Unity录音并且保存文件（去掉录音无效片段）

将以下代码复制，挂在场景中（也可以将此脚本写成不继承mono的单例）

开始录音方法StartRecord。

停止录音方法StopRecord，参数为要保存的文件名，这里将文件保存到Application.persistentDataPath路径下

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;
using System.IO;/// <summary>
/// unity录音的clip直接转byte系统无法正确生成音频文件,而且时间是定死的
/// 所以基本逻辑是:停止录音时,通过一定方法把有效byte转成可以生成的音频文件,再用www加载,传服务器
/// </summary>
public class MicphoneRecord : MonoBehaviour
{AudioSource _audio;AudioSource audio{get{if (_audio == null){_audio = gameObject.AddComponent<AudioSource>();}return _audio;}}void Start(){string[] ms = Microphone.devices;deviceCount = ms.Length;if (deviceCount == 0){Debug.Log("no microphone found");}}const int HEADER_SIZE = 44;const int RECORD_TIME = 30;int deviceCount;string bitrate = "128";const int frequency = 44100;private string path_1;public void StartRecord(){audio.Stop();audio.loop = false;audio.mute = true;audio.clip = Microphone.Start(null, false, RECORD_TIME, frequency);while (!(Microphone.GetPosition(null) > 0)){}audio.Play();}public void StopRecord(string path){if (!Microphone.IsRecording(null)){return;}Microphone.End(null);audio.Stop();//string path = "64_3_1.wav";audio.clip = GetTransformAudioClip(audio.clip, 0);SaveMusic(path);HttpHelper.Instance.UpLoadRecordClip(path);}public void PlayRecord(){if (Microphone.IsRecording(null)){return;}if (audio.clip == null){return;}audio.mute = false;audio.loop = false;audio.Play();}public void SaveMusic(string filename){Save(filename, audio.clip);}public static bool Save(string filename, AudioClip clip){//if (!filename.ToLower().EndsWith(".wav"))//{//    filename = ".wav";//}if (!filename.EndsWith(".wav")){filename = ".wav";}#if UNITY_IPHONE
//      path_1 = Application.persistentDataPath;  string filepath = Path.Combine(Application.persistentDataPath, filename);
#endif#if UNITY_STANDALONE_WINstring filepath =  filename;
#endif
#if UNITY_ANDROIDstring filepath = Path.Combine(Application.persistentDataPath, filename);
#endif//      string filepath = Path.Combine(Application.persistentDataPath, filename);  Debug.Log(filepath);// Make sure directory exists if user is saving to sub dir.  Directory.CreateDirectory(Path.GetDirectoryName(filepath));using (FileStream fileStream = CreateEmpty(filepath)){ConvertAndWrite(fileStream, clip);WriteHeader(fileStream, clip);}return true; // TODO: return false if there's a failure saving the file  }static FileStream CreateEmpty(string filepath){FileStream fileStream = new FileStream(filepath, FileMode.Create);byte emptyByte = new byte();for (int i = 0; i < HEADER_SIZE; i++) //preparing the header  {fileStream.WriteByte(emptyByte);}return fileStream;}static void ConvertAndWrite(FileStream fileStream, AudioClip clip){float[] samples = new float[clip.samples];clip.GetData(samples, 0);Int16[] intData = new Int16[samples.Length];//converting in 2 float[] steps to Int16[], //then Int16[] to Byte[]  Byte[] bytesData = new Byte[samples.Length * 2];//bytesData array is twice the size of  //dataSource array because a float converted in Int16 is 2 bytes.  int rescaleFactor = 32767; //to convert float to Int16  for (int i = 0; i < samples.Length; i++){intData[i] = (short)(samples[i] * rescaleFactor);Byte[] byteArr = new Byte[2];byteArr = BitConverter.GetBytes(intData[i]);byteArr.CopyTo(bytesData, i * 2);}fileStream.Write(bytesData, 0, bytesData.Length);}static void WriteHeader(FileStream fileStream, AudioClip clip){int hz = clip.frequency;int channels = clip.channels;int samples = clip.samples;fileStream.Seek(0, SeekOrigin.Begin);Byte[] riff = System.Text.Encoding.UTF8.GetBytes("RIFF");fileStream.Write(riff, 0, 4);Byte[] chunkSize = BitConverter.GetBytes(fileStream.Length - 8);fileStream.Write(chunkSize, 0, 4);Byte[] wave = System.Text.Encoding.UTF8.GetBytes("WAVE");fileStream.Write(wave, 0, 4);Byte[] fmt = System.Text.Encoding.UTF8.GetBytes("fmt ");fileStream.Write(fmt, 0, 4);Byte[] subChunk1 = BitConverter.GetBytes(16);fileStream.Write(subChunk1, 0, 4);UInt16 two = 2;UInt16 one = 1;Byte[] audioFormat = BitConverter.GetBytes(one);fileStream.Write(audioFormat, 0, 2);Byte[] numChannels = BitConverter.GetBytes(channels);fileStream.Write(numChannels, 0, 2);Byte[] sampleRate = BitConverter.GetBytes(hz);fileStream.Write(sampleRate, 0, 4);Byte[] byteRate = BitConverter.GetBytes(hz * channels * 2); // sampleRate * bytesPerSample*number of channels, here 44100*2*2  fileStream.Write(byteRate, 0, 4);UInt16 blockAlign = (ushort)(channels * 2);fileStream.Write(BitConverter.GetBytes(blockAlign), 0, 2);UInt16 bps = 16;Byte[] bitsPerSample = BitConverter.GetBytes(bps);fileStream.Write(bitsPerSample, 0, 2);Byte[] datastring = System.Text.Encoding.UTF8.GetBytes("data");fileStream.Write(datastring, 0, 4);Byte[] subChunk2 = BitConverter.GetBytes(samples * channels * 2);fileStream.Write(subChunk2, 0, 4);//      fileStream.Close();  }private AudioClip GetTransformAudioClip(AudioClip srcAudioClip, float minSecond){var samples = new float[srcAudioClip.samples];srcAudioClip.GetData(samples, 0);return GetTransformAudioClip(new List<float>(samples), minSecond, srcAudioClip.channels, srcAudioClip.frequency);}private AudioClip GetTransformAudioClip(List<float> samples, float min, int channels, int hz){return GetTransformAudioClip(samples, min, channels, hz, false, false);}private AudioClip GetTransformAudioClip(List<float> samples, float min, int channels, int hz, bool _3D, bool stream){int i;bool isLessMin = true;for (i = 0; i < samples.Count; i++){if (Mathf.Abs(samples[i]) > min){isLessMin = false;break;}}// less than the min seconds, so can't get the audio clipif (isLessMin)return null;if (samples.Count > i){samples.RemoveRange(0, i);}if (samples.Count > i){samples.RemoveRange(0, i);}for (i = samples.Count - 1; i > 0; i--){if (Mathf.Abs(samples[i]) > min){break;}}if (samples.Count > (samples.Count - i)){samples.RemoveRange(i, samples.Count - i);}var clip = AudioClip.Create("TempClip", samples.Count, channels, hz, _3D, stream);clip.SetData(samples.ToArray(), 0);return clip;}
}

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