blob: f0e840b0f7eb71797e9776c20b63f744a0d1d289
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 | * AQTitle subtitles format demuxer |
24 | * |
25 | * @see http://web.archive.org/web/20070210095721/http://www.volny.cz/aberka/czech/aqt.html |
26 | * @see https://trac.annodex.net/wiki/AQTitle |
27 | */ |
28 | |
29 | #include "avformat.h" |
30 | #include "internal.h" |
31 | #include "subtitles.h" |
32 | #include "libavutil/opt.h" |
33 | |
34 | typedef struct { |
35 | const AVClass *class; |
36 | FFDemuxSubtitlesQueue q; |
37 | AVRational frame_rate; |
38 | } AQTitleContext; |
39 | |
40 | static int aqt_probe(AVProbeData *p) |
41 | { |
42 | int frame; |
43 | const char *ptr = p->buf; |
44 | |
45 | if (sscanf(ptr, "-->> %d", &frame) == 1) |
46 | return AVPROBE_SCORE_EXTENSION; |
47 | return 0; |
48 | } |
49 | |
50 | static int aqt_read_header(AVFormatContext *s) |
51 | { |
52 | AQTitleContext *aqt = s->priv_data; |
53 | AVStream *st = avformat_new_stream(s, NULL); |
54 | int new_event = 1; |
55 | int64_t pos = 0, frame = AV_NOPTS_VALUE; |
56 | AVPacket *sub = NULL; |
57 | |
58 | if (!st) |
59 | return AVERROR(ENOMEM); |
60 | avpriv_set_pts_info(st, 64, aqt->frame_rate.den, aqt->frame_rate.num); |
61 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
62 | st->codecpar->codec_id = AV_CODEC_ID_TEXT; |
63 | |
64 | while (!avio_feof(s->pb)) { |
65 | char line[4096]; |
66 | int len = ff_get_line(s->pb, line, sizeof(line)); |
67 | |
68 | if (!len) |
69 | break; |
70 | |
71 | line[strcspn(line, "\r\n")] = 0; |
72 | |
73 | if (sscanf(line, "-->> %"SCNd64, &frame) == 1) { |
74 | new_event = 1; |
75 | pos = avio_tell(s->pb); |
76 | if (sub) { |
77 | sub->duration = frame - sub->pts; |
78 | sub = NULL; |
79 | } |
80 | } else if (*line) { |
81 | if (!new_event) { |
82 | sub = ff_subtitles_queue_insert(&aqt->q, "\n", 1, 1); |
83 | if (!sub) |
84 | return AVERROR(ENOMEM); |
85 | } |
86 | sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event); |
87 | if (!sub) |
88 | return AVERROR(ENOMEM); |
89 | if (new_event) { |
90 | sub->pts = frame; |
91 | sub->duration = -1; |
92 | sub->pos = pos; |
93 | } |
94 | new_event = 0; |
95 | } |
96 | } |
97 | |
98 | ff_subtitles_queue_finalize(s, &aqt->q); |
99 | return 0; |
100 | } |
101 | |
102 | static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt) |
103 | { |
104 | AQTitleContext *aqt = s->priv_data; |
105 | return ff_subtitles_queue_read_packet(&aqt->q, pkt); |
106 | } |
107 | |
108 | static int aqt_read_seek(AVFormatContext *s, int stream_index, |
109 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
110 | { |
111 | AQTitleContext *aqt = s->priv_data; |
112 | return ff_subtitles_queue_seek(&aqt->q, s, stream_index, |
113 | min_ts, ts, max_ts, flags); |
114 | } |
115 | |
116 | static int aqt_read_close(AVFormatContext *s) |
117 | { |
118 | AQTitleContext *aqt = s->priv_data; |
119 | ff_subtitles_queue_clean(&aqt->q); |
120 | return 0; |
121 | } |
122 | |
123 | #define OFFSET(x) offsetof(AQTitleContext, x) |
124 | #define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM |
125 | static const AVOption aqt_options[] = { |
126 | { "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD }, |
127 | { NULL } |
128 | }; |
129 | |
130 | static const AVClass aqt_class = { |
131 | .class_name = "aqtdec", |
132 | .item_name = av_default_item_name, |
133 | .option = aqt_options, |
134 | .version = LIBAVUTIL_VERSION_INT, |
135 | }; |
136 | |
137 | AVInputFormat ff_aqtitle_demuxer = { |
138 | .name = "aqtitle", |
139 | .long_name = NULL_IF_CONFIG_SMALL("AQTitle subtitles"), |
140 | .priv_data_size = sizeof(AQTitleContext), |
141 | .read_probe = aqt_probe, |
142 | .read_header = aqt_read_header, |
143 | .read_packet = aqt_read_packet, |
144 | .read_seek2 = aqt_read_seek, |
145 | .read_close = aqt_read_close, |
146 | .extensions = "aqt", |
147 | .priv_class = &aqt_class, |
148 | }; |
149 |