How to add multiple audio input (CMSampleBuffer) to haishinkit using swift?

Question

I want to add internal and mic audio at same time while streaming to youtube using haishinkit. I am getting noisy beeps sound only while streaming.

code used

In case of RPSampleBufferType.audioMic: and RPSampleBufferType.audioApp, I am doing following code to append the sampleBuffer to RTMPBroadcaster class object.

if CMSampleBufferDataIsReady(sampleBuffer) 
{
   broadcaster.appendSampleBuffer(sampleBuffer, withType: .audio)
}