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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;
72  const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100});
73  const int ts_duration = avpkt->duration != -1 ?
74  av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
75 
77  if (ptr && avpkt->size > 0 && *ptr && !mpl2_event_to_ass(&buf, ptr))
78  ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_duration);
80  if (ret < 0)
81  return ret;
82  *got_sub_ptr = sub->num_rects > 0;
83  return avpkt->size;
84 }
85 
87  .name = "mpl2",
88  .long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitle"),
89  .type = AVMEDIA_TYPE_SUBTITLE,
90  .id = AV_CODEC_ID_MPL2,
91  .decode = mpl2_decode_frame,
93 };
#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
AVCodec.
Definition: avcodec.h:3392
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1661
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:1467
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#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:3399
static int mpl2_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt)
Definition: mpl2dec.c:65
Libavcodec external API header.
int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf, int ts_start, int duration)
Same as ff_ass_add_rect, but taking an AVBPrint buffer instead of a string, and assuming raw=0...
Definition: ass.c:181
main external API structure.
Definition: avcodec.h:1532
void * buf
Definition: avisynth_c.h:553
rational number numerator/denominator
Definition: rational.h:43
AVCodec ff_mpl2_decoder
Definition: mpl2dec.c:86
static int mpl2_event_to_ass(AVBPrint *buf, const char *p)
Definition: mpl2dec.c:32
This structure stores compressed data.
Definition: avcodec.h:1444
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1460
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140