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  1. /*
  2.  * Mpeg video formats-related defines and utility functions
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <stdint.h>
  22.  
  23. #include "libavutil/common.h"
  24. #include "libavutil/frame.h"
  25. #include "libavutil/pixdesc.h"
  26.  
  27. #include "avcodec.h"
  28. #include "mpegutils.h"
  29.  
  30. void ff_draw_horiz_band(AVCodecContext *avctx,
  31.                         AVFrame *cur, AVFrame *last,
  32.                         int y, int h, int picture_structure,
  33.                         int first_field, int low_delay)
  34. {
  35.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
  36.     int vshift = desc->log2_chroma_h;
  37.     const int field_pic = picture_structure != PICT_FRAME;
  38.     if (field_pic) {
  39.         h <<= 1;
  40.         y <<= 1;
  41.     }
  42.  
  43.     h = FFMIN(h, avctx->height - y);
  44.  
  45.     if (field_pic && first_field &&
  46.         !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
  47.         return;
  48.  
  49.     if (avctx->draw_horiz_band) {
  50.         AVFrame *src;
  51.         int offset[AV_NUM_DATA_POINTERS];
  52.         int i;
  53.  
  54.         if (cur->pict_type == AV_PICTURE_TYPE_B || low_delay ||
  55.            (avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
  56.             src = cur;
  57.         else if (last)
  58.             src = last;
  59.         else
  60.             return;
  61.  
  62.         if (cur->pict_type == AV_PICTURE_TYPE_B &&
  63.             picture_structure == PICT_FRAME &&
  64.             avctx->codec_id != AV_CODEC_ID_SVQ3) {
  65.             for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
  66.                 offset[i] = 0;
  67.         } else {
  68.             offset[0]= y * src->linesize[0];
  69.             offset[1]=
  70.             offset[2]= (y >> vshift) * src->linesize[1];
  71.             for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
  72.                 offset[i] = 0;
  73.         }
  74.  
  75.         emms_c();
  76.  
  77.         avctx->draw_horiz_band(avctx, src, offset,
  78.                                y, picture_structure, h);
  79.     }
  80. }
  81.