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如何捕获音频及输出音频

2005-07-29 15:52 239 查看

如何捕获音频及输出音频。

这是我原来用过的两段代码，输出音频和捕获音频。
构造器里的socket是用来接受来自网络的音频数据。不做网络音频可以去掉它。

希望能与大家分享经验。8-）

import java.io.*;
import javax.sound.sampled.*;
import java.net.*;

/**
* Title: VoiceChat
* Description: 输出音频（放音程序）
* Copyright: Copyright (c) 2001
* Company:
* @author 你猜！
* @version 1.0
*/

class Playback implements Runnable {

final int bufSize = 16384;
SourceDataLine line;
Thread thread;
Socket s;

Playback(Socket s){//构造器取得socket以获得网络输入流
this.s=s;
}
public void start() {

thread = new Thread(this);
thread.setName("Playback");
thread.start();
}

public void stop() {
thread = null;
}

public void run() {

AudioFormat format =new AudioFormat(8000,16,2,true,true);//AudioFormat(float sampleRate, int sampleSizeInBits, int channels, boolean signed, boolean bigEndian）
BufferedInputStream playbackInputStream;

try {
playbackInputStream=new BufferedInputStream(new AudioInputStream(s.getInputStream(),format,2147483647));//封装成音频输出流，如果网络流是经过压缩的需在此加套解压流
}
catch (IOException ex) {
return;
}

DataLine.Info info = new DataLine.Info(SourceDataLine.class,format);

try {
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(format, bufSize);
} catch (LineUnavailableException ex) {
return;
}

byte[] data = new byte[1024];//此处数组的大小跟实时性关系不大，可根据情况进行调整
int numBytesRead = 0;
line.start();

while (thread != null) {
try{
numBytesRead = playbackInputStream.read(data);
line.write(data, 0,numBytesRead);
} catch (IOException e) {
break;
}
}

if (thread != null) {
line.drain();
}

line.stop();
line.close();
line = null;
}
}

import java.io.*;
import javax.sound.sampled.*;
import java.net.*;

/**
* Title: VoiceChat
* Description: 音频捕捉（录音程序）
* Copyright: Copyright (c) 2001
* Company:
* @author 你猜！
* @version 1.0
*/

class Capture implements Runnable {

TargetDataLine line;
Thread thread;
Socket s;
BufferedOutputStream captrueOutputStream;

Capture(Socket s){//构造器取得socket以获得网络输出流
this.s=s;
}

public void start() {

thread = new Thread(this);
thread.setName("Capture");
thread.start();
}

public void stop() {
thread = null;
}

public void run() {

try {
captrueOutputStream=new BufferedOutputStream(s.getOutputStream());//建立输出流此处可以加套压缩流用来压缩数据
}
catch (IOException ex) {
return;
}

AudioFormat format =new AudioFormat(8000,16,2,true,true);//AudioFormat(float sampleRate, int sampleSizeInBits, int channels, boolean signed, boolean bigEndian）
DataLine.Info info = new DataLine.Info(TargetDataLine.class,format);

try {
line = (TargetDataLine) AudioSystem.getLine(info);
line.open(format, line.getBufferSize());
} catch (Exception ex) {
return;
}

byte[] data = new byte[1024];//此处的1024可以情况进行调整，应跟下面的1024应保持一致
int numBytesRead=0;
line.start();

while (thread != null) {
numBytesRead = line.read(data, 0,1024);//取数据（1024）的大小直接关系到传输的速度，一般越小越快，
try {
captrueOutputStream.write(data, 0, numBytesRead);//写入网络流
}
catch (Exception ex) {
break;
}
}

line.stop();
line.close();
line = null;

try {
captrueOutputStream.flush();
captrueOutputStream.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}

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