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subviewerdec.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  * SubViewer subtitle decoder
24  * @see https://en.wikipedia.org/wiki/SubViewer
25  */
26 
27 #include "avcodec.h"
28 #include "ass.h"
29 #include "libavutil/bprint.h"
30 
31 static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
32 {
33  while (*p) {
34  if (!strncmp(p, "[br]", 4)) {
35  av_bprintf(buf, "\\N");
36  p += 4;
37  } else {
38  if (p[0] == '\n' && p[1])
39  av_bprintf(buf, "\\N");
40  else if (*p != '\n' && *p != '\r')
41  av_bprint_chars(buf, *p, 1);
42  p++;
43  }
44  }
45 
46  av_bprintf(buf, "\r\n");
47  return 0;
48 }
49 
51  void *data, int *got_sub_ptr, AVPacket *avpkt)
52 {
53  char c;
54  AVSubtitle *sub = data;
55  const char *ptr = avpkt->data;
56  AVBPrint buf;
57 
58  /* To be removed later */
59  if (ptr && sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) {
60  av_log(avctx, AV_LOG_ERROR, "AVPacket is not clean (contains timing "
61  "information). You need to upgrade your libavformat or "
62  "sanitize your packet.\n");
63  return AVERROR_INVALIDDATA;
64  }
65 
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 && !subviewer_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 
77  .name = "subviewer",
78  .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
79  .type = AVMEDIA_TYPE_SUBTITLE,
81  .decode = subviewer_decode_frame,
83 };