Unity保存錄音文件到本地（1）

using UnityEngine;
using System.Collections;
using System.IO;
using System;

public class SaveAudio : MonoBehaviour
{
    private  int bufferSize;
    private int numBuffers;
    private int outputRate = 44100;
    private string fileName = "recTest.wav";
    private int headerSize = 44; //default for uncompressed wav

    private bool recOutput;

    private FileStream fileStream;


    void Awake()
    {
        AudioSettings.outputSampleRate = outputRate;
    }

    void Start()
    {
        AudioSettings.GetDSPBufferSize(out bufferSize, out numBuffers);
    }

    void Update()
    {
        if (Input.GetKeyDown("r"))
        {
            print("rec");
            if (recOutput == false)
            {
                StartWriting(fileName);
                recOutput = true;
            }
            else
            {
                recOutput = false;
                WriteHeader();
                print("rec stop");
            }
        }
    }

    void StartWriting(string name)
    {
        fileStream = new FileStream(name, FileMode.Create);
        byte emptyByte = new byte();

        for (int i = 0; i < headerSize; i++) //preparing the header
        {
            fileStream.WriteByte(emptyByte);
        }
    }

    void OnAudioFilterRead(float[] data, int channels)
    {
        if (recOutput)
        {
            ConvertAndWrite(data); //audio data is interlaced
        }
    }

    void ConvertAndWrite(float[] dataSource)
    {

        Int16[] intData = new Int16[dataSource.Length];
        //converting in 2 steps : float[] to Int16[], //then Int16[] to Byte[]

        Byte[] bytesData = new Byte[dataSource.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 < dataSource.Length; i++)
        {
            intData[i] = (short)(dataSource[i] * rescaleFactor);
            Byte[] byteArr = new Byte[2];
            byteArr = BitConverter.GetBytes(intData[i]);
            byteArr.CopyTo(bytesData, i * 2);
        }
    }

    void WriteHeader()
    {

        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(two);
        fileStream.Write(numChannels, 0, 2);

        Byte[] sampleRate = BitConverter.GetBytes(outputRate);
        fileStream.Write(sampleRate, 0, 4);

        Byte[] byteRate = BitConverter.GetBytes(outputRate * 4);
        // sampleRate * bytesPerSample*number of channels, here 44100*2*2

        fileStream.Write(byteRate, 0, 4);

        UInt16 four = 4;
        Byte[] blockAlign = BitConverter.GetBytes(four);
        fileStream.Write(blockAlign, 0, 2);

        UInt16 sixteen = 16;
        Byte[] bitsPerSample = BitConverter.GetBytes(sixteen);
        fileStream.Write(bitsPerSample, 0, 2);

        Byte[] dataString = System.Text.Encoding.UTF8.GetBytes("data");
        fileStream.Write(dataString, 0, 4);

        Byte[] subChunk2 = BitConverter.GetBytes(fileStream.Length - headerSize);
        fileStream.Write(subChunk2, 0, 4);

        fileStream.Close();
    }
}

   

原文地址點擊這裏