[IOS]AudioCaptureCrash (AudioCaptureAudioUnit) 4.27 source

Development Platform & Builds Mobile
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1

I made a game with a pawn that uses AudioCapture
Android: Everythink ok
Windows Everything OK
IOS: AudioCapture always capture 0 data and when you change scene or close the app, it crashes all . If i load the pawn with the Audio CaptureComponent and i capture nothing, just stay there and then change level, or exit app, the game crash anyways.
any solution? according to UE4 git source ios should be supported using AudioCaptureAudioUnit
Search · AudioCaptureAudioUnit (github.com)

My app is requesting permissions with plist and making a function call (the prompt window appears at the beginning), but just the presence of the component makes everthing collapses

2

any help with this? i need to solve it for my job

3

Did you solve this? I’m running in to a similar issue

4

i had to create my own solution using IOS native code

5

Thanks for the reply.
If you don’t mind sharing, which Apple API did use? The higher level AVAudioSession, so you recorded to a file, or did you use AudioUnits to get the buffer data? Any tips?

6

i used AVAudioSession. first i created a small project for ios in Xcode and tested the recording. Then when it work, i move the code as plugin for UE4
somehing like this


@implementation FIosVoiceRecorder
@synthesize recorder,recorderSettings,recorderFilePath,fileUrl;
@synthesize audioPlayer,audioFileName, filePath;

- (instancetype)init
 {
     self = [super init];
     
     return self;
 }
#pragma mark - Audio Recording
- (void)startRecording
{
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    NSError *err = nil;
    [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
    if(err)
    {
        NSLog(@"audioSession: %@ %ld %@", [err domain], (long)[err code], [[err userInfo] description]);
        return;
    }
    [audioSession setActive:YES error:&err];
    err = nil;
    if(err)
    {
        NSLog(@"audioSession: %@ %ld %@", [err domain], (long)[err code], [[err userInfo] description]);
        return;
    }
    NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
     NSString *docsDir = [dirPaths objectAtIndex:0];
     fileUrl = [NSURL fileURLWithPath:[docsDir stringByAppendingPathComponent:@"Mustakistmp.m4a"]];
   
   // NSURL *tmpFileUrl = [[NSURL alloc] initFileURLWithPath:filePath];
    //fileUrl = [[NSURL alloc] initFileURLWithPath:filePath];

    NSDictionary *recordSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                            [NSNumber numberWithInt: kAudioFormatMPEG4AAC], AVFormatIDKey,
                            [NSNumber numberWithFloat:16000.0], AVSampleRateKey,
                            [NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
                            nil];
    
     
    
     err = nil;
    recorder = [[ AVAudioRecorder alloc] initWithURL:fileUrl settings:recordSettings error:&err];
    if(!recorder){
        NSLog(@"recorder: %@ %ld %@", [err domain], (long)[err code], [[err userInfo] description]);
        
        return;
    }
    
    //prepare to record
    [recorder setDelegate:self];
    [recorder prepareToRecord];
    recorder.meteringEnabled = YES;
    
    BOOL audioHWAvailable = audioSession.isInputAvailable;
    if (! audioHWAvailable) {
        NSLog(@"Audio input hardware not available");
     
        return;
    }
    
    // start recording
    [recorder recordForDuration:(NSTimeInterval) 60];//Maximum recording time : 60 seconds default
   
    NSLog (@"Recroding Started: %@ ",fileUrl.absoluteString);

}

- (void)stopRecording
{
    [recorder stop];
    NSLog(@"Recording Stopped");
}
#pragma mark - Audio Playing
- (void)startPlaying
{
    NSLog(@"playRecording");
        
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
        
        NSError *error;
        audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:&error];
        audioPlayer.numberOfLoops = 0;
        [audioPlayer play];
        NSLog(@"playing");
}

this is not the complete code so it won’t correctly but i hope you get the idea.

7

Yes that makes sense, thank you!

8

No problem