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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 | * 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; | |
f6fa7814 | 68 | ff_text_init_avio(s, &tr, s->pb); |
2ba45a60 DM |
69 | |
70 | if (!st) | |
71 | return AVERROR(ENOMEM); | |
72 | avpriv_set_pts_info(st, 64, 1, 100); | |
73 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
74 | st->codec->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->codec->extradata = av_strdup(buf.str); | |
93 | if (!st->codec->extradata) { | |
94 | res = AVERROR(ENOMEM); | |
95 | goto end; | |
96 | } | |
97 | st->codec->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(&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 | }; |