blob: e579d1ca9aee88495df205fabc4cd969a676b07a
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 | }; |
125 |