FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/microdvddec.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 73 85 85.9%
Functions: 6 7 85.7%
Branches: 40 56 71.4%
Line Branch Exec Source
1 /*
2 * MicroDVD subtitle demuxer
3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
4 * Copyright (c) 2012 Clément Bœsch <u pkh me>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "avformat.h"
24 #include "demux.h"
25 #include "internal.h"
26 #include "subtitles.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/opt.h"
29
30 #define MAX_LINESIZE 2048
31
32
33 typedef struct {
34 const AVClass *class;
35 FFDemuxSubtitlesQueue q;
36 AVRational frame_rate;
37 } MicroDVDContext;
38
39
40 7480 static int microdvd_probe(const AVProbeData *p)
41 {
42 unsigned char c;
43 7480 const uint8_t *ptr = p->buf;
44 int i;
45
46
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 7480 if (AV_RB24(ptr) == 0xEFBBBF)
47 9 ptr += 3; /* skip UTF-8 BOM */
48
49
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 7489 for (i=0; i<3; i++) {
50
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 7486 if (sscanf(ptr, "{%*d}{}%c", &c) != 1 &&
51
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 7482 sscanf(ptr, "{%*d}{%*d}%c", &c) != 1 &&
52
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 7479 sscanf(ptr, "{DEFAULT}{}%c", &c) != 1)
53 7477 return 0;
54 9 ptr += ff_subtitles_next_line(ptr);
55 }
56 3 return AVPROBE_SCORE_MAX;
57 }
58
59 70 static int64_t get_pts(const char *buf)
60 {
61 int frame;
62 char c;
63
64
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 70 if (sscanf(buf, "{%d}{%c", &frame, &c) == 2)
65 70 return frame;
66 ✗ return AV_NOPTS_VALUE;
67 }
68
69 70 static int64_t get_duration(const char *buf)
70 {
71 int frame_start, frame_end;
72
73
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 70 if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2)
74 60 return frame_end - (int64_t)frame_start;
75 10 return -1;
76 }
77
78 static const char *bom = "\xEF\xBB\xBF";
79
80 3 static int microdvd_read_header(AVFormatContext *s)
81 {
82 3 AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */
83 3 MicroDVDContext *microdvd = s->priv_data;
84 3 AVStream *st = avformat_new_stream(s, NULL);
85 3 int i = 0, ret;
86 char line_buf[MAX_LINESIZE];
87 3 int has_real_fps = 0;
88
89
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 3 if (!st)
90 ✗ return AVERROR(ENOMEM);
91
92
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 77 while (!avio_feof(s->pb)) {
93 char *p;
94 AVPacket *sub;
95 77 int64_t pos = avio_tell(s->pb);
96 77 int len = ff_get_line(s->pb, line_buf, sizeof(line_buf));
97 77 char *line = line_buf;
98 int64_t pts;
99
100
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 77 if (!strncmp(line, bom, 3))
101 ✗ line += 3;
102 77 p = line;
103
104
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 77 if (!len)
105 3 break;
106 74 line[strcspn(line, "\r\n")] = 0;
107
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 74 if (!*p)
108 ✗ continue;
109
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 74 if (i++ < 3) {
110 int frame;
111 double fps;
112 char c;
113
114
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 9 if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 ||
115
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 7 sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2)
116
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 2 && frame <= 1 && fps > 3 && fps < 100) {
117 2 pts_info = av_d2q(fps, 100000);
118 2 has_real_fps = 1;
119 4 continue;
120 }
121
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 7 if (!st->codecpar->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
122 2 int size = strlen(line + 11);
123 2 ret = ff_alloc_extradata(st->codecpar, size);
124
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 2 if (ret < 0)
125 ✗ return ret;
126 2 memcpy(st->codecpar->extradata, line + 11, size);
127 2 continue;
128 }
129 }
130 #define SKIP_FRAME_ID \
131 p = strchr(p, '}'); \
132 if (!p) { \
133 av_log(s, AV_LOG_WARNING, "Invalid event \"%s\"" \
134 " at line %d\n", line, i); \
135 continue; \
136 } \
137 p++
138
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 70 SKIP_FRAME_ID;
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 70 SKIP_FRAME_ID;
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 70 if (!*p)
141 ✗ continue;
142 70 pts = get_pts(line);
143
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 70 if (pts == AV_NOPTS_VALUE)
144 ✗ continue;
145 70 sub = ff_subtitles_queue_insert(&microdvd->q, p, strlen(p), 0);
146
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 70 if (!sub)
147 ✗ return AVERROR(ENOMEM);
148 70 sub->pos = pos;
149 70 sub->pts = pts;
150 70 sub->duration = get_duration(line);
151 }
152 3 ff_subtitles_queue_finalize(s, &microdvd->q);
153
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 3 if (has_real_fps) {
154 /* export the FPS info only if set in the file */
155 2 microdvd->frame_rate = pts_info;
156
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 1 } else if (microdvd->frame_rate.num) {
157 /* fallback on user specified frame rate */
158 ✗ pts_info = microdvd->frame_rate;
159 }
160 3 avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
161 3 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
162 3 st->codecpar->codec_id = AV_CODEC_ID_MICRODVD;
163 3 return 0;
164 }
165
166 73 static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)
167 {
168 73 MicroDVDContext *microdvd = s->priv_data;
169 73 return ff_subtitles_queue_read_packet(&microdvd->q, pkt);
170 }
171
172 ✗ static int microdvd_read_seek(AVFormatContext *s, int stream_index,
173 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
174 {
175 ✗ MicroDVDContext *microdvd = s->priv_data;
176 ✗ return ff_subtitles_queue_seek(&microdvd->q, s, stream_index,
177 min_ts, ts, max_ts, flags);
178 }
179
180 3 static int microdvd_read_close(AVFormatContext *s)
181 {
182 3 MicroDVDContext *microdvd = s->priv_data;
183 3 ff_subtitles_queue_clean(&microdvd->q);
184 3 return 0;
185 }
186
187
188 #define OFFSET(x) offsetof(MicroDVDContext, x)
189 #define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
190 static const AVOption microdvd_options[] = {
191 { "subfps", "set the movie frame rate fallback", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, SD },
192 { NULL }
193 };
194
195 static const AVClass microdvd_class = {
196 .class_name = "microdvddec",
197 .item_name = av_default_item_name,
198 .option = microdvd_options,
199 .version = LIBAVUTIL_VERSION_INT,
200 };
201
202 const FFInputFormat ff_microdvd_demuxer = {
203 .p.name = "microdvd",
204 .p.long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
205 .p.priv_class = &microdvd_class,
206 .priv_data_size = sizeof(MicroDVDContext),
207 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
208 .read_probe = microdvd_probe,
209 .read_header = microdvd_read_header,
210 .read_packet = microdvd_read_packet,
211 .read_seek2 = microdvd_read_seek,
212 .read_close = microdvd_read_close,
213 };
214