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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  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;
55  AVBPrint buf;
56 
58  // note: no need to rescale pts & duration since they are in the same
59  // timebase as ASS (1/100)
60  if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
61  ret = ff_ass_add_rect_bprint(sub, &buf, avpkt->pts, avpkt->duration);
62  av_bprint_finalize(&buf, NULL);
63  if (ret < 0)
64  return ret;
65  *got_sub_ptr = sub->num_rects > 0;
66  return avpkt->size;
67 }
68 
70  .name = "subviewer",
71  .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
72  .type = AVMEDIA_TYPE_SUBTITLE,
74  .decode = subviewer_decode_frame,
76 };
#define NULL
Definition: coverity.c:32
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:1174
unsigned num_rects
Definition: avcodec.h:3536
AVCodec.
Definition: avcodec.h:3206
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:1173
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1191
#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:175
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:3213
Libavcodec external API header.
static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
Definition: subviewerdec.c:31
ret
Definition: avfilter.c:974
int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf, int ts_start, int duration)
Same as ff_ass_add_rect_bprint, but taking an AVBPrint buffer instead of a string, and assuming raw=0.
Definition: ass.c:178
main external API structure.
Definition: avcodec.h:1252
void * buf
Definition: avisynth_c.h:553
AVCodec ff_subviewer_decoder
Definition: subviewerdec.c:69
This structure stores compressed data.
Definition: avcodec.h:1150
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1166
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140