blob: 35de49322c0c8ae2d2783d910d06f9d3f43592a6
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->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
81 | st->codecpar->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(s, &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 | }; |
142 |