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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 "avcodec.h"

  31. #include "error_resilience.h"

  32. #include "mpegvideo.h"

  33. #include "rectangle.h"

  34. #include "thread.h"

  35. 

  36. /**

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

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

  39.  */

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

  41. {

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

  43.         assert(s->quarter_sample);

  44.         *mv_step = 4;

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

  46.     } else {

  47.         *mv_step = 2;

  48.         *stride  = s->b8_stride;

  49.     }

  50. }

  51. 

  52. /**

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

  54.  */

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

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

  57. {

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

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

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

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

  62.         if (dc < 0)

  63.             dc = 0;

  64.         else if (dc > 2040)

  65.             dc = 2040;

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

  67.             int x;

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

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

  70.         }

  71.     }

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

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

  74.     if (dcu < 0)

  75.         dcu = 0;

  76.     else if (dcu > 2040)

  77.         dcu = 2040;

  78.     if (dcv < 0)

  79.         dcv = 0;

  80.     else if (dcv > 2040)

  81.         dcv = 2040;

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

  83.         int x;

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

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

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

  87.         }

  88.     }

  89. }

  90. 

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

  92. {

  93.     int x, y;

  94. 

  95.     /* horizontal filter */

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

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

  98. 

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

  100.             int dc;

  101.             dc = -prev_dc +

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

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

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

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

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

  107.         }

  108.     }

  109. 

  110.     /* vertical filter */

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

  112.         int prev_dc = data[x];

  113. 

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

  115.             int dc;

  116. 

  117.             dc = -prev_dc +

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

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

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

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

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

  123.         }

  124.     }

  125. }

  126. 

  127. /**

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

  129.  * @param w     width in 8 pixel blocks

  130.  * @param h     height in 8 pixel blocks

  131.  */

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

  133.                      int h, int stride, int is_luma)

  134. {

  135.     int b_x, b_y;

  136. 

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

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

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

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

  141.             int mb_index, error, j;

  142.             int64_t guess, weight_sum;

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

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

  145. 

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

  147.                 continue; // inter

  148.             if (!(error & ER_DC_ERROR))

  149.                 continue; // dc-ok

  150. 

  151.             /* right block */

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

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

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

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

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

  157.                     color[0]    = dc[j + b_y * stride];

  158.                     distance[0] = j - b_x;

  159.                     break;

  160.                 }

  161.             }

  162. 

  163.             /* left block */

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

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

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

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

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

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

  170.                     distance[1] = b_x - j;

  171.                     break;

  172.                 }

  173.             }

  174. 

  175.             /* bottom block */

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

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

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

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

  180. 

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

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

  183.                     distance[2] = j - b_y;

  184.                     break;

  185.                 }

  186.             }

  187. 

  188.             /* top block */

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

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

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

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

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

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

  195.                     distance[3] = b_y - j;

  196.                     break;

  197.                 }

  198.             }

  199. 

  200.             weight_sum = 0;

  201.             guess      = 0;

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

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

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

  205.                 weight_sum     += weight;

  206.             }

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

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

  209.         }

  210.     }

  211. }

  212. 

  213. /**

  214.  * simple horizontal deblocking filter used for error resilience

  215.  * @param w     width in 8 pixel blocks

  216.  * @param h     height in 8 pixel blocks

  217.  */

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

  219.                            int h, int stride, int is_luma)

  220. {

  221.     int b_x, b_y, mvx_stride, mvy_stride;

  222.     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

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

  224.     mvx_stride >>= is_luma;

  225.     mvy_stride *= mvx_stride;

  226. 

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

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

  229.             int y;

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

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

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

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

  234.             int left_damage  = left_status & ER_MB_ERROR;

  235.             int right_damage = right_status & ER_MB_ERROR;

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

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

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

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

  240.                 continue; // both undamaged

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

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

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

  244.                 continue;

  245. 

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

  247.                 int a, b, c, d;

  248. 

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

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

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

  252. 

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

  254.                 d = FFMAX(d, 0);

  255.                 if (b < 0)

  256.                     d = -d;

  257. 

  258.                 if (d == 0)

  259.                     continue;

  260. 

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

  262.                     d = d * 16 / 9;

  263. 

  264.                 if (left_damage) {

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

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

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

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

  269.                 }

  270.                 if (right_damage) {

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

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

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

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

  275.                 }

  276.             }

  277.         }

  278.     }

  279. }

  280. 

  281. /**

  282.  * simple vertical deblocking filter used for error resilience

  283.  * @param w     width in 8 pixel blocks

  284.  * @param h     height in 8 pixel blocks

  285.  */

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

  287.                            int stride, int is_luma)

  288. {

  289.     int b_x, b_y, mvx_stride, mvy_stride;

  290.     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

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

  292.     mvx_stride >>= is_luma;

  293.     mvy_stride *= mvx_stride;

  294. 

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

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

  297.             int x;

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

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

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

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

  302.             int top_damage    = top_status & ER_MB_ERROR;

  303.             int bottom_damage = bottom_status & ER_MB_ERROR;

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

  305. 

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

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

  308. 

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

  310.                 continue; // both undamaged

  311. 

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

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

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

  315.                 continue;

  316. 

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

  318.                 int a, b, c, d;

  319. 

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

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

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

  323. 

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

  325.                 d = FFMAX(d, 0);

  326.                 if (b < 0)

  327.                     d = -d;

  328. 

  329.                 if (d == 0)

  330.                     continue;

  331. 

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

  333.                     d = d * 16 / 9;

  334. 

  335.                 if (top_damage) {

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

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

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

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

  340.                 }

  341.                 if (bottom_damage) {

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

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

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

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

  346.                 }

  347.             }

  348.         }

  349.     }

  350. }

  351. 

  352. static void guess_mv(ERContext *s)

  353. {

  354.     uint8_t *fixed = s->er_temp_buffer;

  355. #define MV_FROZEN    3

  356. #define MV_CHANGED   2

  357. #define MV_UNCHANGED 1

  358.     const int mb_stride = s->mb_stride;

  359.     const int mb_width  = s->mb_width;

  360.     const int mb_height = s->mb_height;

  361.     int i, depth, num_avail;

  362.     int mb_x, mb_y, mot_step, mot_stride;

  363. 

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

  365. 

  366.     num_avail = 0;

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

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

  369.         int f = 0;

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

  371. 

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

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

  374.         if (!(error & ER_MV_ERROR))

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

  376. 

  377.         fixed[mb_xy] = f;

  378.         if (f == MV_FROZEN)

  379.             num_avail++;

  380.     }

  381. 

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

  383.         num_avail <= mb_width / 2) {

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

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

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

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

  388. 

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

  390.                     continue;

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

  392.                     continue;

  393. 

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

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

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

  397.                              mb_x, mb_y, 0, 0);

  398.             }

  399.         }

  400.         return;

  401.     }

  402. 

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

  404.         int changed, pass, none_left;

  405. 

  406.         none_left = 1;

  407.         changed   = 1;

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

  409.             int mb_x, mb_y;

  410.             int score_sum = 0;

  411. 

  412.             changed = 0;

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

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

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

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

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

  418.                     int pred_count         = 0;

  419.                     int j;

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

  421.                     int best_pred          = 0;

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

  423.                     int prev_x, prev_y, prev_ref;

  424. 

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

  426.                         continue;

  427. 

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

  429.                         continue;

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

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

  432. 

  433.                     j = 0;

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

  435.                         j = 1;

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

  437.                         j = 1;

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

  439.                         j = 1;

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

  441.                         j = 1;

  442.                     if (j == 0)

  443.                         continue;

  444. 

  445.                     j = 0;

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

  447.                         j = 1;

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

  449.                         j = 1;

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

  451.                         j = 1;

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

  453.                         j = 1;

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

  455.                         continue;

  456. 

  457.                     none_left = 0;

  458. 

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

  460.                         mv_predictor[pred_count][0] =

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

  462.                         mv_predictor[pred_count][1] =

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

  464.                         ref[pred_count] =

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

  466.                         pred_count++;

  467.                     }

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

  469.                         mv_predictor[pred_count][0] =

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

  471.                         mv_predictor[pred_count][1] =

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

  473.                         ref[pred_count] =

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

  475.                         pred_count++;

  476.                     }

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

  478.                         mv_predictor[pred_count][0] =

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

  480.                         mv_predictor[pred_count][1] =

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

  482.                         ref[pred_count] =

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

  484.                         pred_count++;

  485.                     }

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

  487.                         mv_predictor[pred_count][0] =

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

  489.                         mv_predictor[pred_count][1] =

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

  491.                         ref[pred_count] =

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

  493.                         pred_count++;

  494.                     }

  495.                     if (pred_count == 0)

  496.                         continue;

  497. 

  498.                     if (pred_count > 1) {

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

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

  501. 

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

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

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

  505.                             sum_r += ref[j];

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

  507.                                 goto skip_mean_and_median;

  508.                         }

  509. 

  510.                         /* mean */

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

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

  513.                                  ref[pred_count]    = sum_r / j;

  514. 

  515.                         /* median */

  516.                         if (pred_count >= 3) {

  517.                             min_y = min_x = min_r =  99999;

  518.                             max_y = max_x = max_r = -99999;

  519.                         } else {

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

  521.                         }

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

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

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

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

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

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

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

  529.                         }

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

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

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

  533. 

  534.                         if (pred_count == 4) {

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

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

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

  538.                         }

  539.                         pred_count += 2;

  540.                     }

  541. 

  542. skip_mean_and_median:

  543.                     /* zero MV */

  544.                     pred_count++;

  545. 

  546.                     if (!fixed[mb_xy]) {

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

  548.                             // FIXME

  549.                         } else {

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

  551.                                                      mb_y, 0);

  552.                         }

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

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

  555.                             goto skip_last_mv;

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

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

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

  559.                     } else {

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

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

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

  563.                     }

  564. 

  565.                     /* last MV */

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

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

  568.                              ref[pred_count]    = prev_ref;

  569.                     pred_count++;

  570. 

  571. skip_last_mv:

  572. 

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

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

  575.                         int score = 0;

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

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

  578. 

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

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

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

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

  583. 

  584.                         // predictor intra or otherwise not available

  585.                         if (ref[j] < 0)

  586.                             continue;

  587. 

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

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

  590. 

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

  592.                             int k;

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

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

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

  596.                         }

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

  598.                             int k;

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

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

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

  602.                         }

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

  604.                             int k;

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

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

  607.                         }

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

  609.                             int k;

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

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

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

  613.                         }

  614. 

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

  616.                             best_score = score;

  617.                             best_pred  = j;

  618.                         }

  619.                     }

  620.                     score_sum += best_score;

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

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

  623. 

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

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

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

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

  628.                         }

  629. 

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

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

  632. 

  633. 

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

  635.                         fixed[mb_xy] = MV_CHANGED;

  636.                         changed++;

  637.                     } else

  638.                         fixed[mb_xy] = MV_UNCHANGED;

  639.                 }

  640.             }

  641.         }

  642. 

  643.         if (none_left)

  644.             return;

  645. 

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

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

  648.             if (fixed[mb_xy])

  649.                 fixed[mb_xy] = MV_FROZEN;

  650.         }

  651.     }

  652. }

  653. 

  654. static int is_intra_more_likely(ERContext *s)

  655. {

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

  657. 

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

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

  660. 

  661.     undamaged_count = 0;

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

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

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

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

  666.             undamaged_count++;

  667.     }

  668. 

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

  670.         return 1;

  671. 

  672.     if (undamaged_count < 5)

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

  674. 

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

  676.     if (CONFIG_MPEG_XVMC_DECODER    &&

  677.         s->avctx->xvmc_acceleration &&

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

  679.         return 1;

  680. 

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

  682.     is_intra_likely = 0;

  683. 

  684.     j = 0;

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

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

  687.             int error;

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

  689. 

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

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

  692.                 continue; // skip damaged

  693. 

  694.             j++;

  695.             // skip a few to speed things up

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

  697.                 continue;

  698. 

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

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

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

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

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

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

  705. 

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

  707.                     // FIXME

  708.                 } else {

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

  710.                 }

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

  712.                                                  linesize[0], 16);

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

  714.                                                  last_mb_ptr + linesize[0] * 16,

  715.                                                  linesize[0], 16);

  716.             } else {

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

  718.                    is_intra_likely++;

  719.                 else

  720.                    is_intra_likely--;

  721.             }

  722.         }

  723.     }

  724.     return is_intra_likely > 0;

  725. }

  726. 

  727. void ff_er_frame_start(ERContext *s)

  728. {

  729.     if (!s->avctx->err_recognition)

  730.         return;

  731. 

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

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

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

  735.     s->error_occurred = 0;

  736. }

  737. 

  738. /**

  739.  * Add a slice.

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

  741.  *               for the last of the previous line

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

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

  744.  */

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

  746.                      int endx, int endy, int status)

  747. {

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

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

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

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

  752.     int mask           = -1;

  753. 

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

  755.         return;

  756. 

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

  758.         av_log(s->avctx, AV_LOG_ERROR,

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

  760.         return;

  761.     }

  762. 

  763.     if (!s->avctx->err_recognition)

  764.         return;

  765. 

  766.     mask &= ~VP_START;

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

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

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

  770.     }

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

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

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

  774.     }

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

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

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

  778.     }

  779. 

  780.     if (status & ER_MB_ERROR) {

  781.         s->error_occurred = 1;

  782.         s->error_count    = INT_MAX;

  783.     }

  784. 

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

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

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

  788.     } else {

  789.         int i;

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

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

  792.     }

  793. 

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

  795.         s->error_count = INT_MAX;

  796.     else {

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

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

  799.     }

  800. 

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

  802. 

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

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

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

  806. 

  807.         prev_status &= ~ VP_START;

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

  809.             s->error_count = INT_MAX;

  810.     }

  811. }

  812. 

  813. void ff_er_frame_end(ERContext *s)

  814. {

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

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

  817.     int distance;

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

  819.     int threshold = 50;

  820.     int is_intra_likely;

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

  822. 

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

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

  825.     if (!s->avctx->err_recognition || s->error_count == 0              ||

  826.         s->avctx->hwaccel                                              ||

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

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

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

  830.         return;

  831.     };

  832. 

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

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

  835. 

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

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

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

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

  840.                 break;

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

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

  843.         }

  844.         if (i < 2) {

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

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

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

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

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

  850.             }

  851.             return;

  852.         }

  853.     }

  854. 

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

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

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

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

  859. 

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

  861.             }

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

  863.         }

  864.     }

  865. 

  866.     /* handle overlapping slices */

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

  868.         int end_ok = 0;

  869. 

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

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

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

  873. 

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

  875.                 end_ok = 1;

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

  877.                 end_ok = 1;

  878. 

  879.             if (!end_ok)

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

  881. 

  882.             if (error & VP_START)

  883.                 end_ok = 0;

  884.         }

  885.     }

  886. 

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

  888.     if (s->partitioned_frame) {

  889.         int end_ok = 0;

  890. 

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

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

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

  894. 

  895.             if (error & ER_AC_END)

  896.                 end_ok = 0;

  897.             if ((error & ER_MV_END) ||

  898.                 (error & ER_DC_END) ||

  899.                 (error & ER_AC_ERROR))

  900.                 end_ok = 1;

  901. 

  902.             if (!end_ok)

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

  904. 

  905.             if (error & VP_START)

  906.                 end_ok = 0;

  907.         }

  908.     }

  909. 

  910.     /* handle missing slices */

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

  912.         int end_ok = 1;

  913. 

  914.         // FIXME + 100 hack

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

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

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

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

  919. 

  920.             if (error1 & VP_START)

  921.                 end_ok = 1;

  922. 

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

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

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

  926.                 (error1 & ER_MV_END))) {

  927.                 // end & uninit

  928.                 end_ok = 0;

  929.             }

  930. 

  931.             if (!end_ok)

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

  933.         }

  934.     }

  935. 

  936.     /* backward mark errors */

  937.     distance = 9999999;

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

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

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

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

  942. 

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

  944.                 distance++;

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

  946.                 distance = 0;

  947. 

  948.             if (s->partitioned_frame) {

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

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

  951.             } else {

  952.                 if (distance < threshold)

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

  954.             }

  955. 

  956.             if (error & VP_START)

  957.                 distance = 9999999;

  958.         }

  959.     }

  960. 

  961.     /* forward mark errors */

  962.     error = 0;

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

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

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

  966. 

  967.         if (old_error & VP_START) {

  968.             error = old_error & ER_MB_ERROR;

  969.         } else {

  970.             error |= old_error & ER_MB_ERROR;

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

  972.         }

  973.     }

  974. 

  975.     /* handle not partitioned case */

  976.     if (!s->partitioned_frame) {

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

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

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

  980.             if (error & ER_MB_ERROR)

  981.                 error |= ER_MB_ERROR;

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

  983.         }

  984.     }

  985. 

  986.     dc_error = ac_error = mv_error = 0;

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

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

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

  990.         if (error & ER_DC_ERROR)

  991.             dc_error++;

  992.         if (error & ER_AC_ERROR)

  993.             ac_error++;

  994.         if (error & ER_MV_ERROR)

  995.             mv_error++;

  996.     }

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

  998.            dc_error, ac_error, mv_error);

  999. 

  1000.     is_intra_likely = is_intra_more_likely(s);

  1001. 

  1002.     /* set unknown mb-type to most likely */

  1003.     for (i = 0; i < s->mb_num; i++) {

  1004.         const int mb_xy = s->mb_index2xy[i];

  1005.         error = s->error_status_table[mb_xy];

  1006.         if (!((error & ER_DC_ERROR) && (error & ER_MV_ERROR)))

  1007.             continue;

  1008. 

  1009.         if (is_intra_likely)

  1010.             s->cur_pic->mb_type[mb_xy] = MB_TYPE_INTRA4x4;

  1011.         else

  1012.             s->cur_pic->mb_type[mb_xy] = MB_TYPE_16x16 | MB_TYPE_L0;

  1013.     }

  1014. 

  1015.     // change inter to intra blocks if no reference frames are available

  1016.     if (!(s->last_pic && s->last_pic->f.data[0]) &&

  1017.         !(s->next_pic && s->next_pic->f.data[0]))

  1018.         for (i = 0; i < s->mb_num; i++) {

  1019.             const int mb_xy = s->mb_index2xy[i];

  1020.             if (!IS_INTRA(s->cur_pic->mb_type[mb_xy]))

  1021.                 s->cur_pic->mb_type[mb_xy] = MB_TYPE_INTRA4x4;

  1022.         }

  1023. 

  1024.     /* handle inter blocks with damaged AC */

  1025.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1026.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1027.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1028.             const int mb_type = s->cur_pic->mb_type[mb_xy];

  1029.             const int dir     = !(s->last_pic && s->last_pic->f.data[0]);

  1030.             const int mv_dir  = dir ? MV_DIR_BACKWARD : MV_DIR_FORWARD;

  1031.             int mv_type;

  1032. 

  1033.             error = s->error_status_table[mb_xy];

  1034. 

  1035.             if (IS_INTRA(mb_type))

  1036.                 continue; // intra

  1037.             if (error & ER_MV_ERROR)

  1038.                 continue; // inter with damaged MV

  1039.             if (!(error & ER_AC_ERROR))

  1040.                 continue; // undamaged inter

  1041. 

  1042.             if (IS_8X8(mb_type)) {

  1043.                 int mb_index = mb_x * 2 + mb_y * 2 * s->b8_stride;

  1044.                 int j;

  1045.                 mv_type = MV_TYPE_8X8;

  1046.                 for (j = 0; j < 4; j++) {

  1047.                     s->mv[0][j][0] = s->cur_pic->motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][0];

  1048.                     s->mv[0][j][1] = s->cur_pic->motion_val[dir][mb_index + (j & 1) + (j >> 1) * s->b8_stride][1];

  1049.                 }

  1050.             } else {

  1051.                 mv_type     = MV_TYPE_16X16;

  1052.                 s->mv[0][0][0] = s->cur_pic->motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][0];

  1053.                 s->mv[0][0][1] = s->cur_pic->motion_val[dir][mb_x * 2 + mb_y * 2 * s->b8_stride][1];

  1054.             }

  1055. 

  1056.             s->decode_mb(s->opaque, 0 /* FIXME h264 partitioned slices need this set */,

  1057.                          mv_dir, mv_type, &s->mv, mb_x, mb_y, 0, 0);

  1058.         }

  1059.     }

  1060. 

  1061.     /* guess MVs */

  1062.     if (s->cur_pic->f.pict_type == AV_PICTURE_TYPE_B) {

  1063.         for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1064.             for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1065.                 int       xy      = mb_x * 2 + mb_y * 2 * s->b8_stride;

  1066.                 const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1067.                 const int mb_type = s->cur_pic->mb_type[mb_xy];

  1068.                 int mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD;

  1069. 

  1070.                 error = s->error_status_table[mb_xy];

  1071. 

  1072.                 if (IS_INTRA(mb_type))

  1073.                     continue;

  1074.                 if (!(error & ER_MV_ERROR))

  1075.                     continue; // inter with undamaged MV

  1076.                 if (!(error & ER_AC_ERROR))

  1077.                     continue; // undamaged inter

  1078. 

  1079.                 if (!(s->last_pic && s->last_pic->f.data[0]))

  1080.                     mv_dir &= ~MV_DIR_FORWARD;

  1081.                 if (!(s->next_pic && s->next_pic->f.data[0]))

  1082.                     mv_dir &= ~MV_DIR_BACKWARD;

  1083. 

  1084.                 if (s->pp_time) {

  1085.                     int time_pp = s->pp_time;

  1086.                     int time_pb = s->pb_time;

  1087. 

  1088.                     ff_thread_await_progress(&s->next_pic->tf, mb_y, 0);

  1089. 

  1090.                     s->mv[0][0][0] = s->next_pic->motion_val[0][xy][0] *  time_pb            / time_pp;

  1091.                     s->mv[0][0][1] = s->next_pic->motion_val[0][xy][1] *  time_pb            / time_pp;

  1092.                     s->mv[1][0][0] = s->next_pic->motion_val[0][xy][0] * (time_pb - time_pp) / time_pp;

  1093.                     s->mv[1][0][1] = s->next_pic->motion_val[0][xy][1] * (time_pb - time_pp) / time_pp;

  1094.                 } else {

  1095.                     s->mv[0][0][0] = 0;

  1096.                     s->mv[0][0][1] = 0;

  1097.                     s->mv[1][0][0] = 0;

  1098.                     s->mv[1][0][1] = 0;

  1099.                 }

  1100. 

  1101.                 s->decode_mb(s->opaque, 0, mv_dir, MV_TYPE_16X16, &s->mv,

  1102.                              mb_x, mb_y, 0, 0);

  1103.             }

  1104.         }

  1105.     } else

  1106.         guess_mv(s);

  1107. 

  1108.     /* the filters below are not XvMC compatible, skip them */

  1109.     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)

  1110.         goto ec_clean;

  1111.     /* fill DC for inter blocks */

  1112.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1113.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1114.             int dc, dcu, dcv, y, n;

  1115.             int16_t *dc_ptr;

  1116.             uint8_t *dest_y, *dest_cb, *dest_cr;

  1117.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1118.             const int mb_type = s->cur_pic->mb_type[mb_xy];

  1119. 

  1120.             error = s->error_status_table[mb_xy];

  1121. 

  1122.             if (IS_INTRA(mb_type) && s->partitioned_frame)

  1123.                 continue;

  1124.             // if (error & ER_MV_ERROR)

  1125.             //     continue; // inter data damaged FIXME is this good?

  1126. 

  1127.             dest_y  = s->cur_pic->f.data[0] + mb_x * 16 + mb_y * 16 * linesize[0];

  1128.             dest_cb = s->cur_pic->f.data[1] + mb_x *  8 + mb_y *  8 * linesize[1];

  1129.             dest_cr = s->cur_pic->f.data[2] + mb_x *  8 + mb_y *  8 * linesize[2];

  1130. 

  1131.             dc_ptr = &s->dc_val[0][mb_x * 2 + mb_y * 2 * s->b8_stride];

  1132.             for (n = 0; n < 4; n++) {

  1133.                 dc = 0;

  1134.                 for (y = 0; y < 8; y++) {

  1135.                     int x;

  1136.                     for (x = 0; x < 8; x++)

  1137.                        dc += dest_y[x + (n & 1) * 8 +

  1138.                              (y + (n >> 1) * 8) * linesize[0]];

  1139.                 }

  1140.                 dc_ptr[(n & 1) + (n >> 1) * s->b8_stride] = (dc + 4) >> 3;

  1141.             }

  1142. 

  1143.             dcu = dcv = 0;

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

  1145.                 int x;

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

  1147.                     dcu += dest_cb[x + y * linesize[1]];

  1148.                     dcv += dest_cr[x + y * linesize[2]];

  1149.                 }

  1150.             }

  1151.             s->dc_val[1][mb_x + mb_y * s->mb_stride] = (dcu + 4) >> 3;

  1152.             s->dc_val[2][mb_x + mb_y * s->mb_stride] = (dcv + 4) >> 3;

  1153.         }

  1154.     }

  1155. 

  1156.     /* guess DC for damaged blocks */

  1157.     guess_dc(s, s->dc_val[0], s->mb_width * 2, s->mb_height * 2, s->b8_stride, 1);

  1158.     guess_dc(s, s->dc_val[1], s->mb_width, s->mb_height, s->mb_stride, 0);

  1159.     guess_dc(s, s->dc_val[2], s->mb_width, s->mb_height, s->mb_stride, 0);

  1160. 

  1161.     /* filter luma DC */

  1162.     filter181(s->dc_val[0], s->mb_width * 2, s->mb_height * 2, s->b8_stride);

  1163. 

  1164.     /* render DC only intra */

  1165.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1166.         for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1167.             uint8_t *dest_y, *dest_cb, *dest_cr;

  1168.             const int mb_xy   = mb_x + mb_y * s->mb_stride;

  1169.             const int mb_type = s->cur_pic->mb_type[mb_xy];

  1170. 

  1171.             error = s->error_status_table[mb_xy];

  1172. 

  1173.             if (IS_INTER(mb_type))

  1174.                 continue;

  1175.             if (!(error & ER_AC_ERROR))

  1176.                 continue; // undamaged

  1177. 

  1178.             dest_y  = s->cur_pic->f.data[0] + mb_x * 16 + mb_y * 16 * linesize[0];

  1179.             dest_cb = s->cur_pic->f.data[1] + mb_x *  8 + mb_y *  8 * linesize[1];

  1180.             dest_cr = s->cur_pic->f.data[2] + mb_x *  8 + mb_y *  8 * linesize[2];

  1181. 

  1182.             put_dc(s, dest_y, dest_cb, dest_cr, mb_x, mb_y);

  1183.         }

  1184.     }

  1185. 

  1186.     if (s->avctx->error_concealment & FF_EC_DEBLOCK) {

  1187.         /* filter horizontal block boundaries */

  1188.         h_block_filter(s, s->cur_pic->f.data[0], s->mb_width * 2,

  1189.                        s->mb_height * 2, linesize[0], 1);

  1190.         h_block_filter(s, s->cur_pic->f.data[1], s->mb_width,

  1191.                        s->mb_height, linesize[1], 0);

  1192.         h_block_filter(s, s->cur_pic->f.data[2], s->mb_width,

  1193.                        s->mb_height, linesize[2], 0);

  1194. 

  1195.         /* filter vertical block boundaries */

  1196.         v_block_filter(s, s->cur_pic->f.data[0], s->mb_width * 2,

  1197.                        s->mb_height * 2, linesize[0], 1);

  1198.         v_block_filter(s, s->cur_pic->f.data[1], s->mb_width,

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

  1200.         v_block_filter(s, s->cur_pic->f.data[2], s->mb_width,

  1201.                        s->mb_height, linesize[2], 0);

  1202.     }

  1203. 

  1204. ec_clean:

  1205.     /* clean a few tables */

  1206.     for (i = 0; i < s->mb_num; i++) {

  1207.         const int mb_xy = s->mb_index2xy[i];

  1208.         int       error = s->error_status_table[mb_xy];

  1209. 

  1210.         if (s->cur_pic->f.pict_type != AV_PICTURE_TYPE_B &&

  1211.             (error & (ER_DC_ERROR | ER_MV_ERROR | ER_AC_ERROR))) {

  1212.             s->mbskip_table[mb_xy] = 0;

  1213.         }

  1214.         s->mbintra_table[mb_xy] = 1;

  1215.     }

  1216.     s->cur_pic = NULL;

  1217.     s->next_pic    = NULL;

  1218.     s->last_pic    = NULL;

  1219. }