AVAudioEngine crash in iOS14.

Version 12.0 beta (12A6159)
iOS14
Simulator

<pre>

  • (void)startAudioEngine {

  NSError *error = nil;
  if (!self.audioEngine.isRunning) {
    self.audioEngine = [[AVAudioEngine alloc] init];
    AVAudioInputNode *inputNode = self.audioEngine.inputNode;
    AVAudioFormat *nativeAudioFormat = [inputNode inputFormatForBus:0];
    _weak typeof(self)weakSelf = self;
    [inputNode installTapOnBus:0 bufferSize:1024 format:nativeAudioFormat block:^(AVAudioPCMBuffer * Nonnull buffer, AVAudioTime * _Nonnull when) {
      [weakSelf.recognitionRequest appendAudioPCMBuffer:buffer];
    }];
    [self.audioEngine prepare];
    [self.audioEngine startAndReturnError:&error];
    if (error) {
      [self stop];
      [self onError:[NSError errorWithDomain:@"startAudioEngine error" code:0 userInfo:nil]];
    }
    else {
      [self activeStatusChanged:MMSpeechRecognizerActiveStatusStared];
    }
  }
  else {
    [self stop];
    [NSError errorWithDomain:@"The audio engine is runing" code:0 userInfo:nil];
  }
}
</pre>

Crashed at self.audioEngine.inputNode line.
Up vote post of Mengxiang Down vote post of Mengxiang
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Posted by
Mengxiang
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I'm also having a problem with AVAudioEngine, but is when I call the prepare method. It works fine in iOS 13 simulator, but crashes in iOS 14.

This is the error I got:

AQDefaultDevice (1): output stream 0: null buffer
EXCEPTION thrown (-50): error != 0
AQDefaultDevice (1): output stream 0: null buffer
Initialize: Mach message timeout. Apparently deadlocked. Aborting now.
Posted by
macbieoo
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The error log:

Code Block 
[plugin] AddInstanceForFactory: No factory registered for id <CFUUID 0x6000032144c0> F8BB1C28-BAE8-11D6-9C31-00039315CD46
HALB_IOBufferManager_Client::GetIOBuffer: the stream index is out of range
HALB_IOBufferManager_Client::GetIOBuffer: the stream index is out of range
[aqme] 255: AQDefaultDevice (1): output stream 0: null buffer
[aqme] 1778: EXCEPTION thrown (-50): error != 0
 Initialize: Mach message timeout. Apparently deadlocked. Aborting now.
CoreSimulator 725.10 - Device: iPhone 11 (003A9CF3-FDD7-4C44-8607-CAB3FDBB904B) - Runtime: iOS 14.0 (18A5301v) - DeviceType: iPhone 11


Code Block 
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
  frame #0: 0x00007fff215a233a libsystem_kernel.dylib`pthread_kill + 10
  frame #1: 0x00007fff215d7e60 libsystem_pthread.dylib`pthread_kill + 430
  frame #2: 0x00007fff200c7c24 libsystem_c.dylib`abort + 120
  frame #3: 0x00000001082ce5c9 AudioToolboxCore`_ReportRPCTimeout(char const*, int) + 90
  frame #4: 0x0000000130cffbd9 libEmbeddedSystemAUs.dylib`_CheckRPCError(char const*, int, int) + 92
  frame #5: 0x0000000130cfc4e0 libEmbeddedSystemAUs.dylib`AURemoteIO::Initialize() + 1878
  frame #6: 0x0000000130d15ec6 libEmbeddedSystemAUs.dylib`AUBase::DoInitialize() + 36
  frame #7: 0x0000000130c9c47f libEmbeddedSystemAUs.dylib`AUMethodInitialize(void*) + 59
  frame #8: 0x00000001083c31bb AudioToolboxCore`-[AUAudioUnitV2Bridge allocateRenderResourcesAndReturnError:] + 77
  frame #9: 0x0000000105aa0dbf AVFAudio`AUInterfaceBaseV3::Initialize() + 45
  frame #10: 0x0000000105a8b90f AVFAudio`AVAudioIONodeImpl::GetInputFormat(unsigned long) + 125
  frame #11: 0x0000000105a8b5d3 AVFAudio`AVAudioIONodeImpl::SetOutputFormat(unsigned long, AVAudioFormat*) + 571
  frame #12: 0x0000000105a86022 AVFAudio`-[AVAudioNode setOutputFormat:forBus:] + 70
  frame #13: 0x0000000105a9d1e3 AVFAudio`AVAudioEngineImpl::UpdateInputNode(bool) + 921
  frame #14: 0x0000000105a98fd8 AVFAudio`-[AVAudioEngine inputNode] + 88
 * frame #15: 0x0000000102c64391 iOS14Demo`-[MMSpeechRecognizer startAudioEngine](self=0x0000600002777c40, _cmd="startAudioEngine") at MMSpeechRecognizer.m:72:56
  frame #16: 0x0000000102c651fd iOS14Demo`-[MMSpeechRecognizer start](self=0x0000600002777c40, _cmd="start") at MMSpeechRecognizer.m:175:13
  frame #17: 0x0000000102c63929 iOS14Demo`-[ViewController siriBtnClick:](self=0x00007f8dda60b650, _cmd="siriBtnClick:", sender=0x00007f8ddb80b3a0) at ViewController.m:66:9
  frame #18: 0x0000000114403f15 UIKitCore`-[UIApplication sendAction:to:from:forEvent:] + 83
  frame #19: 0x0000000113d5da2a UIKitCore`-[UIControl sendAction:to:forEvent:] + 223
  frame #20: 0x0000000113d5dd4d UIKitCore`-[UIControl _sendActionsForEvents:withEvent:] + 332
  frame #21: 0x0000000113d5c636 UIKitCore`-[UIControl touchesEnded:withEvent:] + 500
  frame #22: 0x000000011443f389 UIKitCore`-[UIWindow _sendTouchesForEvent:] + 1287
  frame #23: 0x00000001144411ea UIKitCore`-[UIWindow sendEvent:] + 4750
  frame #24: 0x000000011441b39d UIKitCore`-[UIApplication sendEvent:] + 428
  frame #25: 0x00000001144aabb1 UIKitCore`processEventQueue + 14793
  frame #26: 0x00000001144a175f UIKitCore`eventFetcherSourceCallback + 106
  frame #27: 0x00000001034f18bc CoreFoundation`CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17
  frame #28: 0x00000001034f17fb CoreFoundation`CFRunLoopDoSource0 + 157
  frame #29: 0x00000001034f0f3f CoreFoundation`CFRunLoopDoSources0 + 222
  frame #30: 0x00000001034eba20 CoreFoundation`CFRunLoopRun + 882
  frame #31: 0x00000001034eb2fa CoreFoundation`CFRunLoopRunSpecific + 538
  frame #32: 0x00000001081ebdb3 GraphicsServices`GSEventRunModal + 139
  frame #33: 0x00000001143fd942 UIKitCore`-[UIApplication _run] + 912
  frame #34: 0x0000000114402f62 UIKitCore`UIApplicationMain + 1570
  frame #35: 0x0000000102c660ca iOS14Demo`main(argc=1, argv=0x00007ffeecf9bc80) at main.m:17:12
  frame #36: 0x00007fff20222941 libdyld.dylib`start + 1
(lldb) 

Posted by
Mengxiang
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Hello everyone,

This is an iOS system bug with Apple.

The problem has been resolved by Apple.
Appears in Version 12.0 beta (12A6159).
Resolved in Version 12.0 beta 2 (12A6163b) by Apple.

Next: Update Xcode and test again.

Thanks.
Posted by
Mengxiang
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Is it working for you guys in beta 4 of Xcode?
Posted by
macbieoo
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Still crashing for me (on Simulator)
Posted by
PrinceCreed
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I also encountered this problem, in xcode12 beta3 and beta4
Posted by
Tank_Liu
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Problem solved in Xcode 12 beta 5.
Posted by
PrinceCreed
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is there any solution to this problem ?
Posted by
NayyerAli
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