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fix(ios): stereo mic + A2DP output, add vc_audio_restart ABI

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Diagnosed by comparing against TeamTalk5 (Client/iTeamTalk), which
achieves stereo mic + A2DP output. Five fixes:

1. configureStereoCapture now calls setPreferredInput +
   setInputDataSource (mirroring TeamTalk5's SoundDevicesModel).
   Previously omitted based on incorrect diagnosis that
   setPreferredInput collapsed A2DP — the real culprit was
   setPreferredInputNumberOfChannels(2), which neither project uses.

2. New C ABI: vc_audio_restart (full stop + re-init, unlike
   suspend/resume which only stop/start). Swift wrapper added.
   The withAudioSuspend wrapper that used it was removed after
   on-device testing showed it killed all audio (including
   VoiceOver) when switching presets — the core's
   set_capture_channels handles engine restart internally.

3. Bluetooth options: Voice Chat preset now includes BOTH
   .allowBluetoothHFP AND .allowBluetoothA2DP (matching TeamTalk5's
   UtilSound.swift:228). Previously HFP-only blocked A2DP headphones.

4. Capture channels now reset when switching stereo→mono via
   selectCaptureChannels/applyPreset. AudioSessionManager tracks
   activeMicStreamId (set by SessionState on join/leave voice).

5. Docs synced: voice.md, tech-stack.md, architecture.md,
   PROGRESS.md. Removed stale setPreferredInputNumberOfChannels(2)
   references.

Verified: ctest --preset dev 21/21 green, iOS client builds.
Stereo mic + A2DP output still needs on-device debugging — the
core recipe is correct but iOS 26 route behavior requires
hands-on testing with a debugger.
This commit is contained in:
Talon
2026-06-19 16:58:21 +02:00
parent 1a1c8a1dfe
commit fdcc84fb42
14 changed files with 399 additions and 100 deletions
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14
clients/apple/iOS/VoiceCatiOS/AudioSessionManager.swift
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@@ -10,6 +10,11 @@ final class AudioSessionManager {
weak var client: VoiceCatClient?
/// The stream ID of the currently active local MIC stream, if any. Set by `SessionState`
/// when the user joins/leaves voice so `IOSAudioRouter` can reset the core's capture
/// channel count (e.g. when switching stereo → mono) without going through `SessionState`.
var activeMicStreamId: UInt32?
/// Tracks whether WE activated the session. The session must be active whenever the
/// AudioEngine is running (for capture OR playback). Previously, the session was only
/// activated when the user joined voice (startMicStream), which meant:
@@ -44,8 +49,15 @@ final class AudioSessionManager {
return
}
IOSAudioRouter.shared.applyConfiguration()
try AVAudioSession.sharedInstance().setActive(true, options: [])
let session = AVAudioSession.sharedInstance()
try session.setActive(true, options: [])
isSessionActive = true
// For the A2DP output presets, make sure output isn't pinned to the built-in speaker.
// A2DP routing in .playAndRecord is fragile; clearing any speaker override after the
// session is live nudges iOS to honor the Bluetooth output route.
if IOSAudioRouter.shared.wantsA2dpOutput {
try? session.overrideOutputAudioPort(.none)
}
let route = AVAudioSession.sharedInstance().currentRoute
let outputNames = route.outputs.map { $0.portName }.joined(separator: ", ")
let inputNames = route.inputs.map { $0.portName }.joined(separator: ", ")