microphoneCapture.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent (typeof (AudioSource))]  

public class microphoneCapture : MonoBehaviour {

	//A boolean that flags whether there's a connected microphone  
	private bool micConnected = false;  

	//The maximum and minimum available recording frequencies  
	private int minFreq;  
	private int maxFreq;  

	//A handle to the attached AudioSource  
	private AudioSource goAudioSource;  

	//Use this for initialization  
	void Start()   
	{  
		//Check if there is at least one microphone connected  
		if(Microphone.devices.Length <= 0)  
		{  
			//Throw a warning message at the console if there isn't  
			Debug.LogWarning("Microphone not connected!");  
		}  
		else //At least one microphone is present  
		{  
			//Set 'micConnected' to true  
			micConnected = true;  

			//Get the default microphone recording capabilities  
			Microphone.GetDeviceCaps(null, out minFreq, out maxFreq);  

			//According to the documentation, if minFreq and maxFreq are zero, the microphone supports any frequency...  
			if(minFreq == 0 && maxFreq == 0)  
			{  
				//...meaning 44100 Hz can be used as the recording sampling rate  
				maxFreq = 44100;  
			}  

			//Get the attached AudioSource component  
			goAudioSource = this.GetComponent<AudioSource>();  
		}  
			
	}

	void OnGUI()   
	{  
		//If there is a microphone  
		if(micConnected)  
		{  
			//If the audio from any microphone isn't being captured  
			if(!Microphone.IsRecording(null))  
			{  
				//Case the 'Record' button gets pressed  
				if(GUI.Button(new Rect(Screen.width/2-100, Screen.height/2-25, 200, 50), "Record"))  
				{  
					//Start recording and store the audio captured from the microphone at the AudioClip in the AudioSource  
					goAudioSource.clip = Microphone.Start(null, true, 20, maxFreq);  
				}  
			}  
			else //Recording is in progress  
			{  
				//Case the 'Stop and Play' button gets pressed  
				if(GUI.Button(new Rect(Screen.width/2-100, Screen.height/2-25, 200, 50), "Stop and Play!"))  
				{  
					Microphone.End(null); //Stop the audio recording  
					goAudioSource.Play(); //Playback the recorded audio  
				}  

				GUI.Label(new Rect(Screen.width/2-100, Screen.height/2+25, 200, 50), "Recording in progress...");  
			}  
		}  
		else // No microphone  
		{  
			//Print a red "Microphone not connected!" message at the center of the screen  
			GUI.contentColor = Color.red;  
			GUI.Label(new Rect(Screen.width/2-100, Screen.height/2-25, 200, 50), "Microphone not connected!");  
		}  

	}  

}