I saw NSNetServiceBrowser is marked as deprecated on Apple document. But I cannot see replacement of this class. I need to write mDNS finder program. Should I use NSNetServiceBrowser or another class?

I test with VLC as RTSP audio client on MacOS. Every 5 minutes, I hear noise. The noise continue for 3 sec, happens every 5 min exactly. During noise period, kernel_task use +25% CPU for 3 sec, Console->wifi.log put message staring with SCAN request received from pid ??? (locationd) with priority=2, qos=-1 (default), frontmost=no I checked Wireshark, it receives RTP/UDP packets every 20ms. But during noise period, no package for 140ms. That makes no sound period and noise. If I disable WiFi and use Ether cable, the noise is gone. If I disable Settings -> Security & Privacy -> Location Services, the noise is gone. Is there any way to receive RTP/UDP package during locationd's scan? My environment: macOS Big Sur ver 11.4 iMac (Retina 5K, 27-inch, 2017) VLC 3.0.16(Intel 64bit)

I wrote simple NSMutableData test project. I profiled with allocations instruments. It shows alloc1() total bytes are 55MB. But alloc1() only called once and alloced byte should be 1MB. I cannot find the reason of 55MB allocation in alloc1() Replace this code with fresh macOS App project on Xcode13. #import "ViewController.h" @implementation ViewController {     NSTimer *mTimer;     NSMutableData *mData1;     NSMutableData *mData2; } - (void)viewDidLoad {     [super viewDidLoad];     mData1 = nil;     mData2 = nil;     mTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self             selector:@selector(timer_cb) userInfo:nil repeats:YES]; } - (void) timer_cb {     if (mData1 == nil) {         [self alloc1];     }     if (mData2 == nil) {         [self alloc2];     }     [self copy1]; } - (void) alloc1 {     NSLog(@"alloc1");     mData1 = [NSMutableData dataWithCapacity:1024*1024]; } - (void) alloc2 {     NSLog(@"alloc2");     mData2 = [NSMutableData dataWithCapacity:1024*1024];     [mData2 resetBytesInRange:NSMakeRange(0, 1024*1024)]; } - (void) copy1 {     [mData1 replaceBytesInRange:NSMakeRange(0, 1024*1024) withBytes:mData2.bytes]; } @end

I have Apple TV 4K connected router A, IP is 192.168.1.10. Apple TV send Bluetooth Low Energy(BLE) advertisement with the IP. I captured by BLE sniffer. I try "Screen Mirroring" from MacBook on router B, IP is 192.168.2.10 MacBook send "GET /info...RTSP/1.0" to appleTV:7000. Apple TV replay with 1368 bytes of "RTSP/1.0 200 OK..." that includes device name, type, features. But MacBook does not show my AppleTV as Display list. I like to know why my AppleTV is not recognized as mirroring display even all RTSP traffic has no error. mDNS from AppleTV is blocked by router. Ping from MacBook to Apple TV was success. If Apple TV and MacBook connect on same router, screen mirroring was success. Router A and B : Netgear Nighthawk Router netmask : 255.255.255.0 (both) MacBook : macOS Monterey 12.4 Apple TV : tvOS 15.6(19M65)

I test with ScreenCaptureKit example and success to get desktop image as IOSurface. I know IOSurface holds GPU memory and not easy to access as DRAM. Do you know a way to h.264 compress the IOSurface? Or do I have to convert to CVPixelBuffer from IOSurface? If you have any sample code for handling IOSurface, it would be useful to me.

I try to run ScreenCaptureKit sample code. That sample require macOS 13.0 for audio capture. When I run, the app shows with "No screen recording permission". I grant Screen Recording permission on System Settings -> Privacy & Security. But same error happens. I cannot find a way to grant the permission. I tried restart app, restart Xcode, reboot macOS and rm -rf ~/Library/Developer/Xcode/DerivedData/CaptureSample-... This sample app worked after comment out "streamConfig.capturesAudio" and related code on Monterey. This permission issue did not happen on Monterey. Env: macOS Ventura 13.0, Xcode 14.1(14B47b) Sample code URL : https://developer.apple.com/documentation/screencapturekit/capturing_screen_content_in_macos?language=objc

I try to get AVCaptureDevice instance of a virtual audio plugin, like blackhole. I need to call AVCaptureDevice.DiscoverySession, because old method (AVCaptureDevice.devicesWithMediaType) is deprecated. First, I cannot find enum for virtual audio plugin. I try .externalUnknown or .builtInMicrophone. Both result is empty. I like to know how to list virtual microphone and get AVCaptureDevice instance. let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(     deviceTypes: [ .externalUnknown ],     mediaType: .audio,     position: .unspecified ) let devs = deviceDiscoverySession.devices print("devices=\(devs)") // empty list

I use VideoToolbox HW h.264 encoder with M1 MacBook for screen mirroring. I need run encoder with minimal delay mode. I use these values as encoderSpecification kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder:true kVTCompressionPropertyKey_ProfileLevel:kVTProfileLevel_H264_Baseline_AutoLevel kVTCompressionPropertyKey_RealTime:true kVTCompressionPropertyKey_AllowFrameReordering:false I set presentation timestamp with current time. In compressed callback, I got encoded frame with wrong order. [13.930533]encode pts=...13.930511 [13.997633]encode pts=...13.997617 [14.013678]compress callback with pts=...13.997617 dts=...13.930511 [14.023443]compress callback with pts=...13.930511 dts=...13.997617 in[]:log time, pts:presentation timestamp, dts:decode timestamp AllowFrameReordering is not working as I expected. If I need to set other property, please let me know. I also does not like buffering 2 video frames. If you know settings for no buffering frame, please let me know.

I need to develop Emergency communication app. This app is not used frequently but it need to start immediately when user need to make emergency communication. If this app is not used for a month, it uninstalled by "Offload unused apps" feature. Is there way to put a flag into app to prevent uninstall? If application's Info.plist has setting like "Preventing offloading unused apps", it would be great to me.

I like to know NullAudio.c is official SDK sample or not. And the reason of enum and UID is defined in NullAudio.c, not defined in SDK header files. I try to use kObjectID_Mute_Output_Master, but it defined different values on each 3rd party plugin. kObjectID_Mute_Output_Master = 10 // NullAudio.c kObjectID_Mute_Output_Master = 9 // https://github.com/ExistentialAudio/BlackHole kObjectID_Mute_Output_Master = 6 // https://github.com/q-p/SoundPusher I can build BlackHole and SoundPusher, these plugin worked. This enum should be defined SDK header and keep same value on each SDK version. I like to know why 3rd party defined different value. If you know the history of NullAudio.c, please let me know.

I had 2 crash report from our customer. Both crash point is same but there is no my code on crash stack trace. How to fix this kind of crash problem. Thread 1 Crashed:: Dispatch queue: com.apple.root.background-qos 0 libsystem_kernel.dylib 0x7ff81b84922a __pthread_kill + 10 1 libsystem_pthread.dylib 0x7ff81b880f7b pthread_kill + 263 2 libsystem_c.dylib 0x7ff81b7caca5 abort + 123 3 libc++abi.dylib 0x7ff81b83b082 abort_message + 241 4 libc++abi.dylib 0x7ff81b82c23d demangling_terminate_handler() + 266 5 libobjc.A.dylib 0x7ff81b529023 _objc_terminate() + 96 6 libc++abi.dylib 0x7ff81b83a4a5 std::__terminate(void (*)()) + 8 7 libc++abi.dylib 0x7ff81b83a456 std::terminate() + 54 8 libdispatch.dylib 0x7ff81b701a58 _dispatch_client_callout + 28 9 libdispatch.dylib 0x7ff81b704500 _dispatch_continuation_pop + 463 10 libdispatch.dylib 0x7ff81b715dff _dispatch_source_invoke + 2184 11 libdispatch.dylib 0x7ff81b7116a2 _dispatch_root_queue_drain + 343 12 libdispatch.dylib 0x7ff81b711e4d _dispatch_worker_thread2 + 160 13 libsystem_pthread.dylib 0x7ff81b87dc9d _pthread_wqthread + 256 14 libsystem_pthread.dylib 0x7ff81b87cc67 start_wqthread + 15 This crash point is exactly same with this post. I do not throw C++ exception. https://developer.apple.com/forums/thread/725197

I got code of CMIO CameraExtension by Xcode target and it is running with FaceTime. I guess this kind of Extension has lots of security limitation. I like to run command like "netstat" in Extension. Is that possible to call Process.run()? I got keep getting error like "The file zsh doesn’t exist". Same code with Process.run() worked in macOS app. I like to run DistributedNotificationCenter and send text from App to CameraExtension. Is that possible? I do not receive any message on CameraExtension. If there is any other IPC method between macOS app and CameraExtension, please let me know.

I need to write macOS App, CameraExtension(CMIO) and Uninstaller app. Bundle ID is like this App : com.my.app CameraExtension : com.my.app.cameraex Uninstaller app : com.my.app.unisntaller My App can activate CameraExtension by OSSystemExtensionRequest.activationRequest. But Uninstaller cannot deactivate CameraExtension. I got error : Error Domain=OSSystemExtensionErrorDomain Code=4 "Extension not found in App bundle: perhaps App is not validly structured" I set AppGroup and add SystemExtension feature and provision for uninstaller. I guess "com.my.app.unisntaller" cannot deactivate "com.my.app.cameraex". What kind of Bundle ID should I use for my uninstaller? Writing App and Uninstaller is correct way for CameraExtension? My manager ask to provide easy method for removing all modules.

When my macOS app try to deactivate CameraExtension, my app's didFailWithError is called with this error. Error Domain=OSSystemExtensionErrorDomain Code=4 "(null)" I cannot search for error code=4 with that domain. MyApp calls OSSystemExtensionManager.shared.submitRequest with OSSystemExtensionRequest.deactivationRequest I did implement these tasks. BundleID, MyApp: com.myapp, BundleID, CameraExtension: com.myapp.camera Added entitlement and App Groups for app and extension MyApp has SystemExtension capability on Xcode and provision MyApp is installed on /Applications/MyAppGroup/MyApp.app MyApp is executed by Finder macOS is Sonoma 14.2.1 (23C71) on M1 MacBook

If I do these tasks on random order, CMIO CameraExtension go into unstable condition. Copy MyApp.app under /Applications or /Applications/MyAppGroup/ Install by MyApp sending OSSystemExtensionRequest.activationRequest Check install condition by command : "systemextensionsctl list" uninstall by MyApp sending OSSystemExtensionRequest.deactivationRequest Remove /Applications/MyAppGroup/ by command line and Finder Remove /Applications/MyApp.app by command line and Finder Kill MyApp.app during activationRequest. Once my CMIO CameraExtension go into unstable condition, it is impossible to remove on normal way. "systemextensionsctl list" shows my extension is activated. Remove by API failed with code=4. Removing file of MyApp.app does not remove CameraExtension Only way to remove CameraExtension is "Boot macOS as recovery mode", disable SIP, "systemextensionsctl uninstall" Audio HAL extension is file based and ATOMIC. I can check file existence by "ls" command and remove by "rm -rf" command. I never met unstable condition.