FFmpeg
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 "internal.h"
30 #include "libavutil/bprint.h"
31 
32 static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
33 {
34  while (*p) {
35  if (!strncmp(p, "[br]", 4)) {
36  av_bprintf(buf, "\\N");
37  p += 4;
38  } else {
39  if (p[0] == '\n' && p[1])
40  av_bprintf(buf, "\\N");
41  else if (*p != '\n' && *p != '\r')
42  av_bprint_chars(buf, *p, 1);
43  p++;
44  }
45  }
46 
47  return 0;
48 }
49 
51  void *data, int *got_sub_ptr, AVPacket *avpkt)
52 {
53  int ret = 0;
54  AVSubtitle *sub = data;
55  const char *ptr = avpkt->data;
57  AVBPrint buf;
58 
60  if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
61  ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
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  .flush = ff_ass_decoder_flush,
77  .priv_data_size = sizeof(FFASSDecoderContext),
78  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
79 };
AVSubtitle
Definition: avcodec.h:2393
AVCodec
AVCodec.
Definition: codec.h:197
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
ff_ass_subtitle_header_default
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS with default style.
Definition: ass.c:97
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
sub
static float sub(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:32
ff_ass_add_rect
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:118
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
data
const char data[16]
Definition: mxf.c:142
AV_CODEC_ID_SUBVIEWER
@ AV_CODEC_ID_SUBVIEWER
Definition: codec_id.h:535
ass.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
NULL
#define NULL
Definition: coverity.c:32
subviewer_decode_frame
static int subviewer_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: subviewerdec.c:50
AVPacket::size
int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
ff_ass_decoder_flush
void ff_ass_decoder_flush(AVCodecContext *avctx)
Helper to flush a text subtitles decoder making use of the FFASSDecoderContext.
Definition: ass.c:141
bprint.h
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
ff_subviewer_decoder
const AVCodec ff_subviewer_decoder
Definition: subviewerdec.c:69
avcodec.h
ret
ret
Definition: filter_design.txt:187
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
AVCodecContext
main external API structure.
Definition: avcodec.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
AVPacket
This structure stores compressed data.
Definition: packet.h:342
FFASSDecoderContext
Definition: ass.h:46
subviewer_event_to_ass
static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
Definition: subviewerdec.c:32
av_bprint_chars
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140