java音频文件pcm转wav

￡神魔★判官ぃ 2022-05-10 18:04 319阅读 0赞

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

/\*\*  
 \* PCM文件转换成Wav格式音频  
 \* @author chuanye.wan  
 \*  
 \*/  
public class PCM2WAV \{

/\*\*  
 \* 转换音频文件  
 \* @param src 需要转换的pcm音频路径  
 \* @param target 保存转换后wav格式的音频路径  
 \* @throws Exception  
 \*/  
public static void convertAudioFiles(String src, String target) throws Exception \{  
       FileInputStream fis = new FileInputStream(src);  
       FileOutputStream fos = new FileOutputStream(target);

//计算长度  
       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();

//填入参数，比特率等等。这里用的是16位单声道 8000 hz  
       WaveHeader header = new WaveHeader();  
       //长度字段 = 内容的大小（PCMSize) + 头部字段的大小(不包括前面4字节的标识符RIFF以及fileLength本身的4字节)  
       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标准，头部应该是44字节  
       //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!");  
    \}

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

\}     
下面是辅助类

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

/\*\*  
 \* WavHeader辅助类,用于生成头部信息  
 \* @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   
来源：CSDN   
原文：https://blog.csdn.net/qq\_37980436/article/details/64923299   
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