1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "flac_metadata.h"
#include "replay_gain.h"
#include "tag.h"
#include <glib.h>
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
static bool
flac_find_float_comment(const FLAC__StreamMetadata *block,
const char *cmnt, float *fl)
{
int offset;
size_t pos;
int len;
unsigned char tmp, *p;
offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
cmnt);
if (offset < 0)
return false;
pos = strlen(cmnt) + 1; /* 1 is for '=' */
len = block->data.vorbis_comment.comments[offset].length - pos;
if (len <= 0)
return false;
p = &block->data.vorbis_comment.comments[offset].entry[pos];
tmp = p[len];
p[len] = '\0';
*fl = (float)atof((char *)p);
p[len] = tmp;
return true;
}
struct replay_gain_info *
flac_parse_replay_gain(const FLAC__StreamMetadata *block)
{
struct replay_gain_info *rgi;
bool found = false;
rgi = replay_gain_info_new();
found = flac_find_float_comment(block, "replaygain_album_gain",
&rgi->tuples[REPLAY_GAIN_ALBUM].gain) ||
flac_find_float_comment(block, "replaygain_album_peak",
&rgi->tuples[REPLAY_GAIN_ALBUM].peak) ||
flac_find_float_comment(block, "replaygain_track_gain",
&rgi->tuples[REPLAY_GAIN_TRACK].gain) ||
flac_find_float_comment(block, "replaygain_track_peak",
&rgi->tuples[REPLAY_GAIN_TRACK].peak);
if (!found) {
replay_gain_info_free(rgi);
rgi = NULL;
}
return rgi;
}
/**
* Checks if the specified name matches the entry's name, and if yes,
* returns the comment value (not null-temrinated).
*/
static const char *
flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
const char *name, const char *char_tnum, size_t *length_r)
{
size_t name_length = strlen(name);
size_t char_tnum_length = 0;
const char *comment = (const char*)entry->entry;
if (entry->length <= name_length ||
g_ascii_strncasecmp(comment, name, name_length) != 0)
return NULL;
if (char_tnum != NULL) {
char_tnum_length = strlen(char_tnum);
if (entry->length > name_length + char_tnum_length + 2 &&
comment[name_length] == '[' &&
g_ascii_strncasecmp(comment + name_length + 1,
char_tnum, char_tnum_length) == 0 &&
comment[name_length + char_tnum_length + 1] == ']')
name_length = name_length + char_tnum_length + 2;
else if (entry->length > name_length + char_tnum_length &&
g_ascii_strncasecmp(comment + name_length,
char_tnum, char_tnum_length) == 0)
name_length = name_length + char_tnum_length;
}
if (comment[name_length] == '=') {
*length_r = entry->length - name_length - 1;
return comment + name_length + 1;
}
return NULL;
}
/**
* Check if the comment's name equals the passed name, and if so, copy
* the comment value into the tag.
*/
static bool
flac_copy_comment(struct tag *tag,
const FLAC__StreamMetadata_VorbisComment_Entry *entry,
const char *name, enum tag_type tag_type,
const char *char_tnum)
{
const char *value;
size_t value_length;
value = flac_comment_value(entry, name, char_tnum, &value_length);
if (value != NULL) {
tag_add_item_n(tag, tag_type, value, value_length);
return true;
}
return false;
}
/* tracknumber is used in VCs, MPD uses "track" ..., all the other
* tag names match */
static const char *VORBIS_COMMENT_TRACK_KEY = "tracknumber";
static const char *VORBIS_COMMENT_DISC_KEY = "discnumber";
static void
flac_parse_comment(struct tag *tag, const char *char_tnum,
const FLAC__StreamMetadata_VorbisComment_Entry *entry)
{
assert(tag != NULL);
if (flac_copy_comment(tag, entry, VORBIS_COMMENT_TRACK_KEY,
TAG_TRACK, char_tnum) ||
flac_copy_comment(tag, entry, VORBIS_COMMENT_DISC_KEY,
TAG_DISC, char_tnum) ||
flac_copy_comment(tag, entry, "album artist",
TAG_ALBUM_ARTIST, char_tnum))
return;
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (flac_copy_comment(tag, entry,
tag_item_names[i], i, char_tnum))
return;
}
void
flac_vorbis_comments_to_tag(struct tag *tag, const char *char_tnum,
const FLAC__StreamMetadata_VorbisComment *comment)
{
for (unsigned i = 0; i < comment->num_comments; ++i)
flac_parse_comment(tag, char_tnum, &comment->comments[i]);
}
void
flac_tag_apply_metadata(struct tag *tag, const char *track,
const FLAC__StreamMetadata *block)
{
switch (block->type) {
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
flac_vorbis_comments_to_tag(tag, track,
&block->data.vorbis_comment);
break;
case FLAC__METADATA_TYPE_STREAMINFO:
tag->time = flac_duration(&block->data.stream_info);
break;
default:
break;
}
}
|
