2 * SubRip subtitle demuxer
3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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 "libavutil/bprint.h"
26 #include "libavutil/intreadwrite.h"
29 FFDemuxSubtitlesQueue q;
32 static int srt_probe(AVProbeData *p)
38 ff_text_init_buf(&tr, p->buf, p->buf_size);
40 while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n')
43 /* Check if the first non-empty line is a number. We do not check what the
44 * number is because in practice it can be anything. */
45 if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0 ||
46 strtol(buf, &pbuf, 10) < 0 || *pbuf)
49 /* Check if the next line matches a SRT timestamp */
50 if (ff_subtitles_read_line(&tr, buf, sizeof(buf)) < 0)
52 if (buf[0] >= '0' && buf[1] <= '9' && strstr(buf, " --> ")
53 && sscanf(buf, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1)
54 return AVPROBE_SCORE_MAX;
59 static int64_t get_pts(const char **buf, int *duration,
60 int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2)
65 int hh1, mm1, ss1, ms1;
66 int hh2, mm2, ss2, ms2;
67 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
68 "%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
69 &hh1, &mm1, &ss1, &ms1,
70 &hh2, &mm2, &ss2, &ms2,
71 x1, x2, y1, y2) >= 8) {
72 int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1;
73 int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2;
74 *duration = end - start;
75 *buf += ff_subtitles_next_line(*buf);
78 *buf += ff_subtitles_next_line(*buf);
80 return AV_NOPTS_VALUE;
83 static int srt_read_header(AVFormatContext *s)
85 SRTContext *srt = s->priv_data;
87 AVStream *st = avformat_new_stream(s, NULL);
90 ff_text_init_avio(s, &tr, s->pb);
93 return AVERROR(ENOMEM);
94 avpriv_set_pts_info(st, 64, 1, 1000);
95 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
96 st->codec->codec_id = AV_CODEC_ID_SUBRIP;
98 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
100 while (!ff_text_eof(&tr)) {
101 ff_subtitles_read_text_chunk(&tr, &buf);
104 int64_t pos = ff_text_pos(&tr);
107 const char *ptr = buf.str;
108 int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1;
111 pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2);
112 if (pts != AV_NOPTS_VALUE) {
113 int len = buf.len - (ptr - buf.str);
116 sub = ff_subtitles_queue_insert(&srt->q, ptr, len, 0);
118 res = AVERROR(ENOMEM);
123 sub->duration = duration;
125 uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16);
137 ff_subtitles_queue_finalize(s, &srt->q);
140 av_bprint_finalize(&buf, NULL);
144 static int srt_read_packet(AVFormatContext *s, AVPacket *pkt)
146 SRTContext *srt = s->priv_data;
147 return ff_subtitles_queue_read_packet(&srt->q, pkt);
150 static int srt_read_seek(AVFormatContext *s, int stream_index,
151 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
153 SRTContext *srt = s->priv_data;
154 return ff_subtitles_queue_seek(&srt->q, s, stream_index,
155 min_ts, ts, max_ts, flags);
158 static int srt_read_close(AVFormatContext *s)
160 SRTContext *srt = s->priv_data;
161 ff_subtitles_queue_clean(&srt->q);
165 AVInputFormat ff_srt_demuxer = {
167 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
168 .priv_data_size = sizeof(SRTContext),
169 .read_probe = srt_probe,
170 .read_header = srt_read_header,
171 .read_packet = srt_read_packet,
172 .read_seek2 = srt_read_seek,
173 .read_close = srt_read_close,