2 * MicroDVD subtitle demuxer
3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
4 * Copyright (c) 2012 Clément Bœsch <ubitux@gmail.com>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "subtitles.h"
26 #include "libavutil/intreadwrite.h"
28 #define MAX_LINESIZE 2048
32 FFDemuxSubtitlesQueue q;
36 static int microdvd_probe(AVProbeData *p)
39 const uint8_t *ptr = p->buf;
42 if (AV_RB24(ptr) == 0xEFBBBF)
43 ptr += 3; /* skip UTF-8 BOM */
46 if (sscanf(ptr, "{%*d}{}%c", &c) != 1 &&
47 sscanf(ptr, "{%*d}{%*d}%c", &c) != 1 &&
48 sscanf(ptr, "{DEFAULT}{}%c", &c) != 1)
50 ptr += strcspn(ptr, "\n") + 1;
52 return AVPROBE_SCORE_MAX;
55 static int64_t get_pts(const char *buf)
60 if (sscanf(buf, "{%d}{%c", &frame, &c) == 2)
62 return AV_NOPTS_VALUE;
65 static int get_duration(const char *buf)
67 int frame_start, frame_end;
69 if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2)
70 return frame_end - frame_start;
74 static int microdvd_read_header(AVFormatContext *s)
76 AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */
77 MicroDVDContext *microdvd = s->priv_data;
78 AVStream *st = avformat_new_stream(s, NULL);
80 char line[MAX_LINESIZE];
83 return AVERROR(ENOMEM);
85 while (!url_feof(s->pb)) {
87 int64_t pos = avio_tell(s->pb);
88 int len = ff_get_line(s->pb, line, sizeof(line));
98 if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 ||
99 sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2)
100 && frame <= 1 && fps > 3 && fps < 100)
101 pts_info = av_d2q(fps, 100000);
102 if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
103 st->codec->extradata = av_strdup(line + 11);
104 if (!st->codec->extradata)
105 return AVERROR(ENOMEM);
106 st->codec->extradata_size = strlen(st->codec->extradata) + 1;
110 sub = ff_subtitles_queue_insert(µdvd->q, line, len, 0);
112 return AVERROR(ENOMEM);
114 sub->pts = get_pts(sub->data);
115 sub->duration = get_duration(sub->data);
117 ff_subtitles_queue_finalize(µdvd->q);
118 avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
119 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
120 st->codec->codec_id = AV_CODEC_ID_MICRODVD;
124 static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)
126 MicroDVDContext *microdvd = s->priv_data;
127 return ff_subtitles_queue_read_packet(µdvd->q, pkt);
130 static int microdvd_read_seek(AVFormatContext *s, int stream_index,
131 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
133 MicroDVDContext *microdvd = s->priv_data;
134 return ff_subtitles_queue_seek(µdvd->q, s, stream_index,
135 min_ts, ts, max_ts, flags);
138 static int microdvd_read_close(AVFormatContext *s)
140 MicroDVDContext *microdvd = s->priv_data;
141 ff_subtitles_queue_clean(µdvd->q);
145 AVInputFormat ff_microdvd_demuxer = {
147 .long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
148 .priv_data_size = sizeof(MicroDVDContext),
149 .read_probe = microdvd_probe,
150 .read_header = microdvd_read_header,
151 .read_packet = microdvd_read_packet,
152 .read_seek2 = microdvd_read_seek,
153 .read_close = microdvd_read_close,
154 .flags = AVFMT_GENERIC_INDEX,