AVplayer Audio routing to speakers and headphones - objective-c

Question

i am trying to route the audio to headphone when headphone is plugged in and and play it via iPhone speakers when there is no headphones connected.
i have tried the the following
AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, audioRouteChangeListenerCallback, nil);
void audioRouteChangeListenerCallback (
void *inUserData,
AudioSessionPropertyID inPropertyID,
UInt32 inPropertyValueSize,
const void *inPropertyValue
) {
DetailViewController *controller = (__bridge_transfer DetailViewController *) inUserData;
if (inPropertyID != kAudioSessionProperty_AudioRouteChange) return;
CFDictionaryRef routeChangeDictionary = (CFDictionaryRef)inPropertyValue;
CFNumberRef routeChangeReasonRef = (CFNumberRef)CFDictionaryGetValue (routeChangeDictionary, CFSTR (kAudioSession_AudioRouteChangeKey_Reason) );
SInt32 routeChangeReason;
CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);
if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {
NSLog(#"UnPlugged");
[controller headphoneIsPlugged];
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute, sizeof (audioRouteOverride),&audioRouteOverride);
} else if (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable) {
NSLog(#"Plugged in");
}
}
the function headphone is not being called at all. the program is not even going to that part of the section.
now when i plug out the headphone the audio just stops and nothing its not being played via the speaker.
inside the audiolister i tried to put the following
[controller.avplayer play];
but still nothing is happening.
Please help

Answer 1

You need to pass the instance of DetailViewController when you are adding the listener. This will be passed in as user data. Without this (__bridge_transfer DetailViewController *) inUserData; would return nil.
Your code would be something like this if you call it from within your DetailViewController:
AudioSessionAddPropertyListener (
kAudioSessionProperty_AudioRouteChange,
audioRouteChangeListenerCallback,
(__bridge void *)(self)
);