feat(akroasis-core): DSP stages 5–7 — compressor, convolution, volume+dither#35
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forkwright merged 2 commits intomainfrom Mar 11, 2026
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feat(akroasis-core): DSP stages 5–7 — compressor, convolution, volume+dither#35forkwright merged 2 commits intomainfrom
forkwright merged 2 commits intomainfrom
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…+dither Stage 5 (compressor.rs): peak-mode dynamics compressor with exponential attack/release envelope smoothing, hard-knee gain reduction, and a brick-wall limiter ceiling. Disabled stage passes samples through unchanged. Stage 6 (convolution.rs): Phase 5 passthrough. Samples unmodified; signal path metadata reports enabled/disabled and HighQuality tier impact for when FFT convolution is wired up. Stage 7 (volume.rs): linear gain from level_db, logarithmic slider→gain mapping (40 dB range, slider 50 → −20 dB), and TPDF dither via SmallRng for i16/i24/i32 quantization. Public quantize_* free functions for output stage use. new_seeded constructor enables deterministic testing. 53 tests pass; cargo clippy -D warnings clean.
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Summary
dsp/compressor.rs): peak-mode dynamics compressor with exponential attack/release envelope smoothing (RC time constant), hard-knee gain reduction, and brick-wall limiter ceiling. Disabled stage is a zero-cost passthrough. Tier impact:Losslesswhen enabled.dsp/convolution.rs): Phase 5 passthrough. Signal path metadata wired up (enabled flag,HighQualitytier impact) ready for FFT convolution in Phase 5.dsp/volume.rs): linear gain fromlevel_db, logarithmic slider→gain mapping (40 dB range; slider 50 → −20 dB), TPDF dither via seededSmallRngfor i16/i24/i32 quantization. Publicquantize_*free functions for the output stage.new_seededconstructor enables deterministic tests.Test plan
cargo checkpassescargo test— 53 tests pass (18 new across the three stages)cargo clippy -- -D warningscleanDepends on: P1-01 (scaffold — merged in #33)
Blocks: P1-07 (gapless), P1-08 (engine)