AVAudioSession endInterruption() returns an NSOSStatusErrorDomain

Question

I'm trying to solve an AVAudioSession problem since many hours ago and didn't get success!!

I found lots of guys talking about problems with endInterruption but none of them talking about this error:

Unable to reactivate the audio session after the interruption ended: Error Domain=NSOSStatusErrorDomain Code=560161140 "The operation couldn’t be completed. (OSStatus error 560161140.)"

I tried converting this code to ASCII to check the Audio Code Results, but there is nothing related to this number.

My code to init the session:

- (void) setupAudioSession {

mySession = [AVAudioSession sharedInstance];
[mySession setDelegate: self];

NSError *audioSessionError = nil;
[mySession setCategory: AVAudioSessionCategoryPlayback error: &audioSessionError];

if (audioSessionError != nil) {
    NSLog (@"Error setting audio session category: %@", [audioSessionError description]);
    return;
}

// Activate the audio session
[mySession setActive: YES error: &audioSessionError];

if (audioSessionError != nil) {
    NSLog (@"Error activating audio session during initial setup: %@", [audioSessionError description]);
    return;
}

// Prepare audio file to play
NSBundle *mainBundle = [NSBundle mainBundle];
NSURL *bgSoundURL = [NSURL fileURLWithPath:[mainBundle pathForResource:@"bg_sound" ofType:@"aif"]];

bgPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:bgSoundURL error:&audioSessionError];
if (!bgPlayer) {
    NSLog(@"No bgPlayer: %@", [audioSessionError description]);  
}

[bgPlayer setNumberOfLoops:-1];
[bgPlayer prepareToPlay];

}

And the code of endInterruption method:

- (void) endInterruptionWithFlags: (NSUInteger) flags {

if (flags & AVAudioSessionInterruptionFlags_ShouldResume) {

    NSError *endInterruptionError = nil;
    [[AVAudioSession sharedInstance] setActive: YES error: &endInterruptionError];
    if (endInterruptionError != nil) {

        NSLog (@"Unable to reactivate the audio session after the interruption ended: %@", [endInterruptionError description]);
        return;

    } else {

        NSLog (@"Audio session reactivated after interruption.");

        if (interruptedWhilePlaying) {

            self.interruptedWhilePlaying = NO;

            // Resume playback by sending a notification to the controller object, which
            //    in turn invokes the playOrStop: toggle method.
            NSString *MixerHostAudioObjectPlaybackStateDidChangeNotification = @"MixerHostAudioObjectPlaybackStateDidChangeNotification";
            [[NSNotificationCenter defaultCenter] postNotificationName: MixerHostAudioObjectPlaybackStateDidChangeNotification object: self]; 

        }
    }
}

}

A big part of this code was extracted from Apple Mixer Host Sample. And it's weird that the sample works fine!

Can you guys figure out what is wrong?

Thanks.

Answer 1

I solved the problem changing the way to design my audio code. Instead of use AVAudioSession and its delegate methods, I change to the C style to work with audio.

I implemented the function:

void interruptionListenerCallback (void *inUserData, UInt32 interruptionState) {}

And it was initialized with:

AudioSessionInitialize (NULL, NULL, interruptionListenerCallback, self);

inside my -(id) init method.

Hope it helps you also. Best.

Answer 2

"If this delegate method receives the AVAudioSessionInterruptionFlags_ShouldResume constant in its flags parameter, the audio session is immediately ready to be used."

You didn't handle the callback correctly. When you receive AVAudioSessionInterruptionFlags_ShouldResume, your audio session is ALREADY ready to use. You need to call setActive when you get a DIFFERENT flag.

Hope it helps...

Answer 3

Using @Trinca answer that what I did on "ARC'ed" project:

AudioSessionInitialize (NULL, NULL, interruptionListenerCallback, (__bridge void *)(self.player));

Were self.player is your player instance that you pass to the callback function.

Then implement the callback:

void interruptionListenerCallback (void *inUserData, UInt32 interruptionState) {
   NSLog(@"itnerp state %li",interruptionState);
   NSLog(@"inUserData %@",inUserData);
   AVAudioPlayer *pl = (__bridge AVAudioPlayer*)inUserData;
   switch (interruptionState) {
    case 0:
        [pl play];
    break;

    case 1:
        [pl pause];
    break;
   }

}

GOOD LUCK

Shani

Answer 4

use audiosession.setmode if it is voip