Unity Microphone 无限时长录制

原创文章：转载请标明出处--博客园 Jason_c

Unity可以很方便的通过 Microphone.Start（）方法来调用麦克风，但是有一个弊端是，必须传入时长，这就很尴尬了，因为大多数时间，我们是不知道用户需要何时关闭麦克风的，

这里提供一个解决思路：

1、将microphone设置为循环录制，即：

Microphone.Start(micName, true,2,16000);  

　　

2、每隔一定间隔读取录制好的数据，并将它缓存起来。

这里值得一提的是，如果每隔2秒保存一下音频数据（因为我设置的录制时间是2秒），

因为代码运行也需要时间，会导致音频数据损坏，声音会出现明显的断层现象，所以这里将它分段保存就能解决这种问题，

当麦克风录制的位置大于音频的一半的时候，保存上一段音频，当麦克风录制完时，保存后一段音频。

 　　　　bool isSaveFirstHalf = true;//将音频从中间分生两段，然后分段保存
        int micPosition;
        while (!isMicRecordFinished)
        {
            if (isSaveFirstHalf)
            {
                yield return new WaitUntil(() => { micPosition = Microphone.GetPosition(micName);return micPosition > length * 6 / 10 && micPosition < length; });//保存前半段
                micDataTemp = new float[length / 2];
                micClip.GetData(micDataTemp, 0);
                micDataList.AddRange(micDataTemp);
                isSaveFirstHalf = !isSaveFirstHalf;
            }
            else
            {
                yield return new WaitUntil(() => { micPosition = Microphone.GetPosition(micName); return micPosition > length / 10 && micPosition < length / 2; });//保存后半段
                micDataTemp = new float[length/2];
                micClip.GetData(micDataTemp, length / 2);
                micDataList.AddRange(micDataTemp);
                isSaveFirstHalf = !isSaveFirstHalf;
            }

        }

最后处理一下结束时的音频

 　　　　micPosition = Microphone.GetPosition(micName);
        if (micPosition <= length)//前半段
        {
            micDataTemp = new float[micPosition/2];
            micClip.GetData(micDataTemp, 0);
        }
        else
        {
            micDataTemp = new float[micPosition - length/2];
            micClip.GetData(micDataTemp, length/2);
        }

　　

3、最后通过保存的数据生成新的音频，即：

AudioClip.Create("RecordClip", micDataList.Count, 1, 16000, false);

newAudioClip.SetData(micDataList.ToArray(), 0);

完整代码如下：

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

public class MicUnlimitedDuration : MonoBehaviour {
    public delegate void AudioRecordHandle(AudioClip audioClip);
    public AudioSource audioSource;

    AudioClip micClip;


    bool isMicRecordFinished= true;

    List<float> micDataList = new List<float>();
    float[] micDataTemp;

    string micName;

    public void StartMicrophone() {
        StopCoroutine(StartMicrophone(null, PlayAudioRecord));
        StartCoroutine(StartMicrophone(null, PlayAudioRecord));
    }


    IEnumerator StartMicrophone(string microphoneName,AudioRecordHandle  audioRecordFinishedEvent) {
        Debug.Log("Start Mic");
        micDataList = new List<float>();
        micName = microphoneName;
        micClip = Microphone.Start(micName, true,2,16000);
        isMicRecordFinished = false;
        int length = micClip.channels * micClip.samples;
        bool isSaveFirstHalf = true;//将音频从中间分生两段，然后分段保存
        int micPosition;
        while (!isMicRecordFinished)
        {
            if (isSaveFirstHalf)
            {
                yield return new WaitUntil(() => { micPosition = Microphone.GetPosition(micName);return micPosition > length * 6 / 10 && micPosition < length; });//保存前半段
                micDataTemp = new float[length / 2];
                micClip.GetData(micDataTemp, 0);
                micDataList.AddRange(micDataTemp);
                isSaveFirstHalf = !isSaveFirstHalf;
            }
            else
            {
                yield return new WaitUntil(() => { micPosition = Microphone.GetPosition(micName); return micPosition > length / 10 && micPosition < length / 2; });//保存后半段
                micDataTemp = new float[length/2];
                micClip.GetData(micDataTemp, length / 2);
                micDataList.AddRange(micDataTemp);
                isSaveFirstHalf = !isSaveFirstHalf;
            }

        }
        micPosition = Microphone.GetPosition(micName);
        if (micPosition <= length)//前半段
        {
            micDataTemp = new float[micPosition/2];
            micClip.GetData(micDataTemp, 0);
        }
        else
        {
            micDataTemp = new float[micPosition - length/2];
            micClip.GetData(micDataTemp, length/2);
        }
        micDataList.AddRange(micDataTemp);
        Microphone.End(micName);
        AudioClip newAudioClip = AudioClip.Create("RecordClip", micDataList.Count, 1, 16000, false);
        newAudioClip.SetData(micDataList.ToArray(), 0);
        audioRecordFinishedEvent(newAudioClip);
        Debug.Log("RecordEnd");
    }



    public void StopMicrophone()
    {
        Debug.Log("Stop mic");
        isMicRecordFinished = true;
    }

    void PlayAudioRecord(AudioClip newAudioClip)
    {
        audioSource.clip = newAudioClip;
        audioSource.Play();
    }
}

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