Java实现多个wav文件合成一个的方法示例

本文实例讲述了java实现多个wav文件合成一个的方法。分享给大家供大家参考，具体如下：

前面一篇介绍了，这里再给出合并多个wav音频文件的方法。

package com.cmos.nomsapp.utils.wavmeger;
import java.io.file;
import java.io.fileinputstream;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.randomaccessfile;
import java.nio.bytebuffer;
import java.nio.byteorder;
import java.util.arraylist;
import java.util.list;
/**
 * 获取wav头文件然后合并成单个wav
 * @author zcf
 * @date 2017-10-17
 */
public class wavmergeutil {
  /**
   * meger多个wav
   * @param inputs 多个wav
   * @param output 要生成的wav
   * @throws ioexception
   */
  public static void mergewav(file[] inputs, string output) throws ioexception {
    if (inputs.length < 1) {
      return;
    }
    try(fileinputstream fis = new fileinputstream(inputs[0]);
      fileoutputstream fos = new fileoutputstream(new file(output))){
      byte[] buffer = new byte[1024 * 4];
      int total = 0;
      int count;
      while ((count = fis.read(buffer)) > -1) {
        fos.write(buffer, 0, count);
        total += count;
      }
      fis.close();
      for (int i = 1; i < inputs.length; i++) {
        file file = inputs[i];
        try(fileinputstream fish = new fileinputstream(file)){
          header header = resolveheader(fish);
          fileinputstream datainputstream = header.datainputstream;
          while ((count = datainputstream.read(buffer)) > -1) {
            fos.write(buffer, 0, count);
            total += count;
          }
        }
      }
      fos.flush();
      fos.close();
      fileinputstream fisho = new fileinputstream(new file(output));
      header outputheader = resolveheader(fisho);
      outputheader.datainputstream.close();
      try(randomaccessfile res = new randomaccessfile(output, "rw")){
        res.seek(4);
        byte[] filelen = inttobytearray(total + outputheader.dataoffset - 8);
        res.write(filelen, 0, 4);
        res.seek(outputheader.datasizeoffset);
        byte[] datalen = inttobytearray(total);
        res.write(datalen, 0, 4);
      }
    }
  }
  /**
   * 解析头部，并获得文件指针指向数据开始位置的inputstreram，记得使用后需要关闭
   */
  private static header resolveheader(fileinputstream fis) throws ioexception {
      byte[] byte4 = new byte[4];
      byte[] buffer = new byte[2048];
      int readcount = 0;
      header header = new header();
      fis.read(byte4);// riff
      fis.read(byte4);
      readcount += 8;
      header.filesizeoffset = 4;
      header.filesize = bytearraytoint(byte4);
      fis.read(byte4);// wave
      fis.read(byte4);// fmt
      fis.read(byte4);
      readcount += 12;
      int fmtlen = bytearraytoint(byte4);
      fis.read(buffer, 0, fmtlen);
      readcount += fmtlen;
      fis.read(byte4);// data or fact
      readcount += 4;
      if (isfmt(byte4, 0)) {// 包含fmt段
        fis.read(byte4);
        int factlen = bytearraytoint(byte4);
        fis.read(buffer, 0, factlen);
        fis.read(byte4);// data
        readcount += 8 + factlen;
      }
      fis.read(byte4);// data size
      int datalen = bytearraytoint(byte4);
      header.datasize = datalen;
      header.datasizeoffset = readcount;
      readcount += 4;
      header.dataoffset = readcount;
      header.datainputstream = fis;
      return header;
  }
  private static boolean isriff(byte[] bytes, int start) {
    if (bytes[start + 0] == 'r' && bytes[start + 1] == 'i' && bytes[start + 2] == 'f' && bytes[start + 3] == 'f') {
      return true;
    } else {
      return false;
    }
  }
  private static boolean isfmt(byte[] bytes, int start) {
    if (bytes[start + 0] == 'f' && bytes[start + 1] == 'm' && bytes[start + 2] == 't' && bytes[start + 3] == ' ') {
      return true;
    } else {
      return false;
    }
  }
  private static boolean isdata(byte[] bytes, int start) {
    if (bytes[start + 0] == 'd' && bytes[start + 1] == 'a' && bytes[start + 2] == 't' && bytes[start + 3] == 'a') {
      return true;
    } else {
      return false;
    }
  }
  /**
   * 将int转化为byte[]
   */
  private static byte[] inttobytearray(int data) {
    return bytebuffer.allocate(4).order(byteorder.little_endian).putint(data).array();
  }
  /**
   * 将short转化为byte[]
   */
  private static byte[] shorttobytearray(short data) {
    return bytebuffer.allocate(2).order(byteorder.little_endian).putshort(data).array();
  }
  /**
   * 将byte[]转化为short
   */
  private static short bytearraytoshort(byte[] b) {
    return bytebuffer.wrap(b).order(byteorder.little_endian).getshort();
  }
  /**
   * 将byte[]转化为int
   */
  private static int bytearraytoint(byte[] b) {
    return bytebuffer.wrap(b).order(byteorder.little_endian).getint();
  }
  /**
   * 头部部分信息
   */
  static class header {
    public int filesize;
    public int filesizeoffset;
    public int datasize;
    public int datasizeoffset;
    public int dataoffset;
    public fileinputstream datainputstream;
  }
}

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希望本文所述对大家java程序设计有所帮助。