FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/subviewerdec.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 84 98 85.7%
Functions: 4 4 100.0%
Branches: 56 78 71.8%
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 * SubViewer subtitle demuxer
24 * @see https://en.wikipedia.org/wiki/SubViewer
25 */
26
27 #include "avformat.h"
28 #include "demux.h"
29 #include "internal.h"
30 #include "subtitles.h"
31 #include "avio_internal.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/bprint.h"
34 #include "libavutil/intreadwrite.h"
35
36 typedef struct {
37 FFDemuxSubtitlesQueue q;
38 } SubViewerContext;
39
40 7186 static int subviewer_probe(const AVProbeData *p)
41 {
42 char c;
43 7186 const unsigned char *ptr = p->buf;
44
45
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 7186 if (AV_RB24(ptr) == 0xEFBBBF)
46 9 ptr += 3; /* skip UTF-8 BOM */
47
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 7186 if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1)
48 ✗ return AVPROBE_SCORE_EXTENSION;
49
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 7186 if (!strncmp(ptr, "[INFORMATION]", 13))
50 1 return AVPROBE_SCORE_MAX/3;
51 7185 return 0;
52 }
53
54 6 static int get_multiplier(int e) {
55
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 6 switch (e) {
56 ✗ case 1 : return 100;
57 6 case 2 : return 10;
58 ✗ case 3 : return 1;
59 ✗ default : return -1;
60 }
61 }
62
63 9 static int read_ts(const char *s, int64_t *start, int *duration)
64 {
65 int64_t end;
66 int hh1, mm1, ss1, ms1;
67 int hh2, mm2, ss2, ms2;
68 int multiplier1, multiplier2;
69 int ms1p1, ms1p2, ms2p1, ms2p2;
70
71
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 9 if (sscanf(s, "%u:%u:%u.%n%u%n,%u:%u:%u.%n%u%n",
72 &hh1, &mm1, &ss1, &ms1p1, &ms1, &ms1p2, &hh2, &mm2, &ss2, &ms2p1, &ms2, &ms2p2) == 8) {
73 3 multiplier1 = get_multiplier(ms1p2 - ms1p1);
74 3 multiplier2 = get_multiplier(ms2p2 - ms2p1);
75
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 3 if (multiplier1 <= 0 ||multiplier2 <= 0)
76 ✗ return -1;
77
78 3 end = (hh2*3600LL + mm2*60LL + ss2) * 1000LL + ms2 * multiplier2;
79 3 *start = (hh1*3600LL + mm1*60LL + ss1) * 1000LL + ms1 * multiplier1;
80 3 *duration = end - *start;
81 3 return 0;
82 }
83 6 return -1;
84 }
85
86 1 static int subviewer_read_header(AVFormatContext *s)
87 {
88 1 SubViewerContext *subviewer = s->priv_data;
89 1 AVStream *st = avformat_new_stream(s, NULL);
90 AVBPrint header;
91 1 int res = 0, new_event = 1;
92 1 int64_t pts_start = AV_NOPTS_VALUE;
93 1 int duration = -1;
94 1 AVPacket *sub = NULL;
95
96
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 1 if (!st)
97 ✗ return AVERROR(ENOMEM);
98 1 res = ffio_ensure_seekback(s->pb, 3);
99
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 1 if (res < 0)
100 ✗ return res;
101
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 1 if (avio_rb24(s->pb) != 0xefbbbf)
102 1 avio_seek(s->pb, -3, SEEK_CUR);
103 1 avpriv_set_pts_info(st, 64, 1, 1000);
104 1 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
105 1 st->codecpar->codec_id = AV_CODEC_ID_SUBVIEWER;
106
107 1 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
108
109
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 21 while (!avio_feof(s->pb)) {
110 char line[2048];
111 21 int64_t pos = 0;
112 21 int len = ff_get_line(s->pb, line, sizeof(line));
113
114
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 21 if (!len)
115 1 break;
116
117 20 line[strcspn(line, "\r\n")] = 0;
118
119
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 20 if (line[0] == '[' && strncmp(line, "[br]", 4)) {
120
121 /* ignore event style, XXX: add to side_data? */
122
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 11 if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") ||
123
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 9 strstr(line, "[FONT]") || strstr(line, "[STYLE]"))
124 2 continue;
125
126
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 9 if (!st->codecpar->extradata) { // header not finalized yet
127 8 av_bprintf(&header, "%s\n", line);
128
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 8 if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) {
129 /* end of header */
130 1 res = ff_bprint_to_codecpar_extradata(st->codecpar, &header);
131
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 1 if (res < 0)
132 ✗ goto end;
133
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 7 } else if (strncmp(line, "[INFORMATION]", 13)) {
134 /* assume file metadata at this point */
135 6 int i, j = 0;
136 char key[32], value[128];
137
138
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 43 for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++)
139 37 key[i - 1] = av_tolower(line[i]);
140 6 key[i - 1] = 0;
141
142
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 6 if (line[i] == ']')
143 6 i++;
144
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 12 while (line[i] == ' ')
145 6 i++;
146
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 78 while (j < sizeof(value) - 1 && line[i] && line[i] != ']')
147 72 value[j++] = line[i++];
148 6 value[j] = 0;
149
150 6 av_dict_set(&s->metadata, key, value, 0);
151 }
152 }
153
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 9 } else if (read_ts(line, &pts_start, &duration) >= 0) {
154 3 new_event = 1;
155 3 pos = avio_tell(s->pb);
156
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 6 } else if (*line) {
157
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 5 if (pts_start == AV_NOPTS_VALUE) {
158 ✗ res = AVERROR_INVALIDDATA;
159 ✗ goto end;
160 }
161
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 5 if (!new_event) {
162 2 sub = ff_subtitles_queue_insert(&subviewer->q, "\n", 1, 1);
163
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 2 if (!sub) {
164 ✗ res = AVERROR(ENOMEM);
165 ✗ goto end;
166 }
167 }
168 5 sub = ff_subtitles_queue_insert(&subviewer->q, line, strlen(line), !new_event);
169
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 5 if (!sub) {
170 ✗ res = AVERROR(ENOMEM);
171 ✗ goto end;
172 }
173
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 5 if (new_event) {
174 3 sub->pos = pos;
175 3 sub->pts = pts_start;
176 3 sub->duration = duration;
177 }
178 5 new_event = 0;
179 }
180 }
181
182 1 ff_subtitles_queue_finalize(s, &subviewer->q);
183
184 1 end:
185 1 av_bprint_finalize(&header, NULL);
186 1 return res;
187 }
188
189 const FFInputFormat ff_subviewer_demuxer = {
190 .p.name = "subviewer",
191 .p.long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"),
192 .p.extensions = "sub",
193 .priv_data_size = sizeof(SubViewerContext),
194 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
195 .read_probe = subviewer_probe,
196 .read_header = subviewer_read_header,
197 .read_packet = ff_subtitles_read_packet,
198 .read_seek2 = ff_subtitles_read_seek,
199 .read_close = ff_subtitles_read_close,
200 };
201