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
24 #include "subtitles.h"
25 #include "libavcodec/internal.h"
26 #include "libavutil/bprint.h"
28 typedef struct ASSContext{
29 FFDemuxSubtitlesQueue q;
32 static int ass_probe(AVProbeData *p)
34 const char *header= "[Script Info]";
36 if( !memcmp(p->buf , header, strlen(header))
37 || !memcmp(p->buf+3, header, strlen(header)))
38 return AVPROBE_SCORE_MAX;
43 static int ass_read_close(AVFormatContext *s)
45 ASSContext *ass = s->priv_data;
46 ff_subtitles_queue_clean(&ass->q);
50 static int read_ts(const uint8_t *p, int64_t *start, int *duration)
53 int hh1, mm1, ss1, ms1;
54 int hh2, mm2, ss2, ms2;
56 if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
57 &hh1, &mm1, &ss1, &ms1,
58 &hh2, &mm2, &ss2, &ms2) == 8) {
59 end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
60 *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
61 *duration = end - *start;
67 static int64_t get_line(AVBPrint *buf, AVIOContext *pb)
69 int64_t pos = avio_tell(pb);
76 av_bprint_chars(buf, c, 1);
83 static int ass_read_header(AVFormatContext *s)
85 ASSContext *ass = s->priv_data;
86 AVBPrint header, line;
87 int header_remaining, res = 0;
90 st = avformat_new_stream(s, NULL);
92 return AVERROR(ENOMEM);
93 avpriv_set_pts_info(st, 64, 1, 100);
94 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
95 st->codec->codec_id= AV_CODEC_ID_SSA;
97 header_remaining= INT_MAX;
99 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
100 av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
103 int64_t pos = get_line(&line, s->pb);
105 if (!line.str[0]) // EOF
108 if (!memcmp(line.str, "[Events]", 8))
110 else if (line.str[0]=='[')
111 header_remaining= INT_MAX;
113 if (header_remaining) {
114 av_bprintf(&header, "%s", line.str);
117 int64_t ts_start = AV_NOPTS_VALUE;
121 if (read_ts(line.str, &ts_start, &duration) < 0)
123 sub = ff_subtitles_queue_insert(&ass->q, line.str, line.len, 0);
125 res = AVERROR(ENOMEM);
130 sub->duration = duration;
134 av_bprint_finalize(&line, NULL);
136 res = avpriv_bprint_to_extradata(st->codec, &header);
140 ff_subtitles_queue_finalize(&ass->q);
146 static int ass_read_packet(AVFormatContext *s, AVPacket *pkt)
148 ASSContext *ass = s->priv_data;
149 return ff_subtitles_queue_read_packet(&ass->q, pkt);
152 static int ass_read_seek(AVFormatContext *s, int stream_index,
153 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
155 ASSContext *ass = s->priv_data;
156 return ff_subtitles_queue_seek(&ass->q, s, stream_index,
157 min_ts, ts, max_ts, flags);
160 AVInputFormat ff_ass_demuxer = {
162 .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
163 .priv_data_size = sizeof(ASSContext),
164 .read_probe = ass_probe,
165 .read_header = ass_read_header,
166 .read_packet = ass_read_packet,
167 .read_close = ass_read_close,
168 .read_seek2 = ass_read_seek,