Fix recording perms check for manual audio (#780)

We don't need to check recording perms & audio session for manual
rendering mode since it doesn't use the device (mic).

Author: hiroshihorie

.changes/recording-perms-check-only-device

@@ -0,0 +1 @@
+patch type="fixed" "Only check audio recording perms for device rendering mode"

Sources/LiveKit/Audio/AudioDeviceModuleDelegateAdapter.swift

@@ -45,8 +45,8 @@ class AudioDeviceModuleDelegateAdapter: NSObject, LKRTCAudioDeviceModuleDelegate
         let entryPoint = audioManager.buildEngineObserverChain()
         let result = entryPoint?.engineWillEnable(engine, isPlayoutEnabled: isPlayoutEnabled, isRecordingEnabled: isRecordingEnabled) ?? 0
 
-        // At this point mic perms / session should be configured for recording.
-        if result == 0, isRecordingEnabled {
+        // At this point mic perms / session should be configured for recording (only if device rendering mode).
+        if result == 0, !engine.isInManualRenderingMode, isRecordingEnabled {
             // This will block WebRTC's worker thread, but when instantiating AVAudioInput node it will block by showing a dialog anyways.
             // Attempt to acquire mic perms at this point to return an error at SDK level.
             let isAuthorized = LiveKitSDK.ensureDeviceAccessSync(for: [.audio])

Sources/LiveKit/Audio/Manager/AudioManager.swift

@@ -407,16 +407,18 @@ extension AudioManager {
 
 // SDK side AudioEngine error codes
 let kAudioEngineErrorFailedToConfigureAudioSession = -4100
+let kAudioEngineErrorAudioSessionCategoryRecordingRequired = -4102
 
 let kAudioEngineErrorInsufficientDevicePermission = -4101
-let kAudioEngineErrorAudioSessionCategoryRecordingRequired = -4102
 
 extension AudioManager {
     func checkAdmResult(code: Int) throws {
         if code == kAudioEngineErrorFailedToConfigureAudioSession {
             throw LiveKitError(.audioSession, message: "Failed to configure audio session")
         } else if code == kAudioEngineErrorInsufficientDevicePermission {
             throw LiveKitError(.deviceAccessDenied, message: "Device permissions are not granted")
+        } else if code == kAudioEngineErrorAudioSessionCategoryRecordingRequired {
+            throw LiveKitError(.audioSession, message: "Recording category required for audio session")
         } else if code != 0 {
             throw LiveKitError(.audioEngine, message: "Audio engine returned error code: \(code)")
         }