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
|
/*
* Copyright (C) 2003-2014 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 "DatabaseHelpers.hxx"
#include "DatabasePlugin.hxx"
#include "Song.hxx"
#include "tag/Tag.hxx"
#include <functional>
#include <set>
#include <string.h>
struct StringLess {
gcc_pure
bool operator()(const char *a, const char *b) const {
return strcmp(a, b) < 0;
}
};
typedef std::set<const char *, StringLess> StringSet;
static bool
CollectTags(StringSet &set, TagType tag_type, Song &song)
{
const Tag *tag = &song.tag;
bool found = false;
for (unsigned i = 0; i < tag->num_items; ++i) {
if (tag->items[i]->type == tag_type) {
set.insert(tag->items[i]->value);
found = true;
}
}
if (!found)
set.insert("");
return true;
}
bool
VisitUniqueTags(const Database &db, const DatabaseSelection &selection,
TagType tag_type,
VisitString visit_string,
Error &error)
{
StringSet set;
using namespace std::placeholders;
const auto f = std::bind(CollectTags, std::ref(set), tag_type, _1);
if (!db.Visit(selection, f, error))
return false;
for (auto value : set)
if (!visit_string(value, error))
return false;
return true;
}
static void
StatsVisitTag(DatabaseStats &stats, StringSet &artists, StringSet &albums,
const Tag &tag)
{
if (tag.time > 0)
stats.total_duration += tag.time;
for (unsigned i = 0; i < tag.num_items; ++i) {
const TagItem &item = *tag.items[i];
switch (item.type) {
case TAG_ARTIST:
artists.insert(item.value);
break;
case TAG_ALBUM:
albums.insert(item.value);
break;
default:
break;
}
}
}
static bool
StatsVisitSong(DatabaseStats &stats, StringSet &artists, StringSet &albums,
Song &song)
{
++stats.song_count;
StatsVisitTag(stats, artists, albums, song.tag);
return true;
}
bool
GetStats(const Database &db, const DatabaseSelection &selection,
DatabaseStats &stats, Error &error)
{
stats.Clear();
StringSet artists, albums;
using namespace std::placeholders;
const auto f = std::bind(StatsVisitSong,
std::ref(stats), std::ref(artists),
std::ref(albums), _1);
if (!db.Visit(selection, f, error))
return false;
stats.artist_count = artists.size();
stats.album_count = albums.size();
return true;
}
|
