使用字节数组创建AudioInputStream

Question

我仍然在做我的小项目，用JAVA创建一个调音台，但遇到了新的障碍。 我正在尝试从byteArray创建一个audioInputStream，然后读取它以听到声音。 但是我的代码有问题：我什么也没听到。

这是我的代码：

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.OutputStream;

import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.TargetDataLine;

public class SoudTest {
private SourceDataLine sLine;
private AudioFormat audioFormat;
private AudioInputStream audioInputStream;
private AudioInputStream audioInputStream2;
private ByteArrayOutputStream byteArrayOutputStream= new ByteArrayOutputStream();;
private File file = new File ("test.wav");
private File file2 = new File ("test2.wav");
SoudTest () {
    /*
     * The aim of this code is to test the possibility or creating a mixing console in JAVA like the physical mixing consoles
     * First step : Create an inputstream from a file, a microphone or anything else
     * This is like plugging a source to a line-in of a stripe of a mixing console
     * Second : Reading this input stream and create a byte array
     * This byte array will be sent to the "master output" of the mixing console
     * Question to answer later : how to create a byte array that will act like a buffer for the next steps...
     * Third : Using this byte array to create an audioInputStream
     * This step is like having the "master volume" getting what is sent by the stripe.
     * Fourth : reading this audioInputStream
     * The sound should flow out to the speaker
     */

    //1st step      
    try {
        audioInputStream=AudioSystem.getAudioInputStream(file);

    } catch (Exception e) {
        e.printStackTrace();
    }


    AudioFileFormat.Type targetType = AudioFileFormat.Type.WAVE;

    //2nd step
    try {
        AudioSystem.write(audioInputStream, targetType, byteArrayOutputStream);

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        System.out.println("Finally...");
        //tLine.close();
        System.out.println("Line closed");
        try {
            audioInputStream.close();
            System.out.println("Stream closed.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    /////////////////////////////////////////////////////////////

    //3rd step
    System.out.println("Size of the outputStream : "+byteArrayOutputStream.size());
    byte[] byteArray = byteArrayOutputStream.toByteArray();
    System.out.println("Size of byte array : "+byteArray.length);
    ByteArrayInputStream bis = new ByteArrayInputStream(byteArray);

    audioFormat = new AudioFormat(44100, 16, 2, true, false);
    audioInputStream2=new AudioInputStream(bis, audioFormat, 1024);

    DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
    try  {
        //System.out.println(info);
        sLine=(SourceDataLine) AudioSystem.getLine(info);
        System.out.println(sLine.getLineInfo());
    } catch (Exception e) {
        e.printStackTrace();
    }

    try {
        sLine.open(audioFormat);
    } catch (Exception e){
        e.printStackTrace();
    }
    sLine.start();
    System.out.println("Line Started");


    //4th step
    try {
        byte bytes[] =  new byte[1024];
        int bytesRead=0;
        int loop=0;
        while ((bytesRead=audioInputStream2.read(bytes, 0, bytes.length))!= -1) {
            //getVolumeLevel(bytes);
            try {
                sLine.write(bytes, 0, bytesRead);
                System.out.println(loop);
            } catch (Exception e) {
                e.printStackTrace();
            }
            loop+=1;
        }
        System.out.println("No bytes anymore !");

    } catch (Exception e) {
        e.printStackTrace();
    }       
    System.out.println("Line stopped");
}

}

这是我的控制台中的输出：

最后...线关闭

流关闭。

outputStream的大小：35527724

字节数组的大小：35527724

接口SourceDataLine支持格式PCM_SIGNED的未知采样率，16位，立体声，4字节/帧，little-endian和0到1000000字节的缓冲区

行开始

0 1 2 3

没有字节了！ 行已停止

我的原始文件的大小为35.5 Mo，字节数组的长度为35.527.727，因此，这似乎是可能的。 然后，我的“块”数组的大小为1024，因此，我期望37700左右的循环。 那么，为什么我的“循环计数”停在“ 3”呢？

我希望我的代码与注释清楚。 谢谢您的帮助 ;-）

Answer 1

好吧，我想：我很傻。 创建audioInputStream2时，我只是没有足够注意最后一个参数。

而不是： audioInputStream2=new AudioInputStream(bis, audioFormat, 1024);

我应该写： audioInputStream2=new AudioInputStream(bis, audioFormat, byteArray.length);