tracktion_RecordingThumbnailManager.h

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 /*
    ,--.                     ,--.     ,--.  ,--.
  ,-'  '-.,--.--.,--,--.,---.|  |,-.,-'  '-.`--' ,---. ,--,--,      Copyright 2024
  '-.  .-'|  .--' ,-.  | .--'|     /'-.  .-',--.| .-. ||      \   Tracktion Software
    |  |  |  |  \ '-'  \ `--.|  \  \  |  |  |  |' '-' '|  ||  |       Corporation
    `---' `--'   `--`--'`---'`--'`--' `---' `--' `---' `--''--'    www.tracktion.com
 
    Tracktion Engine uses a GPL/commercial licence - see LICENCE.md for details.
*/
 
namespace tracktion { inline namespace engine
{
 
class RecordingThumbnailManager
{
public:
    RecordingThumbnailManager (Engine& e) : engine (e) {}
 
    struct Thumbnail  : public juce::ReferenceCountedObject
    {
        using Ptr = juce::ReferenceCountedObjectPtr<Thumbnail>;
 
        Engine& engine;             
        const std::unique_ptr<juce::AudioThumbnailBase> thumb;  
        juce::File file;            
        const HashCode hash;        
        TimePosition punchInTime;   
        ~Thumbnail()
        {
            TRACKTION_ASSERT_MESSAGE_THREAD
            engine.getRecordingThumbnailManager().thumbs.removeAllInstancesOf (this);
        }
 
        void reset (int numChannels, double sampleRate)
        {
            thumb->reset (numChannels, sampleRate, 0);
            nextSampleNum = 0;
        }
 
        void addBlock (const juce::AudioBuffer<float>& incoming, int startOffsetInBuffer, int numSamples)
        {
            thumb->addBlock (nextSampleNum, incoming, startOffsetInBuffer, numSamples);
            nextSampleNum += numSamples;
        }
 
    private:
        friend class RecordingThumbnailManager;
        std::atomic<int64_t> nextSampleNum { 0 };
 
        Thumbnail (Engine& e, const juce::File& f)
            : engine (e),
              thumb (engine.getUIBehaviour().createAudioThumbnail (1024, engine.getAudioFileFormatManager().readFormatManager,
                                                                   engine.getAudioFileManager().getAudioThumbnailCache())),
              file (f), hash (f.hashCode64())
        {
            TRACKTION_ASSERT_MESSAGE_THREAD
            engine.getRecordingThumbnailManager().thumbs.addIfNotAlreadyThere (this);
        }
 
        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Thumbnail)
    };
 
    //==============================================================================
    Thumbnail::Ptr getThumbnailFor (const juce::File& f)
    {
        TRACKTION_ASSERT_MESSAGE_THREAD
 
        for (auto t : thumbs)
            if (t->file == f)
                return *t;
 
        return *new Thumbnail (engine, f);
    }
 
private:
    Engine& engine;
    juce::Array<Thumbnail*> thumbs;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (RecordingThumbnailManager)
};
 
}} // namespace tracktion { inline namespace engine