2 * Copyright (c) 2012 Clément Bœsch
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * SubViewer subtitle demuxer
24 * @see https://en.wikipedia.org/wiki/SubViewer
29 #include "subtitles.h"
30 #include "libavcodec/internal.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/bprint.h"
33 #include "libavutil/intreadwrite.h"
36 FFDemuxSubtitlesQueue q;
39 static int subviewer_probe(AVProbeData *p)
42 const unsigned char *ptr = p->buf;
44 if (AV_RB24(ptr) == 0xEFBBBF)
45 ptr += 3; /* skip UTF-8 BOM */
46 if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1)
47 return AVPROBE_SCORE_MAX/2;
48 if (!strncmp(ptr, "[INFORMATION]", 13))
49 return AVPROBE_SCORE_MAX/3;
53 static int read_ts(const char *s, int64_t *start, int *duration)
56 int hh1, mm1, ss1, ms1;
57 int hh2, mm2, ss2, ms2;
59 if (sscanf(s, "%u:%u:%u.%u,%u:%u:%u.%u",
60 &hh1, &mm1, &ss1, &ms1, &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 int subviewer_read_header(AVFormatContext *s)
71 SubViewerContext *subviewer = s->priv_data;
72 AVStream *st = avformat_new_stream(s, NULL);
77 return AVERROR(ENOMEM);
78 avpriv_set_pts_info(st, 64, 1, 100);
79 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
80 st->codec->codec_id = AV_CODEC_ID_SUBVIEWER;
82 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
84 while (!url_feof(s->pb)) {
86 const int64_t pos = avio_tell(s->pb);
87 int len = ff_get_line(s->pb, line, sizeof(line));
92 if (line[0] == '[' && strncmp(line, "[br]", 4)) {
94 /* ignore event style, XXX: add to side_data? */
95 if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") ||
96 strstr(line, "[FONT]") || strstr(line, "[STYLE]"))
99 if (!st->codec->extradata) { // header not finalized yet
100 av_bprintf(&header, "%s", line);
101 if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) {
103 res = avpriv_bprint_to_extradata(st->codec, &header);
106 } else if (strncmp(line, "[INFORMATION]", 13)) {
107 /* assume file metadata at this point */
109 char key[32], value[128];
111 for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++)
112 key[i - 1] = av_tolower(line[i]);
117 while (line[i] == ' ')
119 while (j < sizeof(value) - 1 && line[i] && !strchr("]\r\n", line[i]))
120 value[j++] = line[i++];
123 av_dict_set(&s->metadata, key, value, 0);
127 int64_t pts_start = AV_NOPTS_VALUE;
129 int timed_line = !read_ts(line, &pts_start, &duration);
132 sub = ff_subtitles_queue_insert(&subviewer->q, line, len, !timed_line);
134 res = AVERROR(ENOMEM);
139 sub->pts = pts_start;
140 sub->duration = duration;
145 ff_subtitles_queue_finalize(&subviewer->q);
148 av_bprint_finalize(&header, NULL);
152 static int subviewer_read_packet(AVFormatContext *s, AVPacket *pkt)
154 SubViewerContext *subviewer = s->priv_data;
155 return ff_subtitles_queue_read_packet(&subviewer->q, pkt);
158 static int subviewer_read_seek(AVFormatContext *s, int stream_index,
159 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
161 SubViewerContext *subviewer = s->priv_data;
162 return ff_subtitles_queue_seek(&subviewer->q, s, stream_index,
163 min_ts, ts, max_ts, flags);
166 static int subviewer_read_close(AVFormatContext *s)
168 SubViewerContext *subviewer = s->priv_data;
169 ff_subtitles_queue_clean(&subviewer->q);
173 AVInputFormat ff_subviewer_demuxer = {
175 .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"),
176 .priv_data_size = sizeof(SubViewerContext),
177 .read_probe = subviewer_probe,
178 .read_header = subviewer_read_header,
179 .read_packet = subviewer_read_packet,
180 .read_seek2 = subviewer_read_seek,
181 .read_close = subviewer_read_close,
182 .flags = AVFMT_GENERIC_INDEX,