如何使用Java合成wav文件?针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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;
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;
}
}
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