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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 | }; |