blob: 618d4f78ecfce5ff59c573fec663143fd0b0d72d
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 | * RealText subtitle demuxer |
24 | * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm |
25 | */ |
26 | |
27 | #include "avformat.h" |
28 | #include "internal.h" |
29 | #include "subtitles.h" |
30 | #include "libavutil/avstring.h" |
31 | #include "libavutil/bprint.h" |
32 | #include "libavutil/intreadwrite.h" |
33 | |
34 | typedef struct { |
35 | FFDemuxSubtitlesQueue q; |
36 | } RealTextContext; |
37 | |
38 | static int realtext_probe(AVProbeData *p) |
39 | { |
40 | char buf[7]; |
41 | FFTextReader tr; |
42 | ff_text_init_buf(&tr, p->buf, p->buf_size); |
43 | ff_text_read(&tr, buf, sizeof(buf)); |
44 | |
45 | return !av_strncasecmp(buf, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0; |
46 | } |
47 | |
48 | static int read_ts(const char *s) |
49 | { |
50 | int hh, mm, ss, ms; |
51 | |
52 | if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600 + mm*60 + ss) * 100 + ms; |
53 | if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600 + mm*60 + ss) * 100; |
54 | if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60 + ss) * 100 + ms; |
55 | if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60 + ss) * 100; |
56 | if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100 + ms; |
57 | return strtol(s, NULL, 10) * 100; |
58 | } |
59 | |
60 | static int realtext_read_header(AVFormatContext *s) |
61 | { |
62 | RealTextContext *rt = s->priv_data; |
63 | AVStream *st = avformat_new_stream(s, NULL); |
64 | AVBPrint buf; |
65 | char c = 0; |
66 | int res = 0, duration = read_ts("60"); // default duration is 60 seconds |
67 | FFTextReader tr; |
68 | ff_text_init_avio(s, &tr, s->pb); |
69 | |
70 | if (!st) |
71 | return AVERROR(ENOMEM); |
72 | avpriv_set_pts_info(st, 64, 1, 100); |
73 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
74 | st->codecpar->codec_id = AV_CODEC_ID_REALTEXT; |
75 | |
76 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
77 | |
78 | while (!ff_text_eof(&tr)) { |
79 | AVPacket *sub; |
80 | const int64_t pos = ff_text_pos(&tr) - (c != 0); |
81 | int n = ff_smil_extract_next_text_chunk(&tr, &buf, &c); |
82 | |
83 | if (n == 0) |
84 | break; |
85 | |
86 | if (!av_strncasecmp(buf.str, "<window", 7)) { |
87 | /* save header to extradata */ |
88 | const char *p = ff_smil_get_attr_ptr(buf.str, "duration"); |
89 | |
90 | if (p) |
91 | duration = read_ts(p); |
92 | st->codecpar->extradata = av_strdup(buf.str); |
93 | if (!st->codecpar->extradata) { |
94 | res = AVERROR(ENOMEM); |
95 | goto end; |
96 | } |
97 | st->codecpar->extradata_size = buf.len + 1; |
98 | } else { |
99 | /* if we just read a <time> tag, introduce a new event, otherwise merge |
100 | * with the previous one */ |
101 | int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1; |
102 | sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge); |
103 | if (!sub) { |
104 | res = AVERROR(ENOMEM); |
105 | goto end; |
106 | } |
107 | if (!merge) { |
108 | const char *begin = ff_smil_get_attr_ptr(buf.str, "begin"); |
109 | const char *end = ff_smil_get_attr_ptr(buf.str, "end"); |
110 | |
111 | sub->pos = pos; |
112 | sub->pts = begin ? read_ts(begin) : 0; |
113 | sub->duration = end ? (read_ts(end) - sub->pts) : duration; |
114 | } |
115 | } |
116 | av_bprint_clear(&buf); |
117 | } |
118 | ff_subtitles_queue_finalize(s, &rt->q); |
119 | |
120 | end: |
121 | av_bprint_finalize(&buf, NULL); |
122 | return res; |
123 | } |
124 | |
125 | static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt) |
126 | { |
127 | RealTextContext *rt = s->priv_data; |
128 | return ff_subtitles_queue_read_packet(&rt->q, pkt); |
129 | } |
130 | |
131 | static int realtext_read_seek(AVFormatContext *s, int stream_index, |
132 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
133 | { |
134 | RealTextContext *rt = s->priv_data; |
135 | return ff_subtitles_queue_seek(&rt->q, s, stream_index, |
136 | min_ts, ts, max_ts, flags); |
137 | } |
138 | |
139 | static int realtext_read_close(AVFormatContext *s) |
140 | { |
141 | RealTextContext *rt = s->priv_data; |
142 | ff_subtitles_queue_clean(&rt->q); |
143 | return 0; |
144 | } |
145 | |
146 | AVInputFormat ff_realtext_demuxer = { |
147 | .name = "realtext", |
148 | .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"), |
149 | .priv_data_size = sizeof(RealTextContext), |
150 | .read_probe = realtext_probe, |
151 | .read_header = realtext_read_header, |
152 | .read_packet = realtext_read_packet, |
153 | .read_seek2 = realtext_read_seek, |
154 | .read_close = realtext_read_close, |
155 | .extensions = "rt", |
156 | }; |
157 |