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  1. /*
  2.  * RAW dvbsub demuxer
  3.  * Copyright (c) 2015 Michael Niedermayer <michaelni@gmx.at>
  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. #include "libavutil/intreadwrite.h"
  23.  
  24. #include "avformat.h"
  25. #include "rawdec.h"
  26.  
  27.  
  28. static int dvbsub_probe(AVProbeData *p)
  29. {
  30.     int i, j, k;
  31.     const uint8_t *end = p->buf + p->buf_size;
  32.     int type, len;
  33.     int max_score = 0;
  34.  
  35.     for(i=0; i<p->buf_size; i++){
  36.         if (p->buf[i] == 0x0f) {
  37.             const uint8_t *ptr = p->buf + i;
  38.             uint8_t histogram[6] = {0};
  39.             int min = 255;
  40.             for(j=0; 6 < end - ptr; j++) {
  41.                 if (*ptr != 0x0f)
  42.                     break;
  43.                 type    = ptr[1];
  44.                 //page_id = AV_RB16(ptr + 2);
  45.                 len     = AV_RB16(ptr + 4);
  46.                 if (type == 0x80) {
  47.                     ;
  48.                 } else if (type >= 0x10 && type <= 0x14) {
  49.                     histogram[type - 0x10] ++;
  50.                 } else
  51.                     break;
  52.                 if (6 + len > end - ptr)
  53.                     break;
  54.                 ptr += 6 + len;
  55.             }
  56.             for (k=0; k < 4; k++) {
  57.                 min = FFMIN(min, histogram[k]);
  58.             }
  59.             if (min && j > max_score)
  60.                 max_score = j;
  61.         }
  62.     }
  63.  
  64.     if (max_score > 5)
  65.         return AVPROBE_SCORE_EXTENSION;
  66.  
  67.     return 0;
  68. }
  69.  
  70. FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX)
  71.