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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  return 0;
56 }
57 
59  void *data, int *got_sub_ptr, AVPacket *avpkt)
60 {
61  int ret = 0;
62  AVSubtitle *sub = data;
63  const char *ptr = avpkt->data;
65  AVBPrint buf;
66 
67  av_bprint_init(&buf, 0, 4096);
68  if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
69  ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
70  av_bprint_finalize(&buf, NULL);
71  if (ret < 0)
72  return ret;
73  *got_sub_ptr = sub->num_rects > 0;
74  return avpkt->size;
75 }
76 
78  .name = "realtext",
79  .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle"),
80  .type = AVMEDIA_TYPE_SUBTITLE,
82  .decode = realtext_decode_frame,
84  .flush = ff_ass_decoder_flush,
85  .priv_data_size = sizeof(FFASSDecoderContext),
86 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int size
Definition: avcodec.h:1589
static av_const int av_isspace(int c)
Locale-independent conversion of ASCII isspace.
Definition: avstring.h:222
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
Definition: avstring.c:223
unsigned num_rects
Definition: avcodec.h:3919
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, int readorder, int layer, const char *style, const char *speaker)
Add an ASS dialog to a subtitle.
Definition: ass.c:101
AVCodec.
Definition: avcodec.h:3559
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS with default style.
Definition: ass.c:80
uint8_t * data
Definition: avcodec.h:1588
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
const char * name
Name of the codec implementation.
Definition: avcodec.h:3566
AVCodec ff_realtext_decoder
Definition: realtextdec.c:77
static int realtext_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: realtextdec.c:58
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1657
void * buf
Definition: avisynth_c.h:553
void ff_ass_decoder_flush(AVCodecContext *avctx)
Helper to flush a text subtitles decoder making use of the FFASSDecoderContext.
Definition: ass.c:124
static int rt_event_to_ass(AVBPrint *buf, const char *p)
Definition: realtextdec.c:32
void * priv_data
Definition: avcodec.h:1699
This structure stores compressed data.
Definition: avcodec.h:1565
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140