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feat(ios): audio overhaul, Join/Leave Voice, channel-id sync fix, stereo mic capture

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Three iOS client problems fixed plus a new core stereo-mic capture ABI:

1. Channel-id sync bug (mic button permanently dimmed): SessionState never
   synced currentChannelId from the self user's channelId on connect, so the
   mic button (gated on currentChannelId == 0) stayed dimmed. Added
   syncSelfChannel() (mirrors macOS MainWindowController.swift:461,491,522);
   called from init/.channelList/.userJoined/.userLeft/.userUpdated/.joinResult.
   Added applyServerMuteState() + serverMuted/serverDeafened to VoiceState.

2. Join/Leave Voice button: replaced icon-only mic toggle with explicit
   text button (parity with macOS). Mute/deafen disable when not in voice.

3. IOSAudioRouter.swift (new): full AVAudioSession routing layer — input
   port selection, built-in mic orientation/polar patterns, Bluetooth
   HFP/A2DP/Off modes, Standard/Raw mic processing, stereo capture, AirPlay,
   UserDefaults persistence. AudioSessionManager delegates to it.

4. Core stereo-mic capture (append-only ABI): vc_set_capture_channels()
   lets the core open the mic device in stereo (2-ch interleaved). LocalStream
   gains capture_channels; ensure_audio_running reads it; audio_engine.cpp
   capture_accum_ + on_capture updated to channel-aware accumulation. Test
   test_stereo_mic_capture (headless, L!=R stereo round-trip). Swift wrapper
   VoiceCatClient.setCaptureChannels.

5. Settings UI rework: AVAudioSession-derived input/output tree replaces
   miniaudio device picker.

6. iOS deployment target raised to 18.0 (Package.swift + project.pbxproj).
   swift-tools-version 6.0 with swiftLanguageModes .v5.

Docs: tech-stack.md, architecture.md, voice.md, roadmap.md, building.md
updated; stale 'vc_audio_suspend/resume deferred' claims corrected.

Verified: ctest --preset dev 21/21 green; swift test 6/6 green;
xcodebuild -target VoiceCatiOS -sdk iphonesimulator BUILD SUCCEEDED.
This commit is contained in:
Talon
2026-06-19 13:17:52 +02:00
parent a10a18aebe
commit 9fc51cffc4
23 changed files with 861 additions and 83 deletions
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docs/tech-stack.md
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@@ -29,9 +29,9 @@ explicit resampling (speexdsp/libsamplerate) is only needed when a device can't
|---------|--------|-------|
| Language | **Swift 5.9+** | Direct **Swift↔C interop** — the C ABI (`voicecat.h`) is imported as a Clang module (`import VoiceCatC`) via a module map in the XCFramework headers; no manual struct/function redeclaration (unlike the C# P/Invoke layer). A Swift wrapper (`VoiceCatCore` package) provides Swift-idiomatic types on top. |
| UI — macOS | **AppKit** | Chosen over SwiftUI for the most mature, granular **VoiceOver** accessibility story (per-control `accessibilityLabel`/`accessibilityHelp`/`accessibilityRole`, `NSAccessibility.post(.announcement)` for live announcements) — the same rationale that drove the Windows client to WinForms over WinUI 3 for screen-reader (NVDA/JAWS/Narrator) UIA support (resolved decision in `docs/roadmap.md`). macOS 14 (Sonoma) deployment target. |
| UI — iOS | **SwiftUI** | iOS has a narrower control surface (no channel-tree moderation, etc.) and SwiftUI's VoiceOver support is sufficient; revisit if gaps emerge. |
| UI — iOS | **SwiftUI** | iOS has a narrower control surface (no channel-tree moderation, etc.) and SwiftUI's VoiceOver support is sufficient; revisit if gaps emerge. iOS 18.0 deployment target (unlocks newest AVAudioSession APIs: stereo capture, polar patterns, data sources). |
| Shared core | **VoiceCatCore** Swift Package | One Swift library wrapping the C ABI, consumed by both the macOS AppKit app and the iOS SwiftUI app. Mirrors the C# `VoiceCat.Interop` layer. Events delivered on `@MainActor` via a coalesced `DispatchQueue.main` drain (the Swift analog of C#'s `Channel<VoiceCatEvent>` + 30ms WinForms Timer pump). |
| Audio session (iOS) | **AVAudioSession** | App owns category `.playAndRecord` + `.voiceChat` mode, mic permission, interruption/route-change handling; calls `vc_audio_suspend/resume` on the core. macOS uses CoreAudio via the core directly. (`vc_audio_suspend`/`vc_audio_resume` ABI hooks are deferred until the iOS client milestone — keep ABI stable.) |
| Audio session (iOS) | **AVAudioSession** + **IOSAudioRouter** | App owns category `.playAndRecord`, mic permission, interruption/route-change handling; calls `vc_audio_suspend`/`vc_audio_resume` (implemented) on the core. All iOS audio routing (input port selection, mic orientation/polar patterns, HFP vs A2DP, measurement/raw mode, stereo capture via `setPreferredInputNumberOfChannels(2)`) is driven from Swift via `AVAudioSession` *before* the core (miniaudio) opens its device — miniaudio does NOT touch `AVAudioSession` on iOS. The `IOSAudioRouter` singleton owns this; the core is told the channel count via `vc_set_capture_channels`. macOS uses CoreAudio via the core directly. |
| Packaging | Swift Package + Xcode project | Core shipped as an **XCFramework** binary target — a fat static library (`libvoicecat-fat.a`) bundling `libvoicecat.a` + all vcpkg static deps (protobuf/mbedtls/sodium/opus/sqlite3/spdlog/asio), so the Swift Package links a single self-contained `.a` per slice. macOS slice validated; iOS device + sim slices are scaffolding. |
| Future | CallKit / PushKit | For background VoIP + incoming-call UX on iOS. Post-v1. |