Native FunASR workers

This directory builds two thin JSON-lines process wrappers around the official FunASR C++ ONNX runtime:

• vocotype-streaming-worker owns the online Paraformer state used for

two-pass live preview.

• vocotype-offline-worker owns final Contextual Paraformer inference,

contextual hotword embeddings, optional VAD, punctuation, and resampling.

VoCoType does not reimplement Paraformer's frontend, CIF, decoder, overlap, FSMN cache, VAD, or punctuation algorithms. Both workers call the pinned upstream runtime directly.

The build is pinned to FunASR commit bd6e72142f1cca3c30b7651bf5fa567dfe969810 and CPU-only ONNX Runtime 1.23.2. The SDK checksum is verified before use.

./src/workers/funasr/build.sh

For offline development builds, set FUNASR_SOURCE_DIR and ONNXRUNTIME_DIR to existing source and SDK directories. The relocatable result is written to:

src/workers/funasr/build/bundle/
├── bin/
│   ├── vocotype-streaming-worker
│   └── vocotype-offline-worker
└── lib/

Release CI builds the workers once on Ubuntu 22.04, audits every ELF dependency and RUNPATH, and injects the same bundle into DEB, RPM, and Arch packages. End users never compile FunASR locally.

Both workers exit after configurable idle periods. Model memory is therefore reclaimed by normal process exit without destabilizing the long-lived input method process.

Toolchain compatibility

The pinned upstream runtime vendors older Kaldi/OpenFST and yaml-cpp snapshots. funasr-toolchain-compat.patch is applied only to a disposable build copy to add a missing <cstdint> include and fix ownership/copy errors rejected by modern compilers. Inference behavior is not changed.