Barometer reference plugin
Transparent gain, loudness, true-peak, and LRA metering built from source.
BS.1770 / EBU R128 C++ audio source
Bellweather Audio Core
Open-source C++ audio-core library: BS.1770 / EBU Tech 3341 conformance suite, RT-safety primitives, and Barometer as a source-built JUCE reference plugin.
BS.1770 / EBU R128loudness, true-peak, and LRA conformance tests
Apache-2.0Bellweather source published under a permissive license
JUCE-free library buildreusable targets stay framework-neutral when Barometer is off
Reference sourceBarometer included without prebuilt binaries or installers
JUCE at the edge. Reusable audio below it.
The reusable libraries stay framework-neutral. Barometer shows how they adapt into JUCE without making JUCE the center of the architecture.
JUCE adapter layer
Host plumbing stays at the edge instead of becoming the reusable core.
Metering and DSP core
BS.1770, true-peak, LRA, ballistics, and framework-neutral primitives.
Audio and state types
Small value types for process, parameter, transport, and state data.
RT-safe infrastructure
Audio-thread utilities, guards, and lock-free support below the UI layer.
Use the libraries. Inspect the reference build.
Bellweather Audio Core is intentionally narrow: stable reusable API, Barometer reference plugin source, and only the support code required to build that reference locally.
With BWS_BUILD_BAROMETER_PLUGIN=OFF, the public tree exposes 9 standalone library-mode targets that do not link JUCE.
Enabling Barometer adds the JUCE adapter, UI, preset, example, and shipped UI support targets required for the plugin source build. They support the reference build; they are not an end-user plugin distribution.
Reusable library targets
bws::bw_dsp_metering
Loudness and true-peak meters
LUFS, LRA, true-peak, and meter ballistics with conformance tests.
bws::bw_dsp_core
Framework-neutral primitives
DSP constants, one-pole filters, thread mapping, and shared concepts.
bws::bw_rt
Real-time utilities
Audio-thread guards, violation buffers, lock-free structures, and denormal care.
bws::bw_audio_types
Audio value types
Buffers, process contexts, parameter snapshots, and transport state.
bws::bw_ports
Framework-agnostic ports
Framework-agnostic plugin, parameter, scheduling, state, and preset interfaces.
bws::bw_fft_adapters
FFT wrapper
A Bellweather surface over platform Accelerate or bundled pffft.
Public proof
Public surface
Small downstream smoke targets link each documented module alias.
ctest \ --test-dir build-library \ -L public-surface \ --output-on-failure
Metering conformance
BS.1770, EBU Tech 3341/3342, true-peak, LRA, and sample-rate checks.
ctest \ --test-dir build-library \ -R bw_dsp_metering \ --output-on-failure
Framework separation
Reusable core modules stay below the JUCE adapter and plugin layer.
ctest \ --test-dir build-library \ -L framework-boundary \ --output-on-failure
Docker lanes
Linux clean-room lanes cover Clang, GCC, system Catch2, and optional Barometer.
tools/docker_lanes.sh
Source-built JUCE reference plugin
Barometer shows the source in use.
Barometer exercises the public library surface inside a real JUCE plugin without turning this release into a prebuilt plugin download.
Included: Barometer reference plugin source.
Included: JUCE adapter, UI, preset, and example support.
Not included: prebuilt binaries, installers, signing, notarization, product services.
Library/framework source release
Clone the source. Run the proofs.
Public-surface compile/link checks, JUCE-separation validation, manifest coverage, and standards-oriented metering tests ship with the source.
Built by Bellweather Studios.
git clone https://github.com/keithhetrick/bellweather-audio-core.git cd bellweather-audio-core cmake --preset library cmake --build --preset library ctest --test-dir build-library --output-on-failure
Bellweather Audio Core is the public source surface. GitHub is the code surface.