Unity 录音

using UnityEngine;using System;using System.IO;/// <summary>/// 音频扩展/// </summary>public static class AudioClipExtension{private static AudioClip clip;   private static int maxRecordTime = 10;  private static int samplingRate  = 12000;  /// <summary>/// 尝试录音/// </summary>/// <returns><c>true</c>, if start recording was tryed, <c>false</c> otherwise.</returns>public static bool TryStartRecording()  {  try  {  Microphone.End(null);  clip = Microphone.Start(null, false, maxRecordTime, samplingRate);  }  catch(Exception e)  {  return false;  }  return true;  }/// <summary>/// 录音结束/// </summary>/// <param name="length">Length.</param>/// <param name="outClip">Out clip.</param>public static void EndRecording(out int length, out AudioClip outClip)  {  int lastPos = Microphone.GetPosition(null);  if (Microphone.IsRecording(null))  {  length = lastPos / samplingRate;  }  else  {  length = maxRecordTime;  }  Microphone.End(null);  if (length < 1.0f)  {  outClip = null;  return;  }  outClip = clip;  } /// <summary>/// 获取一个音频的字节数组/// </summary>/// <returns>The data.</returns>/// <param name="clip">Clip.</param>public static byte[] GetData(this AudioClip clip,int _time ){var data = new float[_time * 15000 * clip.channels];clip.GetData(data, 0);byte[] bytes = new byte[data.Length * 4];Buffer.BlockCopy(data, 0, bytes, 0, bytes.Length);//Debug.Log ("------------------ bytes 字节： " + bytes.Length);return bytes;}/// <summary>/// 设置音频数据/// </summary>/// <param name="clip">Clip.</param>/// <param name="bytes">Bytes.</param>public static void SetData(this AudioClip clip, byte[] bytes){float[] data = new float[bytes.Length / 4];Buffer.BlockCopy(bytes, 0, data, 0, bytes.Length);if (clip == null) {Debug.Log ("clip == null    " + bytes.Length);} else {clip.SetData (data, 0);}}public static byte[] GetData16(this AudioClip clip){var data = new float[clip.samples * clip.channels];clip.GetData(data, 0);byte[] bytes = new byte[data.Length * 2];int rescaleFactor = 32767;for (int i = 0; i < data.Length; i++){short value = (short)(data[i] * rescaleFactor);BitConverter.GetBytes(value).CopyTo(bytes, i * 2);}return bytes;}/// <summary>/// wav格式音频转换为二进制文件/// </summary>/// <returns>The to WA.</returns>/// <param name="clip">Clip.</param>public static byte[] EncodeToWAV(this AudioClip clip){byte[] bytes = null;using (var memoryStream = new MemoryStream()){memoryStream.Write(new byte[44], 0, 44);//预留44字节头部信息byte[] bytesData = clip.GetData16();memoryStream.Write(bytesData, 0, bytesData.Length);memoryStream.Seek(0, SeekOrigin.Begin);byte[] riff = System.Text.Encoding.UTF8.GetBytes("RIFF");memoryStream.Write(riff, 0, 4);byte[] chunkSize = BitConverter.GetBytes(memoryStream.Length - 8);memoryStream.Write(chunkSize, 0, 4);byte[] wave = System.Text.Encoding.UTF8.GetBytes("WAVE");memoryStream.Write(wave, 0, 4);byte[] fmt = System.Text.Encoding.UTF8.GetBytes("fmt ");memoryStream.Write(fmt, 0, 4);byte[] subChunk1 = BitConverter.GetBytes(16);memoryStream.Write(subChunk1, 0, 4);UInt16 two = 2;UInt16 one = 1;byte[] audioFormat = BitConverter.GetBytes(one);memoryStream.Write(audioFormat, 0, 2);byte[] numChannels = BitConverter.GetBytes(clip.channels);memoryStream.Write(numChannels, 0, 2);byte[] sampleRate = BitConverter.GetBytes(clip.frequency);memoryStream.Write(sampleRate, 0, 4);byte[] byteRate = BitConverter.GetBytes(clip.frequency * clip.channels * 2); // sampleRate * bytesPerSample*number of channelsmemoryStream.Write(byteRate, 0, 4);UInt16 blockAlign = (ushort)(clip.channels * 2);memoryStream.Write(BitConverter.GetBytes(blockAlign), 0, 2);UInt16 bps = 16;byte[] bitsPerSample = BitConverter.GetBytes(bps);memoryStream.Write(bitsPerSample, 0, 2);byte[] datastring = System.Text.Encoding.UTF8.GetBytes("data");memoryStream.Write(datastring, 0, 4);byte[] subChunk2 = BitConverter.GetBytes(clip.samples * clip.channels * 2);memoryStream.Write(subChunk2, 0, 4);bytes = memoryStream.ToArray();}return bytes;}}