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我在java中有一個紙牌遊戲。 我想在每當我mouseOver卡時發揮音效。但與此同時，這張卡片將「彈出」。預加載SourceDataLine以減少延遲
但是，當我試圖通過run（）方法來實現它時，它會變得遲緩，也就是說，卡片沒有彈出聲音那樣快。
因此我創建了另一種方法run(int effect)和reloadLine(SourceDataLine line, int effect)。
reloadLine(line,effect)類似於run()，只是我刪除在末尾drain()和close()，並將其移動到run(int effect)。
下面是我的SoundEffects.java類：
package nusMonopolyDealGUI;
import javax.media.*;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Scanner;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.swing.JOptionPane;
public class SoundEffects implements Runnable
{
private static final int EXTERNAL_BUFFER_SIZE = 128000;
private static int BUTTON_CLICK = 0;
private final int MOUSE_OVER_CARD = 1;
private final int MOUSE_CLICK_CARD = 2;
private static int activeSoundEffect;
private static SourceDataLine lineOverCard = null;
private static SourceDataLine lineClickCard = null;
private static ArrayList<SourceDataLine> sound;
private static ArrayList<String> soundEffects;
// CONSTRUCTOR //
public SoundEffects(){
soundEffects = new ArrayList<String>();
populateSoundEffects();
}
private void populateSoundEffects() {
try{
Scanner scanner = new Scanner(new File("soundEffectsList.txt"));
while(scanner.hasNextLine()){
String line = scanner.nextLine();
soundEffects.add(line);
}
scanner.close();
}
catch (IOException exp){
System.out.println("soundList.txt not found!");
}
//update soundEffects ArrayList with paths names of type D:\the\directory\path\...
for (int i = 0; i <soundEffects.size(); i ++){
String path = soundEffects.get(i);
URL pathURL = getClass().getResource("/music/" + path + ".wav");
String pathString = pathURL.toString();
String properPathString = pathString.replace("file:/", "");
soundEffects.set(i, properPathString);
}
//fill up the class attribute lines first for fast playback
reloadLine(lineOverCard, MOUSE_OVER_CARD);
reloadLine(lineClickCard, MOUSE_CLICK_CARD);
}
// METHODS //
public void setActiveSound(int i){
activeSoundEffect = i;
}
public void run(int effect){
switch(effect){
case MOUSE_OVER_CARD:
System.out.println("lineopen: "+ lineOverCard.isOpen());
if (!lineOverCard.isActive()){
lineOverCard.drain();
lineOverCard.close();
}
reloadLine(lineOverCard, MOUSE_OVER_CARD);
break;
case MOUSE_CLICK_CARD:
lineClickCard.drain();
lineClickCard.close();
reloadLine(lineClickCard, MOUSE_CLICK_CARD);
break;
}
}
//reload the line to reduce waiting time to load the line from buffer.
public void reloadLine(SourceDataLine line, int effect){
/*
* create an abstract object File to represent the directory of the .wav file.
*/
String filename = soundEffects.get(effect);
System.out.println("first time here");
File soundFile = new File(filename);
System.out.println(filename);
/* create an AudioInputStream and give it the .wav file
* @exception: dump the stack trace and exit the system.
*/
AudioInputStream audioInputStream = null;
try
{
audioInputStream = AudioSystem.getAudioInputStream(soundFile);
}
catch (Exception e)
{
e.printStackTrace();
System.exit(1);
}
/*
* get info on the .wav file
* this info is used by Java Sound to get a compatible Line
*/
AudioFormat audioFormat = audioInputStream.getFormat();
/*
* Create a SourceDataLine (used to generally play an audio file)
* Create an DataLine.Info object to be passed into the SourceDataLine
* so it will fetch the compatible line (getLine(info)) to use.
*/
//line = null;
DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
try
{
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(audioFormat); //need to open a line before inputting audio input
}
catch (LineUnavailableException e)
{
e.printStackTrace();
System.exit(1);
}
catch (Exception e)
{
e.printStackTrace();
System.exit(1);
}
line.start();
/*
* Line is ready to pass audio input.
* We write the audio data (.wav) into the line
* 1) read data from audioInputStream into a BUFFER
* 2) write from BUFFER to Line
* 3) we loop
* audioInputStream ---> BUFFER ---> Line
* until we reeach the end of audioInputStream
* indicated by a -1 from the read method of the audioInputStream (ie. audioInputStream.read(arg0, arg1, arg2))
*/
int nBytesRead = 0;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
while (nBytesRead != -1)
{
try
{
nBytesRead = audioInputStream.read(abData, 0, abData.length);
}
catch (IOException e)
{
e.printStackTrace();
}
if (nBytesRead >= 0)
{
int nBytesWritten = line.write(abData, 0, nBytesRead);
}
}
}
public void run()
{
/*
* create an abstract object File to represent the directory of the .wav file.
*/
String filename = soundEffects.get(activeSoundEffect);
File soundFile = new File(filename);
/* create an AudioInputStream and give it the .wav file
* @exception: dump the stack trace and exit the system.
*/
AudioInputStream audioInputStream = null;
try
{
audioInputStream = AudioSystem.getAudioInputStream(soundFile);
}
catch (Exception e)
{
e.printStackTrace();
System.exit(1);
}
/*
* get info on the .wav file
* this info is used by Java Sound to get a compatible Line
*/
AudioFormat audioFormat = audioInputStream.getFormat();
/*
* Create a SourceDataLine (used to generally play an audio file)
* Create an DataLine.Info object to be passed into the SourceDataLine
* so it will fetch the compatible line (getLine(info)) to use.
*/
SourceDataLine line = null;
DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
try
{
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(audioFormat); //need to open a line before inputting audio input
}
catch (LineUnavailableException e)
{
e.printStackTrace();
System.exit(1);
}
catch (Exception e)
{
e.printStackTrace();
System.exit(1);
}
line.start();
/*
* Line is ready to pass audio input.
* We write the audio data (.wav) into the line
* 1) read data from audioInputStream into a BUFFER
* 2) write from BUFFER to Line
* 3) we loop
* audioInputStream ---> BUFFER ---> Line
* until we reeach the end of audioInputStream
* indicated by a -1 from the read method of the audioInputStream (ie. audioInputStream.read(arg0, arg1, arg2))
*/
int nBytesRead = 0;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
while (nBytesRead != -1)
{
try
{
nBytesRead = audioInputStream.read(abData, 0, abData.length);
}
catch (IOException e)
{
e.printStackTrace();
}
if (nBytesRead >= 0)
{
int nBytesWritten = line.write(abData, 0, nBytesRead);
}
}
/*
* after filling the line, we drain it
* ie. play the data in the line
*/
line.drain();
//close the line after playing.
line.close();
}
}
的想法是有兩個的SourceDataLine屬性與.wav文件預裝類。
的問題是，有輕微的滯後