使用字节数组创建 AudioInputStream

Question

我仍在努力在 JAVA 中创建一个调音台的小项目，但我遇到了新障碍。我正在尝试从 byteArray 创建一个 audioInputStream，然后读取它来听声音。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");
}

}

这是我控制台的输出：

终于…… 线路关闭

流已关闭。

输出流的大小：35527724

字节数组的大小：35527724

接口 SourceDataLine 支持格式 PCM_SIGNED 未知采样率、16 位、立体声、4 bytes/frame、小端字节序和 0 到 1000000 字节的缓冲区

行开始

0 1个 2个 3

没有字节了！线路停止

我的原始文件的大小为 35.5 Mo，我的字节数组的长度为 35.527.727，所以看起来是可以的。然后，我的 "chunk" 数组的大小为 1024，因此，我预计大约有 37700 个循环。那么为什么我的 "loop count" 停在 "3" 处？

我希望我的代码在注释中足够清楚。感谢您的帮助 ;-)

Answer 1

好吧，我想：我很蠢。当我创建 audioInputStream2 时，我只是没有充分注意最后一个参数。

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

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

使用字节数组创建 AudioInputStream

Using a byte array to create an AudioInputStream

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