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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->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
54 | st->codec->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(&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 | }; |