FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
subviewerdec.c
Go to the documentation of this file.
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  return 0;
47 }
48 
50  void *data, int *got_sub_ptr, AVPacket *avpkt)
51 {
52  int ret = 0;
53  AVSubtitle *sub = data;
54  const char *ptr = avpkt->data;
56  AVBPrint buf;
57 
59  if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
60  ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
61  av_bprint_finalize(&buf, NULL);
62  if (ret < 0)
63  return ret;
64  *got_sub_ptr = sub->num_rects > 0;
65  return avpkt->size;
66 }
67 
69  .name = "subviewer",
70  .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
71  .type = AVMEDIA_TYPE_SUBTITLE,
73  .decode = subviewer_decode_frame,
75  .flush = ff_ass_decoder_flush,
76  .priv_data_size = sizeof(FFASSDecoderContext),
77 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static int subviewer_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: subviewerdec.c:49
int size
Definition: avcodec.h:1602
unsigned num_rects
Definition: avcodec.h:3961
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:3601
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
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:1601
#define AV_BPRINT_SIZE_UNLIMITED
#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:3608
static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
Definition: subviewerdec.c:31
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1676
void * buf
Definition: avisynth_c.h:690
void ff_ass_decoder_flush(AVCodecContext *avctx)
Helper to flush a text subtitles decoder making use of the FFASSDecoderContext.
Definition: ass.c:124
AVCodec ff_subviewer_decoder
Definition: subviewerdec.c:68
void * priv_data
Definition: avcodec.h:1718
This structure stores compressed data.
Definition: avcodec.h:1578
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140