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mpl2dec.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  * MPL2 subtitles decoder
24  *
25  * @see http://web.archive.org/web/20090328040233/http://napisy.ussbrowarek.org/mpl2-eng.html
26  */
27 
28 #include "avcodec.h"
29 #include "ass.h"
30 #include "libavutil/bprint.h"
31 
32 static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
33 {
34  if (*p == ' ')
35  p++;
36 
37  while (*p) {
38  int got_style = 0;
39 
40  while (*p && strchr("/\\_", *p)) {
41  if (*p == '/') av_bprintf(buf, "{\\i1}");
42  else if (*p == '\\') av_bprintf(buf, "{\\b1}");
43  else if (*p == '_') av_bprintf(buf, "{\\u1}");
44  got_style = 1;
45  p++;
46  }
47 
48  while (*p && *p != '|') {
49  if (*p != '\r' && *p != '\n')
50  av_bprint_chars(buf, *p, 1);
51  p++;
52  }
53 
54  if (*p == '|') {
55  if (got_style)
56  av_bprintf(buf, "{\\r}");
57  av_bprintf(buf, "\\N");
58  p++;
59  }
60  }
61 
62  return 0;
63 }
64 
65 static int mpl2_decode_frame(AVCodecContext *avctx, void *data,
66  int *got_sub_ptr, AVPacket *avpkt)
67 {
68  int ret = 0;
69  AVBPrint buf;
70  AVSubtitle *sub = data;
71  const char *ptr = avpkt->data;
72  const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100});
73  const int ts_duration = avpkt->duration != -1 ?
74  av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
75 
77  if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr))
78  ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_duration);
79  av_bprint_finalize(&buf, NULL);
80  if (ret < 0)
81  return ret;
82  *got_sub_ptr = sub->num_rects > 0;
83  return avpkt->size;
84 }
85 
87  .name = "mpl2",
88  .long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitle"),
89  .type = AVMEDIA_TYPE_SUBTITLE,
90  .id = AV_CODEC_ID_MPL2,
91  .decode = mpl2_decode_frame,
93 };