FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/lrcdec.c
Date: 2025-10-12 01:43:37
Exec Total Coverage
Lines: 104 118 88.1%
Functions: 6 6 100.0%
Branches: 69 96 71.9%
Line Branch Exec Source
1 /*
2 * LRC lyrics file format demuxer
3 * Copyright (c) 2014 StarBrilliant <m13253@hotmail.com>
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 <inttypes.h>
23 #include <stdint.h>
24 #include <string.h>
25
26 #include "avformat.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "lrc.h"
30 #include "metadata.h"
31 #include "subtitles.h"
32 #include "libavutil/bprint.h"
33 #include "libavutil/dict.h"
34
35 typedef struct LRCContext {
36 FFDemuxSubtitlesQueue q;
37 int64_t ts_offset; // offset metadata item
38 } LRCContext;
39
40 93 static int64_t find_header(const char *p)
41 {
42 93 int64_t offset = 0;
43
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 93 while(p[offset] == ' ' || p[offset] == '\t') {
44 ✗ offset++;
45 }
46
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 93 if(p[offset] == '[' && p[offset + 1] >= 'a' && p[offset + 1] <= 'z') {
47 15 return offset;
48 } else {
49 78 return -1;
50 }
51 }
52
53 78 static int64_t count_ts(const char *p)
54 {
55 78 int64_t offset = 0;
56 78 int in_brackets = 0;
57
58 for(;;) {
59
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 1457 if(p[offset] == ' ' || p[offset] == '\t') {
60 ✗ offset++;
61
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 1457 } else if(p[offset] == '[') {
62 129 offset++;
63 129 in_brackets++;
64
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 1328 } else if (p[offset] == ']' && in_brackets) {
65 129 offset++;
66 129 in_brackets--;
67
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 1199 } else if(in_brackets &&
68
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 1121 (p[offset] == ':' || p[offset] == '.' || p[offset] == '-' ||
69
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 860 (p[offset] >= '0' && p[offset] <= '9'))) {
70 1121 offset++;
71 } else {
72 break;
73 }
74 }
75 78 return offset;
76 }
77
78 207 static int64_t read_ts(const char *p, int64_t *start)
79 {
80 207 int64_t offset = 0;
81 uint32_t mm;
82 double ss;
83 char prefix[3];
84
85
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 207 while(p[offset] == ' ' || p[offset] == '\t') {
86 ✗ offset++;
87 }
88
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 207 if(p[offset] != '[') {
89 78 return 0;
90 }
91 129 int ret = av_sscanf(p, "%2[[-]%"SCNu32":%lf]", prefix, &mm, &ss);
92
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 129 if (ret != 3 || prefix[0] != '[' || ss < 0 || ss > 60) {
93 ✗ return 0;
94 }
95 129 *start = llrint((mm * 60 + ss) * AV_TIME_BASE);
96
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 129 if (prefix[1] == '-') {
97 3 *start = - *start;
98 }
99 do {
100 1379 offset++;
101
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 1379 } while(p[offset] && p[offset-1] != ']');
102 129 return offset;
103 }
104
105 93 static int64_t read_line(AVBPrint *buf, AVIOContext *pb)
106 {
107 93 int64_t pos = avio_tell(pb);
108
109 93 av_bprint_clear(buf);
110
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 4214 while(!avio_feof(pb)) {
111 4211 int c = avio_r8(pb);
112
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 4211 if(c != '\r') {
113 4211 av_bprint_chars(buf, c, 1);
114 }
115
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 4211 if(c == '\n') {
116 90 break;
117 }
118 }
119 93 return pos;
120 }
121
122 7279 static int lrc_probe(const AVProbeData *p)
123 {
124 7279 int64_t offset = 0;
125 int64_t mm;
126 uint64_t ss, cs;
127 const AVMetadataConv *metadata_item;
128
129
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 7279 if(!memcmp(p->buf, "\xef\xbb\xbf", 3)) { // Skip UTF-8 BOM header
130 9 offset += 3;
131 }
132
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 7286 while(p->buf[offset] == '\n' || p->buf[offset] == '\r') {
133 7 offset++;
134 }
135
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 7279 if(p->buf[offset] != '[') {
136 7270 return 0;
137 }
138 9 offset++;
139 // Common metadata item but not exist in ff_lrc_metadata_conv
140
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 9 if(!memcmp(p->buf + offset, "offset:", 7)) {
141 ✗ return 40;
142 }
143
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 9 if(sscanf(p->buf + offset, "%"SCNd64":%"SCNu64".%"SCNu64"]",
144 &mm, &ss, &cs) == 3) {
145 ✗ return 50;
146 }
147 // Metadata items exist in ff_lrc_metadata_conv
148 9 for(metadata_item = ff_lrc_metadata_conv;
149
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 51 metadata_item->native; metadata_item++) {
150 45 size_t metadata_item_len = strlen(metadata_item->native);
151
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 45 if(p->buf[offset + metadata_item_len] == ':' &&
152
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 3 !memcmp(p->buf + offset, metadata_item->native, metadata_item_len)) {
153 3 return 40;
154 }
155 }
156 6 return 5; // Give it 5 scores since it starts with a bracket
157 }
158
159 3 static int lrc_read_header(AVFormatContext *s)
160 {
161 3 LRCContext *lrc = s->priv_data;
162 AVBPrint line;
163 AVStream *st;
164
165 3 st = avformat_new_stream(s, NULL);
166
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 3 if(!st) {
167 ✗ return AVERROR(ENOMEM);
168 }
169 3 avpriv_set_pts_info(st, 64, 1, AV_TIME_BASE);
170 3 lrc->ts_offset = 0;
171 3 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
172 3 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
173 3 av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
174
175
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 96 while(!avio_feof(s->pb)) {
176 93 int64_t header_offset, pos = read_line(&line, s->pb);
177
178
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 93 if (!av_bprint_is_complete(&line))
179 ✗ goto err_nomem_out;
180 93 header_offset = find_header(line.str);
181
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 93 if(header_offset >= 0) {
182 15 char *comma_offset = strchr(line.str, ':');
183
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 15 if(comma_offset) {
184 15 char *right_bracket_offset = strchr(line.str, ']');
185
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 15 if(!right_bracket_offset) {
186 ✗ continue;
187 }
188
189 15 *right_bracket_offset = *comma_offset = '\0';
190
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 15 if(strcmp(line.str + 1, "offset") ||
191 ✗ sscanf(comma_offset + 1, "%"SCNd64, &lrc->ts_offset) != 1) {
192 15 av_dict_set(&s->metadata, line.str + 1, comma_offset + 1, 0);
193 }
194 15 lrc->ts_offset = av_clip64(lrc->ts_offset, INT64_MIN/4, INT64_MAX/4);
195
196 15 *comma_offset = ':';
197 15 *right_bracket_offset = ']';
198 }
199
200 } else {
201 AVPacket *sub;
202 78 int64_t ts_start = AV_NOPTS_VALUE;
203 78 int64_t ts_stroffset = 0;
204 78 int64_t ts_stroffset_incr = 0;
205 78 int64_t ts_strlength = count_ts(line.str);
206
207 207 while((ts_stroffset_incr = read_ts(line.str + ts_stroffset,
208
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 207 &ts_start)) != 0) {
209 129 ts_start = av_clip64(ts_start, INT64_MIN/4, INT64_MAX/4);
210 129 ts_stroffset += ts_stroffset_incr;
211 129 sub = ff_subtitles_queue_insert(&lrc->q, line.str + ts_strlength,
212 129 line.len - ts_strlength, 0);
213
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 129 if (!sub)
214 ✗ goto err_nomem_out;
215 129 sub->pos = pos;
216 129 sub->pts = ts_start - lrc->ts_offset;
217 129 sub->duration = -1;
218 }
219 }
220 }
221 3 ff_subtitles_queue_finalize(s, &lrc->q);
222 3 ff_metadata_conv_ctx(s, NULL, ff_lrc_metadata_conv);
223 3 av_bprint_finalize(&line, NULL);
224 3 return 0;
225 ✗ err_nomem_out:
226 ✗ av_bprint_finalize(&line, NULL);
227 ✗ return AVERROR(ENOMEM);
228 }
229
230 const FFInputFormat ff_lrc_demuxer = {
231 .p.name = "lrc",
232 .p.long_name = NULL_IF_CONFIG_SMALL("LRC lyrics"),
233 .priv_data_size = sizeof (LRCContext),
234 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
235 .read_probe = lrc_probe,
236 .read_header = lrc_read_header,
237 .read_packet = ff_subtitles_read_packet,
238 .read_close = ff_subtitles_read_close,
239 .read_seek2 = ff_subtitles_read_seek
240 };
241