aboutsummaryrefslogtreecommitdiffstats
path: root/src/tag.h
blob: 52e66bb77ba90a1e548cfe1a4918e10c2ab9682b (plain) (blame)
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
/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef MPD_TAG_H
#define MPD_TAG_H

#include "gcc.h"

#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <string.h>

enum tag_type {
	TAG_ITEM_ARTIST,
	TAG_ITEM_ALBUM,
	TAG_ITEM_ALBUM_ARTIST,
	TAG_ITEM_TITLE,
	TAG_ITEM_TRACK,
	TAG_ITEM_NAME,
	TAG_ITEM_GENRE,
	TAG_ITEM_DATE,
	TAG_ITEM_COMPOSER,
	TAG_ITEM_PERFORMER,
	TAG_ITEM_COMMENT,
	TAG_ITEM_DISC,

	TAG_MUSICBRAINZ_ARTISTID,
	TAG_MUSICBRAINZ_ALBUMID,
	TAG_MUSICBRAINZ_ALBUMARTISTID,
	TAG_MUSICBRAINZ_TRACKID,

	TAG_NUM_OF_ITEM_TYPES
};

extern const char *mpdTagItemKeys[];

struct tag_item {
	enum tag_type type;
	char value[sizeof(long)];
} mpd_packed;

struct tag {
	int time;
	struct tag_item **items;
	uint8_t numOfItems;
};

struct tag *tag_ape_load(const char *file);

struct tag *tag_new(void);

void tag_lib_init(void);

void tag_clear_items_by_type(struct tag *tag, enum tag_type itemType);

void tag_free(struct tag *tag);

/**
 * Gives an optional hint to the tag library that we will now add
 * several tag items; this is used by the library to optimize memory
 * allocation.  Only one tag may be in this state, and this tag must
 * not have any items yet.  You must call tag_end_add() when you are
 * done.
 */
void tag_begin_add(struct tag *tag);

/**
 * Finishes the operation started with tag_begin_add().
 */
void tag_end_add(struct tag *tag);

void tag_add_item_n(struct tag *tag, enum tag_type itemType,
		    const char *value, size_t len);

static inline void tag_add_item(struct tag *tag, enum tag_type itemType,
				const char *value)
{
	tag_add_item_n(tag, itemType, value, strlen(value));
}

struct tag *tag_dup(const struct tag *tag);

/**
 * Merges the data from two tags.  If both tags share data for the
 * same tag_type, only data from "add" is used.
 *
 * @return a newly allocated tag, which must be freed with tag_free()
 */
struct tag *
tag_merge(const struct tag *base, const struct tag *add);

/**
 * Returns true if the tag contains no items.  This ignores the "time"
 * attribute.
 */
static inline bool
tag_is_empty(const struct tag *tag)
{
	return tag->numOfItems == 0;
}

/**
 * Returns true if the tag contains any information.
 */
static inline bool
tag_is_defined(const struct tag *tag)
{
	return !tag_is_empty(tag) || tag->time >= 0;
}

/**
 * Returns the first value of the specified tag type, or NULL if none
 * is present in this tag object.
 */
const char *
tag_get_value(const struct tag *tag, enum tag_type type);

/**
 * Checks whether the tag contains one or more items with
 * the specified type.
 */
bool tag_has_type(const struct tag *tag, enum tag_type type);

bool tag_equal(const struct tag *tag1, const struct tag *tag2);

#endif