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 "avio_internal.h"
31 #include "libavcodec/internal.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/bprint.h"
34 #include "libavutil/intreadwrite.h"
37 FFDemuxSubtitlesQueue q;
40 static int subviewer_probe(const AVProbeData *p)
43 const unsigned char *ptr = p->buf;
45 if (AV_RB24(ptr) == 0xEFBBBF)
46 ptr += 3; /* skip UTF-8 BOM */
47 if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1)
48 return AVPROBE_SCORE_EXTENSION;
49 if (!strncmp(ptr, "[INFORMATION]", 13))
50 return AVPROBE_SCORE_MAX/3;
54 static int read_ts(const char *s, int64_t *start, int *duration)
57 int hh1, mm1, ss1, ms1;
58 int hh2, mm2, ss2, ms2;
60 if (sscanf(s, "%u:%u:%u.%u,%u:%u:%u.%u",
61 &hh1, &mm1, &ss1, &ms1, &hh2, &mm2, &ss2, &ms2) == 8) {
62 end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
63 *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
64 *duration = end - *start;
70 static int subviewer_read_header(AVFormatContext *s)
72 SubViewerContext *subviewer = s->priv_data;
73 AVStream *st = avformat_new_stream(s, NULL);
75 int res = 0, new_event = 1;
76 int64_t pts_start = AV_NOPTS_VALUE;
81 return AVERROR(ENOMEM);
82 res = ffio_ensure_seekback(s->pb, 3);
85 if (avio_rb24(s->pb) != 0xefbbbf)
86 avio_seek(s->pb, -3, SEEK_CUR);
87 avpriv_set_pts_info(st, 64, 1, 100);
88 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
89 st->codecpar->codec_id = AV_CODEC_ID_SUBVIEWER;
91 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
93 while (!avio_feof(s->pb)) {
96 int len = ff_get_line(s->pb, line, sizeof(line));
101 line[strcspn(line, "\r\n")] = 0;
103 if (line[0] == '[' && strncmp(line, "[br]", 4)) {
105 /* ignore event style, XXX: add to side_data? */
106 if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") ||
107 strstr(line, "[FONT]") || strstr(line, "[STYLE]"))
110 if (!st->codecpar->extradata) { // header not finalized yet
111 av_bprintf(&header, "%s\n", line);
112 if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) {
114 res = ff_bprint_to_codecpar_extradata(st->codecpar, &header);
117 } else if (strncmp(line, "[INFORMATION]", 13)) {
118 /* assume file metadata at this point */
120 char key[32], value[128];
122 for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++)
123 key[i - 1] = av_tolower(line[i]);
128 while (line[i] == ' ')
130 while (j < sizeof(value) - 1 && line[i] && line[i] != ']')
131 value[j++] = line[i++];
134 av_dict_set(&s->metadata, key, value, 0);
137 } else if (read_ts(line, &pts_start, &duration) >= 0) {
139 pos = avio_tell(s->pb);
142 sub = ff_subtitles_queue_insert(&subviewer->q, "\n", 1, 1);
144 res = AVERROR(ENOMEM);
148 sub = ff_subtitles_queue_insert(&subviewer->q, line, strlen(line), !new_event);
150 res = AVERROR(ENOMEM);
155 sub->pts = pts_start;
156 sub->duration = duration;
162 ff_subtitles_queue_finalize(s, &subviewer->q);
165 av_bprint_finalize(&header, NULL);
169 static int subviewer_read_packet(AVFormatContext *s, AVPacket *pkt)
171 SubViewerContext *subviewer = s->priv_data;
172 return ff_subtitles_queue_read_packet(&subviewer->q, pkt);
175 static int subviewer_read_seek(AVFormatContext *s, int stream_index,
176 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
178 SubViewerContext *subviewer = s->priv_data;
179 return ff_subtitles_queue_seek(&subviewer->q, s, stream_index,
180 min_ts, ts, max_ts, flags);
183 static int subviewer_read_close(AVFormatContext *s)
185 SubViewerContext *subviewer = s->priv_data;
186 ff_subtitles_queue_clean(&subviewer->q);
190 AVInputFormat ff_subviewer_demuxer = {
192 .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"),
193 .priv_data_size = sizeof(SubViewerContext),
194 .read_probe = subviewer_probe,
195 .read_header = subviewer_read_header,
196 .read_packet = subviewer_read_packet,
197 .read_seek2 = subviewer_read_seek,
198 .read_close = subviewer_read_close,