FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/mpsubdec.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 73 85 85.9%
Functions: 3 3 100.0%
Branches: 42 60 70.0%

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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 * MPlayer subtitles format demuxer
24 */
25
26 #include "avformat.h"
27 #include "internal.h"
28 #include "subtitles.h"
29
30 #define TSBASE 10000000
31
32 typedef struct {
33 FFDemuxSubtitlesQueue q;
34 } MPSubContext;
35
36 6782 static int mpsub_probe(const AVProbeData *p)
37 {
38 6782 const char *ptr = p->buf;
39 6782 const char *ptr_end = p->buf + p->buf_size;
40
41
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16593 while (ptr < ptr_end) {
42 int inc;
43
44
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16506 if (!memcmp(ptr, "FORMAT=TIME", 11))
45 1 return AVPROBE_SCORE_EXTENSION;
46
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16505 if (!memcmp(ptr, "FORMAT=", 7))
47 2 return AVPROBE_SCORE_EXTENSION / 3;
48 16503 inc = ff_subtitles_next_line(ptr);
49
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16503 if (!inc)
50 6692 break;
51 9811 ptr += inc;
52 }
53 6779 return 0;
54 }
55
56 42 static int parse_line(const char *line, int64_t *value, int64_t *value2)
57 {
58 int vi, p1, p2;
59
60
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88 for (vi = 0; vi < 2; vi++) {
61 long long intval, fracval;
62 65 int n = av_sscanf(line, "%lld%n.%lld%n", &intval, &p1, &fracval, &p2);
63
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65 if (n <= 0 || intval < INT64_MIN / TSBASE || intval > INT64_MAX / TSBASE)
64 19 return AVERROR_INVALIDDATA;
65
66 46 intval *= TSBASE;
67
68
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46 if (n == 2) {
69
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5 if (fracval < 0)
70 return AVERROR_INVALIDDATA;
71
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35 for (;p2 - p1 < 7 + 1; p1--)
72 30 fracval *= 10;
73
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5 for (;p2 - p1 > 7 + 1; p1++)
74 fracval /= 10;
75
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5 if (intval > 0) intval = av_sat_add64(intval, fracval);
76 else intval = av_sat_sub64(intval, fracval);
77 5 line += p2;
78 } else
79 41 line += p1;
80
81 46 *value = intval;
82
83 46 value = value2;
84 }
85
86 23 return 0;
87 }
88
89 2 static int mpsub_read_header(AVFormatContext *s)
90 {
91 2 MPSubContext *mpsub = s->priv_data;
92 AVStream *st;
93 AVBPrint buf;
94 2 AVRational pts_info = (AVRational){ TSBASE, 1 }; // ts based by default
95 2 int res = 0;
96 2 int64_t current_pts = 0;
97 int i;
98 2 int common_factor = 0;
99
100 2 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
101
102
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45 while (!avio_feof(s->pb)) {
103 char line[1024];
104 int64_t start, duration;
105 43 int fps, len = ff_get_line(s->pb, line, sizeof(line));
106
107
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43 if (!len)
108 break;
109
110 43 line[strcspn(line, "\r\n")] = 0;
111
112
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43 if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) {
113 /* frame based timing */
114 1 pts_info = (AVRational){ TSBASE * fps, 1 };
115
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42 } else if (parse_line(line, &start, &duration) >= 0) {
116 AVPacket *sub;
117 23 const int64_t pos = avio_tell(s->pb);
118
119 23 ff_subtitles_read_chunk(s->pb, &buf);
120
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23 if (buf.len) {
121 23 sub = ff_subtitles_queue_insert(&mpsub->q, buf.str, buf.len, 0);
122
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23 if (!sub) {
123 res = AVERROR(ENOMEM);
124 goto end;
125 }
126
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23 if ( current_pts < 0 && start < INT64_MIN - current_pts
127
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23 || current_pts > 0 && start > INT64_MAX - current_pts) {
128 res = AVERROR_INVALIDDATA;
129 goto end;
130 }
131 23 sub->pts = current_pts + start;
132
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23 if (duration < 0 || sub->pts > INT64_MAX - duration) {
133 res = AVERROR_INVALIDDATA;
134 goto end;
135 }
136 23 sub->duration = duration;
137
138 23 common_factor = av_gcd(duration, common_factor);
139 23 common_factor = av_gcd(sub->pts, common_factor);
140
141 23 current_pts = sub->pts + duration;
142 23 sub->pos = pos;
143 }
144 }
145 }
146
147
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2 if (common_factor > 1) {
148 2 common_factor = av_gcd(pts_info.num, common_factor);
149
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25 for (i = 0; i < mpsub->q.nb_subs; i++) {
150 23 mpsub->q.subs[i]->pts /= common_factor;
151 23 mpsub->q.subs[i]->duration /= common_factor;
152 }
153 2 pts_info.num /= common_factor;
154 }
155
156 2 st = avformat_new_stream(s, NULL);
157
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2 if (!st) {
158 res = AVERROR(ENOMEM);
159 goto end;
160 }
161 2 avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
162 2 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
163 2 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
164
165 2 ff_subtitles_queue_finalize(s, &mpsub->q);
166
167 2 end:
168 2 av_bprint_finalize(&buf, NULL);
169 2 return res;
170 }
171
172 const AVInputFormat ff_mpsub_demuxer = {
173 .name = "mpsub",
174 .long_name = NULL_IF_CONFIG_SMALL("MPlayer subtitles"),
175 .priv_data_size = sizeof(MPSubContext),
176 .flags_internal = FF_FMT_INIT_CLEANUP,
177 .read_probe = mpsub_probe,
178 .read_header = mpsub_read_header,
179 .extensions = "sub",
180 .read_packet = ff_subtitles_read_packet,
181 .read_seek2 = ff_subtitles_read_seek,
182 .read_close = ff_subtitles_read_close,
183 };
184