2 * Copyright (c) 2012 Clément Bœsch
4 * This file is part of FFmpeg.
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.
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.
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
23 * RealText subtitle demuxer
24 * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
29 #include "subtitles.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/bprint.h"
32 #include "libavutil/intreadwrite.h"
35 FFDemuxSubtitlesQueue q;
38 static int realtext_probe(AVProbeData *p)
40 const unsigned char *ptr = p->buf;
42 if (AV_RB24(ptr) == 0xEFBBBF)
43 ptr += 3; /* skip UTF-8 BOM */
44 return !av_strncasecmp(ptr, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0;
47 static int read_ts(const char *s)
51 if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600 + mm*60 + ss) * 100 + ms;
52 if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600 + mm*60 + ss) * 100;
53 if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60 + ss) * 100 + ms;
54 if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60 + ss) * 100;
55 if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100 + ms;
56 return strtol(s, NULL, 10) * 100;
59 static int realtext_read_header(AVFormatContext *s)
61 RealTextContext *rt = s->priv_data;
62 AVStream *st = avformat_new_stream(s, NULL);
65 int res = 0, duration = read_ts("60"); // default duration is 60 seconds
68 return AVERROR(ENOMEM);
69 avpriv_set_pts_info(st, 64, 1, 100);
70 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
71 st->codec->codec_id = AV_CODEC_ID_REALTEXT;
73 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
75 while (!url_feof(s->pb)) {
77 const int64_t pos = avio_tell(s->pb) - (c != 0);
78 int n = ff_smil_extract_next_chunk(s->pb, &buf, &c);
83 if (!av_strncasecmp(buf.str, "<window", 7)) {
84 /* save header to extradata */
85 const char *p = ff_smil_get_attr_ptr(buf.str, "duration");
88 duration = read_ts(p);
89 st->codec->extradata = av_strdup(buf.str);
90 if (!st->codec->extradata) {
91 res = AVERROR(ENOMEM);
94 st->codec->extradata_size = buf.len + 1;
96 /* if we just read a <time> tag, introduce a new event, otherwise merge
97 * with the previous one */
98 int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1;
99 sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge);
101 res = AVERROR(ENOMEM);
105 const char *begin = ff_smil_get_attr_ptr(buf.str, "begin");
106 const char *end = ff_smil_get_attr_ptr(buf.str, "end");
109 sub->pts = begin ? read_ts(begin) : 0;
110 sub->duration = end ? (read_ts(end) - sub->pts) : duration;
113 av_bprint_clear(&buf);
115 ff_subtitles_queue_finalize(&rt->q);
118 av_bprint_finalize(&buf, NULL);
122 static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt)
124 RealTextContext *rt = s->priv_data;
125 return ff_subtitles_queue_read_packet(&rt->q, pkt);
128 static int realtext_read_seek(AVFormatContext *s, int stream_index,
129 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
131 RealTextContext *rt = s->priv_data;
132 return ff_subtitles_queue_seek(&rt->q, s, stream_index,
133 min_ts, ts, max_ts, flags);
136 static int realtext_read_close(AVFormatContext *s)
138 RealTextContext *rt = s->priv_data;
139 ff_subtitles_queue_clean(&rt->q);
143 AVInputFormat ff_realtext_demuxer = {
145 .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"),
146 .priv_data_size = sizeof(RealTextContext),
147 .read_probe = realtext_probe,
148 .read_header = realtext_read_header,
149 .read_packet = realtext_read_packet,
150 .read_seek2 = realtext_read_seek,
151 .read_close = realtext_read_close,