1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* Copyright (c) 2014 Eejya Singh
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* STL subtitles format demuxer
* @see https://documentation.apple.com/en/dvdstudiopro/usermanual/index.html#chapter=19%26section=13%26tasks=true
*/
#include "avformat.h"
#include "internal.h"
#include "subtitles.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
typedef struct {
FFDemuxSubtitlesQueue q;
} STLContext;
static int stl_probe(const AVProbeData *p)
{
char c;
const unsigned char *ptr = p->buf;
if (AV_RB24(ptr) == 0xEFBBBF)
ptr += 3; /* skip UTF-8 BOM */
while (*ptr == '\r' || *ptr == '\n' || *ptr == '$' || !strncmp(ptr, "//" , 2))
ptr += ff_subtitles_next_line(ptr);
if (sscanf(ptr, "%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d , %c", &c) == 1)
return AVPROBE_SCORE_MAX;
return 0;
}
static int64_t get_pts(char **buf, int *duration)
{
int hh1, mm1, ss1, ms1;
int hh2, mm2, ss2, ms2;
int len = 0;
if (sscanf(*buf, "%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , %n",
&hh1, &mm1, &ss1, &ms1,
&hh2, &mm2, &ss2, &ms2, &len) >= 8 && len > 0) {
int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
*duration = end - start;
*buf += len;
return start;
}
return AV_NOPTS_VALUE;
}
static int stl_read_header(AVFormatContext *s)
{
STLContext *stl = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 100);
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = AV_CODEC_ID_STL;
while (!avio_feof(s->pb)) {
char line[4096];
char *p = line;
const int64_t pos = avio_tell(s->pb);
int len = ff_get_line(s->pb, line, sizeof(line));
int64_t pts_start;
int duration;
if (!len)
break;
line[strcspn(line, "\r\n")] = 0;
pts_start = get_pts(&p , &duration);
if (pts_start != AV_NOPTS_VALUE) {
AVPacket *sub;
sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0);
if (!sub) {
ff_subtitles_queue_clean(&stl->q);
return AVERROR(ENOMEM);
}
sub->pos = pos;
sub->pts = pts_start;
sub->duration = duration;
}
}
ff_subtitles_queue_finalize(s, &stl->q);
return 0;
}
static int stl_read_packet(AVFormatContext *s, AVPacket *pkt)
{
STLContext *stl = s->priv_data;
return ff_subtitles_queue_read_packet(&stl->q, pkt);
}
static int stl_read_seek(AVFormatContext *s, int stream_index,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
STLContext *stl = s->priv_data;
return ff_subtitles_queue_seek(&stl->q, s, stream_index,
min_ts, ts, max_ts, flags);
}
static int stl_read_close(AVFormatContext *s)
{
STLContext *stl = s->priv_data;
ff_subtitles_queue_clean(&stl->q);
return 0;
}
AVInputFormat ff_stl_demuxer = {
.name = "stl",
.long_name = NULL_IF_CONFIG_SMALL("Spruce subtitle format"),
.priv_data_size = sizeof(STLContext),
.read_probe = stl_probe,
.read_header = stl_read_header,
.read_packet = stl_read_packet,
.read_seek2 = stl_read_seek,
.read_close = stl_read_close,
.extensions = "stl",
};
|
