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 "libavutil/intreadwrite.h"
26 static int srt_probe(AVProbeData *p)
28 unsigned char *ptr = p->buf;
31 if (AV_RB24(ptr) == 0xEFBBBF)
32 ptr += 3; /* skip UTF-8 BOM */
35 if (num == i && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1)
36 return AVPROBE_SCORE_MAX;
38 ptr += strcspn(ptr, "\n") + 1;
43 static int srt_read_header(AVFormatContext *s)
45 AVStream *st = avformat_new_stream(s, NULL);
47 return AVERROR(ENOMEM);
48 avpriv_set_pts_info(st, 64, 1, 1000);
49 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
50 st->codec->codec_id = AV_CODEC_ID_SUBRIP;
54 static int64_t get_pts(char **buf, int *duration,
55 int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2)
60 int hh1, mm1, ss1, ms1;
61 int hh2, mm2, ss2, ms2;
62 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
63 "%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
64 &hh1, &mm1, &ss1, &ms1,
65 &hh2, &mm2, &ss2, &ms2,
66 x1, x2, y1, y2) >= 8) {
67 int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1;
68 int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2;
69 *duration = end - start;
70 *buf += strcspn(*buf, "\n") + 1;
73 *buf += strcspn(*buf, "\n") + 1;
75 return AV_NOPTS_VALUE;
78 static inline int is_eol(char c)
80 return c == '\r' || c == '\n';
83 static int srt_read_packet(AVFormatContext *s, AVPacket *pkt)
85 char buffer[2048], *ptr = buffer, *ptr2;
86 int64_t pos = avio_tell(s->pb);
87 int res = AVERROR_EOF;
91 ptr += ff_get_line(s->pb, ptr, sizeof(buffer)+buffer-ptr);
92 } while (!is_eol(*ptr2) && !url_feof(s->pb) && ptr-buffer<sizeof(buffer)-1);
97 const char *end = ptr;
98 int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1;
101 pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2);
102 if (pts != AV_NOPTS_VALUE &&
103 !(res = av_new_packet(pkt, end - ptr))) {
104 memcpy(pkt->data, ptr, pkt->size);
105 pkt->flags |= AV_PKT_FLAG_KEY;
107 pkt->pts = pkt->dts = pts;
108 pkt->duration = duration;
110 uint8_t *p = av_packet_new_side_data(pkt, AV_PKT_DATA_SUBTITLE_POSITION, 16);
123 AVInputFormat ff_srt_demuxer = {
125 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
126 .read_probe = srt_probe,
127 .read_header = srt_read_header,
128 .read_packet = srt_read_packet,
129 .flags = AVFMT_GENERIC_INDEX,