Unity3d中MicroPhone的使用

Note：这种方法只用于学习，没有任何实际意义。

如果需要实现录音，可以使用原生的接口，Android就去找Android，IOS就去找IOS。最方便的方式是接入语音SDK，比如百度语音SDK。

目标实现录音功能、保存为wav、播放、保存为int16[]发送网络数据流、接收Int16[]播放数据流

MicroPhoneInput类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using UnityEngine;
using System.Collections;

[RequireComponent (typeof(AudioSource))]
public class MicroPhoneInput : MonoBehaviour 
{

    private static MicroPhoneInput m_instance;

    public float sensitivity=100;
    public float loudness=0;

    private static string[] micArray=null;

    const int HEADER_SIZE = 44;

    const int RECORD_TIME = 10;

    // Use this for initialization
    void Start () {
    }

    public static MicroPhoneInput getInstance()
    {
        if (m_instance == null) 
        {
            micArray = Microphone.devices;
            if (micArray.Length == 0)
            {
                Debug.LogError ("Microphone.devices is null");
            }
            foreach (string deviceStr in Microphone.devices)
            {
                Debug.Log("device name = " + deviceStr);
            }
            if(micArray.Length==0)
            {
                Debug.LogError("no mic device");
            }

            GameObject MicObj=new GameObject("MicObj");
            m_instance= MicObj.AddComponent();
        }
        return m_instance;
    }

    public void StartRecord()
    {
        audio.Stop();
        if (micArray.Length == 0)
        {
            Debug.Log("No Record Device!");
            return;
        }
        audio.loop = false;
        audio.mute = true;
        audio.clip = Microphone.Start(null, false, RECORD_TIME, 44100); //22050 
        while (!(Microphone.GetPosition(null)>0)) {
        }
        audio.Play ();
        Debug.Log("StartRecord");
        //倒计时
        StartCoroutine(TimeDown());
       
    }

    public  void StopRecord()
    {
        if (micArray.Length == 0)
        {
            Debug.Log("No Record Device!");
            return;
        }
        if (!Microphone.IsRecording(null))
        {
            return;
        }
        Microphone.End (null);
        audio.Stop();

        Debug.Log("StopRecord");

    }

    public Byte[] GetClipData()
    {
        if (audio.clip == null)
        {
            Debug.Log("GetClipData audio.clip is null");
            return null; 
        }

        float[] samples = new float[audio.clip.samples];

        audio.clip.GetData(samples, 0);


        Byte[] outData = new byte[samples.Length * 2];
        //Int16[] intData = new Int16[samples.Length];
        //converting in 2 float[] steps to Int16[], //then Int16[] to Byte[]

        int rescaleFactor = 32767; //to convert float to Int16

        for (int i = 0; i < samples.Length; i++)
        {
            short temshort = (short)(samples[i] * rescaleFactor);

            Byte[] temdata=System.BitConverter.GetBytes(temshort);

            outData[i*2]=temdata[0];
            outData[i*2+1]=temdata[1];


        }
        if (outData == null || outData.Length <= 0)
        {
            Debug.Log("GetClipData intData is null");
            return null; 
        }
        //return intData;
        return outData;
    }
    public void PlayClipData(Int16[] intArr)
    {

        string aaastr = intArr.ToString();
        long  aaalength=aaastr.Length;
        Debug.LogError("aaalength=" + aaalength);

        string aaastr1 = Convert.ToString (intArr);
        aaalength = aaastr1.Length;
        Debug.LogError("aaalength=" + aaalength);

        if (intArr.Length == 0)
        {
            Debug.Log("get intarr clipdata is null");
            return;
        }
        //从Int16[]到float[]
        float[] samples = new float[intArr.Length];
        int rescaleFactor = 32767;
        for (int i = 0; i < intArr.Length; i++)
        {
            samples[i] = (float)intArr[i] / rescaleFactor;
        }
        
        //从float[]到Clip
        AudioSource audioSource = this.GetComponent();
        if (audioSource.clip == null)
        {
            audioSource.clip = AudioClip.Create("playRecordClip", intArr.Length, 1, 44100, false, false);
        }
        audioSource.clip.SetData(samples, 0);
        audioSource.mute = false;
        audioSource.Play();
    }
    public void PlayRecord()
    {
        if (audio.clip == null)
        {
            Debug.Log("audio.clip=null");
            return;
        }
        audio.mute = false;
        audio.loop = false;
        audio.Play ();
        Debug.Log("PlayRecord");

    }



    public  float GetAveragedVolume()
    {
        float[] data=new float[256];
        float a=0;
        audio.GetOutputData(data,0);
        foreach(float s in data)
        {
            a+=Mathf.Abs(s);
        }
        return a/256;
    }
    
    // Update is called once per frame
    void Update ()
    {
        loudness = GetAveragedVolume () * sensitivity;
        if (loudness > 1) 
        {
            Debug.Log("loudness = "+loudness);
        }
    }

    private IEnumerator TimeDown()
    {
        Debug.Log(" IEnumerator TimeDown()");

        int time = 0;
        while (time < RECORD_TIME)
        {
            if (!Microphone.IsRecording (null)) 
            { //如果没有录制
                Debug.Log ("IsRecording false");
                yield break;
            }
            Debug.Log("yield return new WaitForSeconds "+time);
            yield return new WaitForSeconds(1);
            time++;
        }
        if (time >= 10)
        {
            Debug.Log("RECORD_TIME is out! stop record!");
            StopRecord();
        }
        yield return 0;
    }
}

创建一个脚本来使用

using UnityEngine;
using System.Collections;

public class NewBehaviourScript : MonoBehaviour {

	// Use this for initialization
	void Start () 
    {
	    
	}

    void OnGUI()
    {
        if(GUILayout.Button("Record"))
        {
            MicroPhoneInput.getInstance().StartRecord();
        }
        if(GUILayout.Button("Play"))
        {
            MicroPhoneInput.getInstance().PlayRecord();
        }
    }
	
	// Update is called once per frame
	void Update () {
	
	}
}

运行后，点击 Record 按钮来录制，10s后停止，就可以点击 Play 来播放了。

示例工程下载

http://pan.baidu.com/s/1c0rTL0