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)
34 unsigned char *ptr = p->buf;
37 if (AV_RB24(ptr) == 0xEFBBBF)
38 ptr += 3; /* skip UTF-8 BOM */
41 if ((num == i || num + 1 == i)
42 && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1)
43 return AVPROBE_SCORE_MAX;
45 ptr += strcspn(ptr, "\n") + 1;
50 static int64_t get_pts(const char **buf, int *duration,
51 int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2)
56 int hh1, mm1, ss1, ms1;
57 int hh2, mm2, ss2, ms2;
58 if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
59 "%*[ ]X1:%u X2:%u Y1:%u Y2:%u",
60 &hh1, &mm1, &ss1, &ms1,
61 &hh2, &mm2, &ss2, &ms2,
62 x1, x2, y1, y2) >= 8) {
63 int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1;
64 int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2;
65 *duration = end - start;
66 *buf += strcspn(*buf, "\n") + 1;
69 *buf += strcspn(*buf, "\n") + 1;
71 return AV_NOPTS_VALUE;
74 static inline int is_eol(char c)
76 return c == '\r' || c == '\n';
79 static void read_chunk(AVIOContext *pb, AVBPrint *buf)
82 int n = 0, i = 0, nb_eol = 0;
92 /* ignore all initial line breaks */
93 if (n == 0 && is_eol(c))
96 /* line break buffering: we don't want to add the trailing \r\n */
102 if (i == sizeof(eol_buf) - 1)
107 /* only one line break followed by data: we flush the line breaks
111 av_bprintf(buf, "%s", eol_buf);
115 av_bprint_chars(buf, c, 1);
119 /* FIXME: remove the following when the lavc SubRip decoder is fixed
120 * (trailing tags are not correctly flushed, see what happens to FATE when
121 * you disable this code) */
123 av_bprintf(buf, "\n");
126 static int srt_read_header(AVFormatContext *s)
128 SRTContext *srt = s->priv_data;
130 AVStream *st = avformat_new_stream(s, NULL);
134 return AVERROR(ENOMEM);
135 avpriv_set_pts_info(st, 64, 1, 1000);
136 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
137 st->codec->codec_id = AV_CODEC_ID_SUBRIP;
139 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
141 while (!url_feof(s->pb)) {
142 read_chunk(s->pb, &buf);
145 int64_t pos = avio_tell(s->pb);
148 const char *ptr = buf.str;
149 int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1;
152 pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2);
153 if (pts != AV_NOPTS_VALUE) {
154 int len = buf.len - (ptr - buf.str);
155 sub = ff_subtitles_queue_insert(&srt->q, ptr, len, 0);
157 res = AVERROR(ENOMEM);
162 sub->duration = duration;
164 uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16);
176 ff_subtitles_queue_finalize(&srt->q);
179 av_bprint_finalize(&buf, NULL);
183 static int srt_read_packet(AVFormatContext *s, AVPacket *pkt)
185 SRTContext *srt = s->priv_data;
186 return ff_subtitles_queue_read_packet(&srt->q, pkt);
189 static int srt_read_seek(AVFormatContext *s, int stream_index,
190 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
192 SRTContext *srt = s->priv_data;
193 return ff_subtitles_queue_seek(&srt->q, s, stream_index,
194 min_ts, ts, max_ts, flags);
197 static int srt_read_close(AVFormatContext *s)
199 SRTContext *srt = s->priv_data;
200 ff_subtitles_queue_clean(&srt->q);
204 AVInputFormat ff_srt_demuxer = {
206 .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
207 .priv_data_size = sizeof(SRTContext),
208 .read_probe = srt_probe,
209 .read_header = srt_read_header,
210 .read_packet = srt_read_packet,
211 .read_seek2 = srt_read_seek,
212 .read_close = srt_read_close,
213 .flags = AVFMT_GENERIC_INDEX,