I posted about this on Stack Overflow but have done some reading since and
still can't get rid of this crash. Original Question.
<http://stackoverflow.com/questions/35421190/changing-setpreferrediobufferduration-at-runtime-results-in-core-audio-error-50>
I'm writing a waveform display for iOS 9.2. At the moment, a very simple
app that renders red lines from left to right for each frame buffer. If
the frame buffer is 1024 frames per render callback than I make use of most
pixels on my iphone6+ but I can set it to 16 frames per buffer and each
line is draw 1080pixels/16 points apart. (the waveform's are displayed over
the portrait axis on the left side). Thats the idea.
So I can launch the app and if I specify any initial preferred buffer
duration (for example. 0.0001) everything works. But trying to switch
dynamically from my UI at runtime results in the -50 crash at the
AudioUnitRender() call in my remoteIO's input callback. I have read the
AudioSession programming guide for AVFoundation from Apple's online
documentation and cannot figure out what to do.
I've tried re-activating the audioSession in the NSNotification Callback
like this:
//////////////////////////////// handle Change of preferredBufferDuration
/////
- (void)handleRouteChange:(NSNotification *)notification {
NSError *audioSessionError = nil;
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setActive:YES error:&audioSessionError];
if (audioSessionError) {
NSLog(@"Error %ld, %@",
(long)audioSessionError.code,
audioSessionError.localizedDescription);
}
CheckError(AudioOutputUnitStart(self.remoteIOUnit), "stop unit in mode");
}
////////////// end
(I actually stop RemoteIO from running because AVAudioSession want's no
running I/O when you disable it) But this results in an infinite loop,
because changing the AudioSession actually triggers another
"handleRouteChanged:" notification.
I'm sure there is some regular way to deal with changing audioSession
parameters on the fly with regards to I/O AudioUnits.
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