Random AVAudioEngine crash

No messages of any sort in the system log?

-DS

Not sure how to check for "messages in the system log" but I am seeing this as part of the crash log. Does this help?

Fatal Exception: com.apple.coreaudio.avfaudio

error 561017449

Well, that translates to AVAudioSessionErrorInsufficientPriority (AVAudioSession.h) but it shouldn't lead to a crash.

Can you please file a bug for this crasher and attach a test case that reproduces the issue.

thank you.

Hello, I've the same issue.

App records and trim audio like this:

NSString *trimmedAudioFilePath = [SSTalkingManager stringPathFile];//[NSString stringWithFormat:@"%@/%@.wav", DOCUMENTS_FOLDER, kFileName];

NSFileManager *fileManager = [NSFileManager defaultManager];

if ([fileManager fileExistsAtPath:trimmedAudioFilePath]) {

NSError *error;

if ([fileManager removeItemAtPath:trimmedAudioFilePath error:&error] == NO) {

NSLog(@"removeItemAtPath %@ error:%@", trimmedAudioFilePath, error);

}

}

NSLog(@"Saving to %@", trimmedAudioFilePath);

AVAsset *avAsset = [AVAsset assetWithURL:self.audioRecorder.url];

NSArray *tracks = [avAsset tracksWithMediaType:AVMediaTypeAudio];

AVAssetTrack *track = [tracks objectAtIndex:0];

AVAssetExportSession *exportSession = [AVAssetExportSession

exportSessionWithAsset:avAsset

presetName:AVAssetExportPresetAppleM4A];

/

CMTime startTime = CMTimeMake(self.recordingBeginTime*SAVING_SAMPLES_PER_SECOND, SAVING_SAMPLES_PER_SECOND);

CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, kCMTimePositiveInfinity);

/

AVMutableAudioMix *exportAudioMix = [AVMutableAudioMix audioMix];

AVMutableAudioMixInputParameters *exportAudioMixInputParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track];

exportAudioMix.inputParameters = [NSArray arrayWithObject:exportAudioMixInputParameters];

/

exportSession.outputURL = [NSURL fileURLWithPath:trimmedAudioFilePath];

exportSession.outputFileType = AVFileTypeAppleM4A;

exportSession.timeRange = exportTimeRange;

exportSession.audioMix = exportAudioMix;

/

dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);

[exportSession exportAsynchronouslyWithCompletionHandler:^{

dispatch_semaphore_signal(semaphore);

}];

dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);

if (AVAssetExportSessionStatusCompleted == exportSession.status) {

NSLog(@"AVAssetExportSessionStatusCompleted");

return trimmedAudioFilePath;

} else if (AVAssetExportSessionStatusFailed == exportSession.status) {

/

/

/

NSLog(@"AVAssetExportSessionStatusFailed %@", exportSession.error.localizedDescription);

} else {

NSLog(@"Export Session Status: %d", exportSession.status);

}

return nil;

After that I add some filter like this:

- (void)startPlayingWithComplete:(void(^)())comlpeteHandler {

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker error: nil];

/

engine = [[AVAudioEngine alloc] init];

playerNode = [[AVAudioPlayerNode alloc] init];

[engine attachNode:playerNode];

if ([[NSFileManager defaultManager] fileExistsAtPath:[SSTalkingManager stringPathFile]]) {

AVAudioFile *file = [[AVAudioFile alloc] initForReading:[SSTalkingManager urlVoiceFile] error:nil];

[engine connect:playerNode to:engine.mainMixerNode format:file.processingFormat];

AVAudioFrameCount capacity= (AVAudioFrameCount)file.length;

AVAudioPCMBuffer *buffer = [[AVAudioPCMBuffer alloc] initWithPCMFormat:file.processingFormat frameCapacity:capacity];

[file readIntoBuffer:buffer error:nil];

AVAudioUnitTimePitch *timePitch = [[AVAudioUnitTimePitch alloc] init];

timePitch.pitch = _pitch;

timePitch.rate = _rate;

[engine attachNode:timePitch];

[engine connect:playerNode to:timePitch format:nil];

[engine connect:timePitch to:engine.outputNode format:nil];

[playerNode scheduleFile:file atTime:nil completionHandler:comlpeteHandler];

NSError * err;

[engine startAndReturnError:&err]; //<--------- This I have a crash. "Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'error -10868'"

[playerNode play];

}

}

But, if I trim .wav file in Mac and upload to my app in bundle resources then all are OK.

Could you help me?

What I should do in short: I should record voice when user speaks after that I should add some effects to it and then I shoud play effected sound.

Best regards, Andrei.

I am not an expert in AVAudioEngine (still learning) but an observation based on your comment regarding trimming .wav file. In your code you use AVAssetExportSession to export an m4a audio file. If it works when you upload a .wav file from your Mac; then maybe it is the different audio encoding that is causing the problem?

The -10868 error is kAudioUnitErr_FormatNotSupported. Since you have a file that works and a file that doesn't (the one from your Mac and the one exported via AVAssetExportSession), use afinfo and dump the file info for both to see what (if any) the difference are - next I'd dump info from the fileFormat and processingFormat for each case. Should all be the same right since the initForReading method states that it will opens the file for reading using the standard format (deinterleaved floating point) which is the format that the engine should use.

So long answer shortened, you should be able to create a test case where your short piece of player code works once (good file) but then fails the second time (bad file) and it will be obvious what the failure is or you'll have a great bug report you can submit.

Hi, I just noticed that I'm getting a lot of crashes on my app (crashes captured by App Store Connect) when some users (it happens randomly and I wasn't able to replicate) are trying to leave comments into a TextView using AVAudioEngine. I managed to download the crash log from AppStore and I will post it bellow.

Date/Time:           2022-02-25 15:34:02.4994 +0000
Launch Time:         2022-02-25 15:23:54.4546 +0000
OS Version:          iPhone OS 15.3.1 (19D52)
Release Type:        User
Baseband Version:    2.23.02
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  0

Last Exception Backtrace:
0   CoreFoundation                	0x1809510fc __exceptionPreprocess + 220 (NSException.m:200)
1   libobjc.A.dylib               	0x1991a1d64 objc_exception_throw + 60 (objc-exception.mm:565)
2   CoreFoundation                	0x180a275c0 +[NSException raise:format:arguments:] + 100 (NSException.m:147)
3   AVFAudio                      	0x1f3a7961c AVAE_RaiseException(NSString*, ...) + 60 (AVAEInternal.h:69)
4   AVFAudio                      	0x1f3ae5b4c AUGraphNodeBaseV3::CreateRecordingTap(unsigned long, unsigned int, AVAudioFormat*, void (AVAudioPCMBuffer*, AVAudioTime*) block_pointer) + 776 (AVAEInternal.h:77)
5   AVFAudio                      	0x1f3acbf14 AVAudioEngineGraph::InstallTapOnNode(AVAudioNode*, unsigned long, unsigned int, AVAudioFormat*, void (AVAudioPCMBuffer*, AVAudioTime*) block_pointer) + 988 (AVAudioEngineGraph.mm:2029)
6   AVFAudio                      	0x1f3b4f7f8 AVAudioEngineImpl::InstallTapOnNode(AVAudioNode*, unsigned long, unsigned int, AVAudioFormat*, void (AVAudioPCMBuffer*, AVAudioTime*) block_pointer) + 300 (AVAudioEngine.mm:1337)
7   AVFAudio                      	0x1f3b32918 -[AVAudioNode installTapOnBus:bufferSize:format:block:] + 572 (AVAudioNode.mm:185)
8                         	                 0x100a472b4 InspectionCommentsVC.startRecording() + 1608 (InspectionCommentsVC.swift:275)
9                         	                 0x100a48120 specialized InspectionCommentsVC.startStopMicrophoneBtn(_:) + 256 (InspectionCommentsVC.swift:195)
10                        	                 0x100a468bc startStopMicrophoneBtn + 4 (<compiler-generated>:0)
11                        	                 0x100a468bc @objc InspectionCommentsVC.startStopMicrophoneBtn(_:) + 48
12  UIKitCore                     	0x183229a98 -[UIApplication sendAction:to:from:forEvent:] + 100 (UIApplication.m:5361)
13  UIKitCore                     	0x183355db8 -[UIControl sendAction:to:forEvent:] + 128 (UIControl.m:871)
14  UIKitCore                     	0x1830d0f90 -[UIControl _sendActionsForEvents:withEvent:] + 352 (UIControl.m:942)
15  UIKitCore                     	0x18316d864 -[UIButton _sendActionsForEvents:withEvent:] + 160 (UIButton.m:4142)
16  UIKitCore                     	0x183400b40 -[UIControl touchesEnded:withEvent:] + 536 (UIControl.m:637)
17  UIKitCore                     	0x182ed358c -[UIWindow _sendTouchesForEvent:] + 980 (UIWindow.m:2974)
18  UIKitCore                     	0x182f04f48 -[UIWindow sendEvent:] + 4456 (UIWindow.m:3274)
19  UIKitCore                     	0x1830b4e34 -[UIApplication sendEvent:] + 828 (UIApplication.m:11877)
20  UIKitCore                     	0x182ed8140 __dispatchPreprocessedEventFromEventQueue + 7904 (UIEventDispatcher.m:2290)
21  UIKitCore                     	0x182eccf2c __processEventQueue + 6760 (UIEventDispatcher.m:2597)
22  UIKitCore                     	0x183d13d54 updateCycleEntry + 176 (UIEventDispatcher.m:102)
23  UIKitCore                     	0x18353eb44 _UIUpdateSequenceRun + 84 (_UIUpdateSequence.mm:112)
24  UIKitCore                     	0x183bbb84c schedulerStepScheduledMainSection + 144 (_UIUpdateCycleScheduler.m:1174)
25  UIKitCore                     	0x183bbae3c runloopSourceCallback + 60 (_UIUpdateCycleScheduler.m:1262)
26  CoreFoundation                	0x1809730d0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1972)
27  CoreFoundation                	0x180983d90 __CFRunLoopDoSource0 + 208 (CFRunLoop.c:2016)
28  CoreFoundation                	0x1808be098 __CFRunLoopDoSources0 + 268 (CFRunLoop.c:2053)
29  CoreFoundation                	0x1808c38a4 __CFRunLoopRun + 820 (CFRunLoop.c:2951)
30  CoreFoundation                	0x1808d7468 CFRunLoopRunSpecific + 600 (CFRunLoop.c:3268)
31  GraphicsServices              	0x19c47b38c GSEventRunModal + 164 (GSEvent.c:2200)
32  UIKitCore                     	0x18327a5d0 -[UIApplication _run] + 1100 (UIApplication.m:3493)
33  UIKitCore                     	0x182ff8f74 UIApplicationMain + 364 (UIApplication.m:5047)

Thanks for reading this !

Kind regards, Flo