java如何合并两个wav文件 csdn_Java实现多个wav文件合成一个的方法示例

本文实例讲述了Java实现多个wav文件合成一个的方法。分享给大家供大家参考，具体如下：

前面一篇介绍了java切割wav音频文件的方法，这里再给出合并多个wav音频文件的方法。

package com.cmos.nomsapp.utils.wavmeger;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.RandomAccessFile;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

import java.util.ArrayList;

import java.util.List;

/**

* 获取wav头文件然后合并成单个wav

* @author zcf

* @date 2017-10-17

*/

public class WavMergeUtil {

/**

* meger多个wav

* @param inputs 多个wav

* @param output 要生成的wav

* @throws IOException

*/

public static void mergeWav(File[] inputs, String output) throws IOException {

if (inputs.length < 1) {

return;

}

try(FileInputStream fis = new FileInputStream(inputs[0]);

FileOutputStream fos = new FileOutputStream(new File(output))){

byte[] buffer = new byte[1024 * 4];

int total = 0;

int count;

while ((count = fis.read(buffer)) > -1) {

fos.write(buffer, 0, count);

total += count;

}

fis.close();

for (int i = 1; i < inputs.length; i++) {

File file = inputs[i];

try(FileInputStream fisH = new FileInputStream(file)){

Header header = resolveHeader(fisH);

FileInputStream dataInputStream = header.dataInputStream;

while ((count = dataInputStream.read(buffer)) > -1) {

fos.write(buffer, 0, count);

total += count;

}

}

}

fos.flush();

fos.close();

FileInputStream fisHo = new FileInputStream(new File(output));

Header outputHeader = resolveHeader(fisHo);

outputHeader.dataInputStream.close();

try(RandomAccessFile res = new RandomAccessFile(output, "rw")){

res.seek(4);

byte[] fileLen = intToByteArray(total + outputHeader.dataOffset - 8);

res.write(fileLen, 0, 4);

res.seek(outputHeader.dataSizeOffset);

byte[] dataLen = intToByteArray(total);

res.write(dataLen, 0, 4);

}

}

}

/**

* 解析头部，并获得文件指针指向数据开始位置的InputStreram，记得使用后需要关闭

*/

private static Header resolveHeader(FileInputStream fis) throws IOException {

byte[] byte4 = new byte[4];

byte[] buffer = new byte[2048];

int readCount = 0;

Header header = new Header();

fis.read(byte4);// RIFF

fis.read(byte4);

readCount += 8;

header.fileSizeOffset = 4;

header.fileSize = byteArrayToInt(byte4);

fis.read(byte4);// WAVE

fis.read(byte4);// fmt

fis.read(byte4);

readCount += 12;

int fmtLen = byteArrayToInt(byte4);

fis.read(buffer, 0, fmtLen);

readCount += fmtLen;

fis.read(byte4);// data or fact

readCount += 4;

if (isFmt(byte4, 0)) {// 包含fmt段

fis.read(byte4);

int factLen = byteArrayToInt(byte4);

fis.read(buffer, 0, factLen);

fis.read(byte4);// data

readCount += 8 + factLen;

}

fis.read(byte4);// data size

int dataLen = byteArrayToInt(byte4);

header.dataSize = dataLen;

header.dataSizeOffset = readCount;

readCount += 4;

header.dataOffset = readCount;

header.dataInputStream = fis;

return header;

}

private static boolean isRiff(byte[] bytes, int start) {

if (bytes[start + 0] == 'R' && bytes[start + 1] == 'I' && bytes[start + 2] == 'F' && bytes[start + 3] == 'F') {

return true;

} else {

return false;

}

}

private static boolean isFmt(byte[] bytes, int start) {

if (bytes[start + 0] == 'f' && bytes[start + 1] == 'm' && bytes[start + 2] == 't' && bytes[start + 3] == ' ') {

return true;

} else {

return false;

}

}

private static boolean isData(byte[] bytes, int start) {

if (bytes[start + 0] == 'd' && bytes[start + 1] == 'a' && bytes[start + 2] == 't' && bytes[start + 3] == 'a') {

return true;

} else {

return false;

}

}

/**

* 将int转化为byte[]

*/

private static byte[] intToByteArray(int data) {

return ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(data).array();

}

/**

* 将short转化为byte[]

*/

private static byte[] shortToByteArray(short data) {

return ByteBuffer.allocate(2).order(ByteOrder.LITTLE_ENDIAN).putShort(data).array();

}

/**

* 将byte[]转化为short

*/

private static short byteArrayToShort(byte[] b) {

return ByteBuffer.wrap(b).order(ByteOrder.LITTLE_ENDIAN).getShort();

}

/**

* 将byte[]转化为int

*/

private static int byteArrayToInt(byte[] b) {

return ByteBuffer.wrap(b).order(ByteOrder.LITTLE_ENDIAN).getInt();

}

/**

* 头部部分信息

*/

static class Header {

public int fileSize;

public int fileSizeOffset;

public int dataSize;

public int dataSizeOffset;

public int dataOffset;

public FileInputStream dataInputStream;

}

}

希望本文所述对大家java程序设计有所帮助。