HMRAVSource

Location: src/MovieMakerCore/HMRAVSource/

HMRAVSource is the audio/video pipeline built on Media Foundation (with a DirectShow compatibility path), recovered from RTTI classes such as AVSource, MFSource, DShowSource, EncodeProfile, StreamSink, TranscodeManager, VideoCapture.

Tree (selected)

HMRAVSource/
  HMRAVSource.cpp/.h                 # pipeline facade
  AVSource / AVSourceFactory / AVSourceProxy / AVSink
  MFSource.cpp/.h                    # Media Foundation source creation
  MFSourceReaderBuilder / NativeMFSourceReaderBuilder /
  DShowMFSourceReaderBuilder / AsyncSourceResolver    # reader strategies
  MFByteStreamOnStream               # IMFByteStream over an IStream
  StreamSink.cpp/.h                  # sample processing sink
  StreamSinkHost / StreamSinkHelper
  TextureInterop.cpp/.h              # DX11 texture sharing with MF
  VideoProc.cpp/.h                   # DXVA2 / XVideoProc conversion
  TranscodeManager.cpp               # transcoding pipeline
  TranscodeMetadata / EncodeProfile / SAXProfileBuilder  # profile/metadata
  SyncVideoSource / CachedWFSection / ImageThumbnail
  VideoCapture / AudioCapture / AVCaptureSession        # capture support
  AuthProvider.cpp/.h                # in-memory credential cache (never persisted)
  dxva2stubs.cpp                     # DXVA2 compatibility stubs
  Audio/                             # audio DSP: fade, ducking, channel mapping,
                                     #   AudioOutput, AudioQueue, Mixer, Waveform

Source resolution strategy

Media resolution is strategy-based — a chain of reader builders:

AsyncSourceResolver performs the resolution off the UI thread.

Rendering integration

• TextureInterop moves decoded frames from MF surfaces into D3D11 textures shared with HMREngine (and the preview presenter), handling format conversion through VideoProc (DXVA2 video processor where available, via dxva2stubs.cpp compatibility shims).
• TranscodeManager drives export encodes using EncodeProfile (built from service-specific profiles by SAXProfileBuilder), coordinating with WLXTranscode.exe / WLXCodecHost.exe for out-of-process work.

Audio subsystem (Audio/)

Component	Role
AudioFadeProcessor	fade-in/fade-out envelope application
AudioDuckingProcessor	background-music ducking under narration (classic Movie Maker feature)
AudioChannelMapper	channel remapping (stereo↔mono, 5.1 downmix)
AudioOutput / AudioQueue	device output and buffering
Mixer	multi-track mixing
Waveform	waveform extraction for timeline display

Credentials

AuthProvider caches auth tokens in memory only (cleared on shutdown); the persistent store is the DPAPI-encrypted PSAAuthenticationStore (see Security). This split is deliberate: the original kept tokens alive for the session, and the reconstruction refuses to persist them in plaintext.

Known limitations (documented stubs)

• The full export rendering pipeline writes verified test frames, not real video — the highest-priority remaining reconstruction work (see the TODO audit and Stub Design).
• Source-image thumbnails and per-transition rendering details are partial.