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  1. /*
  2.  * SAUCE header parser
  3.  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * SAUCE header parser
  25.  */
  26.  
  27. #include "libavutil/intreadwrite.h"
  28. #include "libavutil/dict.h"
  29. #include "avformat.h"
  30. #include "sauce.h"
  31.  
  32. int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height)
  33. {
  34.     AVIOContext *pb = avctx->pb;
  35.     char buf[36];
  36.     int datatype, filetype, t1, t2, nb_comments;
  37.     uint64_t start_pos = avio_size(pb) - 128;
  38.  
  39.     avio_seek(pb, start_pos, SEEK_SET);
  40.     if (avio_read(pb, buf, 7) != 7)
  41.         return -1;
  42.     if (memcmp(buf, "SAUCE00", 7))
  43.         return -1;
  44.  
  45. #define GET_SAUCE_META(name,size) \
  46.     if (avio_read(pb, buf, size) == size && buf[0]) { \
  47.         buf[size] = 0; \
  48.         av_dict_set(&avctx->metadata, name, buf, 0); \
  49.     }
  50.  
  51.     GET_SAUCE_META("title",     35)
  52.     GET_SAUCE_META("artist",    20)
  53.     GET_SAUCE_META("publisher", 20)
  54.     GET_SAUCE_META("date",      8)
  55.     avio_skip(pb, 4);
  56.     datatype    = avio_r8(pb);
  57.     filetype    = avio_r8(pb);
  58.     t1          = avio_rl16(pb);
  59.     t2          = avio_rl16(pb);
  60.     nb_comments = avio_r8(pb);
  61.     avio_skip(pb, 1); /* flags */
  62.     avio_skip(pb, 4);
  63.     GET_SAUCE_META("encoder",   22);
  64.  
  65.     if (got_width && datatype && filetype) {
  66.         if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) {
  67.             if (t1) {
  68.                 avctx->streams[0]->codec->width = t1<<3;
  69.                 *got_width = 1;
  70.             }
  71.             if (get_height && t2)
  72.                 avctx->streams[0]->codec->height = t2<<4;
  73.         } else if (datatype == 5) {
  74.             if (filetype) {
  75.                 avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4;
  76.                 *got_width = 1;
  77.             }
  78.             if (get_height && t2)
  79.                 avctx->streams[0]->codec->height = t2<<4;
  80.         }
  81.     }
  82.  
  83.     *fsize -= 128;
  84.  
  85.     if (nb_comments > 0) {
  86.         avio_seek(pb, start_pos - 64*nb_comments - 5, SEEK_SET);
  87.         if (avio_read(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) {
  88.             int i;
  89.             char *str = av_malloc(65*nb_comments + 1);
  90.             *fsize -= 64*nb_comments + 5;
  91.             if (!str)
  92.                 return 0;
  93.             for (i = 0; i < nb_comments; i++) {
  94.                 if (avio_read(pb, str + 65*i, 64) != 64)
  95.                     break;
  96.                 str[65*i + 64] = '\n';
  97.             }
  98.             str[65*i] = 0;
  99.             av_dict_set(&avctx->metadata, "comment", str, AV_DICT_DONT_STRDUP_VAL);
  100.         }
  101.     }
  102.  
  103.     return 0;
  104. }
  105.