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
30 typedef struct {
31 FFDemuxSubtitlesQueue q;
32 } VPlayerContext;
33
vplayer_probe(AVProbeData * p)34 static int vplayer_probe(AVProbeData *p)
35 {
36 char c;
37 const unsigned char *ptr = p->buf;
38
39 if (sscanf(ptr, "%*d:%*d:%*d.%*d%c", &c) == 1 && strchr(": =", c))
40 return AVPROBE_SCORE_MAX;
41 return 0;
42 }
43
read_ts(char ** line)44 static int64_t read_ts(char **line)
45 {
46 char c;
47 int hh, mm, ss, ms, len;
48
49 if (sscanf(*line, "%d:%d:%d.%d%c%n",
50 &hh, &mm, &ss, &ms, &c, &len) >= 5) {
51 *line += len;
52 return (hh*LLN(3600) + mm*LLN(60) + ss) * LLN(100) + ms;
53 }
54 return AV_NOPTS_VALUE;
55 }
56
vplayer_read_header(AVFormatContext * s)57 static int vplayer_read_header(AVFormatContext *s)
58 {
59 VPlayerContext *vplayer = s->priv_data;
60 AVStream *st = avformat_new_stream(s, NULL);
61
62 if (!st)
63 return AVERROR(ENOMEM);
64 avpriv_set_pts_info(st, 64, 1, 100);
65 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
66 st->codec->codec_id = AV_CODEC_ID_VPLAYER;
67
68 while (!avio_feof(s->pb)) {
69 char line[4096];
70 char *p = line;
71 const int64_t pos = avio_tell(s->pb);
72 int len = ff_get_line(s->pb, line, sizeof(line));
73 int64_t pts_start;
74
75 if (!len)
76 break;
77
78 line[strcspn(line, "\r\n")] = 0;
79
80 pts_start = read_ts(&p);
81 if (pts_start != AV_NOPTS_VALUE) {
82 AVPacket *sub;
83
84 sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
85 if (!sub)
86 return AVERROR(ENOMEM);
87 sub->pos = pos;
88 sub->pts = pts_start;
89 sub->duration = -1;
90 }
91 }
92
93 ff_subtitles_queue_finalize(&vplayer->q);
94 return 0;
95 }
96
vplayer_read_packet(AVFormatContext * s,AVPacket * pkt)97 static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
98 {
99 VPlayerContext *vplayer = s->priv_data;
100 return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
101 }
102
vplayer_read_seek(AVFormatContext * s,int stream_index,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)103 static int vplayer_read_seek(AVFormatContext *s, int stream_index,
104 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
105 {
106 VPlayerContext *vplayer = s->priv_data;
107 return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
108 min_ts, ts, max_ts, flags);
109 }
110
vplayer_read_close(AVFormatContext * s)111 static int vplayer_read_close(AVFormatContext *s)
112 {
113 VPlayerContext *vplayer = s->priv_data;
114 ff_subtitles_queue_clean(&vplayer->q);
115 return 0;
116 }
117
118 AVInputFormat ff_vplayer_demuxer = {
119 .name = "vplayer",
120 .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
121 .priv_data_size = sizeof(VPlayerContext),
122 .read_probe = vplayer_probe,
123 .read_header = vplayer_read_header,
124 .read_packet = vplayer_read_packet,
125 .read_seek2 = vplayer_read_seek,
126 .read_close = vplayer_read_close,
127 .extensions = "txt",
128 };
129