Moves the WebAudio→engine bus — ring, producer-side linear resampler,
prefill gate, fill clamp, metrics — verbatim into
src/audio/engine/RendererBus.h. AudioEngine keeps thin facades
(setRendererBus/pushRendererAudio/pullRendererBus/getRendererBusMetrics) so
the NodeAddon surface is unchanged. JUCE-free: pull() takes raw channel
pointers, which is what lets tests/engine_units drive the resampler
continuity, prime/underflow/clamp, and metrics cases without a device.
The control-thread readIndex write on disable (deep-read §4) is preserved
verbatim and marked; its flush-flag fix lands as the phase-8 commit.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Moves the shared run-state atomics (currentSampleRate, block sizes,
duplexMode, run flags) into slopsmith::EngineState (src/audio/engine/) so
later extracted units take EngineState& and stay unit-testable without JUCE
devices. AudioEngine binds the members back by reference under their
historical names — zero call-site churn, behavior-identical.
The old audioRunning conflated user intent with device state (deep-read
§3/§6); it is now state.deviceRunning (same semantics, isAudioRunning compat
pinned) plus a new state.userWantsAudio written only by startAudio/stopAudio.
Nothing reads the intent flag yet — phase 8 flips setAudioDevices' restart
decision onto it.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Replaces the four hand-maintained copies of the packed-LR SPSC design
(split-mode output ring, per-InputDeviceSlot rings, stream-sink ring,
renderer-bus ring) with slopsmith::PackedStereoRing<NFrames>
(src/audio/engine/PackedStereoRing.h). The template owns the storage,
power-of-two/lock-free asserts, pack/unpack, producer publish, reset, the
w<r resync, and the lapped catch-up; per-site consumer policy (pull-vs-
consume skew, renderer prime/fill-clamp) stays verbatim at the call sites.
Pure code move per the TLC plan — no behavior change; the renderer bus's
control-thread readIndex write on disable (deep-read §4) is deliberately
preserved and gets its flush-flag fix in phase 2.
Unit-tested in tests/engine_units/packed_stereo_ring_test.cpp: threaded
tear-freedom under lapping (2M frames), drop-oldest catch-up, index-reset
resync, pull-vs-consume skew.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
NaN/Inf from any JS caller (audio:setGain does no validation) previously
reached the gain atomics raw; a NaN master gain multiplies the whole device
output to NaN and poisons the peak meters (TLC deep-read §2). Clamp at the
four setters — the single choke point covering the legacy facade, the
source-indexed API, and the audio-effects executor.
Bounds 0..32 match the executor's clampGain (Phase 0.b compat pin); stream/
renderer-bus keep their historical 0..8 via the same JUCE-free helper, now
testable in the new tests/engine_units target (Phase 0.c harness).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
