Java mp3文件轉pcm文件package cn.zpy.util;

import java.io.File;

import java.io.IOException;

import javax.sound.sampled.AudioFileFormat;

import javax.sound.sampled.AudioFormat;

import javax.sound.sampled.AudioInputStream;

import javax.sound.sampled.AudioSystem;

import javazoom.spi.mpeg.sampled.file.MpegAudioFileReader;

/**

* 音頻轉換工具類

*

*/

public class AudioUtils {

/**

* MP3轉換PCM文件方法

*

* @param mp3filepath 原始文件路徑

* @param pcmfilepath 轉換文件的保存路徑

* @return

* @throws Exception

*/

public static boolean convertMP32Pcm(String mp3filepath, String pcmfilepath){

try {

//獲取文件的音頻流，pcm的格式

AudioInputStream audioInputStream = getPcmAudioInputStream(mp3filepath);

//將音頻轉化為 pcm的格式保存下來

AudioSystem.write(audioInputStream, AudioFileFormat.Type.WAVE, new File(pcmfilepath));

return true;

} catch (IOException e) {

e.printStackTrace();

return false;

}

}

/**

* 機能概要:獲取文件的音頻流

* @param mp3filepath

* @return

*/

private static AudioInputStream getPcmAudioInputStream(String mp3filepath) {

File mp3 = new File(mp3filepath);

AudioInputStream audioInputStream = null;

AudioFormat targetFormat = null;

try {

AudioInputStream in = null;

//讀取音頻文件的類

MpegAudioFileReader mp = new MpegAudioFileReader();

in = mp.getAudioInputStream(mp3);

AudioFormat baseFormat = in.getFormat();

//設定輸出格式為pcm格式的音頻文件

targetFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16,

baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false);

//輸出到音頻

audioInputStream = AudioSystem.getAudioInputStream(targetFormat, in);

} catch (Exception e) {

e.printStackTrace();

}

return audioInputStream;

}

}