PCM錄音數據轉Wav格式（java版）

package com.example.pcm2wave;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

public class WaveHeader {

private char fileID[] = { 'R', 'I', 'F', 'F' };

private int fileLength;

private char wavTag[] = { 'W', 'A', 'V', 'E' };

private char fmtHdrID[] = { 'f', 'm', 't', ' ' };

private int fmtHdrLeth = 16;

private short formatTag = 1;

public short channels = 1;

public short sampleRate = 16000;

public short bitsPerSample = 16;

private short blockAlign = (short)(channels * bitsPerSample / 8);

private int avgBytesPerSec = blockAlign * sampleRate;

private char dataHdrID[] = { 'd', 'a', 't', 'a' };

private int dataHdrLeth;

public WaveHeader (int fileLength){

this.fileLength = fileLength + (44 - 8);

dataHdrLeth = fileLength;

}

public WaveHeader (int fileLength, short channels, short sampleRate, short bitsPerSample){

this.fileLength = fileLength + (44 - 8);

dataHdrLeth = fileLength;

this.channels = channels;

this.sampleRate = sampleRate;

this.bitsPerSample = bitsPerSample;

blockAlign = (short)(channels * bitsPerSample / 8);

avgBytesPerSec = blockAlign * sampleRate;

}

/**

* @return byte[] 44個字節

* @throws IOException

*/

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, sampleRate);

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);

}

}

}

使用方法：

// fileLength 錄音數據的長度

WaveHeader header = new WaveHeader(fileLength);

// 返回44個字節的數組

byte[] waveHeaderBytes = header.getHeader();