Re: AVAudioEngine no sound from Mac mini built-in audio devices

Hi,

I've tried to get some audio things going on a new Mac mini 8,1 macOS 10.14.2 (18C54), and ran into an issue where there is no output from the built-in audio devices when using AVAudioEngine.

Xcode prints this while setting up the AVAudioEngine:

[AudioHAL_Client] HALC_ShellDriverPlugIn.cpp:104:Open:  HALC_ShellDriverPlugIn::Open: opening the plug-in failed, Error: 2003329396 (what)

If the built-in speaker or the headphone jack is selected as sound output device, no sound comes out from my AVAudioEngine app.

If I select output via DisplayPort or AirPlay, sound is working, even though above error is also being printed.

Here's repo with an example project: https://github.com/nsdvr/avaudioengine_basic_output

It just plays a .wav file when you press the button. My own project uses a custom AudioUnit generator, and its internalRenderBlock is getting called, so the engine seems to be running fine, there's just silence at the physical outputs.

Relevant setup code:

- (void) setup {
    self.engine = [AVAudioEngine new];
    self.playerNode = [AVAudioPlayerNode new];
    [self.engine attachNode:self.playerNode];
    [self.engine connect:self.playerNode to:self.engine.mainMixerNode format:nil];
    [self.engine prepare];
    NSError *err;
    [self.engine startAndReturnError:&err];
    if(err) {
        NSLog(@"AVAudioEngine start error: %@", err.localizedDescription);
    }
    
    NSError *fileErr;
    NSURL *fileURL = [[NSBundle mainBundle] URLForResource:@"HUUH" withExtension:@"wav"];
    self.audioFile = [[AVAudioFile alloc] initForReading:fileURL error:&fileErr];
    if(fileErr) {
        NSLog(@"error reading audio file");
        return;
    }
    
    [[NSNotificationCenter defaultCenter] addObserver: self
                                             selector: @selector(handleInterruption:)
                                                 name: AVAudioEngineConfigurationChangeNotification
                                               object: self.engine];
}

- (void) play {
    if(!self.audioFile) {
        NSLog(@"Can't play without audio file");
        return;
    }
    
    [self.playerNode scheduleFile:self.audioFile atTime:nil completionHandler:nil];
    [self.playerNode play];
}

Submitted a bug report (46728117)

I'd like to verify if this issue happens on other machines. I don't have this problem on my old Macbook Air.