919 B
Lumi whisper.cpp worker
This is the dedicated native inference process used by WhisperWorkerSupervisor. It reads the existing length-prefixed metadata/PCM protocol from standard input and emits newline-delimited structured events on standard output. Audio remains in bounded memory and is never written to disk.
The build pins whisper.cpp to the commit recorded in runtime_manifest.json and nlohmann/json to v3.12.0. CPU is the portable verification target; the Lumi server release uses the CUDA option:
cmake -S . -B build -G Ninja -DLUMI_WHISPER_CUDA=ON -DCMAKE_BUILD_TYPE=Release
cmake --build build
The worker keeps at most six seconds per source, attempts an incremental decode around every 600 ms during speech, and finalizes after roughly 750 ms of measured silence. The server-side stabilizer remains authoritative for stable-prefix reconciliation and obsolete-revision suppression.