speech-enhancement-native

Native Rust inference engines for published speech-enhancement models, built as LADSPA and PipeWire plugins for BigLinux.

The models come from their authors: DeepFilterNet3 (Schröter et al.), DPDFNet (Ceva) and GTCRN-AEC (LocalVQE). This repository reimplements their inference path without ONNX Runtime, OpenVINO or PyTorch. Recurrent weights are int8 with int16 activations (W8A16), and the kernels are chosen at runtime for the CPU: scalar, SSE4.1, AVX or AVX2+FMA. The int8 matrix products accumulate exactly in integers, so their result does not depend on the tier.

Packages

Package	Plugin	File	Label / name
deepfilternet3-native	DeepFilterNet3 noise suppression (default)	/usr/lib/ladspa/libdfn3_ladspa.so	deep_filter_net3_rs_mono
	DeepFilterNet3-LL, larger model, no lookahead	/usr/lib/ladspa/libdfn3ll_ladspa.so	deep_filter_net3_ll_rs_mono
	Lookahead peak limiter	/usr/lib/ladspa/liblimiter_ladspa.so	biglinux_lookahead_limiter_mono
dpdfnet-native	DPDFNet-2 48 kHz HR noise suppression	/usr/lib/ladspa/libdpdfnet_native.so	dpdfnet_native_48hr
	The same model over whole files, on several threads (how)	/usr/bin/dpdfnet-enhance
gtcrn-aec-native	GTCRN-AEC echo cancellation	/usr/lib/spa-0.2/aec/libspa-aec-gtcrn.so	library.name = aec/libspa-aec-gtcrn

All plugins take 48 kHz mono and accept any host block size.

CPU cost

CPU seconds per minute of audio, one core, measured with perf stat (method):

Engine	i5-13400 (AVX2)	i3-2375M (AVX, 2011)
DeepFilterNet3	0.8	5.2
DeepFilterNet3-LL	2.1	15.2
DPDFNet-2 48 kHz HR	3.9	27.3
GTCRN-AEC (16 kHz core)	1.2	7.2

Build

Rust 1.98.1 or newer (rust-toolchain.toml).

cargo build --release --locked --workspace --exclude dpdfnet-native
cargo build --locked --profile release-unwind -p dpdfnet-native

export AEC_GTCRN_GGUF=$PWD/gtcrn-aec/model/localvqe-pi-aec-v1-49k-f32.gguf
export DPDFNET_TEST_MODEL=$PWD/dpdfnet/model/dpdfnet2_48khz_hr-w8a16
cargo test --release --locked --workspace --exclude dpdfnet-native
cargo test --locked --profile release-unwind -p dpdfnet-native
cargo test --locked --profile release-unwind -p dpdfnet-native --test runtime --test offline -- --ignored

pkgbuild/PKGBUILD builds the three packages the same way.

Layout

ops/              int8/SIMD kernels shared by DeepFilterNet3 and GTCRN-AEC
deepfilternet3/   DeepFilterNet3 and -LL engines, CLIs, benchmarks, weight quantizer
limiter-ladspa/   peak limiter
dpdfnet/          DPDFNet engine, its own kernel crate, model bundle, export tools
gtcrn-aec/        GTCRN-AEC engine, PipeWire SPA plugin, model, evaluation harness
pkgbuild/         Arch/BigLinux split package
docs/             design notes per engine and performance method

dpdfnet/ops started as a copy of ops and diverged. Merging them needs the bit-identity tests of both engines to pass on every SIMD tier.

Documentation

• DeepFilterNet3
• DPDFNet
• GTCRN-AEC
• Performance and numerical rules

License

Code: MIT OR Apache-2.0 (LICENSE-MIT, LICENSE-APACHE); the gtcrn-aec crates are Apache-2.0. Model weights keep their upstream licenses. Sources, checksums and changes are listed in NOTICE.