avdevice/decklink_enc: add support for setting duplex mode
[ffmpeg.git] / libavformat / subviewer1dec.c
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
30 typedef struct {
31     FFDemuxSubtitlesQueue q;
32 } SubViewer1Context;
33
34 static int subviewer1_probe(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
43 static 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
93 static int subviewer1_read_packet(AVFormatContext *s, AVPacket *pkt)
94 {
95     SubViewer1Context *subviewer1 = s->priv_data;
96     return ff_subtitles_queue_read_packet(&subviewer1->q, pkt);
97 }
98
99 static int subviewer1_read_seek(AVFormatContext *s, int stream_index,
100                                int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
101 {
102     SubViewer1Context *subviewer1 = s->priv_data;
103     return ff_subtitles_queue_seek(&subviewer1->q, s, stream_index,
104                                    min_ts, ts, max_ts, flags);
105 }
106
107 static int subviewer1_read_close(AVFormatContext *s)
108 {
109     SubViewer1Context *subviewer1 = s->priv_data;
110     ff_subtitles_queue_clean(&subviewer1->q);
111     return 0;
112 }
113
114 AVInputFormat ff_subviewer1_demuxer = {
115     .name           = "subviewer1",
116     .long_name      = NULL_IF_CONFIG_SMALL("SubViewer v1 subtitle format"),
117     .priv_data_size = sizeof(SubViewer1Context),
118     .read_probe     = subviewer1_probe,
119     .read_header    = subviewer1_read_header,
120     .read_packet    = subviewer1_read_packet,
121     .read_seek2     = subviewer1_read_seek,
122     .read_close     = subviewer1_read_close,
123     .extensions     = "sub",
124 };