tracktion_SmartThumbnail.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 SmartThumbnail   : public juce::AudioThumbnailBase,
                         private juce::Timer
{
public:
    //==============================================================================
    SmartThumbnail (Engine&, const AudioFile&, juce::Component& componentToRepaint, Edit*);
 
    SmartThumbnail (Engine&, const AudioFile&, juce::Component& componentToRepaint, Edit*,
                    std::unique_ptr<juce::AudioThumbnailBase> thumbnailToUse);
 
    ~SmartThumbnail() override;
 
    static void setEnabled (bool e)             { enabled = e; }
 
    static bool areThumbnailsFullyLoaded (Engine&);
 
    //==============================================================================
    void setNewFile (const AudioFile&);
 
    bool isGeneratingProxy() const noexcept     { return wasGeneratingProxy; }
 
    float getProxyProgress() const noexcept     { return lastProgress; }
 
    bool isOutOfDate() const noexcept           { return thumbnailIsInvalid; }
 
    //==============================================================================
    void drawChannel (juce::Graphics&, juce::Rectangle<int>,
                      TimeRange, int channelNum, float verticalZoomFactor);
 
    void drawChannels (juce::Graphics&, juce::Rectangle<int>,
                       TimeRange, float verticalZoomFactor);
 
    double getProportionComplete() const noexcept;
 
    //==============================================================================
    void clear() override;
    bool setSource (juce::InputSource*) override;
    void setReader (juce::AudioFormatReader*, juce::int64 hashCode) override;
    bool loadFrom (juce::InputStream&) override;
    void saveTo (juce::OutputStream&) const override;
    int getNumChannels() const noexcept override;
    double getTotalLength() const noexcept override;
    bool isFullyLoaded() const noexcept override;
    juce::int64 getNumSamplesFinished() const noexcept override;
    float getApproximatePeak() const override;
    void getApproximateMinMax (double startTime, double endTime, int channelIndex,
                               float& minValue, float& maxValue) const noexcept override;
    juce::int64 getHashCode() const override;
    void reset (int numChannels, double sampleRate, juce::int64 totalSamplesInSource) override;
    void addBlock (juce::int64 sampleNumberInSource, const juce::AudioBuffer<float>&,
                   int startOffsetInBuffer, int numSamples) override;
 
    //==============================================================================
    void audioFileChanged();
    void releaseFile();
 
    //==============================================================================
    AudioFile file;
    Engine& engine;
    Edit* const edit = nullptr;
 
private:
    //==============================================================================
    std::unique_ptr<juce::AudioThumbnailBase> thumbnail;
    juce::Component& component;
    bool wasGeneratingProxy = false;
    std::atomic<bool> thumbnailIsInvalid { true };
    float lastProgress = 0.0f;
 
    void timerCallback() override;
    void fileWasChanged();
    void createThumbnailReader();
 
    static bool enabled;
 
    void drawChannel (juce::Graphics&,
                      const juce::Rectangle<int>&,
                      double startTimeSeconds,
                      double endTimeSeconds,
                      int channelNum,
                      float verticalZoomFactor) override;
    void drawChannels (juce::Graphics&,
                       const juce::Rectangle<int>&,
                       double startTimeSeconds,
                       double endTimeSeconds,
                       float verticalZoomFactor) override;
 
    JUCE_DECLARE_WEAK_REFERENCEABLE(SmartThumbnail)
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SmartThumbnail)
};
 
}} // namespace tracktion { inline namespace engine