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  1. /*
  2.  * Copyright (c) 2012 Clément Bœsch
  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. /**
  22.  * @file
  23.  * RealText subtitle decoder
  24.  * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
  25.  */
  26.  
  27. #include "avcodec.h"
  28. #include "ass.h"
  29. #include "libavutil/avstring.h"
  30. #include "libavutil/bprint.h"
  31.  
  32. static int rt_event_to_ass(AVBPrint *buf, const char *p)
  33. {
  34.     int prev_chr_is_space = 1;
  35.  
  36.     while (*p) {
  37.         if (*p != '<') {
  38.             if (!av_isspace(*p))
  39.                 av_bprint_chars(buf, *p, 1);
  40.             else if (!prev_chr_is_space)
  41.                 av_bprint_chars(buf, ' ', 1);
  42.             prev_chr_is_space = av_isspace(*p);
  43.         } else {
  44.             const char *end = strchr(p, '>');
  45.             if (!end)
  46.                 break;
  47.             if (!av_strncasecmp(p, "<br/>", 5) ||
  48.                 !av_strncasecmp(p, "<br>",  4)) {
  49.                 av_bprintf(buf, "\\N");
  50.             }
  51.             p = end;
  52.         }
  53.         p++;
  54.     }
  55.     av_bprintf(buf, "\r\n");
  56.     return 0;
  57. }
  58.  
  59. static int realtext_decode_frame(AVCodecContext *avctx,
  60.                                  void *data, int *got_sub_ptr, AVPacket *avpkt)
  61. {
  62.     AVSubtitle *sub = data;
  63.     const char *ptr = avpkt->data;
  64.     AVBPrint buf;
  65.  
  66.     av_bprint_init(&buf, 0, 4096);
  67.     // note: no need to rescale pts & duration since they are in the same
  68.     // timebase as ASS (1/100)
  69.     if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
  70.         ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0);
  71.     *got_sub_ptr = sub->num_rects > 0;
  72.     av_bprint_finalize(&buf, NULL);
  73.     return avpkt->size;
  74. }
  75.  
  76. AVCodec ff_realtext_decoder = {
  77.     .name           = "realtext",
  78.     .long_name      = NULL_IF_CONFIG_SMALL("RealText subtitle"),
  79.     .type           = AVMEDIA_TYPE_SUBTITLE,
  80.     .id             = AV_CODEC_ID_REALTEXT,
  81.     .decode         = realtext_decode_frame,
  82.     .init           = ff_ass_subtitle_header_default,
  83. };
  84.