Java mp3文件转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;
/**
* 音频转换工具类
*
*/
public class AudioUtils {
/**
* MP3转换PCM文件方法
*
* @param mp3filepath 原始文件路径
* @param pcmfilepath 转换文件的保存路径
* @return
* @throws Exception
*/
public static boolean convertMP32Pcm(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;
}
}
/**
* 机能概要:获取文件的音频流
* @param mp3filepath
* @return
*/
private static AudioInputStream getPcmAudioInputStream(String mp3filepath) {
File mp3 = new File(mp3filepath);
AudioInputStream audioInputStream = null;
AudioFormat targetFormat = null;
try {
AudioInputStream in = null;
//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() * 2, baseFormat.getSampleRate(), false);
//输出到音频
audioInputStream = AudioSystem.getAudioInputStream(targetFormat, in);
} catch (Exception e) {
e.printStackTrace();
}
return audioInputStream;
}
}
