init isRecording false data Data audioEngine inputNode installTap onBu

init() {
        isRecording = false
        data = Data()
        
        audioEngine.inputNode.installTap(onBus: 0, bufferSize: 4096, format: format) { (buffer, time) in
            // Retrieve audio buffer and append it to saved data
            let channels = UnsafeBufferPointer(start: buffer.int16ChannelData, count: 1)
            let bufferData = NSData(bytes: channels.first, length: Int(buffer.frameCapacity * buffer.format.streamDescription.pointee.mBytesPerFrame)) as Data
            
            if let callback = self.passBufferCallback {
                callback(bufferData)
            }
            
            self.data.append(bufferData)
        }
        
    }

private func startRecording() {
        data.removeAll()
        
        do {
            try audioEngine.start()
            
            DispatchQueue.main.async {
                self.delegate?.recordingStarted()
            }
        }
        catch {
            print("Some troubles with starting engine..")
        }
    }