音频 .MP3 - > PEM

private static AudioInputStream getPcmAudioInputStream(String mp3filepath) {
		File mp3 = new File(mp3filepath);
		AudioInputStream audioInputStream = null;
		AudioFormat targetFormat = null;
		try {
			AudioInputStream in = null;
			MpegAudioFileReader mp = new MpegAudioFileReader();
			in = mp.getAudioInputStream(mp3);
			AudioFormat baseFormat = in.getFormat();
			targetFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16,
					baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false);
			audioInputStream = AudioSystem.getAudioInputStream(targetFormat, in);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return audioInputStream;
	}



public 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) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}
	}

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