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(const AVProbeData * p)34 static 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
read_ts(char ** line)45 static 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
vplayer_read_header(AVFormatContext * s)58 static 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 ff_subtitles_queue_clean(&vplayer->q);
88 return AVERROR(ENOMEM);
89 }
90 sub->pos = pos;
91 sub->pts = pts_start;
92 sub->duration = -1;
93 }
94 }
95
96 ff_subtitles_queue_finalize(s, &vplayer->q);
97 return 0;
98 }
99
vplayer_read_packet(AVFormatContext * s,AVPacket * pkt)100 static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
101 {
102 VPlayerContext *vplayer = s->priv_data;
103 return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
104 }
105
vplayer_read_seek(AVFormatContext * s,int stream_index,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)106 static int vplayer_read_seek(AVFormatContext *s, int stream_index,
107 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
108 {
109 VPlayerContext *vplayer = s->priv_data;
110 return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
111 min_ts, ts, max_ts, flags);
112 }
113
vplayer_read_close(AVFormatContext * s)114 static int vplayer_read_close(AVFormatContext *s)
115 {
116 VPlayerContext *vplayer = s->priv_data;
117 ff_subtitles_queue_clean(&vplayer->q);
118 return 0;
119 }
120
121 AVInputFormat ff_vplayer_demuxer = {
122 .name = "vplayer",
123 .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
124 .priv_data_size = sizeof(VPlayerContext),
125 .read_probe = vplayer_probe,
126 .read_header = vplayer_read_header,
127 .read_packet = vplayer_read_packet,
128 .read_seek2 = vplayer_read_seek,
129 .read_close = vplayer_read_close,
130 .extensions = "txt",
131 };
132