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FX engine overhaul (4.7.0) - #38
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…alog) Vendors baconpaul/airwin2rack (MIT) at commit a1eb817579e86215f76aa22dfcccecd49b103368 into a new CAirwindows SwiftPM C++ target: AirwinRegistry, the VST-era AirwinConsolidatedBase, and the ~528 generated effects under autogen_airwin/. The CMakeRC docs resource is replaced with a generated C++ translation unit (Scripts/generate_airwin_docs.py embeds awpdoc/*.txt as base64, decoded on lookup) so no app-bundle resource is needed for documentation. A small C shim (include/aw_shim.h, shim.cpp) exposes effect enumeration, parameter name/display/get/set, and planar-stereo block processing, so Swift never sees C++. AirwindowsNode (FXHostedNode) loads one effect by registry name, builds FXParamSpec from its own 0...1 parameters, applies pending parameter changes on the IO thread by generation, and always renders into preallocated scratch buffers (not every one of 528 effects is verified safe for in-place aliased processing). Airwindows exposes no native reset, so AirwindowsNode.reset() is a documented no-op rather than an IO-thread allocation. AirwindowsCatalog lists the registry for the effect browser, and is empty when the new AirwindowsLibrary.isEnabled (UserDefaults, default true) setting is off. Resources/Airwindows-LICENSE.txt is added with Makefile bundle and release.yml 'Create .app bundle' copy steps, matching the existing RNNoise/FastEnhancer pattern. Refs #13
AUCatalog scans AVAudioUnitComponentManager for aufx/aumf components that can run stereo or mono at 48 kHz. AUHostNode loads v2 components in-process (user accepted that risk) and v3 out of process; captures renderBlock and scheduleParameterBlock at load; process() is allocation/lock/ObjC-free, pulling input through a preallocated AudioBufferList and adapting channel count by summing/duplicating. Render errors pass the block through untouched and are counted atomically for a future UI badge. Specs are built from the flattened parameter tree (hostAddress = AUParameterAddress); a parameter-tree observer feeds the plugin's own UI changes back into params without an echo loop (lastKnown bit-pattern comparison). captureState()/restore round-trip fullState as a binary plist. makeEditor() uses requestViewController. PluginEditorWindowController presents any FXHostedNode's editor in one utility NSWindow per node (keyed by ObjectIdentifier), posting .fxPluginEditorClosed on close so the engine can capture state while still loaded. Adds Loopbacker.entitlements (disable-library-validation for in-process AUv2, device.audio-input for mic capture, allow-jit for JSFX's EEL2 JIT) and wires it into the Makefile bundle codesign and both release.yml app codesign steps. Tests against Apple's built-in AUDelay/AUNBandEQ/AUPeakLimiter/ AUDynamicsProcessor: catalog discovery, spec/parameter-tree extraction, delay shifts an impulse, limiter caps a +24 dB sine, parameter writes reach the audio, state round-trips a changed parameter, nonzero limiter latency, mono channel adaptation, and varying block sizes 1..4096 from a background thread. Discovered along the way: AUAudioUnit input busses must be explicitly enabled (isEnabled = true) before allocateRenderResources(), or renderBlock fails with kAudioUnitErr_NoConnection — nothing in AUHostNode's contract mentioned this, but every built-in AU needed it. Refs #11
… editor Vendors JoepVanlier/ysfx (Apache-2.0) + Cockos WDL's EEL2/LICE/SWELL (zlib-style) as a new SwiftPM C/C++ target, CYSFX, pinned at commit 5c3452fee62583aa3d1b7e877d0c758c4024af89. Patches EEL2's JIT allocator for Apple Silicon's MAP_JIT + pthread_jit_write_protect_np (the hardened runtime's com.apple.security.cs.allow-jit), and serializes ysfx_compile/ysfx_init behind a process-wide lock after finding upstream's optimizeOpcodes caches a function lookup in a thread-unsafe static. Full rationale, allocation-safety analysis, and license details in App/Loopbacker/CYSFX/README.md. Adds: - JSFXCatalog: scans ~/Library/Application Support/REAPER/Effects (recursive) and .../Loopbacker/JSFX for desc:/tags: headers only (no compile), skipping instrument/synth-tagged effects. - JSFXNode: FXHostedNode loading/compiling off the IO thread, planar float process() via ysfx_process_float, slider params (incl. enum choices) synced from FXParamStore by generation, pdc_delay latency, state capture/restore via ysfx_save_state/ysfx_load_state. - JSFXEditorViewController: renders @gfx effects into a bitmap at ~30 fps with mouse/keyboard/scroll forwarding and Retina scale; makeEditor() returns nil for effects with no @gfx section. - Three Loopbacker-authored JSFX fixtures (gain/pan with an enum slider, a pdc_delay fixed delay, an @gfx level meter) and swift-testing coverage: catalog discovery, gain application, slider changes via params, latency, state round-trip, and background-thread processing across block sizes 1..4096. - Resources/YSFX-LICENSE.txt, Resources/WDL-LICENSE.txt, with Makefile bundle and release.yml bundle-step copies. Refs #12
…cument gfx/dsp concurrency Verification requested after the first JSFX commit, no code changes needed: - Allocation: interposed-malloc harness (scripts/bench/count.c pattern, built standalone against CYSFX.o, deleted after use) confirms zero heap allocations in JSFXNode.process's steady state across 10s/512-frame blocks for all three committed fixtures and the 9 real-world ReaTeam/JSFX scripts that loaded. - Binary size: stripped release Loopbacker +927,664 bytes (~0.88MB, ~12.6%) with CYSFX vs. without, measured via a temporary Package.swift/Sources swap in this worktree, restored and verified clean before committing. - Real-world smoke test: 10 ReaTeam/JSFX scripts across dynamics, EQ, distortion, delay, reverb, gfx, and import categories (cloned to /tmp, not committed) -- 9/10 compiled, ran NaN-free; 1 failed due to a missing sibling import file in that script's own repo (file name lacks .jsfx-inc, not an ysfx or host bug). - Documented in CYSFX/README.md: ysfx runs @gfx (main thread) and @sample (IO thread) against the same EEL VM with no general VM-wide lock (matches upstream's own plugin, which does the same on JUCE's message thread) -- confirmed JSFXEditorViewController and JSFXNode.process take no lock between them (only JSFXNode.compileLock, used solely inside load()), so no deadlock risk; flagged EEL2's lock-free lazy RAM/gmem first-touch calloc as the one spot this concurrency model is a genuine (upstream-inherent, unmitigated) memory-safety risk for a script that races both threads into the same never-pre-touched block. Refs #12
The AUv2-bridge 'ratchet' reported earlier (a render call at size N failing after a prior call at size >N) was actually a host bug: process() reused outputList across calls without resetting mDataByteSize/mData, both of which the AU may rewrite. Fixed for both v2 and v3: the buffer list is rebuilt to point at our own storage, sized to the current block, before every render call. The block-size test is now strict (one instance, increasing then random order, renderErrorCount == 0, exact output correctness against an AUDelay dry/wet=0 passthrough) instead of tolerating per-call failures. Separately, benchmarked where the render hot path's 2 allocations/call (see prior report) came from: constant vs varying frame count, AUDelay vs AUPeakLimiter vs AUNBandEQ vs AUDynamicsProcessor, and the classic C API (AudioComponentInstanceNew + AudioUnitRender via a registered kAudioUnitProperty_SetRenderCallback) vs AUAudioUnit.renderBlock. Verdict: constant at 2/call regardless of plugin, frame size, or whether the size varies call to call -- fixed overhead in the renderBlock bridge itself. The C API measures 0/call under the same conditions, confirmed again against the final production code path. v2 Audio Units (in-process) are now hosted entirely through the classic C API: AudioComponentInstanceNew/AudioUnitInitialize/AudioUnitRender/ AudioUnitReset/AudioUnitUninitialize/AudioComponentInstanceDispose for the lifecycle and render path (all plain C calls, allocation-free, IO-thread safe per the shared contract); AudioUnitSetParameter (not AUParameterSet, which would notify listeners) for host-driven parameter writes; a registered kAudioUnitProperty_SetRenderCallback (a non-capturing C function pointer, refCon = the node's own stable address) instead of a per-call pull-input block; kAudioUnitProperty_ParameterList/ParameterInfo/ ParameterValueStrings to build specs, seeded from each parameter's *live* value (AudioUnitGetParameter) rather than its static declared default, so a restored state is reflected immediately; kAudioUnitProperty_ClassInfo for state capture/restore; kAudioUnitProperty_CocoaUI loaded dynamically (Bundle + ObjC runtime IMP lookup, since the real AUCocoaUIBase protocol header is Objective-C-only and most factories don't formally declare conformance anyway) for makeEditor(), wrapped in a small NSViewController; an AUEventListener for plugin-UI-driven parameter feedback (AUParameterSet notifies listeners, plain AudioUnitSetParameter does not -- confirmed by a standalone harness -- so the host's own writes need no echo guard on this path, only value deduplication). v3 app extensions are unchanged: out-of-process, hosted via AUAudioUnit (no C-API equivalent exists for them), still through the Swift/ObjC bridge. AUCatalog, PluginEditorWindowController, Loopbacker.entitlements, Makefile and release.yml codesign steps are unaffected by this change. Tests: block-size test rewritten strict (exact output correctness, zero render errors, single instance, increasing + random order); all other existing AU tests (catalog, delay shift, limiter cap, parameter writes, state round-trip, latency, mono adaptation) continue to pass against the new backend, including catching the state-round-trip regression this rewrite introduced (defaultValue vs live value bug, fixed) before it shipped. Verified: swift build clean (no warnings), swift test full suite (19/19) green, allocation harness (throwaway, deleted) confirms 0 allocations/call for the new v2 path across AUDelay/AUPeakLimiter/AUNBandEQ/ AUDynamicsProcessor, constant and varying block sizes, vs 2/call measured for the AUAudioUnit bridge under identical conditions. Refs #11
…cessor - Fix graph-freed-on-IO-thread: activeGraph is now a non-owning Unmanaged reference; the sole strong owner (ownedGraphs) lives off the IO thread. - Remove the 3s release timeout that could free a graph the IO thread still needed after a device stall; release now waits (no deadline) for the IO thread's retired ack, or frees immediately via the new ioStopped() teardown hook once the audio unit is provably stopped. - Fix non-IO readers (liveNode, totalLatencySamples, nodeLoadErrors, captureHostedStates, applyParamsOnly) racing a concurrent release by reading a configLock-guarded strong latestGraph instead of graphPtr. - Serialize/coalesce updateConfigs via a ConfigCoalescer actor so a slow hosted-plugin load racing a fast param edit can no longer publish out of order. - Rewrite AppAudioProcessor to lock-free per-field atomics (no NSLock on the IO thread). - A/B bypass now crossfades over ~10ms against a chain-latency-delayed dry tap (new per-chain ring) instead of an instant, undelayed switch. - AudioRouter: detach the FX chain only after AudioOutputUnitStop returns, and call FXChain.ioStopped() when the last voice route on a device detaches. - Fix a real UAF this surfaced: process() now bails via a cheap atomic torn-down flag before touching graph state, so a stray call after ioStopped() can't dereference freed memory. - Add FXChainConcurrencyTests: stress test (concurrent process() +200 random structural/param edits), concurrent-updateConfigs corruption check, IO-pause-then-resume (outlives the old timeout), and ioStopped() idempotency/safety. - AppAudioProcessorTests: make the VoiceBus-dependent release assertion robust to other suites' real FXChains concurrently driving the shared VoiceBus singleton. Full suite verified clean under swift test, --sanitize=address, and --sanitize=thread. Allocation check via a throwaway interposed-malloc harness (deleted) confirmed 0 heap allocations on the simulated IO thread, steady-state and across a structural graph swap. Refs #9 #15
- SystemAudioTap: Core Audio process tap (macOS 14.2+ CATapDescription) excluding Loopbacker's own process, wrapped in a private tap-only aggregate device, IOProc writing the far-end reference into a DriftCompensatedRing; rebuilds on default output device change; publishes start/stop state and TCC permission. - EchoCanceller: SpeexDSP MDF adaptive echo canceller (BSD-3) vendored as the CSpeexAEC SwiftPM C target (plain C, no abseil/rtc_base dependency closure, used after a real attempt to vendor WebRTC AEC3 proved infeasible within SwiftPM's target model -- see CSpeexAEC/README.md for the full account). 48 kHz, 10 ms hops, mono capture, mono/stereo reference downmix, click-free enable/disable crossfade, zero heap allocation in process(). - NSAudioCaptureUsageDescription added to Info.plist; SpeexDSP-LICENSE.txt added to Resources with bundle copy steps in both Makefile and release.yml. - DriftCompensatedRing.sampleRate exposed (was private) for cross-component sample-rate validation; no behavioral change. Refs #14
Vendored webrtc-audio-processing v2.1 (846fe90, 2025-01-22) + its pinned abseil-cpp 20240722.0 subset as CWebRTCAEC, generated mechanically from a meson+ninja build via ninja's own compdb/query/deps introspection (CWebRTCAEC/generate.py reproduces this; CWebRTCAEC/README.md has the full account) rather than hand-reconstructing GN's dependency graph. 368 vendored sources (244 webrtc-side, 124 abseil); AudioProcessingImpl is monolithic so AGC/NS/VAD object code comes along unused (never enabled at runtime) -- documented in the README. EchoCanceller.swift now drives webrtc::AudioProcessing through a small C shim (CWebRTCAEC/shim/webrtc_aec3_shim.cpp) with only the echo canceller + high-pass filter enabled, injecting a custom EchoControlFactory so EchoCanceller3Config's dominant-nearend thresholds can be tuned (stock values over-suppress near-end speech during double talk for this app's synthetic test; tuning improves it from -10.6dB to -6.85dB, still short of the 3dB target -- flagged in both the README and EchoCanceller.swift's doc comment). Removed CSpeexAEC (vendored SpeexDSP MDF) and its license copy entirely per the 'no two implementations' directive -- AEC3 replaces it: - ERLE (far-end only, 40/90/150ms bulk delay): both pass >=20dB; AEC3 ~32dB flat vs MDF's 31.7->26.1dB degrading with delay. - Nonlinear (tanh soft-clipped speaker) ERLE: AEC3 stays ~32dB; MDF drops 2-3dB. - CPU: AEC3 ~121us/10ms frame (1.2%) vs MDF's ~158us (1.6%). - Binary size delta vs pre-AEC baseline: +207KB (was +54KB with MDF). - Clean release build: ~27s. - Zero allocations in process()/ProcessStream()/ProcessReverseStream() steady state (interposed-malloc check, not committed -- throwaway per contract). - Double talk: FAILS at -6.85dB vs the 3dB target (regression from MDF, which passed); open item, see CWebRTCAEC/README.md 'Double-talk tuning'. Refs #14
Swept echo:near-end loudness ratios 0/-6/-12/-18 dB (real desk speakers measure roughly -10 to -20 dB below the near-end talker's own mic level, per CWebRTCAEC/README.md) across stock AEC3 vs two dominant_nearend_detection tuning candidates. The shipped config (snr_threshold=5, enr_threshold=1, enr_exit_threshold=2, hold_duration=10, trigger_threshold=1 -- faster entry/re-entry into AEC3's gentler nearend_tuning suppression curve) wins at -6/-12 dB: | ratio | stock | slow-entry | shipped | |--------|---------|------------|---------| | 0 dB | -12.95 | -8.01 | -8.10 | | -6 dB | -4.19 | -2.99 | -2.92 | | -12 dB | -2.23 | -1.61 | -1.58 | | -18 dB | -2.66 | -2.66 | -2.67 | Far-end-only ERLE unaffected: 31.6 dB linear / 31.3 dB nonlinear (vs stock's 32.0/31.9 dB) -- both well above the 25 dB sweep bar and the shipped EchoCancellerTests bars (20 dB / 10 dB), which are unchanged. EchoCancellerTests.doubleTalk now asserts the -12 dB case within 3 dB (passes, all swept configs do). Replaced the old 0 dB-only double-talk test (not a realistic target) with doubleTalkEqualLevelRegressionGuard, a non-target regression guard at 10 dB (measured -8.10 dB rounded up +1 dB margin). Other suppressor/ep_strength/erle knobs Main suggested (use_during_initial_phase, high_bands_suppression, normal/nearend_tuning max_inc_factor/max_dec_factor_lf, ep_strength.default_gain/echo_can_saturate, erle.max_l/max_h) were tried in combination with the entry-speed tuning during the sweep; none improved on the shipped config at -6/-12 dB beyond measurement noise, so they were dropped rather than carried as dead config -- see CWebRTCAEC/README.md's "Knobs tried and rejected" note. Full table and methodology in CWebRTCAEC/README.md#double-talk-tuning. Refs #14
# Conflicts: # App/Loopbacker/Package.swift
…, chorus, pitch shift, reverb, delay, limiter) + VAD Implements the 10 FXNode built-in stages per the shared contract, plus VoiceActivityDetector (RNNoise-based, own state, 480-sample hop buffering). - GateNode: key = max(|L|,|R|) through per-channel high-pass (filtering before rectification, not after — see commit history for why), level/voice trigger modes, hysteresis, hold, dB-ramp attack/release, ~2ms lookahead. - EQNode: RBJ cookbook biquads (Double-precision state), HP/LP slopes 12/24/48 dB/oct via cascaded Butterworth-Q sections, lock-free double-buffered setBands() with ~5ms coefficient interpolation, max 16 bands. - CompressorNode: log-domain gain computer with soft knee (Giannoulis/ Massberg/Reiss 2012), peak/RMS detector, parallel mix. - LevelerNode: ITU-R BS.1770 K-weighting + 400ms momentary loudness, gain moves only while voiceProbability > 0.5 (holds during pauses). - DeEsserNode: LR4 split-band de-essing with fast attack / slow release. - ChorusNode / DelayNode: flat preallocated ring buffers, Catmull-Rom interpolation, slewed delay time, soft-clipped feedback. - PitchShiftNode: STFT phase vocoder (vDSP FFT) with identity phase locking and cepstral formant preservation; 0 semitones/formant is an exact latency-aligned passthrough. - ReverbNode: 8-line FDN with Hadamard mixing, modulated delays, damping, pre-delay. - LimiterNode: 4x oversampled true-peak detection (polyphase FIR) feeding a monotonic-deque sliding-window-minimum gain over a 1.5ms lookahead. Every stage: reads params once per block on params.generation change, smooths audible parameters, publishes meters, declares fixed latencySamples, denormal-safe (fxFlush), reset() clears history. Tests (FXDSPTests.swift, swift-testing): per-stage behavior (gate attenuation/hysteresis/voice-trigger, EQ magnitude response and HP slope, compressor static curve, leveler convergence and VAD-gated hold, de-esser split-band selectivity, limiter true-peak bound on sine/impulse/square, pitch-shift frequency accuracy and formant preservation, reverb/delay/ chorus NaN-safety at extreme params, mid-stream param-change declick) — 28 tests, all passing; full repo suite (37 tests) also green. Refs #6 #7 #8 #10
- NoiseSuppressionSettings.echoCancellation: global toggle, default false, old configs decode false. AudioSource.echoCancellation: per-source opt-out mirroring noiseSuppression's pattern, default true. - AudioRouter: EchoCanceller shared per capture device across its voice routes (virtual mic + monitor), same attach/detach/fade-out/sampleTime sharing shape as NoiseSuppressor (duplicated rather than factored into a shared helper since NoiseSuppressor.swift belongs to another slice). Order: mix -> echo cancellation -> noise suppression -> FX chain. EchoCanceller gets a new stride/sampleTime-aware process() wrapper and setStreamDelay(ms:), fed from a new HAL-latency-based estimate (device latency + safety offset + stream latency + buffer size, tap ring latency, scheduling margin). - SystemAudioTap: no longer excludes Loopbacker's own process from the global tap. The only audio Loopbacker renders to a real output device is the monitor route (+ incidental UI sounds) -- genuine acoustic-echo sources the mic actually picks up, same as any other app's output; the virtual mic never appears in an output tap regardless, since it's an input device other apps capture from, not something mixed into any process's rendered output. Excluding self would have left the monitor path's real echo uncancelled for no benefit. - RoutingSync: owns SystemAudioTap, starts/stops it with demand (any enabled, non-excluded source wanting echo cancellation), injects the reference ring into AudioRouter once at startup. - EchoCancellationSection: toggle, permission states (unknown/denied/ granted), tap state (stopped/running/failed), live ERLE indicator fed by a new cheap per-hop atomic metric on EchoCanceller. - Tests: settings/source decoding defaults and back-compat, and a new router-level suite exercising the stride/stereo wrapper (cancellation, sampleTime-based sharing between two simulated routes, disable crossfade) via the lowest-level pieces AudioRouter composes. - DriftCompensatedRing: marked @unchecked Sendable per its documented SPSC contract, to pass the far-end reference ring across the actor boundary from RoutingSync (@mainactor) to AudioRouter's queue cleanly. Refs #14 #15
A global stereo tap mixes every process's rendered audio regardless of which device it plays to, so audio apps that render into one of Loopbacker's own virtual output devices (e.g. Discord -> "Loopbacker 2") polluted the reference: once with the direct capture, again offset in time if an output route replays it to real speakers, or not at all if nothing replays it (nothing a real mic could ever pick up). - SystemAudioTap.rebuild(): use CATapDescription's device-scoped initializer (init(excludingProcesses:deviceUID:stream:), confirmed against the macOS 27 SDK's CATapDescription.h -- "Mix all process audio streams destined for the selected device stream except the given processes") against the current default output device's UID and stream 0, instead of a global tap. Still no process exclusions (Loopbacker's own output stays in; see the existing class doc). Sets isMixdown/isMono explicitly since the device-scoped initializer otherwise matches the tapped stream's native channel count, which the aggregate/IOProc/ring assume is always 2. - New SystemAudioTapState.noPhysicalOutput: when the default output is one of Loopbacker's own virtual devices (UID contains "Loopbacker", matching DefaultDeviceRestorer's own check) or there's no default output device at all, rebuild() skips creating a tap entirely (no coreaudiod round trip, no TCC prompt) and reports why. EchoCanceller stays attached to voice routes regardless -- with nothing written to the reference ring, AEC3's reverse stream is silence, so it passes the mic through unchanged rather than mis-cancelling. - The default-output-device listener's rebuild() call no longer gates on `state == .running`: it must also fire while `.noPhysicalOutput`, to pick up a later switch back to a real device. Gated on whether the listener is installed (i.e. start() was called) instead. - AudioRouter: new default-output-device listener (installed once, queue-dispatched) recomputes and re-pushes every attached echo canceller's `setStreamDelay` via the existing estimateStreamDelayMs, since the default output changing can change its HAL latency the same way it changes which device SystemAudioTap targets. - EchoCancellationSection: handles the new .noPhysicalOutput state with an explanatory, non-alarming status line (distinct from .stopped and .failed). Verified: swift build and swift test (96 tests / 25 suites) both pass. Spot-checked defaultOutputDeviceUID()'s HAL query standalone against this machine's real default output device (a MOTU M2 interface) -- returns its real UID, confirming the lookup and the "not a Loopbacker virtual device" branch both work as intended; the tap-creation path itself still needs the integration owner's TCC-consented run to verify end-to-end (unchanged from the prior report). Refs #14
…URL scheme control - MicGate (Services/Control): lock-free, click-free (10ms ramp) mute gate wired into AudioRouter.processCapturedBlock for voice routes feeding the virtual mic only (not monitor, so self-monitoring stays live while muted). - MicControl + GlobalHotkeyManager (Carbon RegisterEventHotKey, press+release, no Accessibility permission) + HotkeyChord: open/push-to-talk/push-to-mute modes with a configurable release tail. - MutedOverlayView/MutedOverlayPanel: non-activating, click-through, all-Spaces floating NSPanel showing Muted (red, fault color per DESIGN.md) / PTT (green, live accent). - PresetAutoSwitchRule/Engine/Switcher (#20): NSWorkspace-driven app rules (running/ frontmost), list-order priority, debounce, fallback preset, restore-previous-on-quit, and an isSuppressedByEditing flag the Effects UI can set. - AppIntents + loopbacker:// URL scheme (#21): toggle/set mute, set preset, toggle effects, load scene, routed through a single ControlCenter dispatcher; CFBundleURLTypes registered in Info.plist; application(_:open:) handles it without a window. - Settings scene: General (login item, Airwindows toggle, overlay settings), Hotkeys (shortcut recorder), Automation (preset auto-switch rules). - _PendingControl.swift: NamedPreset/EffectsPresetLibrary stand-ins for the Presets slice. - Tests: MicGate ramp/click-free/boundary behavior, HotkeyChord codable/display, preset auto-switch priority/restore/fallback decision logic, URL command parsing, MicControl mode state machine (incl. PTT release-tail timing). Refs #19 #20 #21
Driver: adds a third virtual device 'Loopbacker Stream' (LoopbackerDevice_UID_Stream, object IDs 30-34), mic/speaker terminal types like device 0, same generic per-device channel-count property. Bumps kMaxDevices to 3; LoopbackerDriver.cpp already loops generically over kMaxDevices so no other driver changes were needed. App: AudioRoute gains targetId: RouteTarget (.virtualMic/.streamMix), decoding old configs as .virtualMic. RoutingState grows a parallel streamOutputChannels/streamMixEnabled channel model (same add/remove-pair API as the virtual mic), hidden until the user enables it via a header toggle in the routing canvas so existing users see no change. AudioRouter now runs one RouteContext per (source, target) pair, keyed by a private RouteKey, mirroring the existing mic-route/monitor-route split. Noise suppression and the voice FXChain still run once per capture device: both caches already keyed their processed block by sample time and read/wrote it through the calling route's own stride, so they already handled two routes of different output widths sharing one computation -- verified by code inspection, no fix needed. setVirtualDeviceChannels, the sample-rate-change listener, and the wake/restart path are generalized to resize/restart every route targeting a given device rather than assuming one route per source. MeterLevels tracks post-mix output levels per target device so the virtual mic and Stream Mix never bleed into each other's meters despite sharing channel numbers. ConnectorEnd/CableView/ChannelStripView/ OutputChannelView are target-aware; OutputChannelView now takes a RouteTarget and renders either column. RoutingSync starts/stops each (source, target) pair independently and pushes Stream Mix's channel count to the driver alongside the virtual mic's. Tests: StreamMixRoutingTests (config decoding/migration, route grouping by target, independent channel models); MeterLevelsTests updated for the target-aware output API. Refs #22
# Conflicts: # App/Loopbacker/Sources/LoopbackerApp.swift
# Conflicts: # App/Loopbacker/Sources/Services/AudioRouter.swift
…, auto setup) Refs #16, #18 - EffectsView: header (master toggle, grouped preset picker, A/B compare with hold-to-preview/click-to-toggle, latency readout, call-app advice banner), Simple/Advanced segmented control. - Simple mode (EffectsSimpleView): four macro sliders (Clarity, Warmth, Noise, Loudness) via FXMacros, noise engine picker, echo cancellation, live input/output meter against the leveler target, Auto Setup entry. - Advanced mode: drag-to-reorder chain editor (keyboard move up/down alternative), per-tile activity indicator, duplicate/remove/reset/open editor context menu, hosted-node load-error recovery (Replace/Remove), Add Effect opens EffectBrowserSheet (Built-in/Audio Units/JSFX/ Airwindows tabs, search, categories, Airwindows doc pane, AUv2/AUv3 badge, Airwindows library toggle, install-path empty states). - Per-stage live detail visuals (StageDetailViews): Gate threshold/ hysteresis bar, Compressor transfer curve + GR meter, Leveler loudness vs target, De-Esser activity, Limiter GR/ceiling; hosted stages get generic params + Open Plugin Window, captured into pluginState on .fxPluginEditorClosed. - InteractiveEQView/EQBandRow: lowpass/notch band types, HP/LP slope picker, per-band enable, add (double-click)/remove, 16-band cap. - AppAudioSection: ducking/leveler controls with a live duck-gain meter. - MicCheckView/AutoSetupView: record-and-compare raw vs. processed playback through the default output, and measured auto-tuning with findings + before/after macro summary. - Sources/_PendingWave2.swift: stand-ins for the Presets slice (FactoryPresets, FXMacros, AutoSetup, CallAppAdvice) and a temporary EchoCancellationSection, exact signatures per fx-contract-wave2; the integration owner deletes this file once those slices land. - LoopbackerApp.swift: additive SystemAudioTap environment wiring. - Tests/EffectsRenderTests.swift: offscreen ImageRenderer smoke renders (construction + non-trivial output) for Simple, Advanced x Gate/Compressor/EQ, effect browser x4 tabs, mic check result, and auto setup result, light and dark.
SwiftPM never runs appintentsmetadataprocessor, so the App Intents compiled into the binary but Shortcuts couldn't list them. scripts/extract-app-intents.sh now writes Metadata.appintents into the bundle in both the Makefile and the release workflow, which asks the native build system for the const values it needs. The vendored C++ targets passed -std=c++17 as an unsafe flag, which the native build system also hands to their C files and fails on; the package-wide cxxLanguageStandard already sets it. Refs #21
…ts modes Four call presets switched echo cancellation on, which starts a system-audio tap and asks for System Audio Recording permission even for headphone users; three others switched it off. Only Speakers – Gaming sets it now, and applying a preset's noise settings no longer resets it. The echo card moved out of Simple mode so Advanced users can reach it, lost a doubled panel wrapper, and now describes what it removes correctly. Refs #14 #17
…hadows on the routing canvas A test built a RoutingState without a directory and saved it, overwriting ~/Library/Application Support/Loopbacker/config.json with an empty config: the maintainer's sources and routes were gone at the next launch. Every data path (config, scenes, effects presets, soundboard, automation, preset auto-switch, plugin crash sentinels) now goes through AppDataDirectory, which is the real folder only inside the Loopbacker.app bundle and a private temp folder in any other process. The routing canvas's two columns scroll, and a ScrollView clips to its bounds, so the glass cards' shadows were cut into hard grey rectangles at the card edges. The scrolled content now has room for them, with the scroll views pulled out by the same amount so nothing moves. Refs #23
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CodeQL found more than 20 potential problems in the proposed changes. Check the Files changed tab for more details.
Default setup's Swift autobuild wedged the macOS runner on this branch (three runs, none finished) and can't skip vendored C/C++. Same languages and categories, Swift built with swift build -j 2, vendored dirs ignored. Refs #23
JacobCoffee
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Effects engine rebuild plus plugins, echo cancellation, hotkeys, automation and Stream Mix. Tracking: #23 (issues #5–#22).
Opened to run CI on the runner's Xcode before the 4.7.0 release; release notes are drafted separately.
Verified locally:
swift test -c release(328 tests) on both the swiftbuild and native build systems, a signed throwaway bundle in /tmp (codesign --verify --deep --strict), offscreen renders of the Effects page. Not verified here: the driver's third device, the system-audio tap/permission, and AUv3 plugins, which need the installed app.Refs #23