FFmpeg
Main Page
Related Pages
Modules
Namespaces
Data Structures
Files
Examples
File List
Globals
All
Data Structures
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Macros
Groups
Pages
libavformat
stldec.c
Go to the documentation of this file.
1
/*
2
* Copyright (c) 2014 Eejya Singh
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
* STL subtitles format demuxer
24
* @see https://documentation.apple.com/en/dvdstudiopro/usermanual/index.html#chapter=19%26section=13%26tasks=true
25
*/
26
27
#include "
avformat.h
"
28
#include "
internal.h
"
29
#include "
subtitles.h
"
30
#include "
libavutil/intreadwrite.h
"
31
#include "
libavutil/avstring.h
"
32
33
typedef
struct
{
34
FFDemuxSubtitlesQueue
q
;
35
}
STLContext
;
36
37
static
int
stl_probe
(
AVProbeData
*p)
38
{
39
char
c
;
40
const
unsigned
char
*ptr = p->
buf
;
41
42
if
(
AV_RB24
(ptr) == 0xEFBBBF)
43
ptr += 3;
/* skip UTF-8 BOM */
44
45
while
(*ptr ==
'\r'
|| *ptr ==
'\n'
|| *ptr ==
'$'
|| !strncmp(ptr,
"//"
, 2))
46
ptr +=
ff_subtitles_next_line
(ptr);
47
48
if
(sscanf(ptr,
"%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d , %c"
, &c) == 1)
49
return
AVPROBE_SCORE_MAX
;
50
51
return
0;
52
}
53
54
static
int64_t
get_pts
(
char
**
buf
,
int
*
duration
)
55
{
56
int
hh1, mm1, ss1, ms1;
57
int
hh2, mm2, ss2, ms2;
58
int
len
= 0;
59
60
if
(sscanf(*buf,
"%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , %n"
,
61
&hh1, &mm1, &ss1, &ms1,
62
&hh2, &mm2, &ss2, &ms2, &len) >= 8 && len > 0) {
63
int64_t
start
= (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
64
int64_t
end
= (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
65
*duration = end -
start
;
66
*buf +=
len
;
67
return
start
;
68
}
69
return
AV_NOPTS_VALUE
;
70
}
71
72
static
int
stl_read_header
(
AVFormatContext
*
s
)
73
{
74
STLContext
*
stl
= s->
priv_data
;
75
AVStream
*st =
avformat_new_stream
(s,
NULL
);
76
77
if
(!st)
78
return
AVERROR
(ENOMEM);
79
avpriv_set_pts_info
(st, 64, 1, 100);
80
st->
codec
->
codec_type
=
AVMEDIA_TYPE_SUBTITLE
;
81
st->
codec
->
codec_id
=
AV_CODEC_ID_STL
;
82
83
while
(!
avio_feof
(s->
pb
)) {
84
char
line
[4096];
85
char
*p = line;
86
const
int64_t pos =
avio_tell
(s->
pb
);
87
int
len
=
ff_get_line
(s->
pb
, line,
sizeof
(line));
88
int64_t pts_start;
89
int
duration
;
90
91
if
(!len)
92
break
;
93
94
line[strcspn(line,
"\r\n"
)] = 0;
95
pts_start =
get_pts
(&p , &duration);
96
97
if
(pts_start !=
AV_NOPTS_VALUE
) {
98
AVPacket
*sub;
99
sub =
ff_subtitles_queue_insert
(&stl->
q
, p, strlen(p), 0);
100
if
(!sub)
101
return
AVERROR
(ENOMEM);
102
sub->
pos
= pos;
103
sub->
pts
= pts_start;
104
sub->
duration
=
duration
;
105
}
106
}
107
ff_subtitles_queue_finalize
(&stl->
q
);
108
return
0;
109
}
110
static
int
stl_read_packet
(
AVFormatContext
*
s
,
AVPacket
*
pkt
)
111
{
112
STLContext
*
stl
= s->
priv_data
;
113
return
ff_subtitles_queue_read_packet
(&stl->
q
, pkt);
114
}
115
116
static
int
stl_read_seek
(
AVFormatContext
*
s
,
int
stream_index,
117
int64_t min_ts, int64_t ts, int64_t max_ts,
int
flags
)
118
{
119
STLContext
*
stl
= s->
priv_data
;
120
return
ff_subtitles_queue_seek
(&stl->
q
, s, stream_index,
121
min_ts, ts, max_ts, flags);
122
}
123
124
static
int
stl_read_close
(
AVFormatContext
*
s
)
125
{
126
STLContext
*
stl
= s->
priv_data
;
127
ff_subtitles_queue_clean
(&stl->
q
);
128
return
0;
129
}
130
131
AVInputFormat
ff_stl_demuxer
= {
132
.
name
=
"stl"
,
133
.long_name =
NULL_IF_CONFIG_SMALL
(
"Spruce subtitle format"
),
134
.priv_data_size =
sizeof
(
STLContext
),
135
.
read_probe
=
stl_probe
,
136
.
read_header
=
stl_read_header
,
137
.
read_packet
=
stl_read_packet
,
138
.read_seek2 =
stl_read_seek
,
139
.
read_close
=
stl_read_close
,
140
.extensions =
"stl"
,
141
};
Generated on Sun Mar 8 2015 02:35:12 for FFmpeg by
1.8.2