199 lines
5.0 KiB
C++
199 lines
5.0 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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class AudioThumbnailCache::ThumbnailCacheEntry
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{
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public:
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ThumbnailCacheEntry (const int64 hashCode)
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: hash (hashCode),
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lastUsed (Time::getMillisecondCounter())
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{
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}
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ThumbnailCacheEntry (InputStream& in)
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: hash (in.readInt64()),
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lastUsed (0)
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{
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const int64 len = in.readInt64();
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in.readIntoMemoryBlock (data, (ssize_t) len);
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}
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void write (OutputStream& out)
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{
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out.writeInt64 (hash);
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out.writeInt64 ((int64) data.getSize());
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out << data;
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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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private:
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JUCE_LEAK_DETECTOR (ThumbnailCacheEntry)
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};
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//==============================================================================
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AudioThumbnailCache::AudioThumbnailCache (const int maxNumThumbs)
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: thread ("thumb cache"),
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maxNumThumbsToStore (maxNumThumbs)
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{
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jassert (maxNumThumbsToStore > 0);
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thread.startThread (2);
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}
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AudioThumbnailCache::~AudioThumbnailCache()
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{
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}
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AudioThumbnailCache::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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int AudioThumbnailCache::findOldestThumb() const
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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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const ThumbnailCacheEntry* const te = thumbs.getUnchecked(i);
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if (te->lastUsed < oldestTime)
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{
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oldest = i;
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oldestTime = te->lastUsed;
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}
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}
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return oldest;
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}
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bool AudioThumbnailCache::loadThumb (AudioThumbnailBase& thumb, const int64 hashCode)
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{
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const ScopedLock sl (lock);
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if (ThumbnailCacheEntry* te = findThumbFor (hashCode))
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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 loadNewThumb (thumb, hashCode);
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}
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void AudioThumbnailCache::storeThumb (const AudioThumbnailBase& thumb,
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const int64 hashCode)
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{
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const ScopedLock sl (lock);
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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 (hashCode);
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if (thumbs.size() < maxNumThumbsToStore)
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thumbs.add (te);
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else
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thumbs.set (findOldestThumb(), te);
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}
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{
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MemoryOutputStream out (te->data, false);
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thumb.saveTo (out);
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}
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saveNewlyFinishedThumbnail (thumb, hashCode);
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}
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void AudioThumbnailCache::clear()
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{
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const ScopedLock sl (lock);
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thumbs.clear();
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}
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void AudioThumbnailCache::removeThumb (const int64 hashCode)
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{
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const ScopedLock sl (lock);
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for (int i = thumbs.size(); --i >= 0;)
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if (thumbs.getUnchecked(i)->hash == hashCode)
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thumbs.remove (i);
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}
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static inline int getThumbnailCacheFileMagicHeader() noexcept
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{
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return (int) ByteOrder::littleEndianInt ("ThmC");
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}
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bool AudioThumbnailCache::readFromStream (InputStream& source)
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{
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if (source.readInt() != getThumbnailCacheFileMagicHeader())
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return false;
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const ScopedLock sl (lock);
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clear();
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int numThumbnails = jmin (maxNumThumbsToStore, source.readInt());
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while (--numThumbnails >= 0 && ! source.isExhausted())
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thumbs.add (new ThumbnailCacheEntry (source));
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return true;
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}
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void AudioThumbnailCache::writeToStream (OutputStream& out)
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{
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const ScopedLock sl (lock);
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out.writeInt (getThumbnailCacheFileMagicHeader());
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out.writeInt (thumbs.size());
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for (int i = 0; i < thumbs.size(); ++i)
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thumbs.getUnchecked(i)->write (out);
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}
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void AudioThumbnailCache::saveNewlyFinishedThumbnail (const AudioThumbnailBase&, int64)
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{
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}
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bool AudioThumbnailCache::loadNewThumb (AudioThumbnailBase&, int64)
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{
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return false;
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}
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} // namespace juce
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