mirror of
https://github.com/juce-framework/JUCE.git
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119 lines
3.4 KiB
C++
119 lines
3.4 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-11 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online at www.gnu.org/licenses.
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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BEGIN_JUCE_NAMESPACE
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//==============================================================================
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struct ThumbnailCacheEntry
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{
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int64 hash;
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uint32 lastUsed;
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MemoryBlock data;
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JUCE_LEAK_DETECTOR (ThumbnailCacheEntry);
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};
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//==============================================================================
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AudioThumbnailCache::AudioThumbnailCache (const int maxNumThumbsToStore_)
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: TimeSliceThread ("thumb cache"),
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maxNumThumbsToStore (maxNumThumbsToStore_)
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{
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startThread (2);
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}
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AudioThumbnailCache::~AudioThumbnailCache()
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{
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}
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ThumbnailCacheEntry* AudioThumbnailCache::findThumbFor (const int64 hash) const
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{
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for (int i = thumbs.size(); --i >= 0;)
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if (thumbs.getUnchecked(i)->hash == hash)
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return thumbs.getUnchecked(i);
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return nullptr;
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}
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bool AudioThumbnailCache::loadThumb (AudioThumbnail& thumb, const int64 hashCode)
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{
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ThumbnailCacheEntry* te = findThumbFor (hashCode);
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if (te != nullptr)
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{
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te->lastUsed = Time::getMillisecondCounter();
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MemoryInputStream in (te->data, false);
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thumb.loadFrom (in);
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return true;
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}
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return false;
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}
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void AudioThumbnailCache::storeThumb (const AudioThumbnail& thumb,
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const int64 hashCode)
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{
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ThumbnailCacheEntry* te = findThumbFor (hashCode);
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if (te == nullptr)
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{
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te = new ThumbnailCacheEntry();
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te->hash = hashCode;
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if (thumbs.size() < maxNumThumbsToStore)
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{
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thumbs.add (te);
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}
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else
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{
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int oldest = 0;
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uint32 oldestTime = Time::getMillisecondCounter() + 1;
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for (int i = thumbs.size(); --i >= 0;)
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{
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if (thumbs.getUnchecked(i)->lastUsed < oldestTime)
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{
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oldest = i;
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oldestTime = thumbs.getUnchecked(i)->lastUsed;
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}
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}
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thumbs.set (oldest, te);
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}
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}
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te->lastUsed = Time::getMillisecondCounter();
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MemoryOutputStream out (te->data, false);
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thumb.saveTo (out);
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}
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void AudioThumbnailCache::clear()
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{
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thumbs.clear();
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}
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END_JUCE_NAMESPACE
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