How to properly handle audio interruptions?

Question

I've created a OpenGL 3D game utilizing OpenAL for audio playback and experienceing a problem of losing audio if "Home" button is getting pressed before audio device is getting initialized. I tried to hook up to audio session interrupt handler, but my callback is never getting called. No matter if I minimize or maximize my application. My "OpenALInterruptionListener" is never getting called.

What am I doing wrong?

AudioSessionInitialize(NULL, NULL, OpenALInterriptionListener, this);

void OpenALInterriptionListener(void * inClientData, UInt32 inInterruptionState)
{
    OpenALDevice * device = (OpenALDevice *) inClientData;

    if (inInterruptionState == kAudioSessionBeginInterruption)
    {
          alcSuspendContext(_context);
          alcMakeContextCurrent(_context);
          AudioSessionSetActive(false);
    }
    else if (inInterruptionState == kAudioSessionEndInterruption)
    {
          UInt32 sessionCategory = kAudioSessionCategory_AmbientSound;
          AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);
          AudioSessionSetActive(true);    
          alcMakeContextCurrent(_context);
          alcProcessContext(_context);
    }
}

score 2 · Answer 1 · answered Jun 05 '12 at 19:30

2

Please note that there are currently issues with Audio Interruptions and IOS. Interruption notifications are fine, but end Audio Interruptions Notifications do not always work. There is a bug into Apple on this and they have not responded.

answered Jun 05 '12 at 19:30

ort11

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score 1 · Accepted Answer · answered May 28 '12 at 03:21

Try using NULL in alcMakeContextCurrent()

void OpenALInterriptionListener(void *inClientData, UInt32 inInterruptionState)
{
    OpenALDevice * device = (OpenALDevice *) inClientData;
    OSStatus nResult;

    if( inInterruptionState == kAudioSessionBeginInterruption )
    {
        alcMakeContextCurrent(NULL);    
    }
    else if( inInterruptionState == kAudioSessionEndInterruption )
    {
        nResult = AudioSessionSetActive(true);

        if( nResult )
        {
            //  "Error setting audio session active"
        }

        alcMakeContextCurrent( device->GetContext() );
    }
}

[http://benbritten.com/2009/02/02/restarting-openal-after-application-interruption-on-the-iphone/](http://benbritten.com/2009/02/02/restarting-openal-after-application-interruption-on-the-iphone/) — james82345, May 28 '12 at 03:24

How to properly handle audio interruptions?

2 Answers2

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