FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/sccdec.c
Date: 2026-04-22 18:56:46
Exec Total Coverage
Lines: 56 70 80.0%
Functions: 3 3 100.0%
Branches: 28 42 66.7%
Line Branch Exec Source
1 /*
2 * SCC subtitle demuxer
3 * Copyright (c) 2017 Paul B Mahol
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avformat.h"
23 #include "demux.h"
24 #include "internal.h"
25 #include "subtitles.h"
26 #include "libavutil/avstring.h"
27 #include "libavutil/intreadwrite.h"
28
29 typedef struct SCCContext {
30 FFDemuxSubtitlesQueue q;
31 } SCCContext;
32
33 7474 static int scc_probe(const AVProbeData *p)
34 {
35 char buf[18];
36 FFTextReader tr;
37
38 7474 ff_text_init_buf(&tr, p->buf, p->buf_size);
39
40
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 7481 while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n')
41 7 ff_text_r8(&tr);
42
43 7474 ff_text_read(&tr, buf, sizeof(buf));
44
45
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 7474 if (!memcmp(buf, "Scenarist_SCC V1.0", 18))
46 3 return AVPROBE_SCORE_MAX;
47
48 7471 return 0;
49 }
50
51 34176 static int convert(uint8_t x)
52 {
53
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 34176 if (x >= 'a')
54 8448 x -= 'a' - 10;
55
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 25728 else if (x >= 'A')
56 ✗ x -= 'A' - 10;
57 else
58 25728 x -= '0';
59 34176 return x;
60 }
61
62 3 static int scc_read_header(AVFormatContext *s)
63 {
64 3 SCCContext *scc = s->priv_data;
65 3 AVStream *st = avformat_new_stream(s, NULL);
66 3 AVPacket *sub = NULL;
67 ptrdiff_t len;
68 uint8_t out[4096];
69 FFTextReader tr;
70
71 3 ff_text_init_avio(s, &tr, s->pb);
72
73
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 3 if (!st)
74 ✗ return AVERROR(ENOMEM);
75 3 avpriv_set_pts_info(st, 64, 1, 1000);
76 3 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
77 3 st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
78
79 729 while (1) {
80 732 char *saveptr = NULL, *lline;
81 int hh, mm, ss, fs, i;
82 char line[4096];
83 int64_t pos, ts;
84
85 732 pos = ff_text_pos(&tr);
86 732 len = ff_subtitles_read_line(&tr, line, sizeof(line));
87
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 732 if (len <= 13) {
88
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 366 if (ff_text_eof(&tr))
89 3 break;
90 369 continue;
91 }
92
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 366 if (av_sscanf(line, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) != 4)
93 6 continue;
94
95 360 ts = (hh * 3600LL + mm * 60LL + ss) * 1000LL + fs * 33LL;
96
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 360 if (sub)
97 357 sub->duration = ts - sub->pts;
98
99 360 lline = line;
100 360 lline += 12;
101
102
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 8904 for (i = 0; i < 4095; i += 3) {
103 8904 char *ptr = av_strtok(lline, " ", &saveptr);
104 char c1, c2, c3, c4;
105 uint8_t o1, o2;
106
107
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 8904 if (!ptr)
108 360 break;
109
110
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 8544 if (av_sscanf(ptr, "%c%c%c%c", &c1, &c2, &c3, &c4) != 4)
111 ✗ break;
112 8544 o1 = convert(c2) | (convert(c1) << 4);
113 8544 o2 = convert(c4) | (convert(c3) << 4);
114
115 8544 lline = NULL;
116
117
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 8544 if (i > 12 && o1 == 0x94 && o2 == 0x20 && saveptr &&
118 ✗ (av_strncasecmp(saveptr, "942f", 4) && !av_strncasecmp(saveptr, "942c", 4))) {
119
120 ✗ sub = ff_subtitles_queue_insert(&scc->q, out, i, 0);
121 ✗ if (!sub)
122 ✗ return AVERROR(ENOMEM);
123
124 ✗ sub->pos = pos;
125 ✗ pos += i;
126 ✗ sub->pts = ts;
127 ✗ sub->duration = i * 11;
128 ✗ ts += sub->duration;
129 ✗ i = 0;
130 }
131
132 8544 out[i+0] = 0xfc;
133 8544 out[i+1] = o1;
134 8544 out[i+2] = o2;
135 }
136
137 360 sub = ff_subtitles_queue_insert(&scc->q, out, i, 0);
138
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 360 if (!sub)
139 ✗ return AVERROR(ENOMEM);
140
141 360 sub->pos = pos;
142 360 sub->pts = ts;
143 }
144
145 3 ff_subtitles_queue_finalize(s, &scc->q);
146
147 3 return 0;
148 }
149
150 const FFInputFormat ff_scc_demuxer = {
151 .p.name = "scc",
152 .p.long_name = NULL_IF_CONFIG_SMALL("Scenarist Closed Captions"),
153 .p.extensions = "scc",
154 .priv_data_size = sizeof(SCCContext),
155 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
156 .read_probe = scc_probe,
157 .read_header = scc_read_header,
158 .read_packet = ff_subtitles_read_packet,
159 .read_seek2 = ff_subtitles_read_seek,
160 .read_close = ff_subtitles_read_close,
161 };
162