java - 我需要将音频文件从 μ-law 转换为 PCM

Question

我需要将 wav 文件从 FORMAT 1 转换为 FORMAT 2

格式 1:μ-law，8000Hz，64 kbps，单声道

格式 2:容器WAV编码PCM评分 16K样本格式 16 位 channel 单声道

以下是代码片段:

File file = new File("audio_before_conversion.wav");
AudioFormat audioFormat = new AudioFormat(16000, 16, 1, true , true);
AudioInputStream audioInputStream1 = new AudioInputStream(
     new FileInputStream(file), audioFormat, numFrames);
AudioSystem.write(audioInputStream1, Type.WAVE, 
     new File("audio_after_conversion.wav"));

问题:但是，这不起作用。它会播放一些噪音并减少我的音频文件长度。

编辑 1:mu-Law 到 μ-law

Answer 1

以下代码对我有用--

File sourceFile = new File("<Source_Path>.wav");

        File targetFile = new File("<Destination_Path>.wav");

        AudioInputStream sourceAudioInputStream = AudioSystem.getAudioInputStream(sourceFile);


        AudioInputStream targetAudioInputStream=AudioSystem.getAudioInputStream(AudioFormat.Encoding.PCM_SIGNED, sourceAudioInputStream);
        System.out.println("Sample Rate1 "+targetAudioInputStream.getFormat().getFrameRate());
    AudioFormat targetFormat = new AudioFormat(new AudioFormat.Encoding("PCM_SIGNED"), 16000, 16, 1, 2, 8000, false);



        AudioInputStream targetAudioInputStream1 = AudioSystem.getAudioInputStream(targetFormat, targetAudioInputStream);
        System.out.println("Sample Rate "+targetAudioInputStream1.getFormat().getFrameRate());

        try {
            AudioSystem.write(targetAudioInputStream1, AudioFileFormat.Type.WAVE, targetFile);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }