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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 "libavutil/bprint.h"
31 
32 static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
33 {
34  if (*p == ' ')
35  p++;
36 
37  while (*p) {
38  int got_style = 0;
39 
40  while (*p && strchr("/\\_", *p)) {
41  if (*p == '/') av_bprintf(buf, "{\\i1}");
42  else if (*p == '\\') av_bprintf(buf, "{\\b1}");
43  else if (*p == '_') av_bprintf(buf, "{\\u1}");
44  got_style = 1;
45  p++;
46  }
47 
48  while (*p && *p != '|') {
49  if (*p != '\r' && *p != '\n')
50  av_bprint_chars(buf, *p, 1);
51  p++;
52  }
53 
54  if (*p == '|') {
55  if (got_style)
56  av_bprintf(buf, "{\\r}");
57  av_bprintf(buf, "\\N");
58  p++;
59  }
60  }
61 
62  return 0;
63 }
64 
65 static int mpl2_decode_frame(AVCodecContext *avctx, void *data,
66  int *got_sub_ptr, AVPacket *avpkt)
67 {
68  int ret = 0;
69  AVBPrint buf;
70  AVSubtitle *sub = data;
71  const char *ptr = avpkt->data;
73 
75  if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr))
76  ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
77  av_bprint_finalize(&buf, NULL);
78  if (ret < 0)
79  return ret;
80  *got_sub_ptr = sub->num_rects > 0;
81  return avpkt->size;
82 }
83 
85  .name = "mpl2",
86  .long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitle"),
87  .type = AVMEDIA_TYPE_SUBTITLE,
88  .id = AV_CODEC_ID_MPL2,
89  .decode = mpl2_decode_frame,
91  .flush = ff_ass_decoder_flush,
92  .priv_data_size = sizeof(FFASSDecoderContext),
93 };
#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:1575
unsigned num_rects
Definition: avcodec.h:3891
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:3531
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:1574
#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:3538
static int mpl2_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: mpl2dec.c:65
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1639
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
AVCodec ff_mpl2_decoder
Definition: mpl2dec.c:84
void * priv_data
Definition: avcodec.h:1681
static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
Definition: mpl2dec.c:32
This structure stores compressed data.
Definition: avcodec.h:1551
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140