是否可以同时录制蓝牙耳机的语音并在iPhone扬声器上播放？

Question

我正在制作一款应用，需要录制来自蓝牙耳机的声音并在iPhone扬声器上播放（而不是在蓝牙耳机扬声器上播放）。我试过了：

AVAudioSession* audioSession = [AVAudioSession sharedInstance];
[audioSession setDelegate:self];
[audioSession setCategory: AVAudioSessionCategoryPlayAndRecord error: nil];
[audioSession setActive: YES error: nil];


// set up for bluetooth microphone input
UInt32 allowBluetoothInput = 1;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,sizeof (allowBluetoothInput),&allowBluetoothInput);
// problem if this is not zero

// check the audio route
UInt32 size = sizeof(CFStringRef);
CFStringRef route;
OSStatus result = AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &size, &route);
NSLog(@"route = %@", route);

之后我想将音乐文件播放到iPhone扬声器，我使用了代码：

- (IBAction)playAudio:(id)sender {
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
    AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);

    UInt32 size = sizeof(CFStringRef);
    CFStringRef route;
    OSStatus result = AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &size, &route);
    NSLog(@"route = %@", route);


    // NSLog(@"route = %@", route);
    //[self playAudiokam];

    if (!_audioRecorder.recording)
    {
        NSError *error;

        _audioPlayer = [[AVAudioPlayer alloc]
                        initWithContentsOfURL:_audioRecorder.url
                        error:&error];

        _audioPlayer.delegate = self;

        if (error)
            NSLog(@"Error: %@",
                  [error localizedDescription]);
        else
            [_audioPlayer play];
    }
}

此处我的代码正常运行，但同时。应用需要扬声器继续播放音乐并从蓝牙耳机录制语音。