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Export (app/export/)

Audio export functionality — stems, master bounce, and sheet music.

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Files

FilePurpose
ExportManager.cppAll export methods: exportStems(), exportMaster(), exportSheetMusic(). These are SongbirdEditor member functions defined in a separate file for organization.

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Export Operations

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Stems (exportStems)

Renders each track individually as a WAV file. Uses Tracktion’s offline render with track solo/mute automation:
  1. Creates a background RenderJob thread
  2. Iterates tracks, solos one at a time with return FX optionally included
  3. Renders to exports/<projectName>_stems/ with progress updates to the WebView

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Master (exportMaster)

Bounces the full mix to a single stereo WAV:
  1. Creates a MasterRenderJob thread
  2. Renders all tracks through the master bus
  3. Outputs to exports/<projectName>_master.wav

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Sheet Music (exportSheetMusic)

Converts the current .bird file parse result to sheet music JSON and sends it to the React UI for rendering via the SheetMusicView panel.

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Design Principles

  • Background threads — All audio renders run on dedicated juce::Thread instances to avoid blocking the message thread. Progress is pushed to React via callAsync + emitEventIfBrowserIsVisible.
  • Tracktion render API — Uses tracktion::Renderer for bit-perfect offline bouncing at the project’s sample rate.
  • Track state preservation — Solo/mute state is saved and restored after stem export to avoid side effects.