Unity3D 实现录音小案例

内容简介：Unity3D 实现录音小案例

我们都知道，在Unity中有提供麦克风MicroPhone相关的API，今天小编和大家一起来看一下如何实现录制场景中的声音，并且可以在应用中使用。

1.首先，一起回顾一下快速在游戏中创建音频剪辑，官方文档：https://docs.unity3d.com/ScriptReference/AudioClip.Create.html

1.0 第一步，新建项目并且在场景附加一个TestAudio.cs 组件类；

TestAudio.cs 代码如下：

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

public class TestAudio : MonoBehaviour {
 
        public string Frequency="440";
        public int Samplerate = 44100;
        public int Position = 0;
 
        void OnGUI()
        {
                if (GUI.Button (new Rect (10, 10, 100, 100), "创建音频剪辑"))
                        CreateAudioSource ();
                GUI.Label (new Rect (10, 200, 100, 100),"Position:"+Position.ToString());
        }
         
        void CreateAudioSource()
        {
                AudioClip myClip = AudioClip.Create("MyFirstSound", Samplerate * 2, 1, Samplerate, true, OnAudioRead, OnAudioSetPosition);
                AudioSource aud = GetComponent();
                aud.clip = myClip;
                aud.Play();
        }
 
        void OnAudioRead(float[] data)
        {
                int count = 0;
                while (count < data.Length)
                {
                        data[count] = Mathf.Sign(Mathf.Sin(2 * Mathf.PI * int.Parse(Frequency) * Position / Samplerate));
                        Position++;
                        count++;
                }
        }
 
        void OnAudioSetPosition(int newPosition)
        {
                Position = newPosition;
        }
}

1.1 第二步，直接运行看结果；

2. 然后，一起学习如何在Unity中调用MicroPhone相关的接口，官方文档：https://docs.unity3d.com/ScriptReference/30_search.html?q=Microphone.IsRecording

2.0 第一步，新建项目并且在场景中附加一个MicroPhoneManager.cs 组件类；

MicroPhoneManager.cs  代码如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class MicroPhoneManager : MonoBehaviour {
 
 
        public int DeviceLength;
        public string Frequency="440";
        public int Samplerate = 44100;
        public int MicSecond=2;
        string infoLog="";
 
        AudioSource _curAudioSource;
 
        AudioSource CurAudioSource
        {
                get{
                        if (_curAudioSource == null) {
                                _curAudioSource = gameObject.AddComponent ();
                        }
                        return _curAudioSource;
                }
        }
 
        #region ［public Way］
 
        ///         /// 获取麦克风设备
        ///         public void GetMicrophoneDevice ()
        {
                string[] mDevice = Microphone.devices;
                DeviceLength = mDevice.Length;
                if (DeviceLength == 0)
                        ShowInfoLog ("找不到麦克风设备！");
        }
 
        ///         /// 开始录音
        ///         public void StartRecordAudio ()
        {
                CurAudioSource.Stop ();
                CurAudioSource.loop = false;
                CurAudioSource.mute = true;
                CurAudioSource.clip = Microphone.Start (null, true, MicSecond, int.Parse (Frequency));
                while (!(Microphone.GetPosition (null) > 0)) {
                         
                }
                CurAudioSource.Play ();
                ShowInfoLog ("开始录音.....");
        }
 
        ///         /// 停止录音
        ///         public void StopRecordAudio ()
        {
                ShowInfoLog ("结束录音.....");
                if (!Microphone.IsRecording (null))
                        return;
                Microphone.End (null);
                CurAudioSource.Stop ();
                 
        }
 
        ///         /// 回放录音
        ///         public void PlayRecordAudio ()
        {
                if (Microphone.IsRecording (null))
                        return;
                if (CurAudioSource.clip == null)
                        return;
                CurAudioSource.mute = false;
                CurAudioSource.loop = false;
                CurAudioSource.Play ();
                ShowInfoLog ("播放录音.....");
        }
 
        ///         ///  打印录音信息
        ///         public void PrintRecordData ()
        {
                if (Microphone.IsRecording (null))
                  return;
                byte[] data = GetClipData ();
                string infoLog = "total length:" + data.Length + " time:" + CurAudioSource.time; 
                ShowInfoLog (infoLog); 
        }
 
        ///         /// 获取音频数据
        ///         /// The clip data.        public  byte[] GetClipData ()
        {
                if (CurAudioSource.clip == null) {
                        ShowInfoLog ("缺少音频资源！");
                        return null;
                }
 
                float[] samples = new float[CurAudioSource.clip.samples];
                CurAudioSource.clip.GetData (samples, 0);
 
                byte[] outData = new byte[samples.Length * 2];
                int reScaleFactor = 32767;
 
                for (int i = 0; i < samples.Length; i++) {
                        short tempShort = (short)(samples [i] * reScaleFactor);
                        byte[] tempData = System.BitConverter.GetBytes (tempShort);
 
                        outData [i * 2] = tempData [0];
                        outData [i * 2 + 1] = tempData [1];
                }
                if (outData == null || outData.Length 0)
                { 
                        GUILayout.Label("录音频率:"); 
                        Frequency = GUILayout.TextField(Frequency, GUILayout.Width(Screen.width / 5), GUILayout.Height(Screen.height / 20)); 
                        GUILayout.BeginVertical(); 
 
                        if (ShowGUIButton("开始录音")) 
                        { 
                                StartRecordAudio ();
                        }
                        if (ShowGUIButton("结束录音")) 
                        { 
                                StopRecordAudio ();
                        } 
                        if (ShowGUIButton("回放录音")) 
                        { 
                                PlayRecordAudio ();
                        }
                        if (ShowGUIButton("获取录音数据")) 
                        { 
                                PrintRecordData ();
                        }
                                 
                        GUILayout.EndVertical(); 
                } 
                GUILayout.Label(infoLog); 
 
        }
 
        #region [Private Way]
 
        ///         /// 显示GUI 按钮
        ///         /// true, if GUI button was shown, false otherwise.        /// Button name.        bool ShowGUIButton (string buttonName)
        {
                return  GUILayout.Button (buttonName, GUILayout.Height (Screen.height / 20), GUILayout.Width (Screen.width / 5));
        }
 
        void ShowInfoLog (string info)
        {
                infoLog += info;
                infoLog += "\r\n";
        }
 
        #endregion
 
}
}

2.1 第二步，我们可以部署到android／iphone真机上运行，当然也可以直接在PC端运行查看结果；

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