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 * VPlayer subtitles format demuxer
24 */
25
26#include "avformat.h"
27#include "internal.h"
28#include "subtitles.h"
29
30typedef struct {
31    FFDemuxSubtitlesQueue q;
32} VPlayerContext;
33
34static int vplayer_probe(const AVProbeData *p)
35{
36    char c;
37    const unsigned char *ptr = p->buf;
38
39    if ((sscanf(ptr, "%*3d:%*2d:%*2d.%*2d%c", &c) == 1 ||
40         sscanf(ptr, "%*3d:%*2d:%*2d%c",      &c) == 1) && strchr(": =", c))
41        return AVPROBE_SCORE_MAX;
42    return 0;
43}
44
45static int64_t read_ts(char **line)
46{
47    char c;
48    int hh, mm, ss, ms, n, len;
49
50    if (((n = sscanf(*line, "%d:%d:%d.%d%c%n", &hh, &mm, &ss, &ms, &c, &len)) >= 5 ||
51         (n = sscanf(*line, "%d:%d:%d%c%n",    &hh, &mm, &ss,      &c, &len)) >= 4) && strchr(": =", c)) {
52        *line += len;
53        return (hh*3600LL + mm*60LL + ss) * 100LL + (n < 5 ? 0 : ms);
54    }
55    return AV_NOPTS_VALUE;
56}
57
58static int vplayer_read_header(AVFormatContext *s)
59{
60    VPlayerContext *vplayer = s->priv_data;
61    AVStream *st = avformat_new_stream(s, NULL);
62
63    if (!st)
64        return AVERROR(ENOMEM);
65    avpriv_set_pts_info(st, 64, 1, 100);
66    st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
67    st->codecpar->codec_id   = AV_CODEC_ID_VPLAYER;
68
69    while (!avio_feof(s->pb)) {
70        char line[4096];
71        char *p = line;
72        const int64_t pos = avio_tell(s->pb);
73        int len = ff_get_line(s->pb, line, sizeof(line));
74        int64_t pts_start;
75
76        if (!len)
77            break;
78
79        line[strcspn(line, "\r\n")] = 0;
80
81        pts_start = read_ts(&p);
82        if (pts_start != AV_NOPTS_VALUE) {
83            AVPacket *sub;
84
85            sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
86            if (!sub)
87                return AVERROR(ENOMEM);
88            sub->pos = pos;
89            sub->pts = pts_start;
90            sub->duration = -1;
91        }
92    }
93
94    ff_subtitles_queue_finalize(s, &vplayer->q);
95    return 0;
96}
97
98const AVInputFormat ff_vplayer_demuxer = {
99    .name           = "vplayer",
100    .long_name      = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
101    .priv_data_size = sizeof(VPlayerContext),
102    .flags_internal = FF_FMT_INIT_CLEANUP,
103    .read_probe     = vplayer_probe,
104    .read_header    = vplayer_read_header,
105    .extensions     = "txt",
106    .read_packet    = ff_subtitles_read_packet,
107    .read_seek2     = ff_subtitles_read_seek,
108    .read_close     = ff_subtitles_read_close,
109};
110