AudioSessionInitialize (NULL,                            // 1NULL,                            // 2interruptionListenerCallback,    // 3userData                         // 4
);

void interruptionListenerCallback ( void *inUserData,  UInt32  interruptionState ) {AudioViewController *controller = (AudioViewController *)inUserData;  if (interruptionState == kAudioSessionBeginInterruption) {         if (controller.audioRecorder) {[controller recordOrStop: (id) controller];                 } else if (controller.audioPlayer) {[controller pausePlayback];                                controller.interruptedOnPlayback = YES;                     }} else if ((interruptionState == kAudioSessionEndInterruption) && controller.interruptedOnPlayback) {[controller resumePlayback];controller.interruptedOnPlayback = NO;}
}

- (void) beginInterruption {if (playing) {playing = NO;interruptedWhilePlaying = YES;[self updateUserInterface];}
}
NSError *activationError = nil;
- (void) endInterruption {if (interruptedWhilePlaying) {BOOL success = [[AVAudioSession sharedInstance] setActive: YES error: &activationError];if (!success) { /* handle the error in activationError */ }[player play];playing = YES;interruptedWhilePlaying = NO;[self updateUserInterface];}
}

   AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange,audioRouteChangeListenerCallback,nil);

void audioRouteChangeListenerCallback(void *inUserData, AudioSessionPropertyID inPropertyID, UInt32 inPropertyValueSize, const void *inPropertyValue) {if (inPropertyID != kAudioSessionProperty_AudioRouteChange)return;CFDictionaryRef routeChangeDictionary = inPropertyValue;CFNumberRef routeChangeReasonRef = CFDictionaryGetValue (routeChangeDictionary, CFSTR(kAudioSession_AudioRouteChangeKey_Reason));CFStringRef oldRouteRef = CFDictionaryGetValue (routeChangeDictionary,CFSTR (kAudioSession_AudioRouteChangeKey_OldRoute));NSString *oldRouteString = (NSString *)oldRouteRef;SInt32 routeChangeReason;CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable) {if (oldRouteStringplaying ) { //需判断不可用Route为耳机时playing = NO;interruptedWhilePlaying = NO;  //清除中断标识，如电话中拔掉耳机挂断时，不需要继续播放
        }}
}

/* Known values of route:
*"Headset"
* "Headphone"
* "Speaker"
* "SpeakerAndMicrophone"
* "HeadphonesAndMicrophone"
* "HeadsetInOut"
* "ReceiverAndMicrophone"
* "Lineout"
*///ios5以后可使用的一些类型
const CFStringRef kAudioSessionOutputRoute_LineOut;
const CFStringRef kAudioSessionOutputRoute_Headphones;
const CFStringRef kAudioSessionOutputRoute_BluetoothHFP;
const CFStringRef kAudioSessionOutputRoute_BluetoothA2DP;
const CFStringRef kAudioSessionOutputRoute_BuiltInReceiver;
const CFStringRef kAudioSessionOutputRoute_BuiltInSpeaker;
const CFStringRef kAudioSessionOutputRoute_USBAudio;
const CFStringRef kAudioSessionOutputRoute_HDMI;
const CFStringRef kAudioSessionOutputRoute_AirPlay;