kAudioSessionOverrideAudioRoute_Speaker issue - iphone

Question

i need to trigger the iphone audio route back and forth from speaker to normal mode very quickly. I've created an audio Session similar to this site:
http://atastypixel.com/blog/using-remoteio-audio-unit/
Im creating a app that can do VOIP.
So let me explain the simple issue i have. I have a button that toggles from speaker to normal mode like this:
if(speakerState){
value = kAudioSessionOverrideAudioRoute_None;
error = AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(value), &value);
speakerState = false;
}
else {
value = kAudioSessionOverrideAudioRoute_Speaker;
error = AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(value), &value);
speakerState = true;
}
... you get the idea just toggling the speaker on and off.
Here is the issue: When the end user RAPIDLY hits the button to toggle the speaker after about 10 presses the application freezes for a while as if its releasing something and after 30 seconds comes back. I need the end user to be able to constantly tap this button on/off as much as they want.
update: I tried calling the speakers in the background thread but still if i press the speakers too many times it freezes or i loose audio here is the code:
-(void) manageSpeakerState{
OSStatus error;
UInt32 value;
if(speakerState){
value = kAudioSessionOverrideAudioRoute_None;
error = AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(value), &value);
speakerBtn.selected = false;
speakerState = false;
}
else {
value = kAudioSessionOverrideAudioRoute_Speaker;
error = AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(value), &value);
speakerBtn.selected = true;
speakerState = true;
}
}
// this gets called whenever the speaker button is pressed ..it toggles the speakers on/off
-(IBAction) speaker
{
[self performSelectorInBackground:#selector(manageSpeakerState) withObject:nil ];
}
UPDATE: My audio session is running on a seperate thread using pthread and its in a .c file. It could be a concurrency issue as it seems when the main thread gets tied up this issue occurs. How can i update the audio route on the thread that the audio session is running on ?
UPDATE: i have the same issue as this: http://lists.apple.com/archives/coreaudio-api/2012/Jul/msg00129.html
Whenever i change routes (ie. speaker or headphone) my audioUnits are paused so im reading empty stuff into the buffers. Its almost like a hardware manufacturer issue. How can i get around this ? the call backs are still being called but theres no audio unit while switching routes.

Answer 1

On button click just change button's background image and tag.Change audio session property in background thread.

Answer 2

In your application delegate just add this piece of code..I hope it work fine.
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
UIBackgroundTaskIdentifier newTaskId = UIBackgroundTaskInvalid;
newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];