mp3ecoding.java

MP3编码程序

import javax.swing.*; 
import java.io.*; 
import javax.sound.sampled.*; 
import javax.sound.midi.*; 
import java.awt.*; 
import java.awt.event.*; 
import javax.sound.sampled.AudioFormat.Encoding; 
import java.util.*; 

//高效设计：如果要设计一个要在其它类作为线程的类，最好把此类设计为Runnable型 
//不要在此类中调用线程，最好把此类作为一个Runnable接口使用 
public class Mp3Ecoding implements Runnable 
{ 
String filename; 
AudioInputStream stream; 
SourceDataLine playLine; 
AudioFormat baseFormat; 
long currentByte = 0; 
boolean isPause; 
int numThread = 0; 
int numBytesRead = -1; 
int bufferSize; 
private FileInputStream in; 
public Mp3Ecoding() 
{ 

//currentByte = bufferSize; 
} 
private void getFormat(String filename) 
{ 

try 
{ 
//in = new FileInputStream(new File(filename)); 
//AudioFileFormat af = mt.getAudioFileFormat(in); 
	stream = AudioSystem.getAudioInputStream(new File(filename)); 
} 
catch(Exception e) 
{ 
	e.printStackTrace(); 
} 
	baseFormat = stream.getFormat(); 
//	int firstExtendnameIndex = filename.lastIndexOf("."); 
//	String extendStr = filename.substring(firstExtendnameIndex+1); 
//	if(!extendStr.equalsIgnoreCase("wav")) 
//	{ 
//	//	System.out.println(String.valueOf(extendStr.equalsIgnoreCase("wav"))); 
//		baseFormat = decodingMusic(baseFormat); 
//	} 



} 
private AudioFormat decodingMusic(AudioFormat format) 
{ 
	AudioFormat decodedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 
	format.getSampleRate(), 
	format.getSampleSizeInBits(), 
	format.getChannels(), 
	format.getFrameSize(), 
	format.getFrameRate(), 
	format.isBigEndian());
	
	return decodedFormat; 
} 
private SourceDataLine getLine(AudioFormat f) 
{ 
	RandomAccessFile source = null; 
	try{ 
		source = new RandomAccessFile(filename,"r"); 
	}catch(Exception e){} 
	
	SourceDataLine line = null; 
	DataLine.Info info = new DataLine.Info(SourceDataLine.class,f); 
	bufferSize = baseFormat.getFrameSize() * 
	Math.round(baseFormat.getSampleRate() / 10); 
	byte[] buffer = new byte[bufferSize]; 
	
	try 
	{ 
		line = (SourceDataLine)AudioSystem.getLine(info); 
		line.open(f, bufferSize); 
	} 
	catch (LineUnavailableException ex) 
	{ 
		ex.printStackTrace(); 
	} 
	line.start(); 

// copy data to the line 
	try { 
	
	//do{ 
	if((numBytesRead == -1)&&(MusicFrame.getIsPlay() == true)) 
	
	{ 
	currentByte = buffer.length; 
	numBytesRead = 0; 
	} 
	source.seek(currentByte); 
	
	while ((numBytesRead != -1)&&(MusicFrame.getIsPause()!=true)) { 
		numBytesRead = source.read(buffer, 0, buffer.length); 
		currentByte += numBytesRead; 
		if (numBytesRead != -1) { 
		line.write(buffer, 0, numBytesRead); 
		} 
	} 
	
	if(MusicFrame.getIsStop() == true) currentByte = buffer.length; 
	//}while((MusicFrame.getIsCycle() == true)&&(numBytesRead == -1)); 
	} 
	catch (Exception ex) { 
		ex.printStackTrace(); 
	} 
	
	return line; 
} 

public void run() 
{ 
	play(); 
} 


public synchronized void play() 
{ 
setFilename(filename); 
getFormat(filename); 

playLine = getLine(baseFormat); 
//playLine.drain();//write会自动调用drain方法 
if((MusicFrame.getIsCycle() == true)&&(MusicFrame.getIsPlay() == true)) 
{ 
Random f = new Random(); 
int index = f.nextInt(MusicFrame.getNameList().size()); 

filename = (String)MusicFrame.getNameList().getElementAt(index); 

play(); 
} 
playLine.close(); 


//numThread = 0; 
} 
public void setFilename(String name) 
{ 
if(name == null) 
{ 
name = MusicFrame.getFilename(); 
} 
filename = name; 
} 



}