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Sample code for how Java uses IO streams to implement audio cutting and splicing

黄舟
Release: 2017-06-04 09:21:17
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这篇文章主要为大家详细介绍了Java使用IO流实现音频的剪切和拼接,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

需求: 使用IO流将指定目录下的若干个音频文件的高潮部分,进行剪切,并重新拼接成一首新的音频文件 

思路(以两首歌为例):

  第一首歌有一个输入流对象bis1。第二首歌有一个输入流对象bis2,他们公用一条输出流对象bos(在选择构造方法的时候选择含有布尔类型参数的那个),待第一首歌剪切完成后,在此基础上追加第二首歌的“高潮部分”。

实现代码:

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
 * 音乐剪切和拼接(音乐串烧)
 * @author 
 *
 */
public class CutMusic {

 public static void main(String[] args) {
  //f1,f2分别为需要剪切的歌曲路径
   File f1 = new File("E:\\CutMusicTest\\残酷月光(Cover:林宥嘉).mp3");
  File f2 = new File("E:\\CutMusicTest\\慢慢.mp3");
  //f为合并的歌曲
  File f = new File("E:\\CutMusicTest\\MergeMusic.mp3");
  cut1(f1,f2,f);
 }
 
 public static void cut1(File f1,File f2,File f){
  BufferedInputStream bis1 = null;
  BufferedInputStream bis2 = null;
  BufferedOutputStream bos = null;
  //第一首歌剪切部分起始字节
  int start1 = 2375680;//320kbps(比特率)*58s*1024/8=2375680 比特率可以查看音频属性获知
  int end1 = 4915200;//320kbps*120s*1024/8=4915200
  
  //第二首歌剪切部分起始字节,计算方式同上
  int start2 = 3686400;
  int end2 = 5324800;
  
  int tatol1 = 0;
  int tatol2 = 0;
  try {
   //两个输入流
   bis1 = new BufferedInputStream(new FileInputStream(f1));
   bis2 = new BufferedInputStream(new FileInputStream(f2));
   //缓冲字节输出流(true表示可以在流的后面追加数据,而不是覆盖!!)
   bos = new BufferedOutputStream(new FileOutputStream(f,true));
   
   //第一首歌剪切、写入
   byte[] b1= new byte[512];
   int len1 = 0;
   while((len1 = bis1.read(b1))!=-1){
    tatol1+=len1;   //累积tatol
    if(tatol1<start1 ){  //tatol小于起始值则跳出本次循环
     continue;
    }
    bos.write(b1);   //写入的都是在我们预先指定的字节范围之内
    if(tatol1>=end1 ){  //当tatol的值超过预先设定的范围,则立刻刷新bos流对象,并结束循环
     bos.flush();
     break;
    }
    
   }
   System.out.println("第一首歌剪切完成!");
   
   //第二首歌剪切、写入,原理同上
   byte[] b2= new byte[512];
   int len2 = 0;
   while((len2 = bis2.read(b2))!=-1){
    tatol2 += len2; 
    if(tatol2 < start2){ 
     continue;
    }
    bos.write(b2);  
    if(tatol2>=end2){ 
     bos.flush();
     break;
    }
    
   }
   System.out.println("第二首歌剪切完成!");
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally{
    try {//切记要关闭流!!
     if(bis1!=null) bis1.close();
     if(bis2!=null) bis2.close();
     if(bos!=null) bos.close();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
  }
 }

}
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获取音频文件比特率的方式:

运行结果:

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