本文实例讲述了java读取wav文件(波形文件)并绘制波形图的方法。分享给大家供大家参考。具体如下：

因为最近有不少网友询问我波形文件读写方面的问题，出于让大家更方便以及让代码能够得到更好的改进，我将这部分(波形文件的读写)代码开源在github上面。

地址为https://github.com/sintrb/waveaccess/，最新的代码、例子、文档都在那上面，我会在我时间精力允许的前提下对该项目进行维护，同时也希望对这方面有兴趣的网友能够加入到该开源项目上。

以下内容基本都过期了，你可以直接去github上面阅读、下载该项目。

因项目需要读取.wav文件(波形文件)并绘制波形图，因此简单的做了这方面的封装。

其实主要是对wav文件读取的封装，下面是一个wav文件读取器的封装：

// filename: wavefilereader.java

// robintang

// 2012-08-23

import java.io.*;

public class wavefilereader {

private string filename = null;

private int[][] data = null;

private int len = 0;

private string chunkdescriptor = null;

static private int lenchunkdescriptor = 4;

private long chunksize = 0;

static private int lenchunksize = 4;

private string waveflag = null;

static private int lenwaveflag = 4;

private string fmtubchunk = null;

static private int lenfmtubchunk = 4;

private long subchunk1size = 0;

static private int lensubchunk1size = 4;

private int audioformat = 0;

static private int lenaudioformat = 2;

private int numchannels = 0;

static private int lennumchannels = 2;

private long samplerate = 0;

static private int lensamplerate = 2;

private long byterate = 0;

static private int lenbyterate = 4;

private int blockalign = 0;

static private int lenblockling = 2;

private int bitspersample = 0;

static private int lenbitspersample = 2;

private string datasubchunk = null;

static private int lendatasubchunk = 4;

private long subchunk2size = 0;

static private int lensubchunk2size = 4;

private fileinputstream fis = null;

private bufferedinputstream bis = null;

private boolean issuccess = false;

public wavefilereader(string filename) {

this.initreader(filename);

}

// 判断是否创建wav读取器成功

public boolean issuccess() {

return issuccess;

}

// 获取每个采样的编码长度，8bit或者16bit

public int getbitpersample(){

return this.bitspersample;

}

// 获取采样率

public long getsamplerate(){

return this.samplerate;

}

// 获取声道个数，1代表单声道 2代表立体声

public int getnumchannels(){

return this.numchannels;

}

// 获取数据长度，也就是一共采样多少个

public int getdatalen(){

return this.len;

}

// 获取数据

// 数据是一个二维数组，[n][m]代表第n个声道的第m个采样值

public int[][] getdata(){

return this.data;

}

private void initreader(string filename){

this.filename = filename;

try {

fis = new fileinputstream(this.filename);

bis = new bufferedinputstream(fis);

this.chunkdescriptor = readstring(lenchunkdescriptor);

if(!chunkdescriptor.endswith("riff"))

throw new illegalargumentexception("riff miss, " + filename + " is not a wave file.");

this.chunksize = readlong();

this.waveflag = readstring(lenwaveflag);

if(!waveflag.endswith("wave"))

throw new illegalargumentexception("wave miss, " + filename + " is not a wave file.");

this.fmtubchunk = readstring(lenfmtubchunk);

if(!fmtubchunk.endswith("fmt "))

throw new illegalargumentexception("fmt miss, " + filename + " is not a wave file.");

this.subchunk1size = readlong();

this.audioformat = readint();

this.numchannels = readint();

this.samplerate = readlong();

this.byterate = readlong();

this.blockalign = readint();

this.bitspersample = readint();

this.datasubchunk = readstring(lendatasubchunk);

if(!datasubchunk.endswith("data"))

throw new illegalargumentexception("data miss, " + filename + " is not a wave file.");

this.subchunk2size = readlong();

this.len = (int)(this.subchunk2size/(this.bitspersample/8)/this.numchannels);

this.data = new int[this.numchannels][this.len];

for(int i=0; i

for(int n=0; n

if(this.bitspersample == 8){

this.data[n][i] = bis.read();

}

else if(this.bitspersample == 16){

this.data[n][i] = this.readint();

}

}

}

issuccess = true;

} catch (exception e) {

e.printstacktrace();

}

finally{

try{

if(bis != null)

bis.close();

if(fis != null)

fis.close();

}

catch(exception e1){

e1.printstacktrace();

}

}

}

private string readstring(int len){

byte[] buf = new byte[len];

try {

if(bis.read(buf)!=len)

throw new ioexception("no more data!!!");

} catch (ioexception e) {

e.printstacktrace();

}

return new string(buf);

}

private int readint(){

byte[] buf = new byte[2];

int res = 0;

try {

if(bis.read(buf)!=2)

throw new ioexception("no more data!!!");

res = (buf[0]&0x000000ff) | (((int)buf[1])<<8);

} catch (ioexception e) {

e.printstacktrace();

}

return res;

}

private long readlong(){

long res = 0;

try {

long[] l = new long[4];

for(int i=0; i<4; ++i){

l[i] = bis.read();

if(l[i]==-1){

throw new ioexception("no more data!!!");

}

}

res = l[0] | (l[1]<<8) | (l[2]<<16) | (l[3]<<24);

} catch (ioexception e) {

e.printstacktrace();

}

return res;

}

private byte[] readbytes(int len){

byte[] buf = new byte[len];

try {

if(bis.read(buf)!=len)

throw new ioexception("no more data!!!");

} catch (ioexception e) {

e.printstacktrace();

}

return buf;

}

}

为了绘制波形，因此做了一个从jpanel教程而来的波形绘制面板：

// filename: drawpanel.java

// robintang

// 2012-08-23

import java.awt.color;

import java.awt.graphics;

import javax.swing.jpanel;

@suppresswarnings("serial")

public class drawpanel extends jpanel {

private int[] data = null;

public drawpanel(int[] data) {

this.data = data;

}

@override

protected void paintcomponent(graphics g) {

int ww = getwidth();

int hh = getheight();

g.setcolor(color.white);

g.fillrect(0, 0, ww, hh);

int len = data.length;

int step = len/ww;

if(step==0)

step = 1;

int prex = 0, prey = 0; //上一个坐标

int x = 0, y = 0;

g.setcolor(color.red);

double k = hh/2.0/32768.0;

for(int i=0; i

x = i;

// 下面是个三点取出并绘制

// 实际中应该按照采样率来设置间隔

y = hh-(int)(data[i*3]*k+hh/2);

system.out.print(y);

system.out.print(" ");

if(i!=0){

g.drawline(x, y, prex, prey);

}

prex = x;

prey = y;

}

}

}

有了这些之后就可以调用绘制了，简单的：

// wavefilereaddemo.java

// robintang

// 2012-08-23

import javax.swing.jframe;

public class wavefilereaddemo {

/**

* @param args

*/

public static void main(string[] args) {

// todo auto-generated method stub

string filename = "file.wav";

jframe frame = new jframe();

wavefilereader reader = new wavefilereader(filename);

if(reader.issuccess()){

int[] data = reader.getdata()[0]; //获取第一声道

drawpanel drawpanel = new drawpanel(data); // 创建一个绘制波形的面板

frame.add(drawpanel);

frame.settitle(filename);

frame.setsize(800, 400);

frame.setlocationrelativeto(null);

frame.setdefaultcloseoperation(jframe.exit_on_close);

frame.setvisible(true);

}

else{

system.err.println(filename + "不是一个正常的wav文件");

}

}

}

工程的源代码可以在我的百度网盘上找到，直接到开源java

放上效果图一张：

希望本文所述对大家的java程序设计有所帮助。

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