PlaybackEngine

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

Integration status (#25): standalone experimental scaffolding. MovieMakerCore no longer constructs or links this stack; MF PlaybackController is the live application playback path. A future integration needs a catalog and UI tick.

At a glance

A compact Media Foundation playback engine in the DirectUI namespace: opens a media file, plays/pauses/stops/seeks, and pushes frames to a GPURenderer for presentation. The engine-layer counterpart of MovieMakerCore's HMRAVSource + Preview stack.

Public surface (header Playback.h)

namespace DirectUI {

class GPURenderer;

class __declspec(dllexport) PlaybackEngine {
public:
    explicit PlaybackEngine(GPURenderer* pRenderer);
    ~PlaybackEngine();

    HRESULT OpenFile(const std::wstring& path);
    HRESULT Play();
    HRESULT Pause();
    HRESULT Stop();
    HRESULT Seek(double seconds);
    HRESULT UpdateFrame();
    // ...
};

} // namespace DirectUI

Implementation notes

• Media Foundation based: includes mfapi.h, mfobjects.h, mfidl.h, mfreadwrite.h (source-reader style playback), plus d3d11.h for the texture handoff.
• Construction takes a GPURenderer* — frames decoded by MF are handed to the renderer's DrawVideoFrame path. UpdateFrame() pumps one frame (used for scrubbing/paused seek display).
• Being a static library it has no exports/ordinals; it appears in the CI matrix as PlaybackEngine.

Testing

Built in the CI matrix; exercised by engine-layer apps (e.g. apps/pipeline-graph).

Analysis artifacts

Engine-layer reconstruction; the original's in-engine playback analysis lives under analysis/MovieMakerCore/ and analysis/SharedMFDlls/.