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
aqt_probe(const AVProbeData * p)40 static int aqt_probe(const 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
aqt_read_header(AVFormatContext * s)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 goto fail;
85 }
86 sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event);
87 if (!sub)
88 goto fail;
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 fail:
101 ff_subtitles_queue_clean(&aqt->q);
102 return AVERROR(ENOMEM);
103 }
104
aqt_read_packet(AVFormatContext * s,AVPacket * pkt)105 static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt)
106 {
107 AQTitleContext *aqt = s->priv_data;
108 return ff_subtitles_queue_read_packet(&aqt->q, pkt);
109 }
110
aqt_read_seek(AVFormatContext * s,int stream_index,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)111 static int aqt_read_seek(AVFormatContext *s, int stream_index,
112 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
113 {
114 AQTitleContext *aqt = s->priv_data;
115 return ff_subtitles_queue_seek(&aqt->q, s, stream_index,
116 min_ts, ts, max_ts, flags);
117 }
118
aqt_read_close(AVFormatContext * s)119 static int aqt_read_close(AVFormatContext *s)
120 {
121 AQTitleContext *aqt = s->priv_data;
122 ff_subtitles_queue_clean(&aqt->q);
123 return 0;
124 }
125
126 #define OFFSET(x) offsetof(AQTitleContext, x)
127 #define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
128 static const AVOption aqt_options[] = {
129 { "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD },
130 { NULL }
131 };
132
133 static const AVClass aqt_class = {
134 .class_name = "aqtdec",
135 .item_name = av_default_item_name,
136 .option = aqt_options,
137 .version = LIBAVUTIL_VERSION_INT,
138 };
139
140 AVInputFormat ff_aqtitle_demuxer = {
141 .name = "aqtitle",
142 .long_name = NULL_IF_CONFIG_SMALL("AQTitle subtitles"),
143 .priv_data_size = sizeof(AQTitleContext),
144 .read_probe = aqt_probe,
145 .read_header = aqt_read_header,
146 .read_packet = aqt_read_packet,
147 .read_seek2 = aqt_read_seek,
148 .read_close = aqt_read_close,
149 .extensions = "aqt",
150 .priv_class = &aqt_class,
151 };
152