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realtextdec.c
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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 
60  void *data, int *got_sub_ptr, AVPacket *avpkt)
61 {
62  int ret = 0;
63  AVSubtitle *sub = data;
64  const char *ptr = avpkt->data;
65  AVBPrint buf;
66 
67  av_bprint_init(&buf, 0, 4096);
68  // note: no need to rescale pts & duration since they are in the same
69  // timebase as ASS (1/100)
70  if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
71  ret = ff_ass_add_rect_bprint(sub, &buf, avpkt->pts, avpkt->duration, 0);
72  av_bprint_finalize(&buf, NULL);
73  if (ret < 0)
74  return ret;
75  *got_sub_ptr = sub->num_rects > 0;
76  return avpkt->size;
77 }
78 
80  .name = "realtext",
81  .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle"),
82  .type = AVMEDIA_TYPE_SUBTITLE,
84  .decode = realtext_decode_frame,
86 };