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feat(ios): real echo cancellation/NR via native Voice-Processing engine

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iOS "voice chat" had echo and no noise suppression: real iOS AEC/NS/AGC
come only from Apple's Voice-Processing I/O unit (VPIO), but the core
plays/captures via miniaudio's plain RemoteIO units, so .voiceChat mode
alone never engaged AEC.

Core (ABI PATCH 1->2):
- vc_set_mixed_output_sink + vc_set_external_playback. In external mode the
  AudioEngine opens no hardware playback device; a mixer-timer thread drives
  on_playback (decode+mix) on a ~20ms cadence and ships the final mix to the
  sink. start() also skips the hardware capture device when the MIC stream is
  external_feed (AudioParams.external_capture).
- New white-box test test_external_playback (drives the timer with no hw).

iOS/Swift:
- StreamDescriptor.externalFeed; VoiceCatClient.setMixedOutputSink /
  setExternalPlayback wrappers.
- IOSVoiceProcessingEngine: AVAudioEngine + setVoiceProcessingEnabled; mic
  tap -> feedPcm, mixed-sink lock-free ring -> AVAudioSourceNode (both share
  the VPIO unit so AEC has its reference signal).
- IOSAudioRouter.currentConfigUsesVoiceProcessing scopes VPIO to the AEC
  presets; SessionState join/leave + reconcileVoicePath() switch paths;
  Voice Chat defaults to speaker; Settings surfaces AEC/NS state.

Known: pending on-device verification; a few bugs to fix afterward.
This commit is contained in:
Talon
2026-06-22 02:38:01 +02:00
parent e806b698ec
commit 6c17881cc0
19 changed files with 755 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
clients/apple/iOS/VoiceCatiOS.xcodeproj/project.pbxproj
View File

@@ -33,6 +33,7 @@
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BBBB0000000000000000004B /* IOSAudioRouter.swift in Sources */ = {isa = PBXBuildFile; fileRef = BBBB0000000000000000002F /* IOSAudioRouter.swift */; };
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BBBB0000000000000000002F /* IOSAudioRouter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IOSAudioRouter.swift; sourceTree = "<group>"; };
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@@ -143,6 +145,7 @@
BBBB00000000000000000019 /* SessionState.swift */,
BBBB0000000000000000001A /* AudioSessionManager.swift */,
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CCCC00000000000000000002 /* BroadcastAudioPump.swift */,
@@ -296,6 +299,7 @@
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