unity example added (thanks to johannes hucek)

examples/unity/iem/Assets/MicInput.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+
+
+public class MicInput : MonoBehaviour {
+
+    //output mic loudness
+    public float MicLoudness;
+    float MicLoudnessInDB;
+    public float maxMicInputVolume;
+    public float objectScaleMin;
+    public float objectScaleMax;
+
+    private Vector3 scale;
+
+    //if you have more then one microphone attached
+    private string _device;
+
+    //AudioClip to temporary store our microphone input
+    AudioClip _clipRecord;
+    // samplerate of the audioclip
+    private int samplerate = 44100;
+
+
+    int _sampleWindow = 128;
+
+    //is the microphone initialized
+    bool _isInitialized;
+
+
+    void Update() {
+        // levelMax equals to the highest normalized value power 2, a small number because < 1
+        MicLoudnessInDB = LinearToDecibel(LevelMax());
+        MicLoudness = LevelMax();
+
+        //scale gameobject
+        float scaleValue = map(MicLoudness, 0, maxMicInputVolume, objectScaleMin, objectScaleMax);
+        scale.x = scaleValue;
+        scale.y = scaleValue;
+        scale.z = scaleValue;
+        gameObject.transform.localScale = scale;
+
+    }
+
+    //mic initialization and start recording
+    void InitMic() {
+        //use the first microphone connected
+        if (_device == null)
+            _device = Microphone.devices[0];
+
+        //start recording 999 seconds
+        _clipRecord = Microphone.Start(_device, true, 999, 44100);
+    }
+
+    void StopMicrophone() {
+        Microphone.End(_device);
+    }
+
+    //get data from microphone into audioclip and returns the volume
+    float LevelMax() {
+        float levelMax = 0;
+        float average = 0;
+        float[] waveData = new float[_sampleWindow];
+        int micPosition = Microphone.GetPosition(null) - (_sampleWindow + 1); // null means the first microphone
+
+        if (micPosition < 0)
+            return 0;
+
+        _clipRecord.GetData(waveData, micPosition);
+
+        // Getting a peak on the last 128 samples
+        // Getting average on the last 128 samples
+        for (int i = 0; i < _sampleWindow; i++) {
+            float wavePeak = waveData[i] * waveData[i];
+            if (levelMax < wavePeak) {
+                levelMax = wavePeak;
+            }
+            average += waveData[i] * waveData[i];
+        }
+        //return average / _sampleWindow;
+        return levelMax;
+
+    }
+
+    //convert from linear input to decibel
+    private float LinearToDecibel(float linear) {
+        float dB;
+
+        //linear != 0: epsilon comparison
+        if (linear >= Double.Epsilon)
+            dB = 20.0f * Mathf.Log10(linear);
+        else
+            dB = -144.0f;
+
+        return dB;
+    }
+
+    float map(float value, float istart, float iend, float ostart, float oend) {
+        return ostart + (oend - ostart) * ((value - istart) / (iend - istart));
+    }
+
+    // start mic when scene starts
+    void OnEnable() {
+        InitMic();
+        _isInitialized = true;
+    }
+
+    //stop mic when loading a new level or quit application
+    void OnDisable() {
+        StopMicrophone();
+    }
+
+    void OnDestroy() {
+        StopMicrophone();
+    }
+
+
+    // make sure the mic gets started & stopped when application gets focused
+    void OnApplicationFocus(bool focus) {
+        if (focus) {
+
+            if (!_isInitialized) {
+                InitMic();
+                _isInitialized = true;
+            }
+        }
+        if (!focus) {
+            StopMicrophone();
+            _isInitialized = false;
+
+        }
+    }
+}

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