FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/realtextdec.c
Date: 2026-10-20 10:20:17
Exec Total Coverage
Lines: 51 61 83.6%
Functions: 3 3 100.0%
Branches: 30 42 71.4%
Line Branch Exec Source
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 "demux.h"
29 #include "internal.h"
30 #include "subtitles.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/bprint.h"
33 #include "libavutil/mem.h"
34
35 typedef struct {
36 FFDemuxSubtitlesQueue q;
37 } RealTextContext;
38
39 8203 static int realtext_probe(const AVProbeData *p)
40 {
41 char buf[7];
42 FFTextReader tr;
43 8203 ff_text_init_buf(&tr, p->buf, p->buf_size);
44 8203 ff_text_read(&tr, buf, sizeof(buf));
45
46
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 8203 return !av_strncasecmp(buf, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0;
47 }
48
49 7 static int64_t read_ts(const char *s)
50 {
51 int hh, mm, ss, ms;
52
53
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 7 if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600LL + mm*60LL + ss) * 100LL + ms;
54
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 6 if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600LL + mm*60LL + ss) * 100LL;
55
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 6 if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60LL + ss) * 100LL + ms;
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 6 if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60LL + ss) * 100LL;
57
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 5 if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100LL + ms;
58 4 return strtoll(s, NULL, 10) * 100ULL;
59 }
60
61 1 static int realtext_read_header(AVFormatContext *s)
62 {
63 1 RealTextContext *rt = s->priv_data;
64 1 AVStream *st = avformat_new_stream(s, NULL);
65 AVBPrint buf;
66 1 char c = 0;
67 1 int res = 0;
68 1 int64_t duration = read_ts("60"); // default duration is 60 seconds
69 FFTextReader tr;
70 1 ff_text_init_avio(s, &tr, s->pb);
71
72
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 1 if (!st)
73 ✗ return AVERROR(ENOMEM);
74 1 avpriv_set_pts_info(st, 64, 1, 100);
75 1 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
76 1 st->codecpar->codec_id = AV_CODEC_ID_REALTEXT;
77
78 1 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
79
80
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 17 while (!ff_text_eof(&tr)) {
81 AVPacket *sub;
82 16 const int64_t pos = ff_text_pos(&tr) - (c != 0);
83 16 int n = ff_smil_extract_next_text_chunk(&tr, &buf, &c);
84
85
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 16 if (n < 0) {
86 ✗ res = n;
87 ✗ goto end;
88 }
89
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 16 if (n == 0)
90 ✗ break;
91
92
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 16 if (!av_strncasecmp(buf.str, "<window", 7)) {
93 /* save header to extradata */
94 1 const char *p = ff_smil_get_attr_ptr(buf.str, "duration");
95
96
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 1 if (st->codecpar->extradata) {
97 ✗ res = AVERROR_INVALIDDATA;
98 ✗ goto end;
99 }
100
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 1 if (p)
101 1 duration = read_ts(p);
102 1 st->codecpar->extradata = av_strdup(buf.str);
103
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 1 if (!st->codecpar->extradata) {
104 ✗ res = AVERROR(ENOMEM);
105 ✗ goto end;
106 }
107 1 st->codecpar->extradata_size = buf.len + 1;
108 } else {
109 /* if we just read a <time> tag, introduce a new event, otherwise merge
110 * with the previous one */
111 15 int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1;
112 15 sub = ff_subtitles_queue_insert_bprint(&rt->q, &buf, merge);
113
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 15 if (!sub) {
114 ✗ res = AVERROR(ENOMEM);
115 ✗ goto end;
116 }
117
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 15 if (!merge) {
118 4 const char *begin = ff_smil_get_attr_ptr(buf.str, "begin");
119 4 const char *end = ff_smil_get_attr_ptr(buf.str, "end");
120
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 4 int64_t endi = end ? read_ts(end) : 0;
121
122 4 sub->pos = pos;
123
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 4 sub->pts = begin ? read_ts(begin) : 0;
124
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 4 sub->duration = (end && endi > sub->pts && endi - (uint64_t)sub->pts <= INT64_MAX) ? endi - sub->pts : duration;
125 }
126 }
127 16 av_bprint_clear(&buf);
128 }
129 1 ff_subtitles_queue_finalize(s, &rt->q);
130
131 1 end:
132 1 av_bprint_finalize(&buf, NULL);
133 1 return res;
134 }
135
136 const FFInputFormat ff_realtext_demuxer = {
137 .p.name = "realtext",
138 .p.long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"),
139 .p.extensions = "rt",
140 .priv_data_size = sizeof(RealTextContext),
141 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
142 .read_probe = realtext_probe,
143 .read_header = realtext_read_header,
144 .read_packet = ff_subtitles_read_packet,
145 .read_seek2 = ff_subtitles_read_seek,
146 .read_close = ff_subtitles_read_close,
147 };
148