79e4baedd0
Closes the last gap before Phase 5's monitor TUI: per-app meter events already publish on the meters topic via the registry watcher; bus-level DSP meters now also publish. 4g — Bus meters headroom_core::meters::BusMetrics is an Arc<parking_lot::Mutex<...>> snapshot owned by the playback callback (try_lock; skip on contention) and read by the AGC controller on each 50 ms tick. Carries: compressor GR, limiter total/soft/hard GR, true peak. The AGC controller combines these with its ebur128 readings (momentary, short-term, integrated) and the current smoothed AGC target, then publishes a headroom_ipc::MeterTick on Topic::Meters. Publish cadence honours profile.meters.publish_hz, capped at the AGC tick rate (20 Hz). Lower publish_hz throttles to every Nth tick. Mode::I added to the AGC's EbuR128 so loudness_global() is available without a second ebur128 instance. Bounded cost — a histogram walk per call, <=20 Hz. LUFS values are sanitised to a -200.0 dB floor via finite_or_floor() — ebur128 returns -inf (not Err) for "no usable measurement yet," and non-finite f32 can't survive JSON serialisation (serde_json renders as null). Housekeeping shipped alongside headroom-client moved from [dependencies] to [dev-dependencies] in headroom-core — it's only used inside ipc::server's tests. Verified by full clippy + test run; production builds no longer pull it in. Pre-existing clippy nits cleared (limiter.rs x5, app_level.rs, ipc/ops.rs, pw/filter.rs). All field_reassign_with_default or assign_op_pattern in test code; stage-6 commit ran clippy without --all-targets so these slipped through. Verified 178 tests passing (28 dsp + 48 dsp + 20 ipc + 106 core including +2 new meters tests + 4 client). Clippy clean at default level with -D warnings --all-targets. Smoke test: monitor meters subscription receives 20 Hz MeterTick events with the expected JSON shape (all fields finite). |
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| README.md | ||
headroom-dsp
DSP kernels for Headroom. Pure Rust, no dependencies.
Limiter— feed-forward true-peak brickwall with configurable oversampling (1/2/4/8×), lookahead, hold, and release.Compressor— log-domain feed-forward with peak or RMS detector, soft knee, attack/release, and optional auto-makeup.AttackRelease— exponential envelope follower (peak / inverse-gain modes).DelayLine,SlidingMaxBuffer,PolyphaseUpsampler,PolyphaseDownsampler— supporting building blocks.
All processors are allocation-free in their process_* methods.
Construction allocates; do not construct in the audio thread.
License
MPL-2.0.