Refactor IOVideoUnit#attachCamera method.

Examples/iOS/IngestViewController.swift

@@ -44,10 +44,11 @@ final class IngestViewController: UIViewController {
         pipIntentView.isUserInteractionEnabled = true
         view.addSubview(pipIntentView)
 
+        // If you're using multi-camera functionality, please make sure isMultiCamSessionEnabled = true. Initialization point.
+        stream.isMultiCamSessionEnabled = true
         if let orientation = DeviceUtil.videoOrientation(by: UIApplication.shared.statusBarOrientation) {
             stream.videoOrientation = orientation
         }
-
         stream.isMonitoringEnabled = DeviceUtil.isHeadphoneConnected()
         stream.audioSettings.bitRate = 64 * 1000
         stream.bitrateStrategy = VideoAdaptiveNetBitRateStrategy(mamimumVideoBitrate: VideoCodecSettings.default.bitRate)
@@ -62,18 +63,19 @@ final class IngestViewController: UIViewController {
         super.viewWillAppear(animated)
         let back = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: currentPosition)
 
-        // If you're using multi-camera functionality, please make sure to call the attachMultiCamera method first. This is required for iOS 14 and 15, among others.
-        if #available(iOS 13.0, *) {
-            let front = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .front)
-            stream.videoCapture(for: 1)?.isVideoMirrored = true
-            stream.attachMultiCamera(front)
-        }
         stream.attachCamera(back) { error in
             logger.warn(error)
         }
         stream.attachAudio(AVCaptureDevice.default(for: .audio), automaticallyConfiguresApplicationAudioSession: false) { error in
             logger.warn(error)
         }
+
+        if #available(iOS 13.0, *) {
+            let front = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .front)
+            stream.videoCapture(for: 1)?.isVideoMirrored = true
+            stream.attachMultiCamera(front)
+        }
+
         stream.addObserver(self, forKeyPath: "currentFPS", options: .new, context: nil)
         (view as? (any NetStreamDrawable))?.attachStream(stream)
         NotificationCenter.default.addObserver(self, selector: #selector(didInterruptionNotification(_:)), name: AVAudioSession.interruptionNotification, object: nil)

HaishinKit.xcodeproj/project.pbxproj

@@ -190,6 +190,7 @@
 		BC56765B2AD2AED800524F7E /* AudioCapture.swift in Sources */ = {isa = PBXBuildFile; fileRef = BC56765A2AD2AED800524F7E /* AudioCapture.swift */; };
 		BC570B4828E9ACC10098A12C /* IOUnit.swift in Sources */ = {isa = PBXBuildFile; fileRef = BC570B4728E9ACC10098A12C /* IOUnit.swift */; };
 		BC6692F32AC2F717009EC058 /* NetBitRateStrategyConvertible.swift in Sources */ = {isa = PBXBuildFile; fileRef = BC6692F22AC2F717009EC058 /* NetBitRateStrategyConvertible.swift */; };
+		BC6889782B011AEB0026A4C2 /* IOCaptureSession.swift in Sources */ = {isa = PBXBuildFile; fileRef = BC6889772B011AEB0026A4C2 /* IOCaptureSession.swift */; };
 		BC6FC91E29609A6800A746EE /* ShapeFactory.swift in Sources */ = {isa = PBXBuildFile; fileRef = BC6FC91D29609A6800A746EE /* ShapeFactory.swift */; };
 		BC6FC9222961B3D800A746EE /* vImage_CGImageFormat+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = BC6FC9212961B3D800A746EE /* vImage_CGImageFormat+Extension.swift */; };
 		BC701F332AAD808F00C4BEFE /* SRTHaishinKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = BCCC45962AA289FA0016EFE8 /* SRTHaishinKit.framework */; };
@@ -602,6 +603,7 @@
 		BC56765A2AD2AED800524F7E /* AudioCapture.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AudioCapture.swift; sourceTree = "<group>"; };
 		BC570B4728E9ACC10098A12C /* IOUnit.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IOUnit.swift; sourceTree = "<group>"; };
 		BC6692F22AC2F717009EC058 /* NetBitRateStrategyConvertible.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NetBitRateStrategyConvertible.swift; sourceTree = "<group>"; };
+		BC6889772B011AEB0026A4C2 /* IOCaptureSession.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IOCaptureSession.swift; sourceTree = "<group>"; };
 		BC6FC91D29609A6800A746EE /* ShapeFactory.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShapeFactory.swift; sourceTree = "<group>"; };
 		BC6FC9212961B3D800A746EE /* vImage_CGImageFormat+Extension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "vImage_CGImageFormat+Extension.swift"; sourceTree = "<group>"; };
 		BC7C56B6299E579F00C41A9B /* AudioCodecSettings.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AudioCodecSettings.swift; sourceTree = "<group>"; };
@@ -1048,6 +1050,7 @@
 				BCFC51FD2AAB420700014428 /* IOAudioResampler.swift */,
 				BC5019C02A6D266B0046E02F /* IOAudioRingBuffer.swift */,
 				29B876891CD70AFE00FC07DA /* IOAudioUnit.swift */,
+				BC6889772B011AEB0026A4C2 /* IOCaptureSession.swift */,
 				BC1102492925147300D48035 /* IOCaptureUnit.swift */,
 				BC0F1FD92ACC4CC100C326FF /* IOCaptureVideoPreview.swift */,
 				29B8768B1CD70AFE00FC07DA /* IOMixer.swift */,
@@ -1727,6 +1730,7 @@
 				BC1DC4FB2A02868900E928ED /* FLVVideoFourCC.swift in Sources */,
 				2976A47E1D48C5C700B53EF2 /* IORecorder.swift in Sources */,
 				BC110257292E661E00D48035 /* MultiCamCaptureSettings.swift in Sources */,
+				BC6889782B011AEB0026A4C2 /* IOCaptureSession.swift in Sources */,
 				BC3802142AB5E7CC001AE399 /* IOAudioCaptureUnit.swift in Sources */,
 				29B876B21CD70B2800FC07DA /* RTMPMuxer.swift in Sources */,
 				2958912E1EEB8F4100CE51E1 /* FLVSoundType.swift in Sources */,

Sources/Media/IOAudioCaptureUnit.swift

@@ -1,7 +1,7 @@
+#if os(iOS) || os(tvOS) || os(macOS)
 import AVFoundation
 import Foundation
 
-#if os(iOS) || os(tvOS) || os(macOS)
 @available(tvOS 17.0, *)
 final class IOAudioCaptureUnit: IOCaptureUnit {
     typealias Output = AVCaptureAudioDataOutput
@@ -13,7 +13,7 @@ final class IOAudioCaptureUnit: IOCaptureUnit {
 
     func attachDevice(_ device: AVCaptureDevice?, audioUnit: IOAudioUnit) throws {
         setSampleBufferDelegate(nil)
-        detachSession(audioUnit.mixer?.session)
+        audioUnit.mixer?.session.detachCapture(self)
         guard let device else {
             self.device = nil
             input = nil
@@ -23,7 +23,7 @@ final class IOAudioCaptureUnit: IOCaptureUnit {
         self.device = device
         input = try AVCaptureDeviceInput(device: device)
         output = AVCaptureAudioDataOutput()
-        attachSession(audioUnit.mixer?.session)
+        audioUnit.mixer?.session.attachCapture(self)
         setSampleBufferDelegate(audioUnit)
     }
 

Sources/Media/IOAudioUnit.swift

@@ -59,35 +59,30 @@ final class IOAudioUnit: NSObject, IOUnit {
     #if os(tvOS)
     private var _capture: Any?
     @available(tvOS 17.0, *)
-    var capture: IOAudioCaptureUnit {
+    private var capture: IOAudioCaptureUnit {
         if _capture == nil {
             _capture = IOAudioCaptureUnit()
         }
         return _capture as! IOAudioCaptureUnit
     }
     #elseif os(iOS) || os(macOS)
-    private(set) var capture: IOAudioCaptureUnit = .init()
+    private var capture: IOAudioCaptureUnit = .init()
     #endif
 
     #if os(iOS) || os(macOS) || os(tvOS)
     @available(tvOS 17.0, *)
     func attachAudio(_ device: AVCaptureDevice?, automaticallyConfiguresApplicationAudioSession: Bool) throws {
-        guard let mixer else {
-            return
-        }
-        mixer.session.beginConfiguration()
-        defer {
-            mixer.session.commitConfiguration()
-        }
-        guard let device else {
-            try capture.attachDevice(nil, audioUnit: self)
-            inputFormat = nil
-            return
+        try mixer?.session.configuration { session in
+            guard let device else {
+                try capture.attachDevice(nil, audioUnit: self)
+                inputFormat = nil
+                return
+            }
+            try capture.attachDevice(device, audioUnit: self)
+            #if os(iOS)
+            session.automaticallyConfiguresApplicationAudioSession = automaticallyConfiguresApplicationAudioSession
+            #endif
         }
-        try capture.attachDevice(device, audioUnit: self)
-        #if os(iOS)
-        mixer.session.automaticallyConfiguresApplicationAudioSession = automaticallyConfiguresApplicationAudioSession
-        #endif
     }
     #endif