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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. #include "error_resilience.h"
  20. #include "mpegvideo.h"
  21. #include "mpeg_er.h"
  22.  
  23. static void set_erpic(ERPicture *dst, Picture *src)
  24. {
  25.     int i;
  26.  
  27.     memset(dst, 0, sizeof(*dst));
  28.     if (!src) {
  29.         dst->f  = NULL;
  30.         dst->tf = NULL;
  31.         return;
  32.     }
  33.  
  34.     dst->f = src->f;
  35.     dst->tf = &src->tf;
  36.  
  37.     for (i = 0; i < 2; i++) {
  38.         dst->motion_val[i] = src->motion_val[i];
  39.         dst->ref_index[i] = src->ref_index[i];
  40.     }
  41.  
  42.     dst->mb_type = src->mb_type;
  43.     dst->field_picture = src->field_picture;
  44. }
  45.  
  46. void ff_mpeg_er_frame_start(MpegEncContext *s)
  47. {
  48.     ERContext *er = &s->er;
  49.  
  50.     set_erpic(&er->cur_pic,  s->current_picture_ptr);
  51.     set_erpic(&er->next_pic, s->next_picture_ptr);
  52.     set_erpic(&er->last_pic, s->last_picture_ptr);
  53.  
  54.     er->pp_time           = s->pp_time;
  55.     er->pb_time           = s->pb_time;
  56.     er->quarter_sample    = s->quarter_sample;
  57.     er->partitioned_frame = s->partitioned_frame;
  58.  
  59.     ff_er_frame_start(er);
  60. }
  61.  
  62. static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
  63.                               int (*mv)[2][4][2], int mb_x, int mb_y,
  64.                               int mb_intra, int mb_skipped)
  65. {
  66.     MpegEncContext *s = opaque;
  67.  
  68.     s->mv_dir     = mv_dir;
  69.     s->mv_type    = mv_type;
  70.     s->mb_intra   = mb_intra;
  71.     s->mb_skipped = mb_skipped;
  72.     s->mb_x       = mb_x;
  73.     s->mb_y       = mb_y;
  74.     memcpy(s->mv, mv, sizeof(*mv));
  75.  
  76.     ff_init_block_index(s);
  77.     ff_update_block_index(s);
  78.  
  79.     s->bdsp.clear_blocks(s->block[0]);
  80.  
  81.     s->dest[0] = s->current_picture.f->data[0] +
  82.                  s->mb_y * 16 * s->linesize +
  83.                  s->mb_x * 16;
  84.     s->dest[1] = s->current_picture.f->data[1] +
  85.                  s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
  86.                  s->mb_x * (16 >> s->chroma_x_shift);
  87.     s->dest[2] = s->current_picture.f->data[2] +
  88.                  s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
  89.                  s->mb_x * (16 >> s->chroma_x_shift);
  90.  
  91.     if (ref)
  92.         av_log(s->avctx, AV_LOG_DEBUG,
  93.                "Interlaced error concealment is not fully implemented\n");
  94.     ff_mpv_decode_mb(s, s->block);
  95. }
  96.  
  97. int ff_mpeg_er_init(MpegEncContext *s)
  98. {
  99.     ERContext *er = &s->er;
  100.     int mb_array_size = s->mb_height * s->mb_stride;
  101.     int i;
  102.  
  103.     er->avctx       = s->avctx;
  104.  
  105.     er->mb_index2xy = s->mb_index2xy;
  106.     er->mb_num      = s->mb_num;
  107.     er->mb_width    = s->mb_width;
  108.     er->mb_height   = s->mb_height;
  109.     er->mb_stride   = s->mb_stride;
  110.     er->b8_stride   = s->b8_stride;
  111.  
  112.     er->er_temp_buffer     = av_malloc(s->mb_height * s->mb_stride);
  113.     er->error_status_table = av_mallocz(mb_array_size);
  114.     if (!er->er_temp_buffer || !er->error_status_table)
  115.         goto fail;
  116.  
  117.     er->mbskip_table  = s->mbskip_table;
  118.     er->mbintra_table = s->mbintra_table;
  119.  
  120.     for (i = 0; i < FF_ARRAY_ELEMS(s->dc_val); i++)
  121.         er->dc_val[i] = s->dc_val[i];
  122.  
  123.     er->decode_mb = mpeg_er_decode_mb;
  124.     er->opaque    = s;
  125.  
  126.     return 0;
  127. fail:
  128.     av_freep(&er->er_temp_buffer);
  129.     av_freep(&er->error_status_table);
  130.     return AVERROR(ENOMEM);
  131. }
  132.