1/*
2 * Copyright (c) 2012 Clément Bœsch
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21/**
22 * @file
23 * SubViewer v1 subtitle demuxer
24 */
25
26#include "avformat.h"
27#include "internal.h"
28#include "subtitles.h"
29
30typedef struct {
31    FFDemuxSubtitlesQueue q;
32} SubViewer1Context;
33
34static int subviewer1_probe(const AVProbeData *p)
35{
36    const unsigned char *ptr = p->buf;
37
38    if (strstr(ptr, "******** START SCRIPT ********"))
39        return AVPROBE_SCORE_EXTENSION;
40    return 0;
41}
42
43static int subviewer1_read_header(AVFormatContext *s)
44{
45    int delay = 0;
46    AVPacket *sub = NULL;
47    SubViewer1Context *subviewer1 = s->priv_data;
48    AVStream *st = avformat_new_stream(s, NULL);
49
50    if (!st)
51        return AVERROR(ENOMEM);
52    avpriv_set_pts_info(st, 64, 1, 1);
53    st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
54    st->codecpar->codec_id   = AV_CODEC_ID_SUBVIEWER1;
55
56    while (!avio_feof(s->pb)) {
57        char line[4096];
58        int len = ff_get_line(s->pb, line, sizeof(line));
59        int hh, mm, ss;
60
61        if (!len)
62            break;
63
64        if (!strncmp(line, "[DELAY]", 7)) {
65            ff_get_line(s->pb, line, sizeof(line));
66            sscanf(line, "%d", &delay);
67        }
68
69        if (sscanf(line, "[%d:%d:%d]", &hh, &mm, &ss) == 3) {
70            const int64_t pos = avio_tell(s->pb);
71            int64_t pts_start = hh*3600LL + mm*60LL + ss + delay;
72
73            len = ff_get_line(s->pb, line, sizeof(line));
74            line[strcspn(line, "\r\n")] = 0;
75            if (!*line) {
76                if (sub)
77                    sub->duration = pts_start - sub->pts;
78            } else {
79                sub = ff_subtitles_queue_insert(&subviewer1->q, line, len, 0);
80                if (!sub)
81                    return AVERROR(ENOMEM);
82                sub->pos = pos;
83                sub->pts = pts_start;
84                sub->duration = -1;
85            }
86        }
87    }
88
89    ff_subtitles_queue_finalize(s, &subviewer1->q);
90    return 0;
91}
92
93const AVInputFormat ff_subviewer1_demuxer = {
94    .name           = "subviewer1",
95    .long_name      = NULL_IF_CONFIG_SMALL("SubViewer v1 subtitle format"),
96    .priv_data_size = sizeof(SubViewer1Context),
97    .flags_internal = FF_FMT_INIT_CLEANUP,
98    .read_probe     = subviewer1_probe,
99    .read_header    = subviewer1_read_header,
100    .extensions     = "sub",
101    .read_packet    = ff_subtitles_read_packet,
102    .read_seek2     = ff_subtitles_read_seek,
103    .read_close     = ff_subtitles_read_close,
104};
105