libavcodec/mpeg_er.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav 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  * Libav 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 Libav; 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     if (!src) {
  28         dst->f  = NULL;
  29         dst->tf = NULL;
  30         return;
  31     }
  32
  33     dst->f = src->f;
  34     dst->tf = &src->tf;
  35
  36     for (i = 0; i < 2; i++) {
  37         dst->motion_val[i] = src->motion_val[i];
  38         dst->ref_index[i] = src->ref_index[i];
  39     }
  40
  41     dst->mb_type = src->mb_type;
  42     dst->field_picture = src->field_picture;
  43 }
  44
  45 void ff_mpeg_er_frame_start(MpegEncContext *s)
  46 {
  47     ERContext *er = &s->er;
  48
  49     set_erpic(&er->cur_pic,  s->current_picture_ptr);
  50     set_erpic(&er->next_pic, s->next_picture_ptr);
  51     set_erpic(&er->last_pic, s->last_picture_ptr);
  52
  53     er->pp_time           = s->pp_time;
  54     er->pb_time           = s->pb_time;
  55     er->quarter_sample    = s->quarter_sample;
  56     er->partitioned_frame = s->partitioned_frame;
  57
  58     ff_er_frame_start(er);
  59 }
  60
  61 static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
  62                               int (*mv)[2][4][2], int mb_x, int mb_y,
  63                               int mb_intra, int mb_skipped)
  64 {
  65     MpegEncContext *s = opaque;
  66
  67     s->mv_dir     = mv_dir;
  68     s->mv_type    = mv_type;
  69     s->mb_intra   = mb_intra;
  70     s->mb_skipped = mb_skipped;
  71     s->mb_x       = mb_x;
  72     s->mb_y       = mb_y;
  73     memcpy(s->mv, mv, sizeof(*mv));
  74
  75     ff_init_block_index(s);
  76     ff_update_block_index(s);
  77
  78     s->bdsp.clear_blocks(s->block[0]);
  79
  80     s->dest[0] = s->current_picture.f->data[0] +
  81                  s->mb_y * 16 * s->linesize +
  82                  s->mb_x * 16;
  83     s->dest[1] = s->current_picture.f->data[1] +
  84                  s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
  85                  s->mb_x * (16 >> s->chroma_x_shift);
  86     s->dest[2] = s->current_picture.f->data[2] +
  87                  s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
  88                  s->mb_x * (16 >> s->chroma_x_shift);
  89
  90     if (ref)
  91         av_log(s->avctx, AV_LOG_DEBUG,
  92                "Interlaced error concealment is not fully implemented\n");
  93     ff_mpv_decode_mb(s, s->block);
  94 }
  95
  96 int ff_mpeg_er_init(MpegEncContext *s)
  97 {
  98     ERContext *er = &s->er;
  99     int mb_array_size = s->mb_height * s->mb_stride;
 100     int i;
 101
 102     er->avctx       = s->avctx;
 103
 104     er->mb_index2xy = s->mb_index2xy;
 105     er->mb_num      = s->mb_num;
 106     er->mb_width    = s->mb_width;
 107     er->mb_height   = s->mb_height;
 108     er->mb_stride   = s->mb_stride;
 109     er->b8_stride   = s->b8_stride;
 110
 111     er->er_temp_buffer     = av_malloc(s->mb_height * s->mb_stride);
 112     er->error_status_table = av_mallocz(mb_array_size);
 113     if (!er->er_temp_buffer || !er->error_status_table)
 114         goto fail;
 115
 116     er->mbskip_table  = s->mbskip_table;
 117     er->mbintra_table = s->mbintra_table;
 118
 119     for (i = 0; i < FF_ARRAY_ELEMS(s->dc_val); i++)
 120         er->dc_val[i] = s->dc_val[i];
 121
 122     er->decode_mb = mpeg_er_decode_mb;
 123     er->opaque    = s;
 124
 125     return 0;
 126 fail:
 127     av_freep(&er->er_temp_buffer);
 128     av_freep(&er->error_status_table);
 129     return AVERROR(ENOMEM);
 130 }