MediaCatalog

Source	src/Media/
CMake target	MediaCatalog (static library)
Type	Static lib (linked into consumers)
Family	DirectUI engine layer

At a glance

A compact media-item registry in the DirectUI-adjacent engine layer: import files, track their metadata, and generate thumbnails. Consumed by the engine-layer applications (GPURenderer demo apps, pipeline-graph, etc.) rather than by MovieMakerCore itself — which has its own MediaBrowser + ThumbnailCache.

Public surface (header MediaCatalog.h)

struct MediaItem {
    std::wstring id;
    std::wstring path;
    double duration = 0.0;
    int width  = 0;
    int height = 0;
    HBITMAP thumbnail = nullptr;
};

class MediaCatalog {
public:
    std::vector<std::wstring> ImportFiles(const std::vector<std::wstring>& paths);
    const MediaItem* GetItem(const std::wstring& id) const;
    const std::unordered_map<std::wstring, MediaItem>& GetAll() const;
private:
    std::unordered_map<std::wstring, MediaItem> m_items;
    std::wstring GenerateId();
    HBITMAP CreateThumbnail(const std::wstring& path);
};

Implementation notes

• IDs are generated internally (GenerateId) — callers refer to items by ID.
• Thumbnails are HBITMAPs created via GDI+ (CreateThumbnail), keeping the dependency footprint to Windows APIs only.
• Being a static library, it has no exports or DLL entry points; it participates in the CI matrix as target MediaCatalog.

Testing

Built as part of the CI matrix (build-projects.yml); exercised by the engine-layer apps under apps/.

Analysis artifacts

This is reconstructed-first code (engine layer), so no 1:1 original binary; see analysis/MovieMakerCore/ for the equivalent in-engine surfaces.