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,,);

        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 *  /  && micPosition < length; });//保存前半段

                micDataTemp = new float[length / ];

                micClip.GetData(micDataTemp, );

                micDataList.AddRange(micDataTemp);

                isSaveFirstHalf = !isSaveFirstHalf;

            }

            else

            {

                yield return new WaitUntil(() => { micPosition = Microphone.GetPosition(micName); return micPosition > length /  && micPosition < length / ; });//保存后半段

                micDataTemp = new float[length/];

                micClip.GetData(micDataTemp, length / );

                micDataList.AddRange(micDataTemp);

                isSaveFirstHalf = !isSaveFirstHalf;

            }

        }

        micPosition = Microphone.GetPosition(micName);

        if (micPosition <= length)//前半段

        {

            micDataTemp = new float[micPosition/];

            micClip.GetData(micDataTemp, );

        }

        else

        {

            micDataTemp = new float[micPosition - length/];

            micClip.GetData(micDataTemp, length/);

        }

        micDataList.AddRange(micDataTemp);

        Microphone.End(micName);

        AudioClip newAudioClip = AudioClip.Create("RecordClip", micDataList.Count, , , false);

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

        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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