如何檢查在iOS通話期間音頻是否路由至藍牙免提？

Question

我要檢測的下面的事件時，有從iOS裝置的任何呼入/呼出：

1. 無論任何藍牙耳機裝置被連接。
2. 音頻是否路由到任何藍牙耳機設備。

我是新來的藍牙配件編程，有沒有辦法做到這一點？

Answer 1

我解決了它下面給出：

AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
    NSError *err; 

    // close down our current session... 
    [audioSession setActive:NO error:nil]; 
    AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, &AudioSessionManager_audioRouteChangedListener, self); 


    void AudioSessionManager_audioRouteChangedListener (void *inClientData, AudioSessionPropertyID inID, UInt32 inDataSize, const void *inData) 
    { 
     NSLog(@"AudioSessionManager_audioRouteChangedListener"); 
     MyAppDelegate *instance = (MyAppDelegate *)inClientData; 
     CFDictionaryRef routeChangeDictionary = inData; 


     // extract the route change reason... 

     CFNumberRef routeChangeReasonRef = CFDictionaryGetValue (routeChangeDictionary, CFSTR(kAudioSession_AudioRouteChangeKey_Reason)); 
     SInt32 routeChangeReason = kAudioSessionRouteChangeReason_Unknown; 
     if (routeChangeReasonRef) 
      CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason); 

     // extract the old route.. 

     CFStringRef newRoute; 
     if ([[[UIDevice currentDevice] systemVersion] doubleValue] >= 5.0) 
     { 
      newRoute = CFDictionaryGetValue(routeChangeDictionary, @"OutputDeviceDidChange_NewRoute"); 
     } 
     else 
     { 
      newRoute = CFDictionaryGetValue(routeChangeDictionary, @"OutputDeviceDidChange_NewRoute"); 
     } 


     CFStringRef oldRoute; 
     oldRoute = CFDictionaryGetValue(routeChangeDictionary, @"OutputDeviceDidChange_OldRoute"); 
     NSLog(@"newRouteString:%@ oldRoute:%@",newRoute,oldRoute); 

     [instance onAudioRouteChangedWithReason:routeChangeReason newRoute:(NSString *)newRoute oldRoute:(NSString *)oldRoute]; 
    } 

Answer 2

在下面的代碼中，檢查「micConnected」的值以查看是否連接了耳機。

AudioSessionInitialize(NULL, NULL, NULL, NULL);  
UInt32 propertySize, micConnected; 
    AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &propertySize, &micConnected);