import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * PCM檔案轉換成Wav格式音訊
 * @author chuanye.wan
 *
 */
public class PCM2WAV {

/**
 * 轉換音訊檔案
 * @param src 需要轉換的pcm音訊路徑
 * @param target 儲存轉換後wav格式的音訊路徑
 * @throws Exception
 */
public static void convertAudioFiles(String src, String target) throws Exception {
       FileInputStream fis = new FileInputStream(src);
       FileOutputStream fos = new FileOutputStream(target);

       //計算長度
       byte[] buf = new byte[1024 * 4];
       int size = fis.read(buf);
       int PCMSize = 0;
       while (size != -1) {
          PCMSize += size;
          size = fis.read(buf);
        }
       fis.close();

       //填入引數，位元率等等。這裡用的是16位單聲道 8000 hz
       WaveHeader header = new WaveHeader();
       //長度欄位 = 內容的大小（PCMSize) + 頭部欄位的大小(不包括前面4位元組的識別符號RIFF以及fileLength本身的4位元組)
       header.fileLength = PCMSize + (44 - 8);
       header.FmtHdrLeth = 16;
       header.BitsPerSample = 16;
       header.Channels = 2;
       header.FormatTag = 0x0001;
       header.SamplesPerSec = 8000;
       header.BlockAlign = (short)(header.Channels * header.BitsPerSample / 8);
       header.AvgBytesPerSec = header.BlockAlign * header.SamplesPerSec;
       header.DataHdrLeth = PCMSize;

       byte[] h = header.getHeader();

       assert h.length == 44; //WAV標準，頭部應該是44位元組
       //write header
       fos.write(h, 0, h.length);
       //write data stream
       fis = new FileInputStream(src);
       size = fis.read(buf);
       while (size != -1) {
          fos.write(buf, 0, size);
          size = fis.read(buf);
       }
       fis.close();
       fos.close();
       System.out.println("Convert OK!");
    }

    //測試方法
    public static void main(String[] agrs) throws Exception{
        convertAudioFiles("D:\\upload\\TESTAAA1490076937681.pcm", "D:\\upload\\TESTAAA1490076937681.wav");
    }

}   
下面是輔助類

import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * WavHeader輔助類,用於生成頭部資訊
 * @author chuanye.wan
 *
 */
public class WaveHeader {

       public final char fileID[] = {'R', 'I', 'F', 'F'};
       public int fileLength;
       public char wavTag[] = {'W', 'A', 'V', 'E'};;
       public char FmtHdrID[] = {'f', 'm', 't', ' '};
       public int FmtHdrLeth;
       public short FormatTag;
       public short Channels;
       public int SamplesPerSec;
       public int AvgBytesPerSec;
       public short BlockAlign;
       public short BitsPerSample;
       public char DataHdrID[] = {'d','a','t','a'};
       public int DataHdrLeth;

    public byte[] getHeader() throws IOException {
       ByteArrayOutputStream bos = new ByteArrayOutputStream();
       WriteChar(bos, fileID);
       WriteInt(bos, fileLength);
       WriteChar(bos, wavTag);
       WriteChar(bos, FmtHdrID);
       WriteInt(bos,FmtHdrLeth);
       WriteShort(bos,FormatTag);
       WriteShort(bos,Channels);
       WriteInt(bos,SamplesPerSec);
       WriteInt(bos,AvgBytesPerSec);
       WriteShort(bos,BlockAlign);
       WriteShort(bos,BitsPerSample);
       WriteChar(bos,DataHdrID);
       WriteInt(bos,DataHdrLeth);
       bos.flush();
       byte[] r = bos.toByteArray();
       bos.close();
       return r;
    }

    private void WriteShort(ByteArrayOutputStream bos, int s) throws IOException {
       byte[] mybyte = new byte[2];
       mybyte[1] =(byte)( (s << 16) >> 24 );
       mybyte[0] =(byte)( (s << 24) >> 24 );
       bos.write(mybyte);
    }

    private void WriteInt(ByteArrayOutputStream bos, int n) throws IOException {
       byte[] buf = new byte[4];
       buf[3] =(byte)( n >> 24 );
       buf[2] =(byte)( (n << 8) >> 24 );
       buf[1] =(byte)( (n << 16) >> 24 );
       buf[0] =(byte)( (n << 24) >> 24 );
       bos.write(buf);
    }

    private void WriteChar(ByteArrayOutputStream bos, char[] id) {
       for (int i=0; i<id.length; i++) {
          char c = id[i];
          bos.write(c);
       }
    }

}
--------------------- 
作者：EasonGod 
來源：CSDN 
原文：https://blog.csdn.net/qq_37980436/article/details/64923299 
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