FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/mpsubdec.c
Date: 2026-05-02 03:33:10
Exec Total Coverage
Lines: 74 86 86.0%
Functions: 3 3 100.0%
Branches: 43 62 69.4%
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 * MPlayer subtitles format demuxer
24 */
25
26 #include "avformat.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "subtitles.h"
30
31 #define TSBASE 10000000
32
33 typedef struct {
34 FFDemuxSubtitlesQueue q;
35 } MPSubContext;
36
37 7480 static int mpsub_probe(const AVProbeData *p)
38 {
39 7480 const char *ptr = p->buf;
40 7480 const char *ptr_end = p->buf + p->buf_size;
41
42
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 18656 while (ptr < ptr_end) {
43 int inc;
44
45
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 18560 if (!memcmp(ptr, "FORMAT=TIME", 11))
46 1 return AVPROBE_SCORE_EXTENSION;
47
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 18559 if (!memcmp(ptr, "FORMAT=", 7))
48 2 return AVPROBE_SCORE_EXTENSION / 3;
49 18557 inc = ff_subtitles_next_line(ptr);
50
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 18557 if (!inc)
51 7381 break;
52 11176 ptr += inc;
53 }
54 7477 return 0;
55 }
56
57 42 static int parse_line(const char *line, int64_t *value, int64_t *value2)
58 {
59 int vi, p1, p2;
60
61
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 88 for (vi = 0; vi < 2; vi++) {
62 long long intval, fracval;
63 65 int n = av_sscanf(line, "%lld%n.%lld%n", &intval, &p1, &fracval, &p2);
64
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 65 if (n <= 0 || intval < INT64_MIN / TSBASE || intval > INT64_MAX / TSBASE)
65 19 return AVERROR_INVALIDDATA;
66
67 46 intval *= TSBASE;
68
69
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 46 if (n == 2) {
70
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 5 if (fracval < 0)
71 ✗ return AVERROR_INVALIDDATA;
72
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 35 for (;p2 - p1 < 7 + 1; p1--)
73 30 fracval *= 10;
74
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 5 for (;p2 - p1 > 7 + 1; p1++)
75 ✗ fracval /= 10;
76
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 5 if (intval > 0) intval = av_sat_add64(intval, fracval);
77 ✗ else intval = av_sat_sub64(intval, fracval);
78 5 line += p2;
79 } else
80 41 line += p1;
81
82 46 *value = intval;
83
84 46 value = value2;
85 }
86
87 23 return 0;
88 }
89
90 2 static int mpsub_read_header(AVFormatContext *s)
91 {
92 2 MPSubContext *mpsub = s->priv_data;
93 AVStream *st;
94 AVBPrint buf;
95 2 AVRational pts_info = (AVRational){ TSBASE, 1 }; // ts based by default
96 2 int res = 0;
97 2 int64_t current_pts = 0;
98 int i;
99 2 int common_factor = 0;
100
101 2 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
102
103
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 45 while (!avio_feof(s->pb)) {
104 char line[1024];
105 int64_t start, duration;
106 43 int fps, len = ff_get_line(s->pb, line, sizeof(line));
107
108
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 43 if (!len)
109 ✗ break;
110
111 43 line[strcspn(line, "\r\n")] = 0;
112
113
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 43 if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) {
114 /* frame based timing */
115 1 pts_info = (AVRational){ TSBASE * fps, 1 };
116
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 42 } else if (parse_line(line, &start, &duration) >= 0) {
117 AVPacket *sub;
118 23 const int64_t pos = avio_tell(s->pb);
119
120 23 res = ff_subtitles_read_chunk(s->pb, &buf);
121
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 23 if (res < 0) goto end;
122
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 23 if (buf.len) {
123 23 sub = ff_subtitles_queue_insert_bprint(&mpsub->q, &buf, 0);
124
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 23 if (!sub) {
125 ✗ res = AVERROR(ENOMEM);
126 ✗ goto end;
127 }
128
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 23 if ( current_pts < 0 && start < INT64_MIN - current_pts
129
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 23 || current_pts > 0 && start > INT64_MAX - current_pts) {
130 ✗ res = AVERROR_INVALIDDATA;
131 ✗ goto end;
132 }
133 23 sub->pts = current_pts + start;
134
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 23 if (duration < 0 || sub->pts > INT64_MAX - duration) {
135 ✗ res = AVERROR_INVALIDDATA;
136 ✗ goto end;
137 }
138 23 sub->duration = duration;
139
140 23 common_factor = av_gcd(duration, common_factor);
141 23 common_factor = av_gcd(sub->pts, common_factor);
142
143 23 current_pts = sub->pts + duration;
144 23 sub->pos = pos;
145 }
146 }
147 }
148
149
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 2 if (common_factor > 1) {
150 2 common_factor = av_gcd(pts_info.num, common_factor);
151
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 25 for (i = 0; i < mpsub->q.nb_subs; i++) {
152 23 mpsub->q.subs[i]->pts /= common_factor;
153 23 mpsub->q.subs[i]->duration /= common_factor;
154 }
155 2 pts_info.num /= common_factor;
156 }
157
158 2 st = avformat_new_stream(s, NULL);
159
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 2 if (!st) {
160 ✗ res = AVERROR(ENOMEM);
161 ✗ goto end;
162 }
163 2 avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
164 2 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
165 2 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
166
167 2 ff_subtitles_queue_finalize(s, &mpsub->q);
168
169 2 end:
170 2 av_bprint_finalize(&buf, NULL);
171 2 return res;
172 }
173
174 const FFInputFormat ff_mpsub_demuxer = {
175 .p.name = "mpsub",
176 .p.long_name = NULL_IF_CONFIG_SMALL("MPlayer subtitles"),
177 .p.extensions = "sub",
178 .priv_data_size = sizeof(MPSubContext),
179 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
180 .read_probe = mpsub_probe,
181 .read_header = mpsub_read_header,
182 .read_packet = ff_subtitles_read_packet,
183 .read_seek2 = ff_subtitles_read_seek,
184 .read_close = ff_subtitles_read_close,
185 };
186