java——MP3转wav

转载地址

​​java 下mp3 转 wav​​

相对原文有改动。

注：MP3转wav并不会提升源文件的音质。

Maven

<dependency>
<groupId>com.googlecode.soundlibs</groupId>
<artifactId>mp3spi</artifactId>
<version>1.9.5.4</version>
</dependency>

示例

import javazoom.spi.mpeg.sampled.file.MpegAudioFileReader;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class Test2 {

public static AudioFormat targetFormat = null;



/**
* mp3转pcm(8k 16bit)
* @param mp3filepath
* @param pcmfilepath
* @return
*/
public static boolean Mp3ToPcm(String mp3filepath, String pcmfilepath){
try {
//获取文件的音频流，pcm的格式
AudioInputStream audioInputStream = getPcmAudioInputStream(mp3filepath);
//将音频转化为  pcm的格式保存下来
AudioSystem.write(audioInputStream, AudioFileFormat.Type.WAVE, new File(pcmfilepath));
return true;
        } catch (IOException e) {
e.printStackTrace();
return false;
        }
    }

/**
* 获取MP3音频流
* @param mp3filepath
* @return
*/
private static AudioInputStream getPcmAudioInputStream(String mp3filepath) {
File mp3 = new File(mp3filepath);
AudioInputStream audioInputStream = null;

try {
AudioInputStream in = null;
//读取音频文件的类
MpegAudioFileReader mp = new MpegAudioFileReader();
in = mp.getAudioInputStream(mp3);
AudioFormat baseFormat = in.getFormat();
//设定输出格式为pcm格式的音频文件
targetFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16,
baseFormat.getChannels(), baseFormat.getChannels()*16/8, baseFormat.getFrameRate(), false);
//输出到音频
audioInputStream = AudioSystem.getAudioInputStream(targetFormat, in);
        } catch (Exception e) {
e.printStackTrace();
        }
return audioInputStream;
    }
/**
* pcm(8k 16bit)转wav(16k 16bit)
* @param pcmfilepath
* @param wavfilepath
* @throws IOException
*/
public static void pcmToWav(String pcmfilepath,String wavfilepath) throws IOException {
FileInputStream fis = new FileInputStream(pcmfilepath);
byte channels = (byte) targetFormat.getChannels();
int sampleRate = (int) targetFormat.getSampleRate();
int byteRate = targetFormat.getFrameSize()*sampleRate*channels/8;
int datalen = (int)fis.getChannel().size();
ByteBuffer bb = ByteBuffer.allocate(44);
bb.order(ByteOrder.LITTLE_ENDIAN);
bb.put(new byte[] {'R','I','F','F'});//RIFF标记
bb.putInt(datalen+44-8);//原始数据长度（不包含RIFF和本字段共8个字节）
bb.put(new byte[] {'W','A','V','E'});//WAVE标记
bb.put(new byte[] {'f','m','t',' '});//fmt标记
bb.putInt(16);//“fmt”字段的长度，存储该子块的字节数（不含前面的Subchunk1ID和Subchunk1Size这8个字节）
bb.putShort((short)1);//存储音频文件的编码格式，PCM其存储值为1
bb.putShort((short) targetFormat.getChannels());//通道数，单通道(Mono)值为1，双通道(Stereo)值为2
//采样率
bb.putInt(sampleRate);
//音频数据传送速率,采样率*通道数*采样深度/8。(每秒存储的bit数，其值=SampleRate * NumChannels * BitsPerSample/8)
bb.putInt(byteRate);
//块对齐/帧大小，NumChannels * BitsPerSample/8
bb.putShort((short)(targetFormat.getChannels()*16/8));
//pcm数据位数，一般为8,16,32等
bb.putShort((short)16);
bb.put(new byte[] {'d','a','t','a'});//data标记
bb.putInt(datalen);//data数据长度
byte[] header = bb.array();
//wav头
//        for(int i=0;i<header.length;i++) {
//            System.out.printf("%02x ",header[i]);
//        }
ByteBuffer wavbuff = ByteBuffer.allocate(44+datalen);
wavbuff.put(header);
byte[] temp = new byte[datalen];
fis.read(temp);
wavbuff.put(temp);
byte[] wavbytes = wavbuff.array();
FileOutputStream fos = new FileOutputStream(wavfilepath);
fos.write(wavbytes);
fos.flush();
fos.close();
fis.close();
System.out.println("end");
    }

public static void main(String[] args) throws IOException {
String mp3filepath = "C:\\Users\\Administrator\\Music\\等什么君 - 归寻.mp3";//mp3文件路径
String pcmfilepath = "C:\\Users\\Administrator\\Music\\等什么君 - 归寻.pcm";//转化后的pcm路径
String wavfilepath = "C:\\Users\\Administrator\\Music\\等什么君 - 归寻.wav";//转化后的wav路径
Mp3ToPcm(mp3filepath,pcmfilepath);
pcmToWav(pcmfilepath,wavfilepath);
    }
}