Ios 使用蓝牙设备在AVCaptureSession中录制音频

我正在使用苹果的RosyWriter来录制视频和音频。现在我需要使用蓝牙耳机录制音频，但它不适合我。我正在为此做以下工作

 captureSession = [[AVCaptureSession alloc] init];
   /*
 * Create audio connection
 */
if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")){
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionAllowBluetooth error:nil];
    captureSession.usesApplicationAudioSession = true;
    captureSession.automaticallyConfiguresApplicationAudioSession = true;

}
AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
//    AVCaptureDeviceInput *audioIn = [[AVCaptureDeviceInput alloc] initWithDevice:[self audioDevice] error:nil];
AVCaptureDeviceInput *audioIn = [[AVCaptureDeviceInput alloc] initWithDevice:audioDevice error:nil];

if ([captureSession canAddInput:audioIn])
    [captureSession addInput:audioIn];

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我也遵循了这一点

我可以通过如下更改音频输出设置来做到这一点

_audioCompressionSettings = [[audioOut recommendedAudioSettingsForAssetWriterWithOutputFileType:AVFileTypeQuickTimeMovie] copy];

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我可以通过如下更改音频输出设置来做到这一点

_audioCompressionSettings = [[audioOut recommendedAudioSettingsForAssetWriterWithOutputFileType:AVFileTypeQuickTimeMovie] copy];