path: root/libavformat/vplayerdec.c (plain)
blob: 49943d0d0e6b0b4e9ab2d766608ad4c396166f9a

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
34	static int vplayer_probe(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
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
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	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
98	static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
99	{
100	VPlayerContext *vplayer = s->priv_data;
101	return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
102	}
103
104	static int vplayer_read_seek(AVFormatContext *s, int stream_index,
105	int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
106	{
107	VPlayerContext *vplayer = s->priv_data;
108	return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
109	min_ts, ts, max_ts, flags);
110	}
111
112	static int vplayer_read_close(AVFormatContext *s)
113	{
114	VPlayerContext *vplayer = s->priv_data;
115	ff_subtitles_queue_clean(&vplayer->q);
116	return 0;
117	}
118
119	AVInputFormat ff_vplayer_demuxer = {
120	.name = "vplayer",
121	.long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
122	.priv_data_size = sizeof(VPlayerContext),
123	.read_probe = vplayer_probe,
124	.read_header = vplayer_read_header,
125	.read_packet = vplayer_read_packet,
126	.read_seek2 = vplayer_read_seek,
127	.read_close = vplayer_read_close,
128	.extensions = "txt",
129	};
130