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POUsing kAudioSessionProperty_OtherMixableAudioShouldDuck on iPhone
 

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    <p>I'm trying to get consistant behavior out of the kAudioSessionProperty_OtherMixableAudioShouldDuck property on the iPhone to allow iPod music blending and I'm having trouble. At the start of my app I set an Ambient category like so:</p> <pre><code>-(void) initialize { [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil]; } </code></pre> <p>Later on when I attempt to play audio I set the duck property using the following method:</p> <pre><code>//this will crossfade the audio with the ipod music - (void) toggleCrossfadeOn:(UInt32)onOff { //crossfade the ipod music AudioSessionSetProperty(kAudioSessionProperty_OtherMixableAudioShouldDuck,sizeof(onOff),&amp;onOff); AudioSessionSetActive(onOff); } </code></pre> <p>I call this passing a numeric "1" just before playing audio like so:</p> <pre><code> [self toggleCrossfadeOn:1]; [player play]; </code></pre> <p>I then call the crossfade method again passing a zero when my app's audio completes using a playback is stopping callback like so:</p> <pre><code>-(void) playbackIsStoppingForPlayer:(MQAudioPlayer*)audioPlayer { NSLog(@"Releasing player"); [audioPlayer release]; [self toggleCrossfadeOn:0]; } </code></pre> <p>In my production app this exact code works as expected, causing the ipod to fade out just before playing my app's audio then fade back in when the audio finishes playing. In a new project I recently started, I get different behavior. The iPod audio fades down and never fades back in. In my production app I use the AVAudioPlayer where in my new app I've written a custom audio player that uses audio queues. Could somebody help me understand the differences and how to properly use this API?</p>
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