纯java代码对音频采样率进行转换

转换成16KHz采样率

    void reSampling(byte[] data) throws IOException, UnsupportedAudioFileException {
        WaveFileReader reader = new WaveFileReader();
        AudioInputStream audioIn = reader.getAudioInputStream(new ByteArrayInputStream(data));

        AudioFormat srcFormat = audioIn.getFormat();
        int targetSampleRate = 16000;

        AudioFormat dstFormat = new AudioFormat(srcFormat.getEncoding(),
                targetSampleRate,
                srcFormat.getSampleSizeInBits(),
                srcFormat.getChannels(),
                srcFormat.getFrameSize(),
                srcFormat.getFrameRate(),
                srcFormat.isBigEndian());

        System.out.println(audioIn.getFrameLength());
        AudioInputStream convertedIn = AudioSystem.getAudioInputStream(dstFormat, audioIn);


        String fileName = System.getenv("TEMP").concat(File.separator).concat(System.currentTimeMillis()+".wav");
        File file= new File(fileName);
        WaveFileWriter writer = new WaveFileWriter();
        writer.write(convertedIn, AudioFileFormat.Type.WAVE, file);
}

使用方法：

 byte[] bytes = Files.readAllBytes(Paths.get("e:\\asset\\nZLWKJjQ.wav"));

参考来源：

https://stackoverflow.com/questions/15410725/java-resample-wav-soundfile-without-third-party-library

 https://www.codota.com/web/assistant/code/rs/5c7689a149efcb00014e68b2#L54

笔者一直想把重采样率的数据放在内存中，以二进制数据方式进行交互，也就是不使用磁盘作为交互，返回byte[]。暂时没想到办法