linux上的java声音：如何从TargetDataLine中快速捕获到足以跟上

我正在使用Java声音API和Java 1.7.当我在Linux上运行我的应用程序时,我很难快速地从TargetDataLine读取以跟上记录的内容(java版“1.7.0_51”,Java(TM)SE运行时环境(版本1.7.0_51-b13),Java HotSpot(TM)64位服务器VM(构建24.51-b03,混合模式),Red Hat Enterprise Linux 5).在我的Windows 7笔记本电脑上运行相同的程序时,我没有这个问题.我有点难过.

为了隔离这个问题,我编写了一个程序,它从TargetDataLine中捕获一段时间(交互式确定)并记录每次在固定字节数的阻塞读取中花费的时间,然后将它们与平均值一起打印出来读取时间,已用时间和捕获的音频时间.

我的测试程序如下：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.Mixer;
import javax.sound.sampled.TargetDataLine;

/**
 * This is a test of mic capture delay for given buffer and fetch settings.
 */
public class MicCaptureDelayTest {

   /**
    * the audio format used for capturing and transmitting
    */
   private static final AudioFormat format =
         new AudioFormat(8000,16,1,true,true);

   /**
    * This is the target data line buffer size to request,in bytes.
    */
   private static final int MIC_BUFFER_SIZE = 1000;

   /**
    * This is the number of bytes to try to fetch from the target data line at a
    * time.
    */
   private static final int MIC_FETCH_SIZE = 480;

   /**
    * Searches for available mixers on the system that have a microphone.
    * @return a list of matching mixers
    */
   private static List