3 * Copyright (c) 2008 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "subtitles.h"
27 #include "libavcodec/internal.h"
28 #include "libavutil/bprint.h"
30 typedef struct ASSContext {
31 FFDemuxSubtitlesQueue q;
34 static int ass_probe(AVProbeData *p)
36 const char *header = "[Script Info]";
38 if (!memcmp(p->buf, header, strlen(header)) ||
39 !memcmp(p->buf + 3, header, strlen(header)))
40 return AVPROBE_SCORE_MAX;
45 static int ass_read_close(AVFormatContext *s)
47 ASSContext *ass = s->priv_data;
48 ff_subtitles_queue_clean(&ass->q);
52 static int read_ts(const uint8_t *p, int64_t *start, int *duration)
55 int hh1, mm1, ss1, ms1;
56 int hh2, mm2, ss2, ms2;
58 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
59 &hh1, &mm1, &ss1, &ms1,
60 &hh2, &mm2, &ss2, &ms2) == 8) {
61 end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
62 *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
63 *duration = end - *start;
69 static int64_t get_line(AVBPrint *buf, AVIOContext *pb)
71 int64_t pos = avio_tell(pb);
78 av_bprint_chars(buf, c, 1);
85 static int ass_read_header(AVFormatContext *s)
87 ASSContext *ass = s->priv_data;
88 AVBPrint header, line;
89 int header_remaining, res = 0;
92 st = avformat_new_stream(s, NULL);
94 return AVERROR(ENOMEM);
95 avpriv_set_pts_info(st, 64, 1, 100);
96 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
97 st->codec->codec_id = AV_CODEC_ID_SSA;
99 header_remaining = INT_MAX;
101 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
102 av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
105 int64_t pos = get_line(&line, s->pb);
107 if (!line.str[0]) // EOF
110 if (!memcmp(line.str, "[Events]", 8))
111 header_remaining = 2;
112 else if (line.str[0] == '[')
113 header_remaining = INT_MAX;
115 if (header_remaining) {
116 av_bprintf(&header, "%s", line.str);
119 int64_t ts_start = AV_NOPTS_VALUE;
123 if (read_ts(line.str, &ts_start, &duration) < 0)
125 sub = ff_subtitles_queue_insert(&ass->q, line.str, line.len, 0);
127 res = AVERROR(ENOMEM);
132 sub->duration = duration;
136 av_bprint_finalize(&line, NULL);
138 res = avpriv_bprint_to_extradata(st->codec, &header);
142 ff_subtitles_queue_finalize(&ass->q);
148 static int ass_read_packet(AVFormatContext *s, AVPacket *pkt)
150 ASSContext *ass = s->priv_data;
151 return ff_subtitles_queue_read_packet(&ass->q, pkt);
154 static int ass_read_seek(AVFormatContext *s, int stream_index,
155 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
157 ASSContext *ass = s->priv_data;
158 return ff_subtitles_queue_seek(&ass->q, s, stream_index,
159 min_ts, ts, max_ts, flags);
162 AVInputFormat ff_ass_demuxer = {
164 .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
165 .priv_data_size = sizeof(ASSContext),
166 .read_probe = ass_probe,
167 .read_header = ass_read_header,
168 .read_packet = ass_read_packet,
169 .read_close = ass_read_close,
170 .read_seek2 = ass_read_seek,