Java mp3 to wav small micro-channel voice recognition programs use Baidu incompatibilities

Write Time: June 30, 2019 16:02:37

Micro-channel recording format to solve the problem of small programs do not meet the tastes of Baidu voice recognition

/**
 * @param inputStream 微信上传的mp3InputSteam：voice.getInputStream()
 * @return pcmBytes
 * @throws Exception Exception
 */
public static byte[] mp3ToPcm(InputStream inputStream) throws Exception {

    BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
    AudioInputStream    mp3                 = AudioSystem.getAudioInputStream(bufferedInputStream);

    AudioFormat mp3Format = mp3.getFormat();
    AudioFormat pcmFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, mp3Format.getSampleRate(), 16,
            mp3Format.getChannels(), mp3Format.getChannels() * 2, mp3Format.getSampleRate(), false);


    AudioInputStream    pcm                 = AudioSystem.getAudioInputStream(pcmFormat, mp3);
    byte[]              pcmBytes            = IOUtils.toByteArray(pcm);
    bufferedInputStream.close();
    mp3.close();
    pcm.close();
    return pcmBytes;

}

Dependent jar package

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.6</version>
</dependency>
<dependency>
    <groupId>com.googlecode.soundlibs</groupId>
    <artifactId>mp3spi</artifactId>
    <version>1.9.5.4</version>
</dependency>

If the message could not get audio input stream from input stream, it may be because the problem is micro-channel developer tools, the use of real machine debugging on it

Micro-channel recording settings, depending on the version may change specific settings refer to the official document:

        const options = {
            duration: 2000,
            sampleRate: 16000,
            numberOfChannels: 1,
            encodeBitRate: 96000,
            format: 'mp3',
            frameSize: 50
        }