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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 Libav.

  7.  *

  8.  * Libav is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * Libav is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with Libav; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * Error resilience / concealment.

  26.  */

  27. 

  28. #include <limits.h>

  29. 

  30. #include "libavutil/internal.h"

  31. #include "avcodec.h"

  32. #include "error_resilience.h"

  33. #include "mpegvideo.h"

  34. #include "rectangle.h"

  35. #include "thread.h"

  36. #include "version.h"

  37. 

  38. /**

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

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

  41.  */

  42. static void set_mv_strides(ERContext *s, int *mv_step, int *stride)

  43. {

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

  45.         assert(s->quarter_sample);

  46.         *mv_step = 4;

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

  48.     } else {

  49.         *mv_step = 2;

  50.         *stride  = s->b8_stride;

  51.     }

  52. }

  53. 

  54. /**

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

  56.  */

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

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

  59. {

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

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

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

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

  64.         if (dc < 0)

  65.             dc = 0;

  66.         else if (dc > 2040)

  67.             dc = 2040;

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

  69.             int x;

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

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

  72.         }

  73.     }

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

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

  76.     if (dcu < 0)

  77.         dcu = 0;

  78.     else if (dcu > 2040)

  79.         dcu = 2040;

  80.     if (dcv < 0)

  81.         dcv = 0;

  82.     else if (dcv > 2040)

  83.         dcv = 2040;

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

  85.         int x;

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

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

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

  89.         }

  90.     }

  91. }

  92. 

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

  94. {

  95.     int x, y;

  96. 

  97.     /* horizontal filter */

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

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

  100. 

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

  102.             int dc;

  103.             dc = -prev_dc +

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

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

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

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

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

  109.         }

  110.     }

  111. 

  112.     /* vertical filter */

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

  114.         int prev_dc = data[x];

  115. 

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

  117.             int dc;

  118. 

  119.             dc = -prev_dc +

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

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

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

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

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

  125.         }

  126.     }

  127. }

  128. 

  129. /**

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

  131.  * @param w     width in 8 pixel blocks

  132.  * @param h     height in 8 pixel blocks

  133.  */

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

  135.                      int h, int stride, int is_luma)

  136. {

  137.     int b_x, b_y;

  138. 

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

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

  141.             int color[4]    = { 1024, 1024, 1024, 1024 };

  142.             int distance[4] = { 9999, 9999, 9999, 9999 };

  143.             int mb_index, error, j;

  144.             int64_t guess, weight_sum;

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

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

  147. 

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

  149.                 continue; // inter

  150.             if (!(error & ER_DC_ERROR))

  151.                 continue; // dc-ok

  152. 

  153.             /* right block */

  154.             for (j = b_x + 1; j < w; j++) {

  155.                 int mb_index_j = (j >> 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[0]    = dc[j + b_y * stride];

  160.                     distance[0] = j - b_x;

  161.                     break;

  162.                 }

  163.             }

  164. 

  165.             /* left block */

  166.             for (j = b_x - 1; j >= 0; j--) {

  167.                 int mb_index_j = (j >> is_luma) + (b_y >> is_luma) * s->mb_stride;

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

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

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

  171.                     color[1]    = dc[j + b_y * stride];

  172.                     distance[1] = b_x - j;

  173.                     break;

  174.                 }

  175.             }

  176. 

  177.             /* bottom block */

  178.             for (j = b_y + 1; j < h; j++) {

  179.                 int mb_index_j = (b_x >> is_luma) + (j >> is_luma) * s->mb_stride;

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

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

  182. 

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

  184.                     color[2]    = dc[b_x + j * stride];

  185.                     distance[2] = j - b_y;

  186.                     break;

  187.                 }

  188.             }

  189. 

  190.             /* top block */

  191.             for (j = b_y - 1; j >= 0; j--) {

  192.                 int mb_index_j = (b_x >> is_luma) + (j >> is_luma) * s->mb_stride;

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

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

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

  196.                     color[3]    = dc[b_x + j * stride];

  197.                     distance[3] = b_y - j;

  198.                     break;

  199.                 }

  200.             }

  201. 

  202.             weight_sum = 0;

  203.             guess      = 0;

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

  205.                 int64_t weight  = 256 * 256 * 256 * 16 / distance[j];

  206.                 guess          += weight * (int64_t) color[j];

  207.                 weight_sum     += weight;

  208.             }

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

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

  211.         }

  212.     }

  213. }

  214. 

  215. /**

  216.  * simple horizontal deblocking filter used for error resilience

  217.  * @param w     width in 8 pixel blocks

  218.  * @param h     height in 8 pixel blocks

  219.  */

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

  221.                            int h, int stride, int is_luma)

  222. {

  223.     int b_x, b_y, mvx_stride, mvy_stride;

  224.     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

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

  226.     mvx_stride >>= is_luma;

  227.     mvy_stride *= mvx_stride;

  228. 

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

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

  231.             int y;

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

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

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

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

  236.             int left_damage  = left_status & ER_MB_ERROR;

  237.             int right_damage = right_status & ER_MB_ERROR;

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

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

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

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

  242.                 continue; // both undamaged

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

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

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

  246.                 continue;

  247. 

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

  249.                 int a, b, c, d;

  250. 

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

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

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

  254. 

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

  256.                 d = FFMAX(d, 0);

  257.                 if (b < 0)

  258.                     d = -d;

  259. 

  260.                 if (d == 0)

  261.                     continue;

  262. 

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

  264.                     d = d * 16 / 9;

  265. 

  266.                 if (left_damage) {

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

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

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

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

  271.                 }

  272.                 if (right_damage) {

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

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

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

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

  277.                 }

  278.             }

  279.         }

  280.     }

  281. }

  282. 

  283. /**

  284.  * simple vertical deblocking filter used for error resilience

  285.  * @param w     width in 8 pixel blocks

  286.  * @param h     height in 8 pixel blocks

  287.  */

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

  289.                            int stride, int is_luma)

  290. {

  291.     int b_x, b_y, mvx_stride, mvy_stride;

  292.     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

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

  294.     mvx_stride >>= is_luma;

  295.     mvy_stride *= mvx_stride;

  296. 

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

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

  299.             int x;

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

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

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

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

  304.             int top_damage    = top_status & ER_MB_ERROR;

  305.             int bottom_damage = bottom_status & ER_MB_ERROR;

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

  307. 

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

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

  310. 

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

  312.                 continue; // both undamaged

  313. 

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

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

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

  317.                 continue;

  318. 

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

  320.                 int a, b, c, d;

  321. 

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

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

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

  325. 

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

  327.                 d = FFMAX(d, 0);

  328.                 if (b < 0)

  329.                     d = -d;

  330. 

  331.                 if (d == 0)

  332.                     continue;

  333. 

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

  335.                     d = d * 16 / 9;

  336. 

  337.                 if (top_damage) {

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

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

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

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

  342.                 }

  343.                 if (bottom_damage) {

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

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

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

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

  348.                 }

  349.             }

  350.         }

  351.     }

  352. }

  353. 

  354. static void guess_mv(ERContext *s)

  355. {

  356.     uint8_t *fixed = s->er_temp_buffer;

  357. #define MV_FROZEN    3

  358. #define MV_CHANGED   2

  359. #define MV_UNCHANGED 1

  360.     const int mb_stride = s->mb_stride;

  361.     const int mb_width  = s->mb_width;

  362.     const int mb_height = s->mb_height;

  363.     int i, depth, num_avail;

  364.     int mb_x, mb_y, mot_step, mot_stride;

  365. 

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

  367. 

  368.     num_avail = 0;

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

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

  371.         int f = 0;

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

  373. 

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

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

  376.         if (!(error & ER_MV_ERROR))

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

  378. 

  379.         fixed[mb_xy] = f;

  380.         if (f == MV_FROZEN)

  381.             num_avail++;

  382.     }

  383. 

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

  385.         num_avail <= mb_width / 2) {

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

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

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

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

  390. 

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

  392.                     continue;

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

  394.                     continue;

  395. 

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

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

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

  399.                              mb_x, mb_y, 0, 0);

  400.             }

  401.         }

  402.         return;

  403.     }

  404. 

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

  406.         int changed, pass, none_left;

  407. 

  408.         none_left = 1;

  409.         changed   = 1;

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

  411.             int mb_x, mb_y;

  412.             int score_sum = 0;

  413. 

  414.             changed = 0;

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

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

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

  418.                     int mv_predictor[8][2] = { { 0 } };

  419.                     int ref[8]             = { 0 };

  420.                     int pred_count         = 0;

  421.                     int j;

  422.                     int best_score         = 256 * 256 * 256 * 64;

  423.                     int best_pred          = 0;

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

  425.                     int prev_x, prev_y, prev_ref;

  426. 

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

  428.                         continue;

  429. 

  430.                     if (fixed[mb_xy] == MV_FROZEN)

  431.                         continue;

  432.                     assert(!IS_INTRA(s->cur_pic->mb_type[mb_xy]));

  433.                     assert(s->last_pic && s->last_pic->f.data[0]);

  434. 

  435.                     j = 0;

  436.                     if (mb_x > 0             && fixed[mb_xy - 1]         == MV_FROZEN)

  437.                         j = 1;

  438.                     if (mb_x + 1 < mb_width  && fixed[mb_xy + 1]         == MV_FROZEN)

  439.                         j = 1;

  440.                     if (mb_y > 0             && fixed[mb_xy - mb_stride] == MV_FROZEN)

  441.                         j = 1;

  442.                     if (mb_y + 1 < mb_height && fixed[mb_xy + mb_stride] == MV_FROZEN)

  443.                         j = 1;

  444.                     if (j == 0)

  445.                         continue;

  446. 

  447.                     j = 0;

  448.                     if (mb_x > 0             && fixed[mb_xy - 1        ] == MV_CHANGED)

  449.                         j = 1;

  450.                     if (mb_x + 1 < mb_width  && fixed[mb_xy + 1        ] == MV_CHANGED)

  451.                         j = 1;

  452.                     if (mb_y > 0             && fixed[mb_xy - mb_stride] == MV_CHANGED)

  453.                         j = 1;

  454.                     if (mb_y + 1 < mb_height && fixed[mb_xy + mb_stride] == MV_CHANGED)

  455.                         j = 1;

  456.                     if (j == 0 && pass > 1)

  457.                         continue;

  458. 

  459.                     none_left = 0;

  460. 

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

  462.                         mv_predictor[pred_count][0] =

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

  464.                         mv_predictor[pred_count][1] =

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

  466.                         ref[pred_count] =

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

  468.                         pred_count++;

  469.                     }

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

  471.                         mv_predictor[pred_count][0] =

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

  473.                         mv_predictor[pred_count][1] =

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

  475.                         ref[pred_count] =

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

  477.                         pred_count++;

  478.                     }

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

  480.                         mv_predictor[pred_count][0] =

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

  482.                         mv_predictor[pred_count][1] =

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

  484.                         ref[pred_count] =

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

  486.                         pred_count++;

  487.                     }

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

  489.                         mv_predictor[pred_count][0] =

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

  491.                         mv_predictor[pred_count][1] =

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

  493.                         ref[pred_count] =

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

  495.                         pred_count++;

  496.                     }

  497.                     if (pred_count == 0)

  498.                         continue;

  499. 

  500.                     if (pred_count > 1) {

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

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

  503. 

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

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

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

  507.                             sum_r += ref[j];

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

  509.                                 goto skip_mean_and_median;

  510.                         }

  511. 

  512.                         /* mean */

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

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

  515.                                  ref[pred_count]    = sum_r / j;

  516. 

  517.                         /* median */

  518.                         if (pred_count >= 3) {

  519.                             min_y = min_x = min_r =  99999;

  520.                             max_y = max_x = max_r = -99999;

  521.                         } else {

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

  523.                         }

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

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

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

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

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

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

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

  531.                         }

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

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

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

  535. 

  536.                         if (pred_count == 4) {

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

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

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

  540.                         }

  541.                         pred_count += 2;

  542.                     }

  543. 

  544. skip_mean_and_median:

  545.                     /* zero MV */

  546.                     pred_count++;

  547. 

  548.                     if (!fixed[mb_xy]) {

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

  550.                             // FIXME

  551.                         } else {

  552.                             ff_thread_await_progress(&s->last_pic->tf,

  553.                                                      mb_y, 0);

  554.                         }

  555.                         if (!s->last_pic->motion_val[0] ||

  556.                             !s->last_pic->ref_index[0])

  557.                             goto skip_last_mv;

  558.                         prev_x   = s->last_pic->motion_val[0][mot_index][0];

  559.                         prev_y   = s->last_pic->motion_val[0][mot_index][1];

  560.                         prev_ref = s->last_pic->ref_index[0][4 * mb_xy];

  561.                     } else {

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

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

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

  565.                     }

  566. 

  567.                     /* last MV */

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

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

  570.                              ref[pred_count]    = prev_ref;

  571.                     pred_count++;

  572. 

  573. skip_last_mv:

  574. 

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

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

  577.                         int score = 0;

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

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

  580. 

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

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

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

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

  585. 

  586.                         // predictor intra or otherwise not available

  587.                         if (ref[j] < 0)

  588.                             continue;

  589. 

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

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

  592. 

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

  594.                             int k;

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

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

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

  598.                         }

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

  600.                             int k;

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

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

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

  604.                         }

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

  606.                             int k;

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

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

  609.                         }

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

  611.                             int k;

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

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

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

  615.                         }

  616. 

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

  618.                             best_score = score;

  619.                             best_pred  = j;

  620.                         }

  621.                     }

  622.                     score_sum += best_score;

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

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

  625. 

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

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

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

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

  630.                         }

  631. 

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

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

  634. 

  635. 

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

  637.                         fixed[mb_xy] = MV_CHANGED;

  638.                         changed++;

  639.                     } else

  640.                         fixed[mb_xy] = MV_UNCHANGED;

  641.                 }

  642.             }

  643.         }

  644. 

  645.         if (none_left)

  646.             return;

  647. 

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

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

  650.             if (fixed[mb_xy])

  651.                 fixed[mb_xy] = MV_FROZEN;

  652.         }

  653.     }

  654. }

  655. 

  656. static int is_intra_more_likely(ERContext *s)

  657. {

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

  659. 

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

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

  662. 

  663.     undamaged_count = 0;

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

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

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

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

  668.             undamaged_count++;

  669.     }

  670. 

  671.     if (s->avctx->codec_id == AV_CODEC_ID_H264 && s->ref_count <= 0)

  672.         return 1;

  673. 

  674.     if (undamaged_count < 5)

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

  676. 

  677. #if FF_API_XVMC

  678. FF_DISABLE_DEPRECATION_WARNINGS

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

  680.     if (CONFIG_MPEG_XVMC_DECODER    &&

  681.         s->avctx->xvmc_acceleration &&

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

  683.         return 1;

  684. FF_ENABLE_DEPRECATION_WARNINGS

  685. #endif /* FF_API_XVMC */

  686. 

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

  688.     is_intra_likely = 0;

  689. 

  690.     j = 0;

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

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

  693.             int error;

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

  695. 

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

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

  698.                 continue; // skip damaged

  699. 

  700.             j++;

  701.             // skip a few to speed things up

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

  703.                 continue;

  704. 

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

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

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

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

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

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

  711. 

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

  713.                     // FIXME

  714.                 } else {

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

  716.                 }

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

  718.                                                  linesize[0], 16);

  719.                 is_intra_likely -= s->dsp->sad[0](NULL, last_mb_ptr,

  720.                                                  last_mb_ptr + linesize[0] * 16,

  721.                                                  linesize[0], 16);

  722.             } else {

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

  724.                    is_intra_likely++;

  725.                 else

  726.                    is_intra_likely--;

  727.             }

  728.         }

  729.     }

  730.     return is_intra_likely > 0;

  731. }

  732. 

  733. void ff_er_frame_start(ERContext *s)

  734. {

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

  736.         return;

  737. 

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

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

  740.     s->error_count    = 3 * s->mb_num;

  741.     s->error_occurred = 0;

  742. }

  743. 

  744. /**

  745.  * Add a slice.

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

  747.  *               for the last of the previous line

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

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

  750.  */

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

  752.                      int endx, int endy, int status)

  753. {

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

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

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

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

  758.     int mask           = -1;

  759. 

  760.     if (s->avctx->hwaccel)

  761.         return;

  762. 

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

  764.         av_log(s->avctx, AV_LOG_ERROR,

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

  766.         return;

  767.     }

  768. 

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

  770.         return;

  771. 

  772.     mask &= ~VP_START;

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

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

  775.         s->error_count -= end_i - start_i + 1;

  776.     }

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

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

  779.         s->error_count -= end_i - start_i + 1;

  780.     }

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

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

  783.         s->error_count -= end_i - start_i + 1;

  784.     }

  785. 

  786.     if (status & ER_MB_ERROR) {

  787.         s->error_occurred = 1;

  788.         s->error_count    = INT_MAX;

  789.     }

  790. 

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

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

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

  794.     } else {

  795.         int i;

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

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

  798.     }

  799. 

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

  801.         s->error_count = INT_MAX;

  802.     else {

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

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

  805.     }

  806. 

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

  808. 

  809.     if (start_xy > 0 && s->avctx->thread_count <= 1 &&

  810.         s->avctx->skip_top * s->mb_width < start_i) {

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

  812. 

  813.         prev_status &= ~ VP_START;

  814.         if (prev_status != (ER_MV_END | ER_DC_END | ER_AC_END))

  815.             s->error_count = INT_MAX;

  816.     }

  817. }

  818. 

  819. void ff_er_frame_end(ERContext *s)

  820. {

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

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

  823.     int distance;

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

  825.     int threshold = 50;

  826.     int is_intra_likely;

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

  828. 

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

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

  831.     if (!s->avctx->error_concealment || s->error_count == 0            ||

  832.         s->avctx->hwaccel                                              ||

  833.         !s->cur_pic || s->cur_pic->field_picture                               ||

  834.         s->error_count == 3 * s->mb_width *

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

  836.         return;

  837.     };

  838. 

  839.     if (s->cur_pic->motion_val[0] == NULL) {

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

  841. 

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

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

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

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

  846.                 break;

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

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

  849.         }

  850.         if (i < 2) {

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

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

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

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

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

  856.             }

  857.             return;

  858.         }

  859.     }

  860. 

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

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

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

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

  865. 

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

  867.             }

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

  869.         }

  870.     }

  871. 

  872.     /* handle overlapping slices */

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

  874.         int end_ok = 0;

  875. 

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

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

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

  879. 

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

  881.                 end_ok = 1;

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

  883.                 end_ok = 1;

  884. 

  885.             if (!end_ok)

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

  887. 

  888.             if (error & VP_START)

  889.                 end_ok = 0;

  890.         }

  891.     }

  892. 

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

  894.     if (s->partitioned_frame) {

  895.         int end_ok = 0;

  896. 

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

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

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

  900. 

  901.             if (error & ER_AC_END)

  902.                 end_ok = 0;

  903.             if ((error & ER_MV_END) ||

  904.                 (error & ER_DC_END) ||

  905.                 (error & ER_AC_ERROR))

  906.                 end_ok = 1;

  907. 

  908.             if (!end_ok)

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

  910. 

  911.             if (error & VP_START)

  912.                 end_ok = 0;

  913.         }

  914.     }

  915. 

  916.     /* handle missing slices */

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

  918.         int end_ok = 1;

  919. 

  920.         // FIXME + 100 hack

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

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

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

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

  925. 

  926.             if (error1 & VP_START)

  927.                 end_ok = 1;

  928. 

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

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

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

  932.                 (error1 & ER_MV_END))) {

  933.                 // end & uninit

  934.                 end_ok = 0;

  935.             }

  936. 

  937.             if (!end_ok)

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

  939.         }

  940.     }

  941. 

  942.     /* backward mark errors */

  943.     distance = 9999999;

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

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

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

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

  948. 

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

  950.                 distance++;

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

  952.                 distance = 0;

  953. 

  954.             if (s->partitioned_frame) {

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

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

  957.             } else {

  958.                 if (distance < threshold)

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

  960.             }

  961. 

  962.             if (error & VP_START)

  963.                 distance = 9999999;

  964.         }

  965.     }

  966. 

  967.     /* forward mark errors */

  968.     error = 0;

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

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

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

  972. 

  973.         if (old_error & VP_START) {

  974.             error = old_error & ER_MB_ERROR;

  975.         } else {

  976.             error |= old_error & ER_MB_ERROR;

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

  978.         }

  979.     }

  980. 

  981.     /* handle not partitioned case */

  982.     if (!s->partitioned_frame) {

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

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

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

  986.             if (error & ER_MB_ERROR)

  987.                 error |= ER_MB_ERROR;

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

  989.         }

  990.     }

  991. 

  992.     dc_error = ac_error = mv_error = 0;

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

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

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

  996.         if (error & ER_DC_ERROR)

  997.             dc_error++;

  998.         if (error & ER_AC_ERROR)

  999.             ac_error++;

  1000.         if (error & ER_MV_ERROR)

  1001.             mv_error++;

  1002.     }

  1003.     av_log(s->avctx, AV_LOG_INFO, "concealing %d DC, %d AC, %d MV errors\n",

  1004.            dc_error, ac_error, mv_error);

  1005. 

  1006.     is_intra_likely = is_intra_more_likely(s);

  1007. 

  1008.     /* set unknown mb-type to most likely */

  1009.     for (i = 0; i < s->mb_num; i++) {

  1010.         const int mb_xy = s->mb_index2xy[i];

  1011.         error = s->error_status_table[mb_xy];

  1012.         if (!((error & ER_DC_ERROR) && (error & ER_MV_ERROR)))

  1013.             continue;

  1014. 

  1015.         if (is_intra_likely)

  1016.             s->cur_pic->mb_type[mb_xy] = MB_TYPE_INTRA4x4;

  1017.         else

  1018.             s->cur_pic->mb_type[mb_xy] = MB_TYPE_16x16 | MB_TYPE_L0;

  1019.     }

  1020. 

  1021.     // change inter to intra blocks if no reference frames are available

  1022.     if (!(s->last_pic && s->last_pic->f.data[0]) &&

  1023.         !(s->next_pic && s->next_pic->f.data[0]))

  1024.         for (i = 0; i < s->mb_num; i++) {

  1025.             const int mb_xy = s->mb_index2xy[i];

  1026.             if (!IS_INTRA(s->cur_pic->mb_type[mb_xy]))

  1027.                 s->cur_pic->mb_type[mb_xy] = MB_TYPE_INTRA4x4;

  1028.         }

  1029. 

  1030.     /* handle inter blocks with damaged AC */

  1031.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1032.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1033.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1034.             const int mb_type = s->cur_pic->mb_type[mb_xy];

  1035.             const int dir     = !(s->last_pic && s->last_pic->f.data[0]);

  1036.             const int mv_dir  = dir ? MV_DIR_BACKWARD : MV_DIR_FORWARD;

  1037.             int mv_type;

  1038. 

  1039.             error = s->error_status_table[mb_xy];

  1040. 

  1041.             if (IS_INTRA(mb_type))

  1042.                 continue; // intra

  1043.             if (error & ER_MV_ERROR)

  1044.                 continue; // inter with damaged MV

  1045.             if (!(error & ER_AC_ERROR))

  1046.                 continue; // undamaged inter

  1047. 

  1048.             if (IS_8X8(mb_type)) {

  1049.                 int mb_index = mb_x * 2 + mb_y * 2 * s->b8_stride;

  1050.                 int j;

  1051.                 mv_type = MV_TYPE_8X8;

  1052.                 for (j = 0; j < 4; j++) {

  1053.                     s->mv[0][j][0] = s->cur_pic->motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][0];

  1054.                     s->mv[0][j][1] = s->cur_pic->motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][1];

  1055.                 }

  1056.             } else {

  1057.                 mv_type     = MV_TYPE_16X16;

  1058.                 s->mv[0][0][0] = s->cur_pic->motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][0];

  1059.                 s->mv[0][0][1] = s->cur_pic->motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][1];

  1060.             }

  1061. 

  1062.             s->decode_mb(s->opaque, 0 /* FIXME h264 partitioned slices need this set */,

  1063.                          mv_dir, mv_type, &s->mv, mb_x, mb_y, 0, 0);

  1064.         }

  1065.     }

  1066. 

  1067.     /* guess MVs */

  1068.     if (s->cur_pic->f.pict_type == AV_PICTURE_TYPE_B) {

  1069.         for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1070.             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1071.                 int       xy      = mb_x * 2 + mb_y * 2 * s->b8_stride;

  1072.                 const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1073.                 const int mb_type = s->cur_pic->mb_type[mb_xy];

  1074.                 int mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD;

  1075. 

  1076.                 error = s->error_status_table[mb_xy];

  1077. 

  1078.                 if (IS_INTRA(mb_type))

  1079.                     continue;

  1080.                 if (!(error & ER_MV_ERROR))

  1081.                     continue; // inter with undamaged MV

  1082.                 if (!(error & ER_AC_ERROR))

  1083.                     continue; // undamaged inter

  1084. 

  1085.                 if (!(s->last_pic && s->last_pic->f.data[0]))

  1086.                     mv_dir &= ~MV_DIR_FORWARD;

  1087.                 if (!(s->next_pic && s->next_pic->f.data[0]))

  1088.                     mv_dir &= ~MV_DIR_BACKWARD;

  1089. 

  1090.                 if (s->pp_time) {

  1091.                     int time_pp = s->pp_time;

  1092.                     int time_pb = s->pb_time;

  1093. 

  1094.                     ff_thread_await_progress(&s->next_pic->tf, mb_y, 0);

  1095. 

  1096.                     s->mv[0][0][0] = s->next_pic->motion_val[0][xy][0] *  time_pb            / time_pp;

  1097.                     s->mv[0][0][1] = s->next_pic->motion_val[0][xy][1] *  time_pb            / time_pp;

  1098.                     s->mv[1][0][0] = s->next_pic->motion_val[0][xy][0] * (time_pb - time_pp) / time_pp;

  1099.                     s->mv[1][0][1] = s->next_pic->motion_val[0][xy][1] * (time_pb - time_pp) / time_pp;

  1100.                 } else {

  1101.                     s->mv[0][0][0] = 0;

  1102.                     s->mv[0][0][1] = 0;

  1103.                     s->mv[1][0][0] = 0;

  1104.                     s->mv[1][0][1] = 0;

  1105.                 }

  1106. 

  1107.                 s->decode_mb(s->opaque, 0, mv_dir, MV_TYPE_16X16, &s->mv,

  1108.                              mb_x, mb_y, 0, 0);

  1109.             }

  1110.         }

  1111.     } else

  1112.         guess_mv(s);

  1113. 

  1114. #if FF_API_XVMC

  1115. FF_DISABLE_DEPRECATION_WARNINGS

  1116.     /* the filters below are not XvMC compatible, skip them */

  1117.     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)

  1118.         goto ec_clean;

  1119. FF_ENABLE_DEPRECATION_WARNINGS

  1120. #endif /* FF_API_XVMC */

  1121.     /* fill DC for inter blocks */

  1122.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1123.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1124.             int dc, dcu, dcv, y, n;

  1125.             int16_t *dc_ptr;

  1126.             uint8_t *dest_y, *dest_cb, *dest_cr;

  1127.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1128.             const int mb_type = s->cur_pic->mb_type[mb_xy];

  1129. 

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

  1131. 

  1132.             if (IS_INTRA(mb_type) && s->partitioned_frame)

  1133.                 continue;

  1134.             // if (error & ER_MV_ERROR)

  1135.             //     continue; // inter data damaged FIXME is this good?

  1136. 

  1137.             dest_y  = s->cur_pic->f.data[0] + mb_x * 16 + mb_y * 16 * linesize[0];

  1138.             dest_cb = s->cur_pic->f.data[1] + mb_x *  8 + mb_y *  8 * linesize[1];

  1139.             dest_cr = s->cur_pic->f.data[2] + mb_x *  8 + mb_y *  8 * linesize[2];

  1140. 

  1141.             dc_ptr = &s->dc_val[0][mb_x * 2 + mb_y * 2 * s->b8_stride];

  1142.             for (n = 0; n < 4; n++) {

  1143.                 dc = 0;

  1144.                 for (y = 0; y < 8; y++) {

  1145.                     int x;

  1146.                     for (x = 0; x < 8; x++)

  1147.                        dc += dest_y[x + (n & 1) * 8 +

  1148.                              (y + (n >> 1) * 8) * linesize[0]];

  1149.                 }

  1150.                 dc_ptr[(n & 1) + (n >> 1) * s->b8_stride] = (dc + 4) >> 3;

  1151.             }

  1152. 

  1153.             dcu = dcv = 0;

  1154.             for (y = 0; y < 8; y++) {

  1155.                 int x;

  1156.                 for (x = 0; x < 8; x++) {

  1157.                     dcu += dest_cb[x + y * linesize[1]];

  1158.                     dcv += dest_cr[x + y * linesize[2]];

  1159.                 }

  1160.             }

  1161.             s->dc_val[1][mb_x + mb_y * s->mb_stride] = (dcu + 4) >> 3;

  1162.             s->dc_val[2][mb_x + mb_y * s->mb_stride] = (dcv + 4) >> 3;

  1163.         }

  1164.     }

  1165. 

  1166.     /* guess DC for damaged blocks */

  1167.     guess_dc(s, s->dc_val[0], s->mb_width * 2, s->mb_height * 2, s->b8_stride, 1);

  1168.     guess_dc(s, s->dc_val[1], s->mb_width, s->mb_height, s->mb_stride, 0);

  1169.     guess_dc(s, s->dc_val[2], s->mb_width, s->mb_height, s->mb_stride, 0);

  1170. 

  1171.     /* filter luma DC */

  1172.     filter181(s->dc_val[0], s->mb_width * 2, s->mb_height * 2, s->b8_stride);

  1173. 

  1174.     /* render DC only intra */

  1175.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1176.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1177.             uint8_t *dest_y, *dest_cb, *dest_cr;

  1178.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1179.             const int mb_type = s->cur_pic->mb_type[mb_xy];

  1180. 

  1181.             error = s->error_status_table[mb_xy];

  1182. 

  1183.             if (IS_INTER(mb_type))

  1184.                 continue;

  1185.             if (!(error & ER_AC_ERROR))

  1186.                 continue; // undamaged

  1187. 

  1188.             dest_y  = s->cur_pic->f.data[0] + mb_x * 16 + mb_y * 16 * linesize[0];

  1189.             dest_cb = s->cur_pic->f.data[1] + mb_x *  8 + mb_y *  8 * linesize[1];

  1190.             dest_cr = s->cur_pic->f.data[2] + mb_x *  8 + mb_y *  8 * linesize[2];

  1191. 

  1192.             put_dc(s, dest_y, dest_cb, dest_cr, mb_x, mb_y);

  1193.         }

  1194.     }

  1195. 

  1196.     if (s->avctx->error_concealment & FF_EC_DEBLOCK) {

  1197.         /* filter horizontal block boundaries */

  1198.         h_block_filter(s, s->cur_pic->f.data[0], s->mb_width * 2,

  1199.                        s->mb_height * 2, linesize[0], 1);

  1200.         h_block_filter(s, s->cur_pic->f.data[1], s->mb_width,

  1201.                        s->mb_height, linesize[1], 0);

  1202.         h_block_filter(s, s->cur_pic->f.data[2], s->mb_width,

  1203.                        s->mb_height, linesize[2], 0);

  1204. 

  1205.         /* filter vertical block boundaries */

  1206.         v_block_filter(s, s->cur_pic->f.data[0], s->mb_width * 2,

  1207.                        s->mb_height * 2, linesize[0], 1);

  1208.         v_block_filter(s, s->cur_pic->f.data[1], s->mb_width,

  1209.                        s->mb_height, linesize[1], 0);

  1210.         v_block_filter(s, s->cur_pic->f.data[2], s->mb_width,

  1211.                        s->mb_height, linesize[2], 0);

  1212.     }

  1213. 

  1214. ec_clean:

  1215.     /* clean a few tables */

  1216.     for (i = 0; i < s->mb_num; i++) {

  1217.         const int mb_xy = s->mb_index2xy[i];

  1218.         int       error = s->error_status_table[mb_xy];

  1219. 

  1220.         if (s->cur_pic->f.pict_type != AV_PICTURE_TYPE_B &&

  1221.             (error & (ER_DC_ERROR | ER_MV_ERROR | ER_AC_ERROR))) {

  1222.             s->mbskip_table[mb_xy] = 0;

  1223.         }

  1224.         s->mbintra_table[mb_xy] = 1;

  1225.     }

  1226.     s->cur_pic = NULL;

  1227.     s->next_pic    = NULL;

  1228.     s->last_pic    = NULL;

  1229. }