Recording only incoming input microphone while players are running.

Hi all,

I'm playing lots of audio files with AVAudioPlayerNode. While the players are running I start recording.

But recording file mixing all of the audio incoming players+microphone input. I want to isolated input stream,i want to record only mic input.

Is it possible to record only incoming built in microphone when built speaker is running?

How can i isolated input from mic and players output?

My sample code block:

_engine = [[AVAudioEngine alloc] init];

_inputNode= _engine.inputNode;

_outputNode = _engine.outputNode;

_recordingMixer = [[AVAudioMixerNode alloc] init];

[_engine attachNode:_player];

[_engine attachNode:_player1];

[_engine attachNode:_player2];

AVAudioFormat *stereoFormat = [amenFile processingFormat];

AVAudioFormat *stereoFormat1 = [bassFile processingFormat];

AVAudioFormat *stereoFormat2 = [pianoFile processingFormat];

NSDictionary *recordSettings = [NSDictionary dictionaryWithObjectsAndKeys:

[NSNumber numberWithInt: kAudioFormatMPEG4AAC], AVFormatIDKey,

[NSNumber numberWithFloat:44100.0], AVSampleRateKey,

[NSNumber numberWithInt: 2], AVNumberOfChannelsKey,

nil];

_recordingFormat = [[AVAudioFormat alloc] initWithSettings:recordSettings];

AVAudioMixerNode *mainMixer = [_engine mainMixerNode];

/

[_engine connect:_player to:mainMixer format:stereoFormat];

[_engine connect:_player1 to:mainMixer format:stereoFormat1];

[_engine connect:_player2 to:mainMixer format:stereoFormat2];

NSError *error;

if (!_mixerOutputFileURL) _mixerOutputFileURL = [NSURL URLWithString:[NSTemporaryDirectory() stringByAppendingString:@"mixerOutput.m4a"]];

AVAudioMixerNode *mainMixer = [_engine mainMixerNode];

AVAudioFile *mixerOutputFile = [[AVAudioFile alloc] initForWriting:_mixerOutputFileURL settings:_recordingFormat.settings error:&error];

NSAssert(mixerOutputFile != nil, @"mixerOutputFile is nil, %@", [error localizedDescription]);

[_inputNode installTapOnBus: 0 bufferSize:4096 format:[_inputNode inputFormatForBus:0] block:^(AVAudioPCMBuffer *bufferTwo, AVAudioTime *when) {

NSError *error;

NSAssert([mixerOutputFile writeFromBuffer:bufferTwo error:&error], @"error writing buffer two data to file, %@", [error localizedDescription]);

}];

[self startEngine];

_isRecording = YES;