Implement a complete binaural audio processing pipeline that sits before
EQ Studio in the signal chain. Supports multichannel (5.1) HRTF
binauralization for Dolby Atmos and Apple 3D Audio content, with
crossfeed and stereo widening for regular stereo content.
New modules:
- hrtf-generator.js: Procedural HRTF impulse response synthesis using
Woodworth head model (ITD, ILD, head shadow, pinna coloring)
- binaural-dsp.js: BinauralDSP engine with multichannel splitter,
per-channel ConvolverNode HRTF rendering, Bauer-style crossfeed
(low/medium/high), and M/S stereo widener
Integration:
- Audio graph: binaural block inserted before preamp/EQ, multichannel
passthrough via MediaElementSource channelCount=6
- Storage: binauralDspSettings with full persistence (JSON in localStorage)
- UI: toggle + sub-controls (crossfeed level, HRTF preset, width slider)
placed before EQ Studio in settings
- Player: auto-enables binaural DSP when Atmos content detected,
shows binaural badge on Atmos tracks
