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
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
==============================================================================
This file is part of the JUCE framework.
Copyright (c) Raw Material Software Limited
JUCE is an open source framework subject to commercial or open source
licensing.
By downloading, installing, or using the JUCE framework, or combining the
JUCE framework with any other source code, object code, content or any other
copyrightable work, you agree to the terms of the JUCE End User Licence
Agreement, and all incorporated terms including the JUCE Privacy Policy and
the JUCE Website Terms of Service, as applicable, which will bind you. If you
do not agree to the terms of these agreements, we will not license the JUCE
framework to you, and you must discontinue the installation or download
process and cease use of the JUCE framework.
JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
JUCE Privacy Policy: https://juce.com/juce-privacy-policy
JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
Or:
You may also use this code under the terms of the AGPLv3:
https://www.gnu.org/licenses/agpl-3.0.en.html
THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
==============================================================================
*/
namespace juce
{
class AudioThumbnailCache::ThumbnailCacheEntry
{
public:
ThumbnailCacheEntry (const int64 hashCode)
: hash (hashCode),
lastUsed (Time::getMillisecondCounter())
{
}
ThumbnailCacheEntry (InputStream& in)
: hash (in.readInt64()),
lastUsed (0)
{
const int64 len = in.readInt64();
in.readIntoMemoryBlock (data, (ssize_t) len);
}
void write (OutputStream& out)
{
out.writeInt64 (hash);
out.writeInt64 ((int64) data.getSize());
out << data;
}
int64 hash;
uint32 lastUsed;
MemoryBlock data;
private:
JUCE_LEAK_DETECTOR (ThumbnailCacheEntry)
};
//==============================================================================
AudioThumbnailCache::AudioThumbnailCache (const int maxNumThumbs)
: thread (SystemStats::getJUCEVersion() + ": thumb cache"),
maxNumThumbsToStore (maxNumThumbs)
{
jassert (maxNumThumbsToStore > 0);
thread.startThread (Thread::Priority::low);
}
AudioThumbnailCache::~AudioThumbnailCache()
{
}
AudioThumbnailCache::ThumbnailCacheEntry* AudioThumbnailCache::findThumbFor (const int64 hash) const
{
for (int i = thumbs.size(); --i >= 0;)
if (thumbs.getUnchecked (i)->hash == hash)
return thumbs.getUnchecked (i);
return nullptr;
}
int AudioThumbnailCache::findOldestThumb() const
{
int oldest = 0;
uint32 oldestTime = Time::getMillisecondCounter() + 1;
for (int i = thumbs.size(); --i >= 0;)
{
const ThumbnailCacheEntry* const te = thumbs.getUnchecked (i);
if (te->lastUsed < oldestTime)
{
oldest = i;
oldestTime = te->lastUsed;
}
}
return oldest;
}
bool AudioThumbnailCache::loadThumb (AudioThumbnailBase& thumb, const int64 hashCode)
{
const ScopedLock sl (lock);
if (ThumbnailCacheEntry* te = findThumbFor (hashCode))
{
te->lastUsed = Time::getMillisecondCounter();
MemoryInputStream in (te->data, false);
thumb.loadFrom (in);
return true;
}
return loadNewThumb (thumb, hashCode);
}
void AudioThumbnailCache::storeThumb (const AudioThumbnailBase& thumb,
const int64 hashCode)
{
const ScopedLock sl (lock);
ThumbnailCacheEntry* te = findThumbFor (hashCode);
if (te == nullptr)
{
te = new ThumbnailCacheEntry (hashCode);
if (thumbs.size() < maxNumThumbsToStore)
thumbs.add (te);
else
thumbs.set (findOldestThumb(), te);
}
{
MemoryOutputStream out (te->data, false);
thumb.saveTo (out);
}
saveNewlyFinishedThumbnail (thumb, hashCode);
}
void AudioThumbnailCache::clear()
{
const ScopedLock sl (lock);
thumbs.clear();
}
void AudioThumbnailCache::removeThumb (const int64 hashCode)
{
const ScopedLock sl (lock);
for (int i = thumbs.size(); --i >= 0;)
if (thumbs.getUnchecked (i)->hash == hashCode)
thumbs.remove (i);
}
static int getThumbnailCacheFileMagicHeader() noexcept
{
return (int) ByteOrder::littleEndianInt ("ThmC");
}
bool AudioThumbnailCache::readFromStream (InputStream& source)
{
if (source.readInt() != getThumbnailCacheFileMagicHeader())
return false;
const ScopedLock sl (lock);
clear();
int numThumbnails = jmin (maxNumThumbsToStore, source.readInt());
while (--numThumbnails >= 0 && ! source.isExhausted())
thumbs.add (new ThumbnailCacheEntry (source));
return true;
}
void AudioThumbnailCache::writeToStream (OutputStream& out)
{
const ScopedLock sl (lock);
out.writeInt (getThumbnailCacheFileMagicHeader());
out.writeInt (thumbs.size());
for (int i = 0; i < thumbs.size(); ++i)
thumbs.getUnchecked (i)->write (out);
}
void AudioThumbnailCache::saveNewlyFinishedThumbnail (const AudioThumbnailBase&, int64)
{
}
bool AudioThumbnailCache::loadNewThumb (AudioThumbnailBase&, int64)
{
return false;
}
} // namespace juce
|
