纯java代码对音频采样率进行转换

转换成16KHz采样率(含文件头）

    void reSamplingAndSave(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());

        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"));

重采样，不保留文件头（通常用于语音识别）：

    byte[] reSampling(byte[] data) throws IOException, UnsupportedAudioFileException {

        AudioInputStream audioIn = AudioSystem.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());

        AudioInputStream convertedIn = AudioSystem.getAudioInputStream(dstFormat, audioIn);

        int numReads = -1;

        int BUFF_SIZE = targetSampleRate/2;

        byte [] buff = new byte[BUFF_SIZE];

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        while ((numReads = convertedIn.read(buff)) !=-1)

        {

            System.out.println("读入字节数:"+ numReads);

            outputStream.write(buff);

        }

       return outputStream.toByteArray();

    }

重采样2（不含文件头）：

public static final int SAMPLE_RATE = 16000;

// 16-bit audio

private static final int BYTES_PER_SAMPLE = 2;

// 16-bit audio

private static final int BITS_PER_SAMPLE = 16;

private static final double MAX_16_BIT = 32768;

private static final int SAMPLE_BUFFER_SIZE = 4096;

private static final int MONO   = 1;

private static final int STEREO = 2;

private static final boolean LITTLE_ENDIAN = false;

private static final boolean BIG_ENDIAN    = true;

private static final boolean SIGNED        = true;

private static final boolean UNSIGNED      = false;

private static AudioFormat dstFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,

        SAMPLE_RATE,

        BITS_PER_SAMPLE,

        MONO,

        BYTES_PER_SAMPLE,

        8000,

        LITTLE_ENDIAN);

public static byte[] reSamplingPCM(byte[] data) {

    try(AudioInputStream audioIn = AudioSystem.getAudioInputStream(new ByteArrayInputStream(data));

        AudioInputStream convertedStream = AudioSystem.getAudioInputStream(dstFormat, audioIn);

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {

        if (audioIn.getFormat().matches(dstFormat)) {

            return data;

        }

        int numReads = -1;

        int BUFF_SIZE = SAMPLE_RATE / 2;

        byte[] buff = new byte[BUFF_SIZE];

        while ((numReads = convertedStream.read(buff)) != -1) {

            log.info("read {} byte(s)", numReads);

            outputStream.write(buff);

        }

        return outputStream.toByteArray();

    } catch (UnsupportedAudioFileException |IOException e) {

        log.error("occurs errors when re-sampling the audio stream:{}",e);

        throw new RuntimeException("occurs errors when re-sampling the audio stream:{}",e);

    }

}

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