record input coming from bluetooth headset in iPhone

Question

I have a project in which I have to record the voice coming from bluetooth headset and play with default iPhone speaker. I have searched a lot and got this code.

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Answer 1

add the audio session to your code

// create and set up the audio session
    AVAudioSession* audioSession = [AVAudioSession sharedInstance];
    [audioSession setDelegate:self];
    [audioSession setCategory:AVAudioSessionCategoryRecord error:nil];
    [audioSession setActive:YES error:nil];

Answer 2

i just review your issue and got nice answer something you want try with Bellow code:-

// create and set up the audio session
    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;
    OSStatus stat = AudioSessionSetProperty (
                             kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,
                             sizeof (allowBluetoothInput),
                             &allowBluetoothInput
                            );
    NSLog(@"status = %x", stat);    // 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);    
    // if bluetooth headset connected, should be "HeadsetBT"
    // if not connected, will be "ReceiverAndMicrophone"

    // now, play a quick sound we put in the bundle (bomb.wav)
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef        soundFileURLRef;
    SystemSoundID   soundFileObject;
    soundFileURLRef  = CFBundleCopyResourceURL (mainBundle,CFSTR ("bomb"),CFSTR ("wav"),NULL);

    NSError *error = nil;

    audioRecorder = [[AVAudioRecorder alloc]
                     initWithURL:soundFileURLRef
                     settings:recordSettings
                     error:&error];
    if (error)
    {
        NSLog(@"error: %@", [error localizedDescription]);
    } else {
        [audioRecorder prepareToRecord];
    }

Credit goes to This

Answer 3

Try out this amazing piece of code. Will work for sure

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
NSError *err = nil;
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionAllowBluetooth  error:NULL];
[audioSession setActive:YES error:NULL];

NSString *preferredPortType = AVAudioSessionPortBluetoothHFP;
for (AVAudioSessionPortDescription *desc in audioSession.availableInputs)
{
    if ([desc.portType isEqualToString: preferredPortType])
    {
        [audioSession setPreferredInput:desc error:nil];
    }
}