FFmpeg
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 "internal.h"
31 #include "libavutil/bprint.h"
32 
33 static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
34 {
35  if (*p == ' ')
36  p++;
37 
38  while (*p) {
39  int got_style = 0;
40 
41  while (*p && strchr("/\\_", *p)) {
42  if (*p == '/') av_bprintf(buf, "{\\i1}");
43  else if (*p == '\\') av_bprintf(buf, "{\\b1}");
44  else if (*p == '_') av_bprintf(buf, "{\\u1}");
45  got_style = 1;
46  p++;
47  }
48 
49  while (*p && *p != '|') {
50  if (*p != '\r' && *p != '\n')
51  av_bprint_chars(buf, *p, 1);
52  p++;
53  }
54 
55  if (*p == '|') {
56  if (got_style)
57  av_bprintf(buf, "{\\r}");
58  av_bprintf(buf, "\\N");
59  p++;
60  }
61  }
62 
63  return 0;
64 }
65 
66 static int mpl2_decode_frame(AVCodecContext *avctx, void *data,
67  int *got_sub_ptr, AVPacket *avpkt)
68 {
69  int ret = 0;
70  AVBPrint buf;
71  AVSubtitle *sub = data;
72  const char *ptr = avpkt->data;
74 
76  if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr))
77  ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
78  av_bprint_finalize(&buf, NULL);
79  if (ret < 0)
80  return ret;
81  *got_sub_ptr = sub->num_rects > 0;
82  return avpkt->size;
83 }
84 
86  .name = "mpl2",
87  .long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitle"),
88  .type = AVMEDIA_TYPE_SUBTITLE,
89  .id = AV_CODEC_ID_MPL2,
90  .decode = mpl2_decode_frame,
92  .flush = ff_ass_decoder_flush,
93  .priv_data_size = sizeof(FFASSDecoderContext),
94  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
95 };
AVSubtitle
Definition: avcodec.h:2284
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:42
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:96
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:234
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:68
sub
static float sub(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:31
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:117
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
ff_mpl2_decoder
const AVCodec ff_mpl2_decoder
Definition: mpl2dec.c:85
data
const char data[16]
Definition: mxf.c:143
AV_CODEC_ID_MPL2
@ AV_CODEC_ID_MPL2
Definition: codec_id.h:540
ass.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
NULL
#define NULL
Definition: coverity.c:32
AVPacket::size
int size
Definition: packet.h:374
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
mpl2_decode_frame
static int mpl2_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: mpl2dec.c:66
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:140
bprint.h
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
avcodec.h
ret
ret
Definition: filter_design.txt:187
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:93
AVCodecContext
main external API structure.
Definition: avcodec.h:379
mpl2_event_to_ass
static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
Definition: mpl2dec.c:33
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:406
AVPacket
This structure stores compressed data.
Definition: packet.h:350
FFASSDecoderContext
Definition: ass.h:46
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:139