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 "libavutil/avstring.h"
31 #include "libavutil/bprint.h"
32 #include "libavutil/intreadwrite.h"
35 FFDemuxSubtitlesQueue q;
38 static int subviewer_probe(AVProbeData *p)
41 const unsigned char *ptr = p->buf;
43 if (AV_RB24(ptr) == 0xEFBBBF)
44 ptr += 3; /* skip UTF-8 BOM */
45 if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1)
46 return AVPROBE_SCORE_MAX/2;
47 if (!strncmp(ptr, "[INFORMATION]", 13))
48 return AVPROBE_SCORE_MAX/3;
52 static int read_ts(const char *s, int64_t *start, int *duration)
55 int hh1, mm1, ss1, ms1;
56 int hh2, mm2, ss2, ms2;
58 if (sscanf(s, "%u:%u:%u.%u,%u:%u:%u.%u",
59 &hh1, &mm1, &ss1, &ms1, &hh2, &mm2, &ss2, &ms2) == 8) {
60 end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
61 *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
62 *duration = end - *start;
68 static int subviewer_read_header(AVFormatContext *s)
70 SubViewerContext *subviewer = s->priv_data;
71 AVStream *st = avformat_new_stream(s, NULL);
76 return AVERROR(ENOMEM);
77 avpriv_set_pts_info(st, 64, 1, 100);
78 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
79 st->codec->codec_id = AV_CODEC_ID_SUBVIEWER;
81 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
83 while (!url_feof(s->pb)) {
85 const int64_t pos = avio_tell(s->pb);
86 int len = ff_get_line(s->pb, line, sizeof(line));
91 if (line[0] == '[' && strncmp(line, "[br]", 4)) {
93 /* ignore event style, XXX: add to side_data? */
94 if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") ||
95 strstr(line, "[FONT]") || strstr(line, "[STYLE]"))
98 if (!st->codec->extradata) { // header not finalized yet
99 av_bprintf(&header, "%s", line);
100 if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) {
102 av_bprint_finalize(&header, (char **)&st->codec->extradata);
103 if (!st->codec->extradata) {
104 res = AVERROR(ENOMEM);
107 st->codec->extradata_size = header.len + 1;
108 } else if (strncmp(line, "[INFORMATION]", 13)) {
109 /* assume file metadata at this point */
111 char key[32], value[128];
113 for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++)
114 key[i - 1] = av_tolower(line[i]);
119 while (line[i] == ' ')
121 while (j < sizeof(value) - 1 && line[i] && !strchr("]\r\n", line[i]))
122 value[j++] = line[i++];
125 av_dict_set(&s->metadata, key, value, 0);
129 int64_t pts_start = AV_NOPTS_VALUE;
131 int timed_line = !read_ts(line, &pts_start, &duration);
134 sub = ff_subtitles_queue_insert(&subviewer->q, line, len, !timed_line);
136 res = AVERROR(ENOMEM);
141 sub->pts = pts_start;
142 sub->duration = duration;
147 ff_subtitles_queue_finalize(&subviewer->q);
150 av_bprint_finalize(&header, NULL);
154 static int subviewer_read_packet(AVFormatContext *s, AVPacket *pkt)
156 SubViewerContext *subviewer = s->priv_data;
157 return ff_subtitles_queue_read_packet(&subviewer->q, pkt);
160 static int subviewer_read_close(AVFormatContext *s)
162 SubViewerContext *subviewer = s->priv_data;
163 ff_subtitles_queue_clean(&subviewer->q);
167 AVInputFormat ff_subviewer_demuxer = {
169 .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"),
170 .priv_data_size = sizeof(SubViewerContext),
171 .read_probe = subviewer_probe,
172 .read_header = subviewer_read_header,
173 .read_packet = subviewer_read_packet,
174 .read_close = subviewer_read_close,
175 .flags = AVFMT_GENERIC_INDEX,