length, fixed, mb_x + 1, mb_y, mb_xy + 1);

  469.                 if (mb_y+1 < mb_height) add_blocklist(blocklist, &blocklist_length, fixed, mb_x, mb_y + 1, mb_xy + mb_stride);

  470.             }

  471.         }

  472.     }

  473. 

  474.     for (depth = 0; ; depth++) {

  475.         int changed, pass, none_left;

  476.         int blocklist_index;

  477. 

  478.         none_left = 1;

  479.         changed   = 1;

  480.         for (pass = 0; (changed || pass < 2) && pass < 10; pass++) {

  481.             int score_sum = 0;

  482. 

  483.             changed = 0;

  484.             for (blocklist_index = 0; blocklist_index < blocklist_length; blocklist_index++) {

  485.                 const int mb_x = blocklist[blocklist_index][0];

  486.                 const int mb_y = blocklist[blocklist_index][1];

  487.                 const int mb_xy = mb_x + mb_y * mb_stride;

  488.                 int mv_predictor[8][2];

  489.                 int ref[8];

  490.                 int pred_count;

  491.                 int j;

  492.                 int best_score;

  493.                 int best_pred;

  494.                 int mot_index;

  495.                 int prev_x, prev_y, prev_ref;

  496. 

  497.                 if ((mb_x ^ mb_y ^ pass) & 1)

  498.                     continue;

  499.                 av_assert2(fixed[mb_xy] != MV_FROZEN);

  500. 

  501. 

  502.                 av_assert1(!IS_INTRA(s->cur_pic.mb_type[mb_xy]));

  503.                 av_assert1(s->last_pic.f && s->last_pic.f->data[0]);

  504. 

  505.                 j = 0;

  506.                 if (mb_x > 0)

  507.                     j |= fixed[mb_xy - 1];

  508.                 if (mb_x + 1 < mb_width)

  509.                     j |= fixed[mb_xy + 1];

  510.                 if (mb_y > 0)

  511.                     j |= fixed[mb_xy - mb_stride];

  512.                 if (mb_y + 1 < mb_height)

  513.                     j |= fixed[mb_xy + mb_stride];

  514. 

  515.                 av_assert2(j & MV_FROZEN);

  516. 

  517.                 if (!(j & MV_CHANGED) && pass > 1)

  518.                     continue;

  519. 

  520.                 none_left = 0;

  521.                 pred_count = 0;

  522.                 mot_index  = (mb_x + mb_y * mot_stride) * mot_step;

  523. 

  524.                 if (mb_x > 0 && fixed[mb_xy - 1] > 1) {

  525.                     mv_predictor[pred_count][0] =

  526.                         s->cur_pic.motion_val[0][mot_index - mot_step][0];

  527.                     mv_predictor[pred_count][1] =

  528.                         s->cur_pic.motion_val[0][mot_index - mot_step][1];

  529.                     ref[pred_count] =

  530.                         s->cur_pic.ref_index[0][4 * (mb_xy - 1)];

  531.                     pred_count++;

  532.                 }

  533.                 if (mb_x + 1 < mb_width && fixed[mb_xy + 1] > 1) {

  534.                     mv_predictor[pred_count][0] =

  535.                         s->cur_pic.motion_val[0][mot_index + mot_step][0];

  536.                     mv_predictor[pred_count][1] =

  537.                         s->cur_pic.motion_val[0][mot_index + mot_step][1];

  538.                     ref[pred_count] =

  539.                         s->cur_pic.ref_index[0][4 * (mb_xy + 1)];

  540.                     pred_count++;

  541.                 }

  542.                 if (mb_y > 0 && fixed[mb_xy - mb_stride] > 1) {

  543.                     mv_predictor[pred_count][0] =

  544.                         s->cur_pic.motion_val[0][mot_index - mot_stride * mot_step][0];

  545.                     mv_predictor[pred_count][1] =

  546.                         s->cur_pic.motion_val[0][mot_index - mot_stride * mot_step][1];

  547.                     ref[pred_count] =

  548.                         s->cur_pic.ref_index[0][4 * (mb_xy - s->mb_stride)];

  549.                     pred_count++;

  550.                 }

  551.                 if (mb_y + 1<mb_height && fixed[mb_xy + mb_stride] > 1) {

  552.                     mv_predictor[pred_count][0] =

  553.                         s->cur_pic.motion_val[0][mot_index + mot_stride * mot_step][0];

  554.                     mv_predictor[pred_count][1] =

  555.                         s->cur_pic.motion_val[0][mot_index + mot_stride * mot_step][1];

  556.                     ref[pred_count] =

  557.                         s->cur_pic.ref_index[0][4 * (mb_xy + s->mb_stride)];

  558.                     pred_count++;

  559.                 }

  560.                 if (pred_count == 0)

  561.                     continue;

  562. 

  563.                 if (pred_count > 1) {

  564.                     int sum_x = 0, sum_y = 0, sum_r = 0;

  565.                     int max_x, max_y, min_x, min_y, max_r, min_r;

  566. 

  567.                     for (j = 0; j < pred_count; j++) {

  568.                         sum_x += mv_predictor[j][0];

  569.                         sum_y += mv_predictor[j][1];

  570.                         sum_r += ref[j];

  571.                         if (j && ref[j] != ref[j - 1])

  572.                             goto skip_mean_and_median;

  573.                     }

  574. 

  575.                     /* mean */

  576.                     mv_predictor[pred_count][0] = sum_x / j;

  577.                     mv_predictor[pred_count][1] = sum_y / j;

  578.                              ref[pred_count]    = sum_r / j;

  579. 

  580.                     /* median */

  581.                     if (pred_count >= 3) {

  582.                         min_y = min_x = min_r =  99999;

  583.                         max_y = max_x = max_r = -99999;

  584.                     } else {

  585.                         min_x = min_y = max_x = max_y = min_r = max_r = 0;

  586.                     }

  587.                     for (j = 0; j < pred_count; j++) {

  588.                         max_x = FFMAX(max_x, mv_predictor[j][0]);

  589.                         max_y = FFMAX(max_y, mv_predictor[j][1]);

  590.                         max_r = FFMAX(max_r, ref[j]);

  591.                         min_x = FFMIN(min_x, mv_predictor[j][0]);

  592.                         min_y = FFMIN(min_y, mv_predictor[j][1]);

  593.                         min_r = FFMIN(min_r, ref[j]);

  594.                     }

  595.                     mv_predictor[pred_count + 1][0] = sum_x - max_x - min_x;

  596.                     mv_predictor[pred_count + 1][1] = sum_y - max_y - min_y;

  597.                              ref[pred_count + 1]    = sum_r - max_r - min_r;

  598. 

  599.                     if (pred_count == 4) {

  600.                         mv_predictor[pred_count + 1][0] /= 2;

  601.                         mv_predictor[pred_count + 1][1] /= 2;

  602.                                  ref[pred_count + 1]    /= 2;

  603.                     }

  604.                     pred_count += 2;

  605.                 }

  606. 

  607. skip_mean_and_median:

  608.                 /* zero MV */

  609.                 mv_predictor[pred_count][0] =

  610.                 mv_predictor[pred_count][1] =

  611.                          ref[pred_count]    = 0;

  612.                 pred_count++;

  613. 

  614.                 prev_x   = s->cur_pic.motion_val[0][mot_index][0];

  615.                 prev_y   = s->cur_pic.motion_val[0][mot_index][1];

  616.                 prev_ref = s->cur_pic.ref_index[0][4 * mb_xy];

  617. 

  618.                 /* last MV */

  619.                 mv_predictor[pred_count][0] = prev_x;

  620.                 mv_predictor[pred_count][1] = prev_y;

  621.                          ref[pred_count]    = prev_ref;

  622.                 pred_count++;

  623. 

  624.                 best_pred = 0;

  625.                 best_score = 256 * 256 * 256 * 64;

  626.                 for (j = 0; j < pred_count; j++) {

  627.                     int *linesize = s->cur_pic.f->linesize;

  628.                     int score = 0;

  629.                     uint8_t *src = s->cur_pic.f->data[0] +

  630.                                    mb_x * 16 + mb_y * 16 * linesize[0];

  631. 

  632.                     s->cur_pic.motion_val[0][mot_index][0] =

  633.                         s->mv[0][0][0] = mv_predictor[j][0];

  634.                     s->cur_pic.motion_val[0][mot_index][1] =

  635.                         s->mv[0][0][1] = mv_predictor[j][1];

  636. 

  637.                     // predictor intra or otherwise not available

  638.                     if (ref[j] < 0)

  639.                         continue;

  640. 

  641.                     s->decode_mb(s->opaque, ref[j], MV_DIR_FORWARD,

  642.                                  MV_TYPE_16X16, &s->mv, mb_x, mb_y, 0, 0);

  643. 

  644.                     if (mb_x > 0 && fixed[mb_xy - 1] > 1) {

  645.                         int k;

  646.                         for (k = 0; k < 16; k++)

  647.                             score += FFABS(src[k * linesize[0] - 1] -

  648.                                            src[k * linesize[0]]);

  649.                     }

  650.                     if (mb_x + 1 < mb_width && fixed[mb_xy + 1] > 1) {

  651.                         int k;

  652.                         for (k = 0; k < 16; k++)

  653.                             score += FFABS(src[k * linesize[0] + 15] -

  654.                                            src[k * linesize[0] + 16]);

  655.                     }

  656.                     if (mb_y > 0 && fixed[mb_xy - mb_stride] > 1) {

  657.                         int k;

  658.                         for (k = 0; k < 16; k++)

  659.                             score += FFABS(src[k - linesize[0]] - src[k]);

  660.                     }

  661.                     if (mb_y + 1 < mb_height && fixed[mb_xy + mb_stride] > 1) {

  662.                         int k;

  663.                         for (k = 0; k < 16; k++)

  664.                             score += FFABS(src[k + linesize[0] * 15] -

  665.                                            src[k + linesize[0] * 16]);

  666.                     }

  667. 

  668.                     if (score <= best_score) { // <= will favor the last MV

  669.                         best_score = score;

  670.                         best_pred  = j;

  671.                     }

  672.                 }

  673.                 score_sum += best_score;

  674.                 s->mv[0][0][0] = mv_predictor[best_pred][0];

  675.                 s->mv[0][0][1] = mv_predictor[best_pred][1];

  676. 

  677.                 for (i = 0; i < mot_step; i++)

  678.                     for (j = 0; j < mot_step; j++) {

  679.                         s->cur_pic.motion_val[0][mot_index + i + j * mot_stride][0] = s->mv[0][0][0];

  680.                         s->cur_pic.motion_val[0][mot_index + i + j * mot_stride][1] = s->mv[0][0][1];

  681.                     }

  682. 

  683.                 s->decode_mb(s->opaque, ref[best_pred], MV_DIR_FORWARD,

  684.                              MV_TYPE_16X16, &s->mv, mb_x, mb_y, 0, 0);

  685. 

  686. 

  687.                 if (s->mv[0][0][0] != prev_x || s->mv[0][0][1] != prev_y) {

  688.                     fixed[mb_xy] = MV_CHANGED;

  689.                     changed++;

  690.                 } else

  691.                     fixed[mb_xy] = MV_UNCHANGED;

  692.             }

  693.         }

  694. 

  695.         if (none_left)

  696.             return;

  697. 

  698.         next_blocklist_length = 0;

  699. 

  700.         for (blocklist_index = 0; blocklist_index < blocklist_length; blocklist_index++) {

  701.             const int mb_x = blocklist[blocklist_index][0];

  702.             const int mb_y = blocklist[blocklist_index][1];

  703.             const int mb_xy = mb_x + mb_y * mb_stride;

  704. 

  705.             if (fixed[mb_xy] & (MV_CHANGED|MV_UNCHANGED|MV_FROZEN)) {

  706.                 fixed[mb_xy] = MV_FROZEN;

  707.                 if (mb_x > 0)

  708.                     add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x - 1, mb_y, mb_xy - 1);

  709.                 if (mb_y > 0)

  710.                     add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x, mb_y - 1, mb_xy - mb_stride);

  711.                 if (mb_x + 1 < mb_width)

  712.                     add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x + 1, mb_y, mb_xy + 1);

  713.                 if (mb_y + 1 < mb_height)

  714.                     add_blocklist(next_blocklist, &next_blocklist_length, fixed, mb_x, mb_y + 1, mb_xy + mb_stride);

  715.             }

  716.         }

  717.         av_assert0(next_blocklist_length <= mb_height * mb_width);

  718.         FFSWAP(int , blocklist_length, next_blocklist_length);

  719.         FFSWAP(void*, blocklist, next_blocklist);

  720.     }

  721. }

  722. 

  723. static int is_intra_more_likely(ERContext *s)

  724. {

  725.     int is_intra_likely, i, j, undamaged_count, skip_amount, mb_x, mb_y;

  726. 

  727.     if (!s->last_pic.f || !s->last_pic.f->data[0])

  728.         return 1; // no previous frame available -> use spatial prediction

  729. 

  730.     if (s->avctx->error_concealment & FF_EC_FAVOR_INTER)

  731.         return 0;

  732. 

  733.     undamaged_count = 0;

  734.     for (i = 0; i < s->mb_num; i++) {

  735.         const int mb_xy = s->mb_index2xy[i];

  736.         const int error = s->error_status_table[mb_xy];

  737.         if (!((error & ER_DC_ERROR) && (error & ER_MV_ERROR)))

  738.             undamaged_count++;

  739.     }

  740. 

  741.     if (undamaged_count < 5)

  742.         return 0; // almost all MBs damaged -> use temporal prediction

  743. 

  744.     // prevent dsp.sad() check, that requires access to the image

  745.     if (CONFIG_XVMC    &&

  746.         s->avctx->hwaccel && s->avctx->hwaccel->decode_mb &&

  747.         s->cur_pic.f->pict_type == AV_PICTURE_TYPE_I)

  748.         return 1;

  749. 

  750.     skip_amount     = FFMAX(undamaged_count / 50, 1); // check only up to 50 MBs

  751.     is_intra_likely = 0;

  752. 

  753.     j = 0;

  754.     for (mb_y = 0; mb_y < s->mb_height - 1; mb_y++) {

  755.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  756.             int error;

  757.             const int mb_xy = mb_x + mb_y * s->mb_stride;

  758. 

  759.             error = s->error_status_table[mb_xy];

  760.             if ((error & ER_DC_ERROR) && (error & ER_MV_ERROR))

  761.                 continue; // skip damaged

  762. 

  763.             j++;

  764.             // skip a few to speed things up

  765.             if ((j % skip_amount) != 0)

  766.                 continue;

  767. 

  768.             if (s->cur_pic.f->pict_type == AV_PICTURE_TYPE_I) {

  769.                 int *linesize = s->cur_pic.f->linesize;

  770.                 uint8_t *mb_ptr      = s->cur_pic.f->data[0] +

  771.                                        mb_x * 16 + mb_y * 16 * linesize[0];

  772.                 uint8_t *last_mb_ptr = s->last_pic.f->data[0] +

  773.                                        mb_x * 16 + mb_y * 16 * linesize[0];

  774. 

  775.                 if (s->avctx->codec_id == AV_CODEC_ID_H264) {

  776.                     // FIXME

  777.                 } else {

  778.                     ff_thread_await_progress(s->last_pic.tf, mb_y, 0);

  779.                 }

  780.                 is_intra_likely += s->mecc.sad[0](NULL, last_mb_ptr, mb_ptr,

  781.                                                   linesize[0], 16);

  782.                 // FIXME need await_progress() here

  783.                 is_intra_likely -= s->mecc.sad[0](NULL, last_mb_ptr,

  784.                                                   last_mb_ptr + linesize[0] * 16,

  785.                                                   linesize[0], 16);

  786.             } else {

  787.                 if (IS_INTRA(s->cur_pic.mb_type[mb_xy]))

  788.                    is_intra_likely++;

  789.                 else

  790.                    is_intra_likely--;

  791.             }

  792.         }

  793.     }

  794. //      av_log(NULL, AV_LOG_ERROR, "is_intra_likely: %d type:%d\n", is_intra_likely, s->pict_type);

  795.     return is_intra_likely > 0;

  796. }

  797. 

  798. void ff_er_frame_start(ERContext *s)

  799. {

  800.     if (!s->avctx->error_concealment)

  801.         return;

  802. 

  803.     if (!s->mecc_inited) {

  804.         ff_me_cmp_init(&s->mecc, s->avctx);

  805.         s->mecc_inited = 1;

  806.     }

  807. 

  808.     memset(s->error_status_table, ER_MB_ERROR | VP_START | ER_MB_END,

  809.            s->mb_stride * s->mb_height * sizeof(uint8_t));

  810.     atomic_init(&s->error_count, 3 * s->mb_num);

  811.     s->error_occurred = 0;

  812. }

  813. 

  814. static int er_supported(ERContext *s)

  815. {

  816.     if(s->avctx->hwaccel && s->avctx->hwaccel->decode_slice           ||

  817.        !s->cur_pic.f                                                  ||

  818.        s->cur_pic.field_picture

  819.     )

  820.         return 0;

  821.     return 1;

  822. }

  823. 

  824. /**

  825.  * Add a slice.

  826.  * @param endx   x component of the last macroblock, can be -1

  827.  *               for the last of the previous line

  828.  * @param status the status at the end (ER_MV_END, ER_AC_ERROR, ...), it is

  829.  *               assumed that no earlier end or error of the same type occurred

  830.  */

  831. void ff_er_add_slice(ERContext *s, int startx, int starty,

  832.                      int endx, int endy, int status)

  833. {

  834.     const int start_i  = av_clip(startx + starty * s->mb_width, 0, s->mb_num - 1);

  835.     const int end_i    = av_clip(endx   + endy   * s->mb_width, 0, s->mb_num);

  836.     const int start_xy = s->mb_index2xy[start_i];

  837.     const int end_xy   = s->mb_index2xy[end_i];

  838.     int mask           = -1;

  839. 

  840.     if (s->avctx->hwaccel && s->avctx->hwaccel->decode_slice)

  841.         return;

  842. 

  843.     if (start_i > end_i || start_xy > end_xy) {

  844.         av_log(s->avctx, AV_LOG_ERROR,

  845.                "internal error, slice end before start\n");

  846.         return;

  847.     }

  848. 

  849.     if (!s->avctx->error_concealment)

  850.         return;

  851. 

  852.     mask &= ~VP_START;

  853.     if (status & (ER_AC_ERROR | ER_AC_END)) {

  854.         mask           &= ~(ER_AC_ERROR | ER_AC_END);

  855.         atomic_fetch_add(&s->error_count, start_i - end_i - 1);

  856.     }

  857.     if (status & (ER_DC_ERROR | ER_DC_END)) {

  858.         mask           &= ~(ER_DC_ERROR | ER_DC_END);

  859.         atomic_fetch_add(&s->error_count, start_i - end_i - 1);

  860.     }

  861.     if (status & (ER_MV_ERROR | ER_MV_END)) {

  862.         mask           &= ~(ER_MV_ERROR | ER_MV_END);

  863.         atomic_fetch_add(&s->error_count, start_i - end_i - 1);

  864.     }

  865. 

  866.     if (status & ER_MB_ERROR) {

  867.         s->error_occurred = 1;

  868.         atomic_store(&s->error_count, INT_MAX);

  869.     }

  870. 

  871.     if (mask == ~0x7F) {

  872.         memset(&s->error_status_table[start_xy], 0,

  873.                (end_xy - start_xy) * sizeof(uint8_t));

  874.     } else {

  875.         int i;

  876.         for (i = start_xy; i < end_xy; i++)

  877.             s->error_status_table[i] &= mask;

  878.     }

  879. 

  880.     if (end_i == s->mb_num)

  881.         atomic_store(&s->error_count, INT_MAX);

  882.     else {

  883.         s->error_status_table[end_xy] &= mask;

  884.         s->error_status_table[end_xy] |= status;

  885.     }

  886. 

  887.     s->error_status_table[start_xy] |= VP_START;

  888. 

  889.     if (start_xy > 0 && !(s->avctx->active_thread_type & FF_THREAD_SLICE) &&

  890.         er_supported(s) && s->avctx->skip_top * s->mb_width < start_i) {

  891.         int prev_status = s->error_status_table[s->mb_index2xy[start_i - 1]];

  892. 

  893.         prev_status &= ~ VP_START;

  894.         if (prev_status != (ER_MV_END | ER_DC_END | ER_AC_END)) {

  895.             s->error_occurred = 1;

  896.             atomic_store(&s->error_count, INT_MAX);

  897.         }

  898.     }

  899. }

  900. 

  901. void ff_er_frame_end(ERContext *s)

  902. {

  903.     int *linesize = NULL;

  904.     int i, mb_x, mb_y, error, error_type, dc_error, mv_error, ac_error;

  905.     int distance;

  906.     int threshold_part[4] = { 100, 100, 100 };

  907.     int threshold = 50;

  908.     int is_intra_likely;

  909.     int size = s->b8_stride * 2 * s->mb_height;

  910. 

  911.     /* We do not support ER of field pictures yet,

  912.      * though it should not crash if enabled. */

  913.     if (!s->avctx->error_concealment || !atomic_load(&s->error_count)  ||

  914.         s->avctx->lowres                                               ||

  915.         !er_supported(s)                                               ||

  916.         atomic_load(&s->error_count) == 3 * s->mb_width *

  917.                           (s->avctx->skip_top + s->avctx->skip_bottom)) {

  918.         return;

  919.     }

  920.     linesize = s->cur_pic.f->linesize;

  921.     for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  922.         int status = s->error_status_table[mb_x + (s->mb_height - 1) * s->mb_stride];

  923.         if (status != 0x7F)

  924.             break;

  925.     }

  926. 

  927.     if (   mb_x == s->mb_width

  928.         && s->avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO

  929.         && (FFALIGN(s->avctx->height, 16)&16)

  930.         && atomic_load(&s->error_count) == 3 * s->mb_width * (s->avctx->skip_top + s->avctx->skip_bottom + 1)

  931.     ) {

  932.         av_log(s->avctx, AV_LOG_DEBUG, "ignoring last missing slice\n");

  933.         return;

  934.     }

  935. 

  936.     if (s->last_pic.f) {

  937.         if (s->last_pic.f->width  != s->cur_pic.f->width  ||

  938.             s->last_pic.f->height != s->cur_pic.f->height ||

  939.             s->last_pic.f->format != s->cur_pic.f->format) {

  940.             av_log(s->avctx, AV_LOG_WARNING, "Cannot use previous picture in error concealment\n");

  941.             memset(&s->last_pic, 0, sizeof(s->last_pic));

  942.         }

  943.     }

  944.     if (s->next_pic.f) {

  945.         if (s->next_pic.f->width  != s->cur_pic.f->width  ||

  946.             s->next_pic.f->height != s->cur_pic.f->height ||

  947.             s->next_pic.f->format != s->cur_pic.f->format) {

  948.             av_log(s->avctx, AV_LOG_WARNING, "Cannot use next picture in error concealment\n");

  949.             memset(&s->next_pic, 0, sizeof(s->next_pic));

  950.         }

  951.     }

  952. 

  953.     if (!s->cur_pic.motion_val[0] || !s->cur_pic.ref_index[0]) {

  954.         av_log(s->avctx, AV_LOG_ERROR, "Warning MVs not available\n");

  955. 

  956.         for (i = 0; i < 2; i++) {

  957.             s->ref_index_buf[i]  = av_buffer_allocz(s->mb_stride * s->mb_height * 4 * sizeof(uint8_t));

  958.             s->motion_val_buf[i] = av_buffer_allocz((size + 4) * 2 * sizeof(uint16_t));

  959.             if (!s->ref_index_buf[i] || !s->motion_val_buf[i])

  960.                 break;

  961.             s->cur_pic.ref_index[i]  = s->ref_index_buf[i]->data;

  962.             s->cur_pic.motion_val[i] = (int16_t (*)[2])s->motion_val_buf[i]->data + 4;

  963.         }

  964.         if (i < 2) {

  965.             for (i = 0; i < 2; i++) {

  966.                 av_buffer_unref(&s->ref_index_buf[i]);

  967.                 av_buffer_unref(&s->motion_val_buf[i]);

  968.                 s->cur_pic.ref_index[i]  = NULL;

  969.                 s->cur_pic.motion_val[i] = NULL;

  970.             }

  971.             return;

  972.         }

  973.     }

  974. 

  975.     if (s->avctx->debug & FF_DEBUG_ER) {

  976.         for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  977.             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  978.                 int status = s->error_status_table[mb_x + mb_y * s->mb_stride];

  979. 

  980.                 av_log(s->avctx, AV_LOG_DEBUG, "%2X ", status);

  981.             }

  982.             av_log(s->avctx, AV_LOG_DEBUG, "\n");

  983.         }

  984.     }

  985. 

  986. #if 1

  987.     /* handle overlapping slices */

  988.     for (error_type = 1; error_type <= 3; error_type++) {

  989.         int end_ok = 0;

  990. 

  991.         for (i = s->mb_num - 1; i >= 0; i--) {

  992.             const int mb_xy = s->mb_index2xy[i];

  993.             int error       = s->error_status_table[mb_xy];

  994. 

  995.             if (error & (1 << error_type))

  996.                 end_ok = 1;

  997.             if (error & (8 << error_type))

  998.                 end_ok = 1;

  999. 

  1000.             if (!end_ok)

  1001.                 s->error_status_table[mb_xy] |= 1 << error_type;

  1002. 

  1003.             if (error & VP_START)

  1004.                 end_ok = 0;

  1005.         }

  1006.     }

  1007. #endif

  1008. #if 1

  1009.     /* handle slices with partitions of different length */

  1010.     if (s->partitioned_frame) {

  1011.         int end_ok = 0;

  1012. 

  1013.         for (i = s->mb_num - 1; i >= 0; i--) {

  1014.             const int mb_xy = s->mb_index2xy[i];

  1015.             int error       = s->error_status_table[mb_xy];

  1016. 

  1017.             if (error & ER_AC_END)

  1018.                 end_ok = 0;

  1019.             if ((error & ER_MV_END) ||

  1020.                 (error & ER_DC_END) ||

  1021.                 (error & ER_AC_ERROR))

  1022.                 end_ok = 1;

  1023. 

  1024.             if (!end_ok)

  1025.                 s->error_status_table[mb_xy]|= ER_AC_ERROR;

  1026. 

  1027.             if (error & VP_START)

  1028.                 end_ok = 0;

  1029.         }

  1030.     }

  1031. #endif

  1032.     /* handle missing slices */

  1033.     if (s->avctx->err_recognition & AV_EF_EXPLODE) {

  1034.         int end_ok = 1;

  1035. 

  1036.         // FIXME + 100 hack

  1037.         for (i = s->mb_num - 2; i >= s->mb_width + 100; i--) {

  1038.             const int mb_xy = s->mb_index2xy[i];

  1039.             int error1 = s->error_status_table[mb_xy];

  1040.             int error2 = s->error_status_table[s->mb_index2xy[i + 1]];

  1041. 

  1042.             if (error1 & VP_START)

  1043.                 end_ok = 1;

  1044. 

  1045.             if (error2 == (VP_START | ER_MB_ERROR | ER_MB_END) &&

  1046.                 error1 != (VP_START | ER_MB_ERROR | ER_MB_END) &&

  1047.                 ((error1 & ER_AC_END) || (error1 & ER_DC_END) ||

  1048.                 (error1 & ER_MV_END))) {

  1049.                 // end & uninit

  1050.                 end_ok = 0;

  1051.             }

  1052. 

  1053.             if (!end_ok)

  1054.                 s->error_status_table[mb_xy] |= ER_MB_ERROR;

  1055.         }

  1056.     }

  1057. 

  1058. #if 1

  1059.     /* backward mark errors */

  1060.     distance = 9999999;

  1061.     for (error_type = 1; error_type <= 3; error_type++) {

  1062.         for (i = s->mb_num - 1; i >= 0; i--) {

  1063.             const int mb_xy = s->mb_index2xy[i];

  1064.             int       error = s->error_status_table[mb_xy];

  1065. 

  1066.             if (!s->mbskip_table || !s->mbskip_table[mb_xy]) // FIXME partition specific

  1067.                 distance++;

  1068.             if (error & (1 << error_type))

  1069.                 distance = 0;

  1070. 

  1071.             if (s->partitioned_frame) {

  1072.                 if (distance < threshold_part[error_type - 1])

  1073.                     s->error_status_table[mb_xy] |= 1 << error_type;

  1074.             } else {

  1075.                 if (distance < threshold)

  1076.                     s->error_status_table[mb_xy] |= 1 << error_type;

  1077.             }

  1078. 

  1079.             if (error & VP_START)

  1080.                 distance = 9999999;

  1081.         }

  1082.     }

  1083. #endif

  1084. 

  1085.     /* forward mark errors */

  1086.     error = 0;

  1087.     for (i = 0; i < s->mb_num; i++) {

  1088.         const int mb_xy = s->mb_index2xy[i];

  1089.         int old_error   = s->error_status_table[mb_xy];

  1090. 

  1091.         if (old_error & VP_START) {

  1092.             error = old_error & ER_MB_ERROR;

  1093.         } else {

  1094.             error |= old_error & ER_MB_ERROR;

  1095.             s->error_status_table[mb_xy] |= error;

  1096.         }

  1097.     }

  1098. #if 1

  1099.     /* handle not partitioned case */

  1100.     if (!s->partitioned_frame) {

  1101.         for (i = 0; i < s->mb_num; i++) {

  1102.             const int mb_xy = s->mb_index2xy[i];

  1103.             int error = s->error_status_table[mb_xy];

  1104.             if (error & ER_MB_ERROR)

  1105.                 error |= ER_MB_ERROR;

  1106.             s->error_status_table[mb_xy] = error;

  1107.         }

  1108.     }

  1109. #endif

  1110. 

  1111.     dc_error = ac_error = mv_error = 0;

  1112.     for (i = 0; i < s->mb_num; i++) {

  1113.         const int mb_xy = s->mb_index2xy[i];

  1114.         int error = s->error_status_table[mb_xy];

  1115.         if (error & ER_DC_ERROR)

  1116.             dc_error++;

  1117.         if (error & ER_AC_ERROR)

  1118.             ac_error++;

  1119.         if (error & ER_MV_ERROR)

  1120.             mv_error++;

  1121.     }

  1122.     av_log(s->avctx, AV_LOG_INFO, "concealing %d DC, %d AC, %d MV errors in %c frame\n",

  1123.            dc_error, ac_error, mv_error, av_get_picture_type_char(s->cur_pic.f->pict_type));

  1124. 

  1125.     is_intra_likely = is_intra_more_likely(s);

  1126. 

  1127.     /* set unknown mb-type to most likely */

  1128.     for (i = 0; i < s->mb_num; i++) {

  1129.         const int mb_xy = s->mb_index2xy[i];

  1130.         int error = s->error_status_table[mb_xy];

  1131.         if (!((error & ER_DC_ERROR) && (error & ER_MV_ERROR)))

  1132.             continue;

  1133. 

  1134.         if (is_intra_likely)

  1135.             s->cur_pic.mb_type[mb_xy] = MB_TYPE_INTRA4x4;

  1136.         else

  1137.             s->cur_pic.mb_type[mb_xy] = MB_TYPE_16x16 | MB_TYPE_L0;

  1138.     }

  1139. 

  1140.     // change inter to intra blocks if no reference frames are available

  1141.     if (!(s->last_pic.f && s->last_pic.f->data[0]) &&

  1142.         !(s->next_pic.f && s->next_pic.f->data[0]))

  1143.         for (i = 0; i < s->mb_num; i++) {

  1144.             const int mb_xy = s->mb_index2xy[i];

  1145.             if (!IS_INTRA(s->cur_pic.mb_type[mb_xy]))

  1146.                 s->cur_pic.mb_type[mb_xy] = MB_TYPE_INTRA4x4;

  1147.         }

  1148. 

  1149.     /* handle inter blocks with damaged AC */

  1150.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1151.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1152.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1153.             const int mb_type = s->cur_pic.mb_type[mb_xy];

  1154.             const int dir     = !(s->last_pic.f && s->last_pic.f->data[0]);

  1155.             const int mv_dir  = dir ? MV_DIR_BACKWARD : MV_DIR_FORWARD;

  1156.             int mv_type;

  1157. 

  1158.             int error = s->error_status_table[mb_xy];

  1159. 

  1160.             if (IS_INTRA(mb_type))

  1161.                 continue; // intra

  1162.             if (error & ER_MV_ERROR)

  1163.                 continue; // inter with damaged MV

  1164.             if (!(error & ER_AC_ERROR))

  1165.                 continue; // undamaged inter

  1166. 

  1167.             if (IS_8X8(mb_type)) {

  1168.                 int mb_index = mb_x * 2 + mb_y * 2 * s->b8_stride;

  1169.                 int j;

  1170.                 mv_type = MV_TYPE_8X8;

  1171.                 for (j = 0; j < 4; j++) {

  1172.                     s->mv[0][j][0] = s->cur_pic.motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][0];

  1173.                     s->mv[0][j][1] = s->cur_pic.motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][1];

  1174.                 }

  1175.             } else {

  1176.                 mv_type     = MV_TYPE_16X16;

  1177.                 s->mv[0][0][0] = s->cur_pic.motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][0];

  1178.                 s->mv[0][0][1] = s->cur_pic.motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][1];

  1179.             }

  1180. 

  1181.             s->decode_mb(s->opaque, 0 /* FIXME H.264 partitioned slices need this set */,

  1182.                          mv_dir, mv_type, &s->mv, mb_x, mb_y, 0, 0);

  1183.         }

  1184.     }

  1185. 

  1186.     /* guess MVs */

  1187.     if (s->cur_pic.f->pict_type == AV_PICTURE_TYPE_B) {

  1188.         for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1189.             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1190.                 int       xy      = mb_x * 2 + mb_y * 2 * s->b8_stride;

  1191.                 const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1192.                 const int mb_type = s->cur_pic.mb_type[mb_xy];

  1193.                 int mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD;

  1194. 

  1195.                 int error = s->error_status_table[mb_xy];

  1196. 

  1197.                 if (IS_INTRA(mb_type))

  1198.                     continue;

  1199.                 if (!(error & ER_MV_ERROR))

  1200.                     continue; // inter with undamaged MV

  1201.                 if (!(error & ER_AC_ERROR))

  1202.                     continue; // undamaged inter

  1203. 

  1204.                 if (!(s->last_pic.f && s->last_pic.f->data[0]))

  1205.                     mv_dir &= ~MV_DIR_FORWARD;

  1206.                 if (!(s->next_pic.f && s->next_pic.f->data[0]))

  1207.                     mv_dir &= ~MV_DIR_BACKWARD;

  1208. 

  1209.                 if (s->pp_time) {

  1210.                     int time_pp = s->pp_time;

  1211.                     int time_pb = s->pb_time;

  1212. 

  1213.                     av_assert0(s->avctx->codec_id != AV_CODEC_ID_H264);

  1214.                     ff_thread_await_progress(s->next_pic.tf, mb_y, 0);

  1215. 

  1216.                     s->mv[0][0][0] = s->next_pic.motion_val[0][xy][0] *  time_pb            / time_pp;

  1217.                     s->mv[0][0][1] = s->next_pic.motion_val[0][xy][1] *  time_pb            / time_pp;

  1218.                     s->mv[1][0][0] = s->next_pic.motion_val[0][xy][0] * (time_pb - time_pp) / time_pp;

  1219.                     s->mv[1][0][1] = s->next_pic.motion_val[0][xy][1] * (time_pb - time_pp) / time_pp;

  1220.                 } else {

  1221.                     s->mv[0][0][0] = 0;

  1222.                     s->mv[0][0][1] = 0;

  1223.                     s->mv[1][0][0] = 0;

  1224.                     s->mv[1][0][1] = 0;

  1225.                 }

  1226. 

  1227.                 s->decode_mb(s->opaque, 0, mv_dir, MV_TYPE_16X16, &s->mv,

  1228.                              mb_x, mb_y, 0, 0);

  1229.             }

  1230.         }

  1231.     } else

  1232.         guess_mv(s);

  1233. 

  1234.     /* the filters below manipulate raw image, skip them */

  1235.     if (CONFIG_XVMC && s->avctx->hwaccel && s->avctx->hwaccel->decode_mb)

  1236.         goto ec_clean;

  1237.     /* fill DC for inter blocks */

  1238.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1239.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1240.             int dc, dcu, dcv, y, n;

  1241.             int16_t *dc_ptr;

  1242.             uint8_t *dest_y, *dest_cb, *dest_cr;

  1243.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1244.             const int mb_type = s->cur_pic.mb_type[mb_xy];

  1245. 

  1246.             // error = s->error_status_table[mb_xy];

  1247. 

  1248.             if (IS_INTRA(mb_type) && s->partitioned_frame)

  1249.                 continue;

  1250.             // if (error & ER_MV_ERROR)

  1251.             //     continue; // inter data damaged FIXME is this good?

  1252. 

  1253.             dest_y  = s->cur_pic.f->data[0] + mb_x * 16 + mb_y * 16 * linesize[0];

  1254.             dest_cb = s->cur_pic.f->data[1] + mb_x *  8 + mb_y *  8 * linesize[1];

  1255.             dest_cr = s->cur_pic.f->data[2] + mb_x *  8 + mb_y *  8 * linesize[2];

  1256. 

  1257.             dc_ptr = &s->dc_val[0][mb_x * 2 + mb_y * 2 * s->b8_stride];

  1258.             for (n = 0; n < 4; n++) {

  1259.                 dc = 0;

  1260.                 for (y = 0; y < 8; y++) {

  1261.                     int x;

  1262.                     for (x = 0; x < 8; x++)

  1263.                        dc += dest_y[x + (n & 1) * 8 +

  1264.                              (y + (n >> 1) * 8) * linesize[0]];

  1265.                 }

  1266.                 dc_ptr[(n & 1) + (n >> 1) * s->b8_stride] = (dc + 4) >> 3;

  1267.             }

  1268. 

  1269.             if (!s->cur_pic.f->data[2])

  1270.                 continue;

  1271. 

  1272.             dcu = dcv = 0;

  1273.             for (y = 0; y < 8; y++) {

  1274.                 int x;

  1275.                 for (x = 0; x < 8; x++) {

  1276.                     dcu += dest_cb[x + y * linesize[1]];

  1277.                     dcv += dest_cr[x + y * linesize[2]];

  1278.                 }

  1279.             }

  1280.             s->dc_val[1][mb_x + mb_y * s->mb_stride] = (dcu + 4) >> 3;

  1281.             s->dc_val[2][mb_x + mb_y * s->mb_stride] = (dcv + 4) >> 3;

  1282.         }

  1283.     }

  1284. #if 1

  1285.     /* guess DC for damaged blocks */

  1286.     guess_dc(s, s->dc_val[0], s->mb_width*2, s->mb_height*2, s->b8_stride, 1);

  1287.     guess_dc(s, s->dc_val[1], s->mb_width  , s->mb_height  , s->mb_stride, 0);

  1288.     guess_dc(s, s->dc_val[2], s->mb_width  , s->mb_height  , s->mb_stride, 0);

  1289. #endif

  1290. 

  1291.     /* filter luma DC */

  1292.     filter181(s->dc_val[0], s->mb_width * 2, s->mb_height * 2, s->b8_stride);

  1293. 

  1294. #if 1

  1295.     /* render DC only intra */

  1296.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1297.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1298.             uint8_t *dest_y, *dest_cb, *dest_cr;

  1299.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1300.             const int mb_type = s->cur_pic.mb_type[mb_xy];

  1301. 

  1302.             int error = s->error_status_table[mb_xy];

  1303. 

  1304.             if (IS_INTER(mb_type))

  1305.                 continue;

  1306.             if (!(error & ER_AC_ERROR))

  1307.                 continue; // undamaged

  1308. 

  1309.             dest_y  = s->cur_pic.f->data[0] + mb_x * 16 + mb_y * 16 * linesize[0];

  1310.             dest_cb = s->cur_pic.f->data[1] + mb_x *  8 + mb_y *  8 * linesize[1];

  1311.             dest_cr = s->cur_pic.f->data[2] + mb_x *  8 + mb_y *  8 * linesize[2];

  1312.             if (!s->cur_pic.f->data[2])

  1313.                 dest_cb = dest_cr = NULL;

  1314. 

  1315.             put_dc(s, dest_y, dest_cb, dest_cr, mb_x, mb_y);

  1316.         }

  1317.     }

  1318. #endif

  1319. 

  1320.     if (s->avctx->error_concealment & FF_EC_DEBLOCK) {

  1321.         /* filter horizontal block boundaries */

  1322.         h_block_filter(s, s->cur_pic.f->data[0], s->mb_width * 2,

  1323.                        s->mb_height * 2, linesize[0], 1);

  1324. 

  1325.         /* filter vertical block boundaries */

  1326.         v_block_filter(s, s->cur_pic.f->data[0], s->mb_width * 2,

  1327.                        s->mb_height * 2, linesize[0], 1);

  1328. 

  1329.         if (s->cur_pic.f->data[2]) {

  1330.             h_block_filter(s, s->cur_pic.f->data[1], s->mb_width,

  1331.                         s->mb_height, linesize[1], 0);

  1332.             h_block_filter(s, s->cur_pic.f->data[2], s->mb_width,

  1333.                         s->mb_height, linesize[2], 0);

  1334.             v_block_filter(s, s->cur_pic.f->data[1], s->mb_width,

  1335.                         s->mb_height, linesize[1], 0);

  1336.             v_block_filter(s, s->cur_pic.f->data[2], s->mb_width,

  1337.                         s->mb_height, linesize[2], 0);

  1338.         }

  1339.     }

  1340. 

  1341. ec_clean:

  1342.     /* clean a few tables */

  1343.     for (i = 0; i < s->mb_num; i++) {

  1344.         const int mb_xy = s->mb_index2xy[i];

  1345.         int       error = s->error_status_table[mb_xy];

  1346. 

  1347.         if (s->mbskip_table && s->cur_pic.f->pict_type != AV_PICTURE_TYPE_B &&

  1348.             (error & (ER_DC_ERROR | ER_MV_ERROR | ER_AC_ERROR))) {

  1349.             s->mbskip_table[mb_xy] = 0;

  1350.         }

  1351.         if (s->mbintra_table)

  1352.             s->mbintra_table[mb_xy] = 1;

  1353.     }

  1354. 

  1355.     for (i = 0; i < 2; i++) {

  1356.         av_buffer_unref(&s->ref_index_buf[i]);

  1357.         av_buffer_unref(&s->motion_val_buf[i]);

  1358.         s->cur_pic.ref_index[i]  = NULL;

  1359.         s->cur_pic.motion_val[i] = NULL;

  1360.     }

  1361. 

  1362.     memset(&s->cur_pic, 0, sizeof(ERPicture));

  1363.     memset(&s->last_pic, 0, sizeof(ERPicture));

  1364.     memset(&s->next_pic, 0, sizeof(ERPicture));

  1365. }